WO2000053414A1 - Method to manufacture a packaging material - Google Patents

Method to manufacture a packaging material Download PDF

Info

Publication number
WO2000053414A1
WO2000053414A1 PCT/FI2000/000184 FI0000184W WO0053414A1 WO 2000053414 A1 WO2000053414 A1 WO 2000053414A1 FI 0000184 W FI0000184 W FI 0000184W WO 0053414 A1 WO0053414 A1 WO 0053414A1
Authority
WO
WIPO (PCT)
Prior art keywords
packaging material
grease
cellulose
based raw
raw material
Prior art date
Application number
PCT/FI2000/000184
Other languages
French (fr)
Inventor
Rune SKÅTAR
Original Assignee
Upm-Kymmene Corporation
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 Corporation filed Critical Upm-Kymmene Corporation
Publication of WO2000053414A1 publication Critical patent/WO2000053414A1/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
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/30—Pretreatment of the 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene
    • 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
    • B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
    • 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
    • B32B2377/00—Polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/02—Open containers
    • B32B2439/06—Bags, sacks, sachets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/824—Paper comprising more than one coating superposed two superposed coatings, both being non-pigmented
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • 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
    • D21H27/10—Packing paper

Definitions

  • the object of the present invention is to provide a method for the manufacture of packaging material for the food industry.
  • the material according to the invention is plastic coated water and grease resistant paper.
  • the known grease resistant packaging materials have been treated, for example, with chromium complexes, fluorine or silicone compounds. These compounds have either been added to the pulp or applied as a surface treatment. The surface treatment takes place either as an on-machine or off-machine process.
  • the coating plastic can be polyamide, polyethylene, polyester, polypropylene or modified polyolefin.
  • the method according to the invention is mainly characterized by what is set forth in the characterising part of the appended patent claim 1.
  • kit rating above 5 means a grease resistance rating obtained by a test method generally known in the field, method developed by 3M
  • plastic forms an effective barrier against the penetration of grease and, in addition, the plastic coating gives protection against abrasion, i. e. sharp edged food pellets will not break the package.
  • An example of such food pellet is dry food for pets, such as cats and dogs, which food also contains grease.
  • the resistance treatment of paper decisively slows down the progress of penetration of grease when the foodstuff comes in contact with the paper. This is particularly important in the seams of bags and sacks, in which the cut edge of the paper is folded inside the package. Unless the paper has undergone resistance treatment, the grease will soak through the cut edge to the outside of the package.
  • Fig. 1 illustrates an extrusion coating line
  • Fig. 2 illustrates the structure of the packaging material
  • Fig. 3 illustrates the cross-section of a bag or a sack
  • paper with a grammage in the range of 60 to 100 g/m for example 60, 90 or 100 g/m .
  • dispersion adhesive of polyethylene-imine type is spread at 0.1-3.0 g/m 2 calculated as solid matter, on paper 2, which has been treated with a fluorine compound and whose kit rating is above 5.
  • the adhesive is dried and the adhesive layer is treated by flame treatment or corona treatment at point 8.
  • Molten plastic 5, which can be polyamide, polyester, polyethylene, polypropylene or modified polyolefin is extruded from extrusion die 4 between pressure roll 3 and chill roll 6.
  • the amount of plastic applied is 12-35 g/m 2 .
  • the pressure roll presses the plastic 5 against chill roll 6 and simultaneously onto paper 2. From the chill roll the coated paper passes to the take-off roll 7, from where the paper continues to the winding of the finished material.
  • the finished packaging material as illustrated in fig. 2 comprises fluorine treated paper 2, a dispersion adhesive layer 8 and plastic coating 9. Bags and sacks according to fig. 3 are made of the finished packaging material and are sealed by means of heat sealing with the aid of plastic coating 9. Along the side seam inside the package there remains a cut edge 10 of the paper, which edge has been resistance treated to prevent the penetration of grease.
  • the dispersion adhesive can be spread on the paper already at the stage of manufacturing the paper, in which case the coating with plastic takes place in a separate process.
  • Other techniques can also be applied for the sealing of sacks than heat sealing, for example hot-melt gluing or cold gluing. What is essential is that the method according to the invention enables excellent adhesion to plastic of paper which has undergone intense grease resistance treatment.

Landscapes

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

Abstract

The object of the invention is a method for the manufacturing of packaging material. The packaging material comprises cellulose based raw material treated to be grease and/or water resistant (2) for packaging material and a plastic coating (9). Said cellulose-based raw material treated to be grease and/or water resistant for packaging material is pretreated with a surface tension raising agent before coating with plastic.

Description

METHOD TO MANUFACTURE A PACKAGING MATERIAL
The object of the present invention is to provide a method for the manufacture of packaging material for the food industry. The material according to the invention is plastic coated water and grease resistant paper.
The known grease resistant packaging materials have been treated, for example, with chromium complexes, fluorine or silicone compounds. These compounds have either been added to the pulp or applied as a surface treatment. The surface treatment takes place either as an on-machine or off-machine process. In addition, it is also known in the prior art to coat paper with plastic whereby the paper becomes grease resistant. The coating plastic can be polyamide, polyethylene, polyester, polypropylene or modified polyolefin.
It is generally known that good adhesion of plastic to paper requires pretreatment of the paper surface in order to increase the surface tension of the paper. As such methods for increasing surface tension, flame treatment, corona treatment or a combination thereof can be used.
The problem with the coating methods of paper is that the known pretreatments, for example flame or corona treatment are no longer effective when the grease resistance treatment is very intense. By means of the method according to the present invention, paper which has undergone intense resistance treatment can be coated with plastic after having first been treated with an agent that raises surface tension.
The method according to the invention is mainly characterized by what is set forth in the characterising part of the appended patent claim 1.
By means of the method according to the present invention, paper which has undergone intense grease resistance treatment (kit rating above 5, kit rating means a grease resistance rating obtained by a test method generally known in the field, method developed by 3M) can be coated with plastic, thereby creating durable protection against the penetration of grease through the packaging material. Plastic forms an effective barrier against the penetration of grease and, in addition, the plastic coating gives protection against abrasion, i. e. sharp edged food pellets will not break the package. An example of such food pellet is dry food for pets, such as cats and dogs, which food also contains grease. The resistance treatment of paper, on the other hand, decisively slows down the progress of penetration of grease when the foodstuff comes in contact with the paper. This is particularly important in the seams of bags and sacks, in which the cut edge of the paper is folded inside the package. Unless the paper has undergone resistance treatment, the grease will soak through the cut edge to the outside of the package.
In the following, the invention is described in more detail with reference to the accompanying drawings, wherein:
Fig. 1 illustrates an extrusion coating line Fig. 2 illustrates the structure of the packaging material
Fig. 3 illustrates the cross-section of a bag or a sack
In the manufacturing of the packaging material according to the present invention, paper with a grammage in the range of 60 to 100 g/m , for example 60, 90 or 100 g/m , is used. At point 1 on an extrusion coating line, before extrusion die 4, dispersion adhesive of polyethylene-imine type is spread at 0.1-3.0 g/m2 calculated as solid matter, on paper 2, which has been treated with a fluorine compound and whose kit rating is above 5. The adhesive is dried and the adhesive layer is treated by flame treatment or corona treatment at point 8. Molten plastic 5, which can be polyamide, polyester, polyethylene, polypropylene or modified polyolefin is extruded from extrusion die 4 between pressure roll 3 and chill roll 6. The amount of plastic applied is 12-35 g/m2. The pressure roll presses the plastic 5 against chill roll 6 and simultaneously onto paper 2. From the chill roll the coated paper passes to the take-off roll 7, from where the paper continues to the winding of the finished material.
The finished packaging material as illustrated in fig. 2 comprises fluorine treated paper 2, a dispersion adhesive layer 8 and plastic coating 9. Bags and sacks according to fig. 3 are made of the finished packaging material and are sealed by means of heat sealing with the aid of plastic coating 9. Along the side seam inside the package there remains a cut edge 10 of the paper, which edge has been resistance treated to prevent the penetration of grease.
It is obvious that the different applications of the invention are not limited to the above- mentioned example, but can vary within the scope of the patent claims set forth below. The dispersion adhesive can be spread on the paper already at the stage of manufacturing the paper, in which case the coating with plastic takes place in a separate process. Other techniques can also be applied for the sealing of sacks than heat sealing, for example hot-melt gluing or cold gluing. What is essential is that the method according to the invention enables excellent adhesion to plastic of paper which has undergone intense grease resistance treatment.

Claims

Claims
1. A method for the manufacturing of packaging material, which packaging material consists of cellulose-based raw material treated to be grease and/or water resistant (2) for packaging material and plastic coating (9), characterized in that the cellulose-based raw material treated to be grease and/or water resistant (2) for packaging material is pretreated before plastic coating with a surface tension raising agent
2. A method according to patent claim 1 above, characterized in that said surface tension raising agent is a dispersion adhesive of polyethylene-imine type.
3. A method according to patent claims 1 and 2 above, characterized in that said surface tension raising agent is added to the paper in connection with the papermaking as a separate process, or in connection with the coating as part of a continuous process.
4. A method according to any of the above patent claims, characterized in that said plastic is a polyamide, polyester, polyethylene, polypropylene or modified polyolefin.
5. A method according to any of the above patent claims, characterized in that the kit rating of the cellulose-based raw material treated to be grease and/or water resistant (2) for packaging material is higher than 5.
6. A method according to any of the above patent claims, characterized in that the cellulose-based raw material treated to be grease and/or water resistant (2) for packaging material is paper treated with a fluorine compound.
7. A method according to patent claim 6, characterized in that the treatment with fluorine compound is performed by adding the compound directly to the pulp or as a surface treament process on or off the paper machine.
8. A method according to any of the above patent claims, characterized in that bags or sacks are manufactured from plastic coated cellulose-based raw material treated to be grease and/or water resistant (2) for packaging material, the seam of which bags and sacks being closed in such manner that the edge (10) of said cellulose-based raw material for packaging material remains inside the bag or sack.
9. A method according to patent claim 8, characterized in that the seam of the bag or sack is closed by means of heat sealing, hot-melt gluing or cold gluing.
PCT/FI2000/000184 1999-03-10 2000-03-09 Method to manufacture a packaging material WO2000053414A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI990514 1999-03-10
FI990514A FI990514A (en) 1999-03-10 1999-03-10 Method for making packaging material

Publications (1)

Publication Number Publication Date
WO2000053414A1 true WO2000053414A1 (en) 2000-09-14

Family

ID=8554137

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2000/000184 WO2000053414A1 (en) 1999-03-10 2000-03-09 Method to manufacture a packaging material

Country Status (2)

Country Link
FI (1) FI990514A (en)
WO (1) WO2000053414A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004081285A1 (en) * 2003-03-13 2004-09-23 Metso Paper Inc. Method for producing coated paper or board
EP1894714A1 (en) 2006-08-31 2008-03-05 Papier-Mettler Inh. Michael Mettler Composite paper and bags for foodstuffs, in particular for prebaked bakery products, contain the composite paper, and a method for manufacturing such a bag
US8512831B2 (en) 2002-12-03 2013-08-20 Tokyo Paper Mfg. Co., Ltd. Laminate and, paper container and package using the same

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2369450A (en) * 1939-06-14 1945-02-13 Gardner Richardson Co Paper manufacture
US3775239A (en) * 1971-05-24 1973-11-27 Rap Ind Inc Packaging material, packages and method of making same
JPS5816236A (en) * 1981-06-26 1983-01-29 Fujimori Kogyo Kk Photographic product
JPS5831715A (en) * 1981-08-19 1983-02-24 Sadami Ito Method of sticking plastic film on adhesive auxiliary layer surface on base
JPS62141040A (en) * 1985-12-17 1987-06-24 Showa Denko Kk Olefin resin film or sheet
EP0397510A2 (en) * 1989-05-11 1990-11-14 Elopak Systems Ag Laminated paperboard container with absorption resistance means, and blank for constructing same
WO1993025057A1 (en) * 1992-05-27 1993-12-09 Conagra, Inc. Food trays and the like having press-applied coatings
JPH0655702A (en) * 1992-08-07 1994-03-01 Goyo Paper Working Co Ltd Liquid receptacle base material having regenerative usage ability
EP0676282A1 (en) * 1992-12-28 1995-10-11 Nihon Tetra Pak K.K. Wrapping material, and method and apparatus for manufacturing the same
US5558940A (en) * 1994-07-27 1996-09-24 Bayer Aktiengesellschaft Oil- and water-repellent papers, processes for their production and new fluorine-containing copolymers for this purpose
US5827616A (en) * 1995-07-24 1998-10-27 Sibille Dalle Coated greaseproof paper and process for manufacturing it

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2369450A (en) * 1939-06-14 1945-02-13 Gardner Richardson Co Paper manufacture
US3775239A (en) * 1971-05-24 1973-11-27 Rap Ind Inc Packaging material, packages and method of making same
JPS5816236A (en) * 1981-06-26 1983-01-29 Fujimori Kogyo Kk Photographic product
JPS5831715A (en) * 1981-08-19 1983-02-24 Sadami Ito Method of sticking plastic film on adhesive auxiliary layer surface on base
JPS62141040A (en) * 1985-12-17 1987-06-24 Showa Denko Kk Olefin resin film or sheet
EP0397510A2 (en) * 1989-05-11 1990-11-14 Elopak Systems Ag Laminated paperboard container with absorption resistance means, and blank for constructing same
WO1993025057A1 (en) * 1992-05-27 1993-12-09 Conagra, Inc. Food trays and the like having press-applied coatings
JPH0655702A (en) * 1992-08-07 1994-03-01 Goyo Paper Working Co Ltd Liquid receptacle base material having regenerative usage ability
EP0676282A1 (en) * 1992-12-28 1995-10-11 Nihon Tetra Pak K.K. Wrapping material, and method and apparatus for manufacturing the same
US5558940A (en) * 1994-07-27 1996-09-24 Bayer Aktiengesellschaft Oil- and water-repellent papers, processes for their production and new fluorine-containing copolymers for this purpose
US5827616A (en) * 1995-07-24 1998-10-27 Sibille Dalle Coated greaseproof paper and process for manufacturing it

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 198731, Derwent World Patents Index; AN 1987-216282, SHOWA DENKO KK.: "Antistatic olefin resin film or sheet - obtd. by spraying surfactant contg. water on film or sheet contg. antistatic agent" *
DATABASE WPI Week 199413, Derwent World Patents Index; AN 1994-106393 *
PATENT ABSTRACTS OF JAPAN *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8512831B2 (en) 2002-12-03 2013-08-20 Tokyo Paper Mfg. Co., Ltd. Laminate and, paper container and package using the same
WO2004081285A1 (en) * 2003-03-13 2004-09-23 Metso Paper Inc. Method for producing coated paper or board
EP1894714A1 (en) 2006-08-31 2008-03-05 Papier-Mettler Inh. Michael Mettler Composite paper and bags for foodstuffs, in particular for prebaked bakery products, contain the composite paper, and a method for manufacturing such a bag

Also Published As

Publication number Publication date
FI990514A (en) 2000-09-11
FI990514A0 (en) 1999-03-10

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