EP2388203A1 - Sac en papier comportant une combinaison de papier en kraft et papier de carton recyclé - Google Patents

Sac en papier comportant une combinaison de papier en kraft et papier de carton recyclé Download PDF

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Publication number
EP2388203A1
EP2388203A1 EP10163280A EP10163280A EP2388203A1 EP 2388203 A1 EP2388203 A1 EP 2388203A1 EP 10163280 A EP10163280 A EP 10163280A EP 10163280 A EP10163280 A EP 10163280A EP 2388203 A1 EP2388203 A1 EP 2388203A1
Authority
EP
European Patent Office
Prior art keywords
paper
sack
layer
containerboard
recycled
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.)
Withdrawn
Application number
EP10163280A
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German (de)
English (en)
Inventor
Franco Benedetti
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP10163280A priority Critical patent/EP2388203A1/fr
Publication of EP2388203A1 publication Critical patent/EP2388203A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/01—Ventilation or drainage of bags
    • 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 present invention relates to a paper sack, in particular a paper sack for fine-grained bulk material such as cement, gypsum, granulate, animal feed etc.
  • the paper sacks may be configured as valve sacks or open mouth sacks which are sewn, pasted or folded, but the invention is not limited to these types of sacks.
  • Such paper sacks may comprise a bottom portion, an upper portion, a front portion and rear portion, which delimit an interior volume, and it is known from the prior art that the material for these portions are generally composed of a plurality of layers of sack kraft paper.
  • the latter is formed of softwood sulfate pulp and comprises comparatively long fibers so that it has a high tensile strength. This can be expressed by the TEA index as defined in ISO No. 1924-3.
  • the material of the paper sacks also has a minimum thickness/stiffness so as to be suitable to be handled on the machines producing the sacks and on the filling machines.
  • sack kraft paper has a high tensile strength as outlined above but the stiffness is relatively low.
  • a plurality of sack kraft paper layers are combined which results in a material having a high tensile strength as well as a sufficient thickness/stiffness.
  • a paper sack comprising at least a front portion and a rear portion, wherein said portions delimit an interior volume
  • the material (9) forming said portions comprises a first layer and a second layer, wherein the first layer is formed of sack kraft paper and wherein the second layer is formed of recycled containerboard paper.
  • the present invention bases on the idea that already a single layer of sack kraft paper preferably having a grammage, i.e. a weight per unit area, between 60 g/m 2 and 120 g/m 2 , suffices to provide a certain level of tensile strength that is sufficient for most of the products filled in the sacks, and that for the handling of a paper sack it is only required that in addition to that level of tensile strength a certain thickness/stiffness must be obtained.
  • recycled containerboard paper in particular Testliner and/or Fluting material, can be used although its tensile strength is comparatively low which in principle prevents it from being used in paper sack material.
  • the present invention provides for a more cost-effective and environmentally advantageous way of producing paper sacks.
  • the material forming the portions of the sack may comprise further layers such as third and fourth layers.
  • the first or the second layer may form that layer which directly faces the inner volume.
  • the first and second layers are inside the material and do not have direct contact with the inner volume.
  • the sack kraft paper which forms the first layer has a TEA index of at least 1.3 J/g (MD and CD).
  • the recycled containerboard paper for the second layer has a grammage of 70 - 120 g/m 2 .
  • a further preferred embodiment of a paper sack according to the present invention is formed of a material which has an overall stiffness of at least 55 mN according to ISO 2493.
  • the second layer is perforated so as to allow air in the inner volume to escape when the sack is filled.
  • the material of the paper sack according to the present invention comprises a barrier layer which is arranged between the first layer and the second layer, the barrier layer preventing moisture from entering the inner volume.
  • the barrier layer is formed of Polyethylene (PE) or other materials having a VTR ⁇ 400g/m 2 /day.
  • a paper sack 1 according to the present invention that can be used for fine-grained bulk material such as cement, gypsum, granulate, animal feed etc., is formed by a bottom portion 3, an upper portion 5, a front portion 7 and a rear portion (not shown) wherein in this Figure the bottom and upper portions 3, 5 are folded onto the front portion 7.
  • the afore-mentioned portions 3, 5, 7 delimit the inner volume of the sack to be filled with the afore-mentioned variety of products.
  • a material comprising at least one layer of recycled containerboard paper may also be employed in sewn, pasted or folded valve sacks and in pinched or sewn open mouth sacks.
  • the invention is neither limited to these types.
  • this material comprises a first outer layer 11 which faces away from the inner volume sack 1.
  • This first outer layer 11 is formed of sack kraft paper which preferably has a TEA index of at least 1.3 J/g (MD and CD) and a grammage (weight per unit area) between 60 g/m 2 and 120g/m 2 .
  • Sack kraft paper is made up from softwood sulfate pulp so that it is composed of long fibers to provide the large tensile strength.
  • the TEA index is measured according to the method as defined in ISO 1924-3.
  • a second inner layer 13 which faces to the inner volume of the sack, is provided in the material 9, the second inner layer 13 being formed of recycled containerboard paper, in particular Testliner and/or Fluting material.
  • the recycled containerboard paper material of the second inner layer 13 has a grammage between 70 g/m 2 and 120 g/m 2 .
  • the material 9 of the sack 1 has an overall stiffness of at least 55 mN.
  • the material 9 of the sack 1 comprises a barrier layer 15 which is arranged between the first outer and second inner layers 11, 13 and composed of a material preventing moisture from entering the inner volume.
  • the barrier layer 15 is formed of Polyethylene (PE).
  • the second inner layer 13 may be perforated so that air contained in the inner volume may escape through the second inner layer 13 during filling of the sack 1.
  • the material forming the portions 3, 5, 7 of the sack 1 may comprise further layers such as third and fourth layers.
  • the second layer 13 directly faces the inner volume of the sack 1, it is generally possible and within the scope of the invention that the first layer may directly contact the inner volume.
  • the first and second layers 11, 13 are inside the material and do not have contact with the inner volume.
EP10163280A 2010-05-19 2010-05-19 Sac en papier comportant une combinaison de papier en kraft et papier de carton recyclé Withdrawn EP2388203A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10163280A EP2388203A1 (fr) 2010-05-19 2010-05-19 Sac en papier comportant une combinaison de papier en kraft et papier de carton recyclé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10163280A EP2388203A1 (fr) 2010-05-19 2010-05-19 Sac en papier comportant une combinaison de papier en kraft et papier de carton recyclé

Publications (1)

Publication Number Publication Date
EP2388203A1 true EP2388203A1 (fr) 2011-11-23

Family

ID=42735941

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10163280A Withdrawn EP2388203A1 (fr) 2010-05-19 2010-05-19 Sac en papier comportant une combinaison de papier en kraft et papier de carton recyclé

Country Status (1)

Country Link
EP (1) EP2388203A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3168362A1 (fr) * 2015-11-10 2017-05-17 BillerudKorsnäs AB Papier pour machine à formage-remplissage-scellage verticale
EP3184296A1 (fr) * 2015-12-21 2017-06-28 BillerudKorsnäs AB Sac en papier résistant à la pluie

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997046376A1 (fr) * 1994-12-05 1997-12-11 Upm-Kymmene Oy Sac muni d'un fond plan
WO1999002772A1 (fr) * 1997-07-09 1999-01-21 Assidomän AB Papier kraft et son procede de fabrication
US20010011584A1 (en) * 1999-12-15 2001-08-09 Valmet-Karlstad Ab Arrangement and method for forming a multilayered paper or paperboard web
US20030232211A1 (en) * 2002-06-17 2003-12-18 Appleton Papers Inc. Composite packaging materials and printable sheets, and methods of making
DE202005003539U1 (de) * 2005-03-04 2006-07-13 Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh Papiersack
WO2007014148A1 (fr) * 2005-07-22 2007-02-01 International Paper Company Substrat papier contenant un compose comportant du fluor et presentant une impermeabilite a la graisse et une aptitude au collage ameliorees
WO2009153225A1 (fr) * 2008-06-17 2009-12-23 Akzo Nobel N.V. Produit cellulosique

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997046376A1 (fr) * 1994-12-05 1997-12-11 Upm-Kymmene Oy Sac muni d'un fond plan
WO1999002772A1 (fr) * 1997-07-09 1999-01-21 Assidomän AB Papier kraft et son procede de fabrication
US20010011584A1 (en) * 1999-12-15 2001-08-09 Valmet-Karlstad Ab Arrangement and method for forming a multilayered paper or paperboard web
US20030232211A1 (en) * 2002-06-17 2003-12-18 Appleton Papers Inc. Composite packaging materials and printable sheets, and methods of making
DE202005003539U1 (de) * 2005-03-04 2006-07-13 Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh Papiersack
WO2007014148A1 (fr) * 2005-07-22 2007-02-01 International Paper Company Substrat papier contenant un compose comportant du fluor et presentant une impermeabilite a la graisse et une aptitude au collage ameliorees
WO2009153225A1 (fr) * 2008-06-17 2009-12-23 Akzo Nobel N.V. Produit cellulosique

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3168362A1 (fr) * 2015-11-10 2017-05-17 BillerudKorsnäs AB Papier pour machine à formage-remplissage-scellage verticale
WO2017080910A1 (fr) * 2015-11-10 2017-05-18 Billerudkorsnäs Ab Papier pour machine verticale de formage, remplissage et scellage
US10570569B2 (en) 2015-11-10 2020-02-25 Billerudkorsnas Ab Paper for vertical form fill seal machine
EP3184296A1 (fr) * 2015-12-21 2017-06-28 BillerudKorsnäs AB Sac en papier résistant à la pluie
EP3184297A1 (fr) * 2015-12-21 2017-06-28 BillerudKorsnäs AB Papier d'ensachage résistant à la pluie

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