Biochemical Method Of Cotton Fabric With Super Soft Finish

In this subject, we mainly studied and discussed the method on cotton fabric's softness (comfort) finishing. We used biotic--chemical method, a super soft method which combines cellulase treatment with chemical softener finishing on cotton fabric. Through this means, we could improve cotton fabric's hand and comfort. Both of these two methods has advantage and disadvantage. If these two methods are combined together, they could make up each other-cellulase finishing could form a permanent softness and softener finishing could not only improve soft impression further but also reduce the strength loss made by cellulase's hydrolysis.In this experiment, we used Cellusoft L, which is a kind of cellulase made by Novozymes company, in cotton fabric's finishing. Finally, we found that we could obtain optimal effect at this condition: T =50, pH =5.0, bath ratio=l:20, enzyme =3%(owf), t =50min. Under this optimal condition of enzyme, we studied other factors which influence on enzyme: one factor was dyes existed previous. We selected three kinds dyes -direct, reactive, vat, and adopted two finishing methods: dyed first and then treated with cellulase, treated with cellulase first and then dyed. The former was used to find the effect on cellulase by the dyes, the later to find the influence on fabric's dyeability made by the cellulase treatment. The second factor was surfactant which could not be avoided in the fabric's finishing. We also selected three kinds of auxiliaries -anion, cation, nonionic surfactants. From each kind, we also selected several products which treated fabric with enzyme together and at last, we used weight loss rate to measure the influence on the enzyme made by the surfactants. We also studied the influence on enzyme's activity made by built-up product.In this experiment, we also found that the fabric's capability of absorbing volatilizing water treated by cellulase had been improved.We used different super soft finishing methods on the white and dyed fabric, studied the capability of the treated fabric and determined the best super soft process.After the fabric was finished, its hand was one important index evaluated and measured the fabric's quality, but how to evaluate the fabric's hand is a problem which hasnot been resolved. Here we would adopt a objective method to avoid those subjective influences, that was using fuzzing mathematics to evaluate the fabric's level. If we change the indexes into those characters which reflected fabric's comfortable capability, this model could also be used to evaluate the fabric's comfortable capability.