JPH04241168A - Processing of cellulosic fiber cloth to impart particular feeling - Google Patents

Abstract

PURPOSE:To impart a cellulosic fiber cloth with particular feeling, i.e., soft touch with durable squeaking nature and transparent feeling. CONSTITUTION:A cellulosic fiber cloth is treated with sulfuric acid and subjected to a low-temperature gas plasma treatment. A particular feeling unattainable by separate treatment can be attained by the combination of the sulfuric acid treatment and the low-temperature gas plasma treatment. The cloth treated by this process is useful for shirts and casual wears.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing method capable of imparting a special texture to a cellulose fiber fabric, that is, a durable squeaky texture and a transparent soft texture.

0002

BACKGROUND OF THE INVENTION Conventionally, organdy processing using sulfuric acid or heparin processing has been known as a method for imparting a special texture to cellulose fibers, especially cotton. In other words, organdy processing and heparine processing are performed by immersing fine count high-quality fabrics such as lawn and voile made of cellulose fibers in a concentrated aqueous solution of sulfuric acid at 5 to 20°C for a short period of time to create a squeaky and transparent feel. However, products obtained by conventional organdy finishing and heparin finishing have a too stiff feel, making them unsuitable for clothing and limiting their use.

[0003] In order to solve the problem of the texture being too hard, Japanese Patent Publication No. 2846/1984 also describes a method of adding an organic acid having 6 or more carbon atoms (for example, heptyl acid) to the sulfuric acid bath. JP-A-59-76967 discloses that a water-soluble organic solution (e.g., ethyl alcohol) of a monocyclic aromatic hydrocarbon (e.g., O-xylene) is applied to a cellulosic fiber fabric, and then this solution is applied to a undried state. A method of impregnating it with concentrated sulfuric acid has been proposed.

In addition, when the texture becomes too stiff, there are known chemical methods in which a surfactant such as a softener is applied to the fabric, and physical methods in which the fabric is rubbed with a calendar, spiral brake, etc.

[0005]

[Problems to be Solved by the Invention] However, a method of adding an organic acid having 6 or more carbon atoms to a sulfuric acid bath (Japanese Patent Publication No. 28-2
846) and a method of pretreatment with a water-soluble organic solution of a monocyclic aromatic hydrocarbon (Japanese Patent Application Laid-open No. 76967/1983).
is not yet a perfected technology, and there is a problem that uniform quality cannot be obtained.

[0006] Furthermore, the method of applying a softener or the method of mechanically kneading has the problem that the squeaky texture obtained by the sulfuric acid treatment is lost.

[0007] The present inventors conducted an experiment in which sulfated cellulose fibers were treated with low-temperature gas plasma, and surprisingly found that they retained their squeaky feel and transparency, and their texture became softer. I got it.

The present invention has been made based on this knowledge, and its purpose is to provide an industrially advantageous and low cost method for obtaining a cellulose fiber fabric having a unique texture that has never been seen before. is to provide.

[0009]

[Means for Solving the Problems] The above object is achieved by a special texture processing method for cellulose fiber fabric, which is characterized by subjecting the cellulose fiber fabric to sulfuric acid treatment and then subjecting it to low-temperature gas plasma treatment. Ru.

The present invention will be explained in detail below.

[0011] The cellulosic fiber fabric referred to in the present invention is a fabric containing cellulose fibers, such as cotton, linen, rayon alone, or blends and interwoven fabrics of these cellulose fibers with other fibers such as polyester, polyamide, and acrylic. It will be done.

[0012] The sulfuric acid concentration in the sulfuric acid treatment is 100 to 15
0°TW is preferred, more preferably 110-130°
TW, the temperature condition is preferably in the range of 5 to 20°C,
Preferably, the treatment time is approximately 1 to 10 seconds. When the sulfuric acid concentration is high, the temperature is high, and the time is long, the cellulose fibers deteriorate and the physical properties deteriorate significantly. On the other hand, the sulfuric acid concentration is low;
When the temperature is low and the treatment time is short, the sulfuric acid treatment has no effect, and the desired squeaky, taut, stiff feeling does not occur, and the organdy feeling does not develop at all.

After the sulfuric acid treatment, a neutralization step and a soaping step are performed, followed by drying, and then a low temperature gas plasma treatment is performed.

[0014] In the present invention, low-temperature gas plasma refers to non-equilibrium plasma in which the electron temperature in the plasma is sufficiently higher than the ambient temperature of the plasma gas, and any known method may be employed to generate the plasma. I can do it. For example, J. R. Hollahan and A
．． T. Bell, ed. "Applied Techniques of Plasma Chemistry", Wiley New York 1974 and M. Shen, ed. Polymer Plasma Chemistry, Dekker, New York, 1976.

That is, gas can be placed under vacuum between parallel plate electrodes connected to a high frequency generator, and plasma can be generated using the parallel plates either outside or inside the vacuum chamber. Alternatively, an electric field may be created by an external induction coil to generate a plasma of ionized gas, or a plasma may be generated by placing oppositely charged electrodes spaced apart directly into a vacuum chamber.

The gas used for plasma processing is oxygen, nitrogen, helium, argon alone or a mixture of two or more thereof. Carbon monoxide air can also be used. However, the higher the mixing ratio of oxygen, the higher the reforming effect and the faster the processing speed, and in normal industrial production, the oxygen content is preferably 5% or more.

The degree of vacuum in the processing machine during plasma processing is preferably 0.05 to 10 Torr as long as low-temperature plasma is generated by high-frequency irradiation and the temperature of the processing atmosphere is such that it does not damage the fabric to be processed. is 0.3T
It is appropriate that it is in the range of orr to 2 Torr.

[0018] The reduced pressure condition is 0.05 Torr to 10 Torr.
The reason for this limitation is that if the degree of vacuum is 10 Torr or more, the generation of low-temperature plasma will become unstable, and the temperature of the processing atmosphere will rise, which may damage the fabric to be processed. This is because maintaining the pressure at a high degree of vacuum not only increases costs but also reduces the gas concentration, which may reduce the plasma processing effect.

The frequency of the radio frequency irradiated to generate low-temperature plasma can be used in a fairly wide range from long wavelength to short wavelength, but is preferably 1 MHz to 3000 MHz.
Those in the z range are easy to use. In practice, due to regulations such as the Radio Law, 13.56MHz, 27.12MHz, 40MHz
．． It is preferable to use one of 68 MHz, 915 MHz, and 2450 MHz.

[0020] When high frequency energy is applied to gas molecules at a reduced pressure of 0.1 to 10 Torr, the gas molecules are excited, generate low-temperature plasma, and become highly reactive. The cellulose fiber fabric is treated in this plasma atmosphere.

[0021] The treatment time varies slightly depending on the weight of the fabric, density, content of volatile components such as moisture, high frequency irradiation conditions, gas concentration, pressure, or the required modification effect, but generally it is 1 to 30 minutes.
It should be done for about 600 seconds, more preferably 5 to 45 seconds.
It is best to process within a range of 0 seconds.

[0022] The weight loss rate of the cellulose fiber fabric by low-temperature plasma treatment is preferably adjusted to 1 to 10%. If the weight loss rate is less than 1%, the texture will not be soft,
In addition, if the weight loss rate is 10% or more, the strength may be lowered.

[0023] The cellulose fiber fabric treated as described above has a soft texture with little loss of strength and a durable squeaky feel and transparency.

[0024]

[Example] This will be explained below using an example.

[0025] The test method on which the numerical values in the examples are based is as follows.

(1) Tear strength JIS L-109
6 D method (2) Bending hardness Measured using a KES texture testing machine manufactured by Kato Iron Works Co., Ltd. (3) Texture test Measured using a KES texture testing machine manufactured by Kato Iron Works Co., Ltd. Hand value is displayed based on standards for thin fabrics for women's outerwear. (4) Washing test JIS L-0217 103
law

Example 1 A high-quality cotton thin plain fabric with a warp and weft count of 100 twin yarns, a density of 67 yarns/inch in the warp, 64 yarns/inch in the weft, and a basis weight of 87 g/m2 was fired by a conventional method. Desizing, scouring, and bleaching were performed.

[0028] The plain woven fabric was placed in a 120°TW sulfuric acid solution at a temperature of 1
After being immersed for 3 seconds at 2°C, it was immediately squeezed using a mangle, washed with water, further neutralized in a saturated aqueous sodium sulfur solution, thoroughly washed with water, and then squeezed using a mangle and thoroughly dried.

Next, mercerization (NaO
The product of Example 1 was obtained by performing a low-temperature plasma treatment under the following conditions. Gas used: Oxygen Decompression degree: 0.5 Torr High frequency frequency: 13.56 MHz High frequency output
2.5KW processing time 1
20 seconds

Comparative Example 1 The same fabric as in Example 1 was used and the same treatment as in Example 1 was carried out except that the plasma treatment was not performed.
A product of Comparative Example 1 was obtained by performing the same processing as described above.

The physical properties of the product of Example 1 and Comparative Example 1 are shown in Tables 1 and 2.

[0032]

[Table 1]

[0033]

[Table 2]

[0034] As is clear from Tables 1 and 2, the products obtained according to the present invention have a soft texture without any influence on tear strength, and have excellent washing durability.

Example 2 A broad cotton single yarn with a warp and weft count of 50, a density of 144 yarns/inch in warp, 80 yarn/inch in weft, and a basis weight of 120 g/m2 was burnt, desizing, scouring, and I exposed myself.

[0036] The plain woven fabric was placed in a 122°TW sulfuric acid solution at a temperature of 1
After immersing for 3 seconds at 0.5°C, immediately squeeze with a mangle, wash with water, neutralize in a saturated aqueous sodium chloride solution, rinse thoroughly with water, squeeze with a mangle, and dry thoroughly. I did it.

Next, mercerization (NaO
The product of Example 2 was obtained by performing a low-temperature plasma treatment under the following conditions. Gas used: Oxygen Decompression degree: 0.5 Torr High frequency frequency: 13.56 MHz High frequency output
2.5KW processing time 1
80 seconds

Table 3 shows the physical properties of the product of Example 2 obtained.

[0039]

[Table 3]

As is clear from Table 3, the product obtained according to the present invention has a soft texture without any effect on tear strength, and has excellent washing durability.

[0041]

Effects of the Invention As detailed above, the present invention combines sulfuric acid treatment and low-temperature gas plasma treatment to provide a special texture that could not be obtained by each alone, that is, a durable squeaky feeling and a transparent feel. It imparts a soft texture and is extremely useful for shirts, casual uses, etc.

Claims (1)

[Claims] 1. A special texture processing method for a cellulose-based fiber fabric, which comprises subjecting the cellulose-based fiber fabric to a sulfuric acid treatment and then subjecting it to a low-temperature gas plasma treatment.