JPS6140773B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides a method for producing a core/sheath alternating yarn in which wound yarns are wound around a core yarn so that the twisting directions are alternately different along the longitudinal direction of the core yarn, and the core yarn and the wound yarn are alternately replaced. It is related to. Conventionally, there is a method for manufacturing a yarn having a structure in which two or more types of yarn are simultaneously false-twisted so that the twisting start positions of each yarn are different, and a wound yarn is wound around a core yarn. , is known from Japanese Patent Publication No. 47-49459 and Japanese Patent Publication No. 45-28018. In addition, the yarn form obtained by these methods is an alternately twisted crimped yarn in which the wound yarn is wound in different directions along the longitudinal direction of the core yarn, and is different from a normal crimped yarn. It has an excellent texture and appearance that is invisible to the naked eye, and is characterized by the ability to change product performance. However, in these methods of using yarn, the core yarn and the winding yarn are separated, so the design effect of the core yarn and the winding yarn is poor. The present invention solves the deficiencies of the conventional method, and the gist of the invention is that when two or more types of yarns are aligned and false-twisted at the same time, the feeding rate of each yarn is adjusted relative to each other. By supplying the yarn to the twisting area while alternating its size and false twisting, each yarn is alternately made into a core yarn and a wound yarn along the longitudinal direction of the obtained bulky yarn, and the yarn is A method for producing a special bulky yarn characterized by alternating the winding direction of the yarn from SZ to Z. The present invention will be explained in more detail with reference to the drawings. The figure is a side view showing an example of an apparatus used for carrying out the present invention. By relatively alternately speeding up and slowing down the speeds of rollers 1 and 2, the yarn fed from the faster feeding roller is wound around the yarn fed from the slower feeding roller. The yarn enters the heater 3 as a combined yarn, undergoes a false twisting process using a false twisting spindle 4, passes through a delivery roller 5, winds up, passes through a traverse 6, and is wound up into a winding package 8 by a winding drum 7. In the present invention, it is essential that the feeding speed of the yarns A and B is relatively varied alternately, and the yarns with a fast feeding speed become winding yarns and those with a slow feeding speed inevitably become core yarns. . Further, to explain specifically how to change the yarn feeding speed, possible methods include electrically controlling the paper feeding roller using a servo motor or the like, and using an eccentric roller in the yarn feeding roller section. The method for obtaining the yarn of the present invention is not limited in any way. In addition, if the pitch ratio between the core yarn part and the wound yarn part of one yarn is relatively small (1:1 to 3:1), and each pitch is longer than 10 mm, the heathered grains will appear periodically on the other side of the fabric. Although it tends to appear easily and has a poor design effect, if it is within the range of about 5 to 10 mm, an excellent design effect can be obtained. Furthermore, if you want to randomize the alternation of core and sheath, electrical control is preferable, but even if you simply change the yarn feeding speed periodically using an eccentric roller, the pitch of each supplied yarn appearing on the yarn surface will be about 5 to 10 mm. If it is a change, the periodic change in the pattern can be sufficiently compensated for by considering the fabric design, etc. If the pitch ratio between the core of one yarn and the wound yarn is greater than 3:1, almost no periodicity will appear on the other side of the fabric even if each pitch is longer than 10 mm. This tendency shows that the larger the ratio is, the less periodicity appears. By using the method of the present invention, for example, by using materials with different dyeing levels, materials with different luster, and materials with different dyeing properties, yarns with alternating colors in the longitudinal direction of the yarn can be obtained, resulting in excellent design effects. It will be done. In particular, when the pitch ratio between the core thread and the winding thread is 10:1 or more, a seemingly unique net-like effect can be obtained. Furthermore, by increasing the overfeed rate within the range that allows stable false twisting, the wound yarn is wound around the core yarn in alternating left and right twists, creating a yarn form with double or triple structure slab parts. Therefore, it is possible to obtain a yarn having an even greater design effect. In other words, it is possible to create a yarn in which the slab part has a different color from the ground yarn part. As described above, the present invention obtains a core/sheath alternating yarn with significant added value by changing the combination of materials and yarn feeding speed. Next, the present invention will be specifically explained using examples. Example 1 In the apparatus shown in the figure, a polyester synthetic fiber 50 denier/24 filament yarn was used as yarn A, and a polyester synthetic fiber 75 denier/24 filament yarn was used as yarn B, and false twisting was performed under the following conditions. Ta. Spindle rotation speed: 20×10 ⁴ r/m False twist coefficient: 2600T/M(Z) Supply ratio of yarns A and B: 1:1.25 to 1.25:1 Heater temperature: 220℃ The obtained yarn is wound with 50 denier A design with a difference in gloss that alternates between a part where 75 denier crimped yarn is intertwined with the crimped yarn in a false twist structure and a part where 50 denier crimped yarn is wrapped around the 75 denier crimped yarn. It was a core/sheath alternating yarn with excellent properties. Example 2 False twisting was carried out using the apparatus shown in the figure using polyester synthetic fibers 50d/24f as thread A and cationic dyeable polyester synthetic fibers 75d/24f as thread B under the following conditions. Spindle rotation speed: 20×10 ⁴ r/m Number of false twists: 2700T/M(Z) Supply ratio of yarns A and B: 1:1.18 to 1.18:1 Heater temperature: 225℃ The obtained yarn is cationic dye The winding part of the dyeable yarn appeared to have a netpu-like appearance. Example 3 False twisting was carried out under the same conditions as in Example 1 except that the feeding ratio of yarns A and B was as shown in the table below.

[Table] The obtained yarn had a randomly formed core and sheath, and when it was made into a woven fabric, it had an excellent design effect with no grains appearing on the other side of the woven fabric. Example 4 A feed roller for feeding yarn C, which is different from yarns A and B, is attached to the device shown in the figure. Yarn A is a polyester synthetic fiber 50 denier/24 filament, and yarn B is a polyester synthetic fiber 75 denier/24 filament. Cation dyeable polyester synthetic fiber 75 denier/24 filament was used as the filament and yarn C, and the yarn supply ratio was as shown in the table below, and the other conditions were the same as in Example 1. False twisting was performed. ,
A yarn was obtained in which three types of yarns A, B, and C were randomly arranged as a core-sheath.

【table】 [Brief explanation of the drawing]

The figure is a side view showing an example of an apparatus used to carry out the present invention, in which 1 and 2 are feed rollers, 3 is a heater, 4 is a false twist spindle, 5 is a delivery roller, and 6 is a traverse guide.

Claims (1)

[Claims] 1. Obtained by aligning two or more types of yarn and performing false twisting at the same time, by supplying each yarn to the twisting area while alternating the relative size of each yarn and performing false twisting. A method for manufacturing a special bulky yarn, characterized in that each thread is alternately made into a core yarn and a wound yarn along the longitudinal direction of the bulky yarn, and the winding direction of the wound yarn is alternately changed from SZ to SZ.