JPS61266627A - Composite yarn - 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 Field of Application The present invention relates to composite yarns having strength and elongation properties of one or more levels, in which high-strength yarns are folded into composite yarns, and are used for knitting and elongation. It is a composite yarn with strong elongation characteristics that does not elongate during weaving, but begins to elongate when subjected to greater tension, and then once a certain elongation is reached, it regains high tensile strength and does not elongate any further.

More specifically, the outer layer is covered with short fibers, and the inner layer has a low tenacity yarn as a core yarn and a high tenacity yarn forming a loop in an intertwisted or alternately twisted state, and is substantially slack. This feature allows it to meet a variety of needs, including sewing thread, knitting thread, weaving thread, industrial material, and clothing thread.

BACKGROUND OF THE INVENTION Conventionally, undrawn yarns, spandex core yarns, and the like have been known as yarns that begin to elongate when tension is applied, exhibit high strength after elongating to a certain extent, and do not elongate any further.

However, when these threads are used as industrial materials such as sewing threads, knitting threads, or weaving threads, even the slightest force causes deformation, which not only makes it difficult to obtain sufficient processability, but also makes the finished products suitable for industrial materials. There was a problem that the product could not withstand sufficient tension and was deformed before it could perform as a product.

On the other hand, there are loop yarns, which have loop-like slack, but these yarns are designed for their texture and appearance.These loops are formed from staples, and are used as sewing threads and weaving threads for industrial materials. It was difficult to use due to its shape.

Problems to be Solved by the Invention From this point of view, the present invention has been developed to provide a composite yarn with internal (200% strength and A high-strength yarn is arranged with a stretchable core yarn and a loop-shaped slack entwined with the core yarn, and the outer layer is made to prevent the loops from coming out and to minimize bulk, while also preventing slippage between the core yarn and the loop yarn. This eliminates poor workability and defects caused by loops during sewing, knitting, and weaving.

Furthermore, depending on the conditions of use, short fibers with properties such as water absorption and water repellency are used, or they are subjected to post-processing to provide industrial composite yarns suitable for various uses.

Means for Solving the Problems The present invention is a spun yarn in which a plurality of yarns with different strength characteristics are covered with short fibers, and inside the yarn, a low tenacity yarn is used as a core yarn, and a high tenacity yarn forms a loop. It is a composite yarn characterized by being substantially slack.

In the structure of the present invention, first of all, it is necessary that the core yarn, which is a low-strength yarn, is intertwined with a high-strength yarn in a loop shape, and that the core yarn is substantially slack.

Here, the low tenacity yarn is generally spun yarn or tsuitsuta.
The material used varies depending on the application (= weather resistance, acid resistance, heat resistance, etc.), and its strength and elongation characteristics also differ, and there are special uses such as spandex, but the maximum strength is determined by the strength during knitting and weaving. (A value of 7001 or higher is preferable to prevent double thread breakage. A value of /Kf or higher is preferable especially for industrial materials that are subject to loads. The strength is, of course, set lower than that of high-strength yarns.

High-strength yarns are generally used (including bisynthetic fibers, engineering plastic fibers, aramid fibers, carbon fibers, boron fibers, ceramic fibers, metal fibers, and their composite yarns, so that they do not break easily even under high tension.

In addition, giving the fiber functions such as heat generation and conductivity is also useful (think about it in terms of usage).It is particularly effective for drying concrete and antistatic measures for fabrics.

Next, it is necessary that the high-strength yarn is entangled with the low-strength yarn ζ of the core yarn in a loop-like manner, and the intertwined state may be either an intertwisted state or an alternately twisted state. The slack rate of this loop can be set in various ways depending on the application, but it is usually t.
S~3θθchi is used.

This sagging rate can be easily adjusted by creating snarls in the high-strength yarn in advance, entangling it with air, or creating a loop shape (double entanglement) with the open end of the rotor set.
Although it can be made larger, j% to 200% is preferable because it causes poor shape such as misalignment with the core yarn and bulkiness. Furthermore, functional fibers (preferably 90 to 20 θ).Low tenacity yarns and high tenacity yarns may be composed of a plurality of spun yarns or filaments, and may be composed of various functional fibers depending on the use and conditions. be able to.

Further, at this time, by constructing the low tenacity yarn with short fibers that exhibit shrinkage ability, the elongation of the composite yarn of the present invention can be further increased after heat treatment.

The second point is that the outer layer is covered with short fibers. Yarns with large design effects, such as those found in general loop yarns, in which the loops protrude outwards have a problem in that they not only have very poor workability in sewing threads, weaving threads, or knitting threads, but also cannot be processed.

Book: In the composite yarn of the invention, the loops are covered with outer layer fibers to prevent them from coming out too much, and they are also covered with outer layer fibers to prevent them from becoming bulky. ) To prevent changes, 1: It is necessary to tighten the inside with the outer layer fiber.

This constricting state can be done by wrapping the short fibers completely (two times) or by wrapping them in a spiral loop.Also, in addition to the short fibers, the loop may be partially wound with filament. , designed so that its absolute strength does not exceed that of high-strength yarn.

The short fibers used here provide stronger binding (:,
Fibers having a shrinkage function are preferred, and shrinkage fibers having a shrinkage of ♂ arrogant to ♂ 0 depending on the loop state 1 are preferred.

Furthermore, a filament can also be used in combination.

Further, in order to strengthen the bundle, it is also possible to use an air vortex process or a method of rubbing with a rotating body or the like.

The content ratio of this shrinkable fiber in the composite yarn is /θchi~
It is about 0 staff, and 2J' is required for complete coverage.
4 or more is preferable.

The present invention is characterized by the use of the core yarn, loop yarn, and outer layer fibers to achieve complex strength and elongation characteristics.

Next, the characteristics of the composite yarn of the present invention will be explained with reference to FIG.

FIG. 1 shows the SS curve of the composite yarn of the present invention, which uses acrylic fiber spun yarn for the core yarn, ester multifilament for the loop yarn, and acrylic fiber for the short fibers of the outer layer.

The composite yarn of the present invention has two major strength and elongation curves, and when a strength of about 3001 is applied to this yarn, it begins to elongate i.
It stretches relatively easily up to K4, and the core yarn breaks when it stretches to 4tJ''.Next, there is a partial decrease in strength, but the high-strength yarn continues to contribute strongly, and the subsequent elongation is , 2 o'clock, j, ! section, ! edge has relatively little elongation of 76, and further deformation can be suppressed to a small level.

Here, various low-strength yarns, high-strength yarns, and sag ratios are selected depending on the application.j$1=Thus, for example, (A) sag ratio is /! It has a large θ coefficient and exhibits extremely large elongation deformation.

(B) A yarn with little elongation and deformation after being greatly elongated and deformed using metal fibers in a high strength system.

Composite yarns with S-S curves can be created for various uses and purposes.

In the present invention, if only low tenacity yarn and high tenacity yarn are used, the high tenacity yarn has large loops and cannot be used as sewing, knitting, or weaving yarn because it loses its shape, shifts, is bulky, has unevenness, etc., so the outer layer is with short fibers.

Cover. Generally, filaments are often used for high-strength yarns due to their strength and bulkiness, and when the core yarn is a filament (the second one generally has the disadvantage of being easily misaligned).

Therefore, it is preferable to use spun yarn, spun yarn and filament, or filament-processed yarn as the core yarn, and it is preferable to cover the outer layer fiber with staple fiber or a mixture of staple fiber and filament.

The method for producing a composite yarn according to the present invention uses a shrinkable spun yarn as a core yarn, and after twisting it with high-strength filaments, it is coated with short fibers that have shrinkage properties by a method to create a core yarn or a two-layer yarn. After that, the core yarn and outer layer fibers are shrunk using steam or boiling, or the core yarn is over-fed with high-strength filaments and twisted or alternately twisted in a loop or spooled state. There is a manufacturing method in which the fibers are processed into a loop shape and then covered with short fibers. Similarly, short fibers having shrinkage ability can also be used.

It is preferable to cover the short fibers continuously with the above-mentioned combination of the core yarn and the high-strength yarn, but it can also be carried out separately.

An example of the form of the composite yarn of the present invention obtained by the above manufacturing method will be explained as a model with reference to FIG.

Figure 2 (al) is a composite yarn in which short fibers 3 cover the outer layer of a core yarn (spun yarn) 1 and high-strength yarn (filament) 2 wound in a twisted manner, and the high-strength yarn 2 is spirally wound. It is characterized in that it is wound around the core yarn 1 in a shape, and that a loop exists between the core yarn 1 and the short fibers 3 of the outer layer 1- as if it were contracted.

The yarn surface is homogeneous and good.

Figure 2 (b) shows a composite yarn in which short fibers 3 incompletely cover the outer layer of a core yarn (spun yarn) 1 and high-strength yarn (filament) 2 wound in an alternately twisted manner. Yarn 2 is S twist and 2
It is wound in a loop shape with alternating twists, and the short fibers 3 are wound around the loop and have a yarn structure in which it is tied. This composite yarn has a high-strength yarn with an alternating twist of S twist and 2-twist, so it is a yarn with low torque, and the high-strength yarn has a high sag rate, and it is completely free when stretched. Because it is twisted, it is suitable for applications with high elongation, unlike the composite yarn (a).

This form is also suitable for special applications where spandex is used as a core yarn.

Example / High shrinkage (0%) of acrylic synthetic fiber in low tenacity yarn (core yarn)
%) type spun yarn of //2 T/m was used, and the high tenacity yarn was a 20θOd multifilament of ester-based synthetic fiber, and these were combined to produce /20 T/m.
The yarn was twisted to make a mixed yarn.

Next, after coating the intertwisted yarn with short fibers with different shrinkages: ■ boiling shrinkage rate ko, j%, ■ boiling shrinkage rate g θ, respectively, the resulting composite yarn was steamed (700°C x 70 minutes).
We conducted a comparative study on its form and performance. The results are shown in Table 187.

For those using short fibers with shrinkage rates C and J shown in Table 1, as the core yarn shrinks and the bulkiness increases, the outer layer also swells and the tightening condition deteriorates.

Then, the inner and outer layers and the filament slipped.

The yarn surface was also deteriorated due to its uneven surface, and the weavability was poor. On the other hand, if the shrinkage rate in (2) is too high, the outer layer will shrink in response to the shrinkage of the core yarn, so the bulkiness will be small, and the core yarn, high-strength yarn, and outer short fibers will It was good with no slippage. In addition, the yarn surface and weavability were good, and the object of the present invention was fully achieved.

In addition, as a result of manufacturing a weft drain using this composite thread, it was possible to improve soft ground (as the ground deforms, it follows the topography when pressure is applied, and the consolidation settlement can be performed smoothly without expanding the diameter). This enabled us to improve the ground and reduce the time required.

Example 1 A spun yarn made of polyolefin fiber ///θNm was used as a low tenacity yarn (core yarn), and the following (Unister synthetic fiber 2
000d is fed as shown below, subjected to false twisting, and wound in an intertwined state in the core yarn C2S and z directions, and then coated with short fibers with different shrinkage capacities to form a composite yarn. Manufactured.

Each sag rate (overfeed rate)! , /θ,
jθ, 100, / 0.30θ When short fibers with boiling shrinkage of less than j1 are used, this alternate twisting method has a small sag ratio of t/1, no slippage inside and outside, and strong elongation. The elasticity properties were also good, but when the sag ratio exceeded 50, the bulkiness increased and the yarn surface deteriorated.

On the other hand, short fibers with boiling shrinkage of 0% have low bulk and are good even with a sag ratio of 300% (
- It could be coated and the weavability was good.

In addition, when this yarn was placed into a pipe with large incisions on the top and bottom of the bag, and then filled with a cement-based injection agent, the bag swelled out through the pile incisions. It was found that it can be used satisfactorily as an anchor to stabilize the road bed.

Effect of the invention The present invention exhibits the following remarkable effects.

(1) The high-strength yarn is a core yarn with a low-strength yarn and is looped loosely, but since the bulkiness of the loop is suppressed in the outer layer, the initial tension is higher than that of conventional processed yarns, making it easy to sew. , less elongation during knitting and weaving, improved workability, and made it possible to provide stretchable yarns suitable for various uses.

(2) It can follow the deformation of the ground and is effective as a compaction expansion pack drain thread.

(a) Also, as a vegetation sheet, it can adhere closely to uneven ground.

(4) As a weft for tire reinforcing fabrics, it can also be used to follow large deformations during tire molding and maintain high strength thereafter.

(5) It can also be used as an anchor to stabilize the roadbed.

[Brief explanation of the drawing]

FIG. 1 shows an example of the SS curve of the composite yarn of the present invention. Fig. 2 is a model diagram showing an example of the form of the composite yarn of the present invention. This is a model diagram. Patent applicant: Asahi Kasei Industries, Ltd. Figure 1 M-A middle 1 ((%) Figure 2 Otsu 6

Claims (6)

[Claims] (1) It is a spun yarn in which multiple yarns with different strength properties are covered with staple fibers, and the inside of the yarn is made up of a low-strength yarn as a core yarn, a high-strength yarn forming a loop, and is essentially sagging. A characteristic composite yarn. (2) A spun yarn made by covering multiple yarns with different strength characteristics with staple fibers.The inside of the yarn is made of a low-strength yarn with shrinkage ability, and a high-strength yarn forms a loop around the core yarn, so there is virtually no slack. The composite yarn according to claim 1, characterized in that: (3) The composite yarn according to claim 1, wherein the shrinkage rate of the short fibers is higher than the shrinkage rate of the core yarn. (4) The composite yarn according to claim 1, characterized in that the low-strength yarn of the core yarn is intertwined with the high-strength yarn in a loop in an alternate S and Z twist. (5) The composite yarn according to claim 1, wherein the high strength yarn is a metal fiber. (6) The composite yarn according to claim 1, which has a sag ratio of 5 to 300%.