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What is the correlation coefficient of the fabric?

Update:10-05-2021
Summary:(1) Packing tension (PACKAGE DRAFT %): The tension of the elastic fiber on the roll is very important, and its tension s...

(1) Packing tension (PACKAGE DRAFT %): The tension of the elastic fiber on the roll is very important, and its tension should be kept even from the inside to the outside. If the tension is uneven, it will directly affect the effect of the woven fabric. The best roll tension is 8%-12%, and the tension error of each bobbin cannot exceed 3%.
(2) DTEX ON CHEESE: The number of threads on the tube is controlled by the rolling tension, for example: 44dtex rolling tension is 10%, that is, the actual number of threads on the tube is 40dtex, which is 10 thinner %. Nowadays, some spandex manufacturers believe that when the weight of spandex of each brand is the same, spandex with high rolling tension is undoubtedly longer in length, longer in weaving length, and lighter fabrics can be woven. At this point, you must pay attention to your products. The requirements are selected.
(3) Breaking strength (BreAKING TENACITY): Generally, each different brand or series of spandex has different strength performance. The test method can be tested in a conditioned environment with a 50mm strength machine, and the test is 100% (SS100), 200% (SS200), 300% (SS300), test five times each, generally observe the stability of 200% (SS200) data, and other data, the greater the strength, the greater the elongation of the fabric, and the speed of knitting Hurry up.
(4) Breaking elongation (BreAKING ELONGATION): When measuring the breaking strength, the breaking elongation can be measured. Generally, the greater the elongation, the less the fabric content.
(5) Forming degree: According to the appearance test, if the forming is not good, the shape of each tube is different, and the size is different, which are all unqualified.
(6) Oil adhesion: The best oil content of spandex is 5% (+/-2%). The more oil content or the longer the time, the outer layer of oil penetrates into the inner layer, and accumulates at the bottom of the cylinder, which affects the braiding tension and The loss is large. The general oil component is silicone oil, containing stearic acid metal ions.
(7) Elastic recovery rate: general fiber elongation 100% or more, called elastic fiber, refers to the length increase under tension, and returns to the original length when released, and the difference between the original length and the recovered length is the elastic recovery rate , Generally 95% or more.
(8) Specific gravity: The specific gravity of spandex is 1.10.
(9) Conventional moisture regain: generally 1.3 (ASTM).
(10) Softening temperature: generally 190 degrees Celsius/390 degrees Fahrenheit.
(11) Melting temperature: generally 250 degrees Celsius/437 degrees Fahrenheit.

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