JPH03186566A - Fraying of urethane thread - Google Patents

Abstract

PURPOSE:To permit the smooth fraying of an urethane thread and increase the working speed by setting the winding angle of the urethane thread for a feed roller to an angle with which a pulling-out tension does not rise on the surface of a package because of the contact friction between the surface of the feed roller and the urethane thread which contacts the surface of the feed roller. CONSTITUTION:An urethane thread package 12 is placed on a feed roller 11 which positively revolves, and the package 12 is revolved by the contact revolution with the roller 11, and a urethane thread 13 is driven out through the winding contact over nearly the half of the peripheral surface of the roller 11, and the fraying of the thread 13 is carried out through the extension to 2 - 4 times through nipping between a nipping roller 16 and a drawing roller 15 which revolves at the higher speed than that of the roller 11. In this case, the elongation tension applied on the thread 13 by the revolution difference between the rollers 11 and 15 is generated between the point 18 where the thread 13 separates from the peripheral surface of the roller 11 and a nipping point 17, and the influence of the extension force due to the roller 15 is not given to the thread 13 at a contact point 14 because of the existence of the frictional resistance generated between the thread 13 and the peripheral surface of the roller 11.

Description

[Detailed description of the invention] [Industrial application field]

This invention relates to a method for unwinding a urethane thread wound around a package.

[Conventional technology]

Urethane-based yarns are usually used as the core 1aIIf of covering yarns and the like. When manufacturing such covering systems, etc., the urethane thread wrapped around the package should be
The urethane yarn package 2 is unraveled while being stretched to about twice its original size and then fed to the processing equipment, as shown in FIGS. 3A and 3B. The urethane thread 3 is passed between the package 2 and the feed roller 1 while rotating the package 2 by contact rotation.
The urethane thread 3 is pulled out from the contact point 4, and is nipped between a draw roller 5 that actively rotates at a higher speed than the feed roller 1 and a nip roller 6 that rotates in contact with the draw roller 5, and is unraveled while being stretched by about 2 to 4 times. was sowing. However, when using this method, the stretching tension applied to the urethane yarn 3 due to the rotation difference between the feed roller 1 and the draw roller 5 is applied to the urethane yarn 3 at the contact point 4 between the feed roller 1 and the package 2, and at the urethane yarn due to the draw roller 5 and the nip roller 6. 3 and nip point 7, and as a result,
The stretching tension directly affects the surface layer of the package 2 and causes the occurrence of twill disorder and thread breakage, and is a major factor that prevents the processing speed from increasing. [Problems to be Solved by KR Ming] The present invention prevents the stretching tension applied to the urethane yarn from acting on the package surface layer when unwinding the urethane yarn pancage, causing twill disorder and yarn breakage. The purpose is to smoothly unwind urethane yarn and increase processing speed. 1.Means for solving the problem: From a package of urethane yarn placed on a feed roller, the urethane yarn is pulled out by winding it around the circumferential surface of the feed roller, and is unwound while applying stretching tension to the yarn. In the method for unwinding urethane yarn, the winding angle of the urethane yarn around the feed roller is determined by the contact #friction between the unwinding tension and the surface of the feed roller and the urethane yarn in contact with it.
The angle was set so that it would not run up onto the package surface. 1 Effect] By keeping the winding angle of the urethane thread around the feed roller at an angle that prevents the pull-out tension from running up to the package surface due to contact friction between the feed roller surface and the urethane thread in contact with it, the feed roller surface and the urethane thread are The contact surface with the urethane yarn becomes longer and the surface frictional resistance increases therebetween, thereby preventing the stretching tension applied to the urethane yarn from directly reaching the package surface layer of the urethane yarn when the package is unwound. KEmbodiment J The present invention will be described in detail below with reference to the drawings. In the first embodiment shown in FIGS. 1A and 1B, a package 12 of urethane yarn is placed on a feed roller 11 that rotates actively.
The package 12 is rotated by contact rotation with the feed roller 11, and the urethane thread 13 is wound around almost half of the circumferential surface of the feed roller 11 and fed out while being in contact with the feed roller 11 at a higher speed than the feed roller 11. The urethane thread 13 is nipped between a draw roller 15 that actively rotates and a nip roller 16 that rotates in contact with the draw roller 15, and is unraveled while being stretched by about 2 to 4 times. At this time, the stretching tension applied to the urethane thread 13 due to the rotation difference between the feed roller 11 and the draw roller 15 is as follows:
It is formed between a point 18 where the urethane yarn 13 leaves the circumferential surface of the feed roller 11 and a nip point 17 of the urethane yarn 13 between the mud roller 15 and the nip roller 16, and is in frictional contact with the circumferential surface of the feed roller 11 over approximately half a circumference. Due to the presence of frictional resistance between the urethane thread 13 and the peripheral surface of the feed roller 11, the feed roller 11
The stretching force of the draw row 515 does not affect the urethane yarn located at the contact point 14 between the package 12 and the package 12, and the surface layer of the package 12 is not damaged by stretching the urethane yarn. In addition, in the second embodiment shown in FIGS. 2A and B, 1a
A package 22 of urethane yarn is placed on a rotating feed roller 21, and the package 22 is rotated by contact rotation with the feed roller 21, and a urethane yarn 23 is wound around the entire circumference of the feed roller 21. The feed roller 21 is brought into contact with the feed roller 21 through the system guide 29.
The urethane yarn 23 is nipped between a draw roller 25 that actively rotates at a higher speed than the yarn and a nip roller 26 that rotates in contact with the draw roller 25, and is unraveled while being stretched by about 2 to 4 times. At this time, the stretching tension applied to the urethane yarn 23 due to the rotational difference between the feed roller 21 and the draw 0-525 is between the point 28 where the urethane yarn 23 leaves the feed roller 21 and the point 28 where the urethane yarn 23 is separated from the feed roller 21 by the draw roller 25 and the nip roller 26. Due to the presence of frictional resistance between the urethane yarn 23 and the feed roller 21 circumferential surface, which is formed between the nip point 27 and is in frictional contact with the feed roller 21 circumferential surface over almost the entire circumference, the feed roller The stretching force does not affect the contact point 24 between 21 and the package 22, and the surface layer of the package 22 is not damaged by stretching the urethane thread. However, the influence of the stretching tension on the point 28 where the urethane thread 23 leaves the feed roller 21 is slightly reduced by the frictional contact between the thread guide 29 and the urethane thread 23. That is, in the present invention, a package of urethane yarn is placed on a feed roller, the urethane yarn unwound from the package is brought into contact with the peripheral surface of the feed roller, and the winding angle of the urethane yarn with respect to the feed roller is adjusted to By keeping the pulling tension at an angle that prevents it from running up to the package surface due to contact friction between the feed roller surface and the urethane thread in contact with it, the influence of the drawing tension applied to the urethane thread is prevented from directly affecting the package surface layer. be. Therefore, the specific configuration of the unwinding device is not limited to the above two embodiments. K Effects of the Invention Σ As described in detail above, the method for unwinding urethane yarn of the present invention involves pulling out the urethane yarn from the urethane yarn package placed on the feed roller by winding it around the peripheral surface of the feed roller. In the unwinding method of urethane thread, in which the thread is unwound while being stretched and tension is applied to the drawn thread, the winding angle of the urethane thread around the feed roller is controlled by the tension applied to the package surface due to contact friction between the feed roller surface and the urethane material in contact with it. The angle is set so that it does not go upstream, and this prevents the stretching tension applied to the urethane yarn from directly reaching the package surface layer of the urethane yarn package when unwinding the package, and as a result, the twill disturbance during unwinding. We were able to completely eliminate the occurrence of yarn breakage and yarn breakage, and realized faster processing speeds, greatly contributing to improved productivity.

[Brief explanation of drawings]

FIGS. 1A and 1B are a perspective view and a side view showing a first embodiment of the method of the present invention, FIGS. 2A and 2B are a perspective view and a side view showing the second embodiment of the invention, and FIG. B is a perspective view and a side view showing a conventional embodiment. 1.11゜2.12゜3.13゜5.15゜6.16゜21...Feed roller. 22...Package. 23... Urethane thread. 25...Draw roller. 26...Nip roller

Claims (1)

[Claims] 1. In a method for unwinding urethane yarn, the urethane yarn is pulled out from a package of urethane yarn placed on a feed roller by winding the yarn around the feed roller, and unwinding while applying tension to the yarn. A method for unwinding urethane yarn, characterized in that the angle at which the urethane yarn is wound around the feed roller is set at such an angle that the pull-out tension does not run up onto the package surface due to contact friction between the feed roller surface and the urethane yarn in contact with it.