3.What are the treatment measures for the stain?
There are many reasons for the formation of white spots, such as the water point of the dyeing machine, and the reduction of the water point of the steam box. If the water points in these places are produced in the front position, the lower water points will be generated from the lower position. The water point is more than the circle in the higher difference of the route, or splash, the water point has a long strip line of the high difference. There are also white spots such as a mercerizing machine that has woven bag strips that cause white spots when dyed here. Dark spots are formed when a mercerizing machine has a cotton wool that causes the dye to be stained. Other causes of white spots are waxy, alkaline mud, and poor cotton spots.
In the production, if the grey cloth is good, the dyeing rate of dyeing is good, and the cloth is smooth and smooth. The grey cloth quality is poor, and the dyed white star and cloth strip are serious. Thus encounter with death manifolds of mian fabric, must strengthen the pretreatment process, while ensure production safety and reliability, as far as possible will clean cotton mixed processing, will die cotton cooked, to improve the dyeing rate and dyeing cloth product quality.
Cold pretreatment pile fabric due to energy saving, so now there are a lot of enterprises in the application, but cold heap remove cotton hybrid and pulp effect is poor, the cloth is harden, so dyeing easily folds, and fabric guide rod is easy to dirty, dirty spots when dyeing production so add less viscous additives, such as: the migration agent, brightener NT - 2, etc.
Production of polyester/cotton mill wool fabric or the thick fabrics such as cotton, if floating production practice poor result in cotton cleaning effect of cleaning not net, some small cotton stick on the cloth, more difficult to remove after rolling, rolling car will form a white spot in dyeing. Some white spots stain the bottom of the machine is not obvious, but if use the hand to reverse the cloth noodles, the cotton wool fall down will see a lot of white spots. And small cotton sticks on the cloth is very difficult to remove, continuous plane dyeing are hard to find, but when you need to add stenter anti-wrinkle, waterproof agent, crosslink agent, such as viscous additives when stick cotton down and show white spot. So vitiligo be reckoned caused by cotton, hair in the production of grinding products, should pay attention to regular cleaning ram MAO machine, exhaust fan, interlock brush roller, in order to prevent the adhesion on the cloth by the cloth mill rolling hard to wash car. If you don't net after both sides cotton cleaning or washing, can on the ground with brush roller brush again on MAO, dyeing cotton again you'll do for cotton processing more miscellaneous, dead cotton fabric, during mercerizing alkali concentration (220 g/L) can effectively improve the quality of cloth cloth cover, reduce white and article on the flowers.
Grinding wool fabric after grinding wool production must pay attention to the aurora, because once the aurora print, can form when dyeing white spot, grinded so mercerizing alkali cleaning and fabric guide rod rolling car can't with hard objects, frequently and carry out inspection, aurora to print white spot should be at the dyeing processing before dyeing. My company produces polyester cotton mill wool fabric dyeing, two bath process disperse/reactive dyes have encountered, white spot at the production of disperse dyeing not enough attention, until set of dye reactive, it found that white spot heavy thoughts. To deal with only with wool grinding mill fleece aurora seal effect at the expense of MAO, the higher alkali mercerizing again, make the aurora printed cloth with MAO outside aurora place, caused by such aurora printing dyeing white spot appeared no longer.
4. How to deal with the pleats?
Expert tips: when stained, you will see a double or multi-channel black tucks on the surface of the cloth, and the black pleats next to the black pleats. This pleated roasting will show a white streak, which will be a deep black fold after the color has been restored. Because singeing, singeing is wrinkled when cloth uneven through cloth folds, crater due to high temperature in the crater where will form a cleft formed by scald, because not to burn in a crease, so black cleft side with white wool top.
To prevent the emergence of singeing folds, singeing first when not out wrinkled and formulate reasonable production technology, and according to the different fabric for the thick fabric should heap or boil again after singeing, singeing, cloth into the room to reduce the possibility of singeing catch a cleft, moreover is singeing using wet cloth, in order to prevent the high off temperature intensifies the formation of a cleft.
If it is found that there are pleats, it must be processed and then dyed again. Once driving, the black fold will not be processed after dyeing. It is easy to fix the pleating of the pleats, as long as the high temperature finalize the cloth and then flatten the cloth and then lower the base silt to remove the pleated hair.
5.How to deal with caterpillar seal?
Experts recommend that tracked more usually appeared in the thick fabric, printed in dyeing with caterpillar but due to the formation of different form, so after dyeing on the fabric display forms are not the same as (black and white printing). Usually everyone see the crawler seal is zonal messy black rail, the caterpillar is caused by caterpillar box fabric played too thick pile of indentation, sometimes if the lighter can need not consider crawler seal, dyeing board should not be too obvious. If the pleats are too obvious, you can remove them as long as the hot pile is rewashed. But another kind of white stripe caterpillar print production may be rare, it is not clear why it is a caterpillar.
As is known to all, for the sake of production safety drift crawler box adopts saturated steam, cook by overheating steam heating crawler box water in the tank to produce saturated steam to deal with the fabric, but if the treads in the water level is too low, caterpillar box will be filled with 240 ℃ high temperature superheated steam, the crawler plate (roll) will temperature is too high to keep dyed fabric contact burns to form a white streak, and stacking time long white streak is heavier, once the equipment white streak will be difficult to repair the machine malfunction, so the white streak is tracked, can be classified as it tracks. This kind of white stripe caterpillar seal once formed is very difficult to get rid of, the car driver should pay attention to the pile configuration, thickness, water level (neither water table nor water tank).
What if the stain is found in the stain? First of all, this kind of track seal must be repaired. Since this spot is caused by track, then use boiled floating track box to re-work effect is certainly not good, so the recommended hot alkaline process, and then concentrated alkali mercerization in order to improve the dyeing rate in burns in penetration. After the repair, heavy crawler printing still appears in white, the workers can only improve the dyeing process to compensate.
For lighter crawler seals, it can be used to extend the leaching time to reduce the caterpillar seal by using two leaching or pressing roller in the feeding trough.
For heavy crawler prints, we will use two bath methods to stain, first dyeing and dyeing with 50% of the dye, and then dyeing it again can obviously improve the performance of the crawler to achieve customer satisfaction. For specially heavy crawler prints, if the goods are bleached, they can be bleached, otherwise only the dye can be dyed to maximize the performance of the crawler.