EP0176851A2 - Sac - Google Patents

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Publication number
EP0176851A2
EP0176851A2 EP85111678A EP85111678A EP0176851A2 EP 0176851 A2 EP0176851 A2 EP 0176851A2 EP 85111678 A EP85111678 A EP 85111678A EP 85111678 A EP85111678 A EP 85111678A EP 0176851 A2 EP0176851 A2 EP 0176851A2
Authority
EP
European Patent Office
Prior art keywords
sack
closure flap
bag
adhesive
cover sheet
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP85111678A
Other languages
German (de)
English (en)
Other versions
EP0176851A3 (fr
Inventor
Hans Lissner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Priority claimed from DE19843436090 external-priority patent/DE3436090A1/de
Priority claimed from DE19853509181 external-priority patent/DE3509181A1/de
Application filed by Individual filed Critical Individual
Publication of EP0176851A2 publication Critical patent/EP0176851A2/fr
Publication of EP0176851A3 publication Critical patent/EP0176851A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/18—End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps

Definitions

  • the invention relates to a sack which has a closed bottom and a head end which is closed on both sides of a filling opening and, in the region of the filling opening, a closure flap which extends beyond the head end and can be folded over a folding line coinciding with the head end onto the front side of the sack, the Closing flap on its inner surface and / or the associated counter surface on the front of the sack have an adhesive application. It can be a paper or plastic sack.
  • a multilayer paper bag is known (US Pat. No. 4,142,667), in which the paper layers in the head region are cut back in stages.
  • the back wall of the sack is provided with incisions that extend to a fold line.
  • the outer sections are folded over and glued to the front of the sack during manufacture.
  • the flap is turned over and glued to its associated counter surface.
  • the closure of the filled sack that can be achieved in this way is not always dustproof.
  • folds or joints can remain, through which dusty material can escape from the filled sack.
  • There is also the risk that especially weak paper layers in the area of the fold line when manipulating the sack e.g. when plugged onto a filler neck, so stressed that they tear. Even then, a dustproof seal cannot be guaranteed.
  • the object of the invention is a secure and dustproof closure of the bag.
  • a sack of the type described at the outset which is characterized in that, in the case of multilayer sacks, the outer layer of the closure flap has projecting edge strips over the inner layer (s), or that a cover sheet is fastened to the back of the sack is, which is part of the closure flap and has edge strips projecting over the inner layer (s) of the closure flap both in the longitudinal direction of the bag and in the transverse direction of the bag, and that the edge strips extending in the longitudinal direction of the bag each have beads of adhesive on their inner surface which extend over extend the fold line and which are combined with at least one further bead of adhesive on the edge strip extending in the transverse direction of the bag or on the closure flap to form a continuous bead of adhesive.
  • a reliable sealing of the closed sack is achieved because the critical area of the fold line outside the filling opening and outside the inner layers of the closure flap is sealed with sections of adhesive beads which extend beyond the fold line. It is essential that the relevant sections of the adhesive beads cross the fold line continuously, so that when the flap is folded over in the area of the fold line, a sealing bead or plug of adhesive is produced.
  • the closure flap and its counter surface are glued together like a frame, this frame running outside the filling opening.
  • the layers of the closure flap should be glued to one another and possibly to the cover sheet at least in the area of their cut edges.
  • the sections of the adhesive beads which are extended over the fold line can be arranged on the front of the sack.
  • a preferred embodiment of the invention is, however, characterized in that the sections of the adhesive beads extending over the fold line are arranged between the outer and the adjacent inner layer of the sack or between the cover sheet and the back of the sack. Then the adhesive beads follow each paper deformation in the fold line and the bead or plug mentioned arises between adjacent paper layers. Tolerances of the cuts defining the closure flap, which should extend to the fold line, can then no longer have a negative effect on the sealing effect of the closed closure flap.
  • an additional cover sheet also makes it possible to store the sacks produced in a simple manner, which previously had been rolled up into a wrap with the aid of plastic tapes. If the cover sheet is designed as a strip that extends on both sides beyond the width of the sack and corresponds there streaking neighboring sacks and in the bottom area of the sack another stripe connecting neighboring sacks is attached, the sacks connected to these catfish can be layered by alternate folding (fan fold) into a stack. Two or more sacks can also form a layer in the stack.
  • the strip attached to the head end can have incisions on both sides of the closure flap which extend to the fold line, the free sections of the strip located outside the incisions folded over along the fold line and attached to the front of the sack.
  • the head end of the sack can be closed on both sides of the filling opening with sections of the head end of the sack that are folded over one or more times and the folded sections of the strip can extend beyond the folded sack sections to the front of the sack.
  • the layers of the sack can be stepped or congruently cut at the head end.
  • cover sheet extends in the longitudinal direction of the sack to an adjacent sack and is attached to it, e.g. in the floor area.
  • the sacks then hang one behind the other in the longitudinal direction and can be folded down to form a stack.
  • the base area of a stack formed in the manner described can also be adapted to the dimensions of a pallet on which the stack is placed.
  • Such a stack is more stable than the previously used storage in the form of a winding. If it becomes necessary during the filling operation to fill the goods to be filled into sacks that have a different imprint and the previous stack of sacks has not yet been used up, the remaining stack can be used without special Si Safety precautions are replaced by another stack or stored in the warehouse.
  • the paper bag 1 shown in Figure 1 consists of two layers of paper. It is closed in the bottom region 2 with a bottom fold 3 and has a folding flap closure in the head region 4. For this purpose, at least the paper layers of the rear wall are cut off in a staggered manner in the head region 4 and provided with incisions which extend up to a fold line 5.
  • the two outer sections 6, 7 projecting beyond the folding line 5 are folded over onto the front of the bag 1 and glued to it.
  • the middle section forms a double-layer closure flap 8, the inner layer of which, according to the staggered cut and the incisions laterally offset from one another, is smaller than the outer layer.
  • a cover sheet 9, which protrudes beyond the edges of the closure flap 8, is glued to the back of the sack 1 and the closure flap 8. There are two on cover page 9 Edge strips 10, 11 projecting over the longitudinal edges of the closure flap 8 and an edge strip 12 projecting over the transverse edge of the closure flap 8 are defined.
  • Adhesive beads 13, 14 are arranged on the edge strips 10, 11, which are extended to beyond the fold line 5 of the sack 1 and which are combined with an adhesive bead 15 arranged on the edge strip 12 to form a continuous adhesive bead.
  • an adhesive bead 16 is arranged on the front of the sack 1, which after the flap 8 and cover sheet 9 have folded over around the fold line 5 coincides with the adhesive bead 15 on the edge strip 12 and connects the adhesive beads 13, 14.
  • the beads of adhesive 13-16 like the adhesive dots 17, 18 arranged on the closure flap 8, consist of an activatable hot-melt adhesive.
  • the cover sheet 9 is provided with a U-shaped bead of adhesive 13, 14, 15 before it is attached to the bag 1.
  • the adhesive beads 13, 14 are so long that they extend beyond the fold line 5 between the back of the bag 1 and the cover sheet 9.
  • areas of the closure flap 8 and / or the cover sheet 9 and / or their associated counter surfaces not provided with hot melt adhesive are provided with cold glue before the closure flap 8 with the cover sheet 9 is folded over the fold line 5 onto the assigned counter surface.
  • the hot melt adhesive is activated, which means that the surfaces lying on top of each other are quickly connected.
  • the continuous adhesive bead 13-16 forms a frame-like adhesive outside of the filling opening 19 and outside of the closure flap 8 which extends up to extends into the fold, because those areas of the adhesive beads 13, 14 that cover the fold line 5 form beads or plugs there that reliably seal the remaining gaps or joints.
  • the initial connection with the hot melt adhesive withstands all loads that occur during further transport and when the filled sack is stored. After the cold glue has dried, the connection is further improved.
  • the cover sheet 9 is part of a continuous strip 20 which extends over a plurality of sacks 1 arranged next to one another and in the head region of which is fastened both on the rear side and on the front side.
  • the strip 20 is cut so that the sections of the strip 20 located outside the cover sheet 9 can be folded over onto the front sides of the bags 1 and glued to them.
  • the folded-over sections of the strip 20 cover the sections 6 and 7, which are located on both sides of the filling opening and which are folded over along the fold line 5 to the front of the bag 1.
  • the bottom regions 2 of the sacks arranged next to one another are connected by means of a continuous strip 21 which is glued to both the front and the back of the individual sacks.
  • the coherent row of bags 1 can now be folded in the region of the sections 22 located between the individual bags 1 and layered to form a stack 23.
  • two bags 1 each form a layer of the stack next to one another.
  • the width of the stack 23 corresponds essentially to the width of a standard pallet.
  • the stack 23 is stable and can be transported and stored without special security measures.
  • the coherent sacks 1 are removed from the stack 23 and a sack is separated by separating the sections 22.
  • the paper layers of the sacks are not cut in stages, so the layers of the closure flap 8 or their outer cut edges are congruent.
  • the paper layers are glued to one another at least in the region of the cut edges, which separates the closure flap 8 from the sections 6, 7, which also improves the resistance, in particular in the region of the fold line 5.
  • the bags 1 are arranged one behind the other in the longitudinal direction and connected via the cover sheet 9.
  • the cover sheet 9 protrudes somewhat further in the longitudinal direction of the sack 1 via the closure flap 8 and is connected to the bottom region 2 of the next sack 1.
  • Sections 22 are again formed, which enable folding to form the stack 23 shown in FIG.
  • a stack 23 can also be formed, in which the bags are not congruent, but are stacked on top of one another in such a way that the reinforced bottom regions 2 and the reinforced head regions 4 of successive sacks are offset from one another in the longitudinal direction of the sack.
  • the cover sheet 9 and the strips 20, 21 are expediently made of paper. However, other materials are possible.
  • the paper sack 1 shown in FIG. 6 has sack walls each made up of three layers of paper.
  • the layers are cut at the head end of the paper bag 1 so that the respective outer layer has an edge strip projecting beyond the inner layer, which extends over the entire width of the paper bag.
  • the edge strips 42, 43, 44 are each provided with two spaced-apart cuts in the course of the manufacture of the paper bag 1 which extend in the longitudinal direction of the bag, the cuts the ever because inner layers are arranged offset to the middle of the bag and have a smaller mutual distance.
  • outer sections 6, 7 of the edge strips 42, 43, 44 are defined, which are folded over along the common folding line 5 and glued to their associated counter surface on the top of the bag.
  • an edge strip 28 of the inner layer of the upper sack wall is folded over along the fold line 5 and glued to the outer sack wall. This reinforces the edge of a filling opening 19 which remains between the folded-over outer sections 6, 7 and whose length is defined by the length of the edge strip 44 of the inner layer.
  • the edge strips 32, 33 are provided with continuous beads of adhesive 30, 31 before the outer sections 6, 7 are turned over and glued to their counter surfaces. All adhesive beads are shown with dash-dotted lines. The laying of the adhesive beads 30, 31 does not require any special effort, since suitable devices are either already present on the corresponding bag making machines or are easy to attach.
  • edge strips 42, 43, 44 which are not turned over during the manufacture of the sack define the closure flap 8 which extends in the area of the filling opening 19 beyond the head end of the sack or over the fold line 5. Because of the cut described, the edge strip 42 of the outermost position of the sack wall becomes a transverse strip 36 forming the edge of the closure flap 8, to which lateral longitudinal strips 37, 38 adjoin, which lie outside the filling opening 19 and extend to the fold line 5. Furthermore, in the three-layer paper bag 1 shown, the edge strips 43 and 44 of the middle and inner layer of the bag wall become transverse strips 39, 40 the closure flap 8, which end laterally on the longitudinal strips 37, 38.
  • the closure flap 8 is folded around the fold line 5 after filling the bag and glued to its associated counter surface. From the drawing it can be seen that the counter surface is partly formed by the uppermost layer of the upper sack wall, partly by the folded edge strip 43 of the middle layer and partly by the folded edge strip 38.
  • adhesive beads 33, 34 are applied to the longitudinal strips 37, 38 before the bag is closed, which on the one hand touch or cross the already existing adhesive bead 30 and on the other hand also via the fold line 5 to Area of the counter surface.
  • the beads of adhesive 33, 34 can also be applied to the outer paper layer during the manufacture of the paper bag 1, so that they extend between the outer paper layer and the adjacent inner paper layer beyond the fold line 5.
  • the flap 8 After the flap 8 has been turned over, it is glued in a frame-like manner to its associated counter surface via the adhesive beads 30, 33, 34. It is important that the beads of adhesive 33, 34 also extend beyond the fold line 5, because this seals gaps or joints in the area of the fold line, so that no dust can escape from the sack.
  • the adhesive bead 31 on the central transverse strip 39 serves to additionally fasten the closure flap 8 on its counter surface.
  • additional adhesive beads 35 are laid on the counter surface, which extend in the longitudinal direction of the bag and which, in the embodiment shown, extend up to the fold line 5. These additional adhesive beads 35 form a grid-like adhesive bond with the transverse adhesive beads 30, 31.
  • the adhesive beads 30, 31, 33, 34, 35 preferably consist of a hot melt adhesive, which is so early when filling dusty goods is applied in time that the adhesive can harden before the bag with its filling opening 19 is pushed onto a filler neck of a filling device, which is not shown. When filling non-dusting goods, the adhesive beads 30, 31, 33, 34, 35 can also be applied after filling.
  • an adhesive bead and / or a ventilation thread can be laid along the fold line.
  • all adhesive beads can also be covered with a film, not shown, which is removed before closing.
  • the sections 6, 7 can be folded over on both sides of the filling opening 19 in the manner of a multiple fold, so that their open ends are covered by the envelope.
  • the layers of the sack in the head area can also be cut off congruently

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
EP85111678A 1984-10-02 1985-09-16 Sac Withdrawn EP0176851A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19843436090 DE3436090A1 (de) 1984-10-02 1984-10-02 Verfahren zum fuellen und verschliessen von mehrlagigen papiersaecken fuer schuettgut
DE3436090 1984-10-02
DE3509181 1985-03-14
DE19853509181 DE3509181A1 (de) 1985-03-14 1985-03-14 Mehrlagiger papiersack

Publications (2)

Publication Number Publication Date
EP0176851A2 true EP0176851A2 (fr) 1986-04-09
EP0176851A3 EP0176851A3 (fr) 1987-09-30

Family

ID=25825307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85111678A Withdrawn EP0176851A3 (fr) 1984-10-02 1985-09-16 Sac

Country Status (1)

Country Link
EP (1) EP0176851A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3509181A1 (de) * 1985-03-14 1986-09-25 Hans 4000 Düsseldorf Lissner Mehrlagiger papiersack

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2162285A (en) * 1936-10-19 1939-06-13 Chase Bag Company Paper bag
US2757855A (en) * 1950-10-12 1956-08-07 Bemis Bro Bag Co Bag closure
FR2009866A1 (fr) * 1968-05-08 1970-02-13 Dow Chemical Co
FR2150897A1 (fr) * 1971-08-31 1973-04-13 Colgate Palmolive Co
WO1979000064A1 (fr) * 1977-07-25 1979-02-22 W Runo Sac a scellement longitudinal depourvu de valve saillante
CH618934A5 (en) * 1976-08-27 1980-08-29 Ver Papierwarenfab Ag Bag and method for the production thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2162285A (en) * 1936-10-19 1939-06-13 Chase Bag Company Paper bag
US2757855A (en) * 1950-10-12 1956-08-07 Bemis Bro Bag Co Bag closure
FR2009866A1 (fr) * 1968-05-08 1970-02-13 Dow Chemical Co
FR2150897A1 (fr) * 1971-08-31 1973-04-13 Colgate Palmolive Co
CH618934A5 (en) * 1976-08-27 1980-08-29 Ver Papierwarenfab Ag Bag and method for the production thereof
WO1979000064A1 (fr) * 1977-07-25 1979-02-22 W Runo Sac a scellement longitudinal depourvu de valve saillante

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3509181A1 (de) * 1985-03-14 1986-09-25 Hans 4000 Düsseldorf Lissner Mehrlagiger papiersack

Also Published As

Publication number Publication date
EP0176851A3 (fr) 1987-09-30

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