CA1251718A - Laminated paper board for gable top containers - Google Patents
Laminated paper board for gable top containersInfo
- Publication number
- CA1251718A CA1251718A CA000461352A CA461352A CA1251718A CA 1251718 A CA1251718 A CA 1251718A CA 000461352 A CA000461352 A CA 000461352A CA 461352 A CA461352 A CA 461352A CA 1251718 A CA1251718 A CA 1251718A
- Authority
- CA
- Canada
- Prior art keywords
- central layer
- paper board
- pulp
- surface layers
- board according
- 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.)
- Expired
Links
- 239000011087 paperboard Substances 0.000 title claims abstract description 15
- 239000010410 layer Substances 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000002344 surface layer Substances 0.000 claims abstract description 20
- 235000021056 liquid food Nutrition 0.000 claims abstract description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 18
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 9
- 229920001131 Pulp (paper) Polymers 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 4
- 235000008124 Picea excelsa Nutrition 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 241000218657 Picea Species 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 241000218631 Coniferophyta Species 0.000 description 1
- 244000193463 Picea excelsa Species 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard 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
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/022—Mechanical 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
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/06—Layered products comprising a layer of paper or cardboard specially treated, e.g. surfaced, parchmentised
-
- 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
- B32B2439/00—Containers; Receptacles
- B32B2439/40—Closed containers
- B32B2439/62—Boxes, cartons, cases
Abstract
ABSTRACT
The invention relates to a laminated paper board which is very stiff and lends itself well to creasing and which does not impart undesired smell or taste to liquid foods, consisting of at least three layers.
According to the invention the board material consists of at least one central layer of cellulosic material of high bulk, i.e. low density, and on each side of the central layer/s surface layers of higher strength and ductility than the central layer/s, the primary purpose of the central layer/s being to keep the surface layers apart, thus providing the laminated paper board with a combination of properties which is desirable, especially for Gable Top containers.
The invention relates to a laminated paper board which is very stiff and lends itself well to creasing and which does not impart undesired smell or taste to liquid foods, consisting of at least three layers.
According to the invention the board material consists of at least one central layer of cellulosic material of high bulk, i.e. low density, and on each side of the central layer/s surface layers of higher strength and ductility than the central layer/s, the primary purpose of the central layer/s being to keep the surface layers apart, thus providing the laminated paper board with a combination of properties which is desirable, especially for Gable Top containers.
Description
'" ~L25~7~18 LAMINATED BOARD MATERIAL
TECHNICAL SCOPE
The invention relates to a laminated board material which is very stiff and lends itself well to increasing and which does not impart unwanted smell or taste to liquid foods, being a laminate of at least three layers. More specifically the invention relates to a laminated paper board to be used for containers for liquids, especially so called Gable Top containers. Those containers which are marketed as TETRA RE ~ and PURE PA ~ are examples of Gable Top containers.
BACKGROVND ART
Paper board containers for liquids are presently manufactured mainly from bleached sulphate pulp. This material is very suitable for containers but is expensive, due to the great expense of raw material which is required. Containers for other products than liquids are often made from composite materials, the stiffness of which has been increased by laminating, corrugating, or otherwise, and in some instances these principles have been employed also in the production of containers for liquids. These types of materials have not been used for Gable Top containers, however, since they do not have the necessary qualities therefor. Laminated board materials are also known, e.g. for folding board, where a central layer of groundwood pulp and/or thermo-mechanical pulp (TMP) is covered by surface layers of bleached chemical pulp. These materi-als cannot either be accepted for use with liquid foods, however, especially not for milk, mineral water and the like.
;25~7~8 la 26927-36 DISCLOSURE OF THE INV:E~NTION
The purpose of the invention is to offer a laminated board material which is as good a material for containers as is homogene-ous fully bleached board but which makes more efficient use of the wood fibre. In particular the invention aims at providing a lamin-ated board material for so called Gable Top containers, which demand a material ~' lzs~7l8 26927-36 with good creasability, flat surfaces and no taste or smell.
These and other objectives may be achieved by providing the material with at least one centre layer of a cellulosic material of large bulk, i.e. of low density, which has also good creasability and foldability, and on each side of the centre layer/s surface layers of cellulosic material of considerably greater material strength than the centre layer/s. The primary purpose of the centre layer/s is to keep the surface layers apart, providing the laminated board with such properties as are desirable in particular for Gable Top containers.
Accordingly, in one aspect, the invention provides a laminated paper board which is stiff and creasable and which does not impart undesirable smell or taste to liquid foods, consisting of at least three layers, characterized by having at least one central layer of cellulosic material of high bulk, and a density of between 500 and 700 kg/m3 comprising a mixture consisting mainly of chemically modified thermo-mechanical pulp (CTMP) and bleached long fibre sulphate pulp, and on eachSide of said at least one central layer surface layers of cellulosic material of higher strength and ductility than the at least one central layer and a density of between 640 and 750 kg/m , the primary purpose of the at least one central layer being to keep the surface layers apart.
The centre layer/s is/are made from a mixture mainly of chemically modified thermo-mechanical pulp, so called CTMP, and bleached sulphate pulp. The surface layers should be made from ~?
~, ~ 25 17 ~ 8 26927-36 - 2a -bleached sulphate pulp, preferably from sulphate pulp with long fibres. Long fibre sulphate pulp signifies pulp from soft wood with a mean fibre length of at least 2 mm.
The density of the centre layer/s should be between 550 and 700 kg/m3, preferably between 575 and 675 kg/m3, while that of the surface layers should be between 64n and 750 kg/m3, preferably between 660 and 720 kg/m3. Further, the centre layer/s should contain between 30 and 70, preferably between 40 and 60, % per weight CTMP, the rest mainly being bleached long fibre sulphate pulp. In order to obtain the best possible product properties, for example to keep the board from splitting, the pulp of the centre layer/s should consist at least in part of pulp which has been further refined compared to the sulphate pulp of the surface layers, which part will function as reinforcement for the pulp of the board. More specifically, it is suitable that this reinforcing fraction constitute 5 - 20 % of the total mass of the centre layer/s and be refined to a drainage resistance of at O O
least 60 SR, preferably to 70 - 80 SR, while the sulphate pulp of the surface layers should be refined to between 20 and 30 SR, preferably 22 - 28 SR.
The different types of pulp constituting the different layers also contain glue, starch, and retention agents of types and quantities ~L2s~71~;
as are well known in the art The total grammage of the material may vary between 200 and 400 g/m .
Further aspects and characteristics of the invention will be apparent from the patent claims and from the following description of a pre-ferred embodiment.
DESCRIPTION OF A PREFERRED EMBODIMENT
The laminated paper board according to the preferred embodiments was 10 manufactured with grammages of 255 and 310 g/m . In both cases one of the surface layers (the exterior layer) had a grammage of 70 g/m and the other (the interior layer) a grammage of 50 g/m . The surface layers consisted of bleached long fibre sulphate pulp refined to 24 SR (desired value) and with a density of approximately 690 kg/m (mean value). The centre layer consisted of about 45 % CTMP and 55 %
bleached long fibre sulphate pulp, the raw material of which was a mixture of wood from Nordic conifers (Pinus silvestris and Picea abies). The centre layer contained about 10 % (of the total mass of the centre layer) reinforcing pulp, refined to 75 SR (desired value).
The density of the centre layer was about 625 kg/m (mean value). The mean value of the drainage resistance of the centre layer was 30SR
(desired value). The raw material for the CTMP was wood from Picea abies.
TECHNICAL SCOPE
The invention relates to a laminated board material which is very stiff and lends itself well to increasing and which does not impart unwanted smell or taste to liquid foods, being a laminate of at least three layers. More specifically the invention relates to a laminated paper board to be used for containers for liquids, especially so called Gable Top containers. Those containers which are marketed as TETRA RE ~ and PURE PA ~ are examples of Gable Top containers.
BACKGROVND ART
Paper board containers for liquids are presently manufactured mainly from bleached sulphate pulp. This material is very suitable for containers but is expensive, due to the great expense of raw material which is required. Containers for other products than liquids are often made from composite materials, the stiffness of which has been increased by laminating, corrugating, or otherwise, and in some instances these principles have been employed also in the production of containers for liquids. These types of materials have not been used for Gable Top containers, however, since they do not have the necessary qualities therefor. Laminated board materials are also known, e.g. for folding board, where a central layer of groundwood pulp and/or thermo-mechanical pulp (TMP) is covered by surface layers of bleached chemical pulp. These materi-als cannot either be accepted for use with liquid foods, however, especially not for milk, mineral water and the like.
;25~7~8 la 26927-36 DISCLOSURE OF THE INV:E~NTION
The purpose of the invention is to offer a laminated board material which is as good a material for containers as is homogene-ous fully bleached board but which makes more efficient use of the wood fibre. In particular the invention aims at providing a lamin-ated board material for so called Gable Top containers, which demand a material ~' lzs~7l8 26927-36 with good creasability, flat surfaces and no taste or smell.
These and other objectives may be achieved by providing the material with at least one centre layer of a cellulosic material of large bulk, i.e. of low density, which has also good creasability and foldability, and on each side of the centre layer/s surface layers of cellulosic material of considerably greater material strength than the centre layer/s. The primary purpose of the centre layer/s is to keep the surface layers apart, providing the laminated board with such properties as are desirable in particular for Gable Top containers.
Accordingly, in one aspect, the invention provides a laminated paper board which is stiff and creasable and which does not impart undesirable smell or taste to liquid foods, consisting of at least three layers, characterized by having at least one central layer of cellulosic material of high bulk, and a density of between 500 and 700 kg/m3 comprising a mixture consisting mainly of chemically modified thermo-mechanical pulp (CTMP) and bleached long fibre sulphate pulp, and on eachSide of said at least one central layer surface layers of cellulosic material of higher strength and ductility than the at least one central layer and a density of between 640 and 750 kg/m , the primary purpose of the at least one central layer being to keep the surface layers apart.
The centre layer/s is/are made from a mixture mainly of chemically modified thermo-mechanical pulp, so called CTMP, and bleached sulphate pulp. The surface layers should be made from ~?
~, ~ 25 17 ~ 8 26927-36 - 2a -bleached sulphate pulp, preferably from sulphate pulp with long fibres. Long fibre sulphate pulp signifies pulp from soft wood with a mean fibre length of at least 2 mm.
The density of the centre layer/s should be between 550 and 700 kg/m3, preferably between 575 and 675 kg/m3, while that of the surface layers should be between 64n and 750 kg/m3, preferably between 660 and 720 kg/m3. Further, the centre layer/s should contain between 30 and 70, preferably between 40 and 60, % per weight CTMP, the rest mainly being bleached long fibre sulphate pulp. In order to obtain the best possible product properties, for example to keep the board from splitting, the pulp of the centre layer/s should consist at least in part of pulp which has been further refined compared to the sulphate pulp of the surface layers, which part will function as reinforcement for the pulp of the board. More specifically, it is suitable that this reinforcing fraction constitute 5 - 20 % of the total mass of the centre layer/s and be refined to a drainage resistance of at O O
least 60 SR, preferably to 70 - 80 SR, while the sulphate pulp of the surface layers should be refined to between 20 and 30 SR, preferably 22 - 28 SR.
The different types of pulp constituting the different layers also contain glue, starch, and retention agents of types and quantities ~L2s~71~;
as are well known in the art The total grammage of the material may vary between 200 and 400 g/m .
Further aspects and characteristics of the invention will be apparent from the patent claims and from the following description of a pre-ferred embodiment.
DESCRIPTION OF A PREFERRED EMBODIMENT
The laminated paper board according to the preferred embodiments was 10 manufactured with grammages of 255 and 310 g/m . In both cases one of the surface layers (the exterior layer) had a grammage of 70 g/m and the other (the interior layer) a grammage of 50 g/m . The surface layers consisted of bleached long fibre sulphate pulp refined to 24 SR (desired value) and with a density of approximately 690 kg/m (mean value). The centre layer consisted of about 45 % CTMP and 55 %
bleached long fibre sulphate pulp, the raw material of which was a mixture of wood from Nordic conifers (Pinus silvestris and Picea abies). The centre layer contained about 10 % (of the total mass of the centre layer) reinforcing pulp, refined to 75 SR (desired value).
The density of the centre layer was about 625 kg/m (mean value). The mean value of the drainage resistance of the centre layer was 30SR
(desired value). The raw material for the CTMP was wood from Picea abies.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A laminated paper board which is stiff and creasable and which does not impart undesirable smell or taste to liquid foods, consisting of at least three layers, characterized by having at least one central layer of cellulosic material of high bulk, and a density of between 500 and 700 kg/m3, comprising a mixture consisting mainly of chemically modified thermo-mechanical pulp (CTMP) and bleached long fibre sulphate pulp, and on each side of said at least one central layer surface layers of cellulosic material of higher strength and ductility than the at least one central layer and a density of between 640 and 750 kg/m3, the primary purpose of the at least one central layer being to keep the surface layers apart.
2. A paper board according to Claim 1, characterized in that said surface layers consist mainly of bleached long fibre sulphate pulp.
3. A paper board according to Claim 1, characterized in that the density of said at least one central layer is between 575 and 675 kg/m3, and that the density of the surface layer is between 660 and 720 kg/m3.
4. A paper board according to Claim 1, characterized in that the content of CTMP of said at least one central layer is from 30 to 70 percent by weight, the balance mainly being bleached long fibre sulphate pulp.
5. A paper board according to Claim 4 characterized in that the content of CTMP is from 40 to 60 percent by weight.
6. A paper board according to Claim 1, characterized in that at least a fraction of the sulphate pulp of the at least one central layer consists of more highly refined pulp than does the sulphate pulp of the surface layers, thus functioning as reinforcement of the pulp of the at least one central layer.
7. A paper board according to Claim 6 characterized in that said reinforcing fraction, comprising from 5 to 20% of the total mass of the at least one central layer is refined to a drainage resistance of at least 60°SR, while the sulphate pulp of the surface layers is refined to from 20 to 30°SR.
8. A paper board according to Claim 7, characterized in that said reinforcing fraction is refined to a drainage resistance of from 70 to 80°SR, while the sulphate pulp of the surface layers is refined to from 22 to 28°SR.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8304554-2 | 1983-08-23 | ||
| SE8304554A SE445937B (en) | 1983-08-23 | 1983-08-23 | COMPOSITION CARTON MATERIAL FOR LIQUID PACKAGING |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1251718A true CA1251718A (en) | 1989-03-28 |
Family
ID=20352272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000461352A Expired CA1251718A (en) | 1983-08-23 | 1984-08-20 | Laminated paper board for gable top containers |
Country Status (6)
| Country | Link |
|---|---|
| CA (1) | CA1251718A (en) |
| DE (2) | DE3427196A1 (en) |
| FI (1) | FI79575B (en) |
| FR (1) | FR2550993B1 (en) |
| SE (1) | SE445937B (en) |
| ZA (1) | ZA845552B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999002777A1 (en) * | 1997-07-07 | 1999-01-21 | Stora Kopparbergs Bergslags Ab | Cardboard having great rigidity and packing made thereof |
| US7056563B2 (en) | 2003-04-04 | 2006-06-06 | Weyerhaeuser Company | Hot cup made from an insulating paperboard |
| US7060159B2 (en) | 2003-04-04 | 2006-06-13 | Weyerhaeuser Company | Insulating paperboard |
| US7063771B2 (en) | 2003-04-04 | 2006-06-20 | Weyerhaeuser Company | Embossed insulating paperboard |
| US7108765B2 (en) | 2003-04-04 | 2006-09-19 | Weyerhaeuser Company | Method for making an insulating paperboard |
| US10240288B2 (en) | 2013-01-04 | 2019-03-26 | Stora Enso Oyj | Method of producing microfibrillated cellulose |
| WO2023084150A1 (en) * | 2021-11-11 | 2023-05-19 | Abnor Oy | Barrier board and a method to produce it |
| US11926128B2 (en) | 2018-06-27 | 2024-03-12 | Stora Enso Oyj | Light weight linerboard for corrugated board |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1117869B1 (en) * | 1998-09-03 | 2012-04-18 | Stora Enso Aktiebolag | Paper or paperboard laminate and method to produce such a laminate |
| SE519173C2 (en) | 2000-05-15 | 2003-01-21 | Stora Kopparbergs Bergslags Ab | Paper or cardboard laminates as well as ways of making such laminates |
| EP1630290A1 (en) * | 2004-08-26 | 2006-03-01 | Weyerhaeuser Company | Embossing insulating paperboard |
| RU2401355C2 (en) * | 2005-02-10 | 2010-10-10 | Стора Энсо Аб | High-quality cardboard and products made from it |
| SE2151254A1 (en) * | 2021-10-13 | 2023-04-14 | Stora Enso Oyj | Method for manufacturing a multiply paperboard, and a multiply paperboard |
-
1983
- 1983-08-23 SE SE8304554A patent/SE445937B/en unknown
-
1984
- 1984-07-18 ZA ZA845552A patent/ZA845552B/en unknown
- 1984-07-24 DE DE19843427196 patent/DE3427196A1/en not_active Withdrawn
- 1984-08-01 FI FI843029A patent/FI79575B/en not_active Application Discontinuation
- 1984-08-16 FR FR8412867A patent/FR2550993B1/en not_active Expired
- 1984-08-20 CA CA000461352A patent/CA1251718A/en not_active Expired
- 1984-08-23 DE DE8425021U patent/DE8425021U1/en not_active Expired
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999002777A1 (en) * | 1997-07-07 | 1999-01-21 | Stora Kopparbergs Bergslags Ab | Cardboard having great rigidity and packing made thereof |
| US6221212B1 (en) | 1997-07-07 | 2001-04-24 | Stora Kopparbergs Bergslags Ab | Cardboard having great reigidity |
| US7056563B2 (en) | 2003-04-04 | 2006-06-06 | Weyerhaeuser Company | Hot cup made from an insulating paperboard |
| US7060159B2 (en) | 2003-04-04 | 2006-06-13 | Weyerhaeuser Company | Insulating paperboard |
| US7063771B2 (en) | 2003-04-04 | 2006-06-20 | Weyerhaeuser Company | Embossed insulating paperboard |
| US7108765B2 (en) | 2003-04-04 | 2006-09-19 | Weyerhaeuser Company | Method for making an insulating paperboard |
| US10240288B2 (en) | 2013-01-04 | 2019-03-26 | Stora Enso Oyj | Method of producing microfibrillated cellulose |
| US11926128B2 (en) | 2018-06-27 | 2024-03-12 | Stora Enso Oyj | Light weight linerboard for corrugated board |
| WO2023084150A1 (en) * | 2021-11-11 | 2023-05-19 | Abnor Oy | Barrier board and a method to produce it |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2550993B1 (en) | 1987-02-13 |
| FI843029A (en) | 1985-02-24 |
| ZA845552B (en) | 1985-03-27 |
| FI843029A0 (en) | 1984-08-01 |
| FI79575B (en) | 1989-09-29 |
| SE8304554L (en) | 1985-02-24 |
| DE8425021U1 (en) | 1985-01-17 |
| DE3427196A1 (en) | 1985-03-07 |
| SE445937B (en) | 1986-07-28 |
| SE8304554D0 (en) | 1983-08-23 |
| FR2550993A1 (en) | 1985-03-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |