WO1992004187A1 - Cover for food product package and method for producing said cover - Google Patents

Cover for food product package and method for producing said cover Download PDF

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Publication number
WO1992004187A1
WO1992004187A1 PCT/FI1991/000277 FI9100277W WO9204187A1 WO 1992004187 A1 WO1992004187 A1 WO 1992004187A1 FI 9100277 W FI9100277 W FI 9100277W WO 9204187 A1 WO9204187 A1 WO 9204187A1
Authority
WO
WIPO (PCT)
Prior art keywords
polymer
cover
paper
layer
heat
Prior art date
Application number
PCT/FI1991/000277
Other languages
French (fr)
Inventor
Riitta Koskiniemi
Matti Salste
Tapani Penttinen
Original Assignee
Enso-Gutzeit Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FI904486A external-priority patent/FI904486A/en
Application filed by Enso-Gutzeit Oy filed Critical Enso-Gutzeit Oy
Publication of WO1992004187A1 publication Critical patent/WO1992004187A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

Definitions

  • the present invention relates to a paper cover, which is oxygen-impermeable, heat-sealable cnto a container with and peelably openable along a heat-sealed seam, for a food product package; said cover being at its inside surface facing the container coated with polymer coat layers, of which the innermost layer forms a hermetically sealed and readily heat-sealable seam between said container and the cover.
  • a heat-sealable cover of a package is used in unit packaging of food products, in particular those of the liquid-containing kind such as yoghurt, sourmilk, milk, juices, desserts and the like.
  • the cover must provide sufficient hermeticity and hygiene.
  • the commonest cover material has been aluminium foil whose heat-sealing onto the rims of the container has been implemented by means of lacquer.
  • aluminium foil covers With the increasing demands for environmental compati ⁇ bility set on packaging, aluminium foil covers have become handicapped by the fact that they are nondegrad- able in waste processing. The aluminium foil cover is readily torn, yet not easy to open peelably along its seam line. Furthermore, aluminium covers are produced in an energy-consuming process which is deleterious to the environment and leads to high production costs.
  • food product package covers made of paper coated by plastic layers in order to attain impermea ⁇ bility and heat-sealability, but the shelf life of products packaged using these covers has not matched that available with the use of an aluminium foil cover.
  • the paper cover according to the invention for a food product package is characterized by having its inside coat layers formed by a polymer bonding layer, a polymer layer of oxygen-impermeable material, another polymer bonding layer and a heat-sealable polymer layer.
  • the essential characteristic of the paper cover according to the invention for a food product package is its capability of preventing the penetration of oxygen from ambient atmosphere through the cover into the container.
  • oxygen causes a gradual degradation of product quality by oxidizing i.a. fats, flavour substances and vitamins contained in the product.
  • An additional benefit of the polymer layer combination used to prevent oxygen from entering the package is its capability of preventing aroma substances from escaping the package.
  • the cover is readily and nontearingly openable (peelable) along the heat-sealed seam. Thence, the paper cover according to the invention for a food product package renders the product such a shelf life and ease- of-use that facilitates the use of a paper cover that can replace aluminium foil covers in the packaging of easily decaying or degrading food products.
  • a polymer suitable for use as an oxygen barrier in the paper cover according to the invention for a food product package is ethylvinyl alcohol polymer (EVOH) .
  • Exemplifying the bonding materials, which are compatible with said polymer can be mentioned, e.g., appropriately modified polyethene that can be laminated in either one or in both bonding layers with the EVOH layer. Thickness of the EVOH layer can be varied in the range 2...15 g/m 2 , preferably 4...10 g/m 2 .
  • polyethene terephtalate (PET) whereby grafted polyethene can be employed as a compatible bonding material
  • PET polyethene terephtalate
  • PA polyamide
  • Thickness of the PET layer can be in the range 5...30 g/m 2 , preferably 10...20 g/m 2 .
  • Thickness of the PA layer can be in the range 3...20 g/m 2 , preferably 5...10 g/m 2 .
  • Thickness of each bonding material layer can be in the range 2...15 g/m 2 , preferably 4...10 g/m 2 .
  • the outermost heat-sealable polymer layer of the polymer multilayer system of the cover contains a polymer, such as methacrylic acid and ethylvinyl acetate modified polyethene acting as the adhering component, and a polymer such as a copolymer of ethene methacrylic acid acting as the releasing component.
  • Thickness of the heat- sealable polymer layer can be in the range 5...40 g/m 2 , preferably 10...30 g/m 2 .
  • Paper material of the cover can be, e.g., sulfate pulp based, bleached, filler-containing and coated paper grade with a basis weight in the range 30...200 g/m 2 , preferably 50...120 g/m 2 .
  • the cover paper can be either coated or left uncoated on its other side, which is not coated by said polymer layers, and thus forms the outer side of the package.
  • the invention also concerns a method for producing the paper cover described above for a food product package.
  • the paper base material is simultaneously coated with several polymer coat layers of which the uppermost is of a heat-sealable polymer or blended polymer material and is characterized in that the coat layers, which comprise a polymer bonding layer, an oxyge -barrier forming pol mer layer, a second polymer bonding layer and a heat-sealable polymer layer, are applied in molten state against each other and at the same time against a moving paper web, and in that the paper coated thereby is used for fabricating said cover by pressing the paper against the rim of a ready-filled food product container and then adhering the cover by heat-sealing.
  • Figure 1 shows a food product package sealed by a paper cover according to the invention
  • Figure 2 shows a cross-sectioned detail of the seam between said package and the sealing paper cover
  • Figure 3 shows the cross-sectioned detail of said cover in a greater scale
  • Figure 4 shows schematically the manufacturing process of the paper cover material.
  • Fig. 1 Shown in Fig. 1 is a disposable unit package 1 of a liquid-containing food product such as yoghur .
  • the package 1 comprises a container 2 and an easily detachable (peelable) paper cover 3 according to the present invention, said cover being heat-sealed onto the rim of said container.
  • the container 2 can be of any plastic conventionally used in food packaging such as polypropene or polystyrene, or alternatively, cardboard coated with LD polyethene.
  • the material of the container is irrelevant to the invention; for practical reasons, however, its degree of impermeability can be assumed to be at least as high as that of the cover.
  • the paper cover 3 which is attached by heat-sealing to the package comprises a paper web layer 4 acting as a carrier for a polymer multilayer system 5 facing the inside of the package, said multilayer system being comprised of four superimposed polymer layers of which the innermost forms a heat- sealable seam 6 between the rim of the container 2 and said cover 3.
  • the polymer coat 5 renders the cover an easy detachment and good hermeticity, which prevents the packaged product 7 from decaying.
  • Fig. 3 illustrates the polymer layers forming the inside coat 5 of the cover paper 4.
  • the polymer bonding layer 8 Closest to the paper 4 is the polymer bonding layer 8, next is a layer of oxygen- barrier forming polymer layer 9, next to it is another polymer bonding layer 10, and finally outermost from the paper, the polymer layer 11 which provides the heat- sealable seam 6.
  • the latter is advantageously composed of a blended polymer material containing an adhering component that facilitates heat-sealing and a releasing component that facilitates the detachment of the cover along the heat-sealed seam without tearing the cover.
  • an essential impetus is given by the oxygen-barrier forming polymer layer 9 that gives the cover the impermeability required for a satisfactory shelf life of the packaged product.
  • the polymer material of the layer 9 can be, e.g., ethylvinyl alcohol copolymer, whereby modified polyethene can be selected as the material of the polymer bonding layers 8, 10.
  • modified polyethene can be selected as the material of the polymer bonding layers 8, 10.
  • the heat-sealable polymer layer 11 can consist of methacrylic acid and ethylvinyl acetate modified polyethene as an adhering compound and a copolymer of ethenemethacrylic acid as a releasing compound.
  • the fabrication of the paper cover according to the invention takes place as a continuous process by routing a continuous paper web 4 to the nip formed between rolls 14, 15, whereby the film webs of the polymer layers 8...11 to be superimposed on the cover base material are simultaneously routed from nozzles 16 to the same nip.
  • the nozzles 16 communicate with containers 17...19, from which the polymer bonding material (container 17) , oxygen-barrier forming polymer (container 18) .nd heat-sealab_e polymer (container 19) are fed in molten state to said nozzles.
  • the molten polymer layers 8...11 are first aimed against each other, after which they are applied in a single run to the paper 4 in the nip formed between said rolls 14, 15.
  • a coated paper web is obtained suitable for the stamping of the covers according to the invention either prior to the fill/heat- sealing stage of the package, or alternatively, in conjunction with this stage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)
  • Packages (AREA)

Abstract

The invention concerns a paper cover (3) for a food product and a method for producing said cover. The cover is intended for the packaging of food products, in particular those of the liquid-containing kind such as yoghurt, milk, juices, and the like. The cover is coated on its inner surface with polymer coat layers (5). The invention is characterized in that the inside coat layers on the base material (4) of said paper cover are comprised of a polymer bonding layer (8), an oxygen-barrier forming polymer layer (9), another polymer bonding layer (10) and a heat-sealable polymer layer (11).

Description

COVER FOR FOOD PRODUCT PACKAGE AND METHOD FOR PRODUCING SAID COVER
The present invention relates to a paper cover, which is oxygen-impermeable, heat-sealable cnto a container with and peelably openable along a heat-sealed seam, for a food product package; said cover being at its inside surface facing the container coated with polymer coat layers, of which the innermost layer forms a hermetically sealed and readily heat-sealable seam between said container and the cover.
A heat-sealable cover of a package is used in unit packaging of food products, in particular those of the liquid-containing kind such as yoghurt, sourmilk, milk, juices, desserts and the like. Here, the cover must provide sufficient hermeticity and hygiene. The commonest cover material has been aluminium foil whose heat-sealing onto the rims of the container has been implemented by means of lacquer.
With the increasing demands for environmental compati¬ bility set on packaging, aluminium foil covers have become handicapped by the fact that they are nondegrad- able in waste processing. The aluminium foil cover is readily torn, yet not easy to open peelably along its seam line. Furthermore, aluminium covers are produced in an energy-consuming process which is deleterious to the environment and leads to high production costs. Known in the art are food product package covers made of paper coated by plastic layers in order to attain impermea¬ bility and heat-sealability, but the shelf life of products packaged using these covers has not matched that available with the use of an aluminium foil cover.
It is an object of the present invention to provide a paper cover for a food product container, said paper cover being manufacturable by a simple process and offering a degree of hermeticity sufficient for assuring a long shelf life even for sensitive and easily decaying ood products. The paper cover according to the invention for a food product package is characterized by having its inside coat layers formed by a polymer bonding layer, a polymer layer of oxygen-impermeable material, another polymer bonding layer and a heat-sealable polymer layer.
The essential characteristic of the paper cover according to the invention for a food product package is its capability of preventing the penetration of oxygen from ambient atmosphere through the cover into the container. In general, oxygen causes a gradual degradation of product quality by oxidizing i.a. fats, flavour substances and vitamins contained in the product. An additional benefit of the polymer layer combination used to prevent oxygen from entering the package is its capability of preventing aroma substances from escaping the package. By virtue of the heat-sealable polymer layer, the cover is readily and nontearingly openable (peelable) along the heat-sealed seam. Thence, the paper cover according to the invention for a food product package renders the product such a shelf life and ease- of-use that facilitates the use of a paper cover that can replace aluminium foil covers in the packaging of easily decaying or degrading food products.
A polymer suitable for use as an oxygen barrier in the paper cover according to the invention for a food product package is ethylvinyl alcohol polymer (EVOH) .
Exemplifying the bonding materials, which are compatible with said polymer, can be mentioned, e.g., appropriately modified polyethene that can be laminated in either one or in both bonding layers with the EVOH layer. Thickness of the EVOH layer can be varied in the range 2...15 g/m2, preferably 4...10 g/m2. As alternative polymers suitable for use as an oxygen barrier can be noted polyethene terephtalate (PET) , whereby grafted polyethene can be employed as a compatible bonding material, and polyamide (PA) , whereby a copolymer of ethene and unsaturated carboxylic acid can be employed, as a compatible bonding material. Thickness of the PET layer can be in the range 5...30 g/m2, preferably 10...20 g/m2. Thickness of the PA layer can be in the range 3...20 g/m2, preferably 5...10 g/m2.
Thickness of each bonding material layer can be in the range 2...15 g/m2, preferably 4...10 g/m2.
The outermost heat-sealable polymer layer of the polymer multilayer system of the cover contains a polymer, such as methacrylic acid and ethylvinyl acetate modified polyethene acting as the adhering component, and a polymer such as a copolymer of ethene methacrylic acid acting as the releasing component. Thickness of the heat- sealable polymer layer can be in the range 5...40 g/m2, preferably 10...30 g/m2.
Paper material of the cover can be, e.g., sulfate pulp based, bleached, filler-containing and coated paper grade with a basis weight in the range 30...200 g/m2, preferably 50...120 g/m2.
The cover paper can be either coated or left uncoated on its other side, which is not coated by said polymer layers, and thus forms the outer side of the package.
The invention also concerns a method for producing the paper cover described above for a food product package. In the method the paper base material is simultaneously coated with several polymer coat layers of which the uppermost is of a heat-sealable polymer or blended polymer material and is characterized in that the coat layers, which comprise a polymer bonding layer, an oxyge -barrier forming pol mer layer, a second polymer bonding layer and a heat-sealable polymer layer, are applied in molten state against each other and at the same time against a moving paper web, and in that the paper coated thereby is used for fabricating said cover by pressing the paper against the rim of a ready-filled food product container and then adhering the cover by heat-sealing.
The invention is next examined in greater detail with the help of an exemplifying embodiment illustrated in the attached drawings, in which
Figure 1 shows a food product package sealed by a paper cover according to the invention,
Figure 2 shows a cross-sectioned detail of the seam between said package and the sealing paper cover,
Figure 3 shows the cross-sectioned detail of said cover in a greater scale, and
Figure 4 shows schematically the manufacturing process of the paper cover material.
Shown in Fig. 1 is a disposable unit package 1 of a liquid-containing food product such as yoghur . The package 1 comprises a container 2 and an easily detachable (peelable) paper cover 3 according to the present invention, said cover being heat-sealed onto the rim of said container.
The container 2 can be of any plastic conventionally used in food packaging such as polypropene or polystyrene, or alternatively, cardboard coated with LD polyethene. The material of the container is irrelevant to the invention; for practical reasons, however, its degree of impermeability can be assumed to be at least as high as that of the cover.
According to Fig. 2, the paper cover 3 which is attached by heat-sealing to the package comprises a paper web layer 4 acting as a carrier for a polymer multilayer system 5 facing the inside of the package, said multilayer system being comprised of four superimposed polymer layers of which the innermost forms a heat- sealable seam 6 between the rim of the container 2 and said cover 3. In addition to its heat-sealability, the polymer coat 5 renders the cover an easy detachment and good hermeticity, which prevents the packaged product 7 from decaying.
Fig. 3 illustrates the polymer layers forming the inside coat 5 of the cover paper 4. Closest to the paper 4 is the polymer bonding layer 8, next is a layer of oxygen- barrier forming polymer layer 9, next to it is another polymer bonding layer 10, and finally outermost from the paper, the polymer layer 11 which provides the heat- sealable seam 6. The latter is advantageously composed of a blended polymer material containing an adhering component that facilitates heat-sealing and a releasing component that facilitates the detachment of the cover along the heat-sealed seam without tearing the cover.
For the purpose of the invention, an essential impetus is given by the oxygen-barrier forming polymer layer 9 that gives the cover the impermeability required for a satisfactory shelf life of the packaged product. The polymer material of the layer 9 can be, e.g., ethylvinyl alcohol copolymer, whereby modified polyethene can be selected as the material of the polymer bonding layers 8, 10. However, other material combinations than those mentioned above are also possible. The heat-sealable polymer layer 11 can consist of methacrylic acid and ethylvinyl acetate modified polyethene as an adhering compound and a copolymer of ethenemethacrylic acid as a releasing compound.
According to Fig. 4, the fabrication of the paper cover according to the invention takes place as a continuous process by routing a continuous paper web 4 to the nip formed between rolls 14, 15, whereby the film webs of the polymer layers 8...11 to be superimposed on the cover base material are simultaneously routed from nozzles 16 to the same nip. The nozzles 16 communicate with containers 17...19, from which the polymer bonding material (container 17) , oxygen-barrier forming polymer (container 18) .nd heat-sealab_e polymer (container 19) are fed in molten state to said nozzles. As is evident from Fig. 4, the molten polymer layers 8...11 are first aimed against each other, after which they are applied in a single run to the paper 4 in the nip formed between said rolls 14, 15. As a result a coated paper web is obtained suitable for the stamping of the covers according to the invention either prior to the fill/heat- sealing stage of the package, or alternatively, in conjunction with this stage.
For those versed in the art it is evident that the invention is not limited by the exemplifying embodiment described above, but instead, its applicability can be varied within the scope of the enclosed claims.

Claims

WHAT IS CLAIMED IS:
1. A paper cover (3) for a food product container, said paper cover (3) being heat-sealable onto said container (2) with and peelable along a heat-sealed seam (6) , said cover being coated at its inside surface facing said container with polymer material coat layers (8...11) of which the top layer (11) facing the inside of the container forms said hermetically sealed and readily peelable heat-sealed seam (6), c h a r a c t e r i z e d in that the inside coat layers on the base material of said paper cover (4) are formed by a polymer bonding layer (8) , a polymer layer of oxygen-impermeable material (9) , another polymer bonding layer (10) and a heat- sealable polymer layer (11) .
2. A paper cover for a food product package as defined in claim 1, c h a r a c t e r i z e d in that the polymer layer facing the base paper web (4) is of the same polymer material as the heat-sealable polymer layer (11) •
3. A paper cover for a food product package as defined in claim 1, c h a r a c t e r i z e d in that the inside polymer coat layers of the cover (3) are applied in the order as defined in claim 1.
4. A paper cover for a food product package as defined in claim 1, c h a r a c t e r i z e d in that the oxygen-barrier forming polymer layer (9) is of ethylvinyl alcohol polymer (EVOH) .
5. A paper cover for a food^product package as defined in claim 1, c h a r a c t e r i z e d in that the bonding component of the polymer coat is modified polyethene.
6. A paper cover for a food product package as defined in claim 1, c h a r a c t e r i z e d in that the oxygen-barrier forming polymer layer (9) is of polyethene terephtalate (PET) and at least one of the polymer bonding layers (8, 10) is of grafted polyethene.
7. A paper cover for a food product package as defined in claim 1, c h a r a c t e r i z e d in that the oxygen-barrier forming polymer layer (9) is of polyamide (PA) and at least one of the polymer bonding layers (8, 10) is of a copolymer of ethene and unsaturated carboxylic acid.
8. A paper cover for a food product package as defined in claim 1, c h a r a c t e r i z e d in that the heat- sealable polymer layer (11) contains, e.g., methacrylic acid and ethylvinyl acetate modified polyethene as an adhering compound and a copolymer of ethenemethacrylic acid as a releasing compound.
9. A paper cover for a ood product package as defined i-i any foregoing claim, c h a r a c t e r i z e d in that the outside (12) of the cover (3) is a conventional paper surface suitable for printing.
10. A method for producing the cover (3) for a food product package as defined in any foregoing claim, in which method several polymer coat layers (8...11) are applied simultaneously onto the base material of the paper cover, whereby the top layer (11) is of a heat- sealable and peelable polymer or blended polymer material, c h a r a c t e r i z e d in that the coat layers comprised of a polymer bonding layer (8) , an oxygen-barrier forming polymer layer (9) , another polymer bonding layer (10) and a heat-sealable polymer layer (11) are applied in molten state against each other and at the same time against a moving paper web (4) , and in that the paper coated thereby is used for fabricating said cover (3) by bringing the paper against the rim of a ready- filled food product container (2) and then adhering the cover by heat-sealing.
11. A method as defined in claim 10, c h a r a c ¬ t e r i z e d in that the polymer bonding layers (8, 10) are of a single polymer routed from a common melting container (17) .
PCT/FI1991/000277 1990-09-11 1991-09-11 Cover for food product package and method for producing said cover WO1992004187A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI904486A FI904486A (en) 1990-09-11 1990-09-11 LIVSMEDELSFOERPACKNING FOERSEDD MED ETT LOCK SAMT FOERFARANDE FOER FRAMSTAELLNING AV LOCKET FOER FOERPACKNINGEN.
FI904486 1990-09-11
FI914268A FI97285B (en) 1990-09-11 1991-09-10 Food packaging lid and method of making it
FI914268 1991-09-10

Publications (1)

Publication Number Publication Date
WO1992004187A1 true WO1992004187A1 (en) 1992-03-19

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ID=26158810

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1991/000277 WO1992004187A1 (en) 1990-09-11 1991-09-11 Cover for food product package and method for producing said cover

Country Status (3)

Country Link
AU (1) AU8419591A (en)
FI (1) FI97285B (en)
WO (1) WO1992004187A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0630745A1 (en) * 1993-06-21 1994-12-28 Enso-Gutzeit Oy Multi-layer product
WO1995010413A1 (en) * 1993-10-11 1995-04-20 Yhtyneet Paperitehtaat Oy Lid for a food can
EP0687557A3 (en) * 1994-06-16 1996-03-20 Enso Gutzeit Oy A cover for a product package and a method for producing the same
ES2097076A1 (en) * 1992-09-14 1997-03-16 Takeda Chemical Industries Ltd Thermosellable cover film. (Machine-translation by Google Translate, not legally binding)
WO1998030390A1 (en) * 1997-01-10 1998-07-16 Elopak Systems Ag A packaging laminate
WO2003033258A1 (en) * 2001-10-15 2003-04-24 Stora Enso Oyj Package lid, method for manufacturing the same and package sealed with the lid
WO2006007239A2 (en) 2004-06-17 2006-01-19 Stora Enso North America Corporation Multi-layer, high barrier packaging materials
DE102019129712A1 (en) * 2019-11-05 2021-05-06 Wihuri Packaging Oy Process for the production of multilayer packaging films, such packaging films and product packaging comprising them

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US4513036A (en) * 1983-10-17 1985-04-23 Champion International Corporation Barrier laminates for containment of essential oils and flavors and cartons made therefrom
EP0293098A2 (en) * 1987-05-29 1988-11-30 International Paper Company Improved non-foil composite structures for packaging juice
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DE3012342A1 (en) * 1980-03-29 1982-03-25 Scheuch Folien- und Papierverarbeitung GmbH & Co KG, 6109 Mühltal MULTILAYER FILM FOR THE LOCKING OF VESSELS
US4513036A (en) * 1983-10-17 1985-04-23 Champion International Corporation Barrier laminates for containment of essential oils and flavors and cartons made therefrom
EP0293098A2 (en) * 1987-05-29 1988-11-30 International Paper Company Improved non-foil composite structures for packaging juice
EP0333443A2 (en) * 1988-03-15 1989-09-20 W.R. Grace & Co.-Conn. Barrier stretch film

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2097076A1 (en) * 1992-09-14 1997-03-16 Takeda Chemical Industries Ltd Thermosellable cover film. (Machine-translation by Google Translate, not legally binding)
US5738933A (en) * 1993-06-21 1998-04-14 Enso-Gutzeit Oy Mutli-layer product
EP0630745A1 (en) * 1993-06-21 1994-12-28 Enso-Gutzeit Oy Multi-layer product
WO1995010413A1 (en) * 1993-10-11 1995-04-20 Yhtyneet Paperitehtaat Oy Lid for a food can
EP0687557A3 (en) * 1994-06-16 1996-03-20 Enso Gutzeit Oy A cover for a product package and a method for producing the same
US5840385A (en) * 1994-06-16 1998-11-24 Enso-Gutzeit Oy Cover for product package and method for producing same
WO1998030390A1 (en) * 1997-01-10 1998-07-16 Elopak Systems Ag A packaging laminate
AU2002333924B2 (en) * 2001-10-15 2007-08-09 Stora Enso Oyj Package lid, method for manufacturing the same and package sealed with the lid
WO2003033258A1 (en) * 2001-10-15 2003-04-24 Stora Enso Oyj Package lid, method for manufacturing the same and package sealed with the lid
NO337556B1 (en) * 2001-10-15 2016-05-09 Stora Enso Oyj Packaging lid, process for making it, method for making sealed packaging, as well as sealed packaging.
CN1308137C (en) * 2001-10-15 2007-04-04 斯塔诺阿埃索澳吉有限公司 Package lid, method for manufacturing the same and package sealed with the lid
WO2006007239A2 (en) 2004-06-17 2006-01-19 Stora Enso North America Corporation Multi-layer, high barrier packaging materials
EP1758738A4 (en) * 2004-06-17 2008-11-12 Stora Enso North America Corp Multi-layer, high barrier packaging materials
EP1758738A2 (en) * 2004-06-17 2007-03-07 Stora Enso North America Corporation Multi-layer, high barrier packaging materials
DE102019129712A1 (en) * 2019-11-05 2021-05-06 Wihuri Packaging Oy Process for the production of multilayer packaging films, such packaging films and product packaging comprising them
EP3819123A1 (en) 2019-11-05 2021-05-12 Wihuri Packaging OY Method for producing multilayer packaging films, packaging films of this type and product packages comprising the same

Also Published As

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AU8419591A (en) 1992-03-30
FI914268A0 (en) 1991-09-10
FI914268A (en) 1992-03-12
FI97285B (en) 1996-08-15

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