US20170334608A1 - Method for producing a side-gusseted bag and flat, unfilled side-gusseted bag - Google Patents

Method for producing a side-gusseted bag and flat, unfilled side-gusseted bag Download PDF

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Publication number
US20170334608A1
US20170334608A1 US15/594,995 US201715594995A US2017334608A1 US 20170334608 A1 US20170334608 A1 US 20170334608A1 US 201715594995 A US201715594995 A US 201715594995A US 2017334608 A1 US2017334608 A1 US 2017334608A1
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US
United States
Prior art keywords
bag
gusseted
gussets
front walls
film
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.)
Abandoned
Application number
US15/594,995
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English (en)
Inventor
Alfons Kruse
Detlef STOEPPELMANN
Jens Koesters
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.)
Nitto Advanced Film Gronau GmbH
Original Assignee
Mondi Gronau GmbH
Mondi Consumer Packaging Technologies GmbH
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Filing date
Publication date
Application filed by Mondi Gronau GmbH, Mondi Consumer Packaging Technologies GmbH filed Critical Mondi Gronau GmbH
Assigned to MONDI CONSUMER PACKAGING TECHNOLOGIES GMBH reassignment MONDI CONSUMER PACKAGING TECHNOLOGIES GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOESTERS, JENS, KRUSE, ALFONS, STOEPPELMANN, DETLEF
Publication of US20170334608A1 publication Critical patent/US20170334608A1/en
Assigned to MONDI GRONAU GMBH reassignment MONDI GRONAU GMBH MERGER (SEE DOCUMENT FOR DETAILS). Assignors: MONDI CONSUMER PACKAGING TECHNOLOGIES GMBH
Abandoned 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
    • 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
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/16—Cutting webs
    • B31B70/18—Cutting webs longitudinally
    • 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
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/262—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement
    • B31B70/266—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement involving gusset-forming
    • 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
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • B65D33/2516—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor comprising tamper-indicating means, e.g. located within the fastener
    • B65D33/2533—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor comprising tamper-indicating means, e.g. located within the fastener the slide fastener being located between the product compartment and the tamper indicating means
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/008—Standing pouches, i.e. "Standbeutel"
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5816—Opening or contents-removing devices added or incorporated during package manufacture for tearing a corner or other small portion next to the edge, e.g. a U-shaped portion
    • 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
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0012—Flexible containers made from webs by folding webs longitudinally having their openings facing in the direction of movement
    • 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
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/002—Flexible containers made from webs by joining superimposed webs, e.g. with separate bottom webs
    • 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
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
    • 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
    • B65D2575/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
    • B65D2575/52—Details
    • B65D2575/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D2575/586—Opening or contents-removing devices added or incorporated during package manufacture with means for reclosing
    • 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
    • B65D33/20—End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps using pressure-sensitive adhesive
    • 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
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5861—Spouts
    • B65D75/5866—Integral spouts

Definitions

  • the invention relates to a method for producing a side-gusseted bag.
  • the method includes guiding a material web of a bag film in a production direction, and folding the bag film to yield a side-gusseted tube comprising a first front wall, a second front wall, and, disposed therebetween, side gussets which connect the front walls.
  • Individual side-gusseted bags are separated from the side-gusseted tube.
  • the invention also relates to a flat, unfilled side-gusseted bag formed using the method.
  • a wing i.e., one half of the corresponding side gusset, is connected to the first front wall and the other half of the side gusset is connected to the second front wall.
  • the length of the reclosure strip can be different on the two front walls.
  • the reclosure strip on the front walls can also extend beyond the corresponding side gussets, and therefore the two front walls are directly connected to each other adjacent to the side gusset, whereby a larger removal opening is provided. It is always provided, however, that the reclosure extends only across a portion of the entire width of the front walls.
  • a connecting line a heat-sealed seam can be also provided alongside the reclosure strip either in the bag longitudinal direction or the bag transverse direction, to delimit the opening.
  • the front walls and the side gussets are formed from a single film web by folding. Individual side-gusseted bags or corresponding blanks are then separated from one side-gusseted tube comprising the front walls and the side gussets, each of which comprises a reclosure device.
  • EP 1 541 332 A1 describes a method for producing film packaging bags, in the case of which a bag strand is formed in such a way that successive film packaging bags are arranged next to each other at their bag longitudinal edges.
  • the production direction therefore corresponds to a bag transverse direction of the individual bags, and such a method is therefore also referred to as a transverse method or a Totani method.
  • a bag strand is initially formed from successive, connected bag blanks.
  • a first film web is guided in the production direction.
  • a film strip is then supplied, wherein the edges of the film strip are folded over onto a center section. The edges are usually equally wide, wherein a gap remains between the edges after folding.
  • pieces of the film strips are placed onto the first film web at equidistant intervals, transversely to the production direction (i.e., along the bag longitudinal direction), before a second film web is supplied in the production direction, which then covers the first film web and the pieces of the film strip.
  • one lower edge of the side-gusseted bag can be closed by a transverse sealing seam, wherein an even upright stance of the side-gusseted bag is not possible. Instead, such a side-gusseted bag tends to tip over during filling, transport, and storage, when said bag is supposed to be stood upright on its lower section, as the base.
  • the present invention overcomes the shortcomings of known arts, such as those mentioned above.
  • the present invention provides a method for producing a side-gusseted bag that displays a good standing ability and a high-quality appearance.
  • the method also produces a flat, unfilled side-gusseted bag comprising a reclosure device.
  • the method for producing a side-gusseted bag includes that an incision extending in a transverse direction is produced in the bag film for each side-gusseted bag in such a way that, in the case of the side-gusseted tube, the incision extends over both side gussets and the first front wall which is situated between the side gussets.
  • the first front wall which is parted by means of the incision, is lifted on one side of the incision and is at least partially folded over, whereby sections of the underlying second front wall and the side gussets are exposed.
  • a separate film section is connected via first connecting seams to the folded-over section of the first front wall and the second front wall and via second connecting seams to the exposed side gussets, and the folded-over section is folded back in such a way that the second connecting seams extend in parallel to the first connecting seams in the transverse direction.
  • the side-gusseted bag is usually formed from plastic film, for example, multilayer laminated films are considered for the production, wherein the films in this case comprise a heat-sealable inner layer on an inner side of the side-gusseted bag and an outer layer forming the outer surface of the side-gusseted bag, wherein, in the case of a laminated film, an imprint can also be provided on the inside, which is produced before the laminating is carried out.
  • one of the two side gussets can be provided with the reclosure device, by which the side gussets can be fixed and closed in a folded-in state between the front walls, the side gussets can be folded outward by opening the reclosure device, to form a spout.
  • a top sealing seam extending in the transverse direction is usually provided above the reclosure device, which seam must be initially torn off, cut off, or peeled open, in areas, to facilitate a first-time opening which is accompanied by a removal of the top section.
  • the side-gusseted bag is usually provided with printing on the bag outer side on all bag surfaces, i.e., on its front walls, its side gussets, and on the separate film section as the base, or is provided with an imprint on the inside, which is visible on the outside of the bag.
  • the inner surfaces of the side-gusseted bag are formed of a sealable layer which is usually designed to be a single color, in particular white.
  • regions of the film section can extend beyond the underlying surfaces of the front walls and side gussets, or can fall short of the surfaces, due to a deviation in terms of size and position. In the absence of further measures, this would result in the case with respect to the finished side-gusseted bag in which sections of the inner surfaces of the bag are visible as so-called “fringe”, whereby the visual appearance of the side-gusseted bag is substantially adversely affected.
  • the film section and the lower edges of the front walls and side gussets are trimmed, wherein this trimming preferably takes place simultaneously with the separation of individual side-gusseted bags from the side-gusseted tube.
  • the method according to the invention is carried out in such a way that, when the previously folded-over section is folded back, the second connecting seams, by which the separate film section is connected to the side gussets, extend in parallel to the first connecting seams in the transverse direction, for which the folding-back must be controlled in a suitable way.
  • the separate film section would extend along the first connecting seams in the transverse direction and along the second connecting seams in the longitudinal direction of the side-gusseted tube, for which a trimming would therefore also be necessary to avoid “fringe” both in the transverse direction and in the longitudinal direction of the side-gusseted tube.
  • the folding-back is carried out and controlled in such a way, however, that the side gussets are re-inserted between the front walls along their entire length, whereby the separate film section is then placed in multiple layers, one over the other, in the region of the side gussets, and therefore the lower end of the side gussets then overlaps with the lower ends of the front walls again, and therefore the first connecting seams and the second connecting seams also can be jointly trimmed here as well by a single cut in the transverse direction. Also, a double cut along two cutting lines extending in the transverse direction is carried out to trim and separate the individual side-gusseted bags.
  • a first cutting line of the double cut forms the upper edge of the subsequent bag.
  • the distance between the two cutting lines of the double cut can be, for example, between 1 mm and 20 mm, in particular, between 2 mm and 10 mm.
  • the incisions can be advantageously formed in the material web when it is still flat, wherein tearing must be prevented during folding, however, and the material web must be guided with appropriate caution.
  • only one line of weakness or a perforation is provided on the material web, which is subsequently further separated.
  • the method provides that reclosure strips extending transversely to the production direction are arranged on the material web with uniform spacing and equidistantly from the incisions; after the formation of the side-gusseted tube, the reclosure strips extend on one of the side gussets and over a portion of each of the two front walls.
  • Such side-gusseted bag which is described in the following, is formed with a reclosure on the first side gusset.
  • the reclosure strip extends on the front walls advantageously at least across a width which corresponds to half the width of the assigned side gusset. In such an arrangement, only one connection of the two wings of the side gusset to one of the front walls, respectively, is established. If the reclosure extends beyond the region of the side gussets, sections of the two front walls also can be directly connected to each other. At the least, the reclosure strip extends over only a portion of the front walls.
  • handles which are advantageously located on the side gusset that is positioned opposite the reclosure strip, also can be installed in the method.
  • Different suitable handle configurations are known from EP 2 148 820 B1.
  • a heat-sealed seam is provided.
  • the heat-sealed seam is formed in the region of one of the lateral edges.
  • all lateral edges are provided with a heat-sealed seam to improve the stability of the side-gusseted bag, which is formed.
  • overhangs can also be provided there, which are trimmed, i.e., cut off.
  • the first front wall is preferably folded over on a fold line, which is spaced apart from the incision, in such a way that the distance of the fold line to the incision corresponds to approximately one-half the width of the side gusset.
  • the front wall is then folded over as far as possible, whereby the exposed side gusset extends outwardly at an oblique angle of 45°, proceeding from a central bending line.
  • the separate film section for forming a flat base for each side-gusseted bag is advantageously fastened to the front walls and to the side gussets by heat-sealed seams.
  • the sealing at the side gussets can readily take place on the flat side-gusseted tube.
  • the corresponding generation of a transverse sealing seam preferably takes place in the lifted state.
  • the invention also provides a flat, unfilled side-gusseted bag comprising two front walls positioned opposite each other, and a first and a second side gusset which are positioned opposite each other, extend along a bag longitudinal direction, and each connect the two front walls to each other.
  • at least one reclosure device comprising a reclosure strip is provided, the reclosure device being situated in the region of the first side gusset that extends along a bag transverse direction across only a portion of the width of the front walls and allows the first side gusset to be folded outward to form a reclosable spout.
  • the flat, unfilled side-gusseted bag can be produced, in particular, using the above-described production method and is characterized in that a separate film section is provided for forming a flat base.
  • the film section is connected via first heat-sealed seams to lower ends of the front walls and via second heat-sealed seams to lower ends of the side gussets, wherein the film section is situated between the front walls in such a way that the first heat-sealed seams and the second heat-sealed seams are arranged in parallel to each other along the bag transverse direction.
  • the side-gusseted bag according to the invention is characterized by particularly advantageous handling.
  • the side gusset With the aid of the reclosure device on the first side gusset, the side gusset can be fixed in a folded-in state after a first-time opening.
  • the two wings of the first side gusset are each then fastened on one of the two front walls.
  • the side gussets then can be folded outward by releasing the reclosure, to form a spout, thereby making it possible to measure out particularly easily and precisely.
  • the side-gusseted bag can be emptied by a user in a controlled manner by a tilted position, wherein, specifically, a precise removal of partial quantities is possible and the remaining product is protected by the reclosure device.
  • the side-gusseted bag can have a fill volume between 1 l and 50 l, in particular, between 20 l and 30 l.
  • the side-gusseted bag is suitable, in particular, for accommodating pourable product such as pelleted animal food, detergent, cat litter, de-icing salt, and powdered or granular building materials.
  • a top sealing seam which sealingly closes the side-gusseted bag, is, provided above the reclosure device for a first-time opening.
  • a top sealing seam which sealingly closes the side-gusseted bag, is, provided above the reclosure device for a first-time opening.
  • at least one part of the top of the bag formed by a top sealing seam is torn off, to expose the underlying reclosure device and make it possible to fold out the spout.
  • the reclosure device comprises at least one reclosure strip, which preferably extends precisely in the bag transverse direction.
  • the reclosure device may comprise several separate reclosure strips that can be interlocked with, each other.
  • the reclosure device comprises a single, continuous and self-interlockable reclosure strip.
  • Such a reclosure strip can be placed onto a flat material web particularly easily during production, wherein this reclosure strip is then situated in the desired position on the side gusset merely by folding.
  • the reclosure strip can comprise either continuous closure formations or a large number of individual closure elements that can be interlocked with each other.
  • Possible continuous closure formations are, for example, grooves, projections and strips bent into the shape of hooks, which can be interlocked′ with each other or are self-interlockable.
  • Corresponding structures can be extruded as a strand, for example, wherein the closure formations are usually arranged on a heat-sealable support section or are integrally extruded with the heat-sealable support section.
  • Individual closure elements that can be interlocked with each other can be provided, for example, in the form of gripping hooks, mushrooms, or the like. Individual closure elements that can be interlocked with each other yield the advantage that a secure interlocking is possible even in the case of a vertical offset.
  • the individual mushrooms or gripping hooks are generally movable in such a way that, when pressed upon from the outside, they can enter an assigned space and interlock with similar closure elements therein.
  • the advantage also results that, although soiling locally prevents a connection, the entire reclosure strip cannot be easily pulled off proceeding from the soiling.
  • the front walls and the side gussets are formed from a bag film, in particular a uniform bag film.
  • the front walls and the side gussets are folded from a uniform material web, as described above.
  • the bag film comprises at least one heat-sealable inner layer and one outer layer, wherein the assignment to the inner layer and the outer layer is relative to the arrangement of the bag film on the side-gusseted bag.
  • the inner layer therefore forms the inner surface of the side-gusseted bag, while the outer layer forms the outer surface.
  • the inner layer is advantageously well heat-sealed in order close the bag around the circumference, enable the formation of longitudinal and transverse sealing seams, and enable further devices such as the reclosure device to be fastened by heat sealing.
  • Possible heat-sealable materials for the inner layer are not only polyolefins such as polyethylene (PE) and polypropylene (PP) and copolymers of polyolefin, but also different biologically degradable plastics such as polylactic acid (PLA), polybutylene adipate terephthalate (PEAT), and polybutylene succinate (PBS).
  • the outer layer cannot be heat-sealed as well as the inner layer, for which the outer layer can have a higher melting or softening temperature. As a result of a heat-sealing of the bag film, although the inner layer is melted, possibly through the outer layer, the outer layer is not excessively deformed, nor does it lose its structure.
  • the outer layer can be formed from polyester, in particular. A reduction of the melting tendency during heat sealing is achieved by an orientation of the outer layer. Possible materials for the outer layer are therefore also oriented polyethylene terephthalate (OPET), oriented polyamide (OPA), oriented polypropylene (OPP), and oriented polylactic acid (OPLA).
  • the outer layer can be formed from a cellulose film.
  • a laminated film is utilized as the bag film, wherein a first film is connected to the inner layer by adhesive and at least one second film is connected to the outer layer by adhesive.
  • a two-component adhesive based on polyurethane (2K-PUR), for example, is suitable.
  • further intermediate layers can be provided, for example, to increase the barrier effect.
  • a film layer made of ethylene vinyl alcohol copolymer (EVOH), a thin metal foil, or a metallized film layer, for example, can be provided as barriers.
  • an imprint is preferably also provided on the inside, which is applied to one of the connecting surfaces of the films to be connected to each other, before the laminating is carried out.
  • the side-gusseted bag is advantageously produced using a longitudinal method, wherein a material web of the bag film is initially reshaped into a side-gusseted tube, from which individual side-gusseted bags are then separated.
  • a material web of the bag film is initially reshaped into a side-gusseted tube, from which individual side-gusseted bags are then separated.
  • at least a portion of lateral edges formed between the side gussets and front walls is designed as folded edges.
  • a longitudinal sealing is advantageously carried out to allow for closure around the circumference during the production of the side-gusseted tube.
  • the longitudinal sealing can coincide with one of the lateral edges, and therefore this lateral edge is not designed as a folded edge.
  • the edges of the material web also can be connected to one of the front surfaces by a longitudinal seam.
  • the generation of longitudinal sealing seams on the lateral edges is advantageous to increase the dimensional stability and dimensional accuracy of the side-gusseted bag.
  • an outer edge can also be cut off to improve the appearance.
  • An upper bag edge above the reclosure device is usually closed by a transverse sealing seam.
  • the side gussets extend from the flat base up to the transverse sealing seam on the upper edge of the bag, i.e., across the entire side-gusseted bag as viewed in the bag longitudinal direction. Further measures for shortening the side gussets are then unnecessary.
  • the side-gusseted bag can be provided with a handle.
  • the handle can be punched at the top of the bag, in a sealed region, as is known from EP 2 032 454 B1.
  • the second side gusset comprises a handle which is then positioned opposite the reclosure device. Suitable embodiments of handles are known from EP 2 148 820 B1. While the reclosure device is advantageously situated close to an upper end of the side-gusseted bag, the handle can be located, with respect to the bag longitudinal direction, approximately in the center or slightly offset in the direction of the flat base of the side-gusseted bag. Accordingly, the weight of the side-gusseted bag is then easily controlled even during pouring.
  • FIG. 1 presents a perspective view of a side-gusseted bag, according to the invention, in a filled state
  • FIG. 2 presents the side-gusseted bag according to FIG. 1 in an unfilled, flat state
  • FIG. 3A presents a method step in an exemplary method for producing a side-gusseted bag of FIGS. 1 and 2 ;
  • FIG. 3C presents another method step for producing the side-gusseted bag of FIGS. 1 and 2 ;
  • FIG. 3E presents another method step for producing the side-gusseted bag of FIGS. 1 and 2 ;
  • FIG. 3F presents another method step for producing the side-gusseted bag of FIGS. 1 and 2 .
  • FIG. 1 shows a filled side-gusseted bag closed in the bag longitudinal direction l by a top sealing seam 3
  • FIG. 2 shows a flat, unfilled side-gusseted bag according to the invention, as a pre-made bag in a flat state for a subsequent filling.
  • the pre-made flat bag is filled at the upper edge, which is initially not yet closed, and is closed by the top sealing seam 3 .
  • the lateral edges between the front walls 1 a , 1 b and the side gussets 2 a , 2 b are reinforced by longitudinal sealing seams 4 .
  • the bag comprises a reclosure device comprising a reclosure strip 6 .
  • the reclosure strip 6 is located in the region of the first side gusset 2 a and extends across the two wings of the first side gusset 2 a , which are inserted between the front walls 1 a , 1 b , and along the front walls 1 a , 1 b .
  • the reclosure strip 6 on the front walls 1 a , 1 b extends beyond the first side gusset 2 a , and therefore the two front walls 1 a , 1 b can also be directly connected to each other there, in a region adjoining the first side gusset 2 a .
  • the two wings of the corresponding side gusset 2 a are connected to one of the two front walls 1 a and 1 b , respectively.
  • a line of weakness 7 is situated above the reclosure strip 6 , by which a corner section 8 above the reclosure strip 6 can be removed.
  • the line of weakness 7 can be formed, for example, by a punching, a perforation, or a laser, wherein the different measures can also be combined with one another.
  • a notch 9 also is provided for initiating the tear.
  • a transverse sealing seam 10 which extends from the end of the reclosure strip 6 to the opposite bag edge, is formed adjacent to the reclosure strip 6 .
  • the first side gusset 2 a can be folded outward by opening the reclosure device formed by the reclosure strip 6 , thereby forming a spout, and can be re-inserted between the two front walls 1 a , 1 b , to permit closure again.
  • the side-gusseted bag comprises a flat base, which is formed from a separate film section 11 .
  • the film section 11 is connected to the lower edges of the front walls 1 a , 1 b , and the side gussets 2 a , 2 b , by heat-sealed seams 12 a , 12 b .
  • the flat base is particularly advantageous for filling, transport, storage, and handling, and makes it possible to reliably stand the side-gusseted bag upright
  • the product can be easily removed by the reclosure device, wherein the removal of partial quantities, in particular, is also precisely possible due to the formation of a spout.
  • the side-gusseted bag can also be equipped with a handle (not shown), which is advantageously located on the second side gusset 2 b positioned opposite the reclosure device.
  • the reclosure strip 6 can comprise continuous closure formations in the form of grooves or projections or also a large number of individual closure elements that can be interlocked with each other, wherein such individual closure elements that can be interlocked with each other can have the shape, for example, of mushrooms or gripping hooks.
  • the side gussets 2 a , 2 b extend along the entire length of the front walls 1 a , 1 b , and also are not bent outward in the region of the separate film section 11 . Instead, the separate film section is folded back onto itself in the region of the side gussets 2 a , 2 b , in such a way that all heat-sealed seams 12 a , 12 b , provided for the connection of the film section to the front walls, on the one hand, and for the connection of the film section 11 to the side gussets 2 a , 2 b , on the other hand, extend one above the other along the bag transverse direction q and can therefore be jointly trimmed in order to remove overhangs resulting from dimensional and positional deviations.
  • FIGS. 3 a to 3 f A preferred method for producing the side-gusseted bag shown in FIGS. 1 and 2 is represented in FIGS. 3 a to 3 f.
  • a material web of a bag film 13 is fed in a production direction p, the orientation of which corresponds to the bag longitudinal direction l.
  • the corresponding method therefore, also is referred to as a longitudinal method.
  • folding the bag film 13 yields a side-gusseted tube 14 , which comprises a first front wall 1 , a second front wall 1 b , and two side gussets 2 a , 2 b , connecting the front walls 1 a , 1 b .
  • the bending lines are already indicated.
  • Outer edges 15 of the bag film 13 are provided as overhang and are removed after the formation of the side-gusseted tube 14 .
  • an incision 16 extending in a transverse direction is produced in the bag film 13 for each side-gusseted bag before folding in such a way that the incision 16 in the subsequently formed side-gusseted bag 14 extends across the two side gussets 2 a , 2 b , and the first front wall 1 a , which is situated between the side gussets 2 a , 2 b .
  • the individual side-gusseted bags are separated from each other in the region of the incisions 16 , wherein the incision 16 is provided for forming a flat base.
  • a side-gusseted tube 14 first and to then produce the incisions 16 .
  • the side-gusseted tube 14 can be pulled, for example, over a type of core, which is then provided as a type of abutment for producing the incisions 16 , for example, by stamping.
  • the incisions 16 also can be formed by a laser or a particularly precise punching after the formation of a side-gusseted tube, wherein a cut completely through the side-gusseted tube should always be avoided.
  • the bag film 13 is formed of at least two layers and comprises a heat-sealable inner layer made of polyolefin, in particular, polyethylene, and an outer layer made of polyester, in particular, polyethylene terephthalate (PET).
  • the film section 11 can be formed from an identical or similar material having a corresponding layered design. According to FIG. 3 a , in the case of the bag film 13 which is supplied in the flat state, the heat-sealable inner layer is initially exposed, and therefore a reclosure strip 6 extending in the transverse direction can also be sealed thereon at that point for each side-gusseted bag.
  • the line of weakness 7 is also already produced in the flat bag film 13 , adjacent to the reclosure strip 6 , by which the upper corner section 8 can be subsequently removed from the finished side-gusseted bag to expose the reclosure strip 6 during a first-time opening.
  • the first front wall 1 a can be lifted, for which grippers or vacuum cups, for example, can be utilized.
  • the side-gusseted tube is moved in such a way that the bottom region lies in front of the top region relative to the individual film bags to be separated from the side-gusseted tube 14 .
  • the production of the film bag also can take place in such a way, however, that the production direction is precisely reversed with respect to the upper edge and the lower edge of the side-gusseted bag to be formed, and therefore, after the formation of the side-gusseted tube 14 from the bag film 13 , the top lies at the front relative to the individual side-gusseted bags to be formed.
  • Such a reversed direction can be advantageous to fold the folded-over section back, within the scope of the invention, in such a way that the second connecting seams extend in parallel to the first connecting seams in the transverse direction q.
  • this separate film section 11 is connected to the folded-open side gussets by heat-sealed seams 12 b , wherein this heat sealing can be carried out on a flat side-gusseted tube 14 .
  • FIG. 3 f it is indicated in FIG. 3 f that the individual, successive, flat, unfilled side-gusseted bags are separated from each other by means of a double cut D, on the one hand, and, simultaneously, an outer edge is removed at the first and second heat-sealed seams 12 a , 12 b to remove any overhangs and “fringes” connected thereto (see also FIG. 2 ).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Bag Frames (AREA)
US15/594,995 2016-05-17 2017-05-15 Method for producing a side-gusseted bag and flat, unfilled side-gusseted bag Abandoned US20170334608A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16170007.5A EP3246266B1 (de) 2016-05-17 2016-05-17 Verfahren zur herstellung eines seitenfaltenbeutels sowie flachliegender, unbefüllter seitenfaltenbeutel
EP16170007.5 2016-05-17

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US15/594,995 Abandoned US20170334608A1 (en) 2016-05-17 2017-05-15 Method for producing a side-gusseted bag and flat, unfilled side-gusseted bag

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US (1) US20170334608A1 (de)
EP (1) EP3246266B1 (de)
ES (1) ES2724424T3 (de)
PL (1) PL3246266T3 (de)

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US11214406B2 (en) 2018-10-24 2022-01-04 Mondi Ag Unfilled open side-gusset bag
US11377284B2 (en) * 2019-11-13 2022-07-05 General Mills, Inc. Resealable bag and method of producing the resealable bag
EP4361061A1 (de) * 2022-10-26 2024-05-01 The Procter & Gamble Company Waschmittelprodukt

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FR3094351B1 (fr) * 2019-03-28 2021-03-19 Coveris Flexibles France Procédé de fabrication d’une pluralité de sacs d’emballage à ouvertures partielles et selon une technique transversale

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US4059478A (en) * 1974-03-25 1977-11-22 Hoffman Louis S Apparatus for bonding layers of resinous material
US5364189A (en) * 1993-07-09 1994-11-15 Kabushiki Kaisha Hosokawa Yoko Zippered bag and method of forming the same
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US11214406B2 (en) 2018-10-24 2022-01-04 Mondi Ag Unfilled open side-gusset bag
US11377284B2 (en) * 2019-11-13 2022-07-05 General Mills, Inc. Resealable bag and method of producing the resealable bag
EP4361061A1 (de) * 2022-10-26 2024-05-01 The Procter & Gamble Company Waschmittelprodukt
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WO2024091752A1 (en) * 2022-10-26 2024-05-02 The Procter & Gamble Company Detergent product

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PL3246266T3 (pl) 2019-08-30
EP3246266B1 (de) 2019-02-20
ES2724424T3 (es) 2019-09-10

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