JPS58104224A - Production of spun yarn with double-layered structure - Google Patents

Abstract

PURPOSE:Fleeces for the sheath part, which are thicker than the fleece for the core part, are set on both sides of the core fleece, then they are collected to form a double-layered structure, then drafted to effect the stabilized production of spun yarns with a double-layered structure ensured. CONSTITUTION:In the drawing process, slivers for component B are arranged on both sides of the sliver for component A so that the thickness lB of the fleece for component B is made to more than 1.5 times the one lA of component A. Then, they are collected by use of the collecting means to push the fleece A into the fleeces B to form a double-layered sliver, then drafted to effect fine spinning. Thus, a spun yarn with double-layered structure is obtained with good coverage by the sheath yarns.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a double-structured spun yarn with excellent coverage of sheath fibers.

Conventional 1 Synthetic fibers have the functionality of strength, rigidity, wrinkle resistance, shape stability, heat setting properties, and quick drying properties after washing (washable properties), and the excellent feel of natural fibers. Blends of these two materials are widely used in order to provide sweat absorbency and feel to the skin.

However, except for the 9-way mixed covering yarn, uniform blending of single-component fibers is common.

Recently, due to the energy saving trend and the spread of home laundry, sheets and duvet covers made mainly of natural fibers,
Quick-drying properties and dimensional stability during drying are now required in the bedding field such as pillowcases, as well as in the outer layer field such as underwear and jeans. In these fields, the use of conventional homogeneous blended yarns provides the functionality of synthetic fibers, but there is a problem in that the excellent hand properties of natural fibers are diluted. There has been an increasing demand for a composite of synthetic fibers and natural fibers that eliminates this drawback and has the functionality of natural fibers, and research on composite technology has been actively conducted. One of them is.

For example, it is a composite yarn of filaments and natural fibers as seen in Japanese Patent Publication No. 56-9565, or.

JP-A-49-101639, JP-A-49-47633
This is a double-structured spun yarn as seen in Japanese Patent Application Publication No. 52-74040.

Double-layer spun yarn is an ideal composite yarn that combines the functionality of synthetic fibers with the feel and feel of natural fibers, but it is difficult to completely cover the core with the natural fibers that make up the sheath. It is very difficult to do this, and because the core is exposed in places, problems such as uneven dyeing, changes in texture, and changes in appearance are likely to occur.

Even in the above-mentioned known examples, this problem is not satisfied.

The present invention provides a double-structured spun yarn with excellent coverage of sheath fibers.

The basis of the present invention is to utilize the focusing force in the right angle direction of the fleece that occurs when 7 wreaths drafted in a filament machine are focused using a trumpet, and the fleece to be the core part is supplied thinner than the fleece to be the sheath part. is forcibly pushed into the core of the sliver, and is an epoch-making method for producing double-structure yarn that can stably produce reliable double-structure yarn.

That is, in the present invention, when blending two or more types of fibers, B component fiber slivers are arranged on both sides of the A component fiber sliver in the filament process, and the thickness of the B component fleece is equal to the thickness of the A component 7 leases. 1.5 times or more, and then focused using a focusing means to form a two-layered sliver,
This is a method for producing a two-layer spun yarn, which is characterized in that the yarn is then drafted and spun.

In the present invention, the two or more types of fibers may be any combination of fibers, but preferably natural fibers and synthetic fibers, and particularly preferably a combination of polyester fibers and cotton. Preferably, the inner layer of the spun yarn is polyester, and the outer layer is cotton.

In the present invention, two or more types of slivers may be combined and then drafted while maintaining the thickness unevenness. Any means for focusing the combined sliver may be used, but a trumpet guide is preferred. Further, it is preferable to perform the focusing rapidly. Using the focusing force at this time, the thin A-component fiber fleece is raised from the main body part and wrapped with the B-component fibers at both ends, so that the A-component fibers are in the core part and the B-component fibers are in the sheath part. . Such a two-layered sliver may be roved and then spun, or it may be directly spun into a spun yarn. Such spinning is most preferably ring spinning, but also includes known spinning such as false twist spinning and bundle spinning.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In the filament machine, two types of A fibers (slivers) and 5 fibers (slivers) drawn from a can (not shown) are transferred to a back roller 2.
The 7 wreaths after the draft are collected into a sliver by a trumpet 4, and when taken into a can by a coiler (not shown), B is added on both sides of the A fiber that is to be the core. In addition to arranging the fibers, the thickness I of the B fibers is determined as shown in FIG. 1 (2). It is generated at the trumpet part by setting n to 1.5 times or more of the thickness of A fiber/A, and rapidly converging the 7 leases with the difference in thickness after drafting with the trumpet of the coiler. Due to the binding force of the fleece, the thin A component fibers are raised from the main body and wrapped around the fleece on both sides to forcibly form a core.

FIG. 2 shows the above-mentioned focusing→wrapping action in the present invention. The cross sections of the trumpet entrance part P, intermediate point Q, and minimum diameter part R in FIG. 2 (1) are respectively zl-2,
', z2-22', 23-23'.

The condition of the fleece at each cross section is shown in Figure 2 (2).
It is indicated by. Since the entire fleece is focused by the trumpet, a perpendicular force or focusing force acts on the fleece. At this time, since the thickness of the center portion, which is the core portion, is thinner than that of both side portions, it cannot withstand the focusing force and rises to the top (P). moreover.

When reaching the middle part Q of the trumpet, the fleece converges and the fleece on both sides begins to wrap around the raised part along the periphery of the trumpet. Further, at the smallest part, the B-component fibers wrap around the A-component fibers, and the A-component fibers come to the core and become a sliver with an almost perfect double structure. in this case.

In order to effectively utilize the focusing force, it is important that the trumpet guide 5 restricts the fleece as little as possible.

Further, by setting the ratio of the thicknesses of the seven wreaths B and A to 1.5 to 2 times or more, preferably 3 times or more, the core portion can be formed reliably.

The third principle of forced core formation in the present invention is as follows.
This will be explained in an easy-to-understand manner using the model diagram shown in the figure. In FIG. 5, 7.7' is a semicircular moving guide that can slide on the base A. First, as shown in FIG. 6(1), B fibers whose thickness is 1.5 to 2 times or more than the thickness of the A fibers are arranged on both sides of the A fibers. The slide guide 7 is set to have the same width as the fleece width. Next, slide guide 7.7' is moved inward. In this case, the B fibers ride on the arc of the guide and are in the state (2).

Here, when the B fiber receives a force W from the circular arc portion of the guide, a horizontal component force W2 is generated. This W2 is the focusing force of the fleece and functions to tighten the fleece from both sides. At this time, part A, which is thin, cannot withstand this force and bulges in the shape of a lobe at the top of the part.Furthermore, the slide guide moves, and when the two sides come together to form a circular guide, it moves along a nine-circular arc. Both ends of the moved B fibers are combined to form a complete sheath as shown in 3), and the A part forms the core.

Figure 3 (1) is similar to (P) in Figure 2 (2) and Figure 6 (2).
).

It goes without saying that (3) corresponds to (Q) and (R) in FIG. 2 (2).

As described above, since the A fibers forming the core are forced into the center by the focusing force, the A fibers constantly form the core.

The method of making a thin 7 wreath to bring to the core in this way is shown in Figure 4. In Figure 4, +11 (
2+ refers to the case where slivers with different thicknesses are used, and the double structure sliver of the present invention can be obtained by making the thickness of the B component sliver 15 to 2 times or more that of the A component. +
31. (No. 41 is a guide method when using slivers of approximately the same thickness, and the thickness of the sliver is such that the thickness of the B component sliver is 1.5 to 2 times or more than the thickness of the A component. The height of the guide of B in the cross section is 1 of the height of A,
．． A guide with a diameter of 5 to 2 times or more is installed as close as possible to the nip point on the back roller population side.

FIG. 5 shows the formation of the core part even more completely,
As shown in (1), at the boundary between A component and B component, B
By making the component close to the thickness of the A component, when focused by a trumpet, a part of the B component will also bulge together with the A component at the AB boundary part, as shown in (2).
This means that the A component no longer appears near the surface at the boundary. In order to form a thin layer at the boundary, as shown in Figure 5 (3), the thickness of the B component slivers on both sides of the A component is between the thickness of the A and B component slivers, or , as shown in (4), B at the boundary
This can be achieved by installing a guide close to the nip point of the back roller so that the height and thickness of A are close to or the same height as A.

Note that the present invention is not limited to the type of wire forming machine at all.

Next, an explanation will be given using an example.

Example 1 Polyester staple 1.5 denier x as component A
2 slivers of 38 mm, thickness 2.95 g/rn (250 gel/6 yd) and 8 pieces of rice cotton combed rhino (-4,4367 m (575 gel/6 yd))
The book was supplied to a four-line draft liner by the method shown in FIG. 4(1) of the present invention. The cotton sliver thickness/polyester sliver thickness ratio was 2.0. Next, at a draft magnification of 7.86 times and a spinning speed of 100 m/9, a two-layer structure sliver with a ratio of cotton and polyester of 4.5:1 was obtained (final filament), and using this sliver, 2O8- cotton/
Ring spun yarn of polyester blend was spun (twist coefficient =
6.5). The yarn was knitted into a jersey with a basis weight of 120 g/m2 using a 20G single knitting machine, and the cotton jersey was dyed with indigo dye (indigo '5g/sample 1oo).
g). The dyed cloth had a single color of deep indigo despite its relatively thin count, and there was almost no undyed white polyester, confirming that it was a good two-layer yarn.

Example 2 Polyester staple 1.5 denier x as component A
The method shown in Figure 5 (4) of the present invention uses two slivers of 38 mm and a thickness of 2.95 g/m (250 gel/6 yd) and six combed rice cotton slivers of the same thickness as the polyester as component B. I combined it with Yoshi.

The thickness ratio of the B component/A component was 1.6. A sliver with an almost perfect two-layer structure with a cotton/polyester ratio of 6:1 was produced, and a 45S ring-spun yarn was spun from the sliver (twist coefficient k = 3.6).

Using this yarn, the fabric weight was 150g/28G single circular knitting machine.
I knitted an m2 jersey. The cotton side of the jersey was dyed deep blue using indigo dye (3 g of indigo/100 g of sample). The dyed knitted fabric obtained had almost no undyed (white) polyester on the surface, had a deep blue-colored touch, and had good firmness and firmness.

Comparative Example 1 A spun yarn was obtained under the same conditions as in Example 1 except that the thickness ratio of the sliver of component B (cotton)/polyester A acid component was changed to 1.4. Next, when dyeing was carried out in the same manner as in Example 2, the dyed knitted fabric was found to have shading and a mixture of cotton and polyester on one surface.

[Brief explanation of the drawing]

FIGS. 1, 4, and 5 are explanatory diagrams of the method for manufacturing a two-layer yarn according to the present invention, and FIGS. 2 and 3 are illustrations of the principle of operation of the present invention. 2: Back roller 3 - Front roller 4 Nidrampets 5 Nidrampets guide A: Core component fiber (sliver) B: Sheath component fiber (sliver) Patent applicant Azuma Shi Co., Ltd. 3r + Sono (+) (2) '2) W Figure 2 (2) A Fang 3 figure Fang deception (2) (3) (thousand) 145

Claims (1)

[Claims] (1) When blending two or more types of fibers, the B component fiber slivers are arranged on both sides of the A component fiber sliver in the filament process, and the thickness of the B component fleece is 1.5 times the thickness of the A component fleece. 1. A method for producing a two-layered spun yarn, which comprises firstly converging the yarn so that the yarn is doubled in size or more, then converging it using a converging means to form a two-layered sliver, and then drafting and spinning. [2] Claim (1) characterized in that the two or more types of fibers are made of at least polyester and cotton.
A method for producing a two-layered spun yarn as described in Section 1.