WO2000035674A1 - Paperboard-based material - Google Patents

Paperboard-based material Download PDF

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Publication number
WO2000035674A1
WO2000035674A1 PCT/FI1999/001032 FI9901032W WO0035674A1 WO 2000035674 A1 WO2000035674 A1 WO 2000035674A1 FI 9901032 W FI9901032 W FI 9901032W WO 0035674 A1 WO0035674 A1 WO 0035674A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
dry
paperboard
attached
core layer
Prior art date
Application number
PCT/FI1999/001032
Other languages
French (fr)
Inventor
Tapio Niemi
Tapani Penttinen
Kimmo Nevalainen
Seppo Kiiski
Original Assignee
Stora Enso Oyj
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 Stora Enso Oyj filed Critical Stora Enso Oyj
Priority to CA002355126A priority Critical patent/CA2355126A1/en
Priority to AU17821/00A priority patent/AU1782100A/en
Priority to EP99961083A priority patent/EP1150838A1/en
Priority to JP2000587963A priority patent/JP2002532286A/en
Publication of WO2000035674A1 publication Critical patent/WO2000035674A1/en
Priority to US09/879,950 priority patent/US20020060006A1/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
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/02—Layered products comprising a layer of paper or cardboard next to a fibrous or filamentary layer
    • 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
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/42—Multi-ply comprising dry-laid paper
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/02—Open containers

Definitions

  • the invention relates to a paperboard-based material used particularly for producing cups, bowls, plates and the like, the material comprising a core layer which is liquid-proof at least for a short period of time and consists of at least one paperboard layer and at least one other material layer.
  • the material described above is typically used for producing various dishes intended for liquids, such as cups and bowls, the material comprising a paperboard layer and a layer attached thereto which is liquid proof at least for a short period of time.
  • Such materials are not as liquid proof as proper liquid packaging boards which can be used for storing liquids even for long periods and which comprise several plastic layers and barrier layers to ensure that they are liquid and gas proof.
  • the object of the present invention is to provide a paperboard- based material which is used particularly for producing dishes, such as cups, bowls, plates and the like, and the outer surface of which does not heat up to a dangerous extent even when the dish is filled with hot liquid or food or when these are heated up in a microwave oven.
  • the paperboard-based material of the invention which is characterized in that, in addition to the core layer, the material comprises a dry-formed material layer attached to one surface of the core layer.
  • this dry-formed material layer contains at least 50% of cellulose fibre and is bound with a binder.
  • This dry- formed material layer can be attached to the core layer surface either by ex- trusion lamination or dispersion lamination.
  • the material layer providing short-term liquid impermeability is made of synthetic polymer and/or biopolymer.
  • biopolymer also called bioplastic
  • the dish will also be well- suited for recycling and may even be a biodegradable, i.e. com- postable, product.
  • One surface of the paperboard material according to the invention consists of a dry-formed material layer which is porous and contains rather a lot of air. Thus heat transmission does not cause the outer surface of the material to heat up to a dangerous extent even when the dish made of it is filled with hot liquid or food or these are heated in the dish in a microwave oven.
  • the figure shows a cross-section of a preferred embodiment of the paperboard-based material according to the invention.
  • the cross-section comprises a paperboard layer 2 and a material layer attached to one surface thereof, e.g. a layer 3 of synthetic polymer and/or biopolymer which renders the core layer 1 formed by the paperboard layer 2 and layer 3 liquid proof at least for a short period of time.
  • the paperboard layer 2 may consist of pure solid board the basis weight of which may be e.g. 210 g/m 2 .
  • Layer 3 may consist of LPDE the basis weight of which may be e.g. 10 to 30 g/m 2 .
  • the structure of the core layer 1 corresponds to the structure of the conventional paperboard-based material used for producing dishes.
  • a dry-formed material layer 4 is attached to one surface of the core layer 1.
  • this dry-formed material layer contains at least 50% of cellulose fibre and is bound with a binder.
  • cellulose fibres are spread evenly onto a moving wire on which the material is formed by means of air flow.
  • dry-forming it is possible to use very different fibres which are spread onto the wire by means of one or more formers.
  • the material of the invention primarily contains cellulose fibres and secondarily artificial fibres, such as plastic fibres or the like, depending on the desired properties of the material.
  • the binding agents bind the material layer on the wire so that it forms a uniform web.
  • Such a dry- formed material layer is relatively porous, thus containing rather a lot of air.
  • the thickness of the dry-formed material layer 4 used may be e.g. 0.3 to 2 mm and the basis weight 30 to 100 g/m 2 .
  • This material layer 5 may be e.g. a layer of synthetic polymer and/or biopolymer formed by extrusion lamination. It may be made of LPDE the basis weight of which is e.g. 10 to 30 g/m 2 . Layer 5 may also be a material layer which is spread or sprayed onto the surface of the core layer 1 and by means of which the dry-formed layer 4 is attached to the core layer 1. This procedure is called dispersion lamination.
  • the dry-formed layer 4 can also be attached in a manner which differs from the dispersion and extrusion lamination procedures described above.
  • the surface layer of the dry-formed material layer con- tains, at least on the side to be attached to the core layer 1 , adhesive latex by means of which the core layer and the dry-formed layer can be attached to each other.
  • adhesive latex by means of which the core layer and the dry-formed layer can be attached to each other.
  • the core layer 1 and the dry-formed layer 4 can be directly attached to each other.
  • Other materials could also be used at least on the surface of the dry- formed material layer to be attached to the core layer 1 to attach these layers together.
  • the paperboard-based material according to the invention has been described above only by means of some preferred embodiments and it is to be understood that the detailed structure as well as the layer or layers providing liquid impermeability, the paperboard-based layer and the dry-formed layer can be modified without deviating from the scope of protection defined in the appended claims.
  • the detailed structure and basis weight of the paperboard layer may also differ.
  • the fibre content of the dry-formed layer and the way of binding it may vary as well as the way in which it is attached to the core layer.
  • One significant property of the paperboard-based material of the invention is that, if desired, it can be provided with a composition which is suitable for recycling, i.e.
  • the invention can be modified considerably without affecting the implementation of the inventive concept, i.e. the fact that by arranging a relatively porous dry-formed material layer as the outer layer of the material from which a dish is to be formed the surface of the dish can be prevented from heating up when there is hot food or liquid next to the surface opposite to the material.

Abstract

The invention relates to a paperboard-based material used particularly for producing dishes, such as cups, bowls, plates or the like, the material comprising a core layer (1) which is liquid proof at least for a short period of time and is formed of at least one paperboard layer (2) and at least one other material layer (3). According to the invention, the material also comprises a dry-formed material layer (4) attached to one surface of the core layer (1).

Description

PAPERBOARD-BASED MATERIAL
BACKGROUND OF THE INVENTION
The invention relates to a paperboard-based material used particularly for producing cups, bowls, plates and the like, the material comprising a core layer which is liquid-proof at least for a short period of time and consists of at least one paperboard layer and at least one other material layer.
The material described above is typically used for producing various dishes intended for liquids, such as cups and bowls, the material comprising a paperboard layer and a layer attached thereto which is liquid proof at least for a short period of time. Such materials are not as liquid proof as proper liquid packaging boards which can be used for storing liquids even for long periods and which comprise several plastic layers and barrier layers to ensure that they are liquid and gas proof.
When dishes are produced from paperboard-based material, spe- cial structural solutions are needed to make the dishes suitable for hot liquids, too. For example, a coffee cup needs to be provided with ears which allow to handle the cup containing hot coffee safely. Such special structural solutions cannot, however, be applied to other kinds of dish, such as plates, bowls or the like. Thus the outer surface of a dish containing food or liquid heats up considerably when food or liquid is heated in a microwave oven, for example. In that case microwaves do not heat up the material of the dish itself, but heating results from heat transmission from the food or liquid. The outer surface of such a dish may be so hot after heating in the microwave oven that it cannot be handled safely with bare hands.
BRIEF DESCRIPTION OF THE INVENTION
The object of the present invention is to provide a paperboard- based material which is used particularly for producing dishes, such as cups, bowls, plates and the like, and the outer surface of which does not heat up to a dangerous extent even when the dish is filled with hot liquid or food or when these are heated up in a microwave oven. This is achieved with the paperboard-based material of the invention which is characterized in that, in addition to the core layer, the material comprises a dry-formed material layer attached to one surface of the core layer. Preferably this dry-formed material layer contains at least 50% of cellulose fibre and is bound with a binder. This dry- formed material layer can be attached to the core layer surface either by ex- trusion lamination or dispersion lamination. Usually the material layer providing short-term liquid impermeability is made of synthetic polymer and/or biopolymer. Particularly when biopolymer, also called bioplastic, is used, the dish will also be well- suited for recycling and may even be a biodegradable, i.e. com- postable, product.
One surface of the paperboard material according to the invention consists of a dry-formed material layer which is porous and contains rather a lot of air. Thus heat transmission does not cause the outer surface of the material to heat up to a dangerous extent even when the dish made of it is filled with hot liquid or food or these are heated in the dish in a microwave oven.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, the paperboard-based material of the invention will be described in greater detail with reference to the accompanying drawing, in which the figure shows a cross-section of a preferred embodiment of the mate- rial according to the invention.
DETAILED DESCRIPTION OF THE INVENTION
The figure shows a cross-section of a preferred embodiment of the paperboard-based material according to the invention. The cross-section comprises a paperboard layer 2 and a material layer attached to one surface thereof, e.g. a layer 3 of synthetic polymer and/or biopolymer which renders the core layer 1 formed by the paperboard layer 2 and layer 3 liquid proof at least for a short period of time. The paperboard layer 2 may consist of pure solid board the basis weight of which may be e.g. 210 g/m2. Layer 3 may consist of LPDE the basis weight of which may be e.g. 10 to 30 g/m2. In principle, the structure of the core layer 1 corresponds to the structure of the conventional paperboard-based material used for producing dishes.
According to the invention, a dry-formed material layer 4 is attached to one surface of the core layer 1. Most preferably this dry-formed material layer contains at least 50% of cellulose fibre and is bound with a binder. As is well known, in dry-forming fibres are spread evenly onto a moving wire on which the material is formed by means of air flow. In dry-forming it is possible to use very different fibres which are spread onto the wire by means of one or more formers. The material of the invention, however, primarily contains cellulose fibres and secondarily artificial fibres, such as plastic fibres or the like, depending on the desired properties of the material. In dry-forming either binder fibres are scattered into the material or binder is sprayed into the material on the wire, and in the following heat treatment step the binding agents bind the material layer on the wire so that it forms a uniform web. Such a dry- formed material layer is relatively porous, thus containing rather a lot of air. In the paperboard-based material of the invention the thickness of the dry-formed material layer 4 used may be e.g. 0.3 to 2 mm and the basis weight 30 to 100 g/m2.
As appears from the figure, between the core layer 1 and the dry- formed layer 4 there is a material layer 5 by means of which the dry-formed layer 4 and the core layer 1 are attached to each other. This material layer 5 may be e.g. a layer of synthetic polymer and/or biopolymer formed by extrusion lamination. It may be made of LPDE the basis weight of which is e.g. 10 to 30 g/m2. Layer 5 may also be a material layer which is spread or sprayed onto the surface of the core layer 1 and by means of which the dry-formed layer 4 is attached to the core layer 1. This procedure is called dispersion lamination.
The dry-formed layer 4 can also be attached in a manner which differs from the dispersion and extrusion lamination procedures described above. In this method the surface layer of the dry-formed material layer con- tains, at least on the side to be attached to the core layer 1 , adhesive latex by means of which the core layer and the dry-formed layer can be attached to each other. In that case there is no need for a separate material layer 5, but the core layer 1 and the dry-formed layer 4 can be directly attached to each other. Other materials could also be used at least on the surface of the dry- formed material layer to be attached to the core layer 1 to attach these layers together.
The paperboard-based material according to the invention has been described above only by means of some preferred embodiments and it is to be understood that the detailed structure as well as the layer or layers providing liquid impermeability, the paperboard-based layer and the dry-formed layer can be modified without deviating from the scope of protection defined in the appended claims. Thus there may be one or more layers providing liquid impermeability and their material composition may vary according to the desired properties. The detailed composition and basis weight of the paperboard layer may also differ. Furthermore, the fibre content of the dry-formed layer and the way of binding it may vary as well as the way in which it is attached to the core layer. One significant property of the paperboard-based material of the invention is that, if desired, it can be provided with a composition which is suitable for recycling, i.e. of pulpable quality. Thus the invention can be modified considerably without affecting the implementation of the inventive concept, i.e. the fact that by arranging a relatively porous dry-formed material layer as the outer layer of the material from which a dish is to be formed the surface of the dish can be prevented from heating up when there is hot food or liquid next to the surface opposite to the material.

Claims

1. A paperboard-based material used particularly for producing dishes, such as cups, bowls, plates or the like, the material comprising a core layer (1 ) which is liquid proof at least for a short period of time and is formed of at least one paperboard layer (2) and at least one other material layer (3), characterized in that the material also comprises a dry-formed material layer (4) attached to one surface of the core layer (1 ).
2. A material according to claim 1, characterized in that said at least one other material layer (3) is a layer of synthetic polymer and/or biopolymer.
3. A material according to claim 1 or 2, characterized in that the dry-formed material layer (4) is a layer containing at least 50% of cellulose fibre and bound with a binder.
4. Material according to any one of claims 1 to 3, character- i z e d in that the dry-formed material layer (4) contains, at least in the surface layer to be attached to the core layer (1), adhesive latex used for attaching the dry-formed material layer (4) and the core layer (1) to each other.
5. A material according to any one of claims 1 to 3, characterized in that the dry-formed material layer (4) and the core layer (1 ) are attached to each other by extrusion lamination (5).
6. A material according to any one of claims 1 to 3, characterized in that the dry-formed material layer and the core layer are attached to each other by dispersion lamination.
PCT/FI1999/001032 1998-12-14 1999-12-14 Paperboard-based material WO2000035674A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA002355126A CA2355126A1 (en) 1998-12-14 1999-12-14 Paperboard-based material
AU17821/00A AU1782100A (en) 1998-12-14 1999-12-14 Paperboard-based material
EP99961083A EP1150838A1 (en) 1998-12-14 1999-12-14 Paperboard-based material
JP2000587963A JP2002532286A (en) 1998-12-14 1999-12-14 Paperboard-based material
US09/879,950 US20020060006A1 (en) 1998-12-14 2001-06-14 Paperboard-based Material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI982702A FI106940B (en) 1998-12-14 1998-12-14 Cardboard-based material
FI982702 1998-12-14

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/879,950 Continuation US20020060006A1 (en) 1998-12-14 2001-06-14 Paperboard-based Material

Publications (1)

Publication Number Publication Date
WO2000035674A1 true WO2000035674A1 (en) 2000-06-22

Family

ID=8553108

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1999/001032 WO2000035674A1 (en) 1998-12-14 1999-12-14 Paperboard-based material

Country Status (7)

Country Link
US (1) US20020060006A1 (en)
EP (1) EP1150838A1 (en)
JP (1) JP2002532286A (en)
AU (1) AU1782100A (en)
CA (1) CA2355126A1 (en)
FI (1) FI106940B (en)
WO (1) WO2000035674A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3954554A (en) * 1972-09-09 1976-05-04 Karl Kroyer St. Anne's Limited Multi-ply paper and paperboard having a wet-laid ply and a dry-laid ply
DE2945977A1 (en) * 1979-11-12 1981-05-21 Lignotock Verfahrenstechnik Gmbh, 1000 Berlin Bonded cellulose and or lignocellulose fibre mat prodn. - by dry-pressing between two corrugated carrier layers
EP0251445A2 (en) * 1986-06-25 1988-01-07 International Paper Company Package for microwave cooking with controlled thermal effects
SE504226C2 (en) * 1995-04-24 1996-12-09 Tetra Laval Holdings & Finance Packaging laminate and packaging made therefrom
EP0796731A2 (en) * 1996-03-11 1997-09-24 SA-Patent AG Recyclable and biodegradable, heat- and cold-resistant laminate, preferably for food packaging
WO1999020839A1 (en) * 1997-10-22 1999-04-29 Walkisoft Finland Oy Corrugated cardboard formed by dry laying

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3954554A (en) * 1972-09-09 1976-05-04 Karl Kroyer St. Anne's Limited Multi-ply paper and paperboard having a wet-laid ply and a dry-laid ply
DE2945977A1 (en) * 1979-11-12 1981-05-21 Lignotock Verfahrenstechnik Gmbh, 1000 Berlin Bonded cellulose and or lignocellulose fibre mat prodn. - by dry-pressing between two corrugated carrier layers
EP0251445A2 (en) * 1986-06-25 1988-01-07 International Paper Company Package for microwave cooking with controlled thermal effects
SE504226C2 (en) * 1995-04-24 1996-12-09 Tetra Laval Holdings & Finance Packaging laminate and packaging made therefrom
EP0796731A2 (en) * 1996-03-11 1997-09-24 SA-Patent AG Recyclable and biodegradable, heat- and cold-resistant laminate, preferably for food packaging
WO1999020839A1 (en) * 1997-10-22 1999-04-29 Walkisoft Finland Oy Corrugated cardboard formed by dry laying

Also Published As

Publication number Publication date
US20020060006A1 (en) 2002-05-23
FI982702A0 (en) 1998-12-14
JP2002532286A (en) 2002-10-02
CA2355126A1 (en) 2000-06-22
FI982702A (en) 2000-06-15
EP1150838A1 (en) 2001-11-07
AU1782100A (en) 2000-07-03
FI106940B (en) 2001-05-15

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