WO2003064146A1 - Procede et appareil pour la fabrication continue de produits en film plastique - Google Patents

Procede et appareil pour la fabrication continue de produits en film plastique Download PDF

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Publication number
WO2003064146A1
WO2003064146A1 PCT/IT2002/000047 IT0200047W WO03064146A1 WO 2003064146 A1 WO2003064146 A1 WO 2003064146A1 IT 0200047 W IT0200047 W IT 0200047W WO 03064146 A1 WO03064146 A1 WO 03064146A1
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WO
WIPO (PCT)
Prior art keywords
web
extruded
bags
plastics film
extruder
Prior art date
Application number
PCT/IT2002/000047
Other languages
English (en)
Inventor
Andrea Federici
Original Assignee
Andrea Federici
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andrea Federici filed Critical Andrea Federici
Priority to PCT/IT2002/000047 priority Critical patent/WO2003064146A1/fr
Publication of WO2003064146A1 publication Critical patent/WO2003064146A1/fr

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Classifications

    • 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
    • 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
    • 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
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • 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
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/813—Applying closures
    • B31B70/8131—Making bags having interengaging closure elements
    • 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
    • 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
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/38—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation
    • B65D81/3888—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation wrappers or flexible containers, e.g. pouches, bags

Definitions

  • the present invention relates in general to the manufacturing of bags, pouches and other similar items, obtained from a film of plastic material, through following phases of folding, joining with longitudinal, lateral, transversal weldings, cutting and similar, until the desired form of the final product is achieved.
  • This kind of manufacturing is the one normally carried out in automated manner with proper apparatus, for industrial production of shopper bags and refuse sacks.
  • the invention concerns the production of bags or pouches with one or more elements of plastic material combined to them, such for example handles like those called “loop handle", a tape to close the mouth of the bag, the reinforcement strips provided in connection with openings near the upper edge of the bags used as grips and others.
  • plastic material elements to be associated to the bags, such as the handles, the strips or tapes for refuse sacks and others, as mentioned above.
  • an object of this invention is to provide a method of continuous manufacturing bags and other similar products made from an extruded plastics film web, in a reliable manner and without the interruptions occurring during known manufacturing processes. This object is achieved by a method whose technical features are set out in the claims appended to this description.
  • the invention also includes an apparatus for carrying out the above ⁇ method, whose features are also claimed herein below.
  • FIG. 1 is a digramatic side view of a first embodiment of apparatus for production of bags, according to the present invention
  • figure 2 shows a section of previous apparatus, taken along the line ll-ll of figure 1 ;
  • FIG. 5 shows a bag produced with the apparatus above
  • figure 6 is an enlarged view of a particular of figure 1 ;
  • figure 9 shows a variation of a part of the apparatus in figurel ;
  • figure 10 shows a variation of another part of the apparatus of figure 1 ;
  • FIG. 11 shows a detail of the processing of a film web according to the invention
  • figure 12 shows a further variation of a part of the apparatus of figure 1 ;
  • FIG. 13 is a perspective view of an insulating bag according to the invention.
  • - figures 14 and 15 are respectively a cross and longitudinal sectional view of the aforesaid insulating bag
  • FIG. 16 is a diagramatic view of an apparatus for continuous manufacturing of the insulating bag of figure 13;
  • the apparatus represented therein is aimed at producing plastics bags of the type with a plastics tape for closing and seizing thereof, arranged at the mouth of the bag as usual for the refuse bags of domestic use.
  • the . above mentioned apparatus is intended for continuous manufacturing of bags starting from raw material, that is the granules of the basic polymer from which the plastics film for production of the final item is extruded.
  • any polymeric material known in the art for producing plastics bags and the other products mentioned above can be used; these materials include the polyolefines such as high or low density polyethylene (HDPE or LDPE), polypropylene and further polymers of different nature.
  • HDPE high or low density polyethylene
  • LDPE low density polyethylene
  • polypropylene polypropylene
  • the plastics film referred to before is produced with at least one extrusion unit 1 , operating in conformity with a technology also called "cast"; some examples of this extrusion technique can be found in the U.S. Patent No. 3,223,757 or in the Italian one No.1187023.
  • Unit 1 includes an extrusion head 10 from which the melted polymeric material comes out through a die or rectilinear lip (not shown in the figures), producing a film 11 that casts on a rotating drum 12; the latter is cooled inside so that its outer surface is kept at an appropriate temperature: the hot film casting from the die sticks on the drum and cools down because of its lower temperature, thereby stretching until it reaches the required thickness.
  • the film 11 is kept in tension and laminated with a roller 13 arranged along a generatix of the drum 12; in order to distinguish the film 11 just extruded from the one having the desired final thickness and processed afterwards into bags, the latter is called briefly web N.
  • Unit 1 includes also a usual hopper 14 filled in with granules of basic polymer which are fed through a screw 15, to the extrusion head 10.
  • the web N previously extruded by unit 1 but not yet processed into bags is laid down in layers by a folding device downstream the rotating drum 12.
  • This device comprises an oscillating arm 16 moving backwards and forwards in horizontal direction, and a base 17 where the web is laid from above and folded in layers.
  • a web storage device 20 also called “dancer”; this device, known per se, includes a set of upper rollers 21 fixed and a set of lower rollers 22 moving on a slide 23, in vertical direction, driven by a hydraulic or air cylinder 24.
  • Device 2 allows to create a stock of web N in accordance with the production needs, thereby making up for possibile differences between the quantity of web N supplied by the extrusion unit 1 and that processed into bags by the apparatus.
  • the dancer 20 allows to synchronize the quantity of web N produced by unit 1 with the quantity of bags (and of used web) produced by the apparatus.
  • dancer 20 downstream the latter there is a station 3 for application of bag closing tapes or strips.
  • This station includes a frame 30 supporting a folding unit 31 for web N according to the single folded outline shown in figure 3.
  • This station which could also be placed upstream unit 2, is already known per se and will not be considered in further details; likewise, the station 32 forming the hems 33, 34 (see figure 4) for the bags closing tapes Si, S 2 , is already known too.
  • This second unit is also provided with an extrusion head 40 having a die from which the film 41 comes out, casting on the cooled outer surface of a rotating drum 42 to produce an extruded film with transversal and/or longitudinal orientation of the molecular "fibers", that is mono and/or bi-oriented.
  • the film 41 is then folded in layers after the tension roller 43, by a device similar to the one described for unit 1 including an oscillating arm 46 and a base 47 from which the film is taken down; the film runs then in a dancer 48 and it is divided longitudinally in two (or more) tapes Si and S 2 of the same width, by means of a cutter 49.
  • Both tapes are directed to an inserting station 5 wherein they are put into the hems 33, 34 formed in the web N, as occurs in the prior art.
  • tapes Si and S 2 are associated to the web N, in this part of the apparatus they could also be folded transversally or longitudinally if bags different from refuse sacks should be produced, for examples those provided with handles (like the "loop handle” already referred to) or grips.
  • the hems 33 and 34 orientated in the sense of web N feeding speed are longitudinally sealed to the web along respective lines 35 and 36; this sealing operation takes place in a hot air sealer 6, although other solutions like those with hot bars or disks electroheated can be used.
  • a unit 7 composed by a rotating sealing machine 70, as for example those sold by American companies FMC or Hudson Sharp, which can run at a high speed.
  • this kind of sealing machine includes a rotating drum 71 with axis transversal with respect to the web speed, along whose generatrix there are some bars 72 electrically heated; these bars may also be more than the two shown in the figures and each of them has one or two edges 73, 74 protuding in radial sense, that come into contact with the web N and join the overlapped sides thereof to form the bottom or side sealings 37, 38 of the bags.
  • the web is folded to reduce its width to a desired size, by a folding unit 8 where there are some frames or singlefolder inclined triangles 80 and 81 , of the kind commonly known for this operation (for an example of these frames see U.S. Patent n. 4,881 ,933).
  • transverse perforation slits 39 are formed (see figure 6) on the web N, whereby a user can tear the single bags out of the rolls packed by the winder unit 9; the latter is provided for this purpose with a mechanical punching perforation system (not shown in the drawings) and with a set of winding spindles 90 that roll up the web in stretches of prefixed length.
  • this apparatus is suitable to continuously produce plastics bags straight from raw material (i.e. granules of basic polymer), without any interruptions due to the presence of intermediate reels.
  • an extrusion unit 1 where the head 10 has a length which is a multiple (2, 3 or more times) of the width of the web N to be produced: in this case the latter can be cut longitudinally downstream the extrusion unit 1 into tapes of the desired width, which can be processed in parallel (and then converge to the rotative sealing machine) as described above.
  • the present invention is not limited to the production of drawtape bags such as the ones already referred to, but it applies in a more general sense to pouches, sacks, sheets and other similar products, made of plastics films combined with components also made of plastics films.
  • FIGS 7 and 8 Some examples of these products can be seen in figures 7 and 8, showing respectively the upper part of a bag 100 with handles (of the "loop handle” type) and of a bag 110 with punched grips.
  • the handles 101 are made up of a thin plastic strip applied to the layers 102 of the bag (formed by a web of extruded film as the web N of previous example) by means of thermosealing or glueing; both operations can be carried out through well known means (for glueing see the U.S. patent n. 3,660,204) that, obviously, are not present in the apparatus of figure 1 since it is intended for other purposes.
  • the grips 111 are obtained by punching a portion of its walls 112; preferably these grips are reinforced with strips 113 of plastic material applied inside the bag by means of glueing or thermowelding, and extruded in line as the tapes S-i, S 2 of previous example. It is to be considered that such strips can also be used to fasten the handles 101 of the bag 100.
  • the extrusion of tapes Si and S 2 can be done with a blown film extruder, instead of a cast extruder.
  • a blown film extruder 140 of known kind, including a hopper 141 filled in with granules of base polymer.
  • the latter are fed through a screw 142 to the extrusion head 143, from which a semifinished tubular film 144 comes out, flattened as it passes through a set of rollers 145; thereafter the semifinished film is cut along the edges or along its median line by a cutter 146, thereby forming a single fold film from which there are obtained the tapes Si and S 2 moving toward unit 5 for their insertion in the hems of web N, as already described above.
  • the starting extrusion unit 201 of the apparatus that is the one corresponding to unit 1 in the example of figure 1 , includes two blown extruders 202 and 203 similar to that already considered, and intended for production of respective flat webs N' and N".
  • both of these webs are obtained from semifinished tubular film 204, 205 produced by the corresponding extruder, stretched with take up rollers 207, 208 arranged downstream the extruded bubble, at a fixed height.
  • the length of the bubbles 204, 205 and the position of their respective take up rollers 207, 208 is suitable to keep the extruded material at a sufficiently high temperature, that a web is obtained by pressing them with the rollers; in other words the extruded tubular bubbles are transformed into flat webs N' and N", by providing the hot adhesion of their walls pressing the material with the take up rollers.
  • the webs N' and N" have a thickness which is double that of the bubbles 204 and 205, and corresponds to the overlapped walls thereof.
  • the web N" produced in this manner is guided through some single fold frames 210, until it is parallel to the web N' in superimposed condition thereto; after this the webs can be processed in a known manner to produce any item required.
  • a longitudinal joint of both the webs N' and N" along one of their edges can be made, to obtain a single fold product as shown in figure 3; such a joint can be made with hot air like in the case of station 6 of the apparatus of figure 1 , with an electroheated bar or a laser sealing unit as shown in figure 11.
  • the embodiment of the invention just described is an important improvement compared to the web feeding systems with a single bubble extruder.
  • a bag with a half in one colour and the other half in a different colour obtained respectively from webs N' and N" extruded by feeding extruders 202 and 203 with polymers of different colours.
  • this embodiment of the invention allows to overcome the limits existing when using blown extruders for mass production of bags and other similar products.
  • the thickness of the web is generally about 9 ⁇ 10 ⁇ m (micron), with a width of about 70 cm.
  • the layout with two (or more) parallel extruders as in figure 10 allows to extrude tubular bubbles 204, 205 with wall of a thickness of 4,5 ⁇ m; this means that in such a case the webs N' and N" have twice the thickness, i.e. 9 ⁇ m, because of pressing the tubular bubbles with the take up rollers 207, 208.
  • bags can be manufactured from a film having twice the thickness (9 ⁇ m) of the wall (4,5 ⁇ m) of its tubular bubble, with an extrusion speed higher in an inversely proportional manner which corresponds to that required for producing the bubble.
  • Last a further variation to be considered is the one where the element to be associated to the bag is obtained from the same web used for producing the bags.
  • the latter are then moved toward the inserting unit located downstream, for being associated with the web N according to the kind of product to be manufactured.
  • this variation is interesting only for the cases where the elements to be associated to the bag (i.e. tapes, handles, etc) are made of the same material of the plastics film of the bag; this variation can however be applied to the webs extruded both with a cast extruder or a blown one,, like the webs N' and N" of the example in figure 10.
  • the continuous production process of this invention allows to manufacture in a versatile and reliable manner items of plastics film, with features (color, thickness, material, etc.) different according to needs.
  • This new item is an insulating bag 300 that can be used in supermarkets, having multilayer side walls 302, 302' and being provided with handles 301 and with a hermetic fastening 303 commonly-known as "minigrip®”.
  • the insulating configuration of the side walls 302 and 302' is obtained by overlapping three layers 304-306 and 304'-306' for each of them, where the outside layers 304, 306 and 304', 306' are plastics films of the type above considered, whereas the middle layers 305 and 305' are of expanded type, i.e. they are made adding to the base polymer an expanding additive.
  • the hermetic fastening 303 includes a male element 307 made up of a strip of extruded plastics material with some ribs, and a female element 308 made up of a similar strip provided with slots that can be engaged by the above mentioned ribs; optionally, the fastening can also have a slider as a zip fastener.
  • the handles 301 are like those shown in figure 7 and are made also by extrusion of a strip of plastic material.
  • the insulating bag 300 can be mass produced in the same way as described above; for this reason many solutions are possible to meet the different production needs that depend on the sizes, the thickness or other characteristics of the insulating bag to be manufactured.
  • an apparatus as that of figure 16 is provided with a double cast co-extrusion unit 320, where the layers 302 and 302" are separately extruded with a co-extrusion process of the respective layers ' 304-306 and 304'-306'; downstream the unit 320 there are a forming- applying unit 321 of the hermetic seal 303 and a forming-applying unit 322 of the handles 301.
  • Both these units include an extruder and respective devices, for glueing or thermowelding the mentioned elements 307, 308, of the fastening and the handles.
  • the webs of the layers 302, 302' are then longitudinally sealed to form the bottom sealing 309 of the insulating bag; this sealing operation can be effected by any suitable technique (hot air, hot bar etc.) taking into account the thicknesses and the material to be sealed, although it must be pointed out that preferably a laser sealing unit 323 should be used, because several layers have to be joined.
  • any suitable technique hot air, hot bar etc.
  • the semifinished web is cut and sealed in transverse direction with a cutter 324, in order to obtain the side joints 310, 311 of the insulating bags 300 and to divide them one from the other; also in this case the cutter used will be preferably of laser type, even if it is possible to use as an alternative means, the rotating cutting systems already considered or those described in the U.S. patent n. 4,024,010 and the other traditional systems.
  • the insulating bags produced in this way have the advantage of being easy to handle and practical, because the hermetic fastening 303 provides stiffness to their opening so that the contents can be put in and out easily.
  • each handle is made in one piece together with the plastics strip thermosealed along the bags opening, so that neither one nor the other can be extruded; it follows that this part must be produced apart by moulding or similar processes, and then assembled in line with the webs of the bags layers.
  • insulating bags can also be different from the one just considered, because changes thereto are possible within the reaching of this invention.
  • blown extruder or similar is also advantageous because it allows to produce the elements 307, 308 of the hermetic fastening 303, directly together with a film layer of the side wall of the insulating bag; for a possible example of carrying out this extrusion technique, reference can be made to Spanish patent n. 8607823.

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Abstract

L'invention concerne un nouveau procédé de production de sachets, sacs et produits similaires, selon lequel des éléments tels que poignées, rubans adhésifs de fermeture ou autres sont associés à une bande (N) de film plastique. De façon avantageuse, la bande et les éléments devant être associés sont extrudés en ligne de façon que la continuité du cycle de production soit assurée. Dans des modes de réalisation préférés de cette invention, la phase d'extrusion peut être effectuée avec des extrudeuses par moulage ou par soufflage. L'invention concerne également un sac isolant produit à l'aide du procédé susmentionné.
PCT/IT2002/000047 2002-01-30 2002-01-30 Procede et appareil pour la fabrication continue de produits en film plastique WO2003064146A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2002/000047 WO2003064146A1 (fr) 2002-01-30 2002-01-30 Procede et appareil pour la fabrication continue de produits en film plastique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2002/000047 WO2003064146A1 (fr) 2002-01-30 2002-01-30 Procede et appareil pour la fabrication continue de produits en film plastique

Publications (1)

Publication Number Publication Date
WO2003064146A1 true WO2003064146A1 (fr) 2003-08-07

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7207794B2 (en) 2004-01-12 2007-04-24 S.C. Johnson Home Storage, Inc. Pouch production apparatus and method
US11820555B2 (en) * 2017-08-28 2023-11-21 Mettler Packaging LLC Reusable plastic carrier bag

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2038557A1 (de) * 1970-08-03 1972-02-10 Lissmann Alkor Werk Verfahren zur Herstellung eines mehrschichtigen Folienschlauches
GB1444326A (en) * 1974-05-16 1976-07-28 Minigrip London Ltd Apparatus for making sheets with interengageable closure elements
US4196030A (en) * 1976-12-27 1980-04-01 Minigrip, Inc. Method of making extruded construction for bags
US4859259A (en) * 1982-03-24 1989-08-22 First Brands Corporation Process and apparatus for reclosable container stock
US4911872A (en) * 1985-07-11 1990-03-27 Hureau Jean C M Process of making a perforated film
US4930905A (en) * 1988-08-22 1990-06-05 Mobil Oil Corporation Thermoplastic bag with integral draw strip and method of manufacture
EP0758613A1 (fr) * 1995-08-11 1997-02-19 Helmut Dr. Frank Sac refroidissant

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2038557A1 (de) * 1970-08-03 1972-02-10 Lissmann Alkor Werk Verfahren zur Herstellung eines mehrschichtigen Folienschlauches
GB1444326A (en) * 1974-05-16 1976-07-28 Minigrip London Ltd Apparatus for making sheets with interengageable closure elements
US4196030A (en) * 1976-12-27 1980-04-01 Minigrip, Inc. Method of making extruded construction for bags
US4859259A (en) * 1982-03-24 1989-08-22 First Brands Corporation Process and apparatus for reclosable container stock
US4911872A (en) * 1985-07-11 1990-03-27 Hureau Jean C M Process of making a perforated film
US4930905A (en) * 1988-08-22 1990-06-05 Mobil Oil Corporation Thermoplastic bag with integral draw strip and method of manufacture
EP0758613A1 (fr) * 1995-08-11 1997-02-19 Helmut Dr. Frank Sac refroidissant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7207794B2 (en) 2004-01-12 2007-04-24 S.C. Johnson Home Storage, Inc. Pouch production apparatus and method
US11820555B2 (en) * 2017-08-28 2023-11-21 Mettler Packaging LLC Reusable plastic carrier bag

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