JP4488617B2 - Manufacturing method of cloth for cleaner cloth - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
Excellent in the present invention is wiping performance, less pollution and dust generation due to impurities, chestnut - Nru - a process for producing a cleaner cloth cloth suitable for use in the beam or the like.
[0002]
[Prior art]
In recent years, with the improvement of precision in the fields of electronics, precision industry, etc., the need for cleaning has tended to be demanded at a higher level. For example, in the manufacturing process of hard disks and the like, -The cleaner cloth used in the room is also required to have a very high level of wiping performance.
[0003]
Conventionally, as these cleaner cloths, non-woven fabrics made of cotton are often used, and there is wiping performance itself, but since cotton is a short fiber in the form of the material itself, dirt wiping performance itself is excellent However, there is a drawback that fine fiber scraps are likely to adhere to the surface to be wiped and remain during the operation, which corresponds to new dirt. In this case, in order to prevent the disadvantage that fiber scraps remain on the surface to be wiped off, there is a measure to use a cleaner cloth with a solvent, but the included solvent remains on the surface and the volatile gas is removed. This causes new problems such as generation of new contamination sources that deteriorate the performance of the product and deterioration of the object due to the solvent. Therefore, in order to prevent the solvent from remaining on the target surface, it is necessary to take a method of blowing off the solvent and fiber waste with gas after the wiping work, and there is a problem that it takes time. There was also a problem of environmental pollution by volatile gases.
[0004]
In order to solve the so-called dust generation problem that the above-mentioned fiber waste remains, fabrics using ultrafine fibers of synthetic fibers are also put on the market for cleaner cloths. However, there is a problem that the oligomer remaining on the fiber after the finishing process of the fabric contaminates the surface to be wiped as an impurity, or the oligomer is scattered to contaminate the inside of the clean room.
[0005]
[Problems to be solved by the invention]
In view of the above situation, provides the use of a clean room or the like, wiping with excellent performance, the production method of the cleaner cloth fabric for improving the contamination problems of the target surface and a clean room wipe according dust and impurities It is an object to do.
[0006]
[Means for Solving the Problems]
The present invention can solve the above-described problems and has the following configuration.
A fabric knitted and woven with split filament yarns consisting of a hardly alkali-soluble polymer and an alkali-soluble polymer is subjected to split processing to remove the alkali-soluble polymer by splitting with alkali, and the single fiber fineness is After forming a fabric containing 40% by mass or more of synthetic fiber filaments having a shape of 0.6 decitex or less and having an irregular cross-sectional shape , water is removed from the injection hole at a pressure of 49 to 980 kPa at a pressure of 49 to 980 kPa. by performing a process of injecting a remaining fabric oligomers - the amount of 0.5% o. m. f. The manufacturing method of the cloth for cleaner cloth characterized by the following .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
The cloth for cleaner cloth obtained by the present invention is a cloth formed of a cloth made of synthetic fiber multifilament yarn. The type of 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 multifilament yarns of long fibers. That's fine. Of these, polyester polymers are preferably used, and polyethylene terephthalate, which is hardly soluble in alkali, is particularly preferable because an alkali treatment described later is performed.
[0008]
As the synthetic fiber filament, a synthetic fiber filament having a single yarn fineness of 0.6 dtex or less and an irregular cross-sectional shape (hereinafter sometimes abbreviated as an irregularly shaped ultrafine filament) is 40% by mass or more based on the mass of the fabric. It is necessary to be included, 45% by mass or more, further preferably 55% by mass or more is preferable, and 70% by mass or more is particularly preferable. Since the single-filament fineness of the deformed ultrafine filament is 0.6 dtex or less, there is an effect of relatively increasing the fiber surface area of the fabric and relatively increasing the space between the fibers, so that the contact area with the dirt is increased. In addition, it is easy to trap dirt substances and realizes excellent wiping properties. If the content of the deformed extra fine filament is less than 40% by mass, the wiping property is deteriorated, and the dirt cannot be removed reliably.
[0009]
In addition, it is important that the cross-sectional shape of the above-mentioned deformed ultrafine filament is a deformed cross-section, and this makes it possible to remove the dirt more reliably because the sharp portion of the fiber cross-section has a function of scraping off the dirt. . The shape of the irregular cross section is not particularly limited, but a cross section having an acute angle such as a wedge shape, a Y shape, or a T shape is preferable.
[0010]
As a method for obtaining a variant ultrafine filaments as described above, employs a method of split fiber process by conjugate spinning the characteristics of different synthetic resin, the yarn made of, for example, Wari繊filament 1 shown in FIG. 1, It is manufactured by performing composite spinning using the hardly alkali-soluble polymer-2 and the easily alkali-soluble polymer-3, and then by performing a split fiber treatment for removing the easily alkali-soluble polymer-3 using an alkali, FIG. It is possible to obtain a deformed ultrafine filament as shown in FIG. Examples of the hardly alkali-soluble polymer-2 at this time include polyethylene terephthalate, and examples of the easily alkali-soluble polymer-2 include sulfonic acid groups as described in JP-A-1-209825. And polyethylene terephthalate copolyester obtained by copolymerization of an isophthalic acid component having a bisphenol and an ethylene oxide adduct of bisphenols.
[0011]
In addition, the structure forming the fabric in the present invention is not particularly limited, and a desired structure can be selected from various woven structures, knitted structures, and the like within a range not impairing the object of the present invention. .
In addition, when performing the split fiber process using the above-mentioned alkali, it is preferable to perform the split fiber process after weaving or knitting.
[0012]
Furthermore, in the present invention, the remaining oligomer amount of the fabric is reduced to 0.5% o. m. f. It is important to less, 0.4% o. m. f. Is more preferable. Where o. m. f. Is an abbreviation for on the mass of fiber and indicates the mass of the substance relative to the mass of the fiber. That is, it is necessary that the mass of the remaining oligomer with respect to the mass of the fiber forming the fabric obtained by the method of the present invention is 0.5% or less. This is the result of intensive studies focusing on impurities present on the surface of the object after wiping as part of the improvement in wiping accuracy that has recently been increasing with regard to conventional cleaner cloths used in clean rooms. These impurities are due to the knowledge of the present inventors that the oligomer contained in the cleaner cloth greatly contributes to the migration to the target surface as a collection of micro-level dirt. That is, the remaining oligomer amount was 0.5% o. m. f. By suppressing to the following, impurities on the surface of the object after wiping can be drastically reduced, and the wiping accuracy at the micro level is improved. Also, the remaining oligomer amount of the fabric is 0.5% o. m. f. Exceeding the adhesion of the oligomer to the surface of the object to be wiped, when used in a field that requires cleanliness of air such as a clean room, the oligomer is scattered and the air is cleaned. The degree cannot be maintained.
[0013]
Residual oligomers of the above-described fabric are present in the synthetic fiber due to the fact that all the raw material monomers are not completely polymerized in the polymerization reaction of the synthetic resin that is the synthetic fiber raw material. Residual oligomers are usually insoluble in water, so they cannot be removed by ordinary washing methods, and when the fabric is treated at a high temperature of about 100 ° C. or higher, oligomers present inside the fibers are raised on the surface. There are also many oligomers remaining on the surface of a synthetic fiber fabric obtained by a conventional ordinary method.
[0014]
Therefore, in the production method of the present invention, the remaining oligomer of the fabric is 0.5% o. m. f. The following processing is performed. As a method for the treatment, the oligomer is washed away by spraying a high-pressure liquid columnar flow onto the fabric . The process of injecting this high-pressure liquid columnar flow is a process of injecting water onto the fabric at a high pressure through a large number of injection holes, 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. As the shape of the injection hole, a circular shape is generally used, and a large number of holes having a hole diameter of 0.05 to 1.0 mm, preferably about 0.1 to 0.4 mm are arranged and used. As the injection pressure, the pressure of 49~980kPa is adopted. If the injection pressure is less than 49 kPa, the oligomer may not be sufficiently removed. On the other hand, if it exceeds 980 kPa, the impact becomes too great and the quality of the fabric may be impaired.
[0015]
When the high-pressure liquid columnar flow is jetted and processed on the fabric, it is preferable to jet the high-pressure liquid columnar flow while the fabric is running. If a high-pressure liquid columnar flow is jetted to the same place for a long time without running the fabric, it is not preferable because fibers may be cut or the fabric may be perforated. The running speed for running the fabric 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 running speed is about 50 m / min. Is preferred.
[0016]
This treatment can reduce the amount of remaining oligomers in the fabric, and gives the fabric a kind of relaxing effect due to the high-pressure liquid columnar flow. By doing so, the stiffness is also given. Therefore, when the yarn swells, a large number of narrow voids are generated inside the yarn, and the voids can wipe up a large amount of dirt, so that the wiping efficiency is dramatically improved, and a firm fabric is obtained. This also has the effect of improving workability during wiping.
[0017]
All dishes, residual oligomer - removing the quantity, when treated fabric at an elevated temperature in the crimping process or the like, after treatment with such a high temperature, it is preferable to perform. This is because, as described above, when the fabric is treated at a high temperature, the oligomer inside the fiber may be raised on the surface of the fabric.
[0018]
【Example】
Next, the present invention will be specifically described with reference to examples. In addition, evaluation of the obtained fabric was performed by the following method.
[0019]
(1) Place one sample (size: 1m x 1m) after dust-generating static elimination in a tumbler installed in a vertical airflow clean bench and tumbler at a constant rotational speed (10 times / minute) -After rotating for 10 seconds, 28.3 liters of sample air was sucked from the inlet in one minute, and dust generation was measured by a particle counter. This measurement was performed on three samples, and an average value per sheet was obtained. Based on these measurement results, the number of particles with a particle size of 0.5 μm or more is 30 or less, ◎, 30 to 50 is ◯, 50 to 100 is △, and 100 or more. X.
(2) A sample with a residual oligomer amount of about 0.5 g is precisely weighed (referred to as A value), the sample is dried at 105 ° C. for 30 minutes, and further dried under reduced pressure at 22 Pa and 80 ° C. for 40 minutes. Then, 100 ml of tetrahydrofuran is added and shaken to extract the oligomer (30 minutes × 2 times). After the shaken extract is filtered through a glass filter (G4 glass filter, manufactured by Iwaki Glass Co., Ltd.), the filtrate is concentrated and solidified in a vacuum dryer, and the residue is precisely weighed (referred to as B value) and extracted from the following formula Find the amount.
Residual oligomer amount = [B / A] x 100%
[0020]
(3) Wipeability A slide glass that has been cleaned is prepared, and the glossiness at the center is measured (referred to as K1). Next, 0.2 g of beef tallow is rubbed on a 2 cm square portion at the center of the surface of the slide glass to attach dirt. A sample (cleaner cloth cloth) is wound around a finger to wipe off the dirt on the surface of the slide glass, and then the glossiness is measured again (referred to as K2). The glossiness recovery rate based on the following formula is obtained from these glossinesses, and this is used as an index of wiping property. The reflectance recovery rate is 99% or more, ◎, 95% or more and less than 99%, ○, 85% or more. Less than 95% was evaluated as Δ, and less than 85% as ×.
Glossiness recovery rate (%) = K2 / K1 × 100
[0021]
Example 1
Alternating 72 parts by mass of polyethylene terephthalate (poorly alkali-soluble polymer) and 28 parts by mass of polyethylene terephthalate copolyester (alkali-soluble polymer) copolymerized with 2.5 mol% of 5-sodium sulfoisophthalic acid The resultant was subjected to composite spinning to obtain an 8-divided split filament yarn (78 dtex / 48 filament) having a filament cross section as shown in FIG. By using the false twisted yarn of the filament yarn as warp and weft, a plain woven fabric having a warp density of 160 yarns / 2.54 cm and a weft density of 90 yarns / 2.54 cm was woven using a water jet room. Next, the fabric was subjected to a 30% weight reduction process using an alkali, and then a span race provided with nozzles in which injection holes having a hole diameter of 0.15 mm were arranged in three rows in a zigzag manner in the width direction of the fabric. Using the equipment (manufactured by Honeycomb), the fabric was run at a speed of 5 m / min and sprayed with a high-pressure water flow of 25 ° C. at a jetting pressure of 490 kPa, thereby obtaining the cloth for cleaner cloth of the present invention. .
In addition, the alkali-soluble polymer was removed by the above-described weight reduction processing, and the filament was split into ultrafine fibers (single fiber fineness 0.14 dtex) having an irregular cross section as shown in FIG.
In addition, the fabric was given firmness by the above-described treatment of spraying the high-pressure water flow.
[0023]
(Example 2 ) As the warp, a false-twisted yarn of polyethylene terephthalate yarn (84 dtex / 36 filament) obtained by the melt spinning method was used, and as the weft, obtained by the melt spinning method. Polyethylene terephthalate triangular cross-section filament yarn (122 dtex / 384 filament) false twisted yarn with water jet room warp density of 95 / 2.54 cm, weft density of 140 / 2.54 cm A double-sided satin fabric was woven. Next, the fabric was crimped and relaxed under conditions of 130 ° C. × 30 minutes. Furthermore, the cloth for cleaner cloth of this invention was obtained by injecting and processing a high-pressure water stream on the same conditions as Example 1. FIG.
[0025]
(Example 3 ) A cloth for a cleaner cloth of the present invention was obtained in the same manner as in Example 1 except that the diameter of the injection hole during the high-pressure liquid columnar flow treatment was 0.10 mm and the injection pressure was 390 kPa.
[0026]
(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 carried out by jetting a high-pressure water stream.
[0029]
Table 1 below shows the configurations and characteristics of the cloths for cleaner cloth obtained in Examples 1 to 3 and Comparative Example 1 described above.
[0030]
[Table 1]
[0031]
From the results shown in Table 1, the cloths for cleaner cloth obtained in Examples 1 to 3 are used in a clean room, in addition to good wiping properties, little dust generation from the cloth and residual oligomers. It was suitable as a wiping cloth. Among them, the example 1 was particularly excellent. Oite in Comparative Example 1 with respect to this, because they did not perform the processing for reducing the residual oligomers by high pressure liquid columnar streams treatment, the fabric of the remaining oligomer - a number, chestnut - Nru - not suitable for use in the arm Met.
【The invention's effect】
As described above, the cloth for the cleaner cloth obtained by the present invention exhibits excellent wiping property against dirt, and does not contaminate the object to be wiped off by dust generation or residual oligomer from the cloth itself. -It is suitable for a cleaner cloth used in a clean room, particularly in a field where precision is required, because it does not pollute the environment inside. Moreover, according to this invention , such a cloth for cleaner cloth can be manufactured easily.
[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 the shape of a deformed ultrafine filament that may be used in the present invention.
[Explanation of symbols]
1. Split yarn 2. 2. Alkali poorly soluble polymer 3. Alkali-soluble polymer Deformed ultrafine filament

Claims (1)

A fabric knitted and woven with split filament yarns consisting of a hardly alkali-soluble polymer and an alkali-soluble polymer is subjected to split processing to remove the alkali-soluble polymer by splitting with alkali, and the single fiber fineness is After forming a fabric containing 40% by mass or more of synthetic fiber filaments having a shape of 0.6 decitex or less and having an irregular cross-sectional shape , water is removed from the injection hole at a pressure of 49 to 980 kPa at a pressure of 49 to 980 kPa. by performing a process of injecting a remaining fabric oligomers - the amount of 0.5% o. m. f. The manufacturing method of the cloth for cleaner cloth characterized by the following .