In the process of dyeing and dyeing denim products, once the loss of elasticity occurs due to degradation of spandex, it cannot be repaired. Therefore, the pre-production sample must be prepared to ensure that no quality problems occur during large-scale production. According to the physical and chemical properties of polyurethane fibers , Spandex-containing elastic denim products cause inelasticity in the process of washing water, mainly due to process formulas or improper operation in washing water processing, resulting in spandex breakage, dissolution and other phenomena, and ultimately causing inelasticity.
During the rinsing process, due to spandex-resistant chlorine bleach, nitrogen-chlorine bonds are formed in the hypochlorite solution to damage the fibers, and polyether-spandex is more severely damaged. When the water temperature in the cylinder is too high or too long during rinsing, the spandex will degrade and cause the fabric to lose its elasticity. So how do you avoid losing the rinsing process?
(1) Do a pre-production test;
(2) The production of bleaching water must be deployed before it can be injected into the cylinder, prohibiting direct feeding;
(3) Drifting water must be added under the condition of equipment rotation to prevent insuflation due to high local concentration;
(4) The residue of the water left on the clothes after high temperature drying causes the degradation of spandex due to the release of chlorine, and attention should be paid to cleaning after bleaching;
(5) Strengthen the personnel management of online work, monitor the production status, and prevent the processing temperature or time from exceeding the process requirements to cause quality problems.
Many people will ask when they are facing such a high risk of insult. Is there a better rinsing solution? The answer is yes, but of course, Novozymes's enzymatic solution can completely solve the problem of insolubilization during the rinse process, because the cold-drift enzyme only acts on the indigo color and plays a bleaching role, without any other fiber. The damage is very suitable for the bleaching of fabrics with volatile shells.
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