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1. (EP3414282) METHODS FOR MAKING PAPER OR BOARD, A BOARD TRAY AND PULP PARTICLES COATED WITH FOAMABLE POLYMER FOR USE IN THE SAME

Office : European Patent Office
Application Number: 17749943 Application Date: 06.02.2017
Publication Number: 3414282 Publication Date: 19.12.2018
Publication Kind : A4
Designated States: AL, AT, BA, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LI, LT, LU, LV, MC, ME, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR
Prior PCT appl.: Application Number:IB2017050629 ; Publication Number: Click to see the data
IPC:
C08J 9/16
B32B 3/30
B32B 5/20
B32B 27/10
B32B 29/00
B65D 1/34
C08J 9/22
D21F 11/00
D21H 17/33
D21H 19/84
D21H 21/56
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
J
WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H142
9
Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
16
Making expandable particles
B PERFORMING OPERATIONS; TRANSPORTING
32
LAYERED PRODUCTS
B
LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
3
Layered products essentially comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products essentially having particular features of form
26
characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids
30
characterised by a layer formed with recesses or projections, e.g. grooved, ribbed
B PERFORMING OPERATIONS; TRANSPORTING
32
LAYERED PRODUCTS
B
LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
5
Layered products characterised by the non-homogeneity or physical structure of a layer
18
characterised by features of a layer containing foamed or specifically porous material
20
foamed in situ
B PERFORMING OPERATIONS; TRANSPORTING
32
LAYERED PRODUCTS
B
LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
27
Layered products essentially comprising synthetic resin
06
as the main or only constituent of a layer next to another layer of a specific substance
10
of paper or cardboard
B PERFORMING OPERATIONS; TRANSPORTING
32
LAYERED PRODUCTS
B
LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
29
Layered products essentially comprising paper or cardboard
B PERFORMING OPERATIONS; TRANSPORTING
65
CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
D
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
1
Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material
34
Trays or like shallow containers
C CHEMISTRY; METALLURGY
08
ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
J
WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H142
9
Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
22
After-treatment of expandable particles; Forming foamed products
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
F
PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
11
Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibreboard production, on paper-making machines
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
H
PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C, D21D84; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G97; PAPER NOT OTHERWISE PROVIDED FOR
17
Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
20
Macromolecular organic compounds
33
Synthetic macromolecular compounds
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
H
PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C, D21D84; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G97; PAPER NOT OTHERWISE PROVIDED FOR
19
Coated paper; Coating material
80
Paper comprising more than one coating
84
on both sides of the substrate
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
H
PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C, D21D84; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G97; PAPER NOT OTHERWISE PROVIDED FOR
21
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
50
characterised by form
56
Foam
CPC:
B32B 3/30
B32B 5/20
B32B 29/005
B32B 29/007
B32B 2250/26
B32B 2250/40
B32B 2255/102
B32B 2255/12
B32B 2255/26
B32B 2262/062
B32B 2262/067
B32B 2266/025
B32B 2307/30
B32B 2307/3065
B32B 2307/31
B32B 2307/718
B32B 2307/72
B32B 2307/7246
B32B 2439/00
B32B 2439/40
B32B 27/10
B65D 1/34
D21F 11/00
D21F 11/002
D21H 17/33
D21H 19/84
D21H 21/56
B31F 1/0077
C08J 9/16
C08J 9/228
D21H 21/22
Applicants: STORA ENSO OYJ
Inventors: RÄSÄNEN JARI
HILTUNEN MARI
HARLIN ALI
KOSKELA HANNA
LAINE CHRISTIANE
KELA LAURA
Priority Data: 2017050629 06.02.2017 IB
1650183 12.02.2016 SE
Title: (DE) VERFAHREN ZUR HERSTELLUNG VON PAPIER ODER PAPPE, PAPPSCHALE UND MIT SCHÄUMBAREM POLYMER BESCHICHTETE PULPEPARTIKEL ZUR VERWENDUNG DARIN
(EN) METHODS FOR MAKING PAPER OR BOARD, A BOARD TRAY AND PULP PARTICLES COATED WITH FOAMABLE POLYMER FOR USE IN THE SAME
(FR) PROCÉDÉS DE FABRICATION DE PAPIER OU DE CARTON, BARQUETTE EN CARTON, ET PARTICULES DE PÂTE ENROBÉES DE POLYMÈRE MOUSSANT À UTILISER DANS CES DERNIERS
Abstract:
(EN) The invention concerns a method of manufacturing paper or board, the paper or board obtained by the method, and a method of producing a tray from the board. In a fibrous stock for papermaking is incorporated an amount of polymer coated fibrous particles, which even have a foaming agent such as moisture contained therein. A web is formed from the fibrous stock on a forming fabric of a paper or board machine, followed by pressing and drying to a finished paper or board. As the paper or board is sufficiently heated the foaming agent within the particles evaporates, causing expansion and foaming of the polymer coating, which adds to malleability of the board as it is moulded into a shaped article such as a board tray. The invention even covers production of doubly coated fibrous particles for use in said methods, the inner coating layer being of a foamable polymer with a higher melt flow rate and the outer coating layer being of a non-foaming polymer of a lower melt flow rate.
(FR) L'invention concerne un procédé de fabrication de papier ou de carton, le papier ou le carton obtenu par ce procédé, et un procédé de fabrication d'une barquette à partir du carton. Dans une pâte fibreuse destinée à la fabrication de papier, est incorporée une certaine quantité de particules fibreuses revêtues de polymère, qui comportent également un agent moussant tel que l'humidité. Une bande est formée à partir de la pâte fibreuse sur une toile de formation d'une machine à papier ou à carton, après quoi un pressage et un séchage sont réalisés jusqu'à l'obtention d'un papier ou carton fini. Lorsque le papier ou le carton est suffisamment chauffé, l'agent moussant contenu dans les particules s'évapore, provoquant l'expansion et le moussage du revêtement polymère, ce qui ajoute à la malléabilité du carton lorsqu'il est moulé en un article façonné tel qu'une barquette en carton. L'invention concerne également la production de particules fibreuses à double revêtement destinées à être utilisées dans lesdits procédés, la couche de revêtement interne étant constituée d'un polymère expansible ayant un indice de fluidité à chaud plus élevé et la couche de revêtement externe étant un polymère non expansible d'un indice de fluidité à chaud plus faible.
Also published as:
CA3009875CN108473712WO/2017/137879