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WO1999061340A1 - Liquid packaging material - Google Patents

Liquid packaging material Download PDF

Info

Publication number
WO1999061340A1
WO1999061340A1 PCT/FI1999/000399 FI9900399W WO9961340A1 WO 1999061340 A1 WO1999061340 A1 WO 1999061340A1 FI 9900399 W FI9900399 W FI 9900399W WO 9961340 A1 WO9961340 A1 WO 9961340A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
packaging material
thermoplastic
hquid
base layer
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.)
Ceased
Application number
PCT/FI1999/000399
Other languages
French (fr)
Inventor
Hannu Kyykoski
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.)
UPM Kymmene Oy
Original Assignee
UPM Kymmene 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
Application filed by UPM Kymmene Oy filed Critical UPM Kymmene Oy
Publication of WO1999061340A1 publication Critical patent/WO1999061340A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • 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
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • 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
    • B32B2317/00—Animal or vegetable based
    • B32B2317/12—Paper, e.g. 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

Definitions

  • the object of the invention is Uquid packaging material comprising a base layer made of fibrous material, such as paper board, a barrier layer and one or more thermoplastic layers laminated onto the base layer in order to give the material the desired gas- and liquid barrier properties.
  • the fibrous base layer is laminated on one side with a barrier layer comprising thermoplastic layers or an alun inium layer, and on the other side with one or more thermoplastic layers.
  • a barrier layer comprising thermoplastic layers or an alun inium layer
  • thermoplastic layers or an alun inium layer
  • thermoplastic layers thermoplastic layers or an alun inium layer
  • thermoplastic layers thermoplastic layers or an alun inium layer
  • thermoplastic layers thermoplastic layers or an alun inium layer
  • the object of the present invention is to introduce a liquid packaging material that meets all the usual liquid- and gas barrier requirements set for liquid packaging materials, without the above-mentioned drawbacks.
  • a liquid packaging material according to the invention characterised in that the material on the outside of the base layer, i.e. the outermost material listed from the product to be packed in the material, contains at least one intermediate layer of thermoplastic, a paper layer and a lacquer layer or a layer of other equivalent material.
  • the surface of the material forming the outer surface is not a layer of plastic, but a paper layer covered with a lacquer layer, whereby the surfaces of hot tools do not get stained when coming into contact with the lacquer layer, and, therefore, do not need frequent cleaning.
  • the Hquid packaging material in accordance with the invention further comprises an ink layer which is located between the paper layer and the lacquer layer or a layer of equivalent material.
  • an ink layer which is located between the paper layer and the lacquer layer or a layer of equivalent material.
  • the base layer can be dimensioned in a somewhat unconventional manner due to the paper layer forming a part of the material. It is desirable that the fibrous base layer is paperboard material, the basis weight of the base layer being in the range of 160-200 g, preferably about 180 g.
  • thermoplastic on the top surface of the fibrous base layer is laminated at least one intermediate layer of thermoplastic, the basis weight of the intermediate layer of thermoplastic being in the range of 10-30 g, preferably about 15-20 g.
  • a paper layer onto the surface of the thermoplastic layer is laminated a paper layer, the basis weight of the paper layer being in the range of 50-80 g, preferably about 60-70 g.
  • the paperboard layer, the paper layer and the intermediate layer of thermoplastic between the two first- mentioned layers comprise a kind of sandwich-structure, which makes this hquid packaging material rigid but also suitably flexible for the kind of packages in which the material has to be bent quite vigorously, for example, in connection with seam structures.
  • Figure 1 shows a cross-section of the first exemplary embodiment of the Hquid packaging material in accordance with the invention
  • Figure 2 shows a cross-section of the second exemplary embodiment of the liquid packaging material in accordance with the invention.
  • FIG. 1 shows a cross-section of the first exemplary embodiment of the Hquid packaging material in accordance with the invention.
  • This Hquid packaging material comprises a barrier layer 4 formed by one or more thermoplastic layers and being in contact with the Hquid to be packed, hi the example described in Figure 1, the barrier layer 4 consists of three thermoplastic layers: a polythene layer 1 fo ⁇ rring the outer surface of the material, a barrier-thermoplastic layer 2, such as an EVOH layer, laminated onto the surface of polythene layer 1 and a polythene layer 3 formed on the other side of the EVOH layer 2. Thanks to this structure of layers the liquid packaging material has good barrier properties, i.e. gas- and Hquid tightness.
  • thermoplastic layers 1-3 comprising the barrier layer 4 are larninated onto the surface of a fibrous base layer 5, such as paperboard.
  • the basis weight of the base layer 5 may, for example, be in the range of 160-200 g, most preferably perhaps 180 g.
  • thermoplastic layer 6 Onto the other surface of paperboard base layer 5 is laminated at least one thermoplastic layer 6.
  • This layer can, for example, be of polythene, the basis weight of the thermoplastic layer being, for example, in the range of 10-30 g, most preferably perhaps 15-20 g. In this way paperboard layer 5 can be sealed tightly between the thermoplastic layers, whereby it is resistant to moisture and maintains good carrying properties.
  • An extremely crucial part of the Hquid packaging material in accordance with the invention consists of paper layer 7, which is laminated onto the surface of the thermoplastic intermediate layer 6.
  • This paper layer 7 together with base layer 5 and thermoplastic layer 6, between layers 5 and 7, form a so-caUed sandwich-structure, making this Hquid packaging material rigid and easy to handle.
  • the basis weight of paper layer 7 may, for example, be in the range of 50-80 g, most preferably perhaps 60-70 g.
  • paper layer 7 is further coated with an ink layer 8, which in turn is covered with a lacquer layer 9.
  • the lacquer layer together with the ink layer make the outer surface of the material sufficiently water-repeUent.
  • the above-described Hquid packaging material has an essential advantage in that its outer surface does not contain thermoplastic layers and, therefore, the outer surface can be handled with hot tools, without damaging the material itself or staining the hot tools, which would mean that the hot tools would have to be cleaned with disturbing frequency.
  • the reduced need for cleaning significantly improves the trouble-free operation and efficiency of the contamer-forrning machine.
  • Figure 2 shows a cross-section of the second exemplary embodiment of the liquid packaging material in accordance with the invention.
  • the embodiment of Figure 2 is an exact equivalent of Figure 1 as regards layers 5-9.
  • the embodiment of Figure 2 differs from the embodiment of Figure 1 only in that the barrier layer, which in the embodiment of Figure 1 consisted of three thermoplastic layers 1-3, now includes an aluminium layer 11 bonded to the base layer 5 by a glue layer 12.
  • the aluminium layer 11 is further coated with a thermoplastic layer 10, which is meant to be in contact with the product to be packed.

Landscapes

  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

The object of the invention is liquid packaging material comprising a base layer (5) of fibrous material, such as paperboard, a barrier layer (4) and one or more thermoplastic layers (6) laminated onto the base layer (5) in order to give the material the desired gas and liquid barrier properties. According to the invention, the material on the outside of the base layer (5) of fibrous material, i.e. the outermost material listing from the product to be packed in the material, includes at least one intermediate layer of thermoplastic (6), a paper layer (7) and a lacquer layer or a layer of other equivalent material (9).

Description

Liquid packaging material
Technical field
The object of the invention is Uquid packaging material comprising a base layer made of fibrous material, such as paper board, a barrier layer and one or more thermoplastic layers laminated onto the base layer in order to give the material the desired gas- and liquid barrier properties.
In a conventional liquid packaging material as described above, the fibrous base layer is laminated on one side with a barrier layer comprising thermoplastic layers or an alun inium layer, and on the other side with one or more thermoplastic layers. This kind of structure offers good liquid- and gas barrier properties, but there are certain drawbacks in handling the material. Namely, if this kind of material is used for making packages in which different mandrels and heat sealing tools have to be used in forming the body of the package, the jaws and holders of these tools, when heated to an adequate temperature in order to bring about a tight heat seal, come into contact with the surface layers of the liquid packaging material, consisting of plastic material. This means that the jaws, holders and equivalent parts are stained with molten plastic, causing disturbing stoppages for cleaning.
Summary of the invention
The object of the present invention is to introduce a liquid packaging material that meets all the usual liquid- and gas barrier requirements set for liquid packaging materials, without the above-mentioned drawbacks. This can be achieved by a liquid packaging material according to the invention, characterised in that the material on the outside of the base layer, i.e. the outermost material listed from the product to be packed in the material, contains at least one intermediate layer of thermoplastic, a paper layer and a lacquer layer or a layer of other equivalent material. In the hquid packaging material in accordance with the invention as described above a situation has been obtained in which the surface of the material forming the outer surface is not a layer of plastic, but a paper layer covered with a lacquer layer, whereby the surfaces of hot tools do not get stained when coming into contact with the lacquer layer, and, therefore, do not need frequent cleaning.
Advantageously, the Hquid packaging material in accordance with the invention further comprises an ink layer which is located between the paper layer and the lacquer layer or a layer of equivalent material. Naturally, one of the most essential qualities of the ink layer is to inform the user of the contents of the package, but it also contributes to the moisture repellence of the outer surface.
In a hquid packaging material in accordance with the invention, the base layer can be dimensioned in a somewhat unconventional manner due to the paper layer forming a part of the material. It is desirable that the fibrous base layer is paperboard material, the basis weight of the base layer being in the range of 160-200 g, preferably about 180 g.
In a material according to the invention, on the top surface of the fibrous base layer is laminated at least one intermediate layer of thermoplastic, the basis weight of the intermediate layer of thermoplastic being in the range of 10-30 g, preferably about 15-20 g. Correspondingly, onto the surface of the thermoplastic layer is laminated a paper layer, the basis weight of the paper layer being in the range of 50-80 g, preferably about 60-70 g.
In a hquid packaging material according to the invention, the paperboard layer, the paper layer and the intermediate layer of thermoplastic between the two first- mentioned layers comprise a kind of sandwich-structure, which makes this hquid packaging material rigid but also suitably flexible for the kind of packages in which the material has to be bent quite vigorously, for example, in connection with seam structures.
Description of drawings
The hquid packaging material in accordance with the invention is now described in greater detail by illustrating two exemplary embodiments with reference to the attached drawing, wherein
Figure 1 shows a cross-section of the first exemplary embodiment of the Hquid packaging material in accordance with the invention and
Figure 2 shows a cross-section of the second exemplary embodiment of the liquid packaging material in accordance with the invention.
Detailed description of the invention
Figure 1 shows a cross-section of the first exemplary embodiment of the Hquid packaging material in accordance with the invention. This Hquid packaging material comprises a barrier layer 4 formed by one or more thermoplastic layers and being in contact with the Hquid to be packed, hi the example described in Figure 1, the barrier layer 4 consists of three thermoplastic layers: a polythene layer 1 foπrring the outer surface of the material, a barrier-thermoplastic layer 2, such as an EVOH layer, laminated onto the surface of polythene layer 1 and a polythene layer 3 formed on the other side of the EVOH layer 2. Thanks to this structure of layers the liquid packaging material has good barrier properties, i.e. gas- and Hquid tightness.
Hi practice, the thermoplastic layers 1-3 comprising the barrier layer 4 are larninated onto the surface of a fibrous base layer 5, such as paperboard. The basis weight of the base layer 5 may, for example, be in the range of 160-200 g, most preferably perhaps 180 g.
Onto the other surface of paperboard base layer 5 is laminated at least one thermoplastic layer 6. This layer can, for example, be of polythene, the basis weight of the thermoplastic layer being, for example, in the range of 10-30 g, most preferably perhaps 15-20 g. In this way paperboard layer 5 can be sealed tightly between the thermoplastic layers, whereby it is resistant to moisture and maintains good carrying properties.
An extremely crucial part of the Hquid packaging material in accordance with the invention consists of paper layer 7, which is laminated onto the surface of the thermoplastic intermediate layer 6. This paper layer 7 together with base layer 5 and thermoplastic layer 6, between layers 5 and 7, form a so-caUed sandwich-structure, making this Hquid packaging material rigid and easy to handle. The basis weight of paper layer 7 may, for example, be in the range of 50-80 g, most preferably perhaps 60-70 g.
In order to obtain water-repeUence of the outer surface of the Hquid packaging material and to prevent rapid penetration of external humidity into the material, paper layer 7 is further coated with an ink layer 8, which in turn is covered with a lacquer layer 9. The lacquer layer together with the ink layer make the outer surface of the material sufficiently water-repeUent.
In practice, the above-described Hquid packaging material has an essential advantage in that its outer surface does not contain thermoplastic layers and, therefore, the outer surface can be handled with hot tools, without damaging the material itself or staining the hot tools, which would mean that the hot tools would have to be cleaned with disturbing frequency. The reduced need for cleaning significantly improves the trouble-free operation and efficiency of the contamer-forrning machine.
Figure 2 shows a cross-section of the second exemplary embodiment of the liquid packaging material in accordance with the invention. The embodiment of Figure 2 is an exact equivalent of Figure 1 as regards layers 5-9. The embodiment of Figure 2 differs from the embodiment of Figure 1 only in that the barrier layer, which in the embodiment of Figure 1 consisted of three thermoplastic layers 1-3, now includes an aluminium layer 11 bonded to the base layer 5 by a glue layer 12. The aluminium layer 11 is further coated with a thermoplastic layer 10, which is meant to be in contact with the product to be packed.
The Hquid packaging material in accordance with the invention has been described above only by way of two exemplary embodiments and it is to be understood that modifications can be made - especiaUy when it comes to the basis weights of different layers and the number, basis weights and materials of different thermoplastic layers - without deviating from the scope defined by the attached claims.

Claims

Claims
1. A Hquid packaging material, comprising a base layer (5) of fibrous material, such as paperboard, a barrier layer (4; 13) and one or more thermoplastic layers (6) laminated onto the base layer (5) in order to give the material the desired gas- and liquid tightness properties, characterised in that the material on the outside of the base layer (5) of fibrous material, i.e. the outermost material Hsting from the product to be packed in the material, comprises at least one intermediate layer (6) of thermoplastic a paper layer (7) and a lacquer layer or a layer of equivalent material (9).
2. A Hquid packaging material as claimed in Claim 1, characterised in that it further comprises an ink layer (8) located between the paper layer (7) and the lacquer layer or a layer of equivalent material (9).
3. A Hquid packaging material as claimed in Claim 1 or 2, characterised in that the fibrous base layer (5) is of paperboard, the basis weight of the base layer being in the range of 160-200 g, preferably about 180 g.
4. A Hquid packaging material as claimed in any one of the Claims 1-3, characterised in that between the main layer (5) and the paper layer (7) there is at least one intermediate layer of thermoplastic (6), the basis weight of the intermediate layer of thermoplastic being in the range of 10-30 g, preferably about 15-20 g.
5. A liquid packaging material as claimed in any one of the Claims 1-4, characterised in that the basis weight of the paper layer (7) is in the range of 50-80 g, preferably about 60-70 g.
PCT/FI1999/000399 1998-05-26 1999-05-12 Liquid packaging material Ceased WO1999061340A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI981167A FI981167L (en) 1998-05-26 1998-05-26 Liquid packaging material
FI981167 1998-05-26

Publications (1)

Publication Number Publication Date
WO1999061340A1 true WO1999061340A1 (en) 1999-12-02

Family

ID=8551809

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1999/000399 Ceased WO1999061340A1 (en) 1998-05-26 1999-05-12 Liquid packaging material

Country Status (2)

Country Link
FI (1) FI981167L (en)
WO (1) WO1999061340A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002022462A1 (en) * 2000-09-13 2002-03-21 Tetra Laval Holdings & Finance S A A packaging laminate for a retortable packaging carton

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2168312A (en) * 1984-12-13 1986-06-18 Metal Box Plc Easy-open containers
EP0313356A2 (en) * 1987-10-21 1989-04-26 Polycoat A/S A carton blank, especially for use in containers for food products, and laminate
WO1991010605A1 (en) * 1990-01-19 1991-07-25 Teich Aktiengesellschaft Flanged container with heat-sealed lid
WO1996011576A1 (en) * 1994-10-17 1996-04-25 Tielman, Bengt Paper material comprising a plurality of layers and intended for producing moulds for baking purposes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2168312A (en) * 1984-12-13 1986-06-18 Metal Box Plc Easy-open containers
EP0313356A2 (en) * 1987-10-21 1989-04-26 Polycoat A/S A carton blank, especially for use in containers for food products, and laminate
WO1991010605A1 (en) * 1990-01-19 1991-07-25 Teich Aktiengesellschaft Flanged container with heat-sealed lid
WO1996011576A1 (en) * 1994-10-17 1996-04-25 Tielman, Bengt Paper material comprising a plurality of layers and intended for producing moulds for baking purposes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002022462A1 (en) * 2000-09-13 2002-03-21 Tetra Laval Holdings & Finance S A A packaging laminate for a retortable packaging carton
US7514137B2 (en) 2000-09-13 2009-04-07 Tetra Laval Holdings & Finance S.A. Packaging laminate for a retortable packaging carton

Also Published As

Publication number Publication date
FI981167A7 (en) 1999-11-27
FI981167L (en) 1999-11-27
FI981167A0 (en) 1998-05-26

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