JPS6359435A - Coated yarn - Google Patents

Abstract

(57) [Abstract] 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 a covered yarn made of a composite of materials with different properties, and more specifically, the present invention relates to a covered yarn made of a composite of materials with different properties. The present invention relates to a covered yarn having a core-sheath structure that is coated twice.

(Prior art) Conventionally, covered yarns with a core-sheath structure have been used in the clothing field, but when used in the clothing field, the characteristics of the core yarn can be utilized to impart functions such as strength, tension, and stiffness, and the sheath yarn can also be used to impart texture. , hygroscopic,
Functions such as color tint can be added. In addition, in the field of industrial materials, core threads and sheath threads are preferably used to take advantage of their respective strengths and compensate for their shortcomings.

However, in order to improve the abrasion resistance of coated yarn, it is necessary to cross the wound yarns of the sheath with each other, which results in poor yarn surface quality and yarn properties, and also poor process passability in the subsequent process. There was a problem with that. In other words,
At the intersections of the wound yarns, the yarn becomes locally thick and the yarn surface lacks smoothness, and the winding pitch of the wound yarns is also not the same, resulting in poor surface quality and stiffness.

In addition, the tensile strength of the covered yarn mostly depends on the tensile strength of the core yarn, and the strength is low even though the yarn is thick, and when tension is applied to the yarn, the core yarn stretches and becomes thinner, so the sheath yarn There were many problems such as the threads becoming loose and the sheath threads becoming easily wrinkled.

(Objective of the Invention) The object of the present invention is to solve the previously unresolved problems mentioned above, and to provide a coated yarn with a smooth yarn surface, strong resistance to external forces such as ironing and tensile strength, and excellent surface quality. We are committed to providing this.

(Structure of the Invention) In order to achieve the above object, the present invention consists of the following structure. In other words, in a core-sheath-covered yarn consisting of a core yarn constituting the core and a sheath yarn that winds and covers the same, the sheath portion is constituted by a plurality of sheath yarns, and each layer of the sheath portion is made up of a plurality of sheath yarns. The winding pitch is the same and the core yarn is covered without crossing each other, and the tensile strength of the single fibers that make up the core yarn is 129/
The coated yarn is characterized by having an elongation of d or more and an elongation of 10% or less.

In the present invention, the single fiber core yarn of the core yarn must have a tensile strength of 12 y/d or more and an elongation of 10% or less, and the higher the strength, the better, and the elongation is preferably 2 to 6%.

If the tensile strength is too low or the elongation is out of this range, the strength as a covering yarn will be significantly reduced, it will be weak for its thickness, and the core yarn will stretch and become thinner under high tension, and the sheath yarn will be easily squeezed. Become.

Examples of the core yarn used include polyacrylonitrile fibers, polyvinyl alcohol fibers, polyethylene fibers, and para-aromatic polyamide fibers.

Among these, for example, polyacrylonitrile fibers are preferably dry-wet-spun in a dimethyl sulfoxide solvent, and then subjected to first stretching (liquid bath stretching) and second stretching (dry heat stretching) to 1q. In this case, the total stretching ratio is about 15 to 20 times. The molecular weight is 150,000 to 300,000, the tensile strength of the fiber is 129/d or more, and the elongation is 10% or less.

In addition, polyvinyl alcohol-based fibers are produced by spinning using a dry-wet method (spinning solvent is dimethyl sulfoxide or glycerin) or gel method (spinning solvent is glycerin), and using methanol as a coagulating liquid. Stretching is primary and secondary co-dry heat stretching, with a total stretching ratio of 20 to 30 times.The molecular weight is 130,000 to 660,000, the tensile strength is 22 y/d or more, and the elongation is 4 to 5%. be.

Furthermore, in the case of polyethylene fibers, it is preferable that the fibers be spun using a dry-wet method or a gel method, and then subjected to multi-stage high-magnification stretching.
The total stretching ratio is 30 to 60 times. Molecular weight is 30
It has an ultra-high molecular weight of about 0,000,000 and high crystallinity, and the strength of the fiber is 50 g/d or more and the elongation is 3 to 4%.

In the case of para-aromatic polyamide fibers, they are generally called aramid fibers and have a stable molecular structure, so the strength of the fibers is 22 g/d and the elongation is 3 to 4%. be.

The core yarn does not necessarily have to be a single yarn, but when it is composed of a plurality of single yarns, it is desirable that the core yarn be bundled to the extent that it can behave as a single yarn.

On the other hand, the sheath threads constituting the sheath portion are made of thread-like material and need to be made up of a plurality of threads. Each sheath thread must have the same winding pitch and cover the core thread without intersecting each other, and it is preferable that the core thread is densely covered.

The individual threads used as sheath threads may be synthetic fibers, natural fibers,
Spun yarns, monofilaments, multifilaments, etc. made of metal or unfiltered fibers can be used, but functional fibers are preferred. That is, in the present invention, since the sheath yarns do not cross each other in the same layer, if the sheath yarn itself in the outermost layer has functions such as easy dyeability, color development, hygroscopicity, bulkiness, and layering properties, the coating Even when it is made into yarn, its properties can be fully exhibited. For example, easily dyeable fibers include vegetable fibers, animal fibers, and synthetic fibers, but among synthetic fibers, aliphatic polyamide fibers are
It is preferred because of its excellent color development and abrasion resistance. For example,
When using natural fibers such as cotton or wool, the properties such as cotton's hygroscopicity, wool's layering properties, bulkiness, and feel can be fully utilized when used as a coated yarn. Research and development has also been conducted on methods of surface-modifying synthetic fibers to give them functions similar to those of natural fibers, and it is also possible to use these fibers in sheath yarns.

Moreover, the effect of the present invention becomes even more remarkable when the sheath yarn is twisted at about 20 to 300 T/m.

The sheath portion may be one in which a plurality of sheath threads are wound around the core thread in only one layer, or a plurality of sheath threads may be further arranged on top of the already formed sheath layer so that the relative arrangement relationship with each other is disturbed. It may also have a two-layer structure wound at the same winding pitch. In the case of this two-layer structure, it is preferable that the winding directions of the sheath yarns in each layer are different from each other. The number of filaments, material, winding pitch, etc. between the two layers can be changed as appropriate.

Examples of the covered yarn of the present invention will be explained below based on the drawings.

FIG. 1 is a side view showing an example of a covered yarn in the present invention, and FIG. 2 is a cross section of the covered yarn shown in FIG. 1. FIG. 3 shows another example of a side view of the covered yarn of the present invention, and FIG. 4 is a cross-sectional view of the covered yarn of FIG. 3.

In the example shown in FIGS. 1 and 2, the sheath portion is constructed by wrapping the sheath yarn 2 around the core yarn 1 with five thread-like materials 2a, 2b, 2c, 2d, and 2e in the S direction. In the covered yarn, the individual filaments of the sheath yarn 2 are in contact with each other but do not intersect, and completely cover the core yarn 1. Figures 3 and 4
The figure shows that the sheath part has two layers, one made of sheath yarn 2 and the other layer made of sheath yarn 3.
This is an example of a covered yarn in which each layer has a different winding direction.

In this example, the sheath threads 2 in the lower layer of the sheath part have four thread-like materials 2a,
2b, 2c, and 2d are wound and coated at the same pitch in the S direction, and the sheath thread 3 in the upper layer is covered with six thread-like materials 3a, 3b, and 3.
c, 3d, 3e, and 3f are covered yarns that are wound and covered at the same pitch in the Z direction.

FIG. 5 shows an example of an apparatus for manufacturing the covered yarn of the present invention, and in FIG. 6, 51 is a hollow spindle that is rotationally driven, and a plurality of filamentous materials 2a, 2b, 2c, 2d.

A bobbin 52 on which the sheath thread 2 made of 2e is wound at the same time is provided. Further, at the upper end of the hollow spindle 51, a sixth
A rotation guide 53 as shown in the figure is provided, and is attached to the hollow spindle 51 so as to freely rotate. The rotation guide 53 has a plurality of rods extending radially at equal intervals from a central fixed portion to the upper end of the hollow spindle 51, each having a guide hole 53a at the tip thereof.

In such a device, the thread-like material 2a is drawn from the bobbin 52 while the core thread 1 is run from below to above with the center of the hollow spindle 51 being rotationally driven.

2b, 2c, 2d, and 2e, this bobbin 52
A plurality of filamentous materials 2a, 2b unraveled from.

2C, 2d, and 2e are ballooned while being separated from each other via a rotating guide 53, and wound around the core yarn 1 at the same time and at the same intervals in a converging guide 54 to form a covered yarn having the structure of the present invention. Form. The core thread does not necessarily need to be run from the bottom to the top, and may be run from the top to the bottom. In this case, the focusing guide 54 becomes unnecessary.

The coated yarn according to the present invention can be manufactured by using intertwisting, a hollow spindle, etc., and adjusting the supply yarn speed, take-up yarn speed, tension, etc. as appropriate while taking into consideration the fineness and elongation of each yarn.

The covered yarn described above is only an example of the present invention, and it goes without saying that the number of sheath yarns, number of windings, winding direction, thickness, etc. can be arbitrarily selected.

(Example) Example 1 As a core yarn! $1 Spun yarn (30' SZ twist) made of Egyptian cotton filament yarn made of 300 denier polyvinyl alcohol-based I fiber with tensile strength of 16 y/d and elongation of 4.5% as sheath yarn. A coated yarn having a core-sheath structure was produced using five pieces of the yarn and wound in the S direction as shown in FIGS. 1 and 2 at a winding pitch of 352 T/m using an apparatus as shown in FIG. The core yarn of the coated yarn was not visible, and the sheath yarns did not overlap, making it look like a twisted yarn made of a single component yarn, and it looked like a handicraft yarn with a good quality appearance.

The tensile strength of the covered yarn is 4.66q, and the elongation is 4.3%.
It had high strength and low elongation.

Further, using the covered yarn, a basket weave fabric having a warp thread density of 48 threads/inch and a weft thread density of 42 threads/inch was woven. The weavability was good, and the sheath yarn of the covering yarn was not wrinkled despite being a high-density woven fabric, resulting in a high-quality woven fabric.

Comparative Example 1 Tensile strength of single fiber as core yarn is 6.4 y/d, elongation is 3
Five spun yarns similar to those used in Example 1 were used as sheath yarns, including filament yarns made of 0% 300 denier aliphatic polyamide fibers, to produce conventional covered yarns that crossed each other. The coated yarn was locally thick at the intersections of the wound yarns, and not only did the yarn surface lack smoothness, but also the core yarn was exposed in some areas, resulting in a poor quality coated yarn.

The tensile strength of the covered yarn was 1.91 K () and the elongation was 27%, but the core yarn had been stretched considerably and became thin before it was cut.

Also, an attempt was made to weave using the covered yarn, but the sheath yarn of the yarn was wrinkled during the preparation process, and the quality of the covered yarn was extremely poor, so weaving was discontinued.

(Effects of the Invention) The covered yarn of the present invention completely covers the core yarn with a minimum number of sheath yarns, has the same surface quality as ordinary single-component yarn, has extremely high tensile strength, and has a high tensile strength. The sheath fibers are resistant to wrinkles even under tension, resulting in high quality and high functionality.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a covered yarn according to the present invention, and FIG. 2 is a cross-sectional view of the covered yarn shown in FIG. FIG. 3 is a further example of a side view of the covered yarn of the present invention, and FIG. 4 is a cross-sectional view of the covered yarn of FIG. 3. FIG. 5 is a schematic diagram showing an example of the apparatus for manufacturing the covered yarn of the present invention, and FIG.
The figure is a plan view of a rotation guide used in the device.

Claims (1)

[Claims] In a covered yarn with a core-sheath structure consisting of a core yarn constituting the core and a sheath yarn that winds and covers it, the sheath part is composed of a plurality of sheath yarns, and the winding pitch of each sheath yarn in each layer of the sheath part is are identical and cover the core thread without intersecting each other,
The tensile strength of the single fibers constituting the core yarn is 12 g/d or more,
A covered yarn characterized by having an elongation of 10% or less.