JP2002138336A - Two-layered structure twisted yarn which is partially dissolved off to form hollow and underwear using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lightweight spun yarn having an excellent heat-retaining property and excellent softness, and to provide an underwear using the spun yarns. SOLUTION: The two-layered structure spun yarn has a two-layered structure comprising a core layer and a sheath layer, wherein the core layer portion comprises a blend of soluble fibers with shrinkable fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-layer spun yarn capable of providing underwear which is lightweight, excellent in heat insulation and soft, and a spun yarn obtained from the core layer and having a hollow portion in a core layer, and its production. About the method.

[0002]

2. Description of the Related Art Conventionally, there has been a demand for a lightweight woven or knitted fabric having high heat retention, and it has been proposed to use a spun yarn using a hollow spun yarn (Japanese Patent Application Laid-Open No. 7-18535).
Further, a multi-layered twisted yarn using a melted fiber such as PVA for the core and a method for producing the same have been proposed (JP-A-9-317).
No. 81, JP-A-9-59839, JP-A-9-598
No. 302545).

However, if the hollow portion is formed in the processing stage, the hollow shape of the core portion is easily damaged in the processing stage such as dyeing and finishing after forming the hollow, and it is difficult to maintain the hollow portion to the product stage. There was a problem that the performance such as lightness, heat retention, and softness due to the formation was not sufficiently exhibited.

[0004]

DISCLOSURE OF THE INVENTION The present invention is directed to a spun yarn which is lightweight, has excellent heat retention and softness, and is suitable for coping with the collapse of the hollow shape at the processing stage, making the hollow shape less likely to be damaged. The aim is to provide worn underwear.

[0005]

SUMMARY OF THE INVENTION The present invention relates to the following hollow spun yarn having a two-layer structure, a method for producing the same, and underwear produced using the spun yarn. Item 1. It has a two-layer structure consisting of a core layer and a sheath layer.
A two-layer spun yarn obtained by randomly blending the above fibers. Item 2. Item 2. The two-layer spun yarn according to Item 1, wherein the shrinkable fiber is an acrylic fiber having a large shrinkage and a high bulkiness. Item 3. The ratio of the soluble fiber and the shrinkable fiber to be blended is (3:
Item 1. The two-layer spun yarn according to item 1 or 2, which is 1: 1: 1). Item 4. The core layer has a two-layer structure of a core layer and a sheath layer, and the core layer portion is subjected to a melting treatment of a two-layer structure spun yarn obtained by randomly blending a soluble fiber and a shrinkable fiber to remove the soluble fiber, and the core layer is hollow. A method for producing a two-layer hollow spun yarn having a random hollow portion in a core layer portion, comprising a step of forming a portion and a step of shrinking shrinkable fibers. Item 5. An undergarment manufactured using the two-layer spun yarn according to any one of Items 1 to 3.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The hollow spun yarn according to the present invention is a non-dissolvable shrinkable fiber and a hollow portion in a core layer portion.
Preferably a spun yarn that exists substantially randomly,
Specifically, there is one as shown in FIG. Hollow ratio is 2
It is preferably from 5 to 80%, particularly preferably from 30 to 70%. If the hollow ratio is too small, effects such as bulkiness and heat retention may be insufficient, and if too large, the morphological stability of the hollow portion may be insufficient. In addition, the hollow ratio of the twisted yarn referred to in the present invention means that the cross-sectional area of the fiber portion and the hollow portion of the cross-section of the twisted yarn is S1,
When the cross-sectional area of the hollow portion between the single fibers (excluding the hollow portion formed in the single fiber) is S2, the expression S2 / S1 × 100
Means the value (%) represented by Therefore, it is clearly distinguished from the hollow ratio of the hollow fiber (the area ratio of the hollow portion in the cross section of the single fiber).

[0007] The hollow spun yarn of the present invention can be produced by dissolving and removing a soluble fiber preferably present at random in the core component of a composite spun yarn / structured yarn having a core-sheath structure. Such a core-sheath type composite yarn can be produced by a usual method. For example, the core and sheath components are separately supplied and passed through a blending cotton step and a carding process, and the core component is arranged at the center and the sheath component on both sides so as to have a predetermined core and sheath ratio, and then supplied and drafted. The obtained sliver can be obtained by directly spinning and spinning the obtained sliver.
Also, the core and sheath components are separately supplied to form slivers, and the spinning amount is set in accordance with the desired core / sheath ratio. Then, the core component is supplied at the center and the sheath component is disposed around the periphery. It is also possible to produce by spinning (or supplying the roving of the core component and the roving of the sheath component one by one) and spinning the roving of the core component in advance, When spinning, the spun yarn of the core component may be supplied from a front roller. Examples of the soluble fiber used for the core portion that can be similarly spun even when the core component is a filament include, for example,
Water-soluble polyvinyl alcohol-based fibers and alkali-soluble polyester-based fibers can be used, and the soluble fibers can be dissolved and removed from the core layer with hot water, water, or an alkali. As the water-soluble fiber, a water-soluble polyvinyl alcohol fiber is particularly preferable. Of course, filamentary fibers may be used as the core component.

[0008] Examples of the shrinkable fiber (malle) include non-soluble fibers having a heat shrinkage of 10 to 40%, and specifically, acrylic fibers. The shrinkable fiber preferably has a high bulky property, and has a heat shrinkage of 10 to 10.
40%, preferably 15 to 30%.

In a preferred embodiment of the present invention, a blended sliver of a soluble fiber and an undissolved fiber having a heat shrinkage of 10 to 40% is used as the core layer.

The ratio of the soluble fiber to the shrinkable fiber used for the core may be any ratio as long as the above-mentioned hollow ratio is obtained.
Preferably, soluble fibers and shrinkable fibers are used in a ratio of (3: 1) to (1: 1). By mixing the dissolvable fibers and the shrinkable fibers preferably uniformly, the hollow portions are prevented from concentrating at one place after melting, the hollow portions are formed randomly, and the hollow portions are hardly crushed (see FIG. 2). Also,
In a preferred embodiment, the shrinkable fiber shrinks at the stage of dissolving or after dissolving, thereby supporting the formed hollow portion and preventing the hollow portion from being crushed even after being subjected to a post-processing press or the like. As described above, in order to prevent the hollow portion from being crushed, it is desirable to arrange the hollow portions randomly without being concentrated at one place.

The fibers used for the sheath are polyester fibers, polyacryl fibers, rayon fibers, cotton, wool, silk,
A synthetic fiber or a natural fiber such as hemp can be appropriately selected.

[0012] The cloth knitted and woven using such a raw yarn dissolves the melted fiber in the processing stage after the cloth is formed, so that a hollow portion is developed. In order to cause heat shrinkage, it is preferable to dissolve by applying heat. The applied heat differs depending on the melt fiber used and the bulky fiber having a high shrinkage.

[0013]

The present invention will be described below in more detail with reference to examples and comparative examples. Example 1 Water-soluble vinylon (PVA) and bulky ratio of 20 in the core layer
% Acrylic fiber was used at a ratio of (2: 1), and a double-layered yarn was produced using cotton for the sheath layer portion. The ratio of the core layer portion to the sheath layer portion was 3: 7, and 40/1 and 30/1 were spun.

Using this raw yarn, a milling dough was manufactured.

Processing is performed by scouring at 90 ° C. for 20 minutes.
A hollow portion was developed, and then exposed and pressed.

As a control group, a fabric obtained by knitting 40/1 and 30/1 cotton with the same design (one-turn course yarn length) under the same processing conditions and finishing is compared. 1. It can be seen that a hollow portion is developed before and after dissolution (FIGS. 1 and 2). 2. Each physical property value is as follows, and it can be seen that there is an effect.

[0017]

[Table 1]

Material thickness, compression rate, elastic modulus (compression modulus): JIS-L-1018 CLO value (flat plate method): dough is placed between two copper plates kept at a constant temperature difference (12 ° C.) How to calculate the CLO value from the amount of heat flowing through the scissors and the dough Bendability JIS-L-1096E

[0019]

According to the present invention, it is possible to provide a spun yarn which is lightweight, excellent in heat retention and softness, and underwear using the same.

[Brief description of the drawings]

FIG. 1 is a schematic view of a cross section of a spun yarn before dissolving and removing soluble fibers.

FIG. 2 is a schematic view of a cross section of a hollow spun yarn after dissolving and removing soluble fibers.

FIG. 3 is a schematic view of a cross-sectional structure of a hollow spun yarn of the present invention.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // A41B 17/00 D06M 7/02 B (72) Inventor Takahiro Yamazaki 262 Sozu, Miyazu-shi, Kyoto Gunze Stock Company Apparel Division (72) Inventor Yoshiro Inaba 262, So, Miyazu, Kyoto Prefecture Gunze Co., Ltd.Apparel Division (72) Inventor Takashi Maruoka 262, So, Miyazu, Kyoto, Japan Gunze Corporation Apparel Division (72 ) Inventor Naofumi Mukai 262 Sou, Miyazu-shi, Kyoto Gunze Co., Ltd. 1-2-1, Ichikaigan-dori, Kuraray Co., Ltd. (72) Inventor Hiromi Mitsuoka 1 Shioyacho, Marugame City, Kagawa Prefecture No. 8-1, Kurashiki Spinning Co., Ltd. Marugame Factory (72) Inventor Megumi Uenishi 2558 Kannonji-cho, Kanonji, Kagawa Prefecture Kurashiki Spinning Co., Ltd., Kannonji Factory (72) Inventor Yasunori Sato 2 -4-31 Kurashiki Spinning Co., Ltd. F-term (reference) 3B029 HB01 4L002 AA04 AA08 AB01 AB02 AB05 AC00 DA01 EA00 EA01 FA03 4L031 AA17 AB01 AB03 AB23 BA11 BA33 CA01 CA06 DA00 DA05 4L036 MA04 MA09 MA35 MA39 PA20 PA31 PA46 RA03

Claims (5)

[Claims] 1. A two-layer spun yarn having a two-layer structure of a core layer and a sheath layer, wherein a core layer portion is formed by randomly blending soluble fibers and shrinkable fibers having a heat shrinkage of 10 to 40%. 2. The two-layer spun yarn according to claim 1, wherein the shrinkable fiber is an acrylic fiber having a large shrinkage and a high bulkiness. 3. The method according to claim 1, wherein the ratio of the soluble fiber and the shrinkable fiber to be blended is (3: 1 to 1: 1).
Layered spun yarn. 4. A two-layer spun yarn having a two-layer structure of a core layer and a sheath layer, wherein a core layer portion is formed by randomly blending a soluble fiber and a shrinkable fiber, is subjected to a dissolution treatment to remove the soluble fiber. A method for producing a two-layer hollow spun yarn having a random hollow portion in a core layer portion, the method including a step of forming a hollow portion in a core layer and a step of shrinking shrinkable fibers. 5. An undergarment produced using the two-layer spun yarn according to any one of claims 1 to 3.