Experts Explain How To Eliminate Defects In Dyeing Cloth Production.

Common defects: the influence of wax and hetero yarn on dyeing

Experts: because of the uneven quality of grey cloth, the sizes used in each weaving mill are different, so there are problems in dyeing, such as cloth flowers, serious white stars, shadow weight of fine spinning cloth. In particular, some small textile mills produce grey cloth with paraffin wax, which causes serious wax phenomenon in dyeing production. dyeing Cloth noodles, flowers and white spots are serious (especially in Blue Series). Therefore, before testing, if the wax content is too much, it is necessary to remove wax first. If the wax strip can be widened before mercerizing, softener is used before mercerizing. If the wax strip is found before dyeing, the waxy agent can be used first, and then it can be dyed after drying.

When dyed dark dyed cotton fabric, sometimes it is found that there are more white stars in the fabric and it is fluorescent under the ultraviolet light. This is caused by the foreign yarn. So if we know that the yarn of the grey cloth should be re boiled after the roasting of the yarn, if it is found that the yarn should be dyed before baking, then if the yarn is dyed, the yarn will affect the color light if the yarn is heavier.

Common defects: formation and prevention of dirty gas during dyeing

Expert weapon: we often produce orange, bright and other special colourful colors in the production of colored cloth, and we will use fluorescent materials to produce. However, we will find that there is a layer of black gas on the surface of the cloth, which makes the cloth look special. This is the dirty gas. Usually, the pollution is caused by the following situations:

Not singeing. If the singeing effect is poor, the cloth will be left with a short layer of fluff. When the dye is produced, the infrared ray of the bottom machine is too close to the cloth and the speed of the vehicle is slow. The production of dark color cloth is not obvious, and the production of bright colors will be more obvious.

Improper material selection results in black air. If the dispersant in production is selected as fluorescent material, and the active material is selected with darker dye, it will cause a black layer of foul air due to the inconsistency of color and light. Polyester and cotton fabrics have higher brightness and brightness than those of cotton. When polyester and cotton are dyed with special colourful colors, it is easy to cause color difference. Therefore, when producing bright colors, cotton processing should be strengthened to ensure fabric whiteness, so that the color of polyester and cotton is basically the same, so as to prevent the production of dirty gas.

Improper formulation of dyeing process. For example, we choose disperse fluorescent red, disperse Fluorescent Pink and disperse purple to produce bright powder. If the baking temperature is low, the fabric is darker and darker after dyeing, but when the baking temperature is high, the fabric will be bright and full after dyeing. At this time, the high temperature of disperse red fluorescence can give full color to the beautiful fluorescent effect. Therefore, the reasonable production process should be made according to the selected dyes so as to produce bright colored cloth.

Common defects: Causes and prevention of rotten cotton stains and holes

Expert weapon: rotten cotton patch defects usually form in the process of oxygen bleaching. If drifting is practiced, floating liquid contains rust and other impurities adhered to the surface of the fabric. Under the action of metal ions, hydrogen peroxide will decompose violently and cause a lot of heat to damage the cotton fibers. The fiber damage in the tracked steamer will form rotten cotton spots or holes when it is placed at high temperature for a long time. In addition, when burned, the cloth will be charred. Cotton wool Adhering to the surface of the fabric will form a burn point here. When oxygen bleaching occurs, it will also cause burn cotton spots due to the severe reaction of hydrogen peroxide.

Rotten cotton stains have a great effect on dyeing quality. When bright colors are found, bright spots are formed on the rotten cotton spots. Dark spots are formed on the rotten cotton spots when dark and dark are stained. For polyester cotton fabric, the weight of rotten cotton spots depends on the color difference between polyester fiber and cotton fiber. When the color is close, the stain will be reduced, and the stain will increase when the color difference is large. Therefore, if we find the stains formed by rotten cotton stains, we should adjust the color consistency of the cotton and cotton as far as possible, lighten the difference of the gloss of the polyester cotton fabric, and minimize the influence of the quality of the rotten cotton spot color cloth.

If stained cotton spots are found during dyeing, the drifting workers should be notified as soon as possible to minimize the loss and adjust the prescription to reduce the degree of rotten cotton stains. According to the cause of the formation of rotten cotton spots, the following measures can generally be taken to prevent:

The container for bleaching liquid should be clean, and can not contain metal impurities such as rust. The soft water used should also be clean and not contaminated by rust water pipes for the two time. In addition, oxygen bleaching cloth can not have rust spots, rust spots should be treated first before oxygen bleaching.

The oxygen bleaching process should be safe, reliable and tolerant. The auxiliaries (stabilizer, penetrant, chelating dispersant, water glass, etc.) are reasonable and reasonable to prevent hydrogen peroxide from drastic reaction to form holes or rotten cotton stains. The content of hydrogen peroxide in thin fabrics should be lower.

Wet bleaching should be used when oxygen bleaching is used to prevent rusty spot or overburning point react with hydrogen peroxide. Wet cloth can also compensate for fabric penetration and whiteness inconsistency due to technological fluctuations.

　　 Grey When the quality is poor, the neps and dead cotton will be more frequent and the customers will usually ask for neps. In the production of the sanding machine, due to the influence of the wind brush roller and other factors, the cotton cloth can be attached to different degrees. If the bristle box is not thoroughly treated, the cotton wool will accumulate more and more and will be carried to the fire. The cotton wool ashes will cause burning spots and black spots. This carbonized cotton wool ash will react violently with hydrogen peroxide when oxygen bleaching, causing the fabric to form rotten cotton stains. Therefore, we should pay attention to the production of NEP knitted fabric: the effect of a brushing machine is better. The cotton wool can not be fluttering everywhere and glued to the cloth surface. When we burn the wool, we should pay attention to cleaning the brush box, and eliminate the possibility of forming cotton wool ashes from the cotton wool to the fire.