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1. Selection of polyurethane elastic fibers
Quality standards:
Physical properties: Check the key indicators of polyurethane elastic fibers such as tensile strength, elongation at break, elastic recovery rate, etc. to ensure that they meet or exceed industry standards.
Durability: Evaluate the performance stability of the fiber after multiple stretching and recovery, as well as its water resistance, sun resistance and other properties.
Environmental protection: Confirm whether the fiber meets environmental protection requirements, such as whether it contains harmful substances, whether it is recyclable or degradable.
Supplier evaluation:
Choose suppliers with a good reputation and rich experience to ensure stable and reliable product quality.
Understand the supplier's production process, quality control system and after-sales service.
Sample testing:
Perform actual testing on the samples, including physical property testing, chemical property testing and actual application testing, to comprehensively evaluate the quality of the fiber.
2. Selection of cotton-like fibers (such as T400 yarn, 50/72F netless low-elastic yarn)
Fiber characteristics:
T400 yarn: Pay attention to its characteristics of being made of two polyester fibers, PET and PTT, spun in parallel, and the resulting permanent spiral curling structure and excellent elasticity and recovery. Check whether its elastic recovery rate is maintained at a high level (such as more than 95%), and whether it has a good memory function.
50/72F netless low-elastic yarn: Understand its fiber fineness (such as 50/72F represents the denier or fineness index of the fiber), elasticity level, and whether it is suitable for the production needs of knitted fabrics.
Quality evaluation:
Observe whether the fiber surface is smooth and uniform, and whether there are obvious defects and stains.
Evaluate the softness, comfort and elasticity of the fiber by hand feel.
Check the color fastness of the fiber to ensure that the color is not easy to fade.
Application test:
Combine the selected fiber with polyurethane elastic fiber to make a knitted fabric sample for testing. Evaluate the elasticity, comfort, washability and appearance stability of the fabric.
How can polyurethane imitation cotton knitted fabric suppliers reduce the phenomenon of broken ends and holes in the fabric during the knitting process of polyurethane imitation cotton knitted fabric and improve production efficiency?
1. Optimize raw materials and pretreatment
Select high-quality raw materials:
Ensure the quality of yarn and select yarn with high strength, less hairiness and high breaking strength.
Strengthen the re-inspection and process test of raw materials entering the factory to ensure that the raw materials meet the production requirements.
Sizing treatment of yarn:
Sizing treatment of yarn to improve the smoothness, fastness and friction resistance of yarn.
The sizing liquid should be able to partially penetrate into the interior of the yarn, and after drying, a layer of sizing film can be formed on the yarn to improve the wear resistance and breakage resistance of the yarn.
Pay attention to the sizing liquid formula and process to avoid the sizing liquid completely unable to penetrate into the interior of the yarn or excessive penetration, resulting in a decrease in the elongation of the yarn.
2. Adjust knitting process and equipment
Select suitable machine needles and sewing threads:
Select suitable machine needle models and sewing thread specifications according to the characteristics and requirements of knitted fabrics.
Avoid needle holes and broken ends caused by improper needle model, worn and hairy needle tip, or thick and rough sewing thread.
Adjust knitting machine parameters:
Reasonably adjust the position of needle plate hole and needle to avoid yarn squeeze and breakage caused by needle and needle plate hole edge being too close.
Ensure that the edge of needle plate hole and feed dog are not sharp to reduce damage to yarn.
Adjust the tension and speed of knitting machine as needed to reduce yarn breakage rate.
Use broken end automatic stop device:
Install broken end automatic stop device on knitting machine. When yarn breaks or bobbin yarn runs out, it can automatically lift the bobbin to avoid damage to yarn on bobbin surface.
3. Strengthen equipment maintenance and care
Regularly check and maintain equipment:
Regularly check and maintain knitting machine to ensure that the equipment is in good condition.
Pay special attention to the inspection and replacement of vulnerable parts such as needle, needle plate hole, feed dog, etc.
Keep the production environment stable:
Control the temperature and humidity of the production environment to avoid unstable yarn performance and broken ends caused by too cold ambient temperature or insufficient humidity.