JPS59137533A - Self-twisted yarn and production thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a self-twisting yarn and a method for producing the same.

A method of manufacturing yarn using self-twisting has been known for a long time, but self-twisting generally refers to the joining of two or more yarns, and at least one yarn is alternately connected. It has twist, which results in multiple threads intertwined.

The basic technology of self-twisting is disclosed in U.S. Patent No. 3,225゜5.
It is described in the specification of No. 33.

Regarding a method for producing a self-twisting yarn in which two yarns having alternating sl and Z twists are combined in the length direction of a yarn in which a stable serving as a sheath yarn is wound around a filament of a core yarn to stabilize the twist. 2 is described, for example, in Japanese Patent Application Laid-Open No. 56-58015. Namely.

In JP-A-56-58015, in Example 4, a polyester false twisted yarn of 72 d tex was used as the core yarn, and a wool roving with an average fiber length of 62 m+ and 3300 dte was used as the sheath yarn, and the wool roving was passed through a draft device. After being stretched by 35 times, the polyester nontel false twisted yarn is subjected to alternate twisting in a false twisting machine, and the two alternately twisted yarns are combined to form a self-twisted yarn, which is then wound as a self-twisted yarn. taken. A major feature of this type of self-twisting yarn is that it can produce composite fibers in which filaments are covered with staples at high speed. On the other hand, this self-twisting yarn is st
This method has the drawback that the staples may fall off or move around the zero-twist portion where the g and Z twists are reversed, that is, the twist direction changing portion.

In order to eliminate this drawback, Japanese Patent Publication No. 44-30819 proposes a method of adding unidirectional twist to the obtained self-twisting yarn. Although this additional twisting method is an effective method, it sacrifices the high productivity that is a characteristic of self-twisting yarn. The inventors of the present invention have conducted intensive studies to solve these conventional drawbacks, and as a result, have arrived at the present invention.

The object of the present invention is to provide a self-twisted yarn in which the staples are sufficiently wound around the filament, the covering properties are good, and the staples do not fall off or move even if they are not additionally twisted. The goal is to provide a manufacturing method that can be used to manufacture products.

That is, in the first aspect of the present invention, a sheath yarn consisting of staples is twisted around a core yarn consisting of filaments, and 5ifi and z
In a self-twisted yarn in which two yarns with alternate twist are combined and the two yarns are integrated at self ##, $, at least one yarn has a core yarn with a fineness of It is composed of different filaments, with thick filaments located near the center and thin filaments arranged around thick filaments.

Furthermore, the gist is a self-twisting yarn in which sheath yarns are arranged on the outside.

In the second aspect of the present invention, two yarns are formed in which staples are attached to the filaments and alternate twists of S[ and Zfi are applied in the longitudinal direction of the yarns.

A method of manufacturing a self-twisting yarn by integrating these two yarns with each other by self-twisting, characterized in that a mixed filament consisting of filaments with different finenesses is used as the filament of at least one yarn. The gist is the law.

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

The self-twisting yarn of the present invention is a yarn in which a sheath yarn consisting of staples is wound around a core yarn consisting of filaments, and is a combination of two yarns having alternate twists of S twist and Z twist in the longitudinal direction. The two yarns are integrated by self-twisting and the twist of each yarn is stabilized, and the core thread of at least one yarn among the two yarns, preferably the The core yarn is composed of filaments of different fineness. The fibers used as filaments are usually synthetic fibers, and the single filaments that make up the filaments are generally of uniform fineness.

The same applies to filaments used in conventional self-twisting yarns. However, in the present invention, mixed filaments of different fineness are used as the filaments.

The yarn of the present invention, which uses mixed filaments of different fineness as the core yarn, is mainly made of thick filaments.

Fine filaments are arranged around it,
Furthermore, it shows a three-layer structure in which sheath threads made of staples are arranged on top of the sheath threads. It is a yarn with good curling properties in which the core filament is almost completely hidden, and the staples are extremely unlikely to fall off or move due to friction.

These yarn characteristics are reflected in the self-twisting yarn.

The reason for this is not clear, but it is probably because filaments with thinner fineness are twisted around filaments with thicker fineness when false twisting is applied in the manufacturing method described later, resulting in a triple-layered arrangement centered on filaments with thicker fineness. It is thought that the self-twisting becomes even stronger because the staples are easily fixed and entangled with the filaments of thicker fineness, and the untwisting torque of the filaments of thicker fineness is greater.

The filaments (single filaments) with different fineness used as the core thread of the yarn in the present invention are preferably 2 denier or more for large fineness and 1 denier or less for fine fineness. The filament may be a mixture of not only two types but also three or more types having different finenesses.

The self-twisting yarn of the present invention will be explained below using illustrated examples.

FIG. 2 is a side view of an example of a self-twisting yarn of the present invention, showing a single yarn composed of filaments and staples (
Yl) and another yarn (Yt) with exactly the same configuration are integrated by self-twisting and are S-twisted in the longitudinal direction (S).
and Z twist (Z) are formed, and this alternating twist is stabilized.

FIG. 3 is a cross-sectional view of an example of the self-twisting yarn of the present invention,
Two yarns (Y+) in which a thin filament (f) is arranged around a thick filament (F) in the center, and a staple (C) is arranged around it;
(Yt) constitutes one self-twisting yarn, and the staple (C) is entwined with a filament (f) of fine fineness.

In the self-twisting yarn of the present invention, filaments mainly made of synthetic fibers such as polyester or polyamide are used as the core yarn, and staples mainly made of natural fibers such as cotton or wool are used as the sheath yarn. Characteristics such as wearability and good texture of natural fibers.

It is possible to make a composite yarn that also has characteristics such as good moisture absorption.

Next, the present invention will be explained in detail.

First, a yarn is made by attaching staples to a filament and has alternating sl and z twists in the longitudinal direction of the yarn. At this time, the filament is a mixed filament consisting of two or more types of filaments with different finenesses. Use. A plain consisting of the above filament and staple.

When false twisting is performed without changing the length of the false twisting zone, alternating S twists and 2 twists are formed in the longitudinal direction of the yarn, and at the same time staples are wound around the filaments. Due to the twisting force during the above-described false twisting, the thicker filaments gather in the center of the yarn, the thinner filaments are arranged around the thicker filaments, and the outer staples are entwined with the thinner filaments. When two yarns formed in this manner are combined, the two yarns are integrated by self-twisting to obtain a self-twisted yarn with stable twisting. As mentioned above, this self-twisting yarn has good covering properties and is less likely to fall off or move staples.

In the above description, a case has been shown in which alternating twists are formed in a yarn consisting of filaments and staples, and staples are attached to the filaments at the same time, but the alternating twists may be formed after the staples are wound around the filaments in advance. Also.

The mixed filament may be three or more types. Furthermore, in order to combine two yarns to form a self-twisting yarn, it is preferable from the viewpoint of self-twisting that the twists of each yarn in the same direction are in the same phase or slightly out of phase with each other.

The manufacturing method of the present invention will be explained below based on illustrated examples.

FIG. 1 is a process schematic diagram showing an example of a method for manufacturing a self-twisting yarn according to the present invention. Two stable rovings (1).

(11' Haback Row 7 (61, Apron Roller (
7) Draft to a predetermined magnification using a draft zonin equipped with a front roller (8). On the other hand, the two filaments (2), (2)'' are combined with the staple rovings (1), (1)'' at the entrance of the front roller (8), and are placed in the false twist zone as yarns (31, (31'). In the false twist zone.

The yarn (
3), (3)' give false twist.

At this time, the twist caused by the false twisting body α propagates upstream and the staple roving is twisted around the filament.

In addition, by nipping or tying the yarn (31, (3)') with a breaking roller (9) that has a part of the peripheral surface cut out, the heated part of the false twist is periodically turned into a false combustion twisted body. 0
0) to the breaking roller (9) and the false twisted body t
The distance from tm to the front roller (8) is changed.

That is, the length of the false twist zone is changed. Therefore, the yarn (31, (31'' has S) passed through the false twisting body αQ.

Z alternating twists are introduced, and by combining both yarns at the guide 0υ, self-twisting is formed, resulting in one stable self-twisting yarn (4), which is passed through the delivery roller (formerly) and then through the winding roller (1). It is rolled up as cheese (5) through 4.

As described above, in the self-twisting yarn of the present invention, the core yarn of at least one yarn is composed of filaments 1 having different finenesses, and a filament with a thicker fineness is present in the center of the yarn,
There are filaments of fine fineness around it,
Since there is a sheath yarn consisting of staples adjacent to this thin filament, the yarn itself is prone to shedding of the staples.

There is little movement, and this is reflected in the self-twisting yarn, resulting in less staple drop-off and movement of the self-twisting yarn, and good covering properties.

In addition, in the manufacturing method of the present invention, a mixed filament consisting of filaments of different finenesses is used as the filament of at least one yarn, so when applying alternate twists in the longitudinal direction of the yarn, the filaments of thicker fineness are placed in the center and around it. It is capable of coordinating filaments of fine fineness and intertwining filaments of fine maturity with staples. Therefore, it is possible to obtain a self-twisting yarn with good covering properties and less staple dropout and movement without additional twisting as in conventional yarns.

It is possible to maintain high productivity.

The present invention will be specifically explained below with reference to two examples.

Example A self-twisting yarn was manufactured using the steps shown in FIG. 1 using cotton roving as the staple and polyester mixed filaments of different fineness as the filament. The cotton roving has a thickness of 120 gel/30 yards, and the polyester filament has a thickness of 5
0 denier/48 filament and 25 denier/
It was a mixed filament of 12 filaments and 25 denier/36 filaments. The cotton roving was drafted 32 times between the back roller and the front roller and then combined with the polyester filament, the surface speed of the false twisted body was 350 tn/min, and the winding speed was 1
The speed was 50m/min. The obtained yarn is S at 22cm intervals.
It was a self-twisting yarn of 4O3/2 in which li and z2 were repeated.

The number of twists in the S twist portion and the Z1 portion were each about 190 turns/m. When a knitted fabric was made from this self-twisted yarn and only the cotton was dyed with a direct dye, the polyester filaments were completely covered and no defects were observed in the zero-twisted portion. Moreover, there was less staple movement and less staple drop.

Comparative Example A self-twisting yarn was produced in the same manner as in Example 1, except that the polyester filament was a single filament having a uniform fineness of 50 denier/36 filaments.

When this yarn was made into a knitted fabric and dyed in the same manner as in Example 1, undyed polyester filaments were locally formed on the surface of the knitted fabric, resulting in poor covering performance. Moreover, the staples tend to move or fall off.

[Brief explanation of drawings]

FIG. 1 is a process schematic diagram showing an example of the method for producing the self-twisting yarn of the present invention, FIG. 2 is a side view of an example of the self-twisting yarn of the present invention, and FIG.
The figure is a cross-sectional view of an example of the self-twisting yarn of the present invention. In the figure, (Tl), (11" is a staple, +31.
+3)' number filament, (9) is the breaking roller,
αω is a false twisted body. (Y+), (Yt) is 7. (F)l
(L thickness) filament with fineness, (f) indicates filament with fineness, (C) indicates staple Patent applicant Unitika Co., Ltd.

Claims (1)

[Scope of Claims] (A yarn formed by combining two yarns in which a sheath yarn consisting of a stable is wound around a core yarn consisting of 11 filaments and having alternating S and Z twists in the longitudinal direction, In a self-twisting yarn in which the main yarns are integrated by self-twisting, the core thread of at least one yarn is composed of filaments of different fineness, with the filament of thicker fineness located near the center and the filament of finer fineness located near the center. A self-twisted yarn in which the filaments are arranged around a filament with a thick fineness, and a sheath yarn is further arranged on the outside. (2) A stable is wound around the filament, and S twist and Z# are arranged in the longitudinal direction of the yarn. A method of manufacturing a self-twisted yarn by forming two yarns with alternating twists of #, and combining the two yarns with each other by self-twisting, wherein filaments of different fineness are used as the filaments of at least one yarn. A method for producing a self-twisting yarn characterized by using a mixed filament consisting of.