EP4342812A1 - Sac à soufflets latéraux - Google Patents

Sac à soufflets latéraux Download PDF

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Publication number
EP4342812A1
EP4342812A1 EP22197193.0A EP22197193A EP4342812A1 EP 4342812 A1 EP4342812 A1 EP 4342812A1 EP 22197193 A EP22197193 A EP 22197193A EP 4342812 A1 EP4342812 A1 EP 4342812A1
Authority
EP
European Patent Office
Prior art keywords
film
outer film
front walls
inner film
bag body
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.)
Pending
Application number
EP22197193.0A
Other languages
German (de)
English (en)
Inventor
Jens Kösters
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.)
Mondi AG
Original Assignee
Mondi AG
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 Mondi AG filed Critical Mondi AG
Priority to EP22197193.0A priority Critical patent/EP4342812A1/fr
Priority to PCT/EP2023/074722 priority patent/WO2024061652A1/fr
Publication of EP4342812A1 publication Critical patent/EP4342812A1/fr
Pending 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
    • 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
    • B65D75/5805—Opening or contents-removing devices added or incorporated during package manufacture for tearing a side strip parallel and next to the edge, e.g. by means of a line of weakness
    • 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
    • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
    • 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
    • B65D31/04—Bags or like containers made of paper and having structural provision for thickness of contents with multiple walls
    • 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
    • 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
    • B65D2565/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D2565/38—Packaging materials of special type or form
    • B65D2565/381—Details of packaging materials of special type or form
    • B65D2565/385—Details of packaging materials of special type or form especially suited for or with means facilitating recycling

Definitions

  • the invention relates to a gusseted bag with a bag body having a first front wall, a second front wall and two side gussets, the side gussets being arranged on longitudinal edges of the bag body between the front walls and connected to the front walls by longitudinal sealing seams, the first front wall being composed of an inner film and an outer film , which are partially unconnected to each other, is formed.
  • the gusseted bag is intended in particular as a packaging bag.
  • the gusseted bag is then suitable, for example, for the provision, storage and transport of various foods, pet food, household chemicals and other everyday goods.
  • the gusseted bag can be used for solid, lumpy, granular or powdery as well as liquid or pasty products that are protected by the bag body.
  • the gusseted bag intended as a packaging bag is sealed tightly or largely tightly after filling, so that safe transport and storage are possible.
  • valves can optionally also be provided, for example to enable a controlled escape of gases formed. If the gusseted bag has a resealable closure, further storage is possible even after it has been opened for the first time.
  • a laminating composite with an inner film made of polyethylene (PE) and an outer film based on polyethylene terephthalate (PET) or biaxially oriented polypropylene (BO-PP) are often provided as the material for the bag body, with a printing layer in such a laminating composite being created before the gluing Inner film with the outer film lying on the inside on the contact surface is applied either to the outer film or the inner film and is then visible through the transparent outer film.
  • Such conventional film packaging bags are characterized by a particularly high-quality appearance and good functional properties.
  • pure plastic recycling is not possible, which is why corresponding foil packaging bags as disposable items are often landfilled or burned after use, although thermal recycling is at least still possible.
  • chemical recycling can also be considered, although this is comparatively complex.
  • gusseted packaging bag is known, the bag body of which has an outer layer and an adjoining inner layer. At least the outer layer is oriented, with special advantages in terms of sealability being achieved when the outer layer is laminated with a non-oriented inner layer.
  • the entire gusseted bag can be made of one type or essentially of one type, in particular from polyethylene, in which case recycling of the corresponding polymer material is then possible.
  • a print be arranged as a counterprint on the inside at the transition from the inner film to the outer film.
  • the printing inks then remain in the recycled material and lead to a discoloration.
  • printing inks are often questionable from a physiological point of view, so the use of the recycled material in direct contact with food is not easily possible.
  • corresponding recycled materials are often used for lower-quality plastic products, which is why downcycling is also referred to in this context.
  • the bag body is formed from a bag film, which forms the inner film on one of the front walls, where the outer film is attached in the form of a printed material section with a non-separable connecting seam.
  • the bag film itself is unprinted, and the usually significantly thinner printed material section can preferably be removed manually by a user. This can be done, for example, within the frame-shaped connecting seam with the bag film along a weakening line
  • the unprinted material does not contain any dyes, pigments or the like in the polymer matrix, which is why the bag body is often clear or at least opaquely translucent, depending on the plastic used.
  • the difference is that the filling material is visible at least on partial surfaces of the bag body.
  • a consumer will immediately notice these differences compared to a conventional bag and, in many cases, find them disadvantageous.
  • a granular filling material in the form of cereals, pelleted pet food or the like, fragments, crumbs and other small components may be present, which are hardly noticeable in conventional foil bag packaging, but can affect the appearance of a transparent or translucent bag body.
  • the present invention is based on the object of providing a gusseted bag, particularly in the form of a gusseted packaging bag, which has good functional properties and a high-quality appearance and at the same time can be recycled in an efficient manner.
  • the subject of the invention is a gusseted bag according to claim 1.
  • the second front wall and the gussets are each formed by an inner film and an outer film, which are partially unconnected to one another.
  • a double-layer design with the inner film and the outer film arranged thereon is therefore provided around the circumference of the bag body on all four sides.
  • the front walls and the side folds are connected to one another by the longitudinal sealing seams, whereby the corresponding sections are joined together, with the longitudinal sealing seams additionally giving a cuboid shape and stabilizing the bag body.
  • front walls and the side folds are formed from separate blanks, which are only connected to one another by the longitudinal sealing seams.
  • the longitudinal sealing seams are then also necessary in order to form the bag body and to seal it tightly on the circumference.
  • Corresponding gusseted bags can be produced, for example, by a process which is described in the EP 2 857 323 B1 is described, including the technological background EP 1 541 332 A1 is referred.
  • Corresponding methods are also referred to in practice as transverse methods, with separate material webs being supplied for the formation of the first front walls and the second front walls of several gusseted bags following a production direction, which are, for example, previously cut from a wider web.
  • transverse method it can be provided that the side folds end below an upper edge of the bag body, for which purpose the side folds are bent outwards there and are thus fastened and closed on the longitudinal sealing seams.
  • the bag body has a usually rectangular bottom, which is connected to the front walls and the side folds via bottom sealing seams, wherein the bottom is preferably also formed by an inner film and an outer film, which are partially unconnected to one another.
  • both front walls and both side folds are each formed by an inner film and an outer film, which are partially unconnected to one another.
  • An optional floor is also preferably designed accordingly.
  • the invention is not limited to gusseted bags formed in a transverse process.
  • another manufacturing process for example a so-called longitudinal process, can also be considered.
  • the inner film and the outer film are arranged over the entire surface of the front walls and the side folds and possibly also the bottom, i.e. both films extend over the entire surface.
  • the described sections of the bag body and thus preferably the entire bag body are then designed to be double-walled, but the inner film and the outer film are unconnected to a large extent overall and separate fragments are then formed in the unconnected areas after shredding.
  • the outer film with one is attached to the front walls and/or the side folds imprint is provided.
  • Such a print on the back of the outer film along the line of sight is also referred to as counter-printing.
  • an ink can be provided for a print, which can be detached from the polymer material during a recycling process.
  • the side of the outer film is also exposed, which in the bag body itself initially faces the inner film and which is therefore initially protected on the inside. A print is then protected on the gusseted bag against mechanical damage, abrasion or removal by water, solvents or other liquids.
  • a color can also be used, which can be removed relatively easily after being exposed in the recycling process can.
  • water-based and/or water-soluble colors are suitable.
  • suitable colors can also be removed in a heated alkaline solution at a temperature of, for example, 60°.
  • an edge section of the outer film in the area of the longitudinal sealing seams is unprinted on the front walls or the side folds, preferably on the front walls and the side folds.
  • the inner film is generally not separated from the outer film, even in the recycling process. So if the inner film as a whole and the outer film are unprinted at least at the longitudinal sealing seams, the particles of the composite of outer film and inner film formed at the longitudinal sealing seams are also free of dyes.
  • the bag body based on its polymeric film components, consists of at least 80% by weight, in particular 90% by weight, particularly preferably at least 95% by weight, of polymer of a material class, in particular of polyethylene or made of polypropylene.
  • Non-polymeric materials such as For example, inorganic fillers or polymeric substances such as adhesives and printing inks, which do not form direct film components, are not taken into account.
  • the bag body is made of at least 80%, in particular at least 90%, particularly preferably at least 95%, based on its weight, that is to say its total weight, of polymer of a material class, in particular of polyethylene or polypropylene , is formed. Accordingly, the overall proportion of foreign organic or inorganic materials is low.
  • the inner film and the outer film are essentially made of one type of polymer of one material class and in particular of polyethylene or polypropylene.
  • the particles that remain as a composite are free of dyes during recycling, because then corresponding particles are usually processed together with the inner film, which is also not printed, into high-quality products and in particular packaging such as new gusseted bags can.
  • gusseted bags as packaging a certain amount can be achieved Circulation of the material can be achieved, with an at least partially closed circuit being conceivable if the purity is sufficient.
  • the printing extends up to the longitudinal sealing seam. It can be provided that the print ends directly on the longitudinal sealing seams or at a small distance of a few millimeters, for example a distance of 0.5 mm to 8 mm, in particular 1 mm to 5 mm.
  • the bag body is then opaque or largely opaque. Except for narrow, transparent gaps, the interior of the bag body is then covered, which results in a particularly high-quality appearance and the gusseted bag according to the invention cannot be distinguished by a user from a conventional gusseted bag or can only be distinguished with difficulty. Fragments of granular filling goods such as cereals, pelleted pet food, rice or the like are not noticed. This usually also applies to remaining transparent columns if they are sufficiently narrow as described.
  • fragments can remain in the area of the longitudinal sealing seams during recycling, which are not only formed from a longitudinal sealing seam but also in front of an adjacent printed section of the outer film. It should be taken into account that a shredding process produces fragments of different sizes and a certain statistical distribution. However, if such a fragment with a partial print is sorted out as printed and the ink is then subsequently washed off, very high-quality recycling is again possible. Because the print is preferably not inserted into the longitudinal sealing seam, such fragments can also be easily washed off after the initially hidden print has been exposed.
  • the inner film and the outer film are partially unconnected to one another on the front walls and the side folds in order to be able to form separate particles or fragments there during recycling.
  • the proportion of unconnected areas is as large as possible.
  • a kind of frame is then created on the front walls, with a usual rectangular shape of the front walls, a rectangular surrounding frame.
  • the inner film and the outer film are unconnected over 80%, in particular 90%, of the covered area on the front walls and the side folds.
  • the bag body is provided with a weakening line
  • a local connection of the inner film and the outer film can ensure that they tear together.
  • the weakening line it can then be provided, for example, that only the inner film or the outer film is weakened, removed or notched, for example with a laser, with the sectional connection in the area of the weakening line then resulting in a uniform, as linear as possible crack propagation in the area of the weakening line outer film and the inner film is achieved.
  • the inner film and the outer film are connected to one another, in particular glued and/or connected by heat sealing, at least along a strip running along the transverse direction, the bag body having the previously described functional structure in the area of the strip. It is then also possible for an imprint to be left out locally in such an area. The missing print can then also visually highlight a corresponding functional structure to make it easier for the user to operate. It is also conceivable that the outer film is printed on the weakening line, particularly on its outer sides, i.e. in a face print, in order to identify the weakening line in a precise position. In a washable design, the beautiful print is then exposed on the outside of the bag body. In order to be able to form the weakening line described above as a possible functional structure, the outer film or the Inner film or a layer of the inner film or the outer film can also be used a laser additive.
  • a sectional, in particular linear connection of the inner film and the outer film can be useful in order to be able to handle the film web easily. If, for example, adhesive is applied to the edges of such a film web and/or in areas of subsequently formed separating or folding lines, the glued areas can optionally also be subsequently removed by trimming the edges of the gusseted bag, for example to a largely or completely adhesive-free Provide side gusset bags.
  • a reclosure which is applied to the inner film on the inside of the front walls.
  • a reclosure can optionally be particularly highlighted by omitting the print.
  • the bag body is bordered on the circumference by the front walls and the side folds.
  • the previously mentioned bottom is provided, which is then connected to the front walls and the side folds via bottom sealing seams.
  • the bottom sealing seams for connection to the front walls then run in a transverse direction of the bag, while the bottom sealing seams for connection to the side gussets run along a depth in a filled, erected side gusset bag.
  • a standing area can also be formed simply by folding the films, which also form the front walls that the transition from the front walls to the bottom is formed by edges or folded edges.
  • the base When producing the side gusset bag in the transverse process already described (see also EP 2 857 323 B1 ) the base can, for example, be folded from a section adjoining one of the front walls, in which case the bottom sealing seams connecting the base with the side gussets can be produced in the essentially two-dimensional arrangement along the longitudinal direction of the individual gusseted bags, in particular simultaneously with the longitudinal sealing seams.
  • a first film web can be supplied to form one of the front walls with the adjoining base and a second, correspondingly narrower film web can be supplied for the further front wall.
  • the gussets are then supplied separately for the successive gusset bags.
  • the invention is not limited to gusseted bags which are produced in a transverse process. So-called pre-made bags, which are usually first laid flat and then filled, can also be produced in a longitudinal process. In principle, the invention is also suitable for FFS processes (form, fill and seal), in which the bag body is formed and filled immediately one after the other in an integrated process.
  • FFS processes form, fill and seal
  • the inner film is significantly thicker than the outer film on the front walls and/or the side folds.
  • the thickness ratio can be, for example, between 2:1 and 10:1.
  • the inner film is sealed at the longitudinal sealing seams and, if necessary, at other sealing seams and is therefore essential for the closure and the resilience of the bag body. Sufficient thickness is necessary to provide sufficient stability, although the outer film may contribute some stabilization to the bag body.
  • the inner film is preferably unprinted, so that a larger proportion of the material of the bag body, which is formed in particular by the inner film, can be easily recycled simply due to the thickness ratios.
  • the use of soluble colors for the outer film is only optional, so that recycled material obtained from the outer film can then have a lower quality due to remaining dyes.
  • insoluble printing inks it is also possible to accept corresponding discolorations when the corresponding particle fraction is recycled separately, for example in order to produce lower-quality products in which the coloring is of minor importance or is subsequently changed by adding further dyes in the manufacturing process. Dark gray or black coloring is usually also possible with colored recycled particles.
  • the thickness of the inner film is between 80 ⁇ m and 200 ⁇ m.
  • the outer film can, for example, have a thickness between 15 ⁇ m and 50 ⁇ m.
  • the inner film preferably has the same thickness and is made of the identical material.
  • the sections can also be at least partially cut from a common film web.
  • the front walls and any floor provided can be formed from a first film web and the side folds from a second film web.
  • variations in the thickness and material of the inner film can also be provided to a certain extent for the front walls, the side folds and/or the bottom fold. Corresponding considerations apply equally to the outer film.
  • the gusseted bag according to the invention is preferably designed or provided as a gusseted packaging bag.
  • Corresponding gusseted bags are often produced as pre-made bags, particularly in the transverse process described above.
  • the bag body which is formed from the front walls, the side folds and, if necessary, a bottom fold, is first left open at an upper edge and then filled and closed.
  • the production of the gusseted bag on the one hand and the filling and closing on the other hand are usually carried out at different production sites, whereby the prefabricated gusseted bag can be easily stacked, transported and stored.
  • the present invention relates to both the prefabricated and the fully filled and closed gusseted bag.
  • the side folds are folded along a center line between the front walls, with the bag body being open at an upper edge.
  • the invention equally relates to the gusseted bag when the bag body is filled with a filling material and, in particular, is sealed in an airtight manner.
  • the filling material is then well protected against external influences, although depending on the design of the bag body and depending on the filling material contained, ventilation and/or venting valves, perforation or the like are not excluded.
  • the inner film In order to be able to produce the longitudinal sealing seams and other sealing seams, the inner film should be easily sealable to itself on its side facing a filling space of the bag body. At the same time, it is advantageous if the structure of the outer film is not affected too much during such a sealing process and, in particular, does not melt.
  • the inner film has a lower softening or melting temperature than the outer film, at least on its inside.
  • Corresponding differences in heat sealability can, for example, also be achieved within a single material class by selecting suitable polymer types.
  • the outer film is oriented, in particular monoaxially oriented, whereby the sealing strength is increased.
  • the inner film can be designed as a multilayer film, in particular as a multilayer coextrusion film.
  • the layer of the inner film on the inside of the bag body then expediently has a comparatively low melting point and good heat-sealability against itself.
  • the outside adjoining the outer film on the opposite side of the inner film can be formed from a material which can be sealed particularly well against the preferably monoaxially oriented outer film.
  • the inner film can also have a core layer.
  • a MDO-PE/PE layer structure results in particular, and based on this representation, multi-layer configurations of the outer film and the inner film also come into consideration.
  • a biaxially oriented, possibly multi-layered outer film can also be used, so that a BO-PE/PE layer structure then results.
  • a PE/PE layer structure is also possible if suitable different types of PE are used with regard to heat sealing and/or further measures are provided for the production of sealing seams, particularly in the area of the side folds. It is conceivable, for example, that separating strips are inserted into the side folds during heat sealing and/or a protective varnish (anti-sealing varnish) is applied.
  • a barrier layer can be provided both for the outer film and preferably for the inner film.
  • a barrier layer especially for oxygen.
  • EVAL/EVOH ethylene vinyl acetate copolymer
  • PVAL/PVOH polyvinyl alcohol
  • the thickness being, for example, between 0.5 ⁇ m and 5 ⁇ m.
  • PE/HV/EVOH/HV/PE with adhesion promoter layers, which adjoin a central layer made of EVOH is conceivable for the inner film.
  • a thin barrier layer based on EVOH or PVOH is harmless in many cases.
  • a barrier layer in particular for oxygen, can also be applied as a barrier coating, in particular as a barrier varnish.
  • a barrier lacquer can be formed, for example, based on PVOH.
  • the external barrier coating usually impairs heat sealability.
  • a corresponding sealing tool can be designed so wide that it also overlaps the edge of the barrier varnish. This then ensures that the barrier varnish extends directly to the corresponding sealing seam.
  • the outer film is in a counterprint with the print and the inner film is in a face print with the barrier varnish.
  • the Fig. 1 shows a gusseted bag with a bag body 3 having a first front wall 1a, a second front wall 1b and two side gussets 2.
  • the bag body 3 also has a rectangular base 4 on which the bag body 3 is placed.
  • the front walls 1a, 1b are connected to the side gussets 2 via longitudinal sealing seams 5.
  • the bottom 4 connects to the front walls 1a, 1b or the side folds 2 via bottom sealing seams 6a, 6b.
  • Fig. 1 From the Fig. 1 It can be seen that the side folds 2 end below an upper edge of the bag body 3, which is closed with a top seal seam 7 running along a transverse direction of the bag. Below The top seal seam 7 has a weakening line 8 for tearing off an upper bag section and an internal reclosure 9.
  • the Fig. 2 shows the gusseted bag with the bag body 3 in a flat state, with the upper edge of the bag not yet closed with the top seal seam 7 and therefore accessible.
  • the front walls 1a, 1b, the side folds 2 and the bottom 4 are each formed from an inner film 10 and an outer film 11, which are partially unconnected to one another.
  • the inner film 10 and the outer film 11 are unconnected over a large part of the covered area and in particular over at least 80% of the covered area.
  • the inner film 10 and the outer film 11 are additionally glued to one another in an area 12 that runs in strips along the transverse direction or, alternatively, sealed to one another.
  • the strip-shaped area 12 immediately adjoining the upper edge of the bag is small compared to the total area of the front walls 1a, 1b.
  • the strip-shaped area 12 can be opened with suction cups or the like, starting from the flat state shown, in order to then be able to fill the bag body 3 and then close it. Without gluing or one Connecting the inner film 10 to the outer film 11 in another way would pose the risk that the inner film 10 and the outer film 11 would not be grasped together during handling, so that reliable opening of the bag body 3 would then not be possible or would at least be more difficult.
  • the weakening line 8 and the reclosure 9 are also located on the strip-shaped area 12.
  • the weakening line as material removal, notch, incision or the like only in the inner film 10 or preferably the Outer film 11 is formed, with the weakening line 8 then ensuring a controlled tearing of the interconnected inner film 10 and outer film 11. Bonding can also be useful in the area of the reclosure 9 in order to enable safe and intuitive handling there.
  • the side folds 2 and the bottom 4 are inserted between the front walls 1a, 1b. So that the side gussets 2 can end below the upper edge of the bag, the side gussets 2 are bent outwards at an angle. The side folds 2 are thereby tightly integrated into the longitudinal sealing seams 5 at their upper end.
  • the Fig. 3 shows a highly schematic horizontal section through the flat-lying gusseted bag according to the Fig. 2 .
  • both front walls 1a, 1b and the side folds 2 are formed in the same way from the inner film 10 and the outer film 11, the inner film 10 having a greater thickness than the outer film 11.
  • the thickness ratio can, for example, be in a range between 2:1 and 10:1.
  • the inner film can in particular have a thickness between 80 ⁇ m and 200 ⁇ m, while the outer film 11, for example, has a thickness between 15 ⁇ m and 50 ⁇ m can have.
  • FIG. 4 shows a transition from one of the front walls 1a to one of the side folds 2.
  • the inner film 10 is formed in three layers with an inner layer 13, a core layer 14 and an outer layer 15, in particular by coextrusion.
  • the inner layer 13 has good heat sealability against itself in order to close the bag body 3 on the circumference along the longitudinal sealing seams 5.
  • the outer layer 15 adjoins the outer film 11, which is designed as a monoaxially oriented monofilm.
  • the outer layer 15 is selected so that good sealability results from the monoaxially oriented outer film 11.
  • the bag body 3 is made of at least 80%, in particular at least 90% and particularly preferably at least 95% of polymer of a material class, in particular polyethylene or polypropylene.
  • the inner film 10 and the outer film 11 are expediently made of a single type or essentially of a single type of polymer of a material class and in particular of the previously mentioned materials polyethylene or polypropylene. Such a design also enables the entire bag body or the particles formed during shredding to be recycled according to type.
  • the Fig. 4 It can be seen that the outer film 11 is provided with an imprint 16 on its side facing the inner film 10. The print 16 ends shortly before the longitudinal sealing seams 5.
  • the inner film 10 and the outer film 11 are mainly formed into separate, separate particles. because the inner film 10 and the outer film 11 are unconnected over a large part of the bag body 3.
  • the inner film 10 is unprinted, so that after appropriate sorting, the particles formed only from the inner film 10 can then be processed very easily after separation into a high-quality recycled product and in particular also again into a gusseted bag.
  • the print 16 can also be formed with a soluble ink, which can be removed, for example, in a warm alkaline bath. After the color has been washed out, high-quality recycling of the outer film 11 is then possible.
  • the gusseted bag according to the invention allows different procedures for recycling. For example, if, as described, the print 16 is formed by a soluble ink, then after shredding, the entire shredded material can also be subjected to a bath to remove the ink, regardless of whether individual particles are printed or unprinted. The shredding then essentially serves to expose the initially internal printed side of the outer film 11.
  • the particles of the outer film 11 provided with the imprint 16 are expediently removed and recycled separately, thermally recycled or otherwise used or disposed of.
  • the different thicknesses of the outer film 11 and the inner film 10 are advantageous. The different thickness can also make the process easier with regard to different separation processes such as air classifying.
  • the outer film 11 can be formed, for example, from a monoaxially oriented transparent monofilm made of HDPE with a thickness of 25 ⁇ m.
  • the printing ink for the print is water-based or water-soluble and can be removed in a bath in the manner described.
  • the inner film 10 is coextruded in three layers and is transparent.
  • An inner layer 13 is then provided in the three-layer structure, which seals against itself at low temperatures.
  • a two-component PUR laminating adhesive K2-PUR
  • K2-PUR two-component PUR laminating adhesive
  • the Fig. 5 shows a material web from which the first front walls 1a, the second front walls 1b and bottoms 4 are produced for successive side gusset bags.
  • the film web shown is cut into two strips, which are assigned to the first front walls 1a on the one hand and to the second front walls 1b with the adjacent floors 4 on the other hand.
  • a partial connection of the inner film 10 to the outer film 11 is provided by adhesive.
  • a first adhesive strip 17a is provided for the two front walls 1a, 1b, which, when cut in its middle, then forms the previously described strip-shaped area 12 for the first front walls 1a and the second front walls 1b.
  • Further adhesive strips 17b are then provided where the lower edges of the front walls 1a, 1b and edges of the bottoms 4 are formed in the finished bag body 3.
  • the bottom sealing seams 6a are then created at the corresponding points.
  • the adhesive strip 17a in the exemplary embodiment Fig. 5 is also relevant for the function of the reclosure 9 and the weakening line 8 and enables the flattened bag body to be opened, the further adhesive strips 17b are primarily intended to ensure a certain fixation or pre-fixation of the inner film 10 and the outer film 11 to one another during production to ensure.
  • the Fig. 6 shows starting from the Fig. 5 a modification, whereby the adhesive strips 17a, 17b are made narrower.
  • the adhesive strips 17a, 17b serve to be able to guide the film web formed from several layers in a system and are arranged in sections of the film web, which are removed again during bag production by trimming the edges of the bag body 3, also known as trimming.
  • the finished bag body 3 is then completely free of adhesive, which can be advantageous for recycling after use.
  • the width of the middle adhesive strip 17a can be applied Fig. 5 in the embodiment according to Fig. 6 a seal, not shown, can be created.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
EP22197193.0A 2022-09-22 2022-09-22 Sac à soufflets latéraux Pending EP4342812A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22197193.0A EP4342812A1 (fr) 2022-09-22 2022-09-22 Sac à soufflets latéraux
PCT/EP2023/074722 WO2024061652A1 (fr) 2022-09-22 2023-09-08 Sac à soufflets latéraux

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22197193.0A EP4342812A1 (fr) 2022-09-22 2022-09-22 Sac à soufflets latéraux

Publications (1)

Publication Number Publication Date
EP4342812A1 true EP4342812A1 (fr) 2024-03-27

Family

ID=83444866

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22197193.0A Pending EP4342812A1 (fr) 2022-09-22 2022-09-22 Sac à soufflets latéraux

Country Status (2)

Country Link
EP (1) EP4342812A1 (fr)
WO (1) WO2024061652A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1541332A1 (fr) 2002-07-24 2005-06-15 Totani Corporation Machine a fabriquer des sacs
EP2186741B1 (fr) * 2008-11-14 2011-02-09 Nordenia Deutschland Halle GmbH Sac d'emballage
EP2032454B1 (fr) 2006-06-22 2013-01-23 Mondi Halle GmbH Sachet composé d'un film
EP2364848B1 (fr) 2010-02-19 2013-08-28 Mondi Consumer Packaging Technologies GmbH Film, notamment pour emballages déchirables et procédé de fabrication d'un emballage de sac en utilisation ce film
EP2987744B1 (fr) 2014-08-22 2017-07-05 Mondi AG Procédé de fabrication d'un sac d'emballage à soufflet latéral
EP2857323B1 (fr) 2013-10-02 2019-08-28 Mondi Halle GmbH Procédé de fabrication d'un sac d'emballage en film
EP3708511A1 (fr) * 2019-03-13 2020-09-16 Coveris Flexibles France Sac d'emballage a recyclage facilite, et procede de fabrication d'un tel sac
DE102019117119A1 (de) 2019-06-25 2020-12-31 Mondi Ag Folienbeutel
US20220048678A1 (en) * 2020-08-14 2022-02-17 Mondi Ag Packaging bag on a paper basis, as well as method for the production of a packaging bag

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1541332A1 (fr) 2002-07-24 2005-06-15 Totani Corporation Machine a fabriquer des sacs
EP2032454B1 (fr) 2006-06-22 2013-01-23 Mondi Halle GmbH Sachet composé d'un film
EP2186741B1 (fr) * 2008-11-14 2011-02-09 Nordenia Deutschland Halle GmbH Sac d'emballage
EP2364848B1 (fr) 2010-02-19 2013-08-28 Mondi Consumer Packaging Technologies GmbH Film, notamment pour emballages déchirables et procédé de fabrication d'un emballage de sac en utilisation ce film
EP2857323B1 (fr) 2013-10-02 2019-08-28 Mondi Halle GmbH Procédé de fabrication d'un sac d'emballage en film
EP2987744B1 (fr) 2014-08-22 2017-07-05 Mondi AG Procédé de fabrication d'un sac d'emballage à soufflet latéral
EP3708511A1 (fr) * 2019-03-13 2020-09-16 Coveris Flexibles France Sac d'emballage a recyclage facilite, et procede de fabrication d'un tel sac
DE102019117119A1 (de) 2019-06-25 2020-12-31 Mondi Ag Folienbeutel
US20220048678A1 (en) * 2020-08-14 2022-02-17 Mondi Ag Packaging bag on a paper basis, as well as method for the production of a packaging bag

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