JPS5930925A - Antistatic composite spun 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 composite spun yarns. More specifically, the present invention relates to a composite spun yarn having 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 clothing clings to the body during dry winters, sparks may be generated due to electrical discharge.In severe cases, the electrical discharge may cause shock and discomfort. be. Furthermore, it is said that it is dangerous because it attracts dust, which makes it easy to get dirty, or 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 provide an antistatic effect, or to include carbon-based fine particles or other conductive components in the polymer that makes up the filament yarn.

Until now, carbon fiber was used as the filament yarn itself to provide an antistatic effect.

However, the method of attaching an antistatic agent has poor washing resistance and unsatisfactory durability, and the method of filament yarn using a carbon component results in black or a gray color close to this. It was not possible to obtain clothing products that matched this, 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 perfect core-sheath structure has not been obtained.

The present invention aims to solve the above-mentioned drawbacks and 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 into the sheath part in a real twist form, the covering property is improved and it is intended to enable harsh dyeing. What is this purpose?

(1) In a multilayer composite yarn consisting of a filament component and a short fiber component, the core contains a filament component,
The short fiber component is arranged in the sheath part in the form of a real twist, and the filament component has antistatic performance, and the mixing ratio of the antistatic filament component is 01 to 50% by weight of the whole. Antistatic composite spun yarn.

(2) When manufacturing a composite yarn containing a large number of filament components and staple fiber components, 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. The resulting short fiber bundles are spun.

On the other hand, the mixing ratio of the antistatic filament yarn from the small diameter part of the stepped roller and the second top roller is 01 to 5.
1. A method for producing an antistatic composite spun yarn, which comprises: combining the two pieces of feed 1 so that the weight ratio is 0, and twisting the filament yarn while winding the short fiber bundle around the filament yarn. ” This is achieved by

What is the antistatic filament component in the present invention?

Any filament may be used as long as it is in the semiconductor/good conductor region with an electrical specific resistance value of 109 grade/(2) or less. For example, stainless steel fibers, aluminum fibers, metal fibers such as copper, silver, and gold, as well as carbon fibers, flame-resistant fibers,
Carbon chain bonded fibers such as graphite fibers, nylon, polyester, and acrylic.

It refers to an antistatic type synthetic fiber filament, etc., in which fine carbon black particles are uniformly dispersed in a synthetic fiber such as polyolefin, partially or entirely, when viewed from the cross-sectional direction of the fiber. Such antistatic type synthetic fiber filaments can be obtained by uniformly blending carbon black or a composition containing carbon black as a main component and polyalkylene oxide in a polymer before spinning, and then spinning the mixture. Alternatively, it can be obtained by spinning the composition and synthetic fibers into a core-sheath, bimetallic, or multi-core structure.

Other synthetic fiber filaments may be mixed therein as long as they contain the antistatic filament component. The antistatic filament components include the presence or absence of crimp, fiber surface morphology, number of single fibers, and fineness.

It may have any cross-sectional shape, thermal characteristics, etc.

Next, in the present invention, the antistatic filament is 0.
It is necessary to mix 1 to 50% by weight. If the weight ratio is less than 0.1, it is not preferable to have an antistatic effect. If it exceeds 50% by weight, the core portion will be exposed and the appearance of the product will be impaired, which is not desirable. Antistatic property.

A particularly preferable range from the viewpoint of product appearance is approximately 0.5 to 25 weight.

The short fiber components of the present invention include one natural fiber and one synthetic fiber.

The raw cotton for spinning made of these blended products is shown, and the raw cotton 61 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.

Such an example is shown in the drawings, and 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 as seen from the side. That is, the short fiber component 1 is wound in a real twist around the antistatic filament component 80 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 filaments are improved, and since they are actually twisted, the covering strength is high, and the core filaments have high resistance against straining and friction.

In contrast, conventional composite spun yarns were made by pulling together and twisting, so they were as shown in FIGS. 2 and 3. Since the filament 8 and the staple 1 are combined in a side-by-side manner, when viewed from the side, the filament thread 8 appears on the outside, and therefore the color is black.
The gray color was noticeable.

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. 1
First, the roving 1, which is a short fiber component, is supplied to the back roller filter 3' through the guide 2, and a desired draft is created between the back roller 6, 6', the large diameter portion 5b of the front top roller 5, and the front shaft 15. Give.

It is called 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 gripping portion of the second front top roller 6. Then, a short fiber fleece 1' is arranged around the antistatic filament thread 8.
The method involves twisting the material while wrapping it around the material. 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 supply speed of the short fibers is preferably 0.5 to 30 times faster than the supply speed of the antistatic filament yarn.

By doing this, the fleece 1' is overfed compared to the filament yarn, so that it is uniformly wrapped around the filament yarn and coated. If the ratio is less than 05, the exposed ratio of the filament threads will be high, which is undesirable, and if the ratio exceeds 30, the short fiber component in the coated portion will become sagging, which is undesirable. However, the range of the overfeed rate of 0.5 to 30% is ordinary raw silk multifilament, woolly processed yarn, bulerilla processed yarn, and interlaced yarn.

This can be applied to filament yarns such as steam jet knit yarns, and when the filament yarns are elastic yarns, an overfeed ratio of 2 to 70 is preferable.

To explain further using FIG. 1, 4 and 4/ are apron rollers, 9 is a filament thread tension adjustment device, 10 is a yarn guide, and 11 is a composite yarn.

12 is a snail guide, 13 is a traveler guide.

14 indicates a winding bobbin. Note that the second top roller 6,
Each of the front top rollers 5 requires a nip mechanism, but this is omitted. Also, the small diameter portion 5 of the front top roller 5
a and the large diameter portion 6a may be arranged on either side.

9- Furthermore, 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 m+n from the nip point of the short fiber bundle fleece. If it is at this level, the coverage will be improved. Also, the large diameter portion 5b and the small diameter portion 5a
The width of each roller is preferably at least 5 mm. This is because even if the yarn path is slightly deviated, it will not easily deviate from the nip point.

Next, an example will be described.

Example 1 Raw cotton (single fiber fineness 2d, 89
mm barrier pull cut) 80% by weight.

"Antron ■" (registered trademark) manufactured by Du Pont, which has a composition mainly composed of carbon black as an antistatic filament component and a sheath made of nylon 6.
Using 20% by weight of 25D-5fig.

An antistatic spun yarn with a count of Nm = 1/72 was obtained. The overfeed rate of the staple component was 50 parts.

The twist coefficient is = 10n (T (T/m) = xf field.

10-T: Number of twists] Toshida. The obtained yarn was an antistatic spun yarn as shown in FIGS. 4 and 5, which had star pulls arranged on its surface.

The spun yarn was used as a fabric, and the antistatic performance (frictional withstand voltage) of the dyed and finished raw fabric was evaluated using a rotary static tester (rotor rotation speed: 400 r, p, m).
, Calibration applied pressure voltage: ID0V, Friction target cloth: Cotton cloth,
Contact angle of surface to be rubbed: 2 mm, load = 500 g, and the charging voltage was measured 60 seconds after the binding roller rotated). As a result, 0
．． Very good results were obtained with a voltage of 0.0010 kV. Furthermore, a fabric with good surface quality was obtained, with no portions of the antistatic fibers appearing on the woven surface.

Example 2 Uniform blended roving of 50% 2.5 x 89V raw cotton made of acrylonitrile and 50 inches of merino wool.

Nm=1748 in combination with woolly nylon 70 D-24fil and yarn made of antistatic filament yarn 2D d-1fig. Antistatic spun yarn for tights with a twist coefficient of -78 was made and knitted into tights. The mixing ratio of the antistatic filaments was 10.5% by weight. Good results were obtained with no static electricity generated when worn. The friction withstand voltage described in Example 1 was measured in order to confirm the results of wearing the garment (with a load of 7 g). The result was 0.0013 kv, which was an extremely good result.

Comparative Example 1 2, 5 t3. consisting of acrylonitrile. x 89
Nm consisting of V 50 and 50% merino wool =
The frictional forward voltage of 1/48 tights is 4.78 kv.
Met.

Even when actually worn, there was some smearing with the skirt.

In addition, the friction withstand voltage is not a problem due to stickiness.
It is below OkV.

[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 1'2 fleece 3: Back roller 4: Apron roller 5: Front top roller 5a: Small diameter portion 5b of front top roller = Large diameter portion of front top roller 6: Second top roller 7: Front bottom shaft 8 : Antistatic filament component 9: Tension adjustment device 10 Ni guide 11: Antistatic composite spun yarn 12 Varnish nail guide 16: Traveler 14: Winding bobbin Patent applicant Azuma Shi Co., Ltd. 13-Moro Chumanl

Claims (5)

[Claims] (1) In a multilayer composite yarn consisting of a filament component and a short fiber component, the filament component is arranged in the core part and the short fiber component is arranged in the sheath part in a real twist, and the filament component has antistatic performance. An antistatic composite spun yarn characterized in that the antistatic filament component has a mixing ratio of 01 to 50% by weight. (2) Claim (1) characterized in that the short fiber component contains 0.1 to 10% by weight of antistatic fibers.
The antistatic composite spun yarn described in . (3) 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 created from the large diameter portion of the stepped roller and the front bottom shaft. The resulting short fiber bundles are spun. On the other hand, the mixing ratio of the antistatic filament yarn from the small diameter part of the stepped roller and the second top roller is 01 to 5.
1. A method for producing an antistatic composite spun yarn, which comprises combining the two pieces of feed 1 so that the filament yarn is 0% by weight, and twisting the filament yarn while winding the short fiber bundle around the 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) Production of an antistatic composite spun yarn according to claim (3), wherein the supply speed of the short fiber bundle is 2 to 70 cm faster than the supply speed of the filament yarn. Method.