JPH04136234A - Woven fabric for dustproof clothes - Google Patents

Abstract

PURPOSE:To obtain the subject woven fabric, having dustproof characteristics under prescribed conditions and suitable for operation in clean rooms by covering elastic yarn with specific polyester crimped yarn, using the resultant covered yarn in (either of)warp and weft directions and providing the woven fabric of twill weave. CONSTITUTION:The objective woven fabric for dustproof clothes is obtained by covering elastic yarn with polyester crimped yarn having 0.5-3.0de single fiber denier, using the resultant covered yarn in at least one direction of warp and weft directions, providing a woven fabric of twill weave having the surface thereof composed of the aforementioned polyester crimped yarn. The above- mentioned woven fabric satisfies conditions of (A) 3-30ml/cm<2>/sec air diffusibility, (B) 30-200% elongation is applying 1.5kg/5cm load in the direction of the aforementioned covered yarn used and (C) <=30% permeability of dust having >=0.3mu size in a state of the stretched fabric at 30%.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fabric for dustproof clothing, and particularly to a fabric for dustproof clothing suitable for work in a clean room.

[Prior Art] In recent years, the degree of integration of semiconductor devices has been increasing in the field of electronics, particularly semiconductors. Such highly integrated semiconductor devices are manufactured in a clean room or the like, and the cleanliness of the clean room is required to be high in proportion to the high degree of integration of the semiconductor devices. In order to maintain a clean room at a high level of cleanliness, an important issue is to prevent dust generation from workers inside the clean room. One type of dust generated by workers is dust generated from the dust-proof clothing worn by workers, and the second type is dust generated from the workers themselves and the underwear they wear. The third type is dust that is transmitted through dust-proof clothing, and the third type is dust that is generated from the worker's body and the underwear, etc. that the worker wears, and which is generated from the openings of clothing (cuffs, N01 neck area). It is known that there are three types of leaked dust that leaks from the surrounding area (e.g., around the face, etc.).

Conventionally, fabrics made of synthetic fiber filaments without free ends of fibers have often been used for such dustproof clothing, and the rotting of the dustproof clothing has been reduced to a low level.

Furthermore, fabrics used for dust-proof clothing have fewer problems with permeable dust due to higher density or coating treatment.

However, fabrics that have been densified or coated as described above have the disadvantage of reduced air permeability.

Furthermore, when a worker wears dustproof clothing made of such a low-breathability fabric, when the worker exercises, air leaks from the openings of the clothing due to fluctuations in air pressure within the clothing (this phenomenon is referred to as the "bumping effect"). On the contrary, there is a problem in that leaked dust increases.Furthermore, due to the low air permeability, the moisture inside the clothes cannot be discharged to the outside of the clothes, resulting in a strong uncomfortable feeling of stuffiness when worn.

Additionally, in order to reduce the number of openings in the clothing and prevent dust from leaking out, overall type dustproof clothing, in which the upper and lower clothing parts are integrated, is often used, which is effective in terms of dustproofing. ing. However, when exercising (particularly forward bending exercises) while wearing these overall-type dust-proof clothes, the upper and lower garments are one piece, so they cannot shift, and strong tension is applied to the fabric, especially on the buttocks and back, which can impair the exercise. It's unpleasant.

In order to improve this movement, stretchable fabrics are often used in general clothing. For example, there are examples using knitted fabrics or fabrics woven with elastic threads. However, conventional stretch fabrics have large inter-yarn gaps (open eyes) when the fabric is stretched, allowing a large amount of dust to pass through, making them unsuitable for use in dust-proof clothing, and therefore are not used.

In this way, conventional dust-proof clothing focuses only on dust-proofing properties, which sacrifices wearing comfort (stuffiness, mobility, etc.), which poses problems in terms of work efficiency and emphasis on humanity.

[Object of the Invention] An object of the present invention is to propose a fabric for dust-proof clothing that solves the conventional problems and enables a dust-proof clothing that is both dust-proof and comfortable to wear.

[Structure of the Invention] The present invention has a single fiber denier of 0.5 to 3. A covering yarn in which an elastic yarn is covered with a polyester crimped yarn in the range of 0 de is used in at least one direction of the warp direction and the weft direction, so that the fabric surface is made of the polyester crimped yarn.
A Mi-woven fabric is used, and the fabric meets the following conditions: a) Air permeability is in the range of 3 to 30 cc/ty&,/see.

1.5 kf in the direction using the covering yarn, /
5. The elongation of all when a load is applied is in the range of 30 to 100%.

(2) The transmittance of dust of 0.3 μm or more when stretched by 30% is 30% or less.

This is a fabric for dustproof clothing that satisfies the following.

Preferred examples of the elastic threads used in the fabric for dustproof clothing of the present invention include those made of polyurethane-based and polyether-polyester block copolymer-based compounds. Particularly in the case of dust-proof clothing used in the semiconductor field where various chemicals are used, it is desirable to use polyether polyester block copolymer elastic threads with excellent chemical resistance. A preferred example of the denier of the elastic yarn is 30 to 100 de.

Since the elastic yarn has inferior durability (chemical resistance, abrasion resistance, light resistance, etc.) compared to polyester fiber, in the present invention, the elastic yarn is used as a covering yarn covered with polyester fiber and is not exposed on the surface of the fabric.

The polyester crimped yarn covering the elastic yarn must have a single fiber denier in the range of 0.5 to 3.0 de. 3. If it is 0 de or more, the number of single fibers constituting the yarn is small, and the inter-fiber voids are large, making it difficult to prevent dust from permeating, making it impossible to achieve the object of the present invention. On the other hand, if the fiber denier is less than 5 de, the strength of the single fiber is weak and it is easy to break due to external force such as friction, and fuzz is generated and becomes dust. The purpose cannot be achieved.

The polyester fibers used in the fabric for dustproof clothing of the present invention need to have crimps to prevent dust from passing through. The term crimped in the present invention refers to a thread-like fiber having loops, looseness, slack, or tangles. The polyester crimped yarn can be obtained by a known method, and preferred examples include a false twist crimping method, a method using air jet flow, and a method using differential shrinkage of fibers.

In the fabric for dustproof clothing of the present invention, the covering thread is arranged in the warp direction,
Polyester crimped yarn is used in at least one direction in the weft direction, but in the weft direction when the covering yarn is used only in the warp direction, and in the warp direction when the covering yarn is used only in the weft direction. Use. The polyester crimped yarn may be a crimped yarn different in type from the polyester crimped yarn used to cover the elastic yarn.

As a result, the fabric surface of the fabric for dust-proof clothing of the present invention is composed of crimped polyester yarn, resulting in a structure with little dust penetration and excellent durability.

The weave structure of the fabric for dustproof clothing of the present invention must be a twill structure. In the case of a flat tissue, there are many tissue points that tend to form inter-tissue voids, and it is difficult to prevent the penetration of dust, so that the object of the present invention cannot be achieved. Conversely, in the case of a satin texture, there are too few texture points, and it is weak against external forces such as abrasion, tends to generate fluff, and generates a lot of dust, making it impossible to achieve the object of the present invention. A preferred example of the twill structure is the twill structure, which has moderate tissue points, few inter-tissue spaces, and is resistant to external forces.

The cover factor of the fabric <J dexJl density (book,
/cal) should be within an appropriate range to satisfy the requirements described below, but the cover factor in the direction perpendicular to the elastic yarn should be set to keep the inter-yarn voids (opening) small when the fabric is stretched. It is desirable that the elastic yarn is larger in the direction of use, 350 to 650, and 400 to 7 in the direction perpendicular to the elastic yarn.
00 can be suitably exemplified.

The air permeability of the dust-proof garment of the present invention is 3 to 30 cc.
It must be within the range of , ``d, / S e C. If the dustproof clothing is made of a fabric with breathability of less than 3cc, /'cyiK / g eC, the moisture inside the clothes cannot be discharged to the outside of the clothes, resulting in a feeling of stuffiness. Not only is the wearer's comfort inferior due to the strong air permeability, but also the leakage of dust due to the bombing effect is poor, resulting in poor dustproof properties, making it impossible to achieve the purpose of the present invention.On the contrary, the breathability is 30cc.
, /cnY, zsec or more, the purpose of the present invention cannot be achieved because the transmission of dust cannot be prevented.

The breathability referred to in the present invention is defined by JIS L 1096-6.2.
Measured by 7A method (Fragile type).

The fabric for dustproof clothing of the present invention must have an elongation (hereinafter referred to as elongation ratio) in the range of 30 to 10095 when a load of 1.5 kg, 5 cs is applied in the direction using the covering yarn. The dust-proof clothing made of the dust-proof clothing fabric according to the present invention utilizes its stretchability to reduce the bombing effect and reduce leakage of dust, and further improves its mobility, with an elongation rate of 30%. In this case, these effects are small and the object of the present invention cannot be achieved. Conversely, if the elongation rate is 1
If it is more than 00%, the elongation rate in this invention is JIS.
L1096-614. Hl) This is a value measured by method A (low-speed elongation method).

The present inventors conducted various studies on the elongation of the fabric when exercising while wearing dustproof clothing made of stretchable fabric, and found that the maximum elongation was approximately 30%. That is, for a fabric for dustproof clothing that has extensibility, the dust permeability when the fabric is stretched by 30% is important. Furthermore, the degree of integration of semiconductors in recent years has been high and the interval between integrated circuits has been extremely small, and therefore the size of dust to be controlled is also required to be small. That is, in order to achieve the object of the present invention, it is necessary that the article for dustproof clothing of the present invention has a transmittance of 30% or less for dust of 01 μm or more when stretched by 30%. In the present invention, the 30% stretched state refers to a state in which the fabric is stretched 30% only in the warp and weft directions where the stretch rate is high, and the other directions are free. The dust transmittance in the present invention is 18 cm in diameter.
A sample stretched by 30% as described above was fixed on the bottom circular surface (WI port) of a metal funnel-shaped cone with a height of 20 CI+, and the sample was heated at 500 cc/min from the top of the cone.
The air (A) that has passed through the measurement sample and the air (A) that has passed through the measurement sample and the air (A) near the bottom circular surface of the cone that does not pass through the measurement sample,
000 particles/ρ (dust of 0.3 μm or more) in air (B> dust concentration of 0.3 μm or more)
Measurements of μm or more are carried out using a light scattering particle counter (particle counter), and using the respective measurement values A and B,
The value calculated using the following formula.

C = A / B It makes clothing possible.

That is, in the fabric for dust-proof clothing of the present invention, crimped yarn with a small denier is used except for the elastic yarn, and the woven structure is a twill structure, so there are few inter-yarn voids, and even the slightest inter-yarn voids can be rolled. It is covered with shrunken fibers, and has a structure with many narrow and curved voids between the fibers. The fabric with such a structure allows air to pass through it relatively easily, but dust in the air is likely to adhere to and be collected by the fibers due to Brownian motion, etc., and the dust permeability can be reduced even when the fabric is stretched. To enable a protector with excellent dust resistance, less stuffiness, and excellent wearing comfort.

Furthermore, since the fabric for dustproof clothing of the present invention uses elastic yarn, it has high extensibility, and the dustproof clothing made of the fabric has little pumping effect and is excellent in dustproof properties, and furthermore, has excellent mobility. Furthermore, the elastic yarn is coated with highly durable polyester fiber and has excellent durability.

[Example] 167.3 parts of dimethyl terephthalate, 105 parts of tetramethylene glycol, 275 parts of polytetramethylene glycol with a number average molecular weight of 2.000, and 0.2 parts of tetrabutyl titanate were charged into a reactor, and heated at 190°C in an indoor bath. A transesterification reaction was performed. When 70% of the theoretical amount of methanol was distilled off, the temperature of the inner hot water was raised to 200 to 240°C, and the reaction was carried out under weak vacuum for 60 minutes and then under high vacuum for 200 minutes.

Here, 3.5 parts of Irganox 1010 (manufactured by Ciba Geigy) and 0.21 parts of Tinuvin 327 (manufactured by Ciba Geigy) were added as stabilizers, and the reaction was terminated after stirring for 20 minutes. After the produced Pro-Tsuku copolymerized polyether polyester was pelletized, the pellet was dried for 26 hours.
Elastic yarn 404e/1 fil of block copolymerized polyether/polyester was obtained by melt spinning at 5°C.

The elastic yarn was twisted into a polyester false twisted crimped yarn (75 de/3
A covering yarn (b) coated with 6fill (a) was obtained. Similarly, polyester false twisted crimped yarn (75de/24f
A covering yarn (d) coated with il) (c) was obtained.

Using the false twisted crimped yarn (fa) as the weft and the covering yarn (b) as the warp, a fabric (gray fabric of el) was obtained by weaving in a 2-part 3-twill structure. Using the same yarn as the fabric <el A gray fabric (f) was obtained by weaving in a plain weave. Using the false twisted crimped yarn (C) as the weft and the covering yarn (d) as the warp, weaving was carried out in a two-part, three-twill weave to obtain a fabric. The gray fabric (g) was obtained.The gray fabric (e)
(f) (g) Scour and relax (90℃, 3
0 seconds), drying (pin tenter), presetting (60℃,
30 seconds>, dyeing, drying, final set (160℃,
30 seconds) for finishing.

At this time, the Ori! Regarding PII (el), the finishing dimensions were changed to make the fabric of Comparative Example 1 (e-21) higher in density, the fabric of Comparative Example 2 (e-3) in lower density, and the fabric of the present invention with an appropriate density. The fabric of Example (e-1), the fabric of Comparative Example 3 (#l) and the fabric of Comparative Example 4 (g) with appropriate density were obtained.

Overall-type dustproof clothing with the same pattern was created using the five types of fabrics. Table 1 shows the results of testing the performance of the fabric and the dustproof clothing.

The test methods for air permeability, elongation rate, and dust permeability were as described above. The dust-producing test was carried out by stretching the dust-proof clothing to 165 cm.
, was worn by a 30-year-old man weighing 60 kg (wearing cotton underwear) in a clean room (width 661 x depth 53
Arm swing walking (12
The dust concentration (0.3 μm or more) in the clean room when the dust is moving (0 steps/min) is shown as a value measured with a light scattering particle counter. The feeling of stuffiness in wearing comfort was expressed by the feeling during the dust generation test described above.

The motility of wearing comfort can be demonstrated by the feeling when performing radio calisthenics.

As shown in Table 1, fabrics for dustproof clothing according to examples of the present invention,
Dust-proof clothing has excellent breathability, elongation rate, and low dust permeability.
It produces less dust when worn and is comfortable to wear. In comparison, Comparative Example 1 has poor breathability and poor wearing comfort (stuffy feeling). Comparative Example 2 has too high air permeability, poor dust permeability, generates a lot of dust when worn, and has a low elongation rate, resulting in poor wearing comfort (mobility). Comparative Example 3 has a flat structure, has a high dust transmittance, and has poor dust generation when worn. In Comparative Example 4, since the single fiber denier of the polyester crimped yarn is thick, the dust permeability is high and dust generation is poor during wearing.

Claims (1)

[Claims] A covering yarn in which an elastic yarn is covered with a polyester crimped yarn having a single fiber denier in the range of 0.5 to 3.0 de is used in at least one direction of the warp direction and the weft direction to improve the fabric surface. is a woven fabric with a twill structure made of the crimped polyester yarn, and the woven fabric has the following conditions: a) Air permeability is 3 to 30 cc/c
Must be within the range of m^2/sec. b) 1.5kg/5cm in the direction using the covering thread
The elongation when a load is applied is in the range of 30 to 100%. c) The transmittance of dust of 0.3 μm or more when stretched by 30% is 30% or less. A fabric for dustproof clothing that satisfies the following.