EP0537108A2 - Emballage en forme de sac - Google Patents

Emballage en forme de sac Download PDF

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Publication number
EP0537108A2
EP0537108A2 EP92810705A EP92810705A EP0537108A2 EP 0537108 A2 EP0537108 A2 EP 0537108A2 EP 92810705 A EP92810705 A EP 92810705A EP 92810705 A EP92810705 A EP 92810705A EP 0537108 A2 EP0537108 A2 EP 0537108A2
Authority
EP
European Patent Office
Prior art keywords
tear
layer
sealing
jacket part
bag
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Withdrawn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
EP92810705A
Other languages
German (de)
English (en)
Other versions
EP0537108A3 (en
Inventor
Hans Schindler
Andreas Christel
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.)
3A Composites International AG
Original Assignee
Alusuisse Lonza Services Ltd
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 Alusuisse Lonza Services Ltd filed Critical Alusuisse Lonza Services Ltd
Publication of EP0537108A2 publication Critical patent/EP0537108A2/fr
Publication of EP0537108A3 publication Critical patent/EP0537108A3/de
Withdrawn legal-status Critical Current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
    • B65D33/1691—End- or aperture-closing arrangements or devices using adhesive applied to attached closure elements
    • 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
    • B65D75/5855—Peelable seals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3446—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by microwaves
    • B65D81/3461—Flexible containers, e.g. bags, pouches, envelopes

Definitions

  • the present invention relates to a gas- and liquid-tight bag packaging for fillable goods which can be heated by microwave treatment, comprising a jacket part or a jacket and a bottom part, made of flexible plastic film, the front and back of the jacket part and the optionally present bottom part being connected to one another in a sealed manner by sealing seams .
  • bags and in particular stand-up bags made of thermoplastic or composite material consisting of two side walls with a folded bottom or two separate side walls and a third pre-folded bottom film, the volume restricting adhesive welds or pressure sensitive adhesives being attached, which are attached release a strong increase in pressure so that voltage peaks are dampened by increasing the volume at these points.
  • the object of the present invention is to provide a bag packaging which can be sterilized, pasteurized or filled in hot, for example, and the contents of which can be reheated later by microwave treatment.
  • the contents When the contents are heated, the volume increases, in particular due to vapor formation of the contents.
  • Excessive pressure build-up in the gas and liquid-tight bag packaging is to be prevented by an automatic overpressure relief at a predetermined point on the bag packaging and finally an easy opening of the bag packaging for removal of the contents is to be made possible.
  • the jacket part is formed from plastic film, which contains a sealing layer on the inside and the bag packaging has a removal opening in the region of the upper end of the jacket part, which is closed with a tear-off strip made of flexible plastic film
  • the tear strip contains a tear layer on the inside and the tear strip is firmly connected via sealing seams to the inside of the jacket part and at least one sealing seam between the inside of the jacket part and the tear strip is at least partially easily tearable and / or contains at least one tear aid.
  • the casing part contains a front and a rear side and the removal opening at the upper end of the casing part can be formed by folding over the front or the back or both sides and covering and closing the removal opening by a tear strip, the sealing layer the plastic film of the jacket part is sealed by sealing seams against the tear layer of the tear strip.
  • the jacket part contains a front and a rear side
  • the removal opening at the upper end of the jacket part can be formed by the front and rear sides, the removal opening being formed by a seal inserted between the front and rear sides and via sealing seams the inward-facing sides of the front and back and the inside tear layer of the tear strip are covered and sealed with sealing seams.
  • the present invention relates to pouch packaging, the pouches and in particular the jacket part being able to be constructed, for example, from a substantially centrally folded plastic film connected laterally via seams.
  • exemplary embodiments are the connection of two plastic films via two side and one bottom seam or the connection of two bag walls and one, possibly e.g. V-shaped or W-shaped, folded bottom made of plastic foils with marginal seams.
  • bags made up of two bag walls and side inserts connected between the bag walls and connected at the edges, and optionally an inserted bottom.
  • Both the inserts and the bottom can be made from a flat or e.g. V-shaped or W-shaped folded plastic film.
  • a bag made of a plastic film is preferred, which is folded in the middle with an inward V-shaped fold and has lateral seams on the sides, the inward-facing V-shaped fold generally 1/20 to 1 / 3, preferably 1/10 to 1/5, the bag length, respectively. -height matters.
  • V-shaped fold e.g. a W-shaped fold can also be used analogously.
  • the seams at the edges expediently connect the front and back of the jacket part and the legs of an inward-facing V-shaped bottom fold, also at the side edges, so that they are separable from one another. This ensures that e.g. when filling such a bag or when building pressure in such a sealed bag, only the central part of the V-shaped fold can open.
  • a stand-up pouch is formed.
  • the present invention relates to pouch packaging and preferably to stand-up pouches or stand-up pouch packaging.
  • Non-stable bag packaging can also be given a suitable stand, such as a holder, a foot part and the like.
  • Plastic films can be used for the jacket part, the bottom part and the tear strip.
  • Plastic films containing a sealing layer to lie on the inside of the bag can be used for the jacket and bottom part, and plastic films containing a tear layer (peel layer) coming to the inside of the bag can be used for the tear strip.
  • Suitable plastic films can have one or more layers and, in the latter case, can be laminates or film composites.
  • the plastic films expediently contain a barrier layer against gases and vapors.
  • the plastic films can, for example, be made of olefin-based plastics, based on ester, polyamide, vinyl halide or mixtures thereof or contain these plastics.
  • olefin-based thermoplastics examples include polyolefins, such as polyethylene, such as high-density polyethylene (HDPE, density greater than 0.944 g / cm3), medium-density polyethylene (MDPE, density 0.926-0.940 g / cm3), linear medium-density polyethylene (LMDPE) , Density 0.926-0.940 g / cm3), low density polyethylene (LDPE, density 0.910-0.925 g / cm3) and linear low density polyethylene (LLDPE, density 0.916-0.925 g / cm3), polypropylenes, amorphous and crystalline propylenes, isotactic and atactic propylenes and mixtures thereof, poly-1-butene, poly-3-methylbutene, poly-4-methylpentene and copolymers or coextrudates thereof, such as, for example of polyethylene with vinyl acetate, acrylic acid, e.g.
  • polyethylene such as high-density poly
  • ionomer resins such as copolymers of ethylene with about 11% acrylic acid, methacrylic acid, acrylic esters, tetrafluoroethylene or polypropylene, and statistical copolymers, block copolymers or olefin polymer-elastomer mixtures.
  • Ester-based thermoplastics are, for example, polyalkylene terephthalates or polyalkylene isophthalates with alkylene groups or radicals with 2 to 10 carbon atoms or alkylene groups with 2 to 10 C atoms which are interrupted by at least one -0-, e.g. Polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate (polytetramethylene terephthalate), polydecamethylene terephthalate, poly-1,4-cyclohexyldimethylol terephthalate or polyethylene-2,6-naphthalene-dicarboxylate or polyalkylene terephthalate and polyalkylene isophthalate, e.g. 1 to 10 mol%, mixed polymers and terpolymers, as well as block polymers and grafted modifications of the above-mentioned substances.
  • Polyethylene terephthalate polypropylene terephthalate
  • Suitable ester-based thermoplastics are polyalkylene terephthalates with alkylene groups or radicals with 2 to 10 carbon atoms and polyalkylene terephthalates with alkylene groups or radicals with 2 to 10 carbon atoms which are interrupted by one or two -0-.
  • thermoplastics based on esters are polyalkylene terephthalates with alkylene groups or radicals with 2 to 4 carbon atoms, and polyethylene terephthalates are very particularly preferred.
  • the amide-based thermoplastics include, for example, polyamide 6, a homopolymer of ⁇ -caprolactam (polycaprolactan); Polyamide 11, a polycondensate of 11-aminoundecanoic acid (poly-11-aminoundecanamide); Polyamide 12, a homopolymer of ⁇ -laurolactam (polylaurin lactam); Polyamide 6,6, a homopolycondensate of hexamethylene diamine and adipic acid (polyhexamethylene adipamide); Polyamide 6.10, a homopolycondensate of hexamethylene diamine and sebacic acid (polyhexamethylene sebacamide); Polyamide 6, 12 a homopolycondensate of hexamethylene diamine and dodecanedioic acid (polyhexamethylene dodecanamide) or polyamide 6-3-T, a homopolycondensate of trimethylhexamethylene diamine and terephthalic acid
  • vinyl halide-based plastics includes, for example, the polymers of vinyl chloride and vinyl plastics containing vinyl chloride units in their structure, e.g. Copolymers of vinyl chloride with vinyl esters of alphalic acids, in particular of vinyl acetate; Copolymers of vinyl chloride with esters of acrylic and methacrylic acid and with acrylonitrile; Copolymers of vinyl chloride with diene compounds and unsaturated dicarboxylic acids or their anhydrides, such as copolymers of vinyl chloride with diethyl maleate, diethyl fumarate or maleic anhydride; post-chlorinated polymers and copolymers of vinyl chloride; Copolymers of vinyl chloride and vinylidene chloride with unsaturated aldehydes, ketones and others such as acrolein, crotonaldehyde, vinyl methyl ketone, vinyl methyl ether, vinyl isobuyl ether, etc .; Polymers of vinyli
  • Dichlorostyrene chlorinated rubber, chlorinated polymers of chlorobutadiene and their copolymers with vinyl chloride; Rubber hydrochloride and chlorinated rubber hydrochloride; and mixtures of polymers with one another or with other polymerizable compounds and also the corresponding bromides and fluorides.
  • plastic films, laminates or film composites can be preferred a barrier layer against gases and vapors may also be provided.
  • Ceramic barrier layers and plastic barrier layers are suitable, for example.
  • the present invention also relates to pouch packaging whose plastic film of the jacket part or the jacket part and the bottom part and / or the plastic film of the tear strip contains a barrier layer against gases and vapors.
  • Ceramic barrier layers contain, for example, oxides from the series of silicon oxides, aluminum oxides, iron oxides, nickel oxides, chromium oxides or lead oxides or mixtures thereof.
  • the silicon oxides or aluminum oxides are expedient as ceramic barrier layers.
  • the silicon oxides can have the formula SiO x , where x preferably represents a number from 1 to 2, particularly preferably from 1.1 to 1.9 and in particular from 1.2 to 1.7.
  • the aluminum oxides can have the formula Al y O z , where y / z is, for example, a number from 0.2 to 1.5 and preferably from 0.65 to 0.85.
  • the ceramic barrier layers are applied to a substrate, for example by a vacuum thin-film technique, expediently on the basis of electron beam evaporation or resistance heating or inductive heating from crucibles, e.g. applied to a plastic layer or plastic film, as mentioned above. Electron beam evaporation is preferred.
  • the described methods can be carried out reactively and / or with ion support.
  • the ceramic layer can have a thickness of, for example, 5 to 500 nm (nanometers).
  • Plastic barrier layers can, for example, consist of or contain polymers that are particularly gas and water vapor tight. Behave particularly favorably e.g. Layers or foils based on polyvinylidene chlorides, polyolefins, polyvinyl chlorides, acrylonitrile copolymers or biaxially stretched polyethylene terephthalates.
  • the barrier layer of which is a ceramic layer is particularly preferred.
  • the thickness of the single-layer plastic film or the individual plastic film in film composites or laminates can be, for example, 8 to 2000 ⁇ m, preferably 10 to 600 ⁇ m and in particular 10 to 80 ⁇ m.
  • Foil composites or laminates can have the layer structures known per se, such as e.g. containing at least two plastic layers, or containing at least one cellulose-containing layer, such as paper, cardboard, nonwovens and at least one plastic layer.
  • At least one printed, counterprinted or colored layer of a material e.g. a plastic film may be provided.
  • At least one of the layers can be insulating and made of closed-cell plastic foam, e.g. made of polystyrene or other materials such as Crepe paper or similar consist.
  • the different layers e.g. Plastic foils or layers or composites with one another and the plastic foils or layers containing ceramic barrier layers can be connected to one another with laminating adhesives and / or adhesion promoters.
  • Suitable adhesion promoters are, for example, vinyl chloride copolymers, vinyl chloride-vinyl acetate copolymers, polymerizable polyesters, vinylpyridine polymers, vinylpyridine polymers in combination with epoxy resins, butadiene-acrylonitrile-methacrylic acid copolymers, phenolic resins, rubber derivatives, acrylic resins, acrylic resins with phenol or epoxy resins or organosilicon compounds, such as organosilanes.
  • EAA ethylene acrylic acid
  • modified polyolefins such as e.g. modified polypropylene
  • a preferred modified polypropylene is an adduct of maleic anhydride and an ethylene-propylene copolymer. Dispersions of modified polyolefins are very particularly preferred. An example of a dispersion of a modified polypropylene is Morprime (brand name of Morton Chemical Division of Norton Norwich Products, Inc.).
  • adhesion promoters are adhesives such as nitrile rubber-phenolic resins, epoxides, acrylonitrile-butadiene rubber, urethane-modified acrylics, polyester-co-polyamides, hot melt polyester, cross-linked hot-melt polyester polyisocyanates polyisobutylenmod e, styrene-butadiene rubbers, urethanes, ethylene-acrylic acid copolymers and ethylene vinyl acetate -Mixed polymers.
  • adhesives such as nitrile rubber-phenolic resins, epoxides, acrylonitrile-butadiene rubber, urethane-modified acrylics, polyester-co-polyamides, hot melt polyester, cross-linked hot-melt polyester polyisocyanates polyisobutylenmod e, styrene-butadiene rubbers, urethanes, ethylene-acrylic acid copolymers and ethylene vinyl acetate
  • the laminating adhesives can be solvent-containing or solvent-free and also contain water.
  • examples are solvent-based or aqueous acrylate adhesives or solvent-free polyurethane adhesives.
  • Laminating adhesives based on polyurethane are preferred.
  • the plastic films for the jacket and base parts have a sealing layer or sealing wax on the inside.
  • the sealing layers can be used as foils in a thickness of, for example, 10 to 100 ⁇ m or as sealing waxes in a thickness of 1 to 50 ⁇ m.
  • the jacket parts underneath and possibly with the bottom part are e.g. Separately connected by sealed seams.
  • the sealing seams are preferably applied at the edges.
  • the plastic film can also have a sealing layer or varnish on the outside. Corresponding sealing layers have been explained above.
  • the sealing layer or sealing wax can extend over the entire surface of the plastic film or can be present or applied only partially, in the area of the seals to be made.
  • the plastic films for the tear strips have a tear layer (peel layer).
  • the tear layer can be on the plastic film in film form or in layer form, e.g. be arranged on both sides and expediently at least on the surface of the plastic film coming to lie on the inside of the bag.
  • Tear-open layers are known per se and can contain, for example, polyolefins or polyolefin mixtures, optionally with a filler.
  • Suitable polyolefins are, for example, polypropylene, modified polypropylene or polypropylene copolymers, such as ethylene-propylene copolymers, the filler is, for example, talc.
  • tear-open layers are those containing or consisting of an ionomer resin, in particular with about 10% acid content and a high degree of ionic crosslinking; Ethylene acrylic acid copolymers; Ethylene / vinyl acetate copolymers; acid modified EVA copolymers or EVA.
  • tear layers are blends of polypropylene and high pressure polyethylene, blends of polypropylene and polyolefin rubbers.
  • Modified polyesters or glycol-modified polyesters or copolyesters of aromatic polycarboxyl compounds ethylene glycol and an additional glycol are particularly preferred.
  • the aromatic polycarboxyl compounds are e.g. aromatic dicarboxylic acids such as terephthalic acid.
  • the additional glycols can have 3 to 20 carbon atoms and are e.g. Propanediol, butanediol, pentanediol, hexanediol or 1,4-cyclohexanedimethanol.
  • a tear layer containing 40 to 97% by weight of at least one copolyester and 3 to 60% by weight of at least one thermoplastic polymer on acetal, acrylic, amide, carbonate, ester, olefin, styrene or vinyl base.
  • the copolyester is expediently sealable.
  • Suitable copolyesters for such tear-open layers are copolyesters of an aromatic or aliphatic polycarboxyl compound, ethylene glycol and / or another glycol or polyglycol.
  • the aromatic polycarboxyl compounds are expediently aromatic dicarboxylic acids.
  • the aliphatic polycarboxyl compounds are expediently aliphatic dicarboxylic acids.
  • the copolyester can contain other polycarboxylic acids for modification.
  • the proportion of the other polycarboxylic acid for modifying the copolyester can, for example, be up to 30 mol%.
  • aliphatic, alicyclic or aromatic dicarboxylic acids with 4 to 36 carbon atoms such as malonic acid, maleic acid, fumaric acid, succinic acid, glutaric acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, cis- or trans-1,4-cyclohexanedicarboxylic acid, 1,2- or 1,3-cyclohexanedicarboxylic acid, monochloterephthalic acid, such as 2-chloroterephthalic acid, dichloroterephthalic acid, such as 2,5-dichloterephthalic acid, methyl terephthalic acid, dimethyl terephthalic acid, tetrahydrophthalic acid, 4,4′-diphenyldicarboxylic acid, trans-4,4-stilbimedicino acid, Succic acid, sebacic acid, or dodecanedicarboxylic acid can be used.
  • the copolyesters can be prepared either from the acid compound or from
  • the copolyester contains 5 to 97 mol% of ethylene glycol residues and 3 to 95 mol% residues of at least one additional glycol as the glycol or diol portion.
  • Additional glycols are, for example, aliphatic and cycloaliphatic glycols with 3 to 20 C atoms, such as the aliphatic glycols 1,2- or 1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 1,4-butanediol, 1 , 5-pentanediol, 1,6-hexanediol, 1,8-octanediol or the cycloaliphatic glycols 1,3- or 1,4-cyclohexanedimethanol, 2,2-dimethyl-1,3-propanediol, 2,2,4,4 -Tetramethyl-1,3-cyclobutanediol and also diethylene glycol or other suitable diols, as well
  • the preferred copolyester for present tear layers contains an aromatic polycarboxyl compound and in particular terephthalic acid or derivatives thereof and the additional glycol is in particular 1,4-cyclohexanedimethanol.
  • Very preferred copolyesters are glycol-modified polyesters, which are known to experts in the field, for example, as PETG.
  • copolyesters are, for example, the commercially available products "Kodabond 5116" from Eastman Kodak Co. or "SELAR PT 8307” from Du Pont.
  • thermoplastic polymers contained in the tear layer with the copolyester (s) may be based on acetal, acrylic, amide, carbonate, ester, olefin, styrene, or vinyl.
  • thermoplastic polymers which are contained in the tear layer with the copolyester (s) are the polyolefins and in particular polyethylene or polypropylene, furthermore acid- or alcohol-modified copolymers, such as ethylene acrylic acid (EAA) or ethylene-vinyl alcohol copolymers, non-sealable polyesters, especially not sealable polyethylene terephthalates, polyamides, rubber elastomers, for example based on ethylene-propylene-diene elastomers and polycarbonates, in particular based on bisphenol A and phosgene.
  • EAA ethylene acrylic acid
  • ethylene-vinyl alcohol copolymers non-sealable polyesters
  • non-sealable polyesters especially not sealable polyethylene terephthalates
  • polyamides polyamides
  • rubber elastomers for example based on ethylene-propylene-diene elastomers and polycarbonates, in particular based on bisphenol A and phosgene.
  • Polyethylene and in particular LDPE are very particularly preferably used as thermoplastic polymers which are contained in the tear layer with the copolyester (s).
  • a tear-open layer containing 75 to 90% by weight of at least one copolyester and 10 to 25% by weight of at least one thermoplastic polymer is preferred.
  • the tear layer can also contain, for example, 3 to 20% by weight of a filler.
  • Such fillers are known per se and, for example, organic fillers and / or mineral fillers with small particle size, such as chalk, talc, quartz, wollastonite, feldspar, calcined kaolinite clay and the like.
  • Other fillers are, for example, titanium dioxide or other coloring pigments.
  • the plastic film containing the tear-open layer on one side and a sealing layer and / or a colored, printed or counter-printed plastic film or a cellulose-containing layer on the other side If necessary, the plastic film containing the tear-open layer on one side and a sealing layer and / or a colored, printed or counter-printed plastic film or a cellulose-containing layer on the other side.
  • Preferred plastic films for the jacket part and the base part can, for example, be built up from the outside in from a polyester layer, such as a polyester film, a barrier layer, such as a ceramic layer, a further polyester layer, such as a polyester film, and a sealing layer made of polyolefin, for example a polypropylene film be.
  • a polyester layer such as a polyester film
  • a barrier layer such as a ceramic layer
  • a further polyester layer such as a polyester film
  • a sealing layer made of polyolefin for example a polypropylene film be.
  • Plastic foils for the shell part and base part are particularly preferred, comprising a polyethylene terephthalate film, an SiO x layer, where x is a number from 1.2 to 1.7, a polyethylene terephthalate film and a cast polypropylene film.
  • Foil (cPP cast polypropylene) as a sealing layer.
  • the tear strips can be constructed in the same way as described above, with the exception that a tear layer is provided instead of the sealing layer. Tear-off layers made of polypropylene, polypropylene copolymers or sealable polyethylene terephthalate are particularly preferred.
  • the thickness of the individual layers can, for example, for the polyethylene terephthalate layers 10 ⁇ m to 50 ⁇ m, for the ceramic layers 10 nm to 100 nm and for the sealing layer 50 ⁇ m to 80 ⁇ m, respectively. for the tear layer 5 ⁇ m to 80 ⁇ m.
  • plastic films are constructed, for example, containing a polyethylene terephthalate film with a thickness of 10-15 ⁇ m, an SiO x layer, where x is a number from 1.2 to 1.7 and the layer thickness is 10 nm to 100 nm, a further polyethylene terephthalate film with a layer thickness of 10 to 15 ⁇ m and one Sealing layer in the form of a 60 to 70 ⁇ m thick LLDPE film.
  • This application is suitable, for example, for packaging dry food.
  • Another plastic film which is well suited, for example, for the packaging of foodstuffs that can be sterilized, can have a polyethylene terephthalate film with a thickness of 10 to 15 ⁇ m, an SiO x layer, from the outside in, where x is a number from 1.2 to 1 , 7 means and the layer thickness is 10 to 100 nm, contain a further polyethylene terephthalate film with a layer thickness of 10 to 15 ⁇ m and a sealing layer in the form of a 70 to 80 ⁇ m thick cPP film.
  • the pouch packs according to the present invention are joined, for example, by sealing, welding, ultrasonic sealing or welding or gluing in the form of seams on the jacket parts, optionally the base part and the tear strip. Sealing and, in doing so, thermal contact sealing is preferred.
  • the strength of the sealed seams is e.g. in heat contact sealing is influenced by the sealing geometry, the sealing temperature, the sealing pressure and the sealing time. With ultrasonic sealing, the strength of the seams is controlled by the energy parameters.
  • the bag packages according to the present invention have e.g. separable sealed bottom and side seams.
  • the sealing seams are preferably placed so that a stand-up pouch is obtained.
  • a stand-up pouch e.g. a front and a back, which is made by folding a plastic film or by joining two plastic films and attaching side seams and optionally bottom seams a bag.
  • sealing seams running from the top outside downward can be made. This increases the inherent stability and stability of a bag.
  • the side sealing seams at the transition from the 2-layer to the 4-layer (in the area of the V-shaped bottom) bag part are relieved. This latter embodiment is preferred for stand-up pouches.
  • the tear strips are at least partially sealed so that they can easily be torn open and then form at least one easily tearable bag head seam out.
  • the containers produced and sealed in this way are in particular gas and liquid-tight.
  • the bag packaging in the packaging of moisture-containing goods, e.g. from the food sector, can be filled, closed and, if necessary, sterilized under counter pressure. Pasteurization processes and hot filling of the filling goods are also possible.
  • the bag packaging Before the contents are consumed or consumed, the bag packaging can preferably be reheated by microwave treatment in the bag packaging. When a certain increased internal pressure is reached, e.g. due to steam development, an automatic pressure relief takes place by opening the easily tearable seam in the bag head.
  • the easy opening can be promoted by means of a tear-open aid, for example by a sealing seam between the jacket part and the tear-off strip in the form of a tear-off tip directed towards the inside of the bag.
  • the tear strip After relieving the pressure and heating the contents of the bag, the tear strip can be separated from the jacket part along the easily tearable sealing seams. This opens the bag so that the contents can be easily removed.
  • Figures 1 and 1a and 2 and 2a illustrate two different embodiments of the bag packaging according to the invention by way of example.
  • Figure 1 shows the perspective view of a pre-folded plastic film (1).
  • a V-shaped fold (2) is provided, for example, to design a base part.
  • a W-shaped fold can be used instead of a V-shaped one.
  • the recesses (3) are made in the area of the V-shaped fold, here, for example, in a rectangular shape.
  • a tear tab (5) is provided on the back (1a).
  • the presence and design of this pull tab is subject to change and is based on purpose and need.
  • a carrying handle can also be provided, which can optionally simultaneously serve as a tear-open tab. If the pull tab has an opening, the bag can be hung on it, for example.
  • the front (1b) is folded outwards over its entire width at its upper end, for example over 1/3 to 1/20 of the bag height.
  • the inward-facing surface of the plastic film in region (6) thus points outwards with the sealing layer.
  • the two side edges of the front side (1b) can have a slightly smaller width than the bag width in the folded-over area (6) through recesses (7).
  • the recesses (7) should leave about half the width of the side sealing seam at the edges substantially above the height of the folded area (6).
  • the tear strip (8) is provided in at least the width of the rear side (1a) and in height beginning with the lower end of the folded area (6) and preferably ending with the same outline lines as the rear side (1a).
  • the tear strip (8) is e.g. connected to the folded-over area (6) via the seams (10).
  • the plastic film (1) and in particular the front (1b) and the back (1a) are connected to one another.
  • the rear side (1a) and the tear strip (8) are connected to one another via the hatched areas (9) and (9a).
  • the measure can be provided for the purpose that when the volume of the bag increases and the bag is inflated, the folded-over area (6) cannot fold back and the sealing seams are not exposed to undesirable tension forces.
  • a pull tab (11) whose upper limits correspond to the pull tab (5) is shown as an example.
  • FIG. 1a shows a side view of a plastic film and tear strip joined to a bag according to FIG. 1.
  • the upper limit of the V-shaped fold (2) is indicated by an interrupted line, the recesses (3) and the surfaces (4) on which in the area of the V-shaped fold the front and rear side directly e.g. sealed, are indicated by hatching. Likewise, the areas (9, 9a) and the seams (10) via which the tear strip is connected to the front and back of the bag are indicated by hatching.
  • the front and back (1a, 1b) made of the plastic film (1) are connected to each other in a separable manner.
  • the bevel seams (13) increase the stability of the bag and relieve the side seams (12), particularly in the area of the recesses (3).
  • the bevel seams (13) relieve the lateral sealing seams in the area of the transition from the 2-layer to the 4-layer bag part.
  • overlaps or tabs can also be provided.
  • a top seam (14) extending over the entire width of the bag and, in particular, a sealed seam are expediently provided.
  • the head seam (14) preferably has a tear-open aid (15), for example designed as a tear-open tip.
  • the tear-open aid should be designed in such a way that its effect unfolds due to an increase in pressure in the bag, i.e. in the event of a pressure increase in the closed bag, an independent overpressure relief should take place through a partial opening of the head seam (14), in particular in the area of the tear-open aid (15).
  • the pressure is usually built up by heating the contents, e.g. by microwave treatment in a closed bag, e.g. Steam developed.
  • the head seam (14) between the tear strip and the back of the bag can be fully opened and the contents of the bag can be removed.
  • the side seams (12) can also protrude slightly beyond the top seam (14) in order to prevent the top seam from tearing when the bag is opened into the side seams (14).
  • Figure 2 shows the perspective view of a pre-folded plastic film (21), which forms a front (21b), a back (21a) and as a V-shaped fold (22), a bottom.
  • the tear strip (28) is folded in a V-shape at the head end between the front and the back of the bag.
  • Both the V-shaped fold of the bag and the V-shaped fold of the tear strip can e.g. can be replaced by a W-shaped fold.
  • FIG. 2a shows the side view of a manufactured bag from the parts according to FIG. 2.
  • the front and the back of the bag are connected via the side seams (32).
  • One side seam is not flush with the edge of the bag.
  • the protruding bag walls serve as a holding tab when removing the tear strip. These are connected by means of a transverse sealing seam for reinforcement.
  • the V-shaped fold (22) again recesses (23) are shown, which make it possible that the side seams of the front and back in the area of the V-shaped fold touch and are connected to each other. Furthermore, diagonal seams (33) are drawn in, which, as mentioned above, serve to improve the stability of a stand-up pouch and to relieve the side seams.
  • the tear strip (28) is designed on one side, in particular laterally, with a large overlap, that is to say it projects beyond the outer line of the bag.
  • the overlapping part (31) of the tear strip (28) can be folded over to open the pouch and remove the tear strip and can be peeled off via the head seams (34).
  • the arrows show the folding and peeling movement.
  • the head seams (34) connect the back on the one hand and the front on the other hand of the bag, each with one leg of the V-shaped tear strip.
  • the head seam is not straight drawn.
  • a tear-open aid (35) can be provided on at least one of the two head seams (34). The mode of operation is described for FIG. 1a.
  • a W-shaped tear strip can also be used.
  • the plastic film has a sealing layer on the surfaces pointing towards the inside of the bag, and that the tear strip has a tear layer on at least one side.
  • the plastic film is connected to the tear strip via its sealing layer and the tear layer of the tear strip. In particular, this can be done by sealing over sealed seams. Other connections, e.g. Gluing is possible.
  • the parts of the bag such as the front and back and optionally the bottom part, can be firmly connected to one another by means of the sealing layer attached to at least one side of the plastic film, or by gluing via seams.
  • the bag packaging according to the invention expediently has three connections of different strengths, in particular sealing seams.
  • a tear-proof connection and in particular a tear-proof seal is preferably used, the tear strip is preferably partially difficult to tear open with the bag part, preferably connected by seals and at least partially, in particular at least one head seam or easily tearable with a tear-off aid the bag part, preferably connected by sealing.
  • Typical tear forces of the separable connection are greater than 30 N / 15 mm resp. the destruction of the bag next to the separable seams.
  • Typical tear forces of the difficult-to-tear seams of the tear strip are 20 to 30 N / 15 mm.
  • Typical tear forces of the easily tearable top seam are 5 to 20 N / 15 mm.
  • the tensile strength of sealing seams can be influenced via the geometry of the sealing tool, the sealing pressure, the sealing temperature and / or the sealing time. With ultrasonic sealing, the tear forces of the sealed seams can be controlled by varying the influencing parameters.
  • the sealed seams are expediently carried out using a tool with rounded edges.
  • the sealing seams produced with such a tool have higher strengths than those which were produced with a sharp-edged tool.
  • the latter can have a notch effect.
  • this fact can be used to design the seal seams on the tear strip.
  • the sealing pressure depends on the material and the thickness of the plastic film and is typically 1 to 10 kg / cm2 sealing area.
  • the sealing temperature also depends on the material and thickness and can range from 140 ° C to 240 ° C.
  • the sealing is preferably controlled via the temperature and / or time.
  • Temperatures of 190 ° C. to 220 ° C. are preferably used for separable connections. For connections that are difficult to tear open, temperatures of e.g. 180 ° C to 200 ° C applied. For easily tearable connections, for example. Temperatures from 170 ° C to 190 ° C applied.
  • the sealing time can be 0.3 to 3 seconds. be; a sealing time of 0.6 to 1.0 seconds is preferred. for separable connections, from 0.4 to 0.8 seconds. for connections that are difficult to tear open and from 0.5 to 0.6 seconds. for easily tearable connections.
  • the pouches according to the invention are gastight and liquid-tight, ie after filling and closing, no more ingredients can escape from the pouch, or foreign substances can enter the pouch.
  • gas-tightness is understood in particular to mean bags which, for example, have an oxygen diffusion of less than 10,000 cm3 / m2 ⁇ day ⁇ atm, expediently less than 2,000 cm3 / m2 ⁇ day ⁇ atm, preferably less than 100 cm3 / m2 ⁇ day ⁇ atm and in particular show less than 10 cm3 / m2 ⁇ day ⁇ atm.
  • the present invention also relates to the use of the pouch packaging according to the invention and in particular stand-up pouch packaging for packaging filling goods which are heated in particular by microwave treatment.
  • Food and food preparations are primarily considered as filling goods. Such foods can be in liquid, pasty, solid form or a mixture of these forms. Food preparations can also be in liquid, pasty, gelatinous, solid or semi-solid form or represent mixtures of such forms.
  • the food and food preparations can be filled into the bag packaging according to the invention in raw, semi-cooking or cooking form. In practice, the contents are filled into the open-ended bag packaging, the opening is sealed, for example by sealing, and z. B.
  • the filled and closed bag packaging under back pressure the sterilization conditions, for example heating to 121 ° C for 30 minutes, subjected.
  • a bag packaging treated in this way can then be stored for longer periods.
  • the filled and closed pouch packaging can be subjected to a microwave treatment in order to prepare the contents and in particular to reheat it.
  • the volume increases, for example due to steam development.
  • a certain internal pressure which can be, for example, 4 to 10 Pa
  • an automatic pressure relief takes place by automatically opening at least a part of the bag head seam. The pressure is released to the ambient atmosphere down to the ambient pressure.
  • the automatic pressure relief preferably takes place at a predetermined predetermined breaking point, in particular in the area of a tearing aid in the bag head seam.
  • all or part of the bag head seam can be opened easily, for example by hand.
  • the tear strip peels expediently over the bag head seam from the jacket part.
  • the tear strip can be wholly or partially be removed from the jacket part.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Bag Frames (AREA)
  • Packages (AREA)
EP19920810705 1991-09-25 1992-09-14 Bag package Withdrawn EP0537108A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2855/91 1991-09-25
CH2855/91A CH683835A5 (de) 1991-09-25 1991-09-25 Beutelverpackung.

Publications (2)

Publication Number Publication Date
EP0537108A2 true EP0537108A2 (fr) 1993-04-14
EP0537108A3 EP0537108A3 (en) 1993-06-30

Family

ID=4243097

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920810705 Withdrawn EP0537108A3 (en) 1991-09-25 1992-09-14 Bag package

Country Status (3)

Country Link
EP (1) EP0537108A3 (fr)
CA (1) CA2078710A1 (fr)
CH (1) CH683835A5 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0855348A1 (fr) * 1997-01-22 1998-07-29 Kabushiki Kaisha Hoseki Planning Sac scellé pour le chauffage par micro-ondes
US6966697B2 (en) 2002-02-22 2005-11-22 Pactiv Corporation Trash bags with narrowing seals to facilitate gripping
FR2915963A1 (fr) * 2007-05-10 2008-11-14 3G Sarl Sachet de conditionnement
WO2010020453A1 (fr) * 2008-08-19 2010-02-25 Amcor Flexibles Transpac Nv Procédé de production d'emballage à auto-évacuation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1063083B (de) * 1955-07-11 1959-08-06 Ct Nat De Transfusion Sanguine Aufreissband fuer Beutel oder Saeckchen aus thermoplastischem Werkstoff
US3754700A (en) * 1969-06-25 1973-08-28 Rollprint Packaging Prod Inc Surgical pouches
DE2547049A1 (de) * 1975-10-21 1977-05-05 Focke Pfuhl Verpack Automat Tabakbeutel aus kunststoff-folie sowie vorrichtung zum verschliessen desselben
FR2543110A1 (fr) * 1983-03-21 1984-09-28 Vygon Sachet de conditionnement de produits steriles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1063083B (de) * 1955-07-11 1959-08-06 Ct Nat De Transfusion Sanguine Aufreissband fuer Beutel oder Saeckchen aus thermoplastischem Werkstoff
US3754700A (en) * 1969-06-25 1973-08-28 Rollprint Packaging Prod Inc Surgical pouches
DE2547049A1 (de) * 1975-10-21 1977-05-05 Focke Pfuhl Verpack Automat Tabakbeutel aus kunststoff-folie sowie vorrichtung zum verschliessen desselben
FR2543110A1 (fr) * 1983-03-21 1984-09-28 Vygon Sachet de conditionnement de produits steriles

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0855348A1 (fr) * 1997-01-22 1998-07-29 Kabushiki Kaisha Hoseki Planning Sac scellé pour le chauffage par micro-ondes
US5928553A (en) * 1997-01-22 1999-07-27 Kabushiki Kaisha Hoseki Planning Sealed bag for microwave heating
US6966697B2 (en) 2002-02-22 2005-11-22 Pactiv Corporation Trash bags with narrowing seals to facilitate gripping
US7344309B2 (en) 2002-02-22 2008-03-18 Pactiv Corporation Trash bags with narrowing seals to facilitate gripping
FR2915963A1 (fr) * 2007-05-10 2008-11-14 3G Sarl Sachet de conditionnement
WO2008152247A2 (fr) * 2007-05-10 2008-12-18 3G Sachet de conditionnement
WO2008152247A3 (fr) * 2007-05-10 2009-02-12 3G Sachet de conditionnement
CN103298711A (zh) * 2007-05-10 2013-09-11 3G公司 包装袋
CN103298711B (zh) * 2007-05-10 2015-03-18 3G公司 包装袋
WO2010020453A1 (fr) * 2008-08-19 2010-02-25 Amcor Flexibles Transpac Nv Procédé de production d'emballage à auto-évacuation
RU2478073C2 (ru) * 2008-08-19 2013-03-27 Амкор Флексиблз Транспак Нв Способ изготовления упаковки с самостоятельным выпуском воздуха
US9409691B2 (en) 2008-08-19 2016-08-09 Amcor Flexibles Transpac N.V. Method for the production of self-venting packaging

Also Published As

Publication number Publication date
EP0537108A3 (en) 1993-06-30
CH683835A5 (de) 1994-05-31
CA2078710A1 (fr) 1993-03-26

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