Peel pack paper

Details Peel pack paper Peel pack paper

D - Textiles, Paper

21

H

D21H 11/04 (2006.01) D21H 19/20 (2006.01) D21H 11/12 (2006.01) D21H 13/08 (2006.01) D21H 13/24 (2006.01) D21H 13/26 (2006.01) D21H 25/06 (2006.01)

Patent

CA 2271389

Disclosed is a peel pack paper having a Gurley porosity of greater than 20 seconds/sheet. The paper includes a) from about 45 to about 65 %, by weight, of substantially fully bleached eucalyptus Kraft pulp fibers; b) from about 10 to about 45 %, by weight, of a blend of substantially fully bleached softwood Kraft pulp fibers and substantially fully bleached hardwood Kraft pulp fibers wherein the softwood Kraft pulp fibers comprise at least 90 %, by weight, of the blend; and c) from about 10 to about 30 %, by weight, of reinforcing fibers. Importantly, substantially all of the fibers of the paper are coated with a dielectric material with the coating having an average thickness of less than 1 micron. In some embodiments, the coated paper is subjected to an electret treatment to instill a charge in the dielectric material.

La présente invention concerne un papier d'emballage décollable caractérisé par un indice de porosité Gurley supérieur à 20 secondes par feuille. Ce papier se compose (a) pour environ 45 % à environ 65 % de sa masse de fibres de pâte kraft d'eucalyptus sensiblement totalement blanchie; (b) pour environ 10 % à environ 45 % de sa masse d'un mélange de fibres de pâte kraft de résineux sensiblement totalement blanchie et de fibres de pâte kraft de feuillus sensiblement totalement blanchie, mélange dans lequel fibres de pâte kraft de feuillus représentent environ 90 % de la masse; et (c) d'environ 10 % à environ 30 % de sa masse de fibres de renforcement. Ce qui est primordial, c'est que sensiblement la totalité des fibres du papier sont revêtues d'une épaisseur de matière diélectrique inférieure à 1 µm. Selon certaines réalisations, on soumet le papier couché à un traitement électret destiné à instiller une charge dans la matière diélectrique.

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