JP5440928B2 - Knitted fabric excellent in heat retention and underwear using the knitted fabric - Google Patents

Description

The present invention, there is provided a knitted fabric of thin cloth of 100% cotton, on the underwear that heat retention is using 25 percent or more of the skin wear knitted fabric and the knitted fabric.

Knitted fabric of the present invention, clothing, especially for use, such as in underwear, that is, woven or knitted fabric knitted fabric is preferably easy flexible high insulation fabric Soi to the human body shape when worn. To increase the heat retention of woven and knitted fabrics, increase the thickness of woven and knitted fabrics made of natural and synthetic fibers, double thin and triple layers, and raise the air layer by raising the fabric surface. There are many techniques to improve heat insulation. However, due to the diversification of fashion in recent years, there is a demand for underwear that is thin, light and comfortable to wear, and does not resonate with outerwear. For this reason, methods such as fixing a functional agent having a heat retaining effect of a woven or knitted fabric made of natural fibers or synthetic fibers, or performing knitting and weaving using a yarn composed of fibers having a high heat retaining effect have been adopted. .

  For example, if a large amount of air is held in the fiber gaps in the fabric structure to improve heat retention, the thickness of the fabric itself must be increased in order to create an air holding space. For this purpose, the surface of the synthetic fibers such as polyester and polyamide that make up the fabric is aluminum that has the effect of reflecting the infrared rays emitted from the human body, and the metal that is coated with a metal such as silver on the surface of the fiber by plating or vacuum deposition. An undergarment using a knitted fabric made of clothing synthetic fibers is disclosed (Patent Document 1).

  Further, in a garment composed of materials knitted from natural fibers or synthetic fibers, a mixture of alumina and silica having an average particle size of 0.02 μm and a high emissivity in the far-infrared wavelength region of 5 to 20 μm. There is also disclosed a warming garment in which ceramic particles as a main component are adhered by a binder (Patent Document 2).

As an example of a multilayer knitted fabric, it is a knitted fabric composed of two or more layers, and at least the outer layer is composed of false twisted crimped yarns having a single yarn fineness of 0.2 to 3.0 dtex, and the knitted fabric At least one layer of the ground has a stitch density of 50 to 125 courses / 2.54 cm and 50 to 80 wales / 2.54 cm, and the air permeability of the knitted fabric is 5 to 50 cc / cm ² sec. And a heat-insulating knitted fabric characterized by having a water absorption of 2 sec or less (Patent Document 3).

  Furthermore, as a characteristic of the fabric material, it is a hygroscopic exothermic cellulosic fiber product that contains 10% by weight or more of a hygroscopic exothermic cellulose fiber and has excellent heat retention with a fiber density difference in the thickness direction of the fabric, A hygroscopic exothermic cellulosic fiber product excellent in heat retention in which a difference in fiber density in the thickness direction of the fabric is achieved by a fabric structure, a two-layer structured yarn or a raised fabric of the fabric is disclosed (Patent Document 4).

  As another example characterized by the fabric material, a spun knitted fabric including a polyester short fiber having a single fiber fineness of 0.01 to 10 denier and a single fiber strength of 2.5 g / denier or more is processed by raising a needle cloth, and thereafter The surface of the woven or knitted fabric is made of a flexible rough surface material having a polishing film surface, and is struck and abraded on the surface of the support roller. The surface fluff has an average fluff length of at least 1.1 mm and not more than 50 mm, and an average A method for producing a polyester spun knitted fabric that is finished so that the fluff density is 200 yarns / cm or more is disclosed (Patent Document 5).

JP 2001-20103 A Japanese Patent No. 3264366 Japanese Patent No. 3853175 JP 2001-172866 A Japanese Patent No. 3536540

  However, if a thick undergarment is used to maintain heat retention, it will be uncomfortable to wear and will also resonate with the outer, reducing fashionability. In order to cope with this, in order to increase the heat retention with a thin fabric, if a functional agent is fixed to the fiber surface to obtain sufficient heat retention, it is necessary to contain a large amount of chemicals, and the texture and texture are The disadvantage of getting worse. In addition, in the case where functional fibers are used, there are problems such as texture, and the present invention has been made in view of the point that the texture of natural fibers is required.

The invention according to claim 1 is a raised knitted fabric formed by knitting 100% cotton yarn having a yarn count of 60/1 or more, and a heat retention rate of 25% by adjusting the fluff rate to 24% or more and 40% or less. A knitted fabric excellent in heat retention, characterized by being a thin knitted fabric as described above, and an undergarment made using the knitted fabric.
In the invention according to claim 2, the twist coefficient of the cotton yarn used for the knitted fabric excellent in heat retention according to claim 1 is set to 2.5 to 3.0.
According to a third aspect of the invention, Oite to claim 1 excellent knitted warmth description, knitted tissue and smooth knitted, the thickness of the knitted fabric 0.40mm or less and a basis weight of 150 g / m ² or less It was.

In the present invention, the knitted fabric formed by brushed knitted 100% yarn cotton yarn count 60/1 or more fine count, the fluff rate by 40% or less than 24% suppressed excessive brushed, thin cloth It has a strong force that for practical use yet in, and, it was possible to obtain 100% of the knitted fabric cotton with excellent thermal insulation.

An image of fluff is shown. A is an image of a fluff of a knitted fabric having a fluff rate of 11.6% and B is a fluff rate of 22.1%. It is a graph which shows the relationship between the heat retention rate and the fluff rate which the various knitted fabrics which are 100% cotton of this invention have.

Next, an embodiment of the knitted fabric of the present invention will be described.
The knitted fabric of the present invention enables the fabric strength to be maintained even when raised in order to increase the heat retention rate while being a thin fabric. The thin fabric referred to here has a thickness of 0.40 mm or less and a basis weight of 150 g / It is a knitted fabric of m ² or less, and a 100% cotton smooth knitted fabric is preferable. In order to increase the heat retention rate in a thin knitted fabric, it is an effective means to increase the surface fluff by performing brushing, and the heat retention rate increases as the fluff rate increases. By increasing the air layer of the knitted fabric due to the fluff, a heat insulating layer can be formed, and heat retention can be enhanced even with a thin fabric. In the knitted fabric of the present invention, as apparent from the description of the graph shown in Table 1 and FIG. 2 below, when the fluff rate exceeds 24%, the heat retention rate is 25% or more, and below that, the heat retention rate is 25% or more. It cannot be secured. However, the rise in the heat retention rate has reached its peak when the fluff rate exceeds 35%. Further, as shown in Table 1, the heat retention rate increases by increasing the fluff rate, but the strength of the knitted fabric decreases as the fluff rate increases. The strength of the knitted fabric can be measured by the burst strength, but the practical strength cannot be maintained at a burst strength of 300 kPa or less. If the fluff rate exceeds 40%, the burst strength may be less than 300 kPa, so the fluff rate needs to be suppressed to 40% or less.
In addition, when the twist coefficient of the yarn increases, the knitted fabric strength increases, but the fluffing at the time of raising is reduced, and in order to obtain the desired fluff rate, the raising conditions must be strengthened and the knitted fabric is damaged . The quality is lowered. Further, when the twisting coefficient is reduced, the fluffing at the time of raising is good, but the strength is reduced. If the twisting factor is reduced by 30% or more from the twisting factor 3.4-3.7 of the regular product, hole defects (decrease in strength) in knitting increase and become a practical problem. For this reason, it is necessary to set a twist coefficient to 2.5-3.0.

Hereinafter, the reason why each requirement of the present invention described above is selected by the present invention and comparative examples will be described in detail. Table 1 shows the measurement results for a knitted fabric in which 100% cotton fiber is a smooth knitted fabric.
In Sample 1 to Sample 7 of Table 1, desirable results were not obtained in the fluff rate and the heat retention rate. Samples 8 and 9 have significant effects on the fluff rate and the heat retention rate.
About this invention, the sample shown in the sample 10-the sample 12 shown in the measured value of the knitted fabric raw material described in Table 1 is employ | adopted as Example 1, 2, 3, About the heat retention rate, intensity | strength, and a fluff rate Various tests were further performed and are shown in Table 2.
The measurement results shown in Table 1 show that samples 10, 11, and 12, which are a fine yarn having a yarn count of 60/1 or higher and a twist coefficient of 2.5 to 3.0, have excellent heat retention, It shows that there is. The reason for the sweet twist is that the fluffing is good when raising after knitting, and the desired fluff rate can be easily achieved.

A knitted fabric is knitted with a smooth knitting structure with the yarns of the samples 10, 11 and 12 having the above-mentioned yarn count and the above twist coefficient. The thickness of the knitted fabric is 0.40 mm or less and the basis weight is a thin knitted fabric of 150 g / m ² or less. The thickness of the knitted fabric was calculated by measuring five locations of the entire width of the knitted fabric using a thickness gauge (Quick Mini PK-1012CPX) manufactured by Mitutoyo Corporation and rounding the average value to two digits after the decimal point. . This knitted fabric was found to be able to maintain a practical strength by raising at a fluff rate of 24% or more and 40% or less, and to obtain a performance with a heat retention rate of 25% or more. Knitted fabric strength is measured by burst strength. If the bursting strength is 300 kPa or more, a strength with no practical problem can be obtained. An example of the manufacturing process is scouring, bleaching, line drying, opening, finishing set, inspection, binding, raising, shearing, soaping, tumble drying, finishing, finishing, etc. .
The raising can be done by a known means such as sandpaper, raising with a cloth, or tumble drying. Brushing may be performed on one side or both sides of the knitted fabric, but is preferably performed on one side in order to maintain the strength. Furthermore, the warmth can be increased more preferably by performing the treatment on the surface that contacts the skin side.

In the present invention, the fluff rate is measured as follows.
1. A 5 cm square test piece is taken from the sample. The test piece is taken at three random locations from the part (JIS L 0105 5.3 (2)) that is 50 cm or more away from the end of the cloth and 10 cm or more away from the edge of the ear.
2. The specimen is folded at right angles to the wale direction, and the fluff is photographed with a microscope set to 50x.
3. Print on a large postcard and load it onto a computer with a scanner.
4). Open the imported image file, and trim the fluff side at 850 x 120 pixels along the edge of the knitted fabric with a free software image cutter.
5. Save the image and open it with Picture Publisher.
6). Mask the fluff using the chroma mask function. At this time, increase the percentage of the range and set it so that the fluff is masked.
7). Use the fill function to fill the masked fluff with white.
8). A value obtained by subtracting the percentage of the shaded portion calculated by the histogram function from 100 is defined as the fluff rate, and an average value of n = 3 is obtained.
FIG. 1 shows an image of fluff. A has a fluff rate of 11.6%, and B has a fluff rate of 22.1%.

The heat retention rate was measured by the Boken dry contact method. The dry contact method is a general heat retention test method, and assumes that the skin and clothes are in direct contact. The procedure is as follows.
1. A test piece of 20 cm × 20 cm is collected (n = 2).
2. 2. The measuring device uses a precise rapid thermophysical property measuring device (THERMO LABO II). The temperature of the constant temperature heating element of the apparatus is set to 30 ° C., the environmental temperature is set to 20 ° C. (temperature difference of 10 ° C. from the heating element), and the air flow on the knitted fabric surface is set to 30 cm / s.
4). The test piece is attached to a constant temperature heating element, and the amount of heat consumed to radiate heat is measured every 5 minutes for 30 minutes, and an average value is obtained (b).
5. The same amount of heat consumption is obtained with this and the bare specimen without the test piece (a)
6). The heat retention rate is obtained from the following formula.
Thermal insulation rate (%) = (1−b / a) × 100
a: Amount of heat consumed when the heating element is bare (W / cm ² )
b: Amount of heat consumed when the sample is attached to the heating element (W / cm ² )

Next, Examples 1 to 3 (Sample 1, Sample 2, and Sample 3) and Comparative Examples 1 to 4 (Sample 4, Sample 5, Sample 6, and Sample 7) of the heat retaining material are shown in Table 2, and the sensory test results are shown in Table 2. 3 shows.

From these results, it is clear that the knitted fabric of the present invention has a large heat retention rate despite its light weight and small thickness, and even in the sensory test results, ◎ felt warmth strongly, ○ felt warmth Many of them are out. Accordingly, a raised knitted fabric obtained by knitting a 100% cotton yarn having a yarn count of 60/1 or more according to the present invention described in Examples 1 to 3, and having a fluff rate of 24% to 40%. It was confirmed that the knitted fabric is excellent in heat retention and preferable as an underwear.

  The heat-retaining underwear made using the knitted fabric of the present invention is generally used for underwear used as an underwear, and is not particularly restricted in use.

  1 Fluff

Claims (3)

A raised knitted fabric formed by knitting 100% cotton with a fine yarn count of 60/1 or more, and a thin knitted fabric with a heat retention rate of 25% or more by adjusting the fluff rate to 24% or more and 40% or less. A knitted fabric with excellent heat retention . Excellent knitted thermal insulation according to claim 1, characterized in that a the twist coefficient of the cotton used twisted sweetness of 2.5 to 3.0. The knitted fabric excellent in heat retention according to claim 1, wherein the knitted fabric structure is a smooth knitted fabric, the knitted fabric has a thickness of 0.40 mm or less and a basis weight of 150 g / m ² or less .