JPH0686714B2 - White woven and knitted fabric with excellent sheer prevention - Google Patents

Description

TECHNICAL FIELD The present invention relates to a woven or knitted fabric that is dyed white and is mainly used for clothing, and is worn in direct contact with the skin. The present invention relates to a woven / knitted fabric which is excellent in preventing sheer, such as a shirt, pants, blouse, and white coat.

(Prior art) Sheaths, pants, blouses, lab coats, etc. that are dyed in white and worn in direct contact with the skin have poor hiding power when the woven or knitted fabric is thin, and the skin is transparent. It may look like. For example, when a thin sheer white cloth is worn as a tennis jacket, inconveniences such as seeing through the skin and seeing through underwear often occur. In addition, underwear such as summer white golf pants is often seen through.

As a conventional technique for solving such a problem, 1. Increase the density of the woven or knitted fabric.

2. Use thick or fluffy yarn.

3. Apply white pigment.

Methods such as are known. But one or two of these
Regarding the method (1), as a result, the woven or knitted fabric becomes thicker, which causes a problem that the wearing functionality may be impaired. In the method of 3, the texture is apt to be hard and the washing durability is low.

(Problems to be Solved by the Invention) The present invention provides a method for preventing see-through of a white thin woven or knitted fabric without increasing the thickness of the woven or knitted fabric and having good washing durability. Is.

(Means for Solving the Problem) In the above-mentioned conventional technique, in order to prevent the see-through of the white cloth, the idea is to increase the light hiding property by increasing or adding the white fiber and the inorganic pigment. However, the present invention has arrived at focusing on the fact that the achromatic coloring on the back surface side has a greater light hiding property than the enhancement of white color.

That is, the present invention is composed of a white polyester yarn, a surface having a reflectance of 70% or more for light of any wavelength of 400 ~ 760 nm and a substantially achromatic gray colored cotton, A woven or knitted fabric having a back surface composed of at least one yarn selected from the group consisting of yarns of rayon, acrylic, hemp, wool, nylon and cationic dyeable polyester.

The present invention is premised on a woven or knitted fabric in which yarns can be selectively used on the front and back. Examples of such woven and knitted fabrics include double woven fabrics, circular knitted double nits, tricots and ratchets. By applying suitable threads to these,
We can manufacture shirts, blouses, thin lab coats and pants. For example, bright nylon 75 ^d for warp and weft
The double weave, which has a plain weave design with a density of 90 yarns / inch (both warp and weft) and the back is made of only 20 count cotton wefts, is suitable for summer sports pants, but it is simply white fluorescent color. It is inevitable that the dyed product is transparent, and the line of the brief is clearly visible when worn.

The present invention can be obtained by using a yarn having a dyeability different from that of the front yarn on a part or all of the back of such a woven or knitted fabric. The yarns having different dyeability means that only one yarn can be colored by using an appropriate dye. Further, it means a combination in which when the back yarn is colored, the front yarn is not colored by the dye used therein.
As such a combination, there is a combination as shown in Table 1.

Apart from this, it is also possible to dye the front yarn in white after forming the cloth by using the yarn dyed or colored in gray only for the back yarn. Further, a woven or knitted fabric of the present invention can be obtained by forming a cloth by using a yarn dyed or colored in gray as a back yarn and a yarn dyed or colored in white as a front yarn.

When coloring the back yarn in this way, it should be noted that the colored front yarn is white, so that the colored back yarn does not affect the whiteness of the front and reduce the whiteness. Therefore, in the present invention, it is important that the back yarn is colored substantially achromatic. Although it is an achromatic color, it ranges from white to black, but if it is too white, the effect of preventing see-through does not appear sufficiently. If it gets too close to black, the white color on the surface looks dirty. From these things, the preferable suitable range of blackness is JI.
The range is from the first grade to the fourth grade of S gray scale. The more preferable concentration of the back yarn varies depending on the thickness of the cloth and the fineness of the back yarn to be colored, but it is usually necessary to be in the above range.

In the present invention, it is preferable that the surface side of the woven or knitted material is sufficiently white, but specifically, the reflectance of the surface side is in the visible region (40
The white is preferably 70% or more for any wavelength of light (0 to 760 nm).

The white color and the substantially achromatic color referred to in the present invention include not only a completely white color or an achromatic color but also an extremely pale color. For example, cream color, light pink color, light blue color, etc. are included in the white or substantially achromatic color referred to in the present invention. However,
In the present invention, the case where the color is completely achromatic or white is more preferable. When coloring the back side with a light color, a color that does not greatly damage the front side color as the back side color,
For example, it is preferable to select a hue that is the same as or similar to the color of the surface side.

Now, the judgment of the effect of the sheer preventing white cloth thus obtained is carried out as follows.

That is, a white cloth is covered on the surface where the black standard color and the white standard color are in contact with each other, and the contrast between the black and white standard colors visually recognized through the white cloth is compared with the JIS contaminated gray scale to make a series judgment. That is, the contamination level 1 has the highest transparency and the contamination level 5 has the lowest transparency. The following method was used as a specific method.

(Evaluation method of anti-transparency) As standard black and white paper, Sun Peach (manufactured by Nisshinbo)
Prepare black and white of two and fix them side by side (first
Figure). Place the sample to be evaluated on top of the sample and see the contrast of the white and black shades
Judgment is made by comparing with JIS pollution gray scale. The higher the anti-see-through property, the higher the series (see FIG. 2).

The present invention will be described below with reference to examples.

Example 1 Two kinds of woven fabrics A and B were produced by using the yarns shown in Table 2 when weaving a double weave as shown in the organization chart of FIG. In FIG. 3, the portions marked with X indicate the warp thread floats, the blank portions indicate the warp thread floats, and the black circle points indicate the corresponding knot points on the front design of the back thread.

Then, A and B were subjected to fluorescent whitening dyeing on both polyester and cotton by a conventional method. This sample is A-1, B-1
And

Next, before applying fluorescent whitening dyeing to A and B according to the usual method, Kayacryl Black BS-ED of cationic dye (Basic Dyestuff)
(Nippon Kayaku) was used at 0.2% owf to dye the cationic dyeable polyester component of the back yarn, and after thoroughly soaping, both polyester and cotton were subjected to fluorescent whitening dyeing by a conventional method. The samples thus obtained are designated as A-2 and B-2. The degree of coloring on the back side of Sample A-2 was 2.5 on the contaminated gray scale, and the degree of coloring on the back side of B-2 was 2.5. Table 3 shows the results of evaluation of the see-through properties of these four samples A-1, B-1, A-2, B-2 by the above method. The visible light reflectance on the surface side of these samples was 70% or more. As is apparent from the above, it can be seen that the one with the back surface colored has good anti-transparency.

Next, all of the back yarns (E / C 24 / 1C-50) of these samples were pulled out, and the samples with only the front yarns were taken as A-1 ', A-
2 ', B-1', B-2 ', A-1', A-2 ', B-
Comparing 1'and B-2 ', there was no difference in whiteness between them, and all were 5 in the contamination gray scale judgment.
It was in class. From this, the effect of preventing see-through in Table 3 is completely brought about by the coloring of the back yarn, and since the front yarn is also contaminated at the same time when the back yarn is colored, the show-through preventing property is shown. It can be seen that is not an improvement.

Example 2 A tricot knitted fabric was prepared as follows using a 4-gauge 28 gauge tricot machine.

This knitted fabric is relaxed and pre-set by a conventional method, and then a cationic dyeable polyester is applied to Aizen Cathilon Black MH 0.
It was dyed gray with 3% owf and then the polyester was fluorescent whitened. The coloring degree on the back surface side was 1.5 on a gray scale stain, and the visible light reflectance on the front surface side was 70% or more for light of any wavelength. As a comparative control, a product not dyed with cationic dyeable polyester was also prepared. When the transparency of the two is compared, the one dyed with the cationic dyeable polyester is grade 4, and the undyed polyester is grade 2.
It can be seen that there is a significant difference in the see-through property, and that the method of the present invention can provide an excellent anti-see-through effect.

[Brief description of drawings]

FIG. 1 is a schematic diagram of standard paper used to measure the degree of see-through, FIG. 2 is a schematic diagram of measurement of the degree of see-through using the standard paper, and FIG. 3 can be used in the present invention. The organization chart of the woven fabric is shown.

Claims (1)

[Claims] 1. A surface which is composed of white polyester yarn and has a reflectance of 70% or more with respect to light having any wavelength of 400 to 760 nm and a cotton which is colored in a substantially achromatic gray color, A woven or knitted fabric having a back surface composed of at least one yarn selected from the group consisting of yarns of rayon, acrylic, hemp, wool, nylon and cationic dyeable polyester.