SHOE PRESS BELT FOR PAPERMAKING

摘要

The purpose of the present invention is to provide a shoe press belt which exhibits improvement in mechanical characteristics such as crack resistance, wear resistance, delamination resistance and bending fatigue resistance, particularly in the surface wear resistance of the shoe press belt and the crack resistance of the bottom regions of water receiving parts. A shoe press belt which is produced by integrating a reinforcing substrate with a polyurethane layer including at least a felt-side layer and in which water-receiving parts are formed in the felt-side layer, wherein the polyurethane equivalent value of the second resin layer including the bottom regions of the water-receiving parts is adjusted so as to be larger than that of the first resin layer including a surface which is to be brought into contact with a felt.

主权项

1. A papermaking shoe press belt, comprising:
at least a felt-side layer comprising a thermosetting polyurethane integrated with a reinforcing base material; wherein: in the felt-sided layer, water receiving parts are formed in the depth direction from the felt-side surface for receiving water squeezed from a wet paper web and a felt under a nip; the felt-side layer comprises at least a first resin layer comprising a felt-contacting surface and a second resin layer comprising bottom part regions of the water receiving parts; the first resin layer and the second resin layer are formed from a composition comprising a urethane prepolymer, the urethane prepolymer comprising a terminal isocyanate group and a curing agent, the curing agent comprising a terminal active hydrogen group; and the value of the equivalent ratio (H/NCO) of the active hydrogen group (H) of the curing agent to the isocyanate group (NCO) of the urethane prepolymer is higher in the second resin layer than the value of the equivalent ratio (H/NCO) of the active hydrogen group (H) of the curing agent to the isocyanate group (NCO) of the urethane prepolymer in the first resin layer.