Machine sewing thread
A sewing thread, twisting technology, applied in the direction of yarn, single-component polyester rayon, transportation and packaging, etc., can solve the problems of no elastic stretch, no stretch, no display, etc., and achieve stitch elasticity The effect of reducing and improving sewing performance and excellent uniformity
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Embodiment 1
[0080] Polypropylene terephthalate 1,3-trimethylene terephthalate with ηsp / c=0.8 was obtained under the condition of spinning temperature of 265°C and spinning speed of 1200m / min. Twisting was carried out under the conditions of 140° C., 3 times the elongation ratio, and 800 m / min of elongation speed to obtain an elongated yarn of 84 dtex / 36 f. The tensile strength elongation, initial elastic modulus and elastic recovery rate at 20% elongation of the extension cord were 3.5 cN / dtex, 40%, 24 cN / dtex and 95%, respectively.
[0081] The obtained poly(trimethylene terephthalate) fiber multifilament original thread-root adds 800t / m (S direction) down-twisting with Italian twisting machine, adds 600t / m ( Twisting in the Z direction) to obtain 3 sub-twisted yarns. The obtained 3 sub-twisted yarns were wound on a paper tube with a diameter of 79 mm by Softwinder manufactured by Shinzusha Co., Ltd. at a density of 0.35 g / cm 3 Coil 1Kg. The line tube was replaced with a dyeing tube (...
Embodiment 2
[0084] In the same manner as in Example 1, a 56 dtex / 24f polytrimethylene terephthalate extension cord was obtained. The tensile strength elongation, initial elastic modulus and elastic recovery rate at 20% elongation of the extension cord were 3.4 cN / dtex, 38%, 23 cN / dtex and 92%, respectively.
[0085] Add 800t / m (Z direction) downtwist to one of the obtained polytrimethylene terephthalate fiber multifilament raw yarns with Italian twister, add 1700t / m after 2 parallel lines (S direction) middle twist, then add 600t / m (Z direction) top twist after the thread that has added middle twist 3 lines, obtain 6 sub-twists. Except that the obtained 6 sub-twisted yarns are changed to the package yarn winding density and the package yarn dyeing replacement rate recorded in Table 1, the rest are obtained in the same way as in the examples. The long-term elastic recovery rate and tenacity curve are equivalent to #40 sewing thread.
[0086] The sewing thread is excellent in level dyeing...
Embodiment 3
[0088] In the same manner as in Example 1, a stretched polytrimethylene terephthalate of 110 dtex / 48f was obtained. The tensile strength elongation, initial elastic modulus and elastic recovery rate at 20% elongation of the extension cord were 3.4 cN / dtex, 42%, 23 cN / dtex and 94%, respectively.
[0089] With the obtained polytrimethylene terephthalate fiber multifilament raw thread, Ishikawa Manufacturing Co., Ltd. manufactures and sells a false twister IVF338, with a linear speed of 190m / min, a false twist number of 2900T / m, and a false twist process. False twist processing was carried out under the conditions of temperature 160°C, lst feed rate 0.0%, and TU feed rate 3.5%. Two obtained false twisted yarns were twisted together under the condition of 150 t / m (Z direction) with Italian twister. The obtained twisted yarn was obtained in the same manner as in Example 1 except that the winding density of the package and the replacement rate of the package when dyeing the package...
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