Knitted
underwear is basically worn close to the body and is in direct contact with the skin, so its wearing performance is particularly important. Silk has good hygroscopicity and antistatic properties, and its protein composition is similar to that of human skin, so it feels soft and comfortable to wear. In addition, tryptophan and tyrosine in silk fibers absorb UV rays, which can effectively protect the skin from excessive damage. Although cellulose fibers such as cotton and linen are also natural fibers, they have good hygroscopic properties and are more comfortable as knitwear, but their softness and touch are far less than silk knitwear. Silk has natural health care functions unmatched by other fibers, so silk underwear products have a huge market space and will bring people into a brand-new clothing field. Weaving equipment and parameters 1. Equipment. Electronic circular knitting knitting machine, which is currently the most used model in my country's knitting enterprises. It is a single-sided one-shot computer knitting jacquard machine with eight-way feeding, and each channel has two independent jacquard drums (ie needle selectors). , 3-level knitting can be performed simultaneously for each channel (ie, three different actions of stitching, tucking and floating thread are performed at the same time by selecting needles at the same time). 2. Parameters. The diameter of the circular knitting machine for electronic forming package is 30-40cm (12-16 inches); the speed is 110r/min; , the power of the suction motor is 3.9kw; the number of yarn guides is 8/way (in practical application, it can be less than 8). Processing before weaving. Because silk has sericin and has high rigidity, it is easy to produce defects such as brittleness and missing needles during weaving, so it needs to be treated before weaving. If the twisted yarn from a general polyester filament factory is used, it needs to go through the following treatment process: put the twisted raw silk in a softener (such as ENS-I) and a foaming agent (such as HV-302), a liquor ratio of 1:20, Soak in a solution with a temperature of 40-50°C for 18 hours, dry, wind, and then knit on the machine. If the raw silk provided directly by the factory is used, it is necessary to place the raw silk in a vacuum container with a treatment solution (generally, a solution of Taikoo oil with a liquor ratio of 1:10, 109/L) at room temperature. The treatment solution quickly penetrates into the inner layer of the package and the inside of the sericin, and is woven on the machine after the treatment. Weaving process and technical points. The production of products with real silk has high technical requirements. The weaving process generally goes through three steps: sample analysis, program design, and commissioning on the machine: 1. Sample analysis and sample analysis, mainly including size analysis, color sample analysis, raw material analysis and fabric analysis. Organizational Structure Analysis. 2. Program design. Then, proceed with programming. After determining the yarn feeder and the number of channels, program in the special programming system according to the selection of the yarn feeder and the number of channels, and pay attention to the programming design of timely refueling and suction. The selection of the yarn feeder should be determined according to the performance of the machine itself. The front yarn feeder is on the inner layer, and the rear yarn feeder is on the outer layer. When weaving a fabric covered with a certain material, the sand feeder should be appropriately selected according to the needs. 3. On-board debugging. After the program is compiled, start debugging on the machine. During this process, the size should be strictly controlled, and the program should be modified repeatedly until the requirements are met.
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