JP2002161452A - Fabric for cleaner cloth and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fabric for a cleaner cloth capable of solving problems of foulings with dusting or impurities on a surface which is an object of wiping off or in a clean room during the use in the clean room, etc., and to provide a method for producing the fabric. SOLUTION: This fabric for the cleaner cloth is characterized in that the fabric uses a synthetic fiber multifilament yarn, >=40 mass% of the synthetic fiber filament yarn having <=0.6 dtex single filament fineness and assuming a modified cross-section shape is contained and the amount of the residual oligomer is <=0.5% on the mass of fiber (o.m.f.).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is excellent in wiping properties, has low contamination and small amount of dust due to impurities, and has a clear
The present invention relates to a cleaner cloth suitable for use in a room or the like and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, with the improvement in precision in the fields of electronics, precision industry, etc., the need for cleaning tends to be required at an increasingly higher level. An extremely high level of wiping performance is also required for a cleaner cloth used in a clean room as a typical example.

Conventionally, as these cleaner cloths, nonwoven fabrics made of cotton and the like have been widely used, and they have the wiping performance itself. However, since cotton itself is a short fiber, the wiping performance of dirt is small. Although it is excellent in itself, there is a drawback that fine fiber dust easily adheres to the surface to be wiped and remains on the surface to be wiped at the time of work, which becomes equivalent to new dirt. In this case, in order to prevent the drawback that fiber waste remains on the surface to be wiped, there is a measure to use a cleaner cloth containing a solvent.However, the contained solvent remains on the target surface to remove volatile gas. For example, it causes a new problem that it becomes a new pollution source that degrades the performance of the product, or that the object is deteriorated by the solvent. Therefore, in order to prevent the solvent from remaining on the target surface, it is necessary to employ a method of blowing off the solvent and fiber waste with the gas after the wiping operation, which is troublesome. Alternatively, there has been a problem of environmental pollution due to volatile gas.

[0004] To solve the problem of so-called dusting, in which the above-mentioned fiber waste remains, fabrics utilizing ultra-fine synthetic fibers have been marketed as cleaner cloths. However, the oligomers remaining on the fibers after the finishing process of the fabric contaminate the surface to be wiped as impurities, or the oligomers are scattered to clean the fabric.
There was a problem of polluting the inside of the system.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above circumstances, and has excellent wiping performance when used in a clean room or the like, and also improves the problem of contamination of the surface to be wiped due to dust and impurities and the clean room. An object of the present invention is to provide a cloth for cleaner cloth and a method for producing the same.

[0006]

The present invention can solve the above-mentioned problems, and has the following arrangement. 1. CLEANER CLOTH FABRIC USING SYNTHETIC FIBER MULTILAMENTAL FIBERS, INCLUDING 40% by mass or more of synthetic fiber filaments having a single fiber fineness of 0.6 decitex or less and having an irregular cross-sectional shape, and having a residual oligomer amount of 0.5% o. m. f. A cloth for cleaner cloth, characterized by the following. 2. A process of injecting a high-pressure liquid columnar flow onto a fabric made of synthetic fiber multifilament yarn having a single fiber fineness of 0.6 decitex or less and containing 40% by mass or more of synthetic fiber filaments having an irregular cross-sectional shape is performed. The method for producing a cloth for cleaner cloth according to the above item 1, wherein 3. A fabric comprising a synthetic fiber multifilament yarn having a single fiber fineness of 0.6 decitex or less and containing 40% by mass or more of synthetic fiber filaments having an irregular cross-sectional shape is 2 to 6% o. m. f. The method for producing a cloth for cleaner cloth according to the above 1, wherein the alkali treatment is performed under the following conditions.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The cloth for a cleaner cloth of the present invention is a cloth formed of a cloth made of a synthetic fiber multifilament yarn. The type of the synthetic resin constituting the synthetic fiber is not particularly limited, and synthetic resins such as polyester, nylon, vinylon, and polyolefin can be used, and these are spun to form long filament multifilament yarns. I just need. Among them, polyester-based polymers are preferably used. In particular, when a production method in which an alkali treatment described later is employed, polyethylene terephthalate, which is hardly soluble in alkali, is preferable.

As the synthetic fiber filament, a synthetic fiber filament having a single fiber fineness of 0.6 decitex or less and exhibiting an irregular cross-sectional shape (hereinafter sometimes abbreviated as an irregular extra-fine filament) is 40% by mass of the fabric. It is necessary to be contained in an amount of at least 45% by mass, more preferably at least 55% by mass, particularly preferably at least 70% by mass. Since the single-fiber fineness of the extra-fine filament is 0.6 decitex or less, the fiber surface area of the fabric is relatively large, and the voids between the fibers are relatively large. In addition, it is easy to catch dirt substances, thereby realizing excellent wiping properties. If the content of the extra-fine microfilament is less than 40% by mass, the wiping property is reduced, and the stain cannot be reliably removed.

It is important that the cross-sectional shape of the extra-fine microfilament is an irregular cross-section. Since the acute-angled portion of the fiber cross-section has a function of scraping dirt, it is necessary to remove dirt more reliably. You can. The shape of such an irregular cross-section is not particularly limited, but a cross-sectional shape having an acute angle such as a wedge type, a Y type, or a T type is preferable.

As a method for obtaining the above-mentioned extra-fine microfilaments, an ordinary spinning method using a synthetic resin such as polyester, nylon, vinylon or polyolefin may be used. The splitting method is preferred in order to obtain a finer fineness and obtain a desired irregular cross section. In this preferred method, the combination of synthetic resins having different properties is not particularly limited. For example, a combination of synthetic resins having different solubility or heat shrinkage in a drug or a solvent, or a synthetic resin having poor adhesion to each other is used. If it is a combination of resins,
It may be a combination of similar synthetic resins or a combination of different synthetic resins. For example, a yarn composed of split filaments 1 as shown in FIG. 1 is produced by performing composite spinning using an alkali-insoluble polymer-2 and an alkali-soluble polymer-3, and then using an alkali to form an alkali-soluble yarn. By performing the splitting treatment for removing the soluble polymer-3, it is possible to obtain an extra-fine microfilament as shown in FIG. At this time, examples of the poorly soluble alkali-2 polymer include polyethylene terephthalate,
As the alkali-soluble polymer-2, for example, JP-A-1-
A polyethylene terephthalate-based copolyester obtained by copolymerizing an isophthalic acid component having a sulfonic acid group and an ethylene oxide adduct of a bisphenol as described in JP-A-209825 is exemplified.

The structure forming the fabric in the present invention is not particularly limited, and a desired structure is selected from various woven structures and knitted structures within a range that does not impair the object of the present invention. be able to. In addition, when performing the splitting process using the above-mentioned alkali, it is preferable to perform the splitting process after weaving or knitting.

Further, in the present invention, the amount of residual oligomer in the fabric is 0.5% o. m. f. It is important to be less than 0.4% o. m. f. Is more preferred. Where o.
m. f. Is on the mass of fi
It is an abbreviation of ber and indicates the mass of the substance with respect to the mass of the fiber. That is, in the present invention, it is necessary that the mass of the residual oligomer is 0.5% or less based on the mass of the fiber forming the fabric. This is a clean rule
As a part of increasing the wiping accuracy, which has been increasing in recent years with regard to conventional cleaner cloths used in the system, we have conducted a thorough study focusing on impurities present on the surface of the object after wiping. It is based on the knowledge of the present inventors that the transfer of the oligomer contained in the target surface to the target surface as an aggregate of dirt on the micro level greatly contributes. That is, the amount of the remaining oligomer was 0.5% o. m. f. By suppressing the following, impurities on the surface of the object after wiping can be drastically reduced, and wiping accuracy on a micro level is improved. Further, when the amount of the remaining oligomer of the fabric is 0.5
% O. m. f. If it exceeds, not only will the oligomer adhere to the surface of the object to be wiped off, but if it is used in a field requiring cleanliness of air, such as a clean room, the oligomer will be scattered and the air will be cleaned. The degree cannot be maintained.

The above-mentioned residual oligomer of the cloth is present in the synthetic fiber due to the fact that not all of the raw material monomers are completely polymerized in the polymerization reaction of the synthetic resin as the synthetic fiber raw material. Residual oligomers are usually insoluble in water and cannot be removed by ordinary washing methods. Also, when fabrics are treated at a high temperature of about 100 ° C. or higher, oligomers present inside the fibers may emerge on the surface. There is also a large amount of oligomers remaining on the surface of a synthetic fiber fabric obtained by a conventional method.

Therefore, in the production method of the present invention, 0.5% o. m. f. The following processing is performed. As a method of the treatment, there is a method of washing and removing the oligomer by injecting a high-pressure liquid columnar stream onto the fabric and treating it. The process of injecting the high-pressure liquid columnar stream is a process of injecting a liquid such as water through a large number of injection holes onto the cloth at high pressure, and can be performed using a known spunlace facility or the like. As the liquid at this time, water or warm water is generally used because of easy handling. The shape of the injection hole is generally a circular shape, and a large number of holes having a hole diameter of about 0.05 to 1.0 mm, preferably about 0.1 to 0.4 mm are used. Further, as the injection pressure, a pressure of about 49 to 980 kPa is preferably adopted. Injection pressure is 49kPa
If it is less than 980 kPa, the oligomer may not be sufficiently removed. On the other hand, if it exceeds 980 kPa, the impact becomes too large and the quality of the fabric may be impaired, which is not preferable.

When the high-pressure liquid columnar stream is jetted onto the fabric for processing, it is preferable to jet the high-pressure liquid columnar stream while running the fabric. If the high-pressure liquid columnar flow is jetted to the same location for a long time without running the fabric, the fiber may be cut or the fabric may be perforated, which is not preferable. The traveling speed at which the cloth travels may be appropriately adjusted depending on the relationship between the water pressure, the injection hole diameter, and the injection pressure. For example, when the injection hole diameter is 0.1 mm and the injection pressure is 490 kPa, the traveling speed is about 50 m / min. Is preferred.

By this treatment, the amount of the remaining oligomer on the cloth can be reduced, and a kind of relaxing effect is given to the cloth by the high-pressure liquid columnar flow. By increasing the density, stiffness is also given. As a result, a large number of small voids are generated inside the yarn due to the bulging of the yarn, and the voids can hold a large amount of dirt wiped off, so that the wiping efficiency is dramatically improved, and a stiff cloth is obtained. This also has the effect of improving workability during wiping.

In addition to the above-described method of jetting and treating the high-pressure liquid columnar stream, there is a method of reducing the amount of residual oligomers on the cloth by removing the oligomers by treating the cloth with an alkali. The alkaline treatment conditions at this time are 2 to 6% o. m. f. It is necessary to use an amount of alkali. The alkali treatment conditions are 2% o.
m. f. If the amount is less than this, the amount of alkali is insufficient, and the removal of the oligomer becomes insufficient. On the other hand, 6% o. m. f. If it exceeds, the amount of alkali will be excessive and the fiber strength will be reduced, which will hinder practical use. As an example of a specific method of the above alkali treatment, for example, using caustic soda, an aqueous solution having a pH of about 12 is adjusted, a cloth is put therein, and the mixture is stirred at a temperature of about 130 ° C. for about 30 minutes. Good. Regardless of which method is used to reduce the amount of residual oligomer in the fabric, when the fabric is treated at a high temperature by crimping or the like, the amount of the remaining oligomer is reduced after the treatment at such a high temperature. Processing is preferred. This is because, as described above, when the fabric is treated at a high temperature, the oligomer inside the fiber may be exposed on the surface of the fabric.

[0018]

Next, the present invention will be described in detail with reference to examples. In addition, evaluation of the obtained fabric was performed by the following method.

(1) Dust-generating property One sample (size: 1 mx 1 m) after static elimination is put in a tumbler installed in an air-flow vertical type clean bench, and is rotated at a constant rotational speed (10 times / min.). ) To rotate the tumbler,
After a lapse of 10 seconds, 28.3 liters of sample air was sucked in from the inlet for 1 minute, and the particle generation was measured by a particle counter. This measurement was performed on three samples, and the average value per one sample was obtained. Based on the results of these measurements, ◎ indicates that the number of particles having a particle size of 0.5 μm or more is 30 or less, ○ indicates that the number of particles is 30 to 50, Δ indicates that the number is 50 to 100, and X. (2) Residual oligomer amount About 0.5 g of a sample was precisely weighed (A value), the sample was dried at 105 ° C. for 30 minutes, and further dried at 22 ° C. with a vacuum dryer.
a. After drying under reduced pressure at 80 ° C. for 40 minutes, 100 ml of tetrahydrofuran is added and shaking is performed to extract oligomers (30 minutes × 2 times). After the shaken extract was filtered through a glass filter (G4 glass filter, manufactured by Iwaki Glass Co., Ltd.), the filtrate was concentrated and coagulated by a vacuum dryer, and the residue was precisely weighed (referred to as B value) and extracted from the following formula. Find the quantity. Residual oligomer amount = [B / A] × 100%

(3) Wipeability A washed slide glass is prepared, and its central gloss is measured (K1). Next, 0.2 g of tallow is rubbed on a portion of about 2 cm square at the center of the surface of the slide glass to attach dirt. After the sample (cloth for cleaner cloth) is wrapped around a finger to wipe off dirt on the surface of the slide glass, the glossiness is measured again (referred to as K2). From these gloss values, the gloss recovery rate is calculated based on the following formula, and this is used as an index of the wiping property. When the reflection recovery rate is 99% or more, ◎, 95% or more and less than 99%, 、, 85% or more Those with less than 95% were rated as Δ, and those with less than 85% were rated X. Gloss recovery rate (%) = K2 / K1 × 100

(Example 1) Polyethylene terephthalate copolyester (copolymerizable with alkali-soluble) obtained by copolymerizing 72 parts by mass of polyethylene terephthalate (poorly soluble alkali polymer) and 2.5 mol% of 5-sodium sulfoisophthalic acid And 28 parts by mass of a polymer), and the composite spinning is performed to obtain an eight-divided split filament yarn (78 decitex /
48 filaments). The false twisted yarn of this filament yarn is used as a warp and a weft to form a water jet yarn.
Density of 160 / 2.54cm, weft density of 90 /
A plain fabric of 2.54 cm was woven. Next, the fabric was subjected to a 30% weight reduction process using an alkali, and then the pore size was reduced to 0.
Using a span-lace facility (manufactured by Honeycomb) having nozzles in which 15 mm injection holes are staggered in three rows in the width direction of the fabric at intervals of 0.25 mm, while running the fabric at a speed of 5 m / min, The cloth for cleaner cloth of the present invention was obtained by injecting and treating a high-pressure water stream of 25 ° C. at an injection pressure of 490 kPa. In addition, the alkali-soluble polymer was removed by the above-described weight reduction processing, and the filaments were ultrafine fibers having a modified cross section as shown in FIG.
14 decitex). In addition, stiffness was imparted to the fabric by the above-described process of injecting the high-pressure water flow.

(Example 2) As the warp, an eight-split split filament yarn (78 decitex / 48 filament) obtained in the same manner as in Example 1 and a polyethylene terephthalate yarn obtained by a melt spinning method (33 decitex /
12 filaments) and a polyethylene terephthalate yarn (84 dtex / 36 filaments) obtained by a melt spinning method as a weft. 253 lines / 2.
Five satin woven fabrics of 54 cm and a weft density of 88 / 2.54 cm were woven. Next, 17% using alkali for this fabric
(Weight splitting process) was performed. Thereafter, 130 ° C x
The crimping and relaxing treatments were performed under the condition of 30 minutes. In addition, the woven fabric was treated with caustic soda 4% o. m. f. By performing the alkali treatment under the following conditions, a cloth for a cleaner cloth of the present invention was obtained. In addition, stiffness was given to the fabric by the above-described crimping and relaxing treatments.

(Example 3) As a warp, a false twisted yarn of polyethylene terephthalate yarn (84 dtex / 36 filaments) obtained by a melt spinning method was used, and as a weft, a melt spinning method was used. Using a false twisted yarn of the obtained polyethylene terephthalate triangular cross-section filament yarn (122 decitex / 384 filament), a water jet roll has a density of 95 threads / 2.54 cm and a weft density of 140 threads / 2. A .54 cm double-sided satin fabric was woven. Next, the woven fabric was crimped and relaxed at 130 ° C. for 30 minutes. Further, the cloth for cleaner cloth of the present invention was obtained by injecting and treating a high-pressure water stream under the same conditions as in Example 1.

Example 4 The composite false twisted yarn used as the warp in Example 2 was knitted by a circular knitting machine at a gage number of 24 G to obtain a smooth knitted product. Then, the fabric was subjected to a 21% weight reduction process (split treatment) using an alkali. Thereafter, crimping and relaxing treatment were performed at 130 ° C. for 30 minutes. Furthermore, the cloth for a cleaner cloth of the present invention was obtained by performing an alkali treatment under the same conditions as in Example 2.

(Example 5) When performing the high pressure liquid columnar flow treatment, the injection hole diameter was 0.10 mm, and the injection pressure was 390 kPa.
A cloth for cleaner cloth of the present invention was obtained in the same manner as in Example 1 except for the above.

Comparative Example 1 A comparative cloth for a cleaner cloth was obtained in the same manner as in Example 1 except that the treatment was not performed by jetting a high-pressure water stream.

Comparative Example 2 Caustic soda 4% o. m. A cleaner cloth for comparison was obtained in the same manner as in Example 2 except that the alkali treatment was not performed under the condition f.

(Comparative Example 3) As the warp, a false twisted yarn of polyethylene terephthalate yarn (84 dtex / 36 filaments) obtained by a melt spinning method was used, and as the weft, the warp in Example 2 was used. Using a composite false twisted yarn used as a slab, a warp density of 300 yarns / 2.
Five satin woven fabrics of 54 cm and a weft density of 70 / 2.54 cm were woven. Next, the fabric was subjected to a 5% weight reduction process (split treatment) using an alkali. Thereafter, 130 ° C x 3
The crimping and relaxing treatment was performed under the condition of 0 minutes. In addition, the woven fabric was treated with caustic soda 1% o. m. f. By performing an alkali treatment under the conditions described above, a cloth for comparative cleaner cloth was obtained.

Examples 1 to 5 and Comparative Examples 1 to 5 described above.
The structure and properties of the cloth for cleaner cloth obtained in No. 3 are shown in Table 1 below.

[0030]

[Table 1]

From the results shown in Table 1, it can be seen that the cloths for cleaner cloths obtained in Examples 1 to 5 have not only good wiping properties but also little dust and no residual oligomer from the cloths, and a clean room. It was suitable as a wiping cloth used inside. Among them, the one of Example 1 was particularly excellent. On the other hand, in Comparative Examples 1 and 2, a treatment for reducing residual oligomers such as a high-pressure liquid column flow treatment or an alkali treatment was not performed, so that there were many residual oligomers on the fabric, and the fabric was used in a clean room. It was not suitable. In Comparative Example 3, the wiping property was poor due to the low content of the extra-fine microfilament, and the alkali treatment condition in the last step was 2% o. m. Since it was less than f, the result was that the amount of the remaining oligomer was large.

As described above, the cloth for cleaner cloth of the present invention exhibits excellent wiping properties against dirt, and does not contaminate the object to be wiped by dust generated from the cloth itself or residual oligomer. Cleanle
Since it does not pollute the environment in the system, it is particularly suitable for a cleaner cloth used in a clean room in a field where precision is required. Further, according to the production method of the present invention, such a cloth for a cleaner cloth can be easily produced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of the form of a filament in a split yarn that may be used in the present invention.

FIG. 2 is a cross-sectional view showing an example of a form of an extra-fine microfilament which may be used in the present invention.

[Explanation of symbols]

 1. Split yarn 2. 2. Alkali poorly soluble polymer 3. Alkali easily soluble polymer Extra-fine filament

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D04B 1/16 D04B 1/16 21/00 21/00 B D06B 19/00 D06B 19/00 Z D06M 11 / 38 D06M 5/02 B F term (reference) 3B074 AA02 AB01 3B154 AA07 AA17 AA20 BA12 BA17 BB35 BF07 BF12 BF27 DA06 DA28 DA30 4L002 AA07 AB05 AC04 AC07 BA00 BA01 DA00 DA01 DA05 FA00 FA06 4L031 AA12A05 AB01 AA12A30 AB05 AA32 AA35 AA37 AB07 AB21 AC19 BA01 BA02 CA15 DA21 DA24 EA01 EB00 EB04 EB05

Claims (3)

[Claims] Claims 1. A cleaner cloth using a synthetic fiber multifilament yarn, comprising at least 40 mass% of synthetic fiber filaments having a single fiber fineness of 0.6 decitex or less and exhibiting an irregular cross-sectional shape, 0.5% o. m. f. A cloth for cleaner cloth, characterized by the following. 2. A high-pressure liquid columnar flow is applied to a fabric comprising a synthetic fiber multifilament yarn having a single fiber fineness of 0.6 decitex or less and 40% by mass or more of synthetic fiber filaments having an irregular cross-sectional shape. The method for producing a cloth for a cleaner cloth according to claim 1, wherein a spraying process is performed. 3. A fabric comprising a synthetic fiber multifilament yarn having a single fiber fineness of 0.6 decitex or less and containing 40% by mass or more of synthetic fiber filaments having an irregular cross-sectional shape, 2 to 6% o . m. f. The method for producing a cloth for a cleaner cloth according to claim 1, wherein the alkali treatment is performed under the following conditions.