Process for pre-treating fabrics by bio-enzymatic method

Abstract

The invention relates to a pretreatment process of fabrics in the printing and dyeing industry, and in particular relates to a process for pre-treating fabrics by a bio-enzymatic method. The method comprises the following steps: padding for the first time; carrying out a cold pad-batch process on the fabrics; sequentially washing with hot water and cold water, and squeezing; padding for the second time; steaming the fabrics; and washing with hot water, then washing with cold water once and drying, wherein, a complex enzyme system is added in the procedure of padding for the first time, and the complex enzyme system comprises alkali pectinase, amylase and lignin degrading enzyme systems. By utilizing the process, the biological enzyme is added to the fabrics for synchronously desizing, refining and bleaching the fabrics; the process has the advantages of moderate action conditions, no damage on the fabrics, energy loss reduction and environmental friendliness; and the wettability, impurity removal rate and whiteness of the obtained fabrics are much higher than those of the fabrics obtained through alkali treatment.

Description

technical field [0001] The invention relates to a fabric pretreatment process in the printing and dyeing industry, in particular to a fabric pretreatment process using a biological enzyme method. Background technique [0002] In the printing and dyeing process, the traditional pretreatment of cotton fabrics generally adopts the following steps: desizing, scouring, and bleaching. Adopt above-mentioned method to process cotton fabric, the amount of water, electricity, steam is all very big. In the traditional process, alkali is used for desizing, and impurities such as pectin, wax and protein are saponified and emulsified under high temperature and high pressure conditions to remove them from the fiber. The use of strong alkali to desizing has the following disadvantages: the sizing on the warp must be desized, so that the dyes and fibers can fully contact and reduce the consumption of dyes. Most printing and dyeing manufacturers use alkali desizing to remove the size on th...

AI Technical Summary

Problems solved by technology

The use of strong alkali for desizing has the following disadvantages: the sizing on the warp must be desized, so that the dyeing material can fully contact the fiber and reduce the consumption of dyeing material

Another major disadvantage of alkali desizing is that it is difficult to control the water washing after desizing. Alkali desizing cannot destroy the macromolecules of the size. If the water washing is not sufficient, it is easy to re-contaminate the size and reduce the desizing effect.

[0003] The high-temperature bleaching process is generally used in the prior art. The disadvantages of this method are: 1. High energy consumption during the processing, and the bleaching temperature of hydrogen peroxide is above 98°C; Iron ions or other heavy metal ions, the damage will be more serious; 3. The fabric is more degreased, which affects the natural lubricity of the fiber, resulting in a rough feel of the fabric and easy pilling

[0004] Due to the extensive use of chemicals in the traditional process, the COD value in the wastewater is too high, and the sewage treatment is difficult, which does not meet the requirements of today's environmental protection processing.