EP0416063B1 - Bag with handles cut out from a reinforced region, process and installation for the production of such bag - Google Patents

Bag with handles cut out from a reinforced region, process and installation for the production of such bag Download PDF

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Publication number
EP0416063B1
EP0416063B1 EP90904193A EP90904193A EP0416063B1 EP 0416063 B1 EP0416063 B1 EP 0416063B1 EP 90904193 A EP90904193 A EP 90904193A EP 90904193 A EP90904193 A EP 90904193A EP 0416063 B1 EP0416063 B1 EP 0416063B1
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EP
European Patent Office
Prior art keywords
ribbon
bag
turning
strengthening
wall
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Expired - Lifetime
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EP90904193A
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German (de)
French (fr)
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EP0416063A1 (en
Inventor
Albert Cornelis
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/06—Handles
    • B65D33/08—Hand holes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/02—Local reinforcements or stiffening inserts, e.g. wires, strings, strips or frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/86—Forming integral handles or mounting separate handles
    • B31B70/876—Forming integral handles or mounting separate handles involving application of reinforcement strips or patches; involving reinforcements obtained by folding

Definitions

  • the present invention relates to a heat-sealable plastic bag, each of the two walls of which is provided, in an area close to the opening of said bag, with at least one cutout serving as a handle, each of said walls having in this area a reinforcement constituted , on the one hand, by a fold folded over the wall and forming one of the edges of the opening of the bag, this fold being arranged so that its free edge is located between said cutout and the bottom of the bag and, on the other hand , by a reinforcement formed by a portion of flat material associated with the bag between said fold and the aforementioned wall, the position and the dimensions of the reinforcement being such that the aforementioned cutout is located entirely in this reinforcement, the fold folded over the wall being fixed , by welding or gluing, to the latter along its free edge.
  • the object of the present invention is to provide a bag of which a double reinforcement of each wall is limited to the place cutting, this reinforcement can be easily adapted to the conditions of use of the bag.
  • the aforementioned reinforcement is assembled, on at least a large part of its surface and in its zone surrounding the cut, either on the face of the folded fold turned towards the corresponding wall, or on this wall opposite said fold, the folded fold being fixed to the corresponding wall over a distance at least equal to the dimension of the cut taken parallel to the bottom of the bag.
  • the fold is folded over the internal face of the wall of the corresponding bag when the reinforcement is assembled to the above-mentioned face of the fold.
  • the invention also relates to a method of manufacturing the above bag.
  • the method consists, either in a bag already formed, or in a bag being formed, to present, near the free edges of the walls of the bag arranged flat, a pair of said reinforcements, to be fixed simultaneously , by gluing or welding and on at least a large part of its surface, a reinforcement to each wall, to simultaneously form the aforementioned fold on each wall of the bag, to simultaneously fold the pleats on their corresponding wall so that each reinforcement is located, on at least a large part of its surface, between the wall and the corresponding folded fold, to simultaneously fix the aforementioned free edges of the folds folded to their corresponding wall, over a distance at least equal to the dimension of the abovementioned cutouts taken parallel to the bottom of the bag and to practice simultaneously said cuts in the two walls of the bag, in their reinforcement zone formed by the wall, the reinforcement and the fold folded over the wall.
  • the invention also relates to an installation for the above-mentioned implementation.
  • the installation comprises means for presenting, either in an already formed bag or in a bag being formed, a pair of reinforcements near the free edges of the walls of the bag arranged flat, means arranged to fix , by gluing or welding and over a large part of its surface, a reinforcement of each pair to a wall, means for forming a fold along the aforementioned free edge of each wall, means for folding this fold over the corresponding wall so that each reinforcement is located between the wall and this folded fold, means for fixing this fold to the corresponding wall, means for making a cut in the area of each of the two walls, reinforced by the above folded fold and the aforementioned reinforcement.
  • Comparative tensile strength tests were carried out on bags according to the invention and on known bags, the reinforcement of which consists of a rectangular reinforcement of heat-weldable material welded to the internal face of each wall at the location of the cut.
  • the known bags withstood a load of 229 N before tearing at the place of cutting while the bags according to the invention withstood, under identical test conditions, a load of 300 N or 31% higher than that supported by the known bag.
  • Figure 1 is a perspective view of a bag according to the invention, the folds of the edge are folded over the inner walls, the handles are completely cut.
  • FIGS 2 to 6 are schematic views and to another scale of sections of the reinforcement zone, this one having respectively the following particularities.
  • Figure 2 shows the folds folded over the outer faces of the corresponding walls of the bag, the reinforcements are fixed on these folds.
  • Figure 3 shows the folds folded over the outer faces of the corresponding walls of the bag, the reinforcements are fixed on these outer faces.
  • Figure 4 shows the folds folded over the inner faces of the corresponding walls of the bag, the reinforcements are fixed on these folds.
  • FIG. 5 shows the folds folded over the internal faces of the corresponding walls of the bag, the reinforcements are fixed on these internal faces.
  • FIG. 6 shows the folds folded over the internal faces of the corresponding walls of the bag, the reinforcements are fixed to the walls and to the folds.
  • FIG. 7 shows the folds folded over the internal faces of the corresponding walls of the bag, the reinforcements are fixed on these folds, they are still fixed to the folds and to the walls by the welds which fix these elements to one another.
  • FIG. 8 shows the folds folded over the external faces of the corresponding walls of the bag, the reinforcements are fixed on these external faces, they are still fixed to the folds and to the walls by the welds which fix these elements to one another.
  • FIGS 9 to 11 are front views, on another scale, of bags produced according to the invention, these figures show different forms of cutouts of handles.
  • FIG. 9 shows a weld for fixing the fold to the wall, of rounded shape at the lateral ends of the bag, the cutout of handles is of the semi-carried type.
  • FIG. 10 shows three welds for fixing the fold to the wall: the first being located under the reinforcement, and having a length equal to the corresponding dimension of the cut, the other two being arranged on either side of the cut and are transverse to the edge of the bag opening, the cutout being of the completely washed-out type.
  • Figure 11 shows a binding of the fold folded over the wall by a weld extending from one to the other of the edges of the bag which are contiguous at the bottom and by two welds perpendicular to the edge of the opening of the bag, the cutout being of the inverted semi-carried type.
  • Figure 12 shows a bag according to the invention, provided with lateral welds, the bottom consisting of a fold.
  • Figure 13 shows a section of the bag shown in Figure 12.
  • Figure 14 shows a bag according to the invention, having lateral welds, the bottom being provided with a bellows.
  • Figure 15 is a section of the bag shown in Figure 14.
  • FIG. 16 represents a bag according to the invention, having general characteristics similar to those of the bag illustrated in FIG. 12 except that the reinforcements and the cutout serving as a handle are offset with respect to the vertical axis of the bag.
  • Figure 17 is a schematic elevational view which illustrates the above process and shows the installation for the implementation thereof.
  • FIG. 18 is a plan view corresponding to FIG. 17.
  • Figure 19 is a schematic illustration of the method according to a particular embodiment.
  • Figure 20 is a schematic illustration of the method according to an advantageous embodiment.
  • Figure 21 is a schematic illustration of the method according to a particularly advantageous embodiment.
  • the bag 1 consists of a heat-sealable plastic, and in particular of polyethylene.
  • This bag has in each of its two walls 2 a zone 3, close to its opening 4, in which a cutout 5 is formed forming a handle.
  • This handle cutout can be, among other things, of the semi-carried type or completely cut out.
  • this is reinforced, on the one hand, by a fold 6 folded over the wall 2 to form one of the edges 7 of the opening 4 of the bag 1, the edge free 8 of the fold being disposed on the other side of the cutout 5 that the edge 7 of the opening of the bag, and, on the other hand, by a reinforcement 9 produced for example from a portion of flat material, advantageously cut in the shape of a rectangle.
  • This reinforcement 9 is associated with the bag, in a manner which will be described later, in order to be disposed between the fold 6 folded over the wall 2 and the latter.
  • the dimensions of this reinforcement are greater than the corresponding dimensions of the contour 10 of the cutout 5 forming the handle and the position of the reinforcement is determined so that the cutout 5 is entirely located there.
  • the invention provides that the fold 6 folded over the wall is fixed, in 10 'to the latter at least along its free edge 8, facing the cutout 5, over a distance at least equal to the dimension of this cut taken parallel to the bottom 14 of the bag.
  • the reinforcement 9, associated with the bag and located between the fold folded over the wall 2 and the latter will be fixed, as the case may be, to the fold 6 ( Figures 2, 4 and 7) or to the wall 2 ( Figures 3, 5 and 8 ). It can also (FIG. 6) have a larger dimension than in the preceding figures and be fixed to the fold 6 and to the wall 2 and then folded up during the formation of the fold 6, this in order to obtain an even greater reinforcement.
  • the reinforcement 9 is constituted by a heat-sealable material compatible with the material constituting the walls 2 and the folds 6, it can advantageously be welded to the wall and / or to the fold. Because, on the one hand, this weld is applied to a large surface of the reinforcement 9 and that, on the other hand, the reinforcement and the wall 2 or the fold 6 do not have the same thickness and possibly do not consist by the same material, the wall gathered at the place of this weld. To hide the phenomenon, we choose the arrangement of Figure 3 for which the reinforcement 9, being attached to the wall 2 of the bag, the weld mark is hidden inside the bag.
  • the fixing of the fold 6 to the wall 2 is usually carried out by a weld 13, the latter consisting either of weld points or advantageously in a weld line. This does not cause significant deformation of the wall because the weld 13 combines two materials (wall and fold) identical from the point of view of their characteristics and their thicknesses.
  • This weld 13 will preferably be arranged parallel to the free edge 8 of the fold, the latter normally being cut straight along a parallel to the bottom 14 of the bag.
  • the reinforcement 9 consists partly of a material such as cardboard and partly of a heat-sealable material or entirely of a heat-sealable material compatible with the heat-sealable material of the fold 6 or of the wall 2.
  • the reinforcement having a sufficient dimension B and being suitably arranged, can be joined, in its heat-sealable part, to the wall 2 and to the fold 6 by the weld 13 fixing the fold to the wall 2 (FIGS. 7 and 8) . This is added to the aforementioned fixing of the reinforcement to the wall or to the fold to ensure greater solidity of the reinforcement zone.
  • the reinforcement 9 (FIGS. 2 to 5) will have a dimension B, taken perpendicular to the edge 7 of the opening of the bag, less than the distance taken between said edge 7 and the weld 13.
  • the reinforcement 9 may be fixed to the wall 2 or to the fold 6 of the reinforcement zone 3 so as to be located away from the weld 13.
  • the weld 13 extends from one edge 17 to the other of the bag, it is easier to produce since it combines from one end to the other the same two materials (fold 6 and wall 2) whose thicknesses are generally constant.
  • bags 1 there are inter alia bags called bags with lateral welds ( Figures 12, 14 and 16). These latter bags are produced from a sheet of plastic material folded in half, the fold 13 'thus obtained forms the bottom 14 of the bag (FIG. 13).
  • the two walls 2 constituted by a portion of the plastic sheet are fixed to each other, along each of their edges 17 contiguous to the bottom 14 formed by the fold 13 ', by a weld 18 well known from the skilled person.
  • the welds 16 transverse or perpendicular to the edge 7 of the opening 4 are advantageously produced by the lateral welds 18 of the bag.
  • the welds 16 may however complement these lateral welds 18, and be located between the latter and the handle cutout 5.
  • the bottom 14 of the bag 1 can be formed by a fold 13 'as already mentioned above, it can however be formed by several folds 19 so as to present a bellows 20 (FIG. 15) which, when unfolded, allows to put the bag upright to facilitate the introduction of the objects to put in it.
  • the cutout 5 serving as a handle for the bags 1 is placed at equal distance from the edges 17 contiguous to the bottom 14 of the bag, the reinforcement also being practically at equal distance from these edges 17.
  • each wall 2 is deliberately offset so as to be closer to one of the edges 17 (FIG. 16). This makes it possible to transport objects protruding from the bag along the edge 17 opposite the first cited edge.
  • the bag according to FIG. 1 can be a bag, the bottom of which is formed by a weld connecting the two walls 2, the lateral edges 17 being constituted by the folds joining the two walls 2 and obtained for example by extrusion and blowing of the plastic material.
  • the bags shown in Figures 9 to 11 are models that can also be applied to bottom weld bags. The side edges of these bottom welded bags have bellows in an advantageous embodiment of the bag according to the invention.
  • the invention provides ( Figures 17 and 18) a method of manufacturing the bag 1 described above. This process applies either in the case of a bag already formed or for a bag in the process of being formed, regardless of whether the bag has a bottom weld or lateral welds.
  • the method consists, in order to reinforce the zone 3 of each wall 2 where a cutout 5 serving as a handle is practiced, to present at 55 a pair of reinforcements 9, which have already been defined above, near the edges free 21 ( Figure 19) of the walls of the bag arranged flat, the method of manufacturing said reinforcements 9 being known per se.
  • a reinforcement 9 of the pair is simultaneously fixed to each corresponding wall 2 of the bag so as to be associated with this wall 2 to occupy the position provided between the folded fold 6 below and the wall 2.
  • This fixing can be obtained by gluing of the reinforcement 9 to the wall 2 or, if the reinforcement 9 consists of a heat-sealable plastic material compatible with the material of the bag, it can be welded to this wall 2 over a large part of its surface. Then the above fold 6 is formed simultaneously at 57 along the free edge 21 of each wall 2 and the two folds 6 are folded simultaneously at 58 'on their corresponding wall 2. These two folds 6 can be folded down either on the external face 11 of their corresponding wall 2 or on the internal face 12 of the latter. One could also if necessary fold down one of the two folds on the external face 11 and the other on the internal face 12 of their corresponding wall 2.
  • each reinforcement 9 is located, on at least a large part of its surface, between the wall 2 and the corresponding fold 6.
  • Each of the folded folds 6 is fixed simultaneously (at 59) to the corresponding wall 2 over a distance at least equal to the size of the cutouts 5, forming the handles, taken parallel to the bottom of the bag, this fixing being done along the free edge 8 of the fold 6, opposite said cut 5, between the latter and the free edge 8 of the folded fold.
  • This fixing will advantageously consist of a weld 13. According to the dimensions and the relative positions of the folds and the reinforcements, the fold 6 is thus welded to the corresponding wall 2 to obtain a bag according to one of FIGS.
  • the reinforcement 9 is welded to the fold 6 and to the wall 2 in the zone of said reinforcement (FIGS. 7 and 8) and optionally outside this zone, the folded fold 6 is welded to the corresponding wall 2.
  • the cutouts 5 serving as handles are practiced in the reinforcement zone 3 of each of the two walls 2 thus formed and comprising the wall 2, the reinforcement 9 and the folded fold 6 on the wall 2.
  • the method more especially comprises the following operations integrated in the course of the formation of said bag 1.
  • a plastic tape 51 consisting of two thicknesses 52 (Figure 19) superimposed which are joined by a fold 53 forming one of the longitudinal edges of the ribbon, this fold 53 being intended to constitute the funds 14 of the bags.
  • This ribbon 51 can be obtained in different ways. We can take a single thickness material that we fold in half. One can also use a ribbon made up of two thicknesses 52, linked together by a fold along each of the edges of these two thicknesses.
  • Such a tape is obtained by extrusion, blowing and winding after flattening the hose thus formed for plastics such as polyethylene.
  • one of the two folds formed during the flattening of the hose is cut to serve as an opening to the bag while the second fold 53 is kept to constitute the bottoms 14 of the bags.
  • Each step of the aforementioned step-by-step movement corresponds to the dimension L of a bag to be produced, this dimension being taken parallel to the above fold 53 forming the bottom 14 of the bag.
  • This step-by-step movement makes it possible to carry out operations during a cyclic stopping time of the ribbon 51.
  • the two thicknesses forming the ribbon are separated at 54 from one another.
  • This reinforcement 9 can be fixed either using of an adhesive either by means of a weld, made over a large part of its surface. Bonding is preferably done by coating the fixing face of the reinforcement 9, using a product or a mixture of products which becomes adhesive after a drying time, and possibly reheating to activate this drying.
  • the fixing being carried out, the strip of material 51 is given at 56 a continuous movement along its longitudinal axis and in the same direction as the above-mentioned stepwise movement.
  • a fold 6 is formed at 57 along each free edge 52 ′ of the thicknesses 52 of said strip 51, the dimension C of this fold, taken perpendicular to the longitudinal axis of the ribbon, being greater than the distance which separates the most distant edge, 58 from a reinforcement of the free edge 52 'of the corresponding thickness 52. Then, during this continuous movement of the ribbon 51, the folds 6 formed on the faces of the above-mentioned thicknesses which are turned towards each other and which will constitute the internal faces 12 of the walls of the bag are folded down.
  • the fixing of the folds thus folded down to the corresponding walls can advantageously be carried out by a weld 13. This can be done either at 59, during the continuous movement of the above-mentioned ribbon, or at 60 at each stop of the stepwise movement of this ribbon.
  • a continuous weld will be carried out for example for each wall, by an element 61 elongated in the direction of movement of the ribbon, electrically heated and radiating sufficient heat towards the ribbon in order to melt wall 2 and the fold together. 6 along the free edge 8 of the latter.
  • the continuous movement of the ribbon 51 is first transformed into 62 into a step-by-step movement whose step is equal to that of the aforementioned step-by-step movement and in the same direction and the same direction as those of the movement continued.
  • an element 63 is brought against the fold 6 and the wall 2, arranged parallel to the direction of movement of the ribbon and heated, in order to press the fold one on the other and the wall and melt them together by pressure and heat to weld them along the free edge 8 of the folded fold.
  • the location of the welding 13 on the bag so that it associates only the folded fold 6 with the wall 2 , when this weld 13 is made between the reinforcement 9 and the free edge 8 of the fold (case of the bag in FIG. 4).
  • the weld 13 can also advantageously be located between the cutout 5 and the edge of the reinforcement 9, the closest to the free edge 8 and parallel to it (case of the bag in FIG. 7). In this way, it fixes the reinforcement 9 to the fold 6 and to the wall 2 and, outside said reinforcement 5, it fixes the fold 6 to the wall 2.
  • 64 is practiced cutting 5 serving as a handle, by means of a knife, the control of which will be described below.
  • the two thicknesses 52 are joined at 66 by the action of at least one heated element and arranged perpendicular to the direction of movement of the ribbon 51 and momentarily pressed. against the two thicknesses 52 to make a weld.
  • This weld 18 obtained by heat and pressure produces the contiguous lateral edges 17 of two successive bags 1 during formation. This welding is carried out between two pairs of cuts 5, either at an equal distance from these two pairs of cuts (FIG. 12) or even at unequal distances from these two pairs if it is desired to obtain a bag as illustrated in FIG. figure 16.
  • the bag in formation which is furthest downstream with respect to the direction of movement of the plastic tape is formed by this last welding operation and it is separated from the bag in formation, which is immediately adjacent to it, between its edge lateral 17 and the lateral edge 17 which is contiguous to it and which belongs to the last bag in formation.
  • Another method of manufacturing a bag 1 according to the invention consists, in order to reinforce the bags being formed, in carrying out the same operations as those described above, namely: driving step by step and along its longitudinal axis a ribbon 51 of plastic material formed of two superimposed thicknesses 52 joined by a fold 53 forming one of the longitudinal edges of the ribbon 51 and intended to constitute the bottoms of the bags.
  • Each step still corresponds to the dimension L of the bag to be manufactured.
  • the two thicknesses 52 are moved apart from each other, between these two thicknesses 52 separated, introduced transversely to the longitudinal axis of the ribbon 51, at each step and either when the ribbon is in motion or at a standstill, a pair of reinforcements 9 whose dimension A is less than one step.
  • the weld 13 is then produced, at each stop of the step by step, folds 6 folded over the thicknesses 53 to the latter, parallel to the free edges 8.
  • the weld 13 is advantageously arranged to obtain either a bag according to FIGS. 4 and 5 where the reinforcement 9 is not fixed to the fold 6 and to the wall 2 by this weld 13, or a bag for example according to FIG. 7, for which the reinforcement 9 is fixed to the fold 6 and to the wall 2 by the welding 13. From this step, we find the steps already described in the previous process.
  • the cutting 5 is practiced at 64 at each stop of the ribbon 51.
  • the lateral edges 17 of the bag are formed by a weld at 66 at each stop of the ribbon 51 and a bag 1 is separated formed from the immediately adjacent bag that is being formed.
  • one technique consists in carrying out the weld 13 during each stop of the movement step by step while the cut 5 is made simultaneously in the two thicknesses 52.
  • Another technique consists in making this weld 13 continuously while the ribbon 51 is moved continuously along its longitudinal axis to form the folds 6 and fold them over their corresponding thickness.
  • the bag according to the invention is formed from a ribbon of single-thickness material 70 (FIG. 20 ) that is driven continuously, for example to unwind a coil on which it is stored.
  • This movement is transformed into a step-by-step movement to place the reinforcements 9 at 71 along the two longitudinal edges 52 ′ of the ribbon and to fix them there at each stop of the step-by-step movement then the step-by-step movement of the ribbon 70 in one movement continuous better suited to the following operation which consists in folding in two the single thickness ribbon 70 along its longitudinal axis to obtain a double thickness ribbon.
  • the reinforcements 9 of a pair are communicated a speed substantially equal to the speed of the ribbon 70 so that they move in the same direction and the same direction as this ribbon 70 and the 'is fixed, either by gluing or by welding, the reinforcements 9 of a pair to the simple thickness of material during this common movement.
  • the measurement is repeated to cyclically detect this length.
  • the pairs of reinforcements 9 will be fixed along the edges 52 'so that the reinforcements located along the same edge are equidistant while the reinforcements of the same pair are opposite one another.
  • the folds 6 are formed at 72 so that they have a dimension C, taken perpendicular to the longitudinal axis of the strip 70, which is greater than the distance separating the edge 58 from a reinforcement. from the corresponding free edge 52 '.
  • These folds formed at 73 are folded over the face of the ribbon 70 of simple thickness so that the reinforcements 9 are located between the folds and the corresponding face of the ribbon.
  • the folds are fixed at 74 at the corresponding thickness by a continuous weld, already mentioned above, along their free edges 8.
  • FIG. 20 shows this weld 13 away from the reinforcements 9 but it can also be arranged to weld the reinforcements 9 to the folded fold 6 and to the corresponding thickness of the ribbon 70.
  • the ribbon thus reinforced is folded in half, along its two longitudinal edges, along its longitudinal axis to form the ribbon in double thickness in which the reinforcements of the same pair overlap.
  • the following operations have already been described above, they begin with the production of the cutout 5.
  • the last folding mentioned is done at 71 '.
  • the present invention also provides an installation for implementing the method or one of the methods described above.
  • An installation according to the invention comprises (FIGS. 17 and 18) means known per se consisting for example of a suction and rotating table 75 for presenting either in a bag already formed or in a bag being formed, a pair of reinforcements 9 near the free edges 20 (FIG.
  • means 76 known per se for fixing, for example by welding, a reinforcement 9 of each pair to a wall 2 of the bag, means 77, such as folding rods to form a fold 6 along the aforementioned free edge 20 of each wall, means 78, for example other folding rods, for folding this fold 6 onto the corresponding wall so that each reinforcement 9 is located between wall 2 and this fold 6, means 79 for fixing this fold 6, for example by a weld 13, to the corresponding wall, means 80 for making a cut 5, like a knife driven by an approach movement and bringing them into contact with the walls 2, in their zone reinforced 3, and removal after cutting.
  • the installation described below is provided for making bags with lateral welds and it advantageously comprises, to reinforce the zone 3 of the walls 2, means 81 for animate the ribbon 51 with a translational movement in step by step (for example by a rack or sector system actuated by a device with connecting rod and crank) or continuously (for example by one or more motors with electronic control), means 75 for presenting the reinforcements in pairs, such as the rotary and suction table already mentioned , transversely to said longitudinal axis, along the two free longitudinal edges 52 ′ of the ribbon 51, means 76 for fixing a reinforcement 9 of each pair to said ribbon, along each of its free longitudinal edges 52 ′.
  • This installation also includes means 77 for forming a fold 6 along each. edges 52 'and means 78 for folding this fold 6 over the corresponding wall so that the reinforcements 9 are situated between the folded fold 6 on the wall and the latter.
  • These means 77 and 78 consist, when this folding is done during a continuous movement of the ribbon 51, of folding rods, folding plates and rollers guiding the walls and the folds.
  • means 79 for fixing the folded folds 6 to their corresponding wall, by a continuous weld, during the continuous movement of the ribbon or by an alternative weld if the ribbon is moved step by step means 80 equipped with a knife, the shape of which can be chosen as a function of the form of cutout which it is desired to make for the handles, and means 82 comprising at least one heated element for carrying out, by heat and by pressure, the welding of the lateral edges 17 of the bags in formation perpendicular to the direction of movement of the tape 51 and of the means 82 ′ associated with the means for welding the lateral edges, like a knife housed between two heated elements for welding, and intended to separate a bag shape of a bag in formation.
  • the means 82 for carrying out the welding and the means for carrying out the separation may be only one heated element, arranged perpendicular to the direction of movement of the tape 51, for welding and for separating. These two means for welding the lateral edges and for separating a formed bag are moved back and forth so that they are in contact with the tape 51 at each stop of the latter and so that they deviate from it before the ribbon 51 is set in motion by the step by step.
  • a step given by this training corresponds to the dimension L of the bag to be manufactured.
  • the installation also includes, at 54, means not shown, consisting for example of rods, for spreading the two thicknesses 52 from one another, over a distance greater than the dimension A of the reinforcements, so that the means 75 which introduce the reinforcements 9 between the thicknesses 52 do so without the reinforcements 9 and or the thicknesses 52 interfering and deforming by being pushed one against the other.
  • These latter means 75 consist of a rotary and suction table capable of transporting at least one reinforcement on each of its faces and supplied with reinforcements by a device known per se.
  • the reinforcements being advantageously made of a heat-weldable material
  • means 76 for welding a reinforcement of each pair to the corresponding thickness 52 are associated with the introduction means so that the reinforcement is welded to the wall at each stop of the resulting stepping step tape.
  • These means 76 for fixing by welding comprise a heated element which is pressed against the strip and the reinforcement to melt them together at least along weld lines distributed over a large surface of the reinforcement.
  • means 84 Downstream of these means for welding the reinforcements in the direction of movement of the ribbon 51, means 84, such as motorized drive rollers, are provided to communicate a continuous movement at constant speed to the ribbon 51 and in the same direction as the step by step movement.
  • means 77 form a fold 6 along each free edge 52 'of thicknesses 52 and other means 78 fold these folds 6, formed by means 77 and lined with reinforcements 9, on the faces 12 of thicknesses 52 so that the reinforcements are located between these folds 6 and the corresponding face 12.
  • each of these folds 6 is welded continuously, during the movement continuous of the ribbon 51, by means 85 which consist for example of heated and curved elements 61 each radiating sufficient heat towards a thickness and its associated ply, along a line parallel to the longitudinal axis of the ribbon 51, the thicknesses and their fold being stretched over a passage cylinder 60 'whose diameter matches the radius of bending of the elements 61 to create a determined air gap between an element 61 and a cylinder.
  • This operation is carried out for each of the two plies 6.
  • the ribbon 51 passes by means 85 ′ such as motorized rubberized rollers to impart a step-by-step movement to said ribbon 51.
  • the pitch of this new movement is of the same amplitude than that of the step by step movement described at the beginning of this installation.
  • Means 80 give a movement back and forth to a knife 65 so that it performs cutting 5 when the tape 51 is stopped by the stepwise movement provided by the means 85 'and so that the knife is withdrawn before these means 85 'set the ribbon 51 in motion again to advance it one step.
  • a particularly advantageous embodiment of the installation according to the invention comprises, for the manufacture of bags with lateral welds according to FIGS. 12, 14 and 16, the same means as those defined for the above installation, up to and including including those which fix the reinforcements 9.
  • This other embodiment of the installation therefore comprises the means 83 for driving the ribbon 51 in double thickness step by step, the means not shown for spreading the two thicknesses 52 at 54 from one another, the means 75 for introducing the reinforcements 9 between the thicknesses 52 and the means 76 for welding the reinforcements 9 to the corresponding thickness 52. Downstream of these means for welding the reinforcements 9, the step-by-step movement is preserved, in order to present the strip in double thickness to the means which follow.
  • the ribbon 51 is brought in step by step to means 77 which form a fold along the free edge (52 ′) of the two thicknesses 52 of the ribbon 51.
  • These means can be rods placed on the passage of said free edges in case these folds are formed during the movement of the step by step.
  • These means 77 can be parts marking the fold at the stop of the step by step.
  • Means 78 fold the two folds 6 thus formed over the corresponding thickness 52 either during the movement of the step by step, in case they may consist of rods deforming the edge to fold the fold, or during the stopping of the step at not, for example if these means are pliers which at each stop take the folds to fold them over the corresponding thickness.
  • step by step the ribbon is brought to the means 79 which weld the folds 6 to the thickness corresponding to each stop of the step by step.
  • These means generally consist of two heated elements, each being pressed at each stop of the strip 51, against a fold 6 and the corresponding thickness for welding them and forming the weld 13; the elements are put away from the fold and the thickness before the ribbon is set in motion.
  • the step-by-step movement brings the area for reinforcing the thicknesses 52 of the ribbon 51 to the location of the means 80. From these means 80 for cutting 5 in the reinforcement areas 3, the description is identical to that of the previous installation.
  • FIG. 21 Another particularly advantageous embodiment of the installation comprises (FIG. 21) means for continuously driving, along its longitudinal axis, a ribbon 70 of single thickness, for example wound on a reel not shown.
  • the ribbon 70 is thus brought at 71 opposite known means which have, transversely to said longitudinal axis, pairs of reinforcements, a reinforcement 9 of each pair being disposed near one of the free edges 52 '.
  • Means not shown, such as a meter or a pulse counter and an encoder, are arranged to measure the passage of a length of tape 70 corresponding to the dimension L of a bag, taken parallel to the abovementioned longitudinal axis.
  • these means When these means detect the passage of a length L, on the one hand, they reset to zero to measure a new identical length and, on the other hand, they give each detection, a signal that is used to communicate , at each reinforcement of each pair, a speed equal to the speed of the ribbon 70 in the same direction and in the same direction as the latter by means not shown, for example constituted by rubberized rollers momentarily driven at each signal, and to fix by means not shown each reinforcement to the simple thickness of material.
  • the reinforcement for example being coated with adhesive, will be applied to the tape by these fixing means which may be an applicator and pressure element.
  • These means communicating a speed to the reinforcements 9 and these fixing means are arranged and arranged so that the reinforcements of the same pair are opposite one another.
  • the ribbon being always driven continuously, folds are formed along its two free edges 52 ', at 72, using folding rods arranged on the passage of said free edges. Complementary rods fold at 73 the folds 6 formed on the ribbon 70 in single thickness so that the reinforcements 9 fixed along the free edges are located between their corresponding fold and the simple thickness of material.
  • the ribbon being driven by a continuous movement, a continuous long welding device as already described will advantageously be used to fix at 74 each ply 6 to the simple thickness.
  • this device generally comprises a passage cylinder 60 ′ and a heated and curved element 61 by fold to be welded.
  • a single passage cylinder 60 ′ is sufficient and a heated and curved element 61 is positioned at the location of each of the two fixings, of a fold and of the thickness, to be produced by welding.
  • the folds 6 are fixed by a weld 13 to the thickness 70, the latter is folded in half at 71 'along its longitudinal axis by a device of known range comprising a folding triangle and pinch rollers.
  • the ribbon 70 folded to form a double thickness ribbon 51 is then animated with a step-by-step movement, in the same direction as the above-mentioned continuous movement, by means such as those bearing the reference 85 'in FIG. 17 and which consist of rubberized rollers controlled step by step for example by a sector having a reciprocating movement.
  • This step-by-step movement is used to carry out, at each of its stops, the operations practicing cutting 5, forming the welding of the edges 17 and effecting the separation of a formed bag.
  • the means used for these operations have already been described above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Bag Frames (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)

Abstract

Bag (1) made of heat sealable plastic, each of its walls (2) being provided, in a region (3) near to its opening (4) with at least one cut-out constituting the handle, and having, in the region (3) a reinforcement consisting of a fold (6) turned down on the wall (2) so that its free edge (8) is located between said cut-out segment and the bottom (14) of the bag, and a reinforcing piece (9) associated with the bag between the fold (6) and the wall (2), the cut-out segment (5) being entirely located in the region of the reinforcing piece (9), whereby the turned-down fold (6) is attached to the corresponding wall (2) along its free edge (8), opposite the cut-out segment (5) and over a distance at least equal to the size of said cut-out segment parallel to the bottom of the bag, process for the manufacture of said bag and installation for the implementation of this process.

Description

La présente invention concerne un sac en matière plastique thermosoudable, dont chacune des deux parois est pourvue, dans une zone proche de l'ouverture dudit sac, d'au moins une découpe servant de poignée, chacune desdites parois présentant dans cette zone un renforcement constitué, d'une part, par un pli rabattu sur la paroi et formant un des bords de l'ouverture du sac, ce pli étant agencé pour que son bord libre soit situé entre ladite découpe et le fond du sac et, d'autre part, par un renfort formé par une portion de matériau plat associé au sac entre ledit pli et la paroi précitée, la position et les dimensions du renfort étant telles que la découpe susdite est située entièrement dans ce renfort, le pli rabattu sur la paroi étant fixé, par soudage ou collage, à cette dernière le long de son bord libre.The present invention relates to a heat-sealable plastic bag, each of the two walls of which is provided, in an area close to the opening of said bag, with at least one cutout serving as a handle, each of said walls having in this area a reinforcement constituted , on the one hand, by a fold folded over the wall and forming one of the edges of the opening of the bag, this fold being arranged so that its free edge is located between said cutout and the bottom of the bag and, on the other hand , by a reinforcement formed by a portion of flat material associated with the bag between said fold and the aforementioned wall, the position and the dimensions of the reinforcement being such that the aforementioned cutout is located entirely in this reinforcement, the fold folded over the wall being fixed , by welding or gluing, to the latter along its free edge.

On connaît de nombreux types de sacs avec renforcement de la zone où l'on effectue la découpe servant de poignée. Parmi ces sacs certains présentent un renforcement obtenu par un ou deux plis de la paroi à l'endroit de chaque bord de l'ouverture, ce ou ces plis étant soudés à la paroi correspondante. D'autres ont leurs bords garnis d'un cavalier de renforcement. Une autre catégorie est composée de sacs dont la zone précitée de chaque paroi est doublée par un renfort fixé à l'extérieur ou à l'intérieur du sac, ce renfort étant soit soudé soit collé: voir les renforts soudés ou collés à l'intérieur du sac suivant les figures 1 à 6 de la FR-A-2.052.639 qui montre en outre aux figures 7 à 13 des sacs dont la zone comportant la poignée découpée est renforcée, d'une part, par un pli de la paroi correspondante rabattu à l'intérieur du sac et fixé à cette paroi et, d'autre part, par une bande de matière libre disposée dans l'espace formé entre plis, paroi et fixation du pli à la paroi.Many types of bags are known with reinforcement of the area where the cutting is used as a handle. Among these bags, some have a reinforcement obtained by one or two folds of the wall at the location of each edge of the opening, this or these folds being welded to the corresponding wall. Others have their edges trimmed with a reinforcement jumper. Another category is made up of bags, the aforementioned area of each wall of which is doubled by a reinforcement attached to the outside or inside of the bag, this reinforcement being either welded or glued: see the reinforcements welded or glued inside. of the bag according to FIGS. 1 to 6 of FR-A-2,052,639 which further shows in FIGS. 7 to 13 of bags whose area comprising the cut-out handle is reinforced, on the one hand, by a fold of the corresponding wall folded back inside the bag and fixed to this wall and, on the other hand, by a strip of free material arranged in the space formed between plies, wall and fixing of the ply to the wall.

Le renforcement des sacs précités reste cependant insuffisant si l'on veut qu'ils soient compétitifs au point de vue prix. Si par contre l'on désire un renforcement plus solide, les qualités des matières à mettre en oeuvre et les épaisseurs de parois et/ou du renforcement à réaliser augmentent fortement les coûts de fabrication. De plus, dans beaucoups de cas, le mode de renforcement ou la technique utilisée pour fixer le renforcement abîment l'aspect du sac ainsi réalisé.The strengthening of the aforementioned bags remains insufficient, however, if we want them to be price competitive. If, on the other hand, a more solid reinforcement is desired, the qualities of the materials to be used and the wall thicknesses and / or the reinforcement to be produced greatly increase the manufacturing costs. In addition, in many cases, the method of reinforcement or the technique used to fix the reinforcement spoils the appearance of the bag thus produced.

La présente invention a pour but de procurer un sac dont un double renforcement de chaque paroi est limité à l'endroit de la découpe, ce renforcement peut être facilement adapté aux conditions d'utilisation du sac.The object of the present invention is to provide a bag of which a double reinforcement of each wall is limited to the place cutting, this reinforcement can be easily adapted to the conditions of use of the bag.

A cet effet, suivant l'invention, le renfort précité est assemblé, sur au moins une partie importante de sa surface et dans sa zone entourant la découpe, soit à la face du pli rabattu tournée vers la paroi correspondante, soit sur cette paroi en regard dudit pli, le pli rabattu étant fixé à la paroi correspondante sur une distance au moins égale à la dimension de la découpe prise parallèlement au fond du sac.To this end, according to the invention, the aforementioned reinforcement is assembled, on at least a large part of its surface and in its zone surrounding the cut, either on the face of the folded fold turned towards the corresponding wall, or on this wall opposite said fold, the folded fold being fixed to the corresponding wall over a distance at least equal to the dimension of the cut taken parallel to the bottom of the bag.

Suivant un mode de réalisation de l'invention, le pli est rabattu sur la face interne de la paroi du sac correspondante lorsque le renfort est assemblé à la face susdite du pli.According to one embodiment of the invention, the fold is folded over the internal face of the wall of the corresponding bag when the reinforcement is assembled to the above-mentioned face of the fold.

L'invention a également pour objet un procédé de fabrication du sac susdit.The invention also relates to a method of manufacturing the above bag.

Suivant l'invention, le procédé consiste, soit dans un sac déjà formé, soit dans un sac en cours de formation, à présenter, à proximité des bords libres des parois du sac disposées à plat, une paire de renforts susdits, à fixer simultanément, par collage ou soudage et sur au moins une partie importante de sa surface, un renfort à chaque paroi, à former simultanément le pli précité sur chaque paroi du sac, à rabattre simultanément les plis sur leur paroi correspondante pour que chaque renfort soit situé, sur au moins une partie importante de sa surface, entre la paroi et le pli rabattu correspondant, à fixer simultanément les bords libres précités des plis rabattus à leur paroi correspondante, sur une distance au moins égale à la dimension des découpes précitées prise parallèlement au fond du sac et à pratiquer simultanément lesdites découpes dans les deux parois du sac, dans leur zone de renforcement constituée par la paroi, le renfort et le pli rabattu sur la paroi.According to the invention, the method consists, either in a bag already formed, or in a bag being formed, to present, near the free edges of the walls of the bag arranged flat, a pair of said reinforcements, to be fixed simultaneously , by gluing or welding and on at least a large part of its surface, a reinforcement to each wall, to simultaneously form the aforementioned fold on each wall of the bag, to simultaneously fold the pleats on their corresponding wall so that each reinforcement is located, on at least a large part of its surface, between the wall and the corresponding folded fold, to simultaneously fix the aforementioned free edges of the folds folded to their corresponding wall, over a distance at least equal to the dimension of the abovementioned cutouts taken parallel to the bottom of the bag and to practice simultaneously said cuts in the two walls of the bag, in their reinforcement zone formed by the wall, the reinforcement and the fold folded over the wall.

D'autre part, l'invention a encore pour objet une installation pour la mise en oeuvre susdite.On the other hand, the invention also relates to an installation for the above-mentioned implementation.

Suivant l'invention l'installation comprend des moyens pour présenter, soit dans un sac déjà formé soit dans un sac en cours de formation, une paire de renforts à proximité des bords libres des parois du sac disposées à plat, des moyens agencés pour fixer, par collage ou soudage et sur une partie importante de sa surface, un renfort de chaque paire à une paroi, des moyens pour former un pli le long du bord libre précité de chaque paroi, des moyens pour rabattre ce pli sur la paroi correspondante afin que chaque renfort soit situé entre la paroi et ce pli rabattu, des moyens pour fixer ce pli à la paroi correspondante, des moyens pour pratiquer une découpe dans la zone de chacune des deux parois, renforcée par le pli rabattu susdit et le renfort précité.According to the invention, the installation comprises means for presenting, either in an already formed bag or in a bag being formed, a pair of reinforcements near the free edges of the walls of the bag arranged flat, means arranged to fix , by gluing or welding and over a large part of its surface, a reinforcement of each pair to a wall, means for forming a fold along the aforementioned free edge of each wall, means for folding this fold over the corresponding wall so that each reinforcement is located between the wall and this folded fold, means for fixing this fold to the corresponding wall, means for making a cut in the area of each of the two walls, reinforced by the above folded fold and the aforementioned reinforcement.

Des essais comparatifs de résistance à la traction ont été effectués sur des sacs selon l'invention et sur des sacs connus dont le renforcement consiste en un renfort rectangulaire de matière thermosoudable soudé sur la face interne de chaque paroi à l'endroit de la découpe.Comparative tensile strength tests were carried out on bags according to the invention and on known bags, the reinforcement of which consists of a rectangular reinforcement of heat-weldable material welded to the internal face of each wall at the location of the cut.

Pour des épaisseurs égales de parois et de renforts, les sacs connus ont supporté une charge de 229 N avant de déchirer à l'endroit de la découpe tandis que les sacs suivant l'invention ont résisté, dans des conditions d'essai identiques, à une charge de 300 N soit 31 % supérieure à celle supportée par le sac connu.For equal thicknesses of walls and reinforcements, the known bags withstood a load of 229 N before tearing at the place of cutting while the bags according to the invention withstood, under identical test conditions, a load of 300 N or 31% higher than that supported by the known bag.

D'autres détails et particularités de l'invention ressortiront des revendications secondaires et de la description des dessins annexés au présent mémoire et qui illustrent, à titre d'exemples non limitatifs, le sac, le procédé et des formes de réalisation particulières de l'installation suivant l'invention.Other details and particularities of the invention will emerge from the secondary claims and from the description of the drawings appended to this specification and which illustrate, by way of nonlimiting examples, the bag, the method and particular embodiments of the. installation according to the invention.

La figure 1 est une vue en perspective d'un sac suivant l'invention dont les plis du bord sont rabattus sur les parois internes, les poignées sont complètement découpées.Figure 1 is a perspective view of a bag according to the invention, the folds of the edge are folded over the inner walls, the handles are completely cut.

Les figures 2 à 6 sont des vues schématiques et à une autre échelle de sections de la zone de renforcement, celle-ci présentant respectivement les particularités suivantes.Figures 2 to 6 are schematic views and to another scale of sections of the reinforcement zone, this one having respectively the following particularities.

La figure 2 montre les plis rabattus sur les faces externes des parois correspondantes du sac, les renforts sont fixés sur ces plis.Figure 2 shows the folds folded over the outer faces of the corresponding walls of the bag, the reinforcements are fixed on these folds.

La figure 3 montre les plis rabattus sur les faces externes des parois correspondantes du sac, les renforts sont fixés sur ces faces externes.Figure 3 shows the folds folded over the outer faces of the corresponding walls of the bag, the reinforcements are fixed on these outer faces.

La figure 4 montre les plis rabattus sur les faces internes des parois correspondantes du sac, les renforts sont fixés sur ces plis.Figure 4 shows the folds folded over the inner faces of the corresponding walls of the bag, the reinforcements are fixed on these folds.

La figure 5 montre les plis rabattus sur les faces internes des parois correspondantes du sac, les renforts sont fixés sur ces faces internes.FIG. 5 shows the folds folded over the internal faces of the corresponding walls of the bag, the reinforcements are fixed on these internal faces.

La figure 6 montre les plis rabattus sur les faces internes des parois correspondantes du sac, les renforts sont fixés aux parois et aux plis.FIG. 6 shows the folds folded over the internal faces of the corresponding walls of the bag, the reinforcements are fixed to the walls and to the folds.

La figure 7 montre les plis rabattus sur les faces internes des parois correspondantes du sac, les renforts sont fixés sur ces plis, ils sont encore fixés aux plis et aux parois par les soudures qui fixent l'un à l'autre ces éléments.FIG. 7 shows the folds folded over the internal faces of the corresponding walls of the bag, the reinforcements are fixed on these folds, they are still fixed to the folds and to the walls by the welds which fix these elements to one another.

La figure 8 montre les plis rabattus sur les faces externes des parois correspondantes du sac, les renforts sont fixés sur ces faces externes, ils sont encore fixés aux plis et aux parois par les soudures qui fixent l'un à l'autre ces éléments.FIG. 8 shows the folds folded over the external faces of the corresponding walls of the bag, the reinforcements are fixed on these external faces, they are still fixed to the folds and to the walls by the welds which fix these elements to one another.

Les figures 9 à 11 sont des vues de face, à une autre échelle, de sacs réalisés suivant l'invention, ces figures montrent différentes formes de découpes de poignées.Figures 9 to 11 are front views, on another scale, of bags produced according to the invention, these figures show different forms of cutouts of handles.

La figure 9 présente une soudure de fixation du pli à la paroi, de forme arrondie aux extrémités latérales du sac, la découpe de poignées est du type semi-emportée.FIG. 9 shows a weld for fixing the fold to the wall, of rounded shape at the lateral ends of the bag, the cutout of handles is of the semi-carried type.

La figure 10 présente trois soudures de fixation du pli à la paroi : la première étant située sous le renfort, et présentant une longueur égale à la dimension correspondante de la découpe, les deux autres étant disposées de part et d'autre de la découpe et sont transversales au bord de l'ouverture du sac, la découpe étant du type complètement emportée.FIG. 10 shows three welds for fixing the fold to the wall: the first being located under the reinforcement, and having a length equal to the corresponding dimension of the cut, the other two being arranged on either side of the cut and are transverse to the edge of the bag opening, the cutout being of the completely washed-out type.

La figure 11 présente une fixation du pli rabattu sur la paroi par une soudure s'étendant de l'un à l'autre des bords du sac qui sont contigus au fond et par deux soudures perpendiculaires au bord de l'ouverture du sac, la découpe étant du type semi-emportée inversée.Figure 11 shows a binding of the fold folded over the wall by a weld extending from one to the other of the edges of the bag which are contiguous at the bottom and by two welds perpendicular to the edge of the opening of the bag, the cutout being of the inverted semi-carried type.

La figure 12 présente un sac suivant l'invention, muni de soudures latérales, le fond étant constitué d'un pli.Figure 12 shows a bag according to the invention, provided with lateral welds, the bottom consisting of a fold.

La figure 13 montre une section du sac représenté à la figure 12.Figure 13 shows a section of the bag shown in Figure 12.

La figure 14 représente un sac suivant l'invention, présentant des soudures latérales, le fond étant muni d'un soufflet.Figure 14 shows a bag according to the invention, having lateral welds, the bottom being provided with a bellows.

La figure 15 est une section du sac représenté à la figure 14.Figure 15 is a section of the bag shown in Figure 14.

La figure 16 représente un sac suivant l'invention, ayant des caractéristiques générales semblables à celles du sac illustré à la figure 12 sauf que les renforts et la découpe servant de poignée sont décalés par rapport à l'axe vertical du sac.FIG. 16 represents a bag according to the invention, having general characteristics similar to those of the bag illustrated in FIG. 12 except that the reinforcements and the cutout serving as a handle are offset with respect to the vertical axis of the bag.

La figure 17 est une vue schématique en élévation qui illustre le procédé susdit et montre l'installation pour la mise en oeuvre de celui-ci.Figure 17 is a schematic elevational view which illustrates the above process and shows the installation for the implementation thereof.

La figure 18 est une vue en plan correspondant à la figure 17.FIG. 18 is a plan view corresponding to FIG. 17.

La figure 19 est une illustration schématique du procédé suivant une forme de réalisation particulière.Figure 19 is a schematic illustration of the method according to a particular embodiment.

La figure 20 est une illustration schématique du procédé suivant une forme de réalisation avantageuse.Figure 20 is a schematic illustration of the method according to an advantageous embodiment.

La figure 21 est une illustration schématique du procédé suivant une forme de réalisation particulièrement avantageuse.Figure 21 is a schematic illustration of the method according to a particularly advantageous embodiment.

A la figure 1, le sac 1 suivant l'invention est constitué par une matière plastique thermosoudable, et en particulier par du polyéthylène. Ce sac présente en chacune de ses deux parois 2 une zone 3, proche de son ouverture 4, dans laquelle est pratiquée une découpe 5 formant une poignée. Cette découpe de poignée peut être entre autre du type semi-emportée ou complètement découpée. Afin d'augmenter la résistance au déchirement de la zone 3, celle-ci est renforcée, d'une part, par un pli 6 rabattu sur la paroi 2 pour former un des bords 7 de l'ouverture 4 du sac 1, le bord libre 8 du pli étant disposé de l'autre côté de la découpe 5 que le bord 7 de l'ouverture du sac, et, d'autre part, par un renfort 9 réalisé par exemple à partir d'une portion de matériau plat, découpée avantageusement en forme de rectangle. Ce renfort 9 est associé au sac, d'une manière qui sera décrite plus loin, afin d'être disposé entre le pli 6 rabattu sur la paroi 2 et cette dernière. De plus, les dimensions de ce renfort sont supérieures aux dimensions correspondantes du contour 10 de la découpe 5 formant la poignée et la position du renfort est déterminée pour que la découpe 5 y soit entièrement située. Afin que le renforcement soit complet, l'invention prévoit que le pli 6 rabattu sur la paroi soit fixé, en 10' à cette dernière au moins le long de son bord libre 8, en regard de la découpe 5, sur une distance au moins égale à la dimension de cette découpe prise parallèlement au fond 14 du sac.In FIG. 1, the bag 1 according to the invention consists of a heat-sealable plastic, and in particular of polyethylene. This bag has in each of its two walls 2 a zone 3, close to its opening 4, in which a cutout 5 is formed forming a handle. This handle cutout can be, among other things, of the semi-carried type or completely cut out. In order to increase the tear resistance of zone 3, this is reinforced, on the one hand, by a fold 6 folded over the wall 2 to form one of the edges 7 of the opening 4 of the bag 1, the edge free 8 of the fold being disposed on the other side of the cutout 5 that the edge 7 of the opening of the bag, and, on the other hand, by a reinforcement 9 produced for example from a portion of flat material, advantageously cut in the shape of a rectangle. This reinforcement 9 is associated with the bag, in a manner which will be described later, in order to be disposed between the fold 6 folded over the wall 2 and the latter. In addition, the dimensions of this reinforcement are greater than the corresponding dimensions of the contour 10 of the cutout 5 forming the handle and the position of the reinforcement is determined so that the cutout 5 is entirely located there. In order for the reinforcement to be complete, the invention provides that the fold 6 folded over the wall is fixed, in 10 'to the latter at least along its free edge 8, facing the cutout 5, over a distance at least equal to the dimension of this cut taken parallel to the bottom 14 of the bag.

En effectuant cette fixation, les tensions engendrées dans les parois par le poids accumulé dans le sac, lorsque celui-ci est utilisé, se concentrent à l'endroit des poignées et se répartissent autour de chaque découpe 5 dans les épaisseurs de la paroi 2, du pli rabattu 6, et du renfort associé 9.By carrying out this fixing, the tensions generated in the walls by the weight accumulated in the bag, when the latter is used, are concentrated at the place of the handles and are distributed around each cut 5 in the thicknesses of the wall 2, folded fold 6, and associated reinforcement 9.

Suivant les cas d'espèce et l'aspect esthétique recherché et de même suivant les moyens techniques dont on dispose, on peut, tel que montré à la figure 2, rabattre le pli 6 sur la face externe 11 (figures 2, 3 et 8) ou sur la face interne 12 (figures 4 à 7)de la paroi 2 du sac 1.Depending on the specific case and the desired aesthetic appearance and likewise according to the technical means available, it is possible, as shown in FIG. 2, to fold the fold 6 over the external face 11 (FIGS. 2, 3 and 8 ) or on the internal face 12 (FIGS. 4 to 7) of the wall 2 of the bag 1.

Le renfort 9, associé au sac et situé entre le pli rabattu sur la paroi 2 et cette dernière sera fixé, selon le cas, au pli 6 (figures 2, 4 et 7) ou à la paroi 2 (figures 3, 5 et 8). Il peut aussi (figure 6) avoir une dimension plus grande qu'aux figures précédentes et être fixé au pli 6 et à la paroi 2 et ensuite replié lors de la formation du pli 6, ceci pour obtenir un renforcement encore supérieur.The reinforcement 9, associated with the bag and located between the fold folded over the wall 2 and the latter will be fixed, as the case may be, to the fold 6 (Figures 2, 4 and 7) or to the wall 2 (Figures 3, 5 and 8 ). It can also (FIG. 6) have a larger dimension than in the preceding figures and be fixed to the fold 6 and to the wall 2 and then folded up during the formation of the fold 6, this in order to obtain an even greater reinforcement.

Au cas où le renfort 9 est constitué par une matière thermosoudable compatible avec la matière constituant les parois 2 et les plis 6, il pourra avantageusement être soudé à la paroi et/ou au pli. Parce que, d'une part, cette soudure est appliquée à une surface importante du renfort 9 et que, d'autre part, le renfort et la paroi 2 ou le pli 6 n'ont pas la même épaisseur et ne sont éventuellement pas constitués par la même matière, la paroi fronce à l'endroit de cette soudure. Pour dissimuler le phénomène, on choisira la disposition de la figure 3 pour laquelle le renfort 9, étant fixé à la paroi 2 du sac, la marque de la soudure est cachée à l'intérieur du sac.If the reinforcement 9 is constituted by a heat-sealable material compatible with the material constituting the walls 2 and the folds 6, it can advantageously be welded to the wall and / or to the fold. Because, on the one hand, this weld is applied to a large surface of the reinforcement 9 and that, on the other hand, the reinforcement and the wall 2 or the fold 6 do not have the same thickness and possibly do not consist by the same material, the wall gathered at the place of this weld. To hide the phenomenon, we choose the arrangement of Figure 3 for which the reinforcement 9, being attached to the wall 2 of the bag, the weld mark is hidden inside the bag.

On peut encore préférer la disposition suivant la figure 4 où la marque de la soudure et le bord libre 8 sont dissimulés à la vue pour améliorer la finition extérieure du sac tout en lui assurant la même résistance.We can still prefer the arrangement according to Figure 4 where the weld mark and the free edge 8 are hidden from view to improve the exterior finish of the bag while ensuring the same resistance.

Au cas où le renfort 9 est collé soit à la paroi 2 soit au pli 6, on peut aussi bien adopter l'une des quatre solutions représentées aux figures 2 à 5, puisque ce mode de fixation du renfort ne déforme pas l'élément auquel on le fixe.In the case where the reinforcement 9 is glued either to the wall 2 or to the fold 6, it is also possible to adopt one of the four solutions shown in FIGS. 2 to 5, since this method of fixing the reinforcement does not deform the element to which we fix it.

La fixation du pli 6 à la paroi 2 est ordinairement réalisée par une soudure 13, cette dernière consistant soit en des points de soudure ou encore avantageusement en une ligne de soudure. Celle-ci ne provoque pas de déformation importante de la paroi parce que la soudure 13 réunit deux matières (paroi et pli) identiques au point de vue de leurs caractéristiques et de leurs épaisseurs. Cette soudure 13 sera de préférence disposée parallèlement au bord libre 8 du pli, ce dernier étant normalement coupé droit suivant une parallèle au fond 14 du sac.The fixing of the fold 6 to the wall 2 is usually carried out by a weld 13, the latter consisting either of weld points or advantageously in a weld line. This does not cause significant deformation of the wall because the weld 13 combines two materials (wall and fold) identical from the point of view of their characteristics and their thicknesses. This weld 13 will preferably be arranged parallel to the free edge 8 of the fold, the latter normally being cut straight along a parallel to the bottom 14 of the bag.

Suivant une forme de réalisation, le renfort 9 est constitué en partie par un matériau tel que du carton et en partie par un matériau thermosoudable ou encore entièrement par un matériau thermosoudable compatible avec la matière thermosoudable du pli 6 ou de la paroi 2. Dans ce cas, le renfort ayant une dimension B suffisante et étant agencé de manière adéquate, peut être réuni, dans sa partie thermosoudable, à la paroi 2 et au pli 6 par la soudure 13 fixant le pli à la paroi 2 (figure 7 et 8). Ceci s'ajoute à la fixation précitée du renfort à la paroi ou au pli pour assurer une solidité plus grande de la zone de renforcement.According to one embodiment, the reinforcement 9 consists partly of a material such as cardboard and partly of a heat-sealable material or entirely of a heat-sealable material compatible with the heat-sealable material of the fold 6 or of the wall 2. In this In this case, the reinforcement having a sufficient dimension B and being suitably arranged, can be joined, in its heat-sealable part, to the wall 2 and to the fold 6 by the weld 13 fixing the fold to the wall 2 (FIGS. 7 and 8) . This is added to the aforementioned fixing of the reinforcement to the wall or to the fold to ensure greater solidity of the reinforcement zone.

Suivant une forme de réalisation de l'invention, le renfort 9 (figures 2 à 5) aura une dimension B, prise perpendiculairement au bord 7 de l'ouverture du sac, inférieure à la distance prise entre ledit bord 7 et la soudure 13. Dans ce cas, le renfort 9 pourra être fixé à la paroi 2 ou au pli 6 de la zone de renforcement 3 pour être situé à l'écart de la soudure 13. Ainsi faisant, si la soudure 13 s'étend d'un bord 17 à l'autre du sac, elle est plus facile à réaliser puisqu'elle associe d'un bout à l'autre les deux mêmes matières (pli 6 et paroi 2) dont les épaisseurs sont généralement constantes.According to one embodiment of the invention, the reinforcement 9 (FIGS. 2 to 5) will have a dimension B, taken perpendicular to the edge 7 of the opening of the bag, less than the distance taken between said edge 7 and the weld 13. In this case, the reinforcement 9 may be fixed to the wall 2 or to the fold 6 of the reinforcement zone 3 so as to be located away from the weld 13. Thus, if the weld 13 extends from one edge 17 to the other of the bag, it is easier to produce since it combines from one end to the other the same two materials (fold 6 and wall 2) whose thicknesses are generally constant.

Pour améliorer encore l'efficacité du renforcement dans la zone 3 du sac, on peut avantageusement prévoir au moins deux soudures 16, chacune étant réalisée de part et d'autre de la découpe 5. Ces deux soudures sont au moins transversales aux bords 7 de l'ouverture du sac. Il est cependant plus aisé dans la plupart des cas de disposer ces soudures 16 perpendiculairement audit bord 7.To further improve the effectiveness of the reinforcement in zone 3 of the bag, it is advantageous to provide at least two welds 16, each being carried out on either side of the cutout 5. These two welds are at least transverse to the edges 7 of opening the bag. It is however easier in most cases to have these welds 16 perpendicular to said edge 7.

Il est prévu de situer ces soudures 16 en un endroit de la zone 3 où se situe le renfort 9 afin que ces soudures fixent la paroi 2 et le pli 6 au renfort 9. Si cependant elles sont réalisées de part et d'autre du renfort 9, elles fixent le pli 6 à la paroi 2 (figures 10 et 11).It is planned to locate these welds 16 at a location in zone 3 where the reinforcement 9 is located so that these welds fix the wall 2 and the fold 6 to the reinforcement 9. If however they are made on either side of the reinforcement 9, they fix the fold 6 to the wall 2 (Figures 10 and 11).

Parmi les sacs 1 suivant l'invention, se trouvent entre autre des sacs dénommés sacs à soudures latérales (figures 12, 14 et 16). Ces derniers sacs sont réalisés à partir d'une feuille de matière plastique pliée en deux, le pli 13' ainsi obtenu forme le fond 14 du sac (figure 13). Les deux parois 2 constituées par une portion de la feuille de matière plastique sont fixées l'une à l'autre, le long de chacun de leurs bords 17 contigus au fond 14 formé par le pli 13', par une soudure 18 bien connue de l'homme de métier.Among the bags 1 according to the invention, there are inter alia bags called bags with lateral welds (Figures 12, 14 and 16). These latter bags are produced from a sheet of plastic material folded in half, the fold 13 'thus obtained forms the bottom 14 of the bag (FIG. 13). The two walls 2 constituted by a portion of the plastic sheet are fixed to each other, along each of their edges 17 contiguous to the bottom 14 formed by the fold 13 ', by a weld 18 well known from the skilled person.

Dans le cas des sacs à soudures latérales, les soudures 16 transversales ou perpendiculaires au bord 7 de l'ouverture 4 sont avantageusement réalisées par les soudures latérales 18 du sac. Les soudures 16 peuvent cependant venir en complément de ces soudures latérales 18, et être situées entre ces dernières et la découpe de poignée 5.In the case of bags with lateral welds, the welds 16 transverse or perpendicular to the edge 7 of the opening 4 are advantageously produced by the lateral welds 18 of the bag. The welds 16 may however complement these lateral welds 18, and be located between the latter and the handle cutout 5.

Le fond 14 du sac 1 peut être formé par un pli 13' comme déjà mentionné ci-dessus, il peut cependant être formé par plusieurs plis 19 de manière à présenter un soufflet 20 (figure 15) qui, lorsqu'il est déplié, permet de poser le sac debout pour faciliter l'introduction des objets à y mettre.The bottom 14 of the bag 1 can be formed by a fold 13 'as already mentioned above, it can however be formed by several folds 19 so as to present a bellows 20 (FIG. 15) which, when unfolded, allows to put the bag upright to facilitate the introduction of the objects to put in it.

En général, la découpe 5 servant de poignée pour les sacs 1 est disposée à égale distance des bords 17 contigus au fond 14 du sac, le renfort étant aussi pratiquement à égale distance de ces bords 17.In general, the cutout 5 serving as a handle for the bags 1 is placed at equal distance from the edges 17 contiguous to the bottom 14 of the bag, the reinforcement also being practically at equal distance from these edges 17.

Dans certains cas cependant la découpe 5 et le renfort 9 de chaque paroi 2 sont volontairement décalés de manière à être plus proche d'un des bords 17 (figure 16). Ceci permet de transporter ainsi des objets dépassant du sac le long du bord 17 opposé au premier bord cité.In certain cases, however, the cutout 5 and the reinforcement 9 of each wall 2 are deliberately offset so as to be closer to one of the edges 17 (FIG. 16). This makes it possible to transport objects protruding from the bag along the edge 17 opposite the first cited edge.

Le sac suivant la figure 1 peut être un sac dont le fond est formé par une soudure reliant les deux parois 2, les bords latéraux 17 étant constitués par les plis réunissant les deux parois 2 et obtenus par exemple par extrusion et soufflage de la matière plastique. Les sacs représentés aux figures 9 à 11 sont des modèles qui peuvent aussi être appliqués aux sacs à soudure de fond. Les bords latéraux de ces sacs à soudure de fond comportent des soufflets dans une forme de réalisation avantageuse du sac suivant l'invention.The bag according to FIG. 1 can be a bag, the bottom of which is formed by a weld connecting the two walls 2, the lateral edges 17 being constituted by the folds joining the two walls 2 and obtained for example by extrusion and blowing of the plastic material. . The bags shown in Figures 9 to 11 are models that can also be applied to bottom weld bags. The side edges of these bottom welded bags have bellows in an advantageous embodiment of the bag according to the invention.

L'invention prévoit (figures 17 et 18) un procédé de fabrication du sac 1 décrit ci-dessus. Ce procédé s'applique soit dans le cas d'un sac déjà formé soit pour un sac en cours de formation, indépendamment du fait que le sac comporte une soudure de fond ou des soudures latérales. Le procédé consiste, pour renforcer la zone 3 de chaque paroi 2 ou l'on pratique une découpe 5 servant de poignée, à présenter en 55 une paire de renforts 9, que l'on a déjà défini ci-dessus, à proximité des bords libres 21 (figure 19) des parois du sac disposées à plat, le procédé de fabrication desdits renforts 9 étant connu en soi. On fixe simutanément un renfort 9 de la paire à chaque paroi 2 correspondante du sac de manière à être associé à cette paroi 2 pour occuper la position prévue entre le pli rabattu 6 ci-après et la paroi 2. Cette fixation peut être obtenue par collage du renfort 9 à la paroi 2 ou, si le renfort 9 est constitué par une matière plastique thermosoudable compatible avec la matière du sac, il peut être soudé à cette paroi 2 sur une partie importante de sa surface. Ensuite on forme simultanément en 57 le long du bord libre 21 de chaque paroi 2 le pli 6 précité et l'on rabat simultanément en 58' les deux plis 6 sur leur paroi 2 correspondante. Ces deux plis 6 peuvent être rabattus soit sur la face externe 11 de leur paroi 2 correspondante soit sur la face interne 12 de ces dernières. On pourrait aussi le cas échéant rabattre un des deux plis sur la face externe 11 et l'autre sur la face interne 12 de leur paroi 2 correspondante. Ces plis 6 sont formés et rabattus pour que chaque renfort 9 soit situé, sur au moins une partie importante de sa surface, entre la paroi 2 et le pli 6 correspondants. On fixe simultanément (en 59) chacun des plis rabattus 6 à la paroi 2 correspondante sur une distance au moins égale à la dimension des découpes 5, formant les poignées, prise parallèlement au fond du sac, cette fixation se faisant le long du bord libre 8 du pli 6, en regard de ladite découpe 5, entre celle-ci et le bord libre 8 du pli rabattu. Cette fixation consistera avantageusement en une soudure 13. D'après les dimensions et les positions relatives des plis et des renforts, on soude ainsi le pli 6 à la paroi 2 correspondante pour obtenir un sac suivant l'une des figures 2 à 5 ou bien on soude le renfort 9 au pli 6 et à la paroi 2 dans la zone dudit renfort (figures 7 et 8) et éventuellement en dehors de cette zone, on soude le pli rabattu 6 à la paroi 2 correspondante. On pratique enfin en 64 simultanément les découpes 5 servant de poignées dans la zone de renforcement 3 de chacune des deux parois 2 ainsi constituée et comprenant la paroi 2, le renfort 9 et le pli rabattu 6 sur la paroi 2.The invention provides (Figures 17 and 18) a method of manufacturing the bag 1 described above. This process applies either in the case of a bag already formed or for a bag in the process of being formed, regardless of whether the bag has a bottom weld or lateral welds. The method consists, in order to reinforce the zone 3 of each wall 2 where a cutout 5 serving as a handle is practiced, to present at 55 a pair of reinforcements 9, which have already been defined above, near the edges free 21 (Figure 19) of the walls of the bag arranged flat, the method of manufacturing said reinforcements 9 being known per se. A reinforcement 9 of the pair is simultaneously fixed to each corresponding wall 2 of the bag so as to be associated with this wall 2 to occupy the position provided between the folded fold 6 below and the wall 2. This fixing can be obtained by gluing of the reinforcement 9 to the wall 2 or, if the reinforcement 9 consists of a heat-sealable plastic material compatible with the material of the bag, it can be welded to this wall 2 over a large part of its surface. Then the above fold 6 is formed simultaneously at 57 along the free edge 21 of each wall 2 and the two folds 6 are folded simultaneously at 58 'on their corresponding wall 2. These two folds 6 can be folded down either on the external face 11 of their corresponding wall 2 or on the internal face 12 of the latter. One could also if necessary fold down one of the two folds on the external face 11 and the other on the internal face 12 of their corresponding wall 2. These folds 6 are formed and folded down so that each reinforcement 9 is located, on at least a large part of its surface, between the wall 2 and the corresponding fold 6. Each of the folded folds 6 is fixed simultaneously (at 59) to the corresponding wall 2 over a distance at least equal to the size of the cutouts 5, forming the handles, taken parallel to the bottom of the bag, this fixing being done along the free edge 8 of the fold 6, opposite said cut 5, between the latter and the free edge 8 of the folded fold. This fixing will advantageously consist of a weld 13. According to the dimensions and the relative positions of the folds and the reinforcements, the fold 6 is thus welded to the corresponding wall 2 to obtain a bag according to one of FIGS. 2 to 5 or else the reinforcement 9 is welded to the fold 6 and to the wall 2 in the zone of said reinforcement (FIGS. 7 and 8) and optionally outside this zone, the folded fold 6 is welded to the corresponding wall 2. Finally, at 64, the cutouts 5 serving as handles are practiced in the reinforcement zone 3 of each of the two walls 2 thus formed and comprising the wall 2, the reinforcement 9 and the folded fold 6 on the wall 2.

Dans le cas d'un sac à soudures latérales tel que représenté aux figures 12, 14 et 16, le procédé comporte plus spécialement les opérations suivantes intégrées dans le cours de la formation dudit sac 1. On entraîne en 50 (figures 17 et 18), pas à pas et suivant son axe longitudinal un ruban de matière plastique 51 constitué de deux épaisseurs 52 (figure 19) superposées qui sont réunies par un pli 53 formant un des bords longitudinaux du ruban, ce pli 53 étant destiné à constituer les fonds 14 des sacs. Ce ruban 51 peut être obtenu de différentes manières. On peut prendre une matière en simple épaisseur que l'on plie en deux. On peut également utiliser un ruban constitué de deux épaisseurs 52, reliées entre elles par un pli le long de chacun des bords de ces deux épaisseurs. Un tel ruban est obtenu par extrusion, soufflage et enroulement après mise à plat du boyau ainsi formé pour des matières plastiques comme la polyéthylène. Dans ce dernier cas, un des deux plis formés lors de la mise à plat du boyau est coupé pour servir d'ouverture au sac tandis que le second pli 53 est gardé pour constituer les fonds 14 des sacs. Chaque pas du mouvement pas à pas précité correspond à la dimension L d'un sac à fabriquer, cette dimension étant prise parallèlement au pli 53 susdit formant le fond 14 du sac. Ce mouvement pas à pas permet d'effectuer des opérations pendant un temps d'arrêt cyclique du ruban 51. Au préalable on écarte en 54 l'une de l'autre les deux épaisseurs formant le ruban. Ceci permet d'introduire en 55 une paire de renforts 9 entre ces deux épaisseurs 52, à chaque pas et transversalement à l'axe longitudinal du ruban. Ils peuvent être introduits soit pendant le mouvement du ruban 51 soit à l'arrêt de ce dernier. La dimension A de ces parties de renforts, prise parallèlement au pli 53, est inférieure au pas susdit. L'autre dimension B des renforts est déterminée par les dimensions de la découpe 5 formant poignée et par la zone 3 que l'on veut renforcer. A chaque arrêt du moment pas à pas on fixe un renfort 9 de la paire à l'épaisseur 52 correspondante le long du bord libre 52' de cette épaisseur qui est opposé au pli 53. On peut fixer ce renfort 9 soit à l'aide d'une colle soit au moyen d'une soudure, faite sur une partie importante de sa surface. Le collage se fait de préférence en enduisant la face de fixation du renfort 9, à l'aide d'un produit ou d'un mélange de produits qui devient adhésif après un temps de séchage, et éventuellement un réchauffement pour activer ce séchage. La fixation étant réalisée, on donne en 56 au ruban de matière 51 un mouvement continu suivant son axe longitudinal et dans le même sens que le mouvement pas à pas susdit. Pendant ce mouvement continu, on forme en 57 un pli 6 le long de chaque bord libre 52' des épaisseurs 52 dudit ruban 51, la dimension C de ce pli, prise perpendiculairement à l'axe longitudinal du ruban, étant supérieure à la distance qui sépare le bord le plus éloigné, 58 d'un renfort du bord libre 52' de l'épaisseur 52 correspondante. Ensuite on rabat, pendant ce mouvement continu du ruban 51, les plis 6 formés sur les faces des épaisseurs susdites qui sont tournées l'une vers l'autre et qui constitueront les faces internes 12 des parois du sac.In the case of a bag with lateral welds as shown in FIGS. 12, 14 and 16, the method more especially comprises the following operations integrated in the course of the formation of said bag 1. We train at 50 (FIGS. 17 and 18) , step by step and along its longitudinal axis a plastic tape 51 consisting of two thicknesses 52 (Figure 19) superimposed which are joined by a fold 53 forming one of the longitudinal edges of the ribbon, this fold 53 being intended to constitute the funds 14 of the bags. This ribbon 51 can be obtained in different ways. We can take a single thickness material that we fold in half. One can also use a ribbon made up of two thicknesses 52, linked together by a fold along each of the edges of these two thicknesses. Such a tape is obtained by extrusion, blowing and winding after flattening the hose thus formed for plastics such as polyethylene. In the latter case, one of the two folds formed during the flattening of the hose is cut to serve as an opening to the bag while the second fold 53 is kept to constitute the bottoms 14 of the bags. Each step of the aforementioned step-by-step movement corresponds to the dimension L of a bag to be produced, this dimension being taken parallel to the above fold 53 forming the bottom 14 of the bag. This step-by-step movement makes it possible to carry out operations during a cyclic stopping time of the ribbon 51. Beforehand, the two thicknesses forming the ribbon are separated at 54 from one another. This makes it possible to introduce at 55 a pair of reinforcements 9 between these two thicknesses 52, at each step and transversely to the longitudinal axis of the ribbon. They can be introduced either during the movement of the ribbon 51 or when the latter stops. The dimension A of these reinforcing parts, taken parallel to the fold 53, is less than the above-mentioned pitch. The other dimension B of the reinforcements is determined by the dimensions of the cutout 5 forming a handle and by the area 3 that we want to reinforce. At each stop of the moment step by step, a reinforcement 9 of the pair is fixed to the corresponding thickness 52 along the free edge 52 'of this thickness which is opposite to the fold 53. This reinforcement 9 can be fixed either using of an adhesive either by means of a weld, made over a large part of its surface. Bonding is preferably done by coating the fixing face of the reinforcement 9, using a product or a mixture of products which becomes adhesive after a drying time, and possibly reheating to activate this drying. The fixing being carried out, the strip of material 51 is given at 56 a continuous movement along its longitudinal axis and in the same direction as the above-mentioned stepwise movement. During this continuous movement, a fold 6 is formed at 57 along each free edge 52 ′ of the thicknesses 52 of said strip 51, the dimension C of this fold, taken perpendicular to the longitudinal axis of the ribbon, being greater than the distance which separates the most distant edge, 58 from a reinforcement of the free edge 52 'of the corresponding thickness 52. Then, during this continuous movement of the ribbon 51, the folds 6 formed on the faces of the above-mentioned thicknesses which are turned towards each other and which will constitute the internal faces 12 of the walls of the bag are folded down.

La fixation des plis ainsi rabattus aux parois correspondantes peut avantageusement être réalisée par une soudure 13. Celle-ci peut se faire, soit en 59, pendant le mouvement continu du ruban précité, soit en 60 à chaque arrêt du mouvement pas à pas de ce ruban. Dans le premier cas, une soudure en continu sera effectuée par exemple pour chaque paroi, par un élément 61 allongé dans le sens du mouvement du ruban, chauffé électriquement et rayonnant une chaleur suffisante vers le ruban afin de fondre ensemble la paroi 2 et le pli 6 le long du bord libre 8 de ce dernier. Dans le second cas, on transforme d' abord en 62 le mouvement continu du ruban 51 en un mouvement pas à pas dont le pas est égal à celui du mouvement pas à pas précité et suivant la même direction et le même sens que ceux du mouvement continu. A chaque arrêt de ce dernier mouvement pas à pas, on amène contre le pli 6 et la paroi 2 un élément 63, disposé parallèlement à la direction de déplacement du ruban et chauffé, afin de presser l'un sur l'autre le pli et la paroi et de les fondre ensemble par pression et par chaleur pour les souder le long du bord libre 8 du pli rabattu.The fixing of the folds thus folded down to the corresponding walls can advantageously be carried out by a weld 13. This can be done either at 59, during the continuous movement of the above-mentioned ribbon, or at 60 at each stop of the stepwise movement of this ribbon. In the first case, a continuous weld will be carried out for example for each wall, by an element 61 elongated in the direction of movement of the ribbon, electrically heated and radiating sufficient heat towards the ribbon in order to melt wall 2 and the fold together. 6 along the free edge 8 of the latter. In the second case, the continuous movement of the ribbon 51 is first transformed into 62 into a step-by-step movement whose step is equal to that of the aforementioned step-by-step movement and in the same direction and the same direction as those of the movement continued. At each stop of this last step-by-step movement, an element 63 is brought against the fold 6 and the wall 2, arranged parallel to the direction of movement of the ribbon and heated, in order to press the fold one on the other and the wall and melt them together by pressure and heat to weld them along the free edge 8 of the folded fold.

Dans les deux cas de soudure, en continu ou en pas à pas, énoncés ci-dessus, il est possible de choisir l'endroit de la soudure 13 sur le sac pour que celle-ci associe uniquement le pli rabattu 6 à la paroi 2, lorsque cette soudure 13 est pratiquée entre le renfort 9 et le bord libre 8 du pli (cas du sac de la figure 4). La soudure 13 peut encore être avantageusement localisée entre la découpe 5 et le bord, du renfort 9, le plus proche du bord libre 8 et parallèle à celui-ci (cas du sac de la figure 7). De cette manière, elle fixe le renfort 9 au pli 6 et à la paroi 2 et, hors dudit renfort 5, elle fixe le pli 6 à la paroi 2. Dans la zone 3 de chaque paroi 2 ainsi renforcée, à chaque arrêt du ruban 51 résultant du mouvement pas à pas, on pratique en 64 la découpe 5 servant de poignée, au moyen d'un couteau dont la commande sera décrite ci-après.In the two cases of welding, continuous or step by step, set out above, it is possible to choose the location of the welding 13 on the bag so that it associates only the folded fold 6 with the wall 2 , when this weld 13 is made between the reinforcement 9 and the free edge 8 of the fold (case of the bag in FIG. 4). The weld 13 can also advantageously be located between the cutout 5 and the edge of the reinforcement 9, the closest to the free edge 8 and parallel to it (case of the bag in FIG. 7). In this way, it fixes the reinforcement 9 to the fold 6 and to the wall 2 and, outside said reinforcement 5, it fixes the fold 6 to the wall 2. In the zone 3 of each wall 2 thus reinforced, at each stop of the tape 51 resulting from the step-by-step movement, 64 is practiced cutting 5 serving as a handle, by means of a knife, the control of which will be described below.

De plus, pendant un arrêt du ruban 51 résultant de ce même mouvement pas à pas, les deux épaisseurs 52 sont réunies en 66 par l'action d'au moins un élément chauffé et disposé perpendiculairement au sens de déplacement du ruban 51 et pressé momentanément contre les deux épaisseurs 52 pour effectuer une soudure. Cette soudure 18 obtenue par chaleur et pression réalise les bords latéraux 17 contigus de deux sacs 1 successifs en cours de formation. Cette soudure est effectuée entre deux paires de découpes 5, soit à une distance égale de ces deux paires de découpes (figure 12) soit encore à des distances inégales de ces deux paires si l'on désire obtenir un sac tel qu'illustré à la figure 16. Le sac en formation qui est le plus en aval par rapport au sens de déplacement du ruban de matière plastique est formé par cette dernière opération de soudure et il est séparé du sac en formation, qui lui est immédiatement voisin, entre son bord latéral 17 et le bord latéral 17 qui lui est contigu et qui appartient au dernier sac en formation.In addition, during a stop of the ribbon 51 resulting from this same step-by-step movement, the two thicknesses 52 are joined at 66 by the action of at least one heated element and arranged perpendicular to the direction of movement of the ribbon 51 and momentarily pressed. against the two thicknesses 52 to make a weld. This weld 18 obtained by heat and pressure produces the contiguous lateral edges 17 of two successive bags 1 during formation. This welding is carried out between two pairs of cuts 5, either at an equal distance from these two pairs of cuts (FIG. 12) or even at unequal distances from these two pairs if it is desired to obtain a bag as illustrated in FIG. figure 16. The bag in formation which is furthest downstream with respect to the direction of movement of the plastic tape is formed by this last welding operation and it is separated from the bag in formation, which is immediately adjacent to it, between its edge lateral 17 and the lateral edge 17 which is contiguous to it and which belongs to the last bag in formation.

Un autre procédé de fabrication d'un sac 1 suivant l'invention consiste, pour renforcer les sacs en cours de formation, à effectuer les mêmes opérations que celles décrites ci-dessus, à savoir : entraîner pas à pas et suivant son axe longitudinal un ruban 51 de matière plastique formé de deux épaisseurs superposées 52 réunies par un pli 53 formant un des bords longitudinaux du ruban 51 et destiné à constituer les fonds des sacs. Chaque pas correspond encore à la dimension L du sac à fabriquer. On écarte l'une de l'autre les deux épaisseurs 52, on introduit entre ces deux épaisseurs 52 écartées, transversalement à l'axe longitudinal du ruban 51, à chaque pas et soit lorsque le ruban est en mouvement soit à l'arrêt, une paire de renforts 9 dont la dimension A est inférieure à un pas. On fixe en 55, pendant chaque arrêt, un renfort 9 à l'épaisseur correspondante 52, le long de son bord libre 52'. Le ruban est toujours entraîné par le même mouvement pas à pas et, pendant le mouvement ou pendant l'arrêt, on forme un pli 6 le long des deux bords libres 52', la dimension C de ce pli étant supérieure à la distance séparant le bord 58 d'un renfort du bord libre 52' de l'épaisseur correspondante. De même, pendant le mouvement pas à pas ou pendant son arrêt, on rabat les plis 6 ainsi formés sur les faces 12 des épaisseurs 52 pour que ces plis 6 se présentent à l'intérieur du sac, les renforts 9 étant situés entre ces plis 6 et l'épaisseur 52 correspondante. On réalise ensuite la soudure 13, lors de chaque arrêt du pas à pas, des plis 6 rabattus sur les épaisseurs 53 à ces dernières, parallèlement aux bords libres 8. On dispose avantageusement la soudure 13 pour obtenir soit un sac suivant les figures 4 et 5 où le renfort 9 n'est pas fixé au pli 6 et à la paroi 2 par cette soudure 13, soit un sac par exemple suivant la figure 7, pour lequel le renfort 9 est fixé au pli 6 et à la paroi 2 par la soudure 13. A partir de cette étape, on retrouve les étapes déjà décrites dans le procédé précédent. Dans la zone 3 ainsi renforcée, on pratique en 64 la découpe 5 lors de chaque arrêt du ruban 51. Ensuite, on forme les bords latéraux 17 du sac par une soudure en 66 lors de chaque arrêt du ruban 51 et on sépare un sac 1 formé du sac immédiatement voisin qui est en formation.Another method of manufacturing a bag 1 according to the invention consists, in order to reinforce the bags being formed, in carrying out the same operations as those described above, namely: driving step by step and along its longitudinal axis a ribbon 51 of plastic material formed of two superimposed thicknesses 52 joined by a fold 53 forming one of the longitudinal edges of the ribbon 51 and intended to constitute the bottoms of the bags. Each step still corresponds to the dimension L of the bag to be manufactured. The two thicknesses 52 are moved apart from each other, between these two thicknesses 52 separated, introduced transversely to the longitudinal axis of the ribbon 51, at each step and either when the ribbon is in motion or at a standstill, a pair of reinforcements 9 whose dimension A is less than one step. Is fixed at 55, during each stop, a reinforcement 9 to the corresponding thickness 52, along its free edge 52 '. The ribbon is always driven by the same movement step by step and, during the movement or during the stop, a fold 6 is formed along the two free edges 52 ′, the dimension C of this fold being greater than the distance separating the edge 58 of a reinforcement of the free edge 52 'of the corresponding thickness. Similarly, during the stepwise movement or during its stopping, the folds 6 thus formed are folded down on the faces 12 of thicknesses 52 so that these folds 6 are present inside the bag, the reinforcements 9 being located between these folds 6 and the corresponding thickness 52. The weld 13 is then produced, at each stop of the step by step, folds 6 folded over the thicknesses 53 to the latter, parallel to the free edges 8. The weld 13 is advantageously arranged to obtain either a bag according to FIGS. 4 and 5 where the reinforcement 9 is not fixed to the fold 6 and to the wall 2 by this weld 13, or a bag for example according to FIG. 7, for which the reinforcement 9 is fixed to the fold 6 and to the wall 2 by the welding 13. From this step, we find the steps already described in the previous process. In the zone 3 thus reinforced, the cutting 5 is practiced at 64 at each stop of the ribbon 51. Then, the lateral edges 17 of the bag are formed by a weld at 66 at each stop of the ribbon 51 and a bag 1 is separated formed from the immediately adjacent bag that is being formed.

Pour fixer chaque pli 6 à l'épaisseur 52 correspondante, une technique consiste à réaliser la soudure 13 lors de chaque arrêt du mouvement pas à pas pendant que l'on réalise la découpe 5 simultanément dans les deux épaisseurs 52.To fix each fold 6 to the corresponding thickness 52, one technique consists in carrying out the weld 13 during each stop of the movement step by step while the cut 5 is made simultaneously in the two thicknesses 52.

Une autre technique consiste à faire cette soudure 13 en continu pendant que le ruban 51 est déplacé en continu suivant son axe longitudinal pour former les plis 6 et les rabattre sur leur épaisseur correspondante.Another technique consists in making this weld 13 continuously while the ribbon 51 is moved continuously along its longitudinal axis to form the folds 6 and fold them over their corresponding thickness.

Au lieu de présenter et de fixer les renforts 9 à un ruban 51 en deux épaisseurs 52 comme décrit ci-dessus, il est possible de former le sac suivant l'invention à partir d'un ruban de matière en simple épaisseur 70 (figure 20) que l'on entraîne en continu, par exemple pour le dérouler d'une bobine sur laquelle il est stocké. On transforme ce mouvement en un mouvement pas à pas pour poser les renforts 9 en 71 le long des deux bords longitudinaux 52' du ruban et pour les y fixer lors de chaque arrêt du mouvement pas à pas puis on transforme le mouvement pas à pas du ruban 70 en un mouvement continu mieux adapté à l'opération suivante qui consiste à plier en deux le ruban en simple épaisseur 70 le long de son axe longitudinal pour obtenir un ruban en double épaisseur. Les opérations suivantes sont celles déjà décrites ci-dessus et consistent à former et à rabattre les plis 6, à fixer ces plis 6, à pratiquer la découpe 5 et à former les bords latéraux 17 du sac. Elles supposent les mêmes changements de mouvement continu en mouvement pas à pas et vice-versa. Ce dernier pliage se fait en 71'.Instead of presenting and fixing the reinforcements 9 to a ribbon 51 in two thicknesses 52 as described above, it is possible to form the bag according to the invention from a ribbon of single-thickness material 70 (FIG. 20 ) that is driven continuously, for example to unwind a coil on which it is stored. This movement is transformed into a step-by-step movement to place the reinforcements 9 at 71 along the two longitudinal edges 52 ′ of the ribbon and to fix them there at each stop of the step-by-step movement then the step-by-step movement of the ribbon 70 in one movement continuous better suited to the following operation which consists in folding in two the single thickness ribbon 70 along its longitudinal axis to obtain a double thickness ribbon. The following operations are those already described above and consist of forming and folding the folds 6, fixing these folds 6, making the cut 5 and forming the side edges 17 of the bag. They assume the same changes of continuous movement in step by step movement and vice versa. This last folding is done in 71 '.

Le sens des mouvements pendant ces opérations est toujours le même malgré la ou les transformations de mouvement.The direction of movement during these operations is always the same despite the movement transformation (s).

Si l'on désire réaliser le sac 1 suivant l'invention à partir d'un ruban 70 en simple épaisseur, il est encore possible (figure 21) d'entraîner ce ruban en continu, par exemple pour le dérouler d'une bobine de stockage, suivant son axe longitudinal et de l'amener en 71 où l'on présente transversalement à cet axe, de renforts 9 par paires, le long des bords libres 52' du ruban 70. Pendant cet entraînement en continu du ruban 70, on mesure le passage de longueurs de ruban égales à la dimension L du sac. Chaque fois que l'on détecte une telle longueur, on communique aux renforts 9 d'une paire une vitesse sensiblement égale à la vitesse du ruban 70 pour qu'ils se déplacent dans le même sens et la même direction que ce ruban 70 et l'on fixe, soit par collage, soit par soudage, les renforts 9 d'une paire à l'épaisseur simple de matière pendant ce mouvement commun. Au moment où l'on a détecter la longueur égale à la dimension L du sac, on recommence la mesure pour détecter cycliquement cette longueur. Ainsi, les paires de renforts 9 seront fixées le long des bords 52' de manière que les renforts situés le long d'un même bord soient équidistants tandis que les renforts d'une même paire sont en regard l'un de l'autre. Ensuite, toujours pendant ce même mouvement continu, on forme les plis 6 en 72 pour qu'ils aient une dimension C, prise perpendiculairement à l'axe longitudinal du ruban 70, qui soit supérieure à la distance séparant le bord 58 d'un renfort du bord libre 52' correspondant. On rabat ces plis formés en 73 sur la face du ruban 70 d'épaisseur simple de manière que les renforts 9 soient situés entre les plis et la face correspondante du ruban. Toujours pendant le mouvement continu, on fixe en 74 les plis à l'épaisseur correspondante par une soudure continue, déjà mentionnée plus haut, le long de leurs bords libres 8. La figure 20 montre cette soudure 13 à l'écart des renforts 9 mais elle peut également être disposée pour souder les renforts 9 au pli rabattu 6 et à l'épaisseur correspondante du ruban 70. Ensuite, on plie en deux le ruban ainsi renforcé, le long de ses deux bords longitudinaux, suivant son axe longitudinal pour constituer le ruban en double épaisseur dans lequel les renforts d'une même paire se superposent. Les opérations suivantes ont déjà été décrites ci-dessus, elles débutent par la réalisation de la découpe 5. Le dernier pliage cité se fait en 71'.If it is desired to make the bag 1 according to the invention from a ribbon 70 in single thickness, it is still possible (FIG. 21) to drive this ribbon continuously, for example to unwind it from a reel of storage, along its longitudinal axis and bringing it to 71 where there is transversely to this axis, reinforcements 9 in pairs, along the free edges 52 ′ of the tape 70. During this continuous drive of the tape 70, measures the passage of lengths of tape equal to the dimension L of the bag. Each time that such a length is detected, the reinforcements 9 of a pair are communicated a speed substantially equal to the speed of the ribbon 70 so that they move in the same direction and the same direction as this ribbon 70 and the 'is fixed, either by gluing or by welding, the reinforcements 9 of a pair to the simple thickness of material during this common movement. When the length equal to the dimension L of the bag has been detected, the measurement is repeated to cyclically detect this length. Thus, the pairs of reinforcements 9 will be fixed along the edges 52 'so that the reinforcements located along the same edge are equidistant while the reinforcements of the same pair are opposite one another. Then, still during this same continuous movement, the folds 6 are formed at 72 so that they have a dimension C, taken perpendicular to the longitudinal axis of the strip 70, which is greater than the distance separating the edge 58 from a reinforcement. from the corresponding free edge 52 '. These folds formed at 73 are folded over the face of the ribbon 70 of simple thickness so that the reinforcements 9 are located between the folds and the corresponding face of the ribbon. Always during the continuous movement, the folds are fixed at 74 at the corresponding thickness by a continuous weld, already mentioned above, along their free edges 8. FIG. 20 shows this weld 13 away from the reinforcements 9 but it can also be arranged to weld the reinforcements 9 to the folded fold 6 and to the corresponding thickness of the ribbon 70. Then, the ribbon thus reinforced is folded in half, along its two longitudinal edges, along its longitudinal axis to form the ribbon in double thickness in which the reinforcements of the same pair overlap. The following operations have already been described above, they begin with the production of the cutout 5. The last folding mentioned is done at 71 '.

La présente invention prévoit aussi une installation pour la mise en oeuvre du procédé ou d'un des procédés décrits ci-avant.The present invention also provides an installation for implementing the method or one of the methods described above.

Une installation suivant l'invention comprend (figures 17 et 18) des moyens connus en soi consistant par exemple en une table aspirante et tournante 75 pour présenter soit dans un sac déjà formé soit dans un sac en cours de formation, une paire de renforts 9 à proximité des bords libres 20 (figure 19) des parois 2 du sac disposées à plat, des moyens 76 connus en soi pour fixer par exemple par une soudure un renfort 9 de chaque paire à une paroi 2 du sac, des moyens 77, tels que des tiges de pliage pour former un pli 6 le long du bord libre 20 précité de chaque paroi, des moyens 78, par exemple d'autres tiges de pliage, pour rabattre ce pli 6 sur la paroi correspondante afin que chaque renfort 9 soit situé entre la paroi 2 et ce pli 6, des moyens 79 pour fixer ce pli 6, par exemple par une soudure 13, à la paroi correspondante, des moyens 80 pour pratiquer une découpe 5, comme un couteau animé d'un mouvement d'approche et de mise en contact avec les parois 2, en leur zone renforcée 3, et de retrait après découpe.An installation according to the invention comprises (FIGS. 17 and 18) means known per se consisting for example of a suction and rotating table 75 for presenting either in a bag already formed or in a bag being formed, a pair of reinforcements 9 near the free edges 20 (FIG. 19) of the walls 2 of the bag arranged flat, means 76 known per se for fixing, for example by welding, a reinforcement 9 of each pair to a wall 2 of the bag, means 77, such as folding rods to form a fold 6 along the aforementioned free edge 20 of each wall, means 78, for example other folding rods, for folding this fold 6 onto the corresponding wall so that each reinforcement 9 is located between wall 2 and this fold 6, means 79 for fixing this fold 6, for example by a weld 13, to the corresponding wall, means 80 for making a cut 5, like a knife driven by an approach movement and bringing them into contact with the walls 2, in their zone reinforced 3, and removal after cutting.

Dans le cas de sacs en cours de formation (figures 17 et 18), l'installation décrite ci-après est prévue pour réaliser des sacs à soudures latérales et elle comprend avantageusement, pour renforcer la zone 3 des parois 2, des moyens 81 pour animer le ruban 51 d'un mouvement de translation en pas à pas (par exemple par un système à crémaillère ou à secteur actionné par un dispositif avec bielle et manivelle) ou en continu (par exemple par un ou des moteurs à commande électronique), des moyens 75 pour présenter les renforts par paires, comme la table tournante et aspirante déjà citée, transversalement audit axe longitudinal, le long des deux bords 52' longitudinaux libres du ruban 51, des moyens 76 pour fixer un renfort 9 de chaque paire audit ruban, le long de chacun de ses bords libres 52' longitudinaux. Ces derniers moyens peuvent être des systèmes de soudage par chaleur et pression ou encore des dispositifs d'encollage des renforts et d'appication des renforts encollés sur le ruban 51. Cette installation comporte encore des moyens 77 pour former un pli 6 le long de chacun des bords 52' et des moyens 78 pour rabattre ce pli 6 sur la paroi correspondante pour que les renforts 9 soient situés entre le pli rabattu 6 sur la paroi et cette dernière. Ces moyens 77 et 78 sont constitués, lorsque ce pliage est fait pendant un mouvement continu du ruban 51, de tiges de pliage, de plaques de pliage et de rouleaux guidant les parois et les plis. Il y a encore, dans cette installation, des moyens 79 pour fixer les plis rabattus 6 à leur paroi correspondante, par une soudure continue, pendant le mouvement continu du ruban ou par une soudure alternative si le ruban est déplacé en pas à pas, des moyens 80 équipés d'un couteau dont la forme peut être choisie en fonction de la forme de découpe que l'on veut réaliser pour les poignées, et des moyens 82 comportant au moins un élément chauffé pour réaliser, par chaleur et par pression, la soudure des bords latéraux 17 des sacs en formation perpendiculairement à la direction de déplacement du ruban 51 et des moyens 82' associés aux moyens pour souder les bords latéraux, comme un couteau logé entre deux éléments chauffés pour la soudure, et detinés à séparer un sac forme d'un sac en formation. Les moyens 82 pour réaliser la soudure et les moyens pour réaliser la séparation peuvent n'être qu'un seul élément chauffé, disposé perpendiculairement à la direction de déplacement du ruban 51, pour souder et pour séparer. Ces deux moyens pour souder les bords latéraux et pour séparer un sac formé sont animés d'un mouvement de va-et-vient pour qu'ils soient en contact avec le ruban 51 à chaque arrêt de celui-ci et pour qu'ils s'en écartent avant que le ruban 51 ne soit remis en mouvement par le pas à pas.In the case of bags being formed (FIGS. 17 and 18), the installation described below is provided for making bags with lateral welds and it advantageously comprises, to reinforce the zone 3 of the walls 2, means 81 for animate the ribbon 51 with a translational movement in step by step (for example by a rack or sector system actuated by a device with connecting rod and crank) or continuously (for example by one or more motors with electronic control), means 75 for presenting the reinforcements in pairs, such as the rotary and suction table already mentioned , transversely to said longitudinal axis, along the two free longitudinal edges 52 ′ of the ribbon 51, means 76 for fixing a reinforcement 9 of each pair to said ribbon, along each of its free longitudinal edges 52 ′. These latter means can be heat and pressure welding systems or devices for gluing the reinforcements and for applying the reinforcements glued to the tape 51. This installation also includes means 77 for forming a fold 6 along each. edges 52 'and means 78 for folding this fold 6 over the corresponding wall so that the reinforcements 9 are situated between the folded fold 6 on the wall and the latter. These means 77 and 78 consist, when this folding is done during a continuous movement of the ribbon 51, of folding rods, folding plates and rollers guiding the walls and the folds. There are also, in this installation, means 79 for fixing the folded folds 6 to their corresponding wall, by a continuous weld, during the continuous movement of the ribbon or by an alternative weld if the ribbon is moved step by step, means 80 equipped with a knife, the shape of which can be chosen as a function of the form of cutout which it is desired to make for the handles, and means 82 comprising at least one heated element for carrying out, by heat and by pressure, the welding of the lateral edges 17 of the bags in formation perpendicular to the direction of movement of the tape 51 and of the means 82 ′ associated with the means for welding the lateral edges, like a knife housed between two heated elements for welding, and intended to separate a bag shape of a bag in formation. The means 82 for carrying out the welding and the means for carrying out the separation may be only one heated element, arranged perpendicular to the direction of movement of the tape 51, for welding and for separating. These two means for welding the lateral edges and for separating a formed bag are moved back and forth so that they are in contact with the tape 51 at each stop of the latter and so that they deviate from it before the ribbon 51 is set in motion by the step by step.

Une forme de réalisation avantageuse de l'installation suivant l'invention, pour la fabrication de sacs à soudures latérales comprend des moyens 83 tels que des rouleaux caoutchoutés motorisés agencés pour entraîner pas à pas, suivant une direction parallèle à son axe longitudinal, un ruban 51 de matière plastique formé de deux épaisseurs 52 superposées. Un pas donné par cet entraînement correspond à la dimension L du sac à fabriquer. L'installation comprend encore, en 54, des moyens non représentés consistant par exemple en des tiges, pour écarter les deux épaisseurs 52 l'une de l'autre, sur une distance supérieure à la dimension A des renforts, afin que les moyens 75 qui introduisent les renforts 9 entre les épaisseurs 52 le fassent sans que les renforts 9 et ou les épaisseurs 52 ne se gênent et ne se déforment en étant poussés l'un contre l'autre. Ces derniers moyens 75 sont constitués par une table tournante et aspirante capable de transporter au moins un renfort sur chacune de ses faces et alimentée en renforts par un dispositif connu en soi. Les renforts étant avantageusement réalisés en une matière thermosoudable, des moyens 76 pour souder un renfort de chaque paire à l'épaisseur 52 correspondante sont associés aux moyens d'introduction pour que le renfort soit soudé à la paroi à chaque arrêt du pas à pas entraînant le ruban. Ces moyens 76 de fixation par soudure comportent un élément chauffé que l'on presse contre le ruban et le renfort pour les fondre ensemble au moins suivant des lignes de soudure réparties sur une surface importante du renfort. En aval de ces moyens pour souder les renforts suivant le sens de déplacement du ruban 51, des moyens 84, tels que rouleaux d'entraînement motorisés, sont prévus pour communiquer un mouvement continu à vitesse constante au ruban 51 et dans le même sens que le mouvement pas à pas. Pendant ce déplacement continu, des moyens 77 forment un pli 6 le long de chaque bord libre 52' des épaisseurs 52 et d'autres moyens 78 rabattent ces plis 6, formés par les moyens 77 et garnis des renforts 9, sur les faces 12 des épaisseurs 52 pour que les renforts soient situés entre ces plis 6 et la face 12 correspondante. Chacun de ces plis 6 est soudé en continu, pendant le mouvement continu du ruban 51, par des moyens 85 qui consistent par exemple en des éléments chauffés et cintrés 61 rayonnant chacun une chaleur suffisante vers une épaisseur et son pli associé, suivant une ligne parallèle à l'axe longitudinal du ruban 51, les épaisseurs et leur pli étant tendu sur un cylindre de passage 60' dont le diamètre est assorti au rayon de cintrage des éléments 61 pour créer un entrefer déterminé entre un élément 61 et un cylindre. Cette opération est effectuée pour chacun des deux plis 6. Ensuite, le ruban 51 passe par des moyens 85' tels que des rouleaux caoutchoutés motorisés pour conférer un mouvement de pas à pas audit ruban 51. Le pas de ce nouveau mouvement est de même amplitude que celui du mouvement pas à pas décrit au début de cette installation. Des moyens 80 donnent un mouvement de va-et-vient à un couteau 65 pour que celui-ci pratique la découpe 5 lorsque le ruban 51 est arrêté par le mouvement pas à pas fourni par les moyens 85' et pour que le couteau se retire avant que ces moyens 85' mettent à nouveau en mouvement le ruban 51 pour avancer celui-ci d'un pas. Comme déjà dit, on peut avoir des couteaux de formes différentes en fonction de la forme de découpe 5 souhaitée.An advantageous embodiment of the installation according to the invention, for the manufacture of bags with lateral welds comprises means 83 such as motorized rubberized rollers arranged to drive step by step, in a direction parallel to its longitudinal axis, a ribbon 51 of plastic formed from two superimposed thicknesses 52. A step given by this training corresponds to the dimension L of the bag to be manufactured. The installation also includes, at 54, means not shown, consisting for example of rods, for spreading the two thicknesses 52 from one another, over a distance greater than the dimension A of the reinforcements, so that the means 75 which introduce the reinforcements 9 between the thicknesses 52 do so without the reinforcements 9 and or the thicknesses 52 interfering and deforming by being pushed one against the other. These latter means 75 consist of a rotary and suction table capable of transporting at least one reinforcement on each of its faces and supplied with reinforcements by a device known per se. The reinforcements being advantageously made of a heat-weldable material, means 76 for welding a reinforcement of each pair to the corresponding thickness 52 are associated with the introduction means so that the reinforcement is welded to the wall at each stop of the resulting stepping step tape. These means 76 for fixing by welding comprise a heated element which is pressed against the strip and the reinforcement to melt them together at least along weld lines distributed over a large surface of the reinforcement. Downstream of these means for welding the reinforcements in the direction of movement of the ribbon 51, means 84, such as motorized drive rollers, are provided to communicate a continuous movement at constant speed to the ribbon 51 and in the same direction as the step by step movement. During this continuous movement, means 77 form a fold 6 along each free edge 52 'of thicknesses 52 and other means 78 fold these folds 6, formed by means 77 and lined with reinforcements 9, on the faces 12 of thicknesses 52 so that the reinforcements are located between these folds 6 and the corresponding face 12. Each of these folds 6 is welded continuously, during the movement continuous of the ribbon 51, by means 85 which consist for example of heated and curved elements 61 each radiating sufficient heat towards a thickness and its associated ply, along a line parallel to the longitudinal axis of the ribbon 51, the thicknesses and their fold being stretched over a passage cylinder 60 'whose diameter matches the radius of bending of the elements 61 to create a determined air gap between an element 61 and a cylinder. This operation is carried out for each of the two plies 6. Next, the ribbon 51 passes by means 85 ′ such as motorized rubberized rollers to impart a step-by-step movement to said ribbon 51. The pitch of this new movement is of the same amplitude than that of the step by step movement described at the beginning of this installation. Means 80 give a movement back and forth to a knife 65 so that it performs cutting 5 when the tape 51 is stopped by the stepwise movement provided by the means 85 'and so that the knife is withdrawn before these means 85 'set the ribbon 51 in motion again to advance it one step. As already said, it is possible to have knives of different shapes depending on the desired cut shape.

Grâce à ce mouvement pas à pas, on a une avance de la matière et un arrêt de celle-ci qui sont cycliques et qui permettent à des moyens 82 de réaliser la soudure des bords latéraux des sacs et à des moyens associés 82' de faire la séparation des sacs au fur et à mesure qu'ils sont formés. Ces soudures et cette séparation ont été expliqués ci-dessus. Comme déjà dit, ces soudures et cette séparation formant les bords latéraux 17 des sacs sont réalisées à mi-distance entre deux paires de découpes 5 immédiatement voisines. Elles peuvent cependant être réalisées, toujours entre ces découpes, mais pour que, dans un sac formé, la découpe 5 soit décalée par rapport aux bords latéraux 17 (figure 16).Thanks to this step by step movement, there is a material advance and a stop thereof which are cyclic and which allow means 82 to perform the welding of the side edges of the bags and associated means 82 'to make separation of the bags as they are formed. These welds and separation have been explained above. As already said, these welds and this separation forming the lateral edges 17 of the bags are made midway between two pairs of immediately adjacent cutouts 5. They can however be produced, always between these cutouts, but so that, in a formed bag, the cutout 5 is offset with respect to the lateral edges 17 (FIG. 16).

Une forme de réalisation particulièrement avantageuse de l'installation suivant l'invention comprend, pour la fabrication de sacs à soudures latérales suivant les figures 12, 14 et 16, les mêmes moyens que ceux définis pour l'installation ci-dessus, jusque et y compris ceux qui fixent le renforts 9. Cette autre forme de réalisation de l'installation comprend donc les moyens 83 pour entraîner pas à pas le ruban 51 en double épaisseur les moyens non représentés pour écarter en 54 les deux épaisseurs 52 l'une de l'autre, les moyens 75 pour introduire les renforts 9 entre les épaisseurs 52 et les moyens 76 pour souder les renforts 9 à l'épaisseur 52 correspondante. En aval de ces moyens pour souder les renforts 9, le mouvement pas à pas est conservé, pour présenter le ruban en double épaisseur aux moyens qui suivent. Le ruban 51 est amené en pas à pas à des moyens 77 qui forment un pli le long du bord libre (52') des deux épaisseurs 52 du ruban 51. Ces moyens peuvent être des tiges disposées sur le passage desdits bords libres au cas où l'on forme ces plis pendant le mouvement du pas à pas. Ces moyens 77 peuvent être des pièces marquant le pli à l'arrêt du pas à pas. Des moyens 78 rabattent les deux plis 6 ainsi formés sur l'épaisseur correspondante 52 soit pendant le mouvement du pas à pas, au cas où ils peuvent consister en des tiges déformant le bord pour rabattre le pli, soit pendant l'arrêt du pas à pas, par exemple si ces moyens sont des pinces qui à chaque arrêt prennent les plis pour les rabattre sur l'épaisseur correspondante. Toujours en pas à pas, le ruban est amené aux moyens 79 qui soudent les plis 6 à l'épaisseur correspondante à chaque arrêt du pas à pas. Ces moyens consistent généralement en deux éléments chauffés chacun étant appuyé à chaque arrêt du ruban 51, contre un pli 6 et l'épaisseur correspondante pour les souder et former la soudure 13; les éléments sont mis à l'écart du pli et de l'épaisseur avant que le ruban soit remis en mouvement. Le mouvement pas à pas amène la zone de renforcement des épaisseurs 52 du ruban 51 à l'endroit des moyens 80. A partir de ces moyens 80 pour pratiquer la découpe 5 dans les zones de renforcement 3, la description est identique à celle de l'installation précédente.A particularly advantageous embodiment of the installation according to the invention comprises, for the manufacture of bags with lateral welds according to FIGS. 12, 14 and 16, the same means as those defined for the above installation, up to and including including those which fix the reinforcements 9. This other embodiment of the installation therefore comprises the means 83 for driving the ribbon 51 in double thickness step by step, the means not shown for spreading the two thicknesses 52 at 54 from one another, the means 75 for introducing the reinforcements 9 between the thicknesses 52 and the means 76 for welding the reinforcements 9 to the corresponding thickness 52. Downstream of these means for welding the reinforcements 9, the step-by-step movement is preserved, in order to present the strip in double thickness to the means which follow. The ribbon 51 is brought in step by step to means 77 which form a fold along the free edge (52 ′) of the two thicknesses 52 of the ribbon 51. These means can be rods placed on the passage of said free edges in case these folds are formed during the movement of the step by step. These means 77 can be parts marking the fold at the stop of the step by step. Means 78 fold the two folds 6 thus formed over the corresponding thickness 52 either during the movement of the step by step, in case they may consist of rods deforming the edge to fold the fold, or during the stopping of the step at not, for example if these means are pliers which at each stop take the folds to fold them over the corresponding thickness. Still in step by step, the ribbon is brought to the means 79 which weld the folds 6 to the thickness corresponding to each stop of the step by step. These means generally consist of two heated elements, each being pressed at each stop of the strip 51, against a fold 6 and the corresponding thickness for welding them and forming the weld 13; the elements are put away from the fold and the thickness before the ribbon is set in motion. The step-by-step movement brings the area for reinforcing the thicknesses 52 of the ribbon 51 to the location of the means 80. From these means 80 for cutting 5 in the reinforcement areas 3, the description is identical to that of the previous installation.

Un autre mode de réalisation particulièrement avantageux de l'installation comprend (figure 21) des moyens pour entraîner en continu, suivant son axe longitudinal, un ruban 70 en simple épaisseur, par exemple enroulé sur une bobine non représentée. Le ruban 70 est ainsi amené en 71 en regard de moyens connus qui présentent, transversalement audit axe longitudinal, des paires de renforts, un renfort 9 de chaque paire étant disposé à proximité d'un des bords libres 52'. Des moyens non représentés, tels qu'un compte-mètre ou un compteur d'impulsions et un encodeur, sont disposés pour mesurer le passage d'une longueur de ruban 70 correspondant à la dimension L d'un sac, prise parallèlement à l'axe longitudinal précité. Quand ces moyens détectent le passage d'une longueur L, d'une part, ils se remettent à zéro pour mesurer une nouvelle longueur identique et, d'autre part, ils donnent à chaque détection, un signal que l'on exploite pour communiquer, à chaque renfort de chaque paire une vitesse égale à la vitesse du ruban 70 dans le même sens et dans la même direction que ce dernier par des moyens non représentés, par exemple constitués par des rouleaux caoutchoutés entraînés momentanément à chaque signal, et pour fixer par des moyens non représentés chaque renfort à l'épaisseur simple de matière. Le renfort, étant par exemple enduit de colle, sera appliqué sur le ruban par ces moyens de fixation qui peuvent être un élément applicateur et presseur. Ces moyens communiquant une vitesse aux renforts 9 et ces moyens de fixation sont disposés et agencés pour que les renforts d'une même paire soient en regard l'un de l'autre. Le ruban étant toujours entraîné en continu, on forme des plis le long de ses deux bords libres 52', en 72, à l'aide de tiges de pliage agencées sur le passage desdits bords libres. Des tiges complémentaires rabattent en 73 les plis 6 formés sur le ruban 70 en simple épaisseur de manière que les renforts 9 fixés le long des bords libres soient situés entre leur pli correspondant et l'épaisseur simple de matière. Le ruban étant animé d'un mouvement continu, un dispositif de soudure en long en continu tel que déjà décrit sera avantageusement utilisé pour fixer en 74 chaque pli 6 a l'épaisseur simple. Pour mémoire, ce dispositif comporte en général un cylindre de passage 60' et un élément chauffé et cintré 61 par pli à souder. Dans le cas présent, un seul cylindre de passage 60' suffit et l'on positionne un élément chauffé et cintré 61 à l'endroit de chacune des deux fixations, d'un pli et de l'épaisseur, à réaliser par soudure. Lorsque les plis 6 sont fixés par une soudure 13 à l'épaisseur 70, celle-ci est pliée en deux en 71' le long de son axe longitudinal par un dispositif de plage connu comprenant un triangle de pliage et des rouleaux pinceurs.Another particularly advantageous embodiment of the installation comprises (FIG. 21) means for continuously driving, along its longitudinal axis, a ribbon 70 of single thickness, for example wound on a reel not shown. The ribbon 70 is thus brought at 71 opposite known means which have, transversely to said longitudinal axis, pairs of reinforcements, a reinforcement 9 of each pair being disposed near one of the free edges 52 '. Means not shown, such as a meter or a pulse counter and an encoder, are arranged to measure the passage of a length of tape 70 corresponding to the dimension L of a bag, taken parallel to the abovementioned longitudinal axis. When these means detect the passage of a length L, on the one hand, they reset to zero to measure a new identical length and, on the other hand, they give each detection, a signal that is used to communicate , at each reinforcement of each pair, a speed equal to the speed of the ribbon 70 in the same direction and in the same direction as the latter by means not shown, for example constituted by rubberized rollers momentarily driven at each signal, and to fix by means not shown each reinforcement to the simple thickness of material. The reinforcement, for example being coated with adhesive, will be applied to the tape by these fixing means which may be an applicator and pressure element. These means communicating a speed to the reinforcements 9 and these fixing means are arranged and arranged so that the reinforcements of the same pair are opposite one another. The ribbon being always driven continuously, folds are formed along its two free edges 52 ', at 72, using folding rods arranged on the passage of said free edges. Complementary rods fold at 73 the folds 6 formed on the ribbon 70 in single thickness so that the reinforcements 9 fixed along the free edges are located between their corresponding fold and the simple thickness of material. The ribbon being driven by a continuous movement, a continuous long welding device as already described will advantageously be used to fix at 74 each ply 6 to the simple thickness. For the record, this device generally comprises a passage cylinder 60 ′ and a heated and curved element 61 by fold to be welded. In the present case, a single passage cylinder 60 ′ is sufficient and a heated and curved element 61 is positioned at the location of each of the two fixings, of a fold and of the thickness, to be produced by welding. When the folds 6 are fixed by a weld 13 to the thickness 70, the latter is folded in half at 71 'along its longitudinal axis by a device of known range comprising a folding triangle and pinch rollers.

Le ruban 70 plié pour former un ruban en double épaisseur 51 est ensuite animé d'un mouvement pas à pas, dans le même sens que le mouvement continu précité, par des moyens tels que ceux portant la référence 85' à la figure 17 et qui consistent en des rouleaux caoutchoutés commandés en pas à pas par exemple par un secteur ayant un mouvement de va-et-vient.The ribbon 70 folded to form a double thickness ribbon 51 is then animated with a step-by-step movement, in the same direction as the above-mentioned continuous movement, by means such as those bearing the reference 85 'in FIG. 17 and which consist of rubberized rollers controlled step by step for example by a sector having a reciprocating movement.

Ce mouvement de pas à pas est exploité pour réaliser à chacun de ses arrêts, les opérations pratiquant la découpe 5, formant la soudure des bords 17 et effectuant la séparation d'un sac formé. Les moyens utilisés pour ces opérations ont déjà été décrits ci-dessus.This step-by-step movement is used to carry out, at each of its stops, the operations practicing cutting 5, forming the welding of the edges 17 and effecting the separation of a formed bag. The means used for these operations have already been described above.

Claims (19)

  1. A bag (1) made of thermoweldable plastic material, the two walls (2) of which are each provided in a zone (3) near the opening (4) of said bag with at least one cut (5) serving as handle, each of said walls (2) comprises in this zone a reinforcement formed, on the one hand, by a turning (6) folded back onto the wall and forming one of the edges (7) of the bag opening, this turning being arranged to have its free edge (8) situated between said cut and the bottom (14) of the bag and, on the other hand, by a strengthening piece (9) formed by a portion of flat material joined to the bag between said turning and said wall, the position and the dimensions of the strengthening piece being such that said cut (5) is completely situated in this strengthening piece (9), the turning (6) folded back onto the wall (2) being fixed by welding or gluing to the latter, along its free edge (8), characterized in that said strengthening piece (9) is fixed by gluing or welding over at least an important portion of its surface, in the zone thereof surrounding the cut (5), either to the side of the folded back turning (6) facing the corresponding wall (2), or to this wall facing said turning, the folded back turning being fixed to the corresponding wall (2) over a distance which is at least equal to the dimension of the cut taken parallel to the bottom (14) of the bag.
  2. A bag according to claim 1, characterized in that the turning (6) is folded back onto the inner side (12) of the corresponding bag wall when the strengthening piece (9) is fitted onto said side of the turning (6).
  3. A bag according to claim 1, characterized in that the turning (6) is folded back onto the outer side (11) of the corresponding bag wall when the strengthening piece (9) is fitted onto said wall (2) of the bag.
  4. A bag according to any one of the claims 1 to 4, characterized in that the strengthening piece (9) has a dimension (B), taken perpendicular to the bottom of the bag, sufficient for said strengthening piece to be fixed to the wall (2) and to the turning (6), at the place (13) where this wall and this turning are fixed to each other.
  5. A bag according to any one of the claims 1 to 4, characterized in that the dimension (B) of the strengthening piece (9), taken perpendicular to the edges (7) of the bag opening is smaller than the distance separating said edges (7) from the welds (13) which fix the turnings (6) to the corresponding walls (2) of the bag, said strengthening piece being joint in such a manner to the wall and to the turning, which form each of said reinforcement zones (3) of the bag, that it is situated at a distance of the weld (13) fixing this turning and wall.
  6. A bag according to any one of the claims 1 to 5, characterized in that it comprises at least two welds (16) for fixing to each wall (2) the corresponding turning (6) which is folded back onto the latter, which welds are situated at both sides of said cut (5) and extend transversely to the edges (7) of the bag opening, and are made either outside the strengthening piece (9) or through the latter.
  7. A bag according to any one of the claims 1 to 6, characterized in that its bottom (14) is formed by at least one fold (13') of the plastic material forming the bag walls (2), these walls and the turnings (6) being fixed to each other by means of a weld (18) along each of their corresponding edges (17) which are contiguous to said bottom.
  8. A method for manufacturing a bag (1) made of thermoweldable plastic material according to any one of the claims 1 to 7, characterized in that it consists in bringing (in 55), either in a bag already formed or during the forming of a bag, near the free edges (21) of the flat disposed bag walls, a pair of said strengthening pieces (9), fixing simultaneously by gluing or welding over at least an important portion of its surface a strengthening piece (9) to each wall (2), forming simultaneously (in 57) said turning (6) on each bag wall, folding the turnings simultaneously back (in 58') onto their corresponding wall (2) in such a manner that each strengthening piece is situated, over at least an important part of its surface, between the wall (2) and the corresponding folded back turning (6), fixing (in 59 or 60) said free edges (8) of the folded back turnings simultaneously to their corresponding wall (2) over a distance which is at least equal to the dimension of said cuts (5) taken parallel to the bottom (14) of the bag and making simultaneously (in 64) said cuts in the two bag walls, in their reinforced zone (3) formed by the wall (2), the strenghtening piece (9) and the turning (6) folded back onto the wall.
  9. A method for manufacturing a bag made of thermoweldable plastic material according to claim 8, characterized in that it consists, for reinforcing the bags (1) during their manufacture, in moving step by step (in 50) and according to its longitudinal axis a ribbon (51) made of plastic material and formed by two superimposed sheets (52) which are joined together by a fold (53) forming one of the longitudinal edges of the ribbon and destined to form the bottoms (14) of the bags, each step corresponding to the dimension (L) of a bag to be manufactured taken parallel to said fold (53), separating the two sheets (52) forming the ribbon (51) from each other, introducing (in 55) at each step, when the ribbon is either in motion or at rest, between the two separated sheets, transversely to the longitudinal axis of the ribbon, a pair of strengthening pieces (9), the dimension (A) of which taken parallel to said fold (53) is smaller than said step, fixing during each stop by gluing or welding a strengthening piece (9) over at least an important portion of its surface to the corresponding sheet (52) along its free edge (52') opposite to said fold, transforming (in 56) the step by step movement of the ribbon (51) into a continuous movement according to its longitudinal axis and in the same direction as the step by step movement, forming (in 57) during the continuous movement of the ribbon, a turning (6) along each free edge of the sheets of said ribbon in such a manner that the dimension (C) of this turning, taken perpendicularly to the longitudinal axis of the ribbon is larger than the distance between the farthest edge (58) of a strengthening piece (9) and said free edge (52') of the corresponding sheet, folding back (in 58') during the continuous movement of said ribbon, the formed turnings (6) onto the sides (12) of said sheets which are facing each other, transforming (in 62) the continuous movement in a step by step movement according to the same direction and sense as those of the continuous movement and the step of which is equal to the step of said step by step movement, fixing by weld (13) the free edges (8) of the turnings folded back onto the sheets (52) made of plastic material parallel to said edges (8), either during said continuous movement (in 59) or (in 60) at each stop of said latter step by step movement, in such a manner that this weld (13) is situated either outside the strengthening pieces or situated in the strengthening pieces for fixing each of the latter pieces to the corresponding folded back turning (6) and sheet (52), making (in 64) at each stop of the ribbon (51), in a zone (3) of each of the sheets of the ribbon which is lined by the folded back turning and the strengthening piece (9), said cut (5) and, at each stop of the ribbon, linking (in 66) the two sheets (52) of the latter by a weld (18) perpendicular to the movement direction of the ribbon in order to form the two lateral, contiguous edges (17) of two successively manufactured bags and separating (in 66) the manufactured bag (1) from the bag directly adjoining during manufacture between said lateral edges (17), this weld (18) being realized between two pairs of cuts (5), either symmetrically or asymmetrically with respect to the latter.
  10. A method for manufacturing a bag made of thermoweldable plastic material according to claim 8, characterized in that it consists , for reinforcing the bags (1) during their manufacture, in moving step by step (in 50) and according to its longitudinal axis a ribbon (51) made of plastic material and formed by a two superimposed sheets (52) which are joined together by a fold (53) forming one of the longitudinal edges of the ribbon and destined to form the bottoms (14) of the bags, each step corresponding to the dimension (L) of a bag to be manufactured taken parallel to said fold (53), separating the two sheets (52) forming the ribbon from each other, introducing (in 55) at each step, when the ribbon (51) is either in motion or at rest, between the two separated sheets, transversely to the longitudinal axis of the ribbon, a pair of strengthening pieces (9), the dimension (A) of which taken parallel to said fold (53) is smaller than said step, fixing during each stop by gluing or welding a strengthening piece over at least an important portion of its surface to the corresponding sheet (52) along its free edge (52') opposite to said fold, forming (in 57), either during the movement of the ribbon or when it is at rest, a turning (6) along each free edge (52') of the sheets of said ribbon in such a manner that the dimension (C) of this turning, taken perpendicularly to the longitudinal axis of the ribbon is larger than the distance between the farthest edge (58) of a strengthening piece (9) and said free edge (52') of the corresponding sheet, folding back (in 58') either during the movement of said ribbon or when the latter is at rest, the formed turnings (6) onto the sides (12) of said sheets (52) which are facing each other, fixing (in 60) by weld (13) the free edges (8) of the turnings folded back onto the sheets made of plastic material in a direction parallel to said edges, at each stop of said step by step movement, in such a manner that this weld (13) is situated either outside the strengthening pieces (9) or situated on the strengthening pieces for fixing each of the latter pieces to the corresponding folded back turning (6) and sheet (52), making (in 64) at each stop of the ribbon (51), in a zone (3) of each of the sheets of the ribbon which is lined by the folded back turning and the strengthening piece, said cut (5) and, at each stop of the ribbon, linking (in 66) the two sheets (52) of the latter by a weld (18) perpendicular to the movement direction of the ribbon in order to form the two lateral, contiguous edges (17) of two successively manufactured bags and separating (in 66) the manufactured bag (1) from the bag directly adjoining during the manufacture between said lateral edges (17), this weld (18) being realized between two pairs of cuts (5), either symmetrically or asymmetrically with respect to these latter cuts.
  11. A method for manufacturing a bag made of thermoweldable material according to either one of the claims 9 and 10, characterized in that the weld (13) (in 60) of the turning (6) folded back onto the corresponding sheet (52) and said cut (5) are made simultaneously in each sheet at each stop of said step by step movement.
  12. A method for manufacturing a bag made of thermoweldable material according to claim 9, characterized in that the weld (13) of the turning (6) folded back onto the corresponding sheet (52) is continuously realized (in 59) during said continuous movement of the ribbon.
  13. A method for manufacturing a bag made of thermoweldable material according to any one of the claims 9 to 12, characterized in that said two sheet (52) ribbon (51) is formed starting from a one sheet ribbon (70) which is continuously drawn along according to its longitudinal axis, this continuous movement is transformed into a step by step movement for applying (in 71), in pairs, said strengthening pieces (9) along the longitudinal edges (52') of the one sheet ribbon and the strengthening pieces are fixed to this latter ribbon by gluing or welding over at least an important portion of their surface at each stop of this step by step movement, after fixing the strengthening pieces (9) the latter movement is transformed into a continuous movement for transforming (in 71') by folding the one sheet ribbon (70) into a two sheet ribbon (51), said movements being carried out in the same direction.
  14. A method for manufacturing a bag made of thermoweldable material according to any one of the claims 9 tot 12, characterized in that said two sheet (52) ribbon (51) is formed starting from a one sheet ribbon (70) which is continuously drawn along according to its longitudinal axis, the strengthening pieces (9) are brought (in 71) in pairs along the free edges (52') of the ribbon, transversely to said longitudinal axis and each time the passage of a ribbon length, equal to the dimension (L) of a bag taken parallel to the fold (13') forming the bottom of said bag, is detected, a speed substantially equal to the ribbon speed is imparted successively to each strengthening piece (9) of each pair in the same direction and sense as said ribbon (70) and the strengthening pieces are fixed by gluing or welding over at least an important portion of their surface to the single sheet of material in such a manner that the strengthening pieces situated along one edge are equidistant and that the strengthening pieces (9) of a same pair are opposite each other, a turning (6) is formed along each of the two free edges (52') of the one sheet ribbon in such a manner that the dimension of that turning, taken perpendicularly to the longitudinal ribbon axis, is larger than the distance between the farthest edge (58) of a strengthening piece (9) and said corresponding free edge (52'), the formed turnings (6) are folded back onto the side of said sheet in such a manner that said strengthening pieces are situated between these turnings and said side, the formed turnings are fixed to the corresponding sheet by means of said continuous weld (13) along their free edge (8) in such a manner that this weld is situated either outside the strengthening pieces (9) or on the strengthening pieces in order to fix them to the folded back turning (6) and to said corresponding sheet, then the one sheet ribbon (70) is folded (in 71') substantially according to its longitudinal axis so as to form a double sheet ribbon (51) wherein the strengthening pieces (9) of a same pair are superimposed.
  15. An installation for carrying out a method according to any one of the claims 8 to 14, characterized in that it comprises means (75) for bringing, either in a bag already formed or during the manufacture of a bag, a pair of strengthening pieces (9) near the free edges (21) of the flat disposed bag walls (2), means (76) arranged for fixing by gluing or welding over an important portion of its surface a strengthening piece to a wall (2), means (77) for forming (in 57) a turning (6) along said free edge (21) of each wall, means (78) for folding this turning back onto the corresponding wall (2) in such a manner that each strengthening piece (9) is situated between the wall and this folded back turning, means (79) for fixing this turning to the corresponding wall, means (80) for making a cut (5) in the zone (3) of each of the two walls reinforced by said folded back turning and said strengthening piece.
  16. An installation according to claim 15, characterized in that it comprises, for reinforcing the bags (1) during their manufacture, means (81) for imparting a translation movement to the plastic ribbon (51) according to its longitudinal axis, means (75) for bringing the strengthening pieces (9), in pairs, transversely to said longitudinal axis, along the two free longitudinal edges (52') of the ribbon, means (76) for fixing a strengthening piece of each pair to said ribbon along each of its above mentioned free longitudinal edges (52'), means (77) for forming a turning (6) along each of these latter edges, means (78) for folding this turning back onto the corresponding wall in such a manner that each strengthening piece is situated between this wall and the corresponding folded back turning, means (79) for fixing the folded back turning to the corresponding side of the ribbon, means for making a cut (80) through the zone (3) reinforced by the turning and the strengthening pieces of the two bag walls, means (82) for forming by welding the lateral edges (17) of the bags being manufactured and means (82') linked to these latter means for separating a manufactured bag from a bag still being manufactured.
  17. An installation according to claim 16, characterized in that it comprises means (83) provided, on the one hand, for driving said plastic ribbon (51), formed by two superimposed sheets (52), step by step in a direction parallel to its longitudinal axis and provided, on the other hand, in such a manner that one step corresponds to the dimension (L) of a bag to be manufactured taken parallel to the longitudinal axis of the ribbon, means provided (in 54) for separating these two sheets from each other over a distance larger than the dimension (A) of said strengthening pieces taken parallel to the longitudinal axis of the ribbon, means (75) provided for introducing a pair of thermoweldable strengthening pieces (9) between the separated sheets, means (76) linked to these latter means (75) and provided for fixing at each stop of the ribbon by welding one strengthening piece of each pair to the corresponding ribbon sheet (52), means (84) disposed downstream the fixation place of the strengthening pieces when considering the displacement direction of the ribbon and provided for transforming the step by step movement of the latter into a continuous movement with a substantially constant speed, means (77 and 78) disposed on the course of the ribbon on both sides of the latter and provided, on the one hand, for forming during the continuous movement of the ribbon a turning along each free edge of said sheets and, on the other hand, for folding the formed turnings (6), provided with said strengthening pieces (9), back onto the sides (12) of said sheets facing each other, means (85) provided for continuously welding the folded back turning to the corresponding sheet along its free edge (8) during the continuous movement of the ribbon, means (85') situated downstream the means (85) provided for welding the turnings, and arranged for transforming the continuous movement into a step by step movement in the same direction and sense as the previous step by step movement and with the same step as the latter, means (80) for forming simultaneously, at each stop of the ribbon, a cut (5) in each of said reinforcement zones (3) and means (82) for welding, at each stop of the ribbon, the two sheets of the latter, perpendicularly to the longitudinal axis of the ribbon, which weld forms the contiguous lateral edges (17) of two successively manufactured bags and means (82') linked to the means (82) for welding the lateral edges, for separating the manufactured bag from the bag directly adjoining during manufacture, between their lateral edges (17), these latter means being moreover provided in such a manner that the weld (18) of said lateral edges and said separation are realized simultaneously between two pairs of cuts (5), either symmetrically or asymmetrically with respect to these pairs of cuts.
  18. An installation according to claim 16, characterized in that it comprises means (83) provided, on the one hand, for driving a plastic ribbon, formed by said two superimposed sheets (52), step by step in a direction parallel to its longitudinal axis and provided, on the other hand, in such a manner that one step corresponds to the dimension (L) of a bag to be manufactured taken parallel to the longitudinal axis of the ribbon, means provided (in 54) for separating these two sheets from each other over a distance larger than the dimension of said strengthening pieces taken parallel to the longitudinal axis of the ribbon, means (75) provided for introducing a pair of thermoweldable strengthening pieces between the seperated sheets, means (76) linked to these latter means and provided for fixing at each stop of the ribbon by welding a strengthening piece of each pair to the corresponding ribbon sheet, means (77 and 79) disposed on the course of the ribbon on both sides of the latter and provided, on the one hand, for forming either during the movement of the ribbon or when the matter is at rest a turning (6) along each free edge (52') of said sheets and, on the other hand, for folding the formed turnings, provided with said strengthening pieces (9), back onto the sides (12) of said sheets facing each other, means (79) provided for welding when the ribbon is at rest the folded back turning to the corresponding sheet along its free edge, means (80) for forming simultaneously, at each stop of the ribbon, a cut (5) in each of said reinforcement zones (3) and means (82) for welding, at each stop of the ribbon, the two sheets of the latter, perpendicularly to the longitudinal axis of the ribbon, which weld forms the contiguous lateral edges (17) of two successively manufactured bags between two pairs of cuts (5), either symmetrically or asymmetrically with respect to the latter, and means (82') linked to the means for welding the lateral edges (17), for separating the manufactured bag from the bag directly adjoining during manufacture, between their lateral edges, these latter means (82') being moreover provided in such a manner that the weld (18) of said lateral edges and said separation are realized simultaneously.
  19. An installation according to claim 16, characterized in that it comprises means for continuously driving a single sheet ribbon (70) according to its longitudinal axis, means (in 71) for bringing the strengthening pieces (9) in pairs, transversely with respect to said axis, along the free edges (52') of the ribbon, means for detecting the passage of a length of ribbon (70) equal to the dimension (L) of a bag taken parallel to the longitudinal axis of the ribbon, means for imparting, at each detection of this ribbon length, to each strengthening piece of each pair a speed substantially equal to the ribbon speed, in the same direction and sense as said ribbon, means for fixing the strengthening pieces to the single sheet of material in such a manner that the strengthening pieces situated along one edge are equidistant and that the strengthening pieces of a same pair are opposite each other, means for forming (in 72) a turning (6) along each of the two free edges (52') of the ribbon, means (in 73) for folding the formed turnings back onto the single sheet ribbon in such a manner that said strengthening pieces (9) are situated between these turnings (6) and this ribbon (70), means for continuously welding (in 74) each of the folded back turnings along their free edge (8) to the ribbon, means for folding (in 71') said ribbon substantially along its longitudinal axis for forming a double sheet ribbon (51), means (85') for transforming said continuous driving into a step by step movement in the same direction and sense as said driving, one step being equal to said dimension (L) of a bag, means (80) provided for making simultaneously at each stop of said step by step movement a cut (5) in the reinforcement zone (3) of said two sheets, means (82) provided for welding these two sheets (52), at each stop of the double sheet ribbon (51), perpendicularly to the longitudinal axis of the ribbon in order to form the contiguous lateral edges (17) of two successively manufactured bags between the two pairs of cuts (5) of the latter and either symmetrically or asymmetrically with respect to these cuts and means (82') for separating the manufactured bag from the bag directly adjoining during the manufacture, these latter means, linked to the means (82) for welding the lateral edges, being provided in such a manner that the separation is realized simultaneously to this welding and that it is carried out between the two lateral edges (17) formed by the same welding.
EP90904193A 1989-03-28 1990-03-15 Bag with handles cut out from a reinforced region, process and installation for the production of such bag Expired - Lifetime EP0416063B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE8900344A BE1003043A7 (en) 1989-03-28 1989-03-28 BAG WITH HANDLES CUT INTO AN AREA WITH REINFORCEMENT, METHOD AND INSTALLATION FOR MAKING THIS BAG.
BE8900344 1989-03-28
PCT/BE1990/000012 WO1990011230A1 (en) 1989-03-28 1990-03-15 Bag with handles cut out from a reinforced region, process and installation for the production of such bag

Publications (2)

Publication Number Publication Date
EP0416063A1 EP0416063A1 (en) 1991-03-13
EP0416063B1 true EP0416063B1 (en) 1994-06-15

Family

ID=3884095

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90904193A Expired - Lifetime EP0416063B1 (en) 1989-03-28 1990-03-15 Bag with handles cut out from a reinforced region, process and installation for the production of such bag

Country Status (7)

Country Link
EP (1) EP0416063B1 (en)
AT (1) ATE107252T1 (en)
BE (1) BE1003043A7 (en)
DE (1) DE69009906T2 (en)
DK (1) DK0416063T3 (en)
ES (1) ES2056452T3 (en)
WO (1) WO1990011230A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2296534B1 (en) * 2006-10-02 2009-03-16 Cristobal Meseguer, S.A. PERFECTED CONTINUOUS BAND FOR MANUFACTURE OF BAGS FOR HORTOFRUTICOL AND SIMILAR PRODUCTS.
US9315319B2 (en) 2012-01-25 2016-04-19 The Glad Products Company Continuous process for trash bag with inner bag
US9387955B2 (en) 2012-01-25 2016-07-12 The Glad Products Company Multi-layered thermoplastic bag with reinforced seals and methods of making the same
WO2018070970A2 (en) * 2016-10-12 2018-04-19 Netpak Ambalaj Sanayi̇ Ti̇caret Anoni̇m Şi̇rketi̇ Automated manufacture system for production of three-dimensional bags
DE202017105180U1 (en) * 2017-08-28 2017-11-03 Papier-Mettler Kg Plastic carrying case and carrying loop for a plastic carrier bag

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1778867A1 (en) * 1967-07-01 1972-08-10 Hans Lehmacher Method and device for producing a carrier bag and carrier bag from thermoplastic plastic film
DE1930788A1 (en) * 1969-06-18 1971-01-07 Windmoeller & Hoelscher Carrying bag made of plastic film
DE2121588A1 (en) * 1971-05-03 1972-11-23 Lehmacher, Hans, 5216 Niederkassel Thermoplastic/carrier bag - with stiffened mouth hand holes and fold over closure
GB1529196A (en) * 1976-10-25 1978-10-18 Metal Closures Venus Pack Carrier bags

Also Published As

Publication number Publication date
EP0416063A1 (en) 1991-03-13
DE69009906T2 (en) 1995-01-12
DK0416063T3 (en) 1995-03-27
ATE107252T1 (en) 1994-07-15
WO1990011230A1 (en) 1990-10-04
ES2056452T3 (en) 1994-10-01
BE1003043A7 (en) 1991-11-05
DE69009906D1 (en) 1994-07-21

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