EP1409152B1 - Procede d'application a sec de matieres adhesives et a effet barriere sur des bandes et utilisation dudit procede - Google Patents

Procede d'application a sec de matieres adhesives et a effet barriere sur des bandes et utilisation dudit procede Download PDF

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Publication number
EP1409152B1
EP1409152B1 EP01999438A EP01999438A EP1409152B1 EP 1409152 B1 EP1409152 B1 EP 1409152B1 EP 01999438 A EP01999438 A EP 01999438A EP 01999438 A EP01999438 A EP 01999438A EP 1409152 B1 EP1409152 B1 EP 1409152B1
Authority
EP
European Patent Office
Prior art keywords
dry
barrier
polymers
onto
web
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 - Lifetime
Application number
EP01999438A
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German (de)
English (en)
Other versions
EP1409152A1 (fr
Inventor
Juha Maijala
Timo R. Nyberg
Veli KÄSMÄ
Kaisa Putkisto
Petri Peiponen
Toivo Kärnä
Kerstin Meinander
Mikael Skrifvars
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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Filing date
Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1409152A1 publication Critical patent/EP1409152A1/fr
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Publication of EP1409152B1 publication Critical patent/EP1409152B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • 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
    • D21H23/50—Spraying or projecting
    • 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
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape

Definitions

  • the present invention relates to a method and use of a method for the dry application of barrier and adhesive materials on moving webs of paper or board.
  • the invention particularly relates to dry-application of barrier polymers in the manufacture of packaging materials or laminates.
  • Barrier polymers are widely used in packaging materials to avoid or decrease the penetration of water vapour, fat, odours, microbes, etc. through packages. As very few materials stop the penetration of all these media, multilayer structures are often needed.
  • the manufacture of barrier layers is usually performed by extrusion of thermoplastic materials, such as variations of polyethylene and polypropylene, but also by dispersion coating.
  • the required polymers are molten and applied onto the web through a slit as a thin film.
  • the hot film adheres to the web mechanically, or in some cases, by means of an adherent material earlier applied to the web.
  • One major disadvantage of this method is that the polymer material has to be heated until it is completely molten and then it is forced through the slit. Both the heat and the mechanical force (shear stress) lead to the breakdown of the polymer structure, causing decrease in mechanical properties, and sometimes decomposition.
  • solvents or other liquid media are used, which require drying steps and consume energy.
  • An object of the invention is a method for the dry-application of barrier and/or adhesive material(s) onto a moving web of paper or board, in particular a method for the manufacture of materials, especially packaging materials and laminates, comprising one or several layers of barrier polymers.
  • a further object of the invention is the use of a dry-application method based on ionic blasting for the application of barrier and/or adhesive material(s) onto a moving web of paper or board.
  • moving paper or board webs may be coated by using a dry-application method with barrier and/or adhesive materials applicable in dry form.
  • small particles are applied onto the moving web without contacting it, by means of ionic blasting provided by high voltage, wherein the particles are charged by the ions formed by corona discharge. Thereafter, an electric field transfer the charged particles onto the web or the surface.
  • Suitable barrier and adhesive materials are polymeric materials, such as polyethylene, polypropylene, ethyl vinylacetate polymers, polyvinyl alcohol, polyamides, polyesters, ionomers, copolymers of vinylidene chloride and methyl acrylate and the like, which are frequently used in extrusion applications, and thermoplastic biodegradable polymers, such as polylactides, polyglycolides and their copolymers.
  • polystyrene polystyrene
  • polyacrylate polymethacrylate
  • poly(styrene-acrylate)copolymers plastic pigments based on melamin-formaldehyde and urea-formaldehyde or combinations thereof. If the polymeric materials are supplied as aqueous dispersions, they must be dried before the dry-application. This procedure is described in WO 01/00713 A1 .
  • the essential features of the polymers in the dry-application method are particle size, glass transition temperature (Tg) and electrostatic properties.
  • the diameter size of the particles, or particle agglomerates is between 0.01 and 500 ⁇ m, preferably between 1 and 50 ⁇ m. In the case the material is supplied in the form of pellets, it must be ground, optionally with dry ice, to a powder with suitable particle size.
  • the glass transition temperature (Tg) is preferably more than 40°, depending on the web material used and on characteristics of the polymer.
  • the polymer shall either be grindable or dryable and often a grinder is used in connection with application.
  • the barrier and/or adhesive material i.e. the polymer powder is applied onto the moving web, by using the dry-application method based on ionic blasting.
  • the web is selected from paper or board.
  • the powder layer is covered with a film (polyethylene terephthalate or other non-sticking material) to avoid potential sticking of the polymer material to the surface of the calender rolls during fixing.
  • the fixing is performed at temperatures suitable for the powder material, depending on nip pressure and calender speed.
  • the method according to the invention has several advantages over the state of the art.
  • the degrading effect of thermomechanical treatment on the polymeric material is decreased.
  • Such materials are for example thermoplastic biodegradable polymers, such as polylactides, polyglycolides and their copolymers.
  • the dry-application method allows the introduction of the adhesive layer in the lamination process without solvents or other liquid media, thus avoiding drying steps and saving energy.
  • the dry-application method allows one or more layers of one or different polymers to be applied before fixation. Also the thickness of the applied dry layer can be varied starting from very thin ( ⁇ 1g/m 2 ) layers.
  • the fixing parameters such as characteristics of the powder material, temperature, nip pressure and calender speed will define the upper limit for each product.
  • the base materials chosen for the experiments were webs of paper (81,4 g/m 2 ) and aluminium foil.
  • the dry-application barrier and/or adhesive materials were chosen among materials used in paper coating and lamination, especially in extrusion applications. These materials are usually provided in the form of pellets with a diameter of 1 - 2 mm, and the material must thus be ground to a powder before application.
  • the tests were made with powders produced with a laboratory grinder. To avoid sticking the pellets were fed into the grinder together with dry ice. This grinder had a 0.25 mm screen, resulting in that the biggest fraction of the polymer powder was 0.25 mm.
  • the powders were applied to the webs by a laboratory dry coating device.
  • the feeding was kept constant in all trials (24 g/m 2 ).
  • the calender speed was kept constant in all trials (about 6 rpm, accounting for about 5 m/min web speed).
  • Three temperature ranges were used, 150, 170 and 190°C, and three nip pressures, 50, 100 and 150 bar, corresponding to 12, 25 and 37 kN/m linear load, respectively.
  • the produced structures were tested for grammage, thickness and pinholes. For some samples the water vapour transmission rate (WVTR) was measured, too. Additionally the lamination structures were tested for delamination. For all materials the applicability of the material upon the web and the appearance of the produced structure were visually assessed.
  • WVTR water vapour transmission rate
  • Polyethylene powder with a particle size (diameter) below 0.25 mm was applied onto the paper web by using the dry-application technique.
  • the application of the polyethylene powder onto the paper was satisfying, however the coating amount varied much, from 12.1 to 26.0 g/m 2 , the average being 18.2 g/m 2 .
  • the thickness varied between 19.6 and 25.1 ⁇ m, average 22.6 ⁇ m.
  • Table 2 The results are presented in Table 2.
  • the water vapour transmission rate was best (lowest) for samples prepared at 190°C, approximately 145 g/m 2 /day.
  • Table 1 Grammage and thickness of raw materials Webs Grammage, g/m 2 Thickness, ⁇ m Average St dev* Average St dev* Paper web 81,4 0,2 95,8 0,2 *Standard deviation Table 2. Grammage and thickness of coatings and laminate layers Coatings Example no Grammage, g/m 2 Thickness, ⁇ m Average St dev Average St dev Polyethylene 1 18,2 6,3 22,6 2,7 Saran MA 119 2 20,0 4,4 16,4 3,3 Saran MA 119 is a copolymer of vinylidene chloride and methylacrylate.
  • the polylactide sample was a non-commercial sample of poly(L-lactide) with a molecular weight of about 90 000 g/mole.
  • the material was applied to the paper web using the dry-application technique. Uneven ground powder polylactide led to an uneven application result. The adhesion to the paper web was, however, good.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Claims (10)

  1. Procédé d'application à sec de matières barrières et/ou adhésives sur une bande de papier ou de carton en mouvement, caractérisé en ce que de la matière polymère pulvérulente possédant une dimension de particules ou d'agglomérats de particules comprise entre 0,01 et 500 m, de préférence entre 1 et 50 µm, est appliquée à sec par soufflage ionique sur la bande de papier ou de carton, et dans lequel la surface de la couche appliquée est recouverte d'un film qui est fait d'une matière non collante, avant la fixation exécutée au moyen d'une calandre.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on utilise du polytéréphtalate d'éthylène comme film de recouvrement.
  3. Procédé selon la revendication 1, caractérisé en ce que la matière polymère est choisie dans le groupe composé des substances suivantes : polyéthylène, polypropylène, polymères d'acétate d'éthyle vinyle, alcool polyvinylique, polyamides, polyesters, polystyrène, polyacrylate, polyméthacrylate, copolymères de poly(styrène-acrylate), polymères thermoplastiques biodégradables tels que les polylactides, les polyglycolides et leurs copolymères, pigments plastiques à base de mélamine-formaldéhyde et d'urée-formaldéhyde ou des combinaisons de ces substances.
  4. Procédé selon la revendication 1 pour la fabrication de matériaux d'emballage ou de stratifiés comprenant des polymères barrières.
  5. Procédé de fabrication de matériaux d'emballage ou de stratifiés comprenant des polymères barrières selon la revendication 4, caractérisé en ce que la matière polymère est choisie dans le groupe composé des substances suivantes : polyéthylène, polypropylène, polymères d'acétate d'éthyle vinyle, alcool polyvinylique, polyamides, polyesters, ionomères, polystyrène, polyacrylate, polyméthacrylate, copolymères de poly(styrène-acrylate), polymères thermoplastiques biodégradables tels que les polyactides, les polyglycolides et leurs copolymères, pigments plastiques à base de mélamine- formaldéhyde et d'urée-formaldéhyde ou des combinaisons de ces substances.
  6. Procédé de fabrication de matériaux d'emballage ou de stratifiés comprenant des polymères barrières selon la revendication 4 ou 5, caractérisé en ce que plusieurs couches comprenant les mêmes polymères ou des polymères différents sont appliquées sur la bande avant la fixation exécutée avec une calandre.
  7. Utilisation d'un procédé d'application à sec basé sur le soufflage ionique pour l'application de matières barrières et/ou adhésives sur une bande de papier ou de carton en mouvement, caractérisée en ce que de la matière polymère pulvérulente possédant une dimension de particules ou d'agglomérats de particules comprise entre 0,1 et 500 µm, de préférence entre 1 et 50 µm, est appliquée à sec par soufflage ionique sur la bande de papier ou de carton, et dans lequel la surface de la couche appliquée est recouverte d'un film qui est fait d'une matière non collante, avant la fixation exécutée au moyen d'une calandre.
  8. Utilisation selon la revendication 7, caractérisée en ce que la matière polymère est choisie dans le groupe composé des substances suivantes : polyéthylène, polypropylène, polymères d'acétate d'éthyle vinyle, alcool polyvinylique, polyamides, polyesters, ionomères, polystyrène, polyacrylate, polyméthacrylate, copolymères de poly(styrène-acrylate), polymères thermoplastiques biodégradables, tels que les polyacides, les polyglycolides et leurs copolymères, pigments plastiques à base de mélamine- formaldéhyde et d'urée-formaldéhyde ou des combinaisons de ces substances.
  9. Utilisation selon la revendication 7 ou 8, caractérisée en ce que plusieurs couches comprenant les mêmes polymères ou des polymères différents sont appliquées sur la bande avant la fixation.
  10. Utilisation selon l'une quelconque des revendications 7 à 9, caractérisée en ce que le film de recouvrement est du polytéréphtalate d'éthylène.
EP01999438A 2000-12-07 2001-12-05 Procede d'application a sec de matieres adhesives et a effet barriere sur des bandes et utilisation dudit procede Expired - Lifetime EP1409152B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20002678 2000-12-07
FI20002678A FI20002678A0 (fi) 2000-12-07 2000-12-07 Menetelmä sulku- ja liimamateriaalien kuiva-applikoimiseksi rainoille
PCT/FI2001/001059 WO2002045869A1 (fr) 2000-12-07 2001-12-05 Procede d'application a sec de matieres adhesives et a effet barriere sur des bandes et utilisation dudit procede

Publications (2)

Publication Number Publication Date
EP1409152A1 EP1409152A1 (fr) 2004-04-21
EP1409152B1 true EP1409152B1 (fr) 2009-07-29

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ID=8559660

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EP01999438A Expired - Lifetime EP1409152B1 (fr) 2000-12-07 2001-12-05 Procede d'application a sec de matieres adhesives et a effet barriere sur des bandes et utilisation dudit procede

Country Status (6)

Country Link
EP (1) EP1409152B1 (fr)
AT (1) ATE437704T1 (fr)
AU (1) AU2002216141A1 (fr)
DE (1) DE60139425D1 (fr)
FI (1) FI20002678A0 (fr)
WO (1) WO2002045869A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI121810B (fi) * 2002-03-14 2011-04-29 Metso Paper Inc Menetelmä kalvon muodostamiseksi
FI121087B (fi) * 2002-11-14 2010-06-30 Metso Paper Inc Päällystysmenetelmä
US20040265504A1 (en) * 2003-06-27 2004-12-30 Christophe Magnin Non-metalic substrate having an electostatically applied activatable powder adhesive
DE102009003473A1 (de) 2009-02-12 2010-09-23 Fsd Folienservice Deutschland Gmbh Kaschierverfahren sowie Kaschiervorrichtung
FI20215817A1 (en) * 2021-07-21 2023-01-22 Teknos Group Oy Process for the production of coated fiber products

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001000713A1 (fr) * 1999-06-24 2001-01-04 Dynea Chemicals Oy Pigment polymere applicable a sec

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1285551A (en) * 1969-05-28 1972-08-16 British Industrial Plastics Production of foils
US4027366A (en) * 1973-08-02 1977-06-07 Beatrice Foods Co. Multilayer coated substrate
US3919345A (en) * 1974-03-04 1975-11-11 Ford Motor Co Powdered coating composition containing polyanhydride, epoxy and anhydride functional copolymer and flow control agent
US4296142A (en) * 1978-06-26 1981-10-20 Union Carbide Corporation Method for coating a tubular food casing
US5176755A (en) * 1990-02-14 1993-01-05 Armco Inc. Plastic powder coated metal strip

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001000713A1 (fr) * 1999-06-24 2001-01-04 Dynea Chemicals Oy Pigment polymere applicable a sec

Also Published As

Publication number Publication date
ATE437704T1 (de) 2009-08-15
DE60139425D1 (de) 2009-09-10
EP1409152A1 (fr) 2004-04-21
AU2002216141A1 (en) 2002-06-18
WO2002045869A1 (fr) 2002-06-13
FI20002678A0 (fi) 2000-12-07

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