JPS6142012B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to composite spun yarns. More specifically, the present invention relates to a composite spun yarn comprising an antistatic filament yarn in the core and a short fiber component in the sheath, and a method for producing the same.

It is well known that both synthetic fibers and natural fibers become electrically charged due to friction. Frictional electrification of synthetic fibers is particularly noticeable, and when dry in winter, clothing may cling to the body, sparks may be generated due to electrical discharge, and in severe cases, the user may receive a shock from the spark discharge, causing discomfort. Furthermore, it can become dangerous because it attracts dust and becomes dirty easily, or it can cause an explosion due to ignition.

In order to improve this problem, conventional methods have been to attach an antistatic agent to the fabric to give it an antistatic effect, or to include carbon-based fine particles or other conductive components in the polymer constituting the filament yarn.
Alternatively, an antistatic effect was provided by using carbon fiber as the filament yarn itself.

However, the method of attaching an antistatic agent has poor washing resistance and unsatisfactory durability, and the method of using filament yarn using a carbon component results in a black color or a gray color close to this. It was not possible to obtain the desired clothing products, and there were restrictions on product development. Therefore, even in the case of spun yarn, attempts have been made to incorporate black or gray antistatic fibers into the core, but a yarn with a complete core-sheath structure has not been obtained.

The present invention aims to solve the above-mentioned drawbacks and to provide an extremely high-grade and high-performance antistatic spun yarn, in which the conductivity is improved by using an antistatic filament with good electrical conductivity as a core component. Moreover, by twisting a spun component with good covering properties in the sheath part in a real twist shape, the covering property is improved and the purpose is to make any dyeing possible. This purpose is as follows: ``(1) A multilayer composite yarn consisting of a filament component and a short fiber component, in which the filament component is arranged in the core and the short fiber component is arranged in a real twist in the sheath, and the filament component is An antistatic composite spun yarn having antistatic performance, and characterized in that the mixing ratio of the antistatic filament component is 0.1 to 50% by weight of the total.

(2) When manufacturing a composite yarn consisting of a filament component and a short fiber component, the front top roller of a spinning machine with a draft mechanism is made into a stepped roller, and the draft is generated from the large diameter portion of the stepped roller and the front bottom shaft. On the other hand, antistatic filament yarn is sent out from the small diameter part of the stepped roller and the second top roller so that the mixing ratio is 0.1 to 50% by weight of the whole, and both are then spun. A method for producing an antistatic composite spun yarn, which comprises combining the filament yarns and twisting them while winding short fiber bundles around the filament yarns. ” This is achieved by

In the present invention, the antistatic filament component is
Any filament may be used as long as it is in the semiconductor/good conductor region with an electrical resistivity value of 10 ⁹ Ω·cm or less. For example, metal fibers such as stainless steel fibers, aluminum fibers, copper, silver, and gold, carbon chain bonded fibers such as carbon fibers, flame-resistant fibers, and graphite fibers, synthetic fibers such as nylon, polyester, acrylic, polyolefin, and carbon fibers. Refers to an antistatic type synthetic fiber filament in which black fine particles are uniformly dispersed partially or completely as viewed from the cross-sectional direction of the fiber. Such an antistatic type synthetic fiber filament can be obtained by uniformly blending carbon black or a composition containing carbon black as a main component with polyalkylene oxide in a polymer before spinning, or by spinning the mixture. A composition and a synthetic fiber as a core-sheath,
Obtained by spinning as a bimetallic, multicore core-sheath structure.

Further, other synthetic fiber filaments may be mixed therein as long as they contain the antistatic filament component described above. The antistatic filament components are determined by the presence or absence of crimping, fiber surface morphology, number of single fibers, fineness,
It may have any cross-sectional shape, thermal characteristics, etc.

Next, in the present invention, it is necessary to mix 0.1 to 50% by weight of the antistatic filament. If it is less than 0.1% by weight, the antistatic effect will not be achieved and this is not preferable. If it exceeds 50% by weight, the core will be exposed, which will impair the appearance of the product, which is undesirable. A particularly preferable range from the viewpoint of antistatic properties and product appearance is about 0.5 to 25% by weight.

The short fiber components of the present invention are natural fibers, synthetic fibers,
This refers to raw cotton for spinning made of these blended products, and the raw cotton may have any fineness, fiber length, etc. The short fiber component is arranged to cover the outer layer of the core filament component in the form of a real twist.

If such an example is shown in the drawings, FIGS. 4 and 5 show the composite spun yarn of the present invention. FIG. 4 is a cross section of the composite yarn, and FIG. 5 is a model diagram seen from the side. That is, the short fiber component 1 is wound in a real twist around the antistatic filament component 8 located at the core.
It is preferable that the single fibers constituting the short fiber component are oriented substantially in the direction of the short fiber thread. With this configuration, the covering properties of the core filament are improved, and since it is actually twisted, the covering strength is high, and it has resistance against straining and friction.

On the other hand, conventional composite spun yarns were made by pulling together and twisting, so they were as shown in FIGS. 2 and 3. i.e. filament 8
and staple 1 are compounded side-by-side, so when viewed from the side, filament yarn 8
appeared on the outside, and black, gray, etc. were conspicuous.

Next, a manufacturing method, which is the second aspect of the present invention, will be explained.

FIG. 1 shows one embodiment of the method of the present invention. First, the roving 1, which is a short fiber component, is supplied to the back rollers 3, 3' through the guide 2.
A desired draft is given between b and the front shaft 15 to form short fiber fleece 1'. On the other hand, the antistatic filament yarn 8 is sent out from the small diameter portion 5a of the front top roller and the grip portion of the second front top roller 6. Then, the short fiber fleece 1' is wound around the antistatic filament yarn 8 and twisted. The twisting is actual twisting.

The reason for this is that real twisting provides a clean coating, and that real twisting is easy to use when using a ring spinning machine.

The feeding speed of the short fibers is preferably 0.5 to 30% faster than the feeding speed of the antistatic filament yarn.
By doing this, the fleece 1' is overfed compared to the filament yarn, so
The filament yarn is coated by being evenly wrapped around it. If it is less than 0.5%, the proportion of exposed filament threads will be high, which is undesirable, and if it exceeds 30%, the short fiber component in the covering portion will become sagging, which is not preferred. Above all, the overfeed rate
The range of 0.5 to 30% is normal raw silk multifilament, woolly processed yarn, buleriya processed yarn, interlaced yarn,
This can be applied to filament yarns such as steam-jet curled yarns, and when the filament yarns exhibit elasticity, an overfeed ratio of 2 to 70% is preferable.

To further explain using Figure 1, 4,4'
1 is an apron roller, 9 is a filament yarn tension adjustment device, 10 is a yarn guide, 11 is a composite yarn,
12 is a snail guide, 13 is a travel guide,
14 indicates a winding bobbin. Note that the second top roller 6 and the front top roller 5 each require a nip mechanism, but these are omitted. Further, the small diameter portion 5a and the large diameter portion 6a of the front top roller 5 may be arranged on either side.

Further, in the method of the present invention, the point where the filament yarn 8 and the short fiber bundle fleece 1' join is preferably about 3 to 20 mm from the nip point of the short fiber bundle fleece. If it is at this level, the coverage will be improved. Further, it is preferable that the roller width of each of the large diameter portion 5b and the small diameter portion 5a is at least 5 mm or more. This is because even if the thread path deviates slightly, it will not easily deviate from the nip point.

Next, examples will be described.

Example 1 By the process shown in Figure 1, a composition containing 80% by weight of raw cotton (single fiber fineness 2d, 89 mm variable cut) made of polyethylene terephthalate as the short fiber component and carbon black as the main component as the antistatic filament component was prepared. “Antron” manufactured by Du Pont with nylon 6 in the sheath.
(Registered Trademark) Using 20% by weight of 25D-5fil,
An antistatic spun yarn with Nm=1/72 was obtained. The overfeed rate of the staple component was 5.0%. The twist coefficient was K=100 [T (T/m)=K√, T: number of twists]. The obtained yarn was an antistatic spun yarn with staples arranged on the surface as shown in FIGS. 4 and 5.

The spun yarn was used as a fabric, and the antistatic performance (friction withstand voltage) of the dyed and finished raw fabric was evaluated using a rotary static tester (rotor rotation speed:
400r.pm, calibrated applied voltage: 100V, cloth to be rubbed:
Cotton cloth, friction target cloth contact angle: 2mm, load: 500g,
Then, measure the charged voltage 60 seconds after the roller rotates). As a result, we obtained an extremely good result of 0.0010kV. Furthermore, a fabric with good surface quality was obtained, with no portions of the antistatic fibers appearing on the woven surface.

Example 2 2.5×89V raw cotton made of acrylonitrile 50
%, uniformly blended roving yarn of 50% merino wool, and antistatic filament yarn in woolly nylon 70D-24fil.
In combination with 20d−1fil aligned yarn, Nm=1/
48. Antistatic spun yarn for tights with twist coefficient K = 78 was made and knitted into tights. The mixing ratio of the antistatic filament was 10.5% by weight. Good results were obtained with no static electricity generated when worn. Further, as data supporting the wearing results, the frictional withstand voltage described in Example 1 was measured (however, the load was 7 g).
As a result, we obtained a very good result of 0.0013kV.

Comparative Example 1 The friction withstand voltage of tights made of 50% 2.5d×89V of acrylonitrile and 50% of merino wool and Nm=1/48 was 4.78 kV. Even when actually worn, there was some tangle with the skirt.

In addition, the frictional withstand voltage is 3.0 kV or less, which does not cause problems with clinging.

[Brief explanation of the drawing]

FIG. 1 shows one embodiment of the process for obtaining the composite yarn of the invention. FIG. 2 shows a cross section of a yarn made by the conventional covered spun method, and FIG. 3 shows a side view of FIG. 2. FIG. 4 shows a sectional view of the antistatic spun yarn of the present invention, and FIG. 5 shows a side view of FIG. 4. 1: short fiber component, 1': fleece, 3: back roller, 4: apron roller, 5: front top roller, 5a: small diameter part of front top roller, 5b: large diameter part of front top roller, 6:
2nd top roller, 7: front bottom shaft, 8: antistatic filament component, 9: tension adjustment device, 10: guide, 11: antistatic composite spun yarn, 12: snail guide, 13: traveler, 1
4: Winding bobbin.

Claims (1)

[Scope of Claims] 1. A multilayer composite yarn consisting of a filament component and a short fiber component, in which the filament component is arranged in the core and the short fiber component is arranged in the sheath in a real twist, and the filament component is It has antistatic performance and the mixing ratio of the antistatic filament component is
An antistatic composite spun yarn characterized by having a content of 0.1 to 50% by weight. 2. The antistatic composite spun yarn according to claim 1, wherein the short fiber component contains 0.1 to 10% by weight of antistatic fibers. 3. When producing a composite yarn consisting of a filament component and a short fiber component, the front top roller of a spinning machine having a draft mechanism is made into a stepped roller, and the yarn is drafted from the large diameter portion of the stepped roller and the front bottom shaft. A short fiber bundle is spun, and on the other hand, an antistatic filament yarn is sent out from the small diameter part of the stepped roller and the second top roller so that the mixing ratio of the whole is 0.1 to 50% by weight, and the two are combined. A method for producing an antistatic composite spun yarn, which comprises twisting a short fiber bundle while winding it around a filament yarn. 4. The method for producing an antistatic composite spun yarn according to claim 3, wherein the spinning machine is a ring spinning machine. 5. The method for producing an antistatic composite spun yarn according to claim 3, wherein the supply speed of the short fiber bundle is 2 to 70% faster than the supply speed of the filament yarn.