Patent ID: 8986506
Filing Date: 2015-03-24
Classification: B29C,D21F,D21G,Y10S,Y10T

Abstract:
1. A shoe press belt which is an independent piece with a shape of an endless loop, runnable in a shoe press through a long nip between at least one roll and a press shoe, the shoe press belt comprising: a base which is of an elastomeric heat-resistant material; a plurality of polymeric support yarns arranged in at least one yarn layer inside the base; and a first surface on the side of the press shoe, and a second surface on the side of a fibre web, wherein at least some of the support yarns are heat-resistant polymer yarns, the polymer structure of the material of which comprises a naphthalene group, wherein the structure of said heat-resistant polymer yarn comprises completely aromatic liquid crystalline polymer, the completely aromatic liquid crystalline polymer being poly(4-hydroxybenzoic acid-co-6-hydroxy-2-naphthoic acid) and the glass transition temperature Tg of said polymer material is at least 110° C., wherein the shoe press belt is impermeable, and wherein the force required for a 2-% stretch of said heat-resistant polymer yarn is at least 10 cN/tex, 20° C.