Linen cotton fabric Common bleaching method

- Sep 20, 2018-

Scouring: When cotton fibers are grown, natural impurities (pectin, waxy substances, nitrogenous substances, etc.) are accompanied. After the desiccant of cotton Chinese linen cotton fabric manufacturers, most of the pulp and some natural impurities have been removed, but a small amount of slurry and most of the natural impurities remain in the Chinese linen cotton fabric manufacturer. The presence of these impurities makes the fabric of the cotton woven fabric yellower and has poor permeability. At the same time, due to the presence of cottonseed hulls, the appearance quality of cotton fabric is greatly affected. Therefore, Chinese linen cotton fabric manufacturers need to be scoured for a long time in high-temperature concentrated alkali to remove residual impurities. The scouring is the use of caustic soda and other scouring aids with pectin, waxy substances, nitrogenous substances, cottonseed hulls to undergo chemical degradation or emulsification, puffing, etc., after washing to make impurities from Chinese linen cotton fabric manufacturers Retired.

5) Bleaching: After the scouring of cotton Chinese linen cotton fabric manufacturers, due to the presence of natural pigments on the fibers, the appearance is not white enough for dyeing or printing, which will affect the vividness of the color. The purpose of bleaching is to remove the pigment, giving the manufacturer of Chinese linen and cotton fabrics the necessary and stable whiteness, while the fibers themselves are not significantly damaged. The bleaching methods commonly used by cotton Chinese linen cotton fabric manufacturers are sodium hypochlorite method, hydrogen peroxide method and sodium chlorite method. The pH of the bleaching solution of sodium hypochlorite bleaching is about 10, which is carried out at room temperature, the equipment is simple, the operation is convenient, and the cost is low, but the strength of the Chinese linen cotton fabric manufacturer is large and the whiteness is low. The bleaching solution of hydrogen peroxide bleaching has a pH of 10 and is bleached at high temperature. The bleached Chinese linen cotton fabric manufacturer has high whiteness and stability, good hand feeling, and can remove slurry and natural impurities. The disadvantage is that the equipment is demanding and the cost is high. Under appropriate conditions, combined with caustic soda, it can be desizing, scouring and bleaching once. The sodium chlorite bleaching bleaching liquid has a pH of 4 to 4.5 and is carried out at a high temperature. It has the advantages of good whiteness and small damage to fibers, but it is easy to produce toxic gases during bleaching, pollute the environment, corrode equipment, and equipment needs special Made of metal material, it is limited in application. Dechlorination should be carried out after bleaching of sodium hypochlorite and sodium chlorite to prevent the Chinese linen cotton fabric manufacturer from being damaged by the presence of residual chlorine in the presence of it.

6) Mercerizing: Mercerizing refers to the processing of cotton Chinese linen fabric manufacturers who use a concentrated caustic soda solution to improve the performance of Chinese linen cotton fabric manufacturers at room temperature or low temperature under tension in the warp and weft directions. . After mercerizing, the manufacturer of cotton Chinese linen cotton fabrics has a natural twist in the longitudinal direction of the fibers due to fiber expansion. The cross section is elliptical, and the reverse of light is more regular, thus enhancing the gloss. The increase in the invisible zone of the fiber increases the dye uptake rate during dyeing. The increase in the degree of orientation has led to a strong increase in the manufacturer of Chinese linen and cotton fabrics, as well as a shaping effect. After mercerizing, it is necessary to use alkali to remove alkali or steamer to remove alkali, or to wash alkali to remove alkali, until the manufacturer of Chinese linen cotton fabric is neutral.

2. Dyeing dyeing is a process in which a dye or a fiber is physically or chemically combined, or a pigment is chemically formed on a fiber to impart a certain color to the entire textile. Dyeing is carried out under conditions of temperature, time, pH and the desired dyeing aid. The dyed product should have a uniform color and good dye fastness. The dyeing methods of Chinese linen cotton fabric manufacturers are mainly divided into dip dyeing and padding. Dip dyeing is a method in which the manufacturer of Chinese linen cotton fabrics is immersed in the dye liquor and the dyes are gradually dyed to the manufacturer of Chinese linen cotton fabrics. It is suitable for small batch and multi-species dyeing. Rope dyeing and dyeing all fall into this category. The padding process is to first immerse the Chinese linen cotton fabric manufacturer in the dyeing liquid, and then let the Chinese linen cotton fabric manufacturer roll the dye liquor evenly into the Chinese linen cotton fabric manufacturer, and then steam or hot melt. The dyeing method of the treatment. It is suitable for the dyeing of large quantities of Chinese linen cotton fabric manufacturers.

Third, printing

The printing is carried out by means of the carrier of the original paste, and various dyes or pigments are printed on the Chinese linen cotton fabric manufacturer to obtain a colored pattern processing process. Printing and dyeing are all about coloring Chinese linen and cotton fabric manufacturers. However, during the dyeing process, the dyes make the process of the entire fully colored pattern of the Chinese linen cotton fabric manufacturer. Printing and dyeing are all about coloring Chinese linen and cotton fabric manufacturers. However, during the dyeing process, the dyes have made the Chinese linen cotton fabric manufacturer fully pigmented, and the printing is only the dyeing of certain parts of the Chinese linen cotton fabric manufacturer. In order to overcome the percolation of the dyeing liquid, various clear patterns are obtained. When printing, the dye and the necessary chemical additives are added to the original paste to be colored paste, and then printed on the Chinese linen cotton fabric manufacturer. The original paste is a thick fluid prepared by using a paste such as starch. Due to the presence of the paste, the dyeing process of the dye in the color paste is more complicated than the dyeing process of the paste preparation surface such as dyeing.

Chinese linen cotton fabric manufacturer printing first needs pattern design. According to the printing equipment, the drum printing and the screen printing are respectively carried out by the flower cylinder engraving and the screen printing. The flower tube engraving is to engrave the pattern on the copper flower tube. The pattern is concave on the flower tube. The concave lines are evenly covered with diagonal lines or dots to store the printing paste. When printing, under the action of pressure, the printing paste is transferred. To the Chinese linen cotton fabric manufacturer. Screen plate making is lithographic screen making and round screen making. The stencil screen is made of polyester yarn or nylon yarn. The round mesh is made of nickel mesh. The mesh of the non-pattern part is closed, leaving the mesh of the pattern part. When printing, the color paste overflows from the mesh and is printed on the Chinese linen cotton fabric manufacturer. .

According to different printing processes, Chinese linen cotton fabric manufacturers have direct printing and anti-dye printing, which are first printed and dyed, and the printing paste contains anti-dyeing agent to prevent dyeing dyeing. The dyeing printing is dyed first, then printed, and the printing paste contains a dyeing agent that destroys the ground color dye. Cotton Chinese linen cotton fabric manufacturers generally use direct printing, the main process is:

Pattern design-→carton carving (or screen plate making)--

Modulation paste - - → printing - → drying - → steaming - → flat wash - → drying.