A necessary process for printing, dyeing and finishing woven fabrics is characterization. Styling has strict requirements on temperature and speed, and it is also necessary to prevent fabric discoloration, shrinkage and other possible problems. Styling woven fabrics is also a science. Fabrics with different compositions have different process parameters. You must master these basic common sense when selling fabrics. Next, Cao Lin, editor-in-chief of Printing and Dyeing Learning and Exchange, briefly describes the characteristics of dyeing, finishing and shaping of woven fabrics according to the classification of raw materials.
1. Shaping of nylon woven fabrics
1. Setting temperature: 160℃-180℃. Speed: 20M-25M/min.
2. The color of the setting temperature changes greatly, especially purple, pink blue, etc., so pay attention to whether the color after setting is the same as that before setting.
3. The thickness and shrinkage rate of nylon fabrics are also different.
4. Nylon fabrics are easy to hook when setting. If there is a thread hooking all the way through the shaping, stop the machine immediately, check the nose and tail of the machine, the bellows, and the drum, and polish them with sandpaper. Or doily. (Such as stockings cloth, mesh cloth).
2. Shaping of polyester woven fabrics
1. Shaping temperature : 170℃-200℃, speed: 20M-28M/min.
2. The setting temperature of polyester generally does not change much, but the sublimation fastness of red dye is not good. The dye will be left on the chassis after finishing, so light colors cannot be made immediately. To make black, you can also use scrap cloth and machine it several times to make light colors.
3. The shrinkage rate of polyester stretch fabric is very large. If the customer requires good elasticity, small shrinkage and good hand feel, the blank fabric must be pre-determined, paying special attention to the black and white. For red and white flowers, due to the poor sublimation fastness of the dye, the finished product must be set at a low temperature. If the temperature is high, the product will be seriously stained.
4. When shaping the polyester poppy fabric, pay attention to the thickness of the center and edges of the fabric. The temperature should be well controlled and not too high. Slow down the machine speed and pull in two steps. Setting it twice can reduce the difference in thickness between the center and the edge. When setting it twice, the door width is about 6-8 inches less than the finished product, and the weight is about 100g. The second time the temperature is 5-10 degrees lower than the second time, the width and weight are as required.
3. Shaping of cotton rayon woven fabric
1. Setting temperature: 160℃-190℃, speed: 20M-30M/min
2. If the cotton cloth is dyed with direct dye, the cold and hot color of the embryonic cloth will change greatly, and the color matching will be certain. You have to wait until the gray cloth is completely cooled before processing, as the active material will not change much.
3. Rayon fabrics are prone to aging at high temperatures, and burnt fabrics are prone to snagging and tearing.
4. The shrinkage rate of cotton is very large. When setting the shape, the cloth feeding tension should be reduced, the pressing pressure should be increased, the cloth should be pressed dry, and the hot air blower should be turned on to high. Slowing the speed can reduce the shrinkage rate. If the customer’s requirements are high, shrinkage testing is required.
5. If the customer requires that the fabric surface be untwisted, it must be shaped in a twill pattern.
4. Shaping of silk woven fabrics
1. Shaping Temperature 100℃-120℃, speed: 20M-30M/min
2. Turn down the hot air for silk shaping and make the door width smooth.
3. Silk is relatively delicate. Do not get water or sweat when styling, and do not use too much force when pulling the cloth.
5. Shaping of PU glue fabrics
1. Imported pulp , no discoloration at high temperatures, 140℃-180℃. Speed 25M-30M//min, strong air.
2. Domestic pulp is easy to change color at high temperatures, 140℃-180℃, speed 25M-30M/min, strong air.
6. The shaping of woven fabrics must meet the requirements of weight and width
1. Before finalizing, be sure to measure the weight and door width. If it is too far from the requirements, you must report it in time and follow the order.
2. When setting the shape, pay attention to the difference between the middle and the sides of the weight, and the difference between the weight and the weight should not be too far.
3. When finalizing, pay attention to whether the front, middle and back of the door width of the cloth are the same. </p
