JP2015507582A - Packaging laminate for packaging containers and packaging containers formed from this packaging laminate - Google Patents

Abstract

The packaging laminate (10) for the retortable packaging container comprises a paper or paperboard layer (11) and a liquid-tight and heat-resistant outer plastic layer (12, 13) on both sides of the paper or paperboard layer (11). ). Between the paper or paperboard layer (11) and the outer plastic layer (13), the packaging laminate (10) has at least one additional layer (14) of material that has gas-tight properties. In order to improve the prior situation for providing a decorative laminate (18) of printing ink with good print quality to the packaging laminate (10), the paper or paperboard layer (11) is on one side, It has a printable coating (16) of pigment and sticker or adhesive and a starch coating (17) on the other side.

Description

  The present invention relates to a packaging laminate for a packaging container of the type formed from a flat and folded packaging blank made of a packaging laminate, comprising decorative artwork, the packaging blank first comprising: An open tubular container carton having a liquid-tight, substantially flat bottom closure that is sealed at one end by folding and heat-sealing the corresponding foldable end panel of the container carton Filled container carton by standing into a carton and then filling the container carton with the bottom with food, further folding and heat sealing the corresponding foldable end panel of the container carton The other end of the seal is sealed to form a liquid-tight, almost flat top closure. A paper or paperboard layer is provided, and one surface of the paper or paperboard layer is printed using a printable coating of pigment and an adhesive or adhesive in contact with the paper or paperboard layer and a suitable printing technique Printing ink decorative artwork applied directly onto the possible coating.

  The present invention also relates to a packaging container of a type that is subjected to a heat treatment that uses steam as a heat medium to extend the shelf life in a retort after filling and sealing operations, and the packaging container is made from a pre-made packaging laminate. Formed from a flat and folded packaging blank, the packaging blank being an open tubular container carton, one end sealed by folding and heat-sealing the corresponding foldable end panel of the container carton The container carton with the bottom is then erected to form a tubular container carton that forms a liquid tight and substantially flat bottom closure, and then the container carton with the bottom is filled with food and the corresponding foldable end panel of the container carton Furthermore, the other end of the container carton filled by folding and heat sealing is sealed, liquid-tight and almost flat top Is that to form the closures.

  Packaging laminates and packaging containers of the type described above are known, for example, from US Pat. This prior art packaging laminate has a rigid but foldable paper or paperboard layer and a liquid and heat resistant outer plastic layer on either side of the paper or paperboard layer. Prior art packaging laminates have at least one additional layer that is airtight to gases, particularly oxygen gas, between one of the paper or paperboard layers and the liquid-tight outer plastic layer. One preferred example of such a gas-tight material is an aluminum foil, or Alifoil, which is further referred to as so-called induction heat sealing (a quick, simple and efficient sealing technique). It has the advantage of being useful for the heat-sealing operation of packaging laminates by instruction thermosale.

  In general, the paper surface has a rough, uneven surface profile, which makes it difficult to print directly on the surface of paper or paperboard with sufficiently uniform print quality. To address such problems, the surface of the side of the paper or paperboard that is intended to be printed is provided with a printable coating of pigments and a sticking agent or adhesive, thereby roughing the paper or paperboard By sufficiently smoothing and smoothing the surface, it becomes possible to print with good print quality.

  Prior art types of packaging laminates are formed from a paper or paperboard web that has a printable coating on one surface of the pigment and an adhesive or adhesive that contacts the surface of the web. The web is unwound from the magazine reel and guided through a printing station, where the web consists of printing ink printed on its coated side onto a printable coating consisting of pigments and adhesives or adhesives. Provide the desired decorative artwork.

  A paper or paperboard web with decorative artwork is directed from the printing station to a lamination station where the other, ie, the uncoated side of the web, has gas laminated to the paper or paperboard web. On the other hand, a layer of a material having airtightness, for example, an aluminum foil or an alifoil is provided.

  The laminated web is directed from the lamination station to the final coating station, where the web is coated with an outer heat-resistant layer of plastic extruded on both sides of the web, after which the web is further processed and utilized. Rolled up for.

  From a flat folded tubular blank of a prior art packaging laminate, a final packaging container of the type described by the introduction is formed as follows. A flat folded blank is first erected into an open packaging carton, and one end (eg bottom end) is sealed by folding and heat-sealing the corresponding foldable bottom panel of the packaging carton. The The packaging carton with the bottom is filled with the relevant food, and then the corresponding foldable top panel of the packaging carton is further folded and the other end of the packaging carton (the top end in this example) is then sealed by a heat sealing process. Sealed. The package container thus filled and sealed is then ready to be subjected to a heat treatment that extends the shelf life in a retort that uses steam as the heating medium.

  Retortable packaging containers (one well-known commercial package sold under the name Tetra Recart) have many useful advantages, especially for consumers. They are mechanically rugged and structurally stable while being easy to open and convenient to use. They can also be easily compressed by simple crushing, for example when empty, but for traditional metal or plastic storage that only results in a flat sheet that saves minimal space Has advantages over cans.

  In the case of known packaging laminates, nonetheless, problems with non-uniform print quality are rarely associated with printing pigmented paper or paperboard webs. This type of problem can in many cases contribute to fiber dust, which is unconstrained exposed fiber surface of paper or paperboard web (ie, no pigment applied). In relation to the pigmented paper or paperboard web that is released from and wound onto the magazine reel, and moves to the pigmented surface. When the magazine reel is subsequently rewound for printing and conversion to the final packaging laminate, the discharged fiber dust is accompanied by a laminate that adheres to the pigment coating on the paper or paperboard web to the printing station. This prevents direct printing on the printable coating.

  Accordingly, there remains a need for improved packaging laminates that are free from the problems associated with the inevitable dust associated with the prior art.

International Application No. 2013/098026 Pamphlet

  Accordingly, one object of the present invention is to realize a packaging laminate of the type described in the introduction, which does not have the above-mentioned problems and drawbacks associated with prior art packaging laminates.

  Another object of the present invention is to realize a packaging container formed from a packaging laminate, the packaging container being filled and sealed, and then heat treatment to extend the shelf life in a retort that utilizes steam as a heating medium. Receive.

  According to one aspect of the present invention, to achieve a packaging laminate for a packaging container formed from a pre-made flat and folded packaging blank comprising decorative artwork and comprising a packaging laminate, In this packaging container, the packaging blank is first erected so as to be an open tubular container carton, which is folded at the corresponding foldable end panel of the container carton and heat sealed at one end. Sealed to form a liquid-tight, generally flat bottom closure, after which the container carton with the bottom is filled with food and the corresponding foldable end panel of the container carton is further folded and heat sealed. The other end of the filled container carton is sealed to form a liquid tight, almost flat top closure, The paper comprises a layer of paper or paperboard, and one side of the paper or paperboard layer is provided with a decorative artwork of printing ink that is applied directly onto the printable coating using suitable printing techniques. Having a printable coating of pigment or adhesive or sticker in contact with the paper or paperboard layer. The packaging laminate is characterized in that the other, ie the non-pigmented side of the paper or paperboard layer, has a starch coating in contact with the paper or paperboard layer.

  By providing a paper or paperboard web, one side is coated with a pigment as well as a printable coating of an adhesive or adhesive, and the other side of the paper or paperboard web, i.e., the non-pigmented side, is coated. Paper or paperboard webs that have an additional starch coating, and thus coated on both sides, are produced on a paper machine and then released to the risk of fiber dust being released and in later web printing operations. It can be taken up directly without the associated problems.

Coating of starch, can be extremely thin, actually 1 to 5 g / ^{m 2,} preferably from 3 g / ^{m 2.}

  According to one practical embodiment of the packaging laminate according to the invention, the printable coating on one side of the paper or paperboard layer is a combination of pigment and adhesive or fixing agent, as well as the rheological properties of the coating. Comprising at least one other substance capable of modifying. An example of such a printable coating is described and disclosed in US Pat.

  Examples of adhesives or adhesives that can be used for printable coatings are styrene butadiene latex, methyl methacrylate butadiene latex, polyacrylate latex, styrene acrylic latex, polyvinyl acetate, polyvinyl alcohol, polysaccharides, starch, proteins and their It is selected from the group that basically comprises the combination.

  Examples of materials that can be used to modify the viscosity of each of the coatings are proteins, polysaccharides, carboxymethylcellulose (CMC), hydroxyethylcellulose (HEC), alkali-soluble acrylic polymer emulsions (ASE), hydrophobically modified alkalis It is selected from the group comprising basically a soluble acrylic polymer (HASE), polyurethane (PU), polyvinyl alcohol (PVOH) and starch.

  Examples of pigments that can be used for both surface coatings listed above are selected from the group consisting essentially of layered silicate minerals, hydrated magnesium silicate, calcium carbonate, titanium dioxide and kaolin.

  According to one practical embodiment of the packaging material according to the invention, at least 50% of the pigment in the printable coating is calcium carbonate, while the fixing agent or adhesive, as well as the rheological modifications listed above. Both texture agents comprise acrylic copolymers.

In particular, the printable coating in the packaging material according to the invention is
An adhesive or sticking agent of styrene acrylic copolymer in an amount of 10-20% calculated on the weight of its composition;
An amount of layered silicate mineral clay and calcium carbonate pigment in an amount of 80-90%, calculated on the weight of the composition, and 0.1-1% calculated on the weight of the composition An amount of a substance capable of modifying the rheological properties of the coating ("rheological modifier"),
Can be contained.

The starch coating, as already mentioned, has a thickness or coating amount of less than 10 g / m ² , preferably approximately 5 g / m ² , and the printable coating is 15-20 g / m ² , preferably 20 g With a corresponding thickness or coating amount of / m ² .

  In order to protect moisture and liquid sensitive paper or paperboard layers from moisture and liquid penetration, the packaging laminate according to the invention has a liquid-tight outer plastic layer, which is further formed from the packaging laminate. The packaging container to be sealed should be sufficiently heat resistant to withstand the temperatures experienced when the closed packaging container is heat treated in the retort using steam as a heating medium with its filled contents . Examples of plastics that can be used for the outer heat resistant layer can be selected from the group consisting essentially of high density polyethylene, linear low density polyethylene, polypropylene and polyester.

  The packaging laminate according to the invention may be supplemented by at least one further layer of material which has an excellent gas tightness against gas, in particular against oxygen gas. Examples of materials having the desired gas tightness may be so-called barrier polymers, such as ethylene vinyl alcohol copolymers and polyamides. However, such layers are preferably composed of aluminum foil, alifoils, thereby allowing the packaging laminate to be heat sealed by so-called induction heat sealing, which is a quick and efficient sealing technique.

  According to another aspect of the present invention, a packaging container is provided that undergoes heat treatment under pressure with steam as a heat medium in the retort for the purpose of extending its shelf life after filling and heat sealing.

  The invention will now be described in more detail below with reference to the accompanying drawings.

It is a schematic sectional drawing of the packaging laminate by one Embodiment of this invention. 2 is a schematic diagram of a method of forming a packaging laminate illustrated by FIG. 1 is a perspective view of a packaging container formed by folding and heat-sealing a packaging laminate according to the present invention. FIG.

  FIG. 1 schematically shows a cross section of a packaging laminate according to a first embodiment of the invention. In the illustrated example, the packaging laminate 10 has a paper or paperboard layer 11 and liquid and heat resistant outer plastic layers 12 and 13 respectively on both sides of the paper or paperboard layer 11. Between the paper or paperboard layer 11 and one of the two liquid-tight outer plastic layers 13, the packaging laminate 10 further comprises a layer 14 of a material that is gas-tight, especially oxygen gas, Layer 14 is laminated to a paper or paperboard layer 11 with a lamination layer 15 interposed therebetween.

  As schematically shown in FIG. 1, a paper or paperboard layer 11 is printed on one side thereof with a pigment in contact with the surface of the underlying paper or paperboard layer 11 and an adhesive or an adhesive. It has a possible coating 16. As previously mentioned, the printable coating 16 also includes a material that can modify the rheological properties of the coating 16.

  It is further apparent from FIG. 1 that the paper or paperboard layer 11 has a starch coating 17 in contact with the paper or paperboard layer 11 on the other side.

  Examples of pigments that can be used for the printable coating 16 basically comprise layered silicate minerals, hydrated magnesium silicate, calcium carbonate, titanium dioxide and kaolin, as mentioned above. Selected from the group.

  Examples of adhesives or adhesives that can be used for the printable coating 16 are styrene butadiene latex, methyl methacrylate butadiene latex, polyacrylate latex, styrene acrylic latex, polyvinyl acetate, polyvinyl alcohol, polysaccharides, starch, protein and the like Are selected from the group basically comprising

  Examples of materials that can be used to modify the rheological properties of the printable coating 16 are proteins, polysaccharides, carboxymethylcellulose (CMC), hydroxyethylcellulose (HEC), alkali-soluble acrylic polymer emulsions (ASE). Selected from the group consisting essentially of hydrophobically modified alkali-soluble acrylic polymer (HASE), polyurethane (PU), polyvinyl alcohol (PVOH) and starch.

  In the illustrated embodiment of the packaging material 10 according to the invention, at least 50% of the pigment in the printable coating 16 is calcium carbonate, while modifying the adhesive or fixative, as well as the rheological properties of the coating. Both possible materials comprise acrylic copolymers.

The starch coating 17 has a thickness or coating amount of less than 10 g / m ² , preferably less than 5 g / m ² , for example 3 g / m ^2, as mentioned above, while a printable coating 16 has a corresponding thickness or coating amount of 15-30 g / m ² , preferably 20 g / m ² .

  In order not to hide the decorative artwork of printing ink printed on the printable coating 16 (shown schematically at reference numeral 18), the liquid-tight and heat-resistant outer plastic layer 12 of the packaging material 10 is It should be transparent so that the printed decorative artwork 18 can be clearly seen in the visual inspection of the decorated packaging laminate 10.

  Examples of transparent plastics that can be used for the liquid-tight and heat-resistant outer layer 12 are groups comprising mainly high density polyethylene (HDPE), linear low density polyethylene (LLDPE), polypropylene (PP) and polyester (PET). You can choose from.

  Examples of plastics that can be used for the liquid-tight and heat-resistant outer layer 13 may also be selected from the same group as the plastics listed for the liquid-tight and heat-resistant outer layer 12, i.e. high density polyethylene. (HDPE), linear low density polyethylene (LLDPE), polypropylene (PP) and polyester (PET).

  Examples of gas-tight materials for the layer 14 may be so-called barrier polymers, such as ethylene vinyl alcohol copolymers and polyamides. Preferably, however, the layer 14 is an aluminum foil, an alifoil, which allows the packaging laminate 10 to be heat sealed by so-called induction heat sealing, which is a quick, simple and efficient sealing technique.

  The packaging laminate illustrated in FIG. 1 is formed using, for example, the method schematically illustrated in FIG. As described in more detail in connection with FIGS. 1 and 2, a web of paper 20 coated on both sides with a pigment and a surface coating of adhesive or adhesive is unwound from a magazine reel 21. The paper web 20 is guided through a printing station at A, where the paper web 20 is directly applied to the surface of one of the two coatings mentioned above of the pigment and the adhesive or adhesive by a suitable printing technique. With the desired decorative artwork of the printing ink to be printed.

  The paper web 20 thus provided with decorative artwork is guided from the printing station A to the lamination station B via the bending rollers 22-25, where the aluminum foil 26 converges on the undecorated side of the paper web. And laminated with a lamination layer 27, which in conjunction with the web 20 and foil 26 being guided together through the nip between two lamination rollers 28. 26 is pushed out.

  The laminated paper web 20 is then further guided to the coating station C by the interposition of an additional bending roller 29, where the web 20 is guided to pass through the nip between the two coating rollers 32. The web 20 is coated with liquid-tight and heat-resistant coatings 30 and 31 that are extruded on both sides of the web 20.

  The laminated paper web 20 is then further guided to be wound from the coating station C onto a magazine reel 33 for further processing and use.

  As mentioned above, the packaging container can be formed from a packaging laminate according to the present invention which is of the type that is filled and sealed and then subjected to a heat treatment that extends the shelf life in the retort by steam as a heating medium. . An example of such a retortable packaging container is shown schematically in FIG. The illustrated packaging container 300 is a generally parallelepiped package of known packaging type, and is marketed under the trade name Tetra Report.

  The packaging container 300 is formed from a pre-made flat, folded packaging blank of packaging laminate, which is first erected to be an open tubular container carton. One end of the container carton is sealed by folding and heat-sealing the corresponding end panel of the container carton to form a liquid-tight, substantially flat bottom closure. In this way, the container carton with the bottom is filled with the relevant food, then the corresponding end panel of the container carton is further folded and the other end of the container carton filled by the sealing process is sealed, 3 is formed as a liquid-tight, substantially flat top closure 301.

DESCRIPTION OF SYMBOLS 10 Packaging laminate, packaging material 12, 13 Outer layer 14 Gas-tight material layer 15 Lamination layer 16 Printable coating 17 Starch coating 18 Decorative artwork 20 Paper web 21 Magazine reels 22, 23, 24, 25 Bending roller 26 Aluminum foil 27 Lamination layer 28 Lamination roller 29 Additional bending rollers 30, 31 Outer coating 32 Coating roller 33 Magazine reel 300 Packaging container 301 Top closure

Claims (7)

  A packaging laminate for a packaging container (300), said packaging container (300) comprising decorative artwork and formed from a pre-made flat and folded packaging blank of packaging laminate (10) The packaging blank is first erected so as to be an open tubular container carton, the container carton being folded at a corresponding foldable end panel of the container carton and end-sealed by heat sealing. Sealed to form a liquid-tight, substantially flat bottom closure, after which the container carton with the bottom is filled with food and further folding the corresponding foldable end panel of the container carton. The other end of the container carton filled in this way is sealed by heat sealing, a liquid-tight and substantially flat top closure 301), wherein the packaging laminate (10) comprises a paper or paperboard layer (11), one side of the paper or paperboard layer (11) being suitable on a printable coating (16) Having said printable coating (16) of pigment and adhesive or adhesive in contact with said paper or paperboard layer (11), with decorative artwork (18) of printing ink coated by printing techniques Packaging laminate, characterized in that the other side of the paper or paperboard layer (11) has a starch coating (17) in contact with the paper or paperboard layer (11). Coating of the starch (17) is less than 10 g / ^{m 2,} preferably packaging laminate according to claim 1, characterized in that less than 5 g / ^{m 2,} for example, a thickness or coating weight of 3 g / ^{m 2.}   Packaging laminate according to claim 1 or 2, characterized in that it has a liquid-tight and heat-resistant outer plastic layer (12, 13) on both sides of the paper or paperboard layer (11).   4. Packaging laminate according to claim 3, characterized in that the liquid-tight outer plastic layer (12, 13) is selected from the group comprising mainly high-density polyethylene, linear low-density polyethylene, polypropylene and polyester.   5. Packaging laminate according to any one of claims 1 to 4, characterized in that it has a layer (14) of a material that is gas-tight, in particular oxygen gas.   Packaging laminate according to claim 5, characterized in that the gas-tight layer (14) is an aluminum foil. 7. A parallelepiped packaging container of the type that is subjected to a heat treatment that, after filling and sealing, uses steam as a heating medium to extend the shelf life in the retort, and is described in any one of claims 1 to 6 In a parallelepiped packaging container (300) formed from a pre-made flat and folded packaging blank consisting of a packaging laminate (10),
The packaging blank is first erected to be an open tubular container carton, which is sealed at one end by folding and heat-sealing the corresponding foldable end panel of the container carton. Forming a liquid-tight, substantially flat bottom closure, and then filling the container carton with the bottom with food, further folding the corresponding foldable end panel of the container carton, A parallelepiped packaging container in which the other end of the container carton thus filled is sealed by sealing to form a liquid-tight, substantially flat top closure (301).

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