JPS63275736A - Composite spun yarn having sheath-core structure and its production - 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 (Industrial Application Field) The present invention relates to a composite spun yarn in which sheath fibers are heated and wound around a core fiber, and particularly to a strong spun yarn in which aromatic polyamide fiber is used as the core fiber. Specifically, the disadvantages of aromatic polyamide fibers are compensated for by completely covering aromatic boria-based fibers with appropriate staple fibers selected from natural fibers and/or synthetic fibers. This invention relates to a composite spun yarn with a core-sheath structure that can significantly expand the range of applications.

(Conventional technology) Traditionally, aromatic polyamide fibers have been used as high-strength organic fibers for ropes, cables, safety fabrics, coated base fabrics, etc.
It is highly regarded as being suitable for various industrial uses. However, although the aromatic polyamide fibers have characteristics such as high strength, high cutting strength, and heat resistance, they also have disadvantages, which are a major hindrance to expanding their use. In other words, aromatic polyamide fibers are prone to discoloration and fading, and it is unavoidable that discoloration occurs immediately when exposed to the outside air.As a result, development of applications tends to be limited to industrial use, and is generally difficult to develop. The reality is that this is not acceptable.

Therefore, the idea was to cover the aromatic polyamide fiber with other fibers to solve the above-mentioned problem of discoloration and fading. However, this composite thread cannot be used as a conventional ring traveler.
Even if an attempt is made to manufacture it by a method, it is impossible to obtain the desired aromatic polyamide fiber that is completely covered, or even if it is possible, it is extremely difficult, and there are various problems in spinning. is accompanied by

(Problems to be Solved by the Invention) In the above-mentioned composite spun yarn having a core-sheath structure, it is a fatal problem that the aromatic polyamide fiber in the core portion is not completely covered and a bare portion remains. That is, when such a composite spun yarn is made into a woven fabric, the bare parts are exposed in some places and even if dyed, these bare parts remain undyed, resulting in a severe loss of commercial value. Therefore, in order to achieve good dyeing, it is necessary to use a two-bath dyeing method, but this is tedious and requires a lot of time.

Therefore, in spinning this composite spun yarn, the present inventors
It has been found that it is appropriate to employ the DREF method as a means for completely and strongly covering the aromatic polyamide fibers in the core. This DREF method is described in Japanese Patent Application Laid-Open No. 56-58218, and it is certain that it has a remarkable effect in producing all kinds of composite spun yarns due to its mechanism. It was extremely difficult to spin a composite yarn in which the aromatic polyamide fiber in the core was nuclided. That is, when the core fibers and sheath fibers are supplied through their respective supply paths to a pair of suction drums that are the yarn forming section, there is a deviation in the overlapping state of the core and sheath fibers, as shown in FIG. If this occurs, sufficient coverage becomes impossible, and the resultant product is a defective composite yarn with many bare parts.

The present invention makes full use of the characteristics of aromatic boria fibers, such as high strength and high cutting strength, and completely and strongly combines them with fibers selected from natural fibers and/or synthetic fibers. The object of the present invention is to provide a composite spun yarn with a core-sheath structure that solves the problem of discoloration and fading by coating with staple fibers and can be dyed well in a one-bath dyeing method, and a method for producing the same. be.

(Means for solving the problems) In order to achieve the above object, the composite spun yarn of the present invention has the following configuration. That is, it is a composite yarn with a core-sheath structure obtained by the adsorption heating method of the open-end spinning method, in which the core is formed of aromatic polyamide fiber filaments or spun yarn, and the core is made of natural fibers and/or spun yarn. or by covering it with synthetic fiber staples to form a sheath,
And its abrasion strength is JI8 L 1095 7.
The gist of this is that it is 110 or more in the 10.2B method. The second invention is an optimal manufacturing method for obtaining the composite spun yarn having a core-sheath structure according to the invention,
When producing a composite spun yarn with a core-sheath structure in which a core made of aromatic polyamide fiber filaments or spun yarn is covered with natural fiber and/or synthetic fiber staples,
The sheath fibers are transferred from the covering fiber drawing mechanism, and the core fibers are transferred from the core fiber supply path to the merging guide placed just before the front row 2- of the drawing mechanism, and then both f#! After adjusting the diameter of the overlapping state of the fibers, the threads are continuously supplied, and then the threads are fed between two parallel suction drums that rotate in the same direction in close contact with each other, and a thread pull-out roll consisting of a plurality of rolls is arranged and arranged. Let them pass sequentially, JIS
L 1095 7. The purpose of this invention is to produce a composite yarn having an abrasion strength of 110 or more in the IO, 2B method.

(Function) As mentioned above, the composite spun yarn of the present invention has a complete and strong coating with no bare parts, and its abrasion resistance is remarkable, so that the sheath part is not peeled off during boat work. There is no need to store it away, and the one-bath dyeing method allows for beautiful dyeing without unevenness. However, by employing the above-mentioned DaEF method and using the unique manufacturing method of the present invention, the composite spun yarn with the excellent core-sheath structure of the present invention can be obtained.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

(Example) FIG. 1 is an explanatory diagram showing an example of a composite spun yarn having a core-sheath structure according to the present invention. In the figure, (1) is an aromatic polyamide tm as a core fiber, and m1 (2) is a staple fiber of a sheath portion, which is appropriately selected from natural fibers and/or compound fibers.

First, the method for producing composite spun yarn of the present invention will be explained based on FIGS. 2 and 8, which show an example of an apparatus for carrying out the method. In these figures, (3) is a drawing mechanism for sheath fibers, that is, rovings, which is composed of a plurality of pairs of rolls having a circumferential speed that increases in the yarn running direction. The stretching mechanism (
A sheath fiber guide (4) is disposed immediately in front of each of the plurality of roll pairs in 3). However, the fiber bundle such as a sliver drawn out from the can 0 is transferred to the drawing mechanism (3).
and the sheath fiber guide (4).
It is supplied to the merging guide (6) just before the front roller (6).

On the other hand, the aromatic polyamide fiber fitments or spun yarns, which are the th line fibers 1), are supplied to the above-mentioned merging guide (6) via the core fiber supply path (7) and the core fiber guide (8). It has become.

On the extension line of the stretching mechanism (3), two parallel suction drums (9) that are close to each other and rotate in the same direction are arranged in parallel, and the cores supplied to the merging guide (6) are arranged in parallel. The fibers (1) and sheath fibers (roving) (2) are separated by a front roller (
Immediately after leaving the nip point of step 5), the core fiber (1) and the K-sheath fiber (2) are sucked by the suction drum (9) and heated by the rotation of the suction drum (9). is wrapped.

The yarn thus formed is pulled out in parallel to the axis of the suction drum (9) by a yarn pull-out roll αQ.

Furthermore, in the above-mentioned device, a core fiber guide (8);
At least one of the sheath fiber guides (4) can be positioned perpendicularly to the thread running direction. The core fiber (
1) and sheath fibers (2) are stacked in an optimal shape and then sent to the front roller (5).The structure is as follows: (2) The core fiber guide (8) is By adjusting the sheath fiber guide (4), the sheath fibers (2) can be connected to the merging guide (6) according to the position of the 8 fibers m(1) supplied to the merging guide (6). ); ■) The sheath fiber guide (4) is fixed, and the core fiber guide (4) is fixed.
8), the position of the core fiber (1) on the merging guide 6) can be adjusted according to the position of the supplied braided fibers m (2); and ■) the core fiber guide. (8) and the sheath fiber guide (4), the position of the core fiber (1) in the merging guide (6) and the sheath fiber (
2) Adjusting the supply position. There are eight methods, and an appropriate selection is made from these.

After conducting and comparing the above 8 configurations, configuration ■]
The best method is to adjust the supply position of the sheath fiber (2) by adjusting the position of the sheath fiber guide (4) according to the position of the core fiber (1) supplied to the merging guide (6). It was easier and more certain. Furthermore, it is natural to make subtle adjustments [
This is made possible by the configuration of C].

That is, the core fiber guide (8) and the sheath fiber guide (4)
It is preferable to make both positions adjustable, since all of them can be implemented and the best form can be selected depending on the situation.

As described above, various known means may be used as a mechanism for attaching the guide (4) l (8) in a position adjustable in a direction perpendicular to the thread running direction. For example, the fourth
A guide (4) using bolts and nuts as shown in Figures (4) and ■? Install a bolt (6) in the hole for attaching (8) to the machine base (B), and then tighten the bolt (6) to the nut (to).
By appropriately tightening the guide (4)
.

(8) 1 is one in which the position can be adjusted in the direction perpendicular to the thread running direction (indicated by the arrow).

In addition, regarding the sheath fiber guide (4), the drawing mechanism (3)
Although they are arranged at multiple locations in the area, eight locations in this example, it is not necessary for all of them to be adjustable in position as described above, and only the one in front of the merging guide (6) can be adjusted in position. By doing so, you can obtain sufficient effects.

In the present invention, the natural fiber of the sheath section refers to cotton, wool, linen, etc., and the synthetic fiber am refers to polyester.

Indicates polyamide, acrylic fiber, rayon, acetate, etc. When selecting sheath fibers from among these, it is preferable to consider the purpose of the present invention and select those that do not cause problems of discoloration and fading, and those that have excellent dyeability.

In addition, abrasion strength is based on JIS L 1095 General spun yarn test method 7.10 Abrasion strength 7.10.2 B method.
Using a yarn abrasion tester as shown in Fig. 7, a sample (yarn) was placed in the tester at 2 gf/lex (0,0196N/t).
An installation test was conducted under the following conditions with a load of ex) applied, and the value is expressed as the number of reciprocating frictions required until the sheath fibers wear out due to friction and the core fibers appear on the surface.

Friction speed: 120 times/min Friction angle: 110 @ Reciprocating distance: 2.5 cm Test length: 20 cm Friction element φQ, 6 nm hard steel The above test is repeated 1 (11 times) and the average value is taken.

(Specific example 1) Core fiber: aromatic polyamide fiber filament 200
d 80% Sheath is fiber...Ester staple Fineness 1.8 Fiber length 8
8m/m70% A composite spun yarn having the above structure was manufactured by the manufacturing method of the present invention, and the abrasion strength test described above was conducted.

In addition, as a comparison row, a composite yarn with a similar two-layer structure was used as D
The fibers were manufactured using a conventional manufacturing method using the BEF method, ie, a manufacturing method without providing a means for adjusting the overlapping state of core fibers and sheath fibers in the merging guide immediately before the front roller.

The table below shows the results of a test conducted on samples from each of the two locations.

(Specific example 2) Core fiber: aromatic polyamide fiber spun yarn 20'86
% Sheath fiber...Cotton staple Fineness 4.6 Fiber length 81m/
m65% The same test as in Example 1 was conducted on the composite spun yarn having the above structure. Incidentally, the spun yarn mentioned here refers to one made of staple fibers of aromatic polyamide fibers.

Seventy fa fruits are shown in the table below.

As is clear from the nine results shown in the two specific examples above,
The composite spun yarn of the present invention has an abrasion strength of 110 or more due to the unique manufacturing method of the present invention, whereas conventional composite yarns with an abrasion strength of 110 or without grooves have an abrasion strength of 110 or more during weaving. Problems such as peeling of the sheath fibers cannot be avoided. However, the composite spun yarn obtained by the present invention is a yarn that has no bare parts at all, does not exhibit unevenness on the surface even when woven, and can be easily and beautifully dyed using a one-bath dyeing method. Abrasion strength is 110 or more, preferably 120 or more, more preferably 1
80 or above.

M
As a result, there was no unevenness in the exposed core fibers on the surface, and an extremely superior strong woven fabric was obtained.

(Effects of the Invention) As described above, the composite spun yarn with a core-sheath structure of the present invention uses an aromatic polyamide fiber in the core, and takes advantage of the characteristics of the fiber such as high strength, high cutting strength, and heat resistance. While this is in the sheath f
It is an extremely excellent composite yarn that eliminates defects such as discoloration and fading by completely and strongly covering it with IL and m. Moreover, the completeness and strength of the coating obtained by the unique manufacturing method are remarkable, and it can be dyed evenly in one bath dyeing method, and it can be dyed evenly by one-bath dyeing method, and it can be dyed evenly by the friction during hair pricking. There is no possibility that the perforated core fibers will be exposed. However, it is used not only for industrial purposes but also for general items that require strength and aesthetic beauty, and its effects are further demonstrated.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example of a composite spun yarn with a core-sheath structure according to the present invention, Fig. 2 is an explanatory diagram of its manufacturing equipment, and Figs. 8 and 4 are enlarged views showing the main parts of the equipment. 6 and 6 are explanatory diagrams showing the state of the yarn just before passing through the front roller,
FIG. 7 is an explanatory diagram of the test method. (1) Core fiber, (2) Sheath fiber, (3)...
・Stretching mechanism, (4)...sheath fiber guide, (4a)・
・・A road, (5) ・・Front roller, (6)
... Merging guide, (7) ... Core fiber supply path, (8
)... Core fiber guide, (8a)... Thread guide, (9)
...Suction drum, αQ... Thread pull-out roll,
(b)... Machine base, (6)... Bolt,
(To)...Natsuto, 0...Kens. Figure 4 Figure 5 161 Figure 7

Claims (3)

[Claims] (1) A composite yarn with a core-sheath structure obtained by the adsorption heating method of the open-end spinning method, in which the core is formed of aromatic polyamide fiber filaments or spun yarn,
The core is covered with staples of natural fibers and/or synthetic fibers to form a sheath, and its abrasion strength is determined according to JI
A composite spun yarn having a core-sheath structure, characterized in that it has a core-sheath structure of 110 or more in the SL10957.10.2B method. (2) When producing a composite spun yarn with a core-sheath structure in which a core made of aromatic polyamide fiber filaments or spun yarns is covered with staples of natural fibers and/or synthetic fibers, the sheath fibers are used as coating fibers. From the drawing mechanism, the core fibers are passed from the core fiber supply path to a merging guide disposed immediately before the front roller of the drawing mechanism, through a means for adjusting the overlapping state of the two fibers in the merging guide. The threads are continuously supplied to each other and passed sequentially between two parallel suction drums that rotate in the same direction in close contact with each other, as well as through a pull-out roll consisting of a plurality of rolls.
10957.10.2 A method for producing a composite spun yarn having a core-sheath structure, the method comprising producing a composite yarn having an abrasion strength of 110 or more in the B method. (3) The means for adjusting the overlapping state of core fibers and sheath fibers in the merging guide includes a sheath fiber guide disposed in the stretching mechanism for covered fibers and a core fiber guide disposed immediately before the merging guide. The core-sheath structure according to claim 2, wherein the core-sheath structure is adjusted by the mutual position with the guide, and the position of at least one of these guides is adjustable in a direction perpendicular to the yarn running direction. A method for producing composite spun yarn.