Board, a method of manufacturing the same and a container...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 21/22 (2006.01) B32B 27/10 (2006.01) B65D 3/28 (2006.01) B65D 81/38 (2006.01) D21H 17/33 (2006.01) D21H 21/56 (2006.01)

Patent

CA 2681033

The invention relates to a method of manufacturing board (2), a board provided by the method, and a container formed from the same, such as a disposable drinking cup. According to the invention, fibre-based stock is doped with a polymer (6), ending in a pulp web that is formed of this pulp on a board machine wire, and in a board layer (3) that is obtained from the same by pressing and drying. When the board layer is heated, the polymer melts and water vapour bubbles penetrate it, rendering the layer porous. The polymer used for the doping can comprise, for example, a low density polyethylene (LDPE) that has a melt viscosity of about 15. Pore-generating heating can be carried out for the board or only for the container manufactured from it. The porous layer prevents the hot drink enjoyed from the cup from burning the fingers of the user.

La présente invention concerne un procédé de fabrication de carton (2), un carton fabriqué à l'aide dudit procédé et un récipient formé à partir dudit carton, tel qu'un gobelet jetable. Le procédé selon l'invention consiste : à doper une composition à base de fibres avec un polymère (6); à former, sur une table plate de machine à carton, une bande de pâte à partir de ladite pâte; et à produire une couche de carton (3) à partir de ladite bande de pâte par pressage et séchage. Lorsque la couche de carton est chauffée, le polymère fond et des bulles de vapeur d'eau s'y introduisent, ce qui rend la couche poreuse. Le polymère servant au dopage peut contenir par exemple un polyéthylène basse densité (LDPE) présentant une viscosité à l'état fondu d'environ 15. Le chauffage générant des pores peut être effectué pour le carton ou uniquement pour le récipient fabriqué à partir dudit carton. La couche poreuse empêche la boisson chaude contenue dans le gobelet de brûler les doigts de l'utilisateur.

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