| 摘要 |
<p>A papermaker's fabric, for example a dryer felt, a wet felt, or a forming wire screen fabric, comprises a plurality of crosswise yarns (12) disposed in a plurality of separate layers, each of which lies in a plane parallel to the crosswise plane of the fabric, and a plurality of lengthwise yarns (14) interwoven with the crosswise yarns (12) to bind the layers of crosswise yarns (12) together to form a multilayer fabric. Structurally, the crosswise yarns (12) in a given layer are separated from the adjacent crosswise yarns (12) in adjacent layers at points along their length by void spaces (16) within the body of the woven fabric, and these voids (16) determine the permeability of the fabric. The invention proposes to control the void volume of a papermaker's fabric, hence controlling its permeability, by at least partly filling the voids (16) with a synthetic, polymeric, thermoplastic resin, cellular foam (22). Preferably the foam is introduced by weaving into the fabric structure a plurality of stuffer yarns (18) which have been coated with a a foam forming composition (20), and then causing the composition (20) to foam in situ in the fabric. </p> |
