JPS61266653A - Dustless clothing - 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 (Field of Industrial Application) The present invention relates to dust-free clothing, and more particularly to dust-free clothing that does not get stuffy when worn because it is breathable.

(Prior art) Conventionally, dust-free clothing used in clean rooms has been made of base fabric (for example, polyester pile), taking into account that it has high dust passage prevention performance, is difficult to attract dust, and has low dust generation. etc.), and in order to prevent dust generated from the human body, underwear, etc. from leaking out to the outside, a design is adopted in which the neck, cuffs, ankles, etc. are tightly attached to the body.

(Problems to be Solved by the Invention) The fabric used in such dust-free clothing has a flat structure, and in order to improve dust-collecting properties, K needs to have a high weave density. It has poor breathability, and furthermore, due to its design, it tends to get stuffy when worn, resulting in poor wearing comfort.

It is an object of the present invention to provide dust-free clothing that eliminates these drawbacks and is comfortable to wear.

(Means for Solving the Problems) The present invention is characterized in that polyurethane elastic filaments each having a single fiber diameter of 50 μm or less are laminated without being substantially bundled.
This is a dust-free garment in which a polyurethane nonwoven fabric made of filaments joined together by the filaments themselves is used as at least a part of the A1 material.

The polyurethane nonwoven fabric used in the present invention is preferably one obtained by spinning a known thermoplastic polyurethane elastomer by a melt blow method. Such polyurethane elastomers usually contain a low melting point polyol with a molecular weight of 500 to 6,000, such as dihydroxy polyether, dihydroxy polyester, dihydroxy polycarbonate, dihydroxy polyester amide, etc., and an organic diisocyanate with a molecular weight of 500 or less, such as P,P-diphenylmethane diisocyanate, diisocyanate, inphorone diisocyanate, hydrogenated diphenylmethane diisocyanate, xylylene diisocyanate, 2,6-diycyanatomethyl caproate, hexamethylene diisocyanate, trans-'1,4 cyclohexane diisocyanate, and the like.

It is a polymer obtained by reaction with a chain extender having a molecular weight of 600 or less, such as a glycol, an amino alcohol or a triol. Among these polymers, particularly good ones include polytetramethylene glycol,
Or polyurethane using polyC-caprolactone, polyhexamethylene adipate or polybutylene adipate.

Moreover, P,P'-diphenylmethane diincyanate is suitable as the organic diisocyanate. Further, as the chain extender, P,P'-bishydroxyethoxybenzene and 1,4-butanediol are suitable.

The polyurethane nonwoven fabric used in the present invention is one in which constituent polyurethane elastic filaments are spread and laminated over substantially the entire length of the yarn without joining.

If the monofilaments are not opened and joined together in a focused manner, the flexibility of the nonwoven fabric will be significantly impaired. The monofilament must have an average diameter of 50 .mu.m or less, preferably 80 .mu.m or less, and particularly preferably 20 .mu.m or less on average. Furthermore, the diameter of one monofilament may vary, but it is desirable that the diameter is 50 μm or less even in the maximum case. When the diameter of the monofilament increases, the nonwoven fabric becomes rough and rigid, and its dust-trapping ability decreases.

Furthermore, the polyurethane nonwoven fabric used in the present invention is laminated with polyurethane elastomer filaments. The contact points between the fibers forming the unit are joined by the fibers themselves. Such a bonded state can be achieved by thermally fusing the polyurethane elastic fibers together. Methods using solvents or other adhesives are not preferred because they reduce the air permeability and flexibility of the nonwoven fabric. However, an adhesive may be used in combination without impairing these properties. Alternatively, after spinning, the fibers may be partially joined using an embossing roller or the like.

The present invention (the date of the polyurethane nonwoven fabric used is 25
~200p/j'' is preferable, and particularly preferably 5
It is 0 to 150p/male. If the basis weight is smaller than this, K
There is a tendency for the collection rate of Fi dust to decrease, and when the date is large, the drapability of the dust-free garment decreases. Furthermore, it is preferable that the polyurethane nonwoven fabric used in the present invention has antistatic properties;
40 inch RH is suitable. A polyurethane nonwoven fabric having such antistatic properties has a 4 [characteristic &! ! ! It is obtained by entraining fibers with a high-speed air current, depositing and collecting them together with polyurethane elastic fibers in a sheet form, and containing 0.06 to 5% by weight of the conductive fibers.

It can be obtained either by kneading and spinning an antistatic agent or by subjecting a nonwoven fabric to antistatic processing.

The dust-free garment of the present invention uses the above-mentioned polyurethane nonwoven fabric as a base fabric, but it can of course be used alone or in combination with a polyurethane nonwoven fabric and a fabric with antistatic properties made of inelastic fibers. . In this case, it is preferable to use the polyurethane nonwoven fabric in areas of the body that are prone to stuffiness, such as the head, ears, mask, armpits, chest, flanks, back, cuffs, ankle hems, and the like. In addition, as the antistatic fabric made of inelastic fibers, knitted fabrics, woven fabrics, or nonwoven fabrics of nylon, botanical fiber, riemeter, polyolefin, etc. are used. Fabrics are particularly suitable.

Known methods can be used to impart stability to these fabrics. For example, suitable methods include a method using filaments mixed and spun with an antistatic agent, a method of mixing and weaving conductive fibers, a method of applying antistatic processing to the fabric, and a method of applying a metal film to the fabric by plating or vapor deposition. be.

Further, it is also suitable to use a laminate obtained by laminating a polyurethane nonwoven fabric and an inelastic fiber as the base fabric. Lamination can be done by any known method, but the best method is to apply hot melt adhesive in dots and heat to join.
This is preferable because it does not impair breathability and flexibility.

(Function) One of the important features of the polyurethane nonwoven fabric used in the present invention is that the nonwoven fabric has extremely high breaking strength and elongation, and has excellent elastic performance. This is because the performance of the polyurethane elastic fibers that make up the nonwoven fabric is directly reflected. This is a performance that cannot be obtained. For example, the elongation at break of the polyurethane nonwoven fabric used in the present invention is usually 200% or more, preferably 800% or more.
*It is different from the thickness K of the cow woven cloth, but it is usually 0.4 icg/cI! L or more, preferably 1. O#/
It is greater than or equal to α. Also, recovery when extended by 50 inches: 4A is usually 8
It is 6 inches or more, preferably 90 inches or more.

Another feature of the polyurethane nonwoven fabric used in the present invention is that it has extremely high flexibility. Bending resistance of nonwoven fabric (J
The 46 degree cantilever method of ISL-1096 increases as the basis weight of the nonwoven fabric increases, but the nonwoven fabric of the present invention has a weight of y< o, gx+g.

The preferred range is y < 0.2X + 20. This feature is achieved by the physical properties of the polyurethane elastic body, the structure of the nonwoven fabric of the present invention as described above, and the small diameter of the constituent fibers.

Furthermore, a feature of the polyurethane nonwoven fabric applied to the present invention is that it has extremely high air permeability.
'', it has an air permeability of 400-Δ1/-1 or more.

In addition, one of the features of the polyurethane nonwoven fabric used in the present invention is that it has good dust-trapping properties despite its high air permeability. This is thought to be due to the fact that the fine denier filaments that make up the polyurethane nonwoven fabric have a three-dimensional network structure, which causes so-called three-dimensional filtration, and that the polyurethane fibers themselves have adhesion to dust. Ru.

(!! Construction side The present invention will be explained in more detail with reference to examples below.
Measurement of various physical property values was performed using the following methods.

Breaking strength and elongation: JISL-10 for a 2cm wide sample
Same as 96K, grip interval 5CIL, tensile speed 10cr
! Stretch as L/- and measure the strength and elongation per strand at break.

60 inch elongation recovery rate: Grasp a sample with a width of 21 cm, with an interval of 5 cm,
It is stretched by 50tI6 at a tensile rate of 101/- and immediately recovered to its original length at the same rate. The residual elongation lca is determined from the recorded load-elongation curve, and the 50% elongation recovery rate is calculated using the following formula.

50-inch elongation recovery rate (excellent) = -resistance: two-way XIQO2,5 Bending resistance: According to the 45'' cantilever method of JIS L-1096.

Air permeability: A JISL-1096 7 radial type tester was used.

Elongation rate: According to the JISL-1096 constant load method for stretch fabrics, the elongation rate is measured after applying a load of 1 c 1.5 # of a sample having a width of 51 and leaving it for 1 minute.

Dust collection rate 2 The particle size distribution of dust in the atmosphere and the particle size distribution after removing dust through the sample were measured 10 times each using a particle counter (Rion KM-02), and the nine average values were determined by Chikishima et al. The dust collection rate was calculated using the following formula.

C1 Secondary dust concentration C2 Secondary dust concentration, lj! Example roadside, P-diphenylmethane diisocyanate, molecular weight 1
This Ig melting giblow uses pellets of polyurethane elastic material consisting of polytetramethylene glycol of 0.000 and 1.4-butanediol as raw material, and has slits for injection of heated gas on both sides of nozzles with a diameter of 0.811 arranged in a row. Melting tIA degree using spinning equipment 245° 0 per minute per nozzle
．． The polymer was discharged at a rate of 611, and the heated air was injected through the slit at a pressure of 8.5#/1ml to atomize the filament.
It was collected on a conveyor made of 80 mesh wire mesh installed in cIL, and taken over by Mr. L using a roller to obtain a nonwoven fabric.

This nonwoven fabric had seven filaments of polyurethane elastic fibers opened and laminated, and the intertwining points between the filaments were joined by fusion. The physical properties of this nonwoven fabric were as follows.

With eyes
86.2 II/♂ pull ia strong 0.790kg/
l:* Elongation at break 780 cm 100 cm Elongation recovery rate 92% Bending resistance 81 tm Average single fiber diameter 20μ Air permeability 4 Q Q cx8Δ-/
The collection rate of this nonwoven fabric on the base board was as follows.

Table 1: When I sewed clean room jumpsuits and 7-shirts using this nonwoven fabric and wore them, the elasticity made it easy for the body to move and it did not get stuffy even after a long period of time.

Example 2 A polyurethane nonwoven fabric having a weight of 85 g/m' was produced using the method of Example 1, increasing the pressure of the heated gas injected from the slit to 4wi, and using filaments having the diameters shown in Table 2. The dust particle collection rate of each nonwoven fabric with a size of 6 μm or more was as follows.

Table 2 also shows air permeability (7 Lazille method) of 400cx8/
It was more than Ca2/see.

Example 8 The polyurethane nonwoven fabric having an average single fiber diameter of 80 μm obtained in Example 2 was laminated in a sandwich-like manner between two sheets of 28-gauge polyester tricot, and the fabric was joined together with hot melt adhesive applied in dots. The physical properties of this product j are as follows.

Elongation rate 66q6 50 inch elongation recovery rate 90% a 9K It 40 cm3/cIL2/w
c5μm dust collection rate 100 Chi particles
8 pieces/l Using this laminate, clean room jackets and pants can be used.
m! 1Ili! When I wore Shi1, it was comfortable to wear due to its elasticity and did not get stuffy even after long hours of work.

Example 4 A high-density fabric (warp A75D/86f) made of antistatic polyester was fabricated by weaving conductive polyester filaments composite-spun with carbon particle-containing components into 4 yarns at 10 pitches.
Used for lA150D/48f)'! I sewed jumpsuits and 7-shirts for the junior room.

The air permeability of this high-density fabric is 12 Ca3/cxi27w
It was g. When I did light work wearing it in a clean room, I immediately felt extremely hot and had to take a break after two hours.

When the same high-density fabric is used to make 1 am+ jumpsuit and 7-do with the same design, the average single 11 obtained in Example 2 is applied to the ears of 7-do, the armpits, and the hem of the 7-do.
A 1M polyurethane nonwoven fabric with a diameter of 5 μm was used. When this jumpsuit and 7-D were worn in a clean room, they did not get stuffy even after long hours of work.

(Effects of the Invention) As described above, the dust-free clothing of the present invention does not allow the release of heat from the human body to the outside, and is highly breathable, so when worn rolled up, it does not get stuffy and sticky, allowing you to work comfortably. Is possible.

Claims (3)

[Claims] (1) A polyurethane nonwoven fabric in which polyurethane elastic filaments with an average single fiber diameter of 50 μm or less are laminated without being substantially bundled, and the laminated filaments are joined by the filaments themselves is used as at least a part of the constituent material. Clean clothing. (2) The dust-free garment according to claim 1, wherein the average single fiber diameter of the polyurethane elastic filaments is 20 μm or less. (3) The dust-free garment according to claim 1, wherein the constituent material is a sheet formed by laminating and bonding a polyurethane nonwoven fabric and at least one fabric having antistatic properties made of inelastic fibers.