JP3471143B2 - Method for producing bulky crimped elastic coated yarn - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a bulky crimped elastic coated yarn comprising a polyester filament composite structure processed yarn and a polyurethane elastic yarn. More specifically, the present invention relates to a method for producing a bulky crimped elastic coated yarn twisted in two steps. 2. Description of the Related Art Conventionally, an elastic coated yarn whose surface is coated with a normal yarn or a processed yarn in consideration of the feeling, feel, light resistance and the like, when a bare yarn is used as it is. Sometimes used. A general method for producing an elastic coated yarn is, for example, a method in which a plain yarn or a processed yarn is wound around an elastic yarn using a hollow spindle as shown in FIG. 1, or a final process of spinning using an elastic yarn as a core. There is a core-span method and the like in which a spinning yarn is twisted together with a roving of ordinary yarn by a spinning machine. Each of these methods is a method in which a normal yarn is wound in a state where an elastic yarn is stretched. In the case of long fiber filaments, the method shown in FIG. 1 is mainly used. However, since this method has problems such as low productivity, high cost and difficulty in packaging, it has been proposed various production methods. For example, Japanese Patent Application Laid-Open No. 58-136842 discloses that in the first stage, an elastic yarn stretched to a draw ratio of 3.0 to 5.0 using a method shown in FIG. Covered with a twist number in the range of about 1/3 of the twist number,
In the step, a method for producing a single-layer coated elastic yarn in which the coated elastic yarn obtained by the method shown in FIG. 2 is subjected to additional twisting in the same twisting direction as the twisting direction in the first stage and the coated yarn is wound around the elastic yarn is disclosed. Have been. However, the technique disclosed above can be an effective means when fine denier is used for the covering yarn, but when the thick yarn is used in the first stage, the spindle rotation speed is reduced. If not dropped, manufacturing becomes difficult. Also, if the coated yarn is made of a polyester filament composite structure processed yarn, there is a problem in quality, that is, the coated yarn is nep and the yarn quality is not stable. It has drawbacks. Japanese Patent Application Laid-Open No. 48-33143 discloses a bulky crimp in which untwisted ordinary yarn and an elastic yarn in an extended state are combined, pre-twisted, and false-twisted. A method for producing an elastic yarn is disclosed. However, this technology has high productivity, that is, low cost, but when a polyether polyurethane is used for the elastic yarn, the temperature is added during false twisting. Cause a decrease in Further, the texture of a woven fabric composed of a bulky crimped elastic yarn using a polyester filament composite structure processed yarn as a covering yarn cannot be obtained. [0006] In recent years, there has been a strong demand for inexpensive bulky crimped elastic coated yarns of particularly stable quality. SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive and bulky polyurethane elastic yarn as a core yarn and a polyester filament composite structure processed yarn as a coating yarn. An object of the present invention is to provide a method for producing a crimped elastic coated yarn. Means for Solving the Problems The inventors of the present invention have intensively studied the production conditions for the cause of impairing the quality of a bulky crimped elastic coated yarn. By finding that there is a high correlation with quality, by applying a specific number of twists using a knitting machine and applying additional twisting to a single elastic coated yarn, it is possible to produce excellent quality. And arrived at the present invention. That is, the present invention relates to a polyester filament composite structure processed yarn having no twist,
Using a twisting machine, the elastic yarn stretched 3.5 times and
合 120 T / m, twist twisting is applied, and then additional twisting is performed in the same twisting direction as the twist twisting, and the twist coefficient is 1
0200 or more. The method of the present invention will be described in more detail. The polyester filament composite structure processed yarn referred to in the present invention is generally referred to as a worsted or hemp-processed yarn, and includes a composite false twist with a different elongation, a composite false twist with a different yarn length, and a two-feed taslan. The elastic yarn referred to in the present invention is a polyether-based polyurethane having a fineness of preferably 15 to 60.
And more preferably 20 to 40 denier. The draw ratio of the elastic yarn at the time of coating with the twisting machine shown in FIG. 3 is 1.5 to 3.5 times. When the stretching ratio of the elastic yarn is 1.5 times or less, the amount of the elastic yarn in the bulky crimped elastic covering yarn increases, the cost increases, and the texture of the woven fabric is soft. (A state in which the elastic yarn is not completely covered by the covering yarn), which is not preferable. On the other hand, when the stretching ratio of the elastic yarn is 3.5 times or more, it is not preferable because the yarn breaks and the texture becomes hard when woven. In the method for producing a bulky crimped elastic coated yarn of the present invention, it is important that the number of twists in the first step is 60 to 120 T / m, and more preferably 80 to 100 T / m. m. FIG. 4 shows a single elastic coated yarn (hereinafter, referred to as a "elastic yarn") in which an elastic yarn stretched to a draw ratio of 2.5 times by using the method shown in FIG.
The number of occurrences of neps of the coated yarn (abbreviated as single covering yarn) was measured and the yarn quality was evaluated. The results of FIG. 4 indicate that the smaller the number of twists, the more the number of occurrences of neps It can be seen that a yarn having a reduced yarn quality is obtained. However, when the number of twists is small, the snacking of the woven fabric becomes worse when the composite structural yarn is used. FIG. 5 schematically shows the relationship between the coating yarn denier and the spindle rotation speed using 20 denier (drawing ratio 2.5 times) as the elastic yarn using the method shown in FIG. so,
It can be seen that the larger the covering yarn denier, the lower the rotational speed of the spindle must be reduced in a quadratic curve to manufacture the yarn. That is, in the method shown in FIG. 1, as the covering yarn denier becomes larger, the productivity is greatly reduced and the cost is increased. Therefore, when thick denier is used for the covering yarn, the method shown in FIG. 1 is unsuitable for imparting the first twist in the first step, and the present invention is not used in the first step using the method shown in FIG. Process characteristics. When the number of twists is 60 T / m or less,
When the additional twisting in the second step is performed, variation in the unwinding tension from the pan increases, leading to yarn breakage, generation of knots,
Further, the resulting bulky crimped elastic coated yarn is liable to cause twist unevenness, which is not preferable. In the case of 120 T / m or more, as the number of twists increases, the balloon of the yarn increases, and the coated yarn hits the separator (13), and the winding amount decreases due to the restriction of the distance between spindles (spindle interval). At the same time, there is a problem that the increase in the number of twists causes a disadvantage such as a decrease in productivity due to a decrease in productivity. Although the direction of the first twist in the first step is not particularly limited, the direction of the additional twist in the second step needs to be the same as the direction of the first twist. (= Number of twists × √fineness of yarn) is 10200 or more. The additional twist is preferably performed with a double twister. In the case where the twist coefficient is 10200 or less, the coating of the elastic yarn in the bulky crimped elastic coated yarn under tension is poor,
At the time of tension, the degree of the elastic yarn (the elastic yarn is not completely covered with the covering yarn) becomes large. Therefore, the woven fabric using the bulky crimped elastic coated yarn does not dye the elastic yarn,
Elastic yarn that does not dye becomes a fabric defect appearing on the fabric surface, and snacking worsens. Hereinafter, the present invention will be further described with reference to examples. The determination criteria for the products in the examples were as follows. (1) As shown in FIG. 6, a method for evaluating the number of occurrences of the nep of the coated yarn of the bulky crimped elastic coated yarn is as follows: a blackboard (17) (300 mm × 20 mm).
A bulky crimped elastic coated yarn (18) was wound at a pitch of 2 mm (winding length: 54 m) around 0 mm x 2 mm) to evaluate the number of neps (number / m) of the coated yarn. (2) Thread breaks of the double twister The number of yarn breaks per unit of the twisting machine (256 spindles) when the single covering yarn after the twisted first twisting is additionally twisted using the double twister. Was evaluated. (3) Number of knots generated during double twister twisting The number of knots generated in the coated yarn of the bulky crimped elastic coated yarn was evaluated in the same manner as in the number of generated neps. Examples 1-3, Comparative Examples 1-3 As the elastic yarn (9), a polyether-based polyurethane having a fineness of 40 denier and 4 filaments (trade name: Leica, manufactured by Asahi Kasei Kogyo Co., Ltd.) was used. As the covering yarn (8), a regular polyester filament having a fineness of 75 denier and 24 filaments and a fineness of 71 were used.
Denier 48 filament highly oriented undrawn yarn (POY)
(Manufactured by Asahi Kasei Kogyo Co., Ltd.) and composite structure processed yarn (fineness: 175 denier 74 filament)
Twist direction: Z twist). First, using a machine shown in FIG. 3 in which the yarn feeder of the twisting machine manufactured by Ishikawa Seisakusho Co., Ltd. (trade name: STP winder) is modified into a rolling type, the elongation of the loica (9) is started. The magnification and the number of twists are as shown in Table 1. Spindle rotation speed: 7000 times / min. Traveler (15): SSB # 2
6. Single covering yarn (14) 700 twisted and twisted under the condition of elongation rate of composite structure processed yarn (8): 0.5%.
g was produced. Next, the obtained single covering yarn having been subjected to the plying twisting is applied to a double twister (manufactured by Murata Machinery Co., Ltd., model No. 308) shown in FIG. Times / minute, ball tensor: 1 piece (3.9 mmΦ), ring tensor: 1 piece (type: 3
02-S418-60H, weight: 2 g / piece), and a twisting coefficient was set as shown in Table 1 to obtain a bulky crimped elastic coated yarn (7). As is clear from Table 1, the bulky crimped elastic coated yarns (7) of Examples 1 to 3 have no problem in the industrial production of the yarn breakage by the double twister, and the bulky crimping. The coated yarn of the elastic coated yarn (7) does not generate a nep, and no knots are generated at the time of additional twisting. On the other hand, the bulky crimped elastic coated yarn produced in Comparative Example 1
In (7), although no nep occurred, knots occurred during twisting with a double twister. In Comparative Example 2, although there is no problem in the evaluation of the bulky crimped elastic coated yarn and the yarn breakage during the double twisting with a twist, the productivity is low and the cost is increased due to the large number of twists. In Comparative Example 3, a nep occurred. [Table 1] According to the method for producing a bulky crimped elastic coated yarn of the present invention, a bulky crimped elastic coated yarn having a stable yarn quality can be obtained as compared with the conventional production method, and the production cost can be further improved. Can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view schematically showing a mechanism of a covering machine for winding a normal thread or a processing thread around an elastic thread using a hollow spindle. FIG. 2 is a schematic view of a mechanism of a double twister. FIG. 3 is an explanatory view schematically showing the mechanism of a twisting machine used in the present invention. FIG. 4 is a diagram showing the number of twists and coating of a bulky crimped elastic covering yarn when the covering machine of FIG. 1 is used. FIG. 5 is a graph showing the relationship between the number of yarn neps generated and FIG. 5 is a graph showing the relationship between the coated yarn denier and the spindle rotation speed when the covering machine shown in FIG. 1 is used. , An elastic yarn 2 ... a driving belt 3 ... a coating yarn 4 ... a single covering yarn 5 after pre-twisting 5 ... a driving belt 6 ... Single covering yarn 7 after first twist Bulky crimped elastic covering yarn 8 ... covering yarn 9 ... elastic yarn 10 ... driving roll 11 ... driving roll 12 ... stretch roll 13 ... separator 14 ... single covering yarn 15 after first twist. ... Traveler 16 ... Drive belt 17 ... Blackboard 18 ... Bulk crimped elastic coated yarn

Continuation of the front page (56) References JP-A-58-136842 (JP, A) JP-A-5-117931 (JP, A) JP-A-5-302204 (JP, A) JP-A-51-40453 (JP, A) JP-A-6-10226 (JP, A) JP-A-7-109634 (JP, A) JP-A-58-180624 (JP, A) JP-A-62-57959 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) D02G 1/00-3/48 D02J 1/00-13/00

Claims (1)

(57) [Claims 1] The twisted polyester filament composite structure processed yarn and the elastic yarn stretched and stretched 1.5 to 3.5 times are stretched and stretched to 1.5 to 3.5 times by a twisting machine at 60 to 120 T / C. m. A method for producing a bulky crimped elastic coated yarn, comprising adding a twisted first twist of m, and then performing additional twisting in the same twisting direction as the twisted first twist to have a twist factor of 10200 or more.