Crown Zellerbach Corporation

Ronald E Hostetler

David D Hulit

Horace Hamby, Iii

A system for producing a bulky, soft and absorbent paper web wherein the web is directed through a first nip formed by two dewatering felts, a second nip formed between a dewatering felt and an imprinting fabric of a specified character, and a third nip formed between the imprinting fabric and creping surface.

Tri-nip papermaking system

A system for producing a bulky, soft and absorbent paper web wherein the web is creped from a first creping surface, passes through a nip formed between a dewatering felt and imprinting fabric of a specified character and is applied to and creped from a second creping surface.

High bulk papermaking system

A bulky, soft and absorbent creped paper web is manufactured by supporting an uncompacted wet web of principally lignocellulosic fibers on an imprinting fabric having compaction elements, for example knuckles formed at the warp and weft crossover points of the filaments of an open mesh fabric. The imprinting fabric has a surface void volume of from about 15 cc/m.sup.2 to about 250 cc/m.sup.2, preferably from about 40 cc/m.sup.2 to about 150 cc/m.sup.2, and a compaction element contact area constituting from about 5% to about 50%, preferably from about 20% to about 35%, of the total surface of the imprinting fabric. The web is selectively mechanically dewatered or pre-dried by passing the web through a first compression nip formed between the imprinting fabric and a dewatering felt at a pressure in a range from about 20 pli to about 600 pli so that significant compacting of the web occurs in the vicinity of the compaction elements. The selectively mechanically dewatered or pre-dried web is removed from the imprinting fabric after it passes the first compression nip and the web is then finally dried. According to a preferred embodiment, web removal is accomplished by applying the pre-dried web to a creping surface at a second compression nip formed between the creping surface and the imprinting fabric. The web remains essentially undisturbed on the imprinting fabric as it is transported between the first and second compression nips so that the fabric compaction elements contact essentially the same portions of the web at the second compression nip that were contacted at the first compression nip. The web is then thermally dried, creped and removed from the creping surface.

Growing community of inventors

Vancouver, WA, United States of America

Ronald E Hostetler