| 摘要 |
PROBLEM TO BE SOLVED: To obtain a nylon raw material excellent in characteristics for filtering paper, namely filtering property, compression restoration elasticity, surface property of paper and persistency of characteristics, namely abrasion resistance for giving durability to felt for papermaking, stain-proofing property and flatting resistance, etc., and matching with recent papermaking machine technique. SOLUTION: This felt raw material for papermaking a raw material is composed of a nylon raw material having >=80 mPa.s sulfuric acid solution viscosity (in JIS first grade 95% sulfuric acid of 0.25 g/50 ml) and modified so that the nylon raw material does not substantially leave residue behind in 85% formic acid solution. |
