EFFECTS OF PHOSPHATES AND SILICATES ON THE RAW SILK

The samples used are cocoon shells resulting from the reeling of raw silk as a by-product. Effects of condensed phosphates in preparing and finishing processes of the materials on fermentative degumming are ascertained.The result obtained are as follows:1) In eliminating oily substances from the materials, pyrophosphates acts as an effective agent.2) As regards the loss percentage of the materials, sodium metasilicate shows the most remarkable result; pyrophosphate medium and metaphosphate glass (so-called hexametaphosphate) the least.3) When much pyrophosphate is used, the finished articles present white appearance.4) The most favorable feel of the finished articles can be obtained by soap treatment. Treatment with sodium metasilicate or with metaphosphate glase does not give desirable result, leaving rough feel of the finished articles.