Views: 0 Author: Site Editor Publish Time: 2020-10-26 Origin: Site
1. Alkaline problem
The pretreatment of cotton fabrics usually uses a higher concentration of alkali treatment to remove fabric impurities (especially the larger amount of fine silk alkali). It is not easy to wash alkali into the fiber, and dyeing (reactive vat dyes) also need to add alkali, so it may be added to the surface It is alkaline. The cleaning of chemical fiber fabrics is restored after dyeing. At present, printing and dyeing factories are still using sodium hydroxide and caustic soda to clean. If the back is not cleaned, it will also cause soft front cloth and alkali. Ordinary silicone oil is not alkali resistant and will break the milk under alkaline conditions. This is a sticky roller that appears after the factory has dried for several kilometers. Therefore, the surface of the soft front cloth must be cleaned with alkaline agent or added acetic acid to the working fluid to maintain the groove PH5-6.
On fabrics containing short fibers (cotton, T/R cloth, velvet), it is inevitable that some short fibers will fall off during processing, and the fabric will fall into the drain of short fibers and accumulate. Use ordinary silicone oil to produce one. The sticks are rolled up with finishing fluid and glued together with crushed condensed silicone oil to form a stick roll or silicon dot. Moreover, the water quality is relatively poor, and ordinary silicone oil will be used to condense to produce a sticky roller. In addition to the similar situation with fluffy fabrics, clean up before driving and find that the hair needs to be washed at any time.
3. Charge stability problem
Most of the dyes and whitening agents used in cotton are similar to the same child, while cotton whitening is basically done on the setting machine. In addition, dyed fabrics need to be fine-tuned and repaired when the color is not correct. The color repair is usually when a small amount of dye or paint is added to the soft finishing agent. The factory generally uses ordinary silicone oil (weak positive electricity) to produce a positive and negative charge attraction reaction, resulting in cohesion and The sticky rollers and the cationic silicon electronic body felt soft and did not meet the requirements, causing confusion in the factory. The charging consistency must be considered when handling.
The cloth dyed by the long cotton car must be dried in the oven, rolled or stacked in a cloth box. If the cooling is insufficient, especially the large cloth, the surface temperature of the soft fabric may be higher, resulting in an increase in the temperature of the working fluid of the pressure tank (especially It is summer), sometimes it reaches above 60 degrees Celsius, and the poor heat resistance of ordinary silicone oil can also cause the drum to be sticky. The temperature in the rolling groove does not exceed 40 degrees Celsius.