Filter paper that disintegrates quickly in water

摘要

The invention relates to a paper that disintegrates quickly in water, for use as a filter material or filter wrapper paper of a cigarette filter. At least 80 wt % of the paper is formed by cellulose fibers. Of the cellulose fibers, at least 80 wt % are a mixture of long fiber pulp and mercerized pulp. 0 to 90 wt % of the content of the mixture is formed by mercerized pulp, and the rest is formed by long fiber pulp. The cellulose fibers of the mixture have a freeness of at most 30° SR according to ISO 5267. In the disintegration test using an apparatus as described in TAPPI T 261, the paper exhibits a disintegration of at least 60% after 30 seconds.

主权项

1. A paper that disintegrates quickly in water for use as a cellulose acetate free filter material or filter wrapper paper of a cigarette filter, with the following properties:
at least 90% by weight of the paper is formed by pulp fibers, of said pulp fibers, at least 80% by weight consists of a mixture of long fiber pulp and mercerized pulp, wherein the mean fiber length of the long fiber pulp is more than 2 mm, and wherein the long fiber pulp is derived from coniferous wood, wherein 0 to 90% by weight of said mixture consists of mercerized pulp and the rest of long fiber pulp, wherein the pulp fibers of said mixture have a freeness determined according to ISO 5267 of at most 20° SR, wherein in a disintegration test using an apparatus described in TAPPI T 261, the paper exhibits a disintegration of at least 60% after 30 seconds, wherein the paper has a breaking strength according to ISO 1924 of at least 9 N/15 mm, and wherein the paper has a basis weight of 10 to 50 g/m2.