JPS63256744A - Double-layered cotton 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 a two-layered cotton yarn that is less sticky and has excellent heat retention properties.

There are various characteristics required for shirting materials, and among these, characteristics such as wash resistance, abrasion strength, heat retention, and elasticity differ depending on the use. Comfort with respect to insensible sweating and sweating during exercise and in hot environments (hereinafter collectively referred to as "sweat") is determined by the stuffiness and stickiness of clothing, and is an important factor in clothing design. .

This comfort is also greatly influenced by the properties of the shirting material that makes up the garment.

10 cotton fibers currently used in such shirting materials
The 0% spun yarn is a random blend of multiple raw cottons with different properties.

In addition, we have two-layered cotton yarn with a so-called core-sheath (Jitsukai Sho 6l-59678), which has a thick cotton fiber as the core and is surrounded by fine-grained cotton fibers, and a polyester staple in the core and a polyester staple around it. A double-layered yarn made of cotton fiber (Special Publication No. 8l-52248) has also been introduced as such a shirting material.

(Problems to be solved by the invention) By the way, cotton fibers used as shirt material1
Since the 00% spun yarn had cotton fibers of different finenesses arranged randomly, it was not possible to significantly exhibit capillary action between the fibers. Therefore, shirts made of this material have poor sweat-absorbing properties and are uncomfortable to wear.

In addition, a double-layered cotton yarn in which a core of thick cotton fibers is surrounded by fine-grained cotton fibers has a stiff and good texture, but has a sticky feel and lacks comfort.

Furthermore, although a two-layer yarn using a polyester staple in the core has the characteristics of both the core and sheath, it lacks heat retention.

The present invention aims to eliminate these drawbacks of conventional spun yarns and provide a two-layered cotton yarn that is less sticky, has excellent heat retention, and is highly comfortable.

(Means for solving the problems) The present invention takes the following means to solve the problems. That is, the present invention provides a two-layered cotton yarn consisting of a core and a sheath, the core having a thickness of 1.5 mm.
d undropped cotton fibers are mainly arranged, cotton fibers with a thickness of 1.5 d or more are mainly arranged in the sheath part, and the above 1.5
It is characterized in that the cotton fibers having a diameter of less than d account for 10 to 40% by weight in the double-layered cotton yarn. The present invention will be explained in detail below.

The two-layered cotton yarn of the present invention consists of a core part and a sheath part, and the cotton fibers present in these parts have different thicknesses, with the cotton fibers in the core part having a thinner thickness. This is to allow sweat to transfer smoothly. In addition, cotton fiber was chosen because it increases heat retention and comfort as a shirting material.

First, the thickness of the cotton fibers arranged in the core is less than 1.5 d, preferably less than 1.2 d, and more preferably 0.8 to 1.5 d.
It is Od. This is because the capillary action of the fine denier cotton fibers in the core is used to transfer liquid phase sweat from the skin side sheath to the core, absorbing heat from the liquid phase sweat itself and vaporizing it. In order to efficiently generate capillary action, the thickness should be 1.5 d.
Must be less than When it is 1.5d or more, sweat migration becomes difficult to occur. The weight percent of cotton fibers less than 1.5 d is preferably 10 to 40 weight percent with respect to the two-layer cotton yarn, preferably 3
It is 0 to 40% by weight. If it is less than 10% by weight, capillary action will be difficult to occur, and if it exceeds 40% by weight, it will be difficult to absorb sweat.

Next, the thickness of the cotton fiber in the sheath portion is 1.5 d or more, preferably 1.5 to 4 d. If it is not Od, it must be 1゛. This is because it makes it easier to absorb sweat from the sheath on the skin side.In order to efficiently absorb sweat, it is preferable to use mercerized cotton as the cotton fiber in the sheath.This is made from hydrated cellulose. This is because the degree of molecular alignment of the liquid decreases, making it easier for liquid to penetrate.

Furthermore, the number of twists applied to the two-layer cotton yarn is preferably 2.8 to 4.0, more preferably 3.0 to 3.0, in terms of twist coefficient.
It is 8. If the English cotton count of the two-layer cotton yarn is N e s, the number of twists per inch (T/inch) is T1, and the twist coefficient is K, there is a relationship between the champions as T=K J'Fre. The thickness of the two-layer cotton yarn is 20'S/1 to 200 in English cotton count.
'S/1 is preferred, more preferably 30'S/1~
It is 100'S/1.

Here, the method for producing the double-layered cotton yarn of the present invention will be explained.

First, a sliver made of raw cotton fibers with a diameter of less than 1.5 d is produced in a mixed batting process, and a sliver made of raw cotton fibers with a diameter of 1.5 d or more is similarly produced in a mixed batting process, and then the latter The raw cotton is loaded onto the roving machine.

Next, the former sliver is fed from the rear of the back roller to the central part of the 1.5 d or more cotton fiber sliver and drafted together to produce a two-layer roving.

At this time, the weight percent of the 1.5 d unfinished cotton fiber in the core portion is appropriately determined in consideration of the draft magnification so that it occupies 10 to 40 weight percent in the two-layered cotton yarn.

Furthermore, the obtained two-layer structure roving is drafted and heated using a spinning machine to obtain a two-layer structure cotton yarn. At this time, it is preferable to set the draft magnification to 20 to 50 times in order to improve the degree of coverage.

(Function) The mechanism of sweat absorption and release in the two-layer cotton yarn of the present invention will be described. The thick raw cotton in the sheath on the skin side quickly absorbs sweat from the human body (both gas and liquid phases), and the fine raw cotton in the core absorbs liquid phase sweat into the core due to capillary action. What is vaporized and becomes a gas phase is sequentially absorbed by the thick raw cotton in the sheath on the outside air side due to the water vapor pressure difference between the skin side and the outside air side. Originally, sweat in the gas phase passes through the large-fine raw cotton in the sheath and transfers to the thick-fine raw cotton in the sheath on the outside air side due to the water vapor pressure difference between the skin side and the outside air side. Sweat in the vapor phase quickly evaporates from the thick raw cotton in the sheath on the outside air side.

(Example) Example 1゜ Indian cotton with a fineness of 1.1 d was used as the raw cotton for the core, Peruvian cotton with a fineness of 1.9 d was used for the raw cotton in the sheath, and the proportion of the Indian cotton was 25% by weight based on the total amount. The proportion of the Peruvian cotton is 75% by weight based on the total amount, and a two-layer structure yarn (
110/15yds) was produced.

For comparison, these raw cottons were uniformly mixed at a ratio of 50:50 to produce roving (Comparative Example 1), with thick raw cotton (1.9 d Peruvian cotton) in the core and fine raw cotton in the sheath. (1,
(Comparative Example 2) using 1 d Indian cotton) with a 25 wt % core (comparative example 2), 25 wt % 0.7 d polyester staple fiber in the core, and 75 wt % cotton fiber ( A roving (comparative example 3) using a roving yarn (thickness: 1.2 d) was also produced. Note that the same roving bag was used in all cases. Then, a predetermined draft was applied using a spinning machine to produce a spun yarn of 40'S/1 (the twist coefficient was 3.6 in the inch system). Next, these threads are used to weave textiles,
The material was sewn into a shirt and the maximum internal humidity, equilibrium internal humidity, and heat retention were measured. The measurement results are shown in Table 1. Measurements were made using a clothing climate simulation device (Japanese Patent Application Laid-open No. 58-21184, Japanese Patent Application Laid-open No. 58-88859).

The environmental conditions of the clothing climate simulation device were set to 20℃,
65% R111 Simulated skin temperature set at 35℃, shirt 1
It was assumed that the wearer was wearing one.

In addition, the heat retention is 21°C, 50% R11. Airflow 100m
It is defined by the heat retention ability of clothing when a person sitting at rest in room B feels comfortable. The heat retention property is measured by measuring the power consumption required to maintain the heat source plate at a constant temperature using a constant temperature heat retention tester (manufactured by Daiei Seiki Co., Ltd., type ASTM), and calculating the claw value. The higher the claw value, the higher the heat retention.

However, T1 nibrate temperature ("C), To: outside temperature ("C) W near 1X force (W), t nibrate off time (sec) S: surface area of sample (1), Q: input heat amount (K
cal//-hr) No. 1 Clothes feel comfortable when the humidity inside the clothes is 50±
It is said to be in the range of 10%R11l.

In the case of Example 1, both the maximum humidity inside the garment and the equilibrium humidity inside the garment were within a comfortable range, and the heat retention property was also good, making it suitable as a material for autumn and winter clothing. Comparative Example 1 had a stuffy and sticky feel, and its heat retention was poor. In Comparative Example 2, since the core part was made of thick raw cotton and the sheath part was made of fine fine raw cotton, the capillary phenomenon did not work well, and the feeling of stuffiness and stickiness was noticeable. Comparative Example 3 has excellent internal climate, but has low heat retention due to the influence of the core.
In this respect, it was inferior to that of Example 1 of the present invention.

(Effects of the Invention) The two-layered cotton yarn of the present invention exhibits the effect that it does not feel stuffy or sticky, has excellent heat retention properties, and is particularly suitable as a material for shirting in autumn and winter.

Claims (1)

[Scope of Claims] 1. A double-layered cotton yarn consisting of a core and a sheath, in which cotton fibers with a thickness of less than 1.5 d are mainly arranged in the core and with a thickness of less than 1.5 d in the sheath. A two-layered cotton yarn characterized in that cotton fibers of 1.5 d or more are mainly arranged, and the cotton fibers of less than 1.5 d account for 10 to 40% by weight of the two-layered cotton yarn. 2. The two-layered cotton yarn according to claim 1, wherein the cotton fiber of the sheath portion is mercerized cotton.