Sewing thread, method for producing sewing thread and sewed products
A manufacturing method and sewing thread technology, applied in the field of sewn products, can solve the problems of no elastic stretchability, no stretchability, no display, etc., and achieve the effects of reduced stitch elasticity, improved 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] One of the obtained polytrimethylene terephthalate fiber multifilament raw threads adds 800t / m (S direction) primary twist with Italian twister, adds 600t / m ( Z direction) final twist to obtain 3 sub-twists. The obtained 3 sub-twisted yarns were wound on a paper tube with a diameter of 79 mm by Softway Soda 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 (liquid-through treatme...
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 a primary twist of 800t / m (Z direction) to one of the obtained poly(trimethylene terephthalate) fiber multifilament raw threads with an Italian twister, and add 1700t / m after 2 parallel lines. (S direction) middle twisting, then add the final twist of 600t / m (Z direction) after this added the thread of middle twisting 3 parallel lines, obtain 6 sub-twisting threads. 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.
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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 parallel twisted under the condition of 150t / 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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