Cylinder drying technology in open-width dyeing of cotton knits
In order to optimize the ylingder drying process and reduce the color difference between the front and back of the fabric,four kinds of pad-dyeing process are designed for pure cotton rib fabric dyeing.According to the apparent color depth of the fabric,the optimum process of pad-dry-cure is obtained.In the cylinder drying process,low temperature drying should be adopted first.When the pick-up rate of the fabric drops to a certain degree,the fabric should be dried by stepwise heating method.The interval between the front and back of the fabric contact with the cylinder should be controlled appropriate below 20 s,and the best color fixing effect is achieved when the pick-up is about 30％.For lightweight knitted fabrics,in addition to reducing the initial drying temperature,the speed should be increased to speed up the cylinder transmission speed and improve the evenness of fabric surface.
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