In the washing and dyeing process of denim products, once the loss of ammunition caused by the degradation of spandex is basically irreparable, so it is necessary to do a good job of sample before production to ensure that there will be no quality problems in mass production. According to the physical and chemical properties of polyurethane fiber, elastic denim products containing spandex may lose ammunition in the process of water washing. It is mainly due to the improper process formula or operation in the process of water washing, which leads to the breakage and dissolution of spandex and finally causes the loss of ammunition.

During the bleaching process, because spandex is not resistant to chlorine bleach, it will form a nitrogen-chlorine combination in the hypochlorite solution and cause fiber damage, and the damage of polyether spandex is more serious. When the water temperature in the cylinder is too high or the time is too long, the spandex will degrade and cause the fabric to lose elasticity. So how to avoid missing bullets in the rinsing process?

(1) Conduct pre-production testing;

(2) In production, the drift water must be deployed before it can be injected into the cylinder, and direct feeding is prohibited;

(3) The floating water must be added under the rotating condition of the equipment to prevent the local concentration is too high to cause ammunition loss;

(4) When the residual drift water is dried on the clothes at high temperature, the chlorine will release and cause the degradation of spandex. Pay attention to the cleaning work after bleaching;

(5) Strengthen the personnel management of online work, monitor the production status, and prevent quality problems caused by processing temperature or time exceeding the process requirements.

Many people, faced with such a high risk of misfiring, ask, is there a better solution for rinsing to prevent misfiring? The answer is yes, of course, Novozymes cold bleaching enzyme solution can completely solve the problem of elastic loss in the bleaching process, because the cold bleaching enzyme only works on the color of indigo and plays a bleaching role, without any damage to other fibers, which is very suitable for the bleaching of fabrics that are easily elastic.