What Is the Reason Why Denim Fabric Loses Elasticity After Washing? How to Improve It?

High elastic silk materials are becoming more and more common in denim fabrics, and the elasticity directly determines the progress of denim washing process. Elastic denim clothing is not only poor in quality and easy to lose elasticity, but also affected by many external factors. Elastic denim products often lose their elasticity in the process of garment making and washing, which is mostly caused by the following problems.1 Generally, the drying temperature of denim fabric of elastic silk is lower than 60 , so too high temperature will cause great damage to the elasticity. Therefore, elastic protectant should be used before denim washing, which can well prevent the damage to denim fabric caused by too low elasticity and appropriately reduce the risk of elastic breakage.2 Cowboy clothing washing machine rotates too fast, resulting in large mechanical force, which often leads to the loss of elasticity of some fabrics. Therefore, shorten the time as far as possible or use soaking and inching method to be too soft, and maintain appropriate machine speed and rotation speed can reduce the risk of bullet breaking;

3 When denim clothing is washed too soft, when the water temperature in the cylinder is too high or the time is too long, the fabric will degrade and eventually lead to fracture, making the fabric lose elasticity. Therefore, attention should be paid to controlling the appropriate water temperature;4 Due to the different formulations of softener and silicone oil by various auxiliary manufacturers, some softeners and silicone oil damage the elasticity, mainly because a small amount of solvent in its components affects the elasticity. Therefore, the correct softener should be selected and the appropriate dosage should be guaranteed.

5 The needle used in the sewing process of denim clothing can be divided into manual needle, which is called hand sewing needle; Needle for sewing machine, called machine needle; Other needles, sewing needles or pins for marking. In the process of garment sewing, the most difficult thing to master is to sew fabrics with good elasticity, which is also difficult to master and troublesome for sewing lathe masters, because too thick needle or poor sewing will lead to elastic fracture, blistering and deformation of spandex fabric. Therefore, for sewing elastic textile fabrics, round needle tip machine needles should be used, and special attention should be paid to not using too thick machine needles, Avoid a large number of fiber breakage.

Important notes on rinsing and corresponding pH value of elastic denimWhen there are products to be rinsed, pay special attention to adjusting the pH value of the bleaching water. If there is too little NaOH (caustic soda, flake soda), it will lose elasticity due to the brittleness of the bleaching water; If there is too much caustic soda and the pH is too high, the ester bond in polyurethane will degrade and lose elasticity. Therefore, the optimal pH is 11-12 and must not exceed 12. At the same time, the temperature should not be too high to reduce the loss of effective spandex and control the temperature

In order to improve the competitiveness of denim products and reduce the elastic loss of denim products after washing and dyeing processing, we must analyze the fibers and fabrics from the source, test various water washing and dye additives before production, set the best process, strengthen the operation management of front-line staff in production and find problems in time, so as to improve the product quality.