| 摘要 |
PURPOSE:To bleach a composite raw material composed of a protein fiber and/or protein acrylonitrile copolymer fiber and a natural cellulose fiber while preventing the discoloration, embrittlement, etc., of the protein fiber by treating the composite raw material with an alkaline solution of an oxidizing bleaching agent and subjecting the treated material to washing with water, neutralization and washing with hot water. CONSTITUTION:A composite raw material composed of a protein fiber and/or a protein acrylonitrile copolymer fiber and a natural cellulose fiber is bleached by (1) treating the material with an alkaline solution of an oxidizing bleaching agent such as a peroxide, peracetic acid or their mixture at a low temperature (e.g., normal temperature) to prevent the damage of the protein fiber and the protein acrylonitrile copolymer fiber and (2) washing the treated cloth with water, neutralizing with an acid and finally washing with hot water. The natural cellulose fiber constituting the composite raw material can be bleached by this process. |
