JPS60126328A - Preparation of core yarn - Google Patents

Abstract

PURPOSE:To prepare core yarn having a small amount of waste yarn, not causing regular pattern on woven and knitted goods, by subjecting filaments to twisting with stable yarns in S and Z twist alternately to give two yarns, integrating the two yarns in such a way that parts having the opposite twist direction are incorporated each other. CONSTITUTION:The two stable rovings 1 and 1' are drafted by the draft zones 6-8, they are integrated with the two filaments 2 and 2' at an inlet of the front rollers 8, and sent to a false twist zone. Twist caused by the false twister 10 of two crossed belts is propagated to the upper stream so that the stable rovings are wound round the filaments. In the operation, the yarns 3 and 3' are nipped and released by the cut roller 9 having a notch on the peripheral surface, so that length of the twisting zone is changed and alternate twist of S and Z twist are formed. In the operation, nip and release are opposed between both the yarns 3 and 3' to inverse the twist direction. When the yarns 3 and 3' are incorporated by the collecting guide 11, one stable core yarn 4 of self twisting is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a core yarn, and more particularly to a method for manufacturing a core yarn using self-twisting.

Conventionally, a method of manufacturing yarn using self-twisting is known, and this self-twisting yarn has at least one yarn having alternate twists.

This results in a state in which a plurality of threads are intertwined, and the basic technology for this self-twisting thread is described in US Pat. No. 3,225,533. Also,
Regarding a method for producing a self-twisting yarn in which two yarns having alternating S and Z twists in the longitudinal direction of the yarn are wound with a stable sheath yarn around a core filament and the twist is stabilized. is described, for example, in Japanese Unexamined Patent Publication No. 56-58015.

That is, in Example 4 of the same publication, 72d t was used as the core yarn.
EX polyester false-twisted yarn was used, and wool braided yarn with an average fiber length of 62 mm and 3300 dtex was used as the sheath yarn, and the wool roving was stretched 35 times in a draft device and then mixed with the above polyester false-twisted yarn. Alternate twists are applied in a false twisting device, and the two alternately twisted yarns are combined to form a self-twist and then wound up as a self-twist yarn. A major feature of this type of self-twisting yarn manufacturing method is that core yarn in which filaments are covered with stable material can be produced at high speed. On the other hand, in the self-twisting yarn obtained by such a method, the periodic repetition of S and Z twists produces a regular pattern when woven or knitted, which narrows the range of application of the product.

In order to eliminate such drawbacks, the Japanese Patent Publication No. 44-30819
However, the additional twisting method proposed in the publication is effective.

When a self-twisted yarn with alternating S and Z twists is twisted in a certain direction, for example with an S twist, an S twist is further added to the S twist portion of the alternating twist, while the Z twist portion of the alternating twist is once untwisted. Since the S twist of the additional twist is added after the additional twist is applied, if the number of additional twists is not large, not only will it not be effective to prevent the stable from falling off or moving, but the unevenness of the twist due to the additional twist will impair the quality of the product. It has the following drawbacks. Therefore, additional twisting is more effective when the number of alternate twists is small. However, conventionally known methods for adjusting the number of twists in alternately twisted yarns include adjusting the number of false twists imparted by a false-twisted body; If the number of false twists is reduced, the stable winding will be poor (more cotton will fall), which is a drawback.

The present inventors did not solve the above-mentioned conventional drawbacks, and after conducting intensive research into manufacturing a core yarn with a small number of self-twists, they found that when combining two yarns with alternating twists, the yarn The present inventors have discovered that a yarn without the above-mentioned defects can be obtained by completely shifting the phases of the applied alternate twists and combining them, thereby achieving the present invention.

The object of the present invention is to easily obtain a core yarn with a small number of self-twists, and to produce a regular pattern when made into a woven or knitted fabric by additional twisting in the m direction with a relatively small number of additional twists. An object of the present invention is to provide a method for manufacturing a core yarn that can suppress generation.

That is, in the present invention, two yarns are formed in which a stable is wound around a filament and alternate twists of S (and Z1) are applied in the longitudinal direction of the yarn, and these two yarns are combined with each other to form a core yarn. The gist of the present invention is a method for producing a core yarn, which is characterized in that, when producing a core yarn, the parts of two yarns having opposite twist directions are joined together and combined.

Two aspects of the present invention will be described in detail below.

The present invention involves winding a stable around two filaments by means such as changing the length of the false twist zone, and applying alternate twists of S and Z twists in the longitudinal direction to form a two-tree yarn. The part where the twist directions of these two yarns are opposite, that is, the S twist part of the -) yarn and the Z twist part of the other yarn.
The twisted portions are attached to each other and combined. In other words.

Two pieces of yarn are combined by completely shifting the phases of the alternate twists. In the present invention, various methods can be adopted to completely shift the phases of the alternating twists of two yarns. For example, one method is to use two yarns that have been alternately twisted in the same phase in a false-twisted body. When leading to the coalescing point, the thread path of one yarn is lengthened by a half cycle of alternate twisting.

moreover.

Another method is to install a breaking roller with a part of the circumferential surface of the roller cut out in the heating zone of the process of imparting false twist to the false-twisted body, and to nip and separate the yarn with the breaking roller. When applying alternating twist by changing the length of the false twist zone.

A method of reversing the presence or absence of a nip using a breaking roller for two yarns can be mentioned.

In general, when producing yarn using self-twisting, self-twisting does not occur unless two yarns having alternate twists are combined with the same twist direction. Therefore, when trying to obtain a double yarn from two yarns with a stable wound around a filament using self-twisting, the two yarns are combined by aligning the parts with the same twist direction. Even if parts with different twist directions are attached together, self-twisting will not occur and only a yarn will be obtained that is susceptible to stable movement and shedding. However, the present inventors surprisingly found that when a core yarn is produced by winding a stable around a filament, a stable yarn can be obtained. In the present invention, the reason why a stabilized core yarn is obtained by attaching parts of two yarns with opposite twist directions in which a stable is wound around a filament is that the yarn end of the stable turns at the oven end. This is thought to be due to the fact that the yarns of the book are partially tied together, or that a slight self-twist is formed depending on which of the two yarns is stronger, Sli or Z twist. Therefore, the obtained core yarn is stable despite having a small number of self-twists, and has less staple movement and shedding than a core yarn with a small number of false twists (to form alternate twists). As it is, such a core yarn is more likely to undergo staple movement compared to ordinary self-twisting yarns that have a large number of self-twists, but by applying additional twisting, it is possible to eliminate staple movement. Because the twist is uniform in the length direction of the yarn, regular patterns do not occur when it is woven or knitted.

Two aspects of the present invention will be explained below using illustrated examples.

FIG. 1 is a process schematic diagram showing an example of the method for producing a core yarn of the present invention. Two stable rovings (11, (I
J' is drafted to a predetermined magnification in a draft zone equipped with a bank roller (6), an apron roller (71°) and a front roller (8).Meanwhile, two filaments!2
+, (2)' are combined with the staple roving (11, (11') at the entrance of the front roller (8), and the yarn (3)
1, (31') is sent to the false-twisting zone. In the false-twisting zone, the false-twisted body α0 where two wooden belts intersect
) gives a false twist to the yarn (31, +31'). At this time, the twist by the false twisting body αω propagates upstream and the staple roving is wound around the filament. Also, a part of one circumferential surface is cut off. Yarn (3) with missing breaking roller (9), +
By nipping and separating 31', the heated part of false twisting is periodically changed from the distance from the false twisting body QO) to the breaking roller (9) and from the false twisting body 00) to the front roller (8). ), i.e. the length of the false twist zone. For this purpose, the yarn (3) passed through the false twisted body (101).

(The 3rd pin contains alternating S and Z twists, and the focusing guide (1
1) Form a self-twist by combining both yarns.

It becomes one stable core yarn (4) and is wound up as cheese (5) via two pre-heli rollers (old) and a winding roller (131).

In the above, the yarns (31, (3)
When nipping and releasing 1', while yarn (3) is being nipped, yarn (3) is separated and yarn (
Allow yarn (3)° to be nipped while 3) is apart.

The S and Z portions of the generated alternating twists having opposite phases are aligned with each other and combined by a focusing guide (11), thereby obtaining a core yarn with a small number of self-twists.

In the present invention, by using filaments mainly made of synthetic fibers, such as polyester or polyamide, as the core yarn, and using staples mainly made of natural fibers, such as cotton or wool, as the sheath yarn, the high strength and wash-and-wear properties of synthetic fibers can be achieved. The core yarn can be made into a core yarn that simultaneously has the characteristics of natural fibers, such as a good texture and good hygroscopicity.

The present invention employs the above configuration.

The core yarn can be obtained as double yarn. In addition, it is possible to easily obtain a core yarn with an extremely small number of self-twists, and therefore, even with a small number of additional twists, it is possible to create a yarn with a uniform twist distribution, and when it is made into woven or knitted fabrics, it is possible to obtain a yarn with a uniform twist distribution. There is no risk of a pattern occurring. Moreover, even though the number of self-twists is small, a core yarn with less cotton drop can be obtained.

The present invention will be specifically explained below using examples.

Example A core yarn was manufactured using the steps shown in FIG. 1 using cotton roving as the staple and polyester filament as the filament. The cotton roving was 120 gel/30 yards thick, and the polyester filament was 50 denier/48 filament 1~. The cotton roving is drafted 32 times between the hack roller and the front roller and then doubled with the polyester filament.
The surface speed of the false twisted body is 350 m/min, I4! The taking speed was 150 m/min. The obtained yarn is 22
A core yarn of 4OS/2 was obtained which was repeated with S twists and 22 times at cm intervals and partially bound with cotton staples. When the resulting yarn was twisted at 400 turns/m and then used as the weft of a fabric, a uniform yarn was obtained without any periodic unevenness due to twisting.

Comparative Example Same as the example except that the breaking roller nipped and separated the yarn (3)'' at the same time so that the phase of the alternate twist of the yarn (3L (31') at the 1 coalescence point was the same) A core yarn was produced under the following conditions.When the obtained core yarn was additionally twisted with an S twist of 400 concave/m, and then inserted into the weft of a fabric, the periodic change in twist was strong, so it was difficult to obtain a uniform appearance. All I got was something unsatisfactory.

[Brief explanation of the drawing]

FIG. 1 shows an example of the method for manufacturing the core yarn of the present invention]
FIG. 2 is a schematic diagram. Patent Applicant Uni Jinriki Co., Ltd. Figure 1 3r-Continuation City Seal]Mo%l:t-(Method)%Formula% 2, Name of the invention: Noah 1-N's Salt 0'! Power: 2 people: 1. i+!
i, il-Part 1 of the Kasuru U Case 'IIF Applicant's Address: Hei 1ii (50-50 II, Higashihonmachi, Amagasakiyama, Prefecture 541 I) Address: 4-68, Kitayatabe-cho, Osaka Kozuka 1st Address Name Unif: Chikara Co., Ltd. Patent Department Telephone (1G-281-5258 (dial-in) 4, date of amendment order March 7, 1980 (Showa Showa 3 lotus 78 Nora)
Full text of the specification to be amended, Western-style statement of contents of the amendment (no change in content)

Claims (1)

[Claims] (1) A stable is wound around a filament to form two yarns with alternating S and Z twists in the longitudinal direction of the yarn, and these two yarns are combined with each other to form a core yarn. A method for producing a core yarn, characterized in that, during production, parts of two yarns with opposite twist directions are joined together and combined.