JP2008302043A - Wiping cloth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiping cloth suppressing small flaws such as scratch by appropriately distributing a pushing pressure liable to be concentrated in a limited part, and exerting superior dust collecting property and little self dusting property in wiping work by having superior water absorbing property, wiping property and an appropriate bulkiness. <P>SOLUTION: This wiping cloth is formed by weaving and knitting using a yarn which is formed by combining a false-twisted and crimped synthetic fiber multifilament A with a single yarn fineness of not less than 0.1 dtex and not more than 0.7 dtex, with synthetic fiber multifilament B with the single yarn fineness of not less than 1.0 dtex and not more than 3.0 dtex, in at least a part thereof and has a given specific volume. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wiping cloth suitable for wiping optical lenses, precision instruments, etc., and more particularly to a wiping cloth having high water absorption performance and excellent wiping performance as well as low dust generation. It is.

  Conventionally, wiping cloths have been widely used in general households such as cleaning cloths, eyeglasses and lens wipes, but most of them are made of cellulose fibers such as cotton, rayon and cupra, which have high water absorption. In recent years, wiping cloth has been increasingly used in clean room operations such as the semiconductor industry, other precision equipment manufacturing / assembly industries, and optical equipment manufacturing / assembly industries. In addition to the properties, there is a demand for low dust generation.

In clean room use, there is a description of a wiping cloth made of a disposable nonwoven fabric (see, for example, Patent Documents 1 and 2). Compared to a wiping cloth made of woven or knitted fabric, the price is low. However, when wiping with a strong pressure is performed, there is a problem that the wiping surface is easily contaminated or dust is generated due to dropping of a single fiber.
JP 2005-245752 A JP 2004-8501 A

Weaving and knitting using yarns obtained by known compound spinning methods such as sea-island type, multi-layer bonding type, multi-layer radiation type, etc. to give the wiping cloth high water absorption, wiping property, and dust collection property by capillary action After elution, swelling and peeling using chemicals such as organic solvents such as benzyl alcohol and toluene, acids such as formic acid and oxalic acid, alkali metals such as sodium hydroxide and potassium hydroxide, and hydroxides of alkaline earth metals A number of methods for producing ultra-fine multifilament yarns by the above methods have been described and marketed. (For example, see Patent Documents 3 to 5.)
JP 2006-336118 A JP 2004-131863 A Japanese Patent Laid-Open No. 2001-20150

  These methods make it possible to obtain ultra-fine fibers at a low cost, but not only have a large waste liquid load in the manufacturing process and have a large impact on the environment, but also include drug components and polymer components that could not be completely removed (dimer (Including substances obtained in the decomposition process, such as water and trimmer) can remain on the wiping cloth, causing dust generation and contamination of the wiping surface. Further, the chemical treatment causes a considerable embrittlement of the fiber, and there are concerns about physical properties such as fluff falling off due to single yarn cutting and tearing strength and tensile strength of the wiping cloth itself.

Moreover, while giving high water absorption and dust collection property by capillary action, a method of using a Mole yarn or a napped tissue is described as a method of dispersing the pressure at the time of wiping and suppressing micro scratches such as scratches (for example, And Patent Documents 6 and 7.). However, in this method, the flower yarn constituting the molding yarn falls off, and the raised fiber falls off, so that it is easy to generate dust and is difficult to use for clean room use.
JP 2004-308025 A JP 2002-371451 A

In view of the problems as described above, the present invention has been completed through extensive research. The object of the present invention is to achieve excellent water absorption and wiping, and to moderately disperse the pressure that tends to concentrate on a limited part in the wiping operation by having an appropriate bulkiness and aim to suppress small scratches such as scratches. At the same time, it is an object to provide a wiping cloth that has excellent dust collection and low self-dusting.

The present invention has the following configuration.
1. A synthetic fiber multifilament A having a single yarn fineness of 0.1 dtex to 0.7 dtex and a synthetic fiber multifilament B having a single yarn fineness of 1.0 dtex to 3.0 dtex is combined. A wiping cloth which is woven and knitted using at least a part of a yarn and satisfies the following conditions.
Specific volume (reciprocal of density): 2.45 × 10 ⁻² cm ³ / g or more and 2.65 × 10 ⁻² cm ³ / g or less The synthetic fiber multifilament A and / or the synthetic fiber multifilament B is made of a polyester-based synthetic fiber multifilament yarn, and the boiling water shrinkage SHW of the synthetic fiber multifilament B is 30.0% or more and 70.0% or less. The wiping cloth according to the first aspect, wherein the composition ratio of the synthetic fiber multifilaments A and B is in the range of 85:15 to 55:45 as a weight ratio of A: B.
3. End face treatment is performed by any of high-frequency treatment, ultrasonic treatment, or laser treatment. Separation with a particle size of 0.3 μmφ or more and 25 μmφ or less is possible in the dust generation evaluation according to the method described in JIS B9923. The total number of fine particles is 100 / 2.83 × 10 ⁻² m ³ or less.
4). Any of the above first to third, wherein the warp direction and the weft direction, the wales direction and the course direction of the knitted fabric are 80 mm or more and 200 mm or less in the water absorption test according to the method described in JIS L1907 (Byreck method). Wiping cloth as described in

  According to the present invention, it is excellent in wiping / removing property of oily dirt and aqueous dirt, and dust collecting power, and it does not cause minute scratches such as scratches on the wiping surface by appropriately dispersing the pressure during wiping. Further, since self-dusting is extremely small, a wiping cloth suitable for use in a clean room is provided.

The present invention will be described in detail below.
The wiping cloth of the present invention is a synthetic fiber multifilament A having a single yarn fineness of 0.1 dtex or more and 0.7 dtex or less, and a synthetic fiber having a single yarn fineness of 1.0 dtex or more and 3.0 dtex or less. Weaving and knitting is performed using at least a part of the yarn formed by combining the multifilaments B. Of course, it does not matter if the yarn constituting the woven or knitted fabric is constituted by 100% of the above-mentioned combination of yarns.

  Synthetic fiber multifilament A and synthetic fiber multifilament B are obtained by melt spinning, wet spinning, dry spinning, and other known spinning methods from polymers having spinnability. Polyamide, polyester, polyolefin, poly Known polymers such as acrylonitrile can be mentioned. In particular, the synthetic fiber filament A is preferably subjected to false twist crimping, and is preferably a thermoplastic polymer. Synthetic fiber multifilaments A and B may be the same polymer, or one of them may be a copolymer of the same polymer. Also included are combinations of different polymers. In view of handling and cost, it is more preferable to employ a polyester-based synthetic fiber multifilament for both the synthetic fiber multifilaments A and B.

  The synthetic fiber multifilament A is preferably a false twist crimped one. By applying false twist crimping, cross-sectional deformation occurs, and a cross-section with sharp edges is obtained, as well as giving moderate bulkiness to form a random crimp shape between the yarn longitudinal direction and the single yarn filaments. I can do it. The fine crimp and bulkiness improve the dust collection efficiency, and the dust trapping property is also good. Furthermore, the pressure can be dispersed appropriately, and an effect can be expected to prevent small scratches such as scratches during wiping. The false twist crimping can be performed using a known drawing false twisting machine such as a friction disk type, a belt type, or a pin type. The false twisting process may be either a non-set type 1 heater type or a set type 2 heater type, but it is more preferable to adopt a non-set type 1 heater type in order to give a bulky feeling due to crimping. Further, at the time of winding in the false twist crimping process, an entanglement process (interlace) by a high-pressure air flow may be performed as necessary.

  The single filament fineness of the multifilament A is not less than 0.1 dtex and not more than 0.7 dtex, preferably not less than 0.2 dtex and not more than 0.5 dtex, and more preferably obtained by direct melt spinning. Many ultrafine fibers are produced by the composite spinning method, but there are problems of waste liquid due to chemical treatment during split ultrafine processing, fiber embrittlement, self-dusting problems due to residual polymer components, etc. This is because of concern. Ultra-fine multifilaments having a single yarn fineness of less than 0.1 dtex are less preferred because they are technical levels that are difficult to produce by direct melt spinning and are difficult to achieve in terms of cost. Further, a fineness exceeding 0.7 dtex is not preferable because the wiping property of various types of dirt is poor.

  The total fineness and the number of constituent single yarns of the multifilament A are not particularly limited, but for industrial cleaning cloths and wiping cloths, the total fineness is 40 to 330 dtex, more preferably 50 to 220 dtex. Is exemplified. The number of constituent single yarns is 100 or more and 3300 or less, more preferably 200 or more and 2200 or less, and can be appropriately set according to each combination and purpose.

  The single yarn fineness of the synthetic fiber multifilament B is preferably 1.0 dtex or more and 3.0 dtex or less. If the single yarn fineness is less than 1.0 decitex, the woven or knitted fabric cannot be given a moderate waist feeling, and wrinkles are generated during wiping. It is not preferable because it is easy to scratch. In addition, in the range exceeding 3.0 decitex, it is possible to give the knitted fabric an excellent feeling of low back, but it is difficult to bend and deform, and it is not preferable, and the wiping removal property of fine irregularities and curved surfaces is unsatisfactory. Since it is easy to become, it is not so preferable.

  The total fineness and the number of constituent single yarns of the multifilament B are not particularly limited, but the total fineness is in the range of 20 dtex to 110 dtex, more preferably 30 dtex to 84 dtex. The number of constituent single yarns is 10 or more and 110 or less, more preferably 20 or more and 75 or less, and can be appropriately set depending on the combination, the combination with the synthetic fiber multifilament A, and the purpose.

  The wiping cloth of the present invention is a synthetic fiber multifilament A having a single yarn fineness of not less than 0.1 dtex and not more than 0.7 dtex, and a synthetic fiber multifilament having a single yarn fineness of not less than 1.0 dtex and not more than 3.0 dtex. The yarn formed by combining the filaments B is woven and knitted using at least a part of the yarn, but using the yarn for at least a part of course includes the whole of the yarn. It is particularly preferable that the surface constituting the wiping surface is constituted only by the yarn. The composite method of synthetic fiber multifilament A and synthetic fiber multifilament B is not only entanglement treatment (interlace) by high-pressure air flow, but also high-pressure air disturbance treatment (Tasuran processing Dupont) (Trade name), etc., can be carried out using a publicly known method.

The specific volume (reciprocal of the density) of the wiping cloth of the present invention is 2.45 × 10 ⁻² cm ³ / g or more and 2.65 × 10 ⁻² cm ³ in view of the pressure dispersion effect per unit area of the wiping surface. / G or less, more preferably 2.50 × 10 ⁻² cm ³ / g or more and 2.60 × 10 ⁻² cm ³ / g or less. If the non-volume is less than 2.45 × 10 ⁻² cm ³ / g, the amount of deformation due to pressing tends to be small, and the scratch (small scratch) formation frequency tends to increase. On the other hand, the wiping effect remains small in a range significantly exceeding 2.60 × 10 ⁻² cm ³ / g, and it is not preferable as a wiping cloth.

  The boiling water shrinkage ratio SHW of the synthetic fiber multifilament B is preferably 30.0% or more and 70.0% or less, and more preferably 40.0% or more and 65% or less. If the boiling water shrinkage ratio SHW is less than 30.0%, it is difficult to give the woven or knitted fabric an appropriate feeling of swelling, and the specific volume tends to be small, so that scratches (small scratches) are easily generated in the wiping operation. It is not preferable. In addition, if it exceeds 70.0%, the cost will be high and the bulge of the knitted or knitted fabric will become too large, and the wiping effect will be reduced, which is not preferable.

As a method of giving a high shrinkage ratio of the synthetic fiber multifilament B, the polymer to be used is exemplified as polyester. For example, an appropriate amount of ethylene oxide adduct of isophthalic acid, 5-sodium sulfoisophthalic acid, bisphenol A or bisphenol F, etc. A method using a polymerized polyethylene terephthalate, a method of applying a stretching heat setting of a polyester filament in a low temperature region below the glass transition temperature of the polymer, or a known and public method such as a composite method thereof can be used. The intrinsic viscosity [η] of the raw material polymer in the case where the polymer to be used is polyester is not particularly limited, but it is 0 in view of hydrolysis due to heating during spinning, the strength of the woven or knitted fabric, and prevention of self-dusting. A range of .45 cm ³ / g or more and 0.80 cm ³ / g or less, preferably 0.50 cm ³ / g or more and 0.70 cm ³ / g or less is preferably exemplified.

  The composition ratio of the synthetic fiber multifilaments A and B is preferably 85:15 to 55:45, more preferably 80:20 to 60:40 as the weight ratio of A: B. If the composition ratio of the synthetic fiber multifilament A is increased, the ultrafine multifilaments are effectively arranged along the wiping surface during the wiping operation, the cleaning effect by the ultrafine sharp edge, the bulkiness of the false twisted yarn It is possible to provide a dust and dirt trapping effect. However, since the ratio of the synthetic fiber multifilament B that gives a feeling of swelling and elasticity is reduced accordingly, there is a risk of occurrence of scratches (micro-scratches) due to an increase in pressing force, and deformation such as elongation and settling is likely to occur. And the trapping effect of dirt is easy to reduce, which is not preferable.

  The cross-sectional shape of the synthetic fiber multifilaments A and B used for the wiping cloth of the present invention is not particularly limited, and known ones such as a round cross section, a triangular cross section, a multi-leaf cross section, a flat cross section, a solid cross section, a hollow cross section, etc. It can be adopted. If necessary, it may contain an appropriate amount of titanium dioxide, barium sulfate, silicon dioxide, etc. as a third component, and may contain UV absorbers, antioxidants, and other stabilizers as necessary. Good.

  The wiping cloth of the present invention is obtained by processing the end face by any one of high-frequency processing, ultrasonic processing, or laser processing, and is subjected to sewing processing using fusion cutting such as heat cut, piping or sewing threads by various stitches. It is not something to apply. As the end face treatment method, any one of a method using an ultrasonic cut (ultrasonic cut), a high-frequency welder, or a method using a laser such as an infrared ray can be used. Treatment using ultrasonic cutting or high-frequency welder is preferable, and it is possible to keep the melting amount of the end face to a minimum. It has the effect of preventing itself from falling off.

In the wiping cloth of the present invention, the total number of separable particles having a particle size of 0.3 μmφ to 25 μmφ in the dust generation evaluation according to the method described in JIS B9923 is 100 / 2.83 × 10 ⁻² m ³ or less. Further, it is desirable that the numerical value is as close as possible to 0 / 2.83 × 10 ⁻² m ³ . In a range where the number of particles significantly exceeds 100 / 2.83 × 10 ⁻² m ³ , the amount of self-generated dust becomes too large, and in use in a clean room, the possibility of contaminating the product with generated dust is preferable. Absent. The sample (wiping cloth) to be evaluated for dust generation is evaluated after industrial pure water cleaning (clean washing) in advance by a linen supplier whose cleanliness can be managed to satisfy ISO class 5 (class 100). It is preferable to use for.

  Further, in the water absorption test according to the method described in JIS L1907 (Byreck method), the warp direction and the weft direction in the case of the woven fabric, the wale direction of the knitted fabric, and the course direction are preferably 80 mm or more and 200 mm or less. If it is less than 80 mm, the removal performance of water-based dirt and the moisture removal performance of the wiping surface are small, and the range that gives a high water absorption effect exceeding 200 mm is also high in cost, and is extremely overquality for the intended use of the present invention. Become. In order to further improve the water absorption performance, the hydrophilic processing agent or the water absorption / SR processing agent may be treated using a known method such as a bath exhaustion method, a pad dry method, or a pad dry cure method. In view of cost and effect, the method by simultaneous exhaustion is preferred. Examples of the water absorption / SR processing agent include SOFTNER SR, SR-1000, and SR-1800 manufactured by Takamatsu Yushi Co., Ltd. However, in the case of applying an excessive amount, there is a problem of contamination on the wiping surface.

  The wiping cloth of the present invention is made of a woven or knitted fabric, and it is desirable that the wiping cloth has a high density, a high density, and a high bulk. In the case of a woven fabric, a double structure such as warp double weave, weft double weave, warp double weave, or multiple structure is preferably employed. Multiple tissues are preferably employed. Of course, the structure is not limited to both woven and knitted fabrics, and a known structure can be adopted, and the apparatus can be woven or knitted using a known apparatus.

  When the raw machine is scoured and dyed, it can be carried out according to a known method. Scouring can be carried out for relaxation, and may be subjected to alkali weight reduction treatment as necessary. For the scouring, a well-known type such as a high-pressure liquid scouring machine can be used in addition to a normal pressure spreading type such as an open soaper, and these can be combined as necessary. The dyeing process is also known by a continuous dyeing method such as a cold batch by the pad method, by a dyeing method such as a jigger dyeing machine, a wins dyeing machine, a paddle dyeing machine, a beam dyeing machine, a liquid dyeing machine, or an airflow dyeing machine. Any method may be used. If necessary, antistatic agent (antistatic agent), soft finish, water-absorbing agent, antifungal agent, antibacterial and deodorant by simultaneous dyeing exhaustion method, pad dry method, pad steam method, pad dry cure method, etc. Moreover, functional drug treatment such as antibacterial agents is also possible. Of course, it is desirable to avoid application of an excessive amount in order to prevent contamination due to the remaining of the drug on the wiping surface, and it is desirable to remove the excessive drug by soaping or the like.

  Hereinafter, the present invention will be described in more detail with reference to examples. Needless to say, the present invention is not limited to the following examples.

(Intrinsic viscosity) A polymer (polymer) was dissolved in a mixed solvent consisting of 75% by weight of parachlorophenol and 25% by weight of tetrachloroethane in the mixed solvent at room temperature, and then subjected to an Ubbelohde viscosity under a constant temperature condition of 25 ° C. The viscosity number ηsp / c was determined by a meter, ηsp / c was plotted against the concentration c (three-point dilution method), and the intrinsic viscosity [η] was determined by extrapolating ηsp / c from c → 0.

(Boiling water shrinkage rate) Using a lap reel (cassette removing machine) with a frame circumference of 1.125 m, the sample was rolled back at a speed of 120 times / min with an initial load of 0.1 cN / dtex, and the number of rolling was 20 times. A casserole is prepared, and a lash length L1 (mm) is measured by applying a weight 40 times the initial load. Next, remove the weight and immerse it in boiling water (100 ° C.) for 30 minutes in such a way that the shrinkage is not hindered, remove it, wipe off the water with blotting paper or cotton cloth, and air dry in a horizontal state. After air-drying, the weight L2 (mm) is measured by applying a weight again. Substituting the above L1 and L2 into Equation 1 below, the boiling water shrinkage (SHW) is measured. In addition, let the average value of the test frequency 5 times be the measured value.
(Formula 1) SHW = (L1-L2) / L1 × 100 (%)

(Dust generation) A set of five test pieces (21 cm x 21 cm) that have been subjected to industrial pure water cleaning (clean washing) in advance by a linen supplier whose cleanliness can be managed to satisfy ISO class 5 (class 100) In a clean room (cleanliness: ISO class 5 (class 100), tumbling dust generation tester (CW-HDT-102 model, manufactured by Akachi Seisakusho), and drum rotation speed according to the method described in JIS B9923. Separation using a light dispersion type automatic particle counter (Met One A2400B manufactured by Hach Ultra Analytics) under the conditions of 30 revolutions / minute, flow rate of 0.0102 m ³ / second, and suction amount of 2.83 × 10 ⁻² m ³ / minute possible particle number was determined particle size 0.3μmφ more 25μmφ less number of particles (the number /2.83×10 ^-2 m ^3). experiments 1 minute One five times consecutively measured, and the average value of the remaining measurements excluding the maximum and minimum values and dust generation number.

(Water Absorption) In accordance with the method described in JIS L1907 (Birec method), sample pieces were cut out in the warp direction and weft direction in the case of woven fabric and in the wale direction and course direction in the case of knitted fabric, respectively, and used for measurement. Water absorption (mm) was determined by taking an average value of 5 measurements.

(Specific volume) It calculates | requires from the fabric weight (g / m < ² >) and thickness (m) of a woven / knitted fabric. The basis weight was cut into a 20 cm × 20 cm square, weighed (unit: g) with a precision balance, and multiplied by 25 to obtain a basis weight (g / m ² ). Five points of the sample were cut out and the measured average value was used as the basis weight (g / m ² ).
The thickness was measured at five locations using a dial thickness gauge Peacock-H type manufactured by Ozaki Mfg. Co., Ltd., and the average value was taken as the thickness (m).

(Abrasion strength during drying) According to the method described in JIS L1018 (Martindale method), a standard cloth was used as the friction cloth, and the fabric damage when the abrasion operation was performed 10,000 times under the condition of a pressure load of 9 kPa was visually evaluated. .

(Wear Abrasion Strength) After a friction cloth (using a standard cloth) and a sample were immersed in distilled water for 24 hours, the friction cloth and the sample were each prepared in a wet state of 50% by weight with respect to the dry weight. According to the method described in L1018 (Martindale type method), the fabric damage when the wear operation was performed 10,000 times under the condition of a pressing load of 9 kPa was visually evaluated.

(Dirt wiping property) 0.2 g of liquid paraffin (reagent grade 1 manufactured by Wako Pure Chemical Industries, Ltd.) is uniformly applied to a ² cm × 2 cm square (4 cm ² ) center of a JIS A4 size acrylic plate with a smooth surface using a squeegee. Applied. A wiping cloth sample was placed on a cylindrical weight having a weight of 1000 g and a diameter of 45 mm, and the wiping operation was performed by reciprocating once from one short side of the acrylic plate to the other short side, that is, in the A4 vertical direction. The acrylic board after the wiping operation is visually judged by 5 experts, and 5 grades are evaluated, with 5 grades where the paraffin stains remain extremely large and 5 grades where almost all are removed. Was used as an evaluation result of dirt wiping property.

(Scratch evaluation) The acrylic plate after the dirt wiping evaluation was installed at an inclination angle of 30 °, and a light source (fluorescent lamp FL40S N-EDL-NU type manufactured by Mitsubishi Electric OSRAM Co., Ltd.) was irradiated from the vertical upper side to scratch Was visually evaluated. Evaluation is based on five levels of visual judgment by 10 experts. Grade 1 = good compared to comparative product, grade 2 = somewhat good compared to comparative product, grade 3 = comparable product, grade 4 = somewhat poor compared to comparative product, grade 5 = comparative product Rating was evaluated as a poor contrast. As a comparative sample, a cotton wrench No. 3 was used (acrylic plate) which was wiped according to the above-described method for evaluating dirt wiping. The average value of the judgment of 5 people was taken as the scratch evaluation result.

Example 1
Using polyethylene terephthalate semidal pellets having an intrinsic viscosity [η] of 0.63 cm ³ / g and a titanium dioxide content of 0.2% (W / W), spinning using a known melt spinning method (spinning) A normal drawn yarn A ′ having a 78 dtex 216 filament round cross section (single fiber fineness of 0.36 dtex) was obtained. Next, the normal drawn yarn A ′ is subjected to a first heater temperature of 210 ° C. and a false twisting number of 3500 times / m (Z twisting → S untwisting) using a magnetic spindle type stretching false twisting device LS-6 manufactured by Mitsubishi Heavy Industries, Ltd. A false twisted yarn (one heater false twisted yarn) was obtained under the conditions of an overfeed rate of 1.5% to the first heater region (twisting region) and a winding speed of 100 m / min. (The false twisted yarn is hereinafter referred to as multifilament A.)

Polyester copolymer bright pellets obtained by copolymerizing 90 mol% of terephthalic acid component and 10 mol% of isophthalic acid component (inherent viscosity [η] is 0.55 cm ³ / g, titanium dioxide content 0.02% (W / W)) using a known melt spinning method, a normal drawn yarn of 41 dtex 24 filament triangular cross section (single fiber fineness 1.71 dtex) was obtained by direct drawing (spin draw). The normal drawn yarn had a boiling water shrinkage (SHW) of 60.0%. (The normal drawn yarn is hereinafter referred to as multifilament B.)

  Subsequently, the multifilament A and the multifilament B were each subjected to high pressure air entanglement treatment (interlace) at the same rate supply with an oversupply of 0.5% to obtain a mixed fiber composite yarn of 119 dtex 240 filaments. A knitted fabric obtained by knitting a smooth fabric using a double knit circular knitting machine V-4AL (caliber 33 inches, 28 gauge, 64 calibers) manufactured by Fukuhara Seiki Seisakusho Co., Ltd. using 100% of the mixed fiber composite yarn. After scouring with an open soaper with a bath temperature of 90 ° C., dyeing with a disperse dye was performed using a high-pressure liquid dyeing machine. The treatment method is as follows: dyeing temperature 130 ° C., bath ratio 1:15, dye solution pH = 5.3, disperse dye X% owf. The durability water absorption / SR processing agent SOFTNER SR manufactured by Takamatsu Yushi Co., Ltd. is 2.5% owf. Was simultaneously formulated (simultaneous dyeing exhaustion formulation). After dyeing, it was dehydrated and dried, and the processed fabric was finished using a heat setter with a dry heat of 160 ° C.

  The obtained processed fabric was subjected to ultrasonic cut (ultrasonic cut) on a 21 cm × 21 cm square to obtain a wiping cloth. Table 1 summarizes the general characteristics of the obtained wiping cloth. The obtained wiping cloth had an appropriate feeling of swelling and soft touch, and was excellent in dirt wiping and trapping properties. Moreover, self-dusting is extremely small, and it can sufficiently cope with working environments that require ultra-clean conditions such as semiconductor manufacturing, precision equipment manufacturing, and assembly. Furthermore, due to the large specific volume (bulky) effect, the pressure is moderately dispersed and a scratch suppressing effect can be expected.

(Example 2)
Using polyethylene terephthalate semidal pellets having an intrinsic viscosity [η] of 0.63 cm ³ / g and a titanium dioxide content of 0.2% (W / W), spinning using a known melt spinning method (spinning) A normal drawn yarn A 'having a round cross section of 84 dtex 360 filament (single fiber fineness 0.23 dtex) was obtained. Next, the normal drawn yarn A ′ is subjected to a first heater temperature of 210 ° C. and a false twisting number of 3200 times / m (Z twisting → S untwisting) using a magnet spindle type stretching false twisting device LS-6 manufactured by Mitsubishi Heavy Industries, Ltd. A false twisted yarn (one heater false twisted yarn) was obtained under the conditions of an overfeed rate of 2.0% to the first heater region (twisting region) and a winding speed of 100 m / min. (The false twisted yarn is hereinafter referred to as multifilament A.)

Polyester copolymer bright pellets obtained by copolymerizing 90 mol% of terephthalic acid component and 10 mol% of isophthalic acid component (inherent viscosity [η] is 0.55 cm ³ / g, titanium dioxide content 0.02% (W / W)) was obtained by using a known melt spinning method to obtain a normal drawn yarn having a 41 dtex 18 filament triangular cross section (single fiber fineness 2.28 dtex) by direct drawing (spin draw). The normal water draw yarn had a boiling water shrinkage (SHW) of 55.0%. (The normal drawn yarn is hereinafter referred to as multifilament B.)

  Subsequently, multifilament A and multifilament B were each subjected to high pressure air entanglement treatment (interlace) at an equal supply rate of 0.5% oversupply to obtain a mixed fiber composite yarn of 125 dtex 378 filament. A knitted fabric obtained by knitting a smooth fabric using a double knit circular knitting machine V-4AL (caliber 33 inches, 28 gauge, 64 calibers) manufactured by Fukuhara Seiki Seisakusho Co., Ltd. using 100% of the mixed fiber composite yarn. In the same manner as in Example 1, dyeing (with water absorption and SR processing agent applied simultaneously) was performed to obtain a processed dough.

  The obtained processed fabric was subjected to ultrasonic cut (ultrasonic cut) on a 21 cm × 21 cm square to obtain a wiping cloth. Table 1 summarizes the general characteristics of the obtained wiping cloth. The obtained wiping cloth had an appropriate feeling of swelling and soft touch, and was excellent in dirt wiping and trapping properties. Moreover, self-dusting is extremely small, and it can sufficiently cope with working environments that require ultra-clean conditions such as semiconductor manufacturing, precision equipment manufacturing, and assembly. Furthermore, due to the large specific volume (bulky) effect, the pressure is moderately dispersed and a scratch suppressing effect can be expected.

(Example 3)
Using polyethylene terephthalate semidal pellets having an intrinsic viscosity [η] of 0.63 cm ³ / g and a titanium dioxide content of 0.2% (W / W), spinning using a known melt spinning method (spinning) A normal drawn yarn A ′ having a round cross section of 84 dtex 144 filament (single fiber fineness 0.58 dtex) was obtained. Next, the normal drawn yarn A ′ is subjected to a first heater temperature of 210 ° C. and a false twisting number of 3300 times / m (Z twisting → S untwisting) using a magnet spindle type stretching false twisting device LS-6 manufactured by Mitsubishi Heavy Industries, Ltd. A false twisted yarn (one heater false twisted yarn) was obtained under the conditions of an overfeed rate of 2.0% to the first heater region (twisting region) and a winding speed of 100 m / min. Next, two false twisted yarns obtained were aligned in an off-line process, subjected to high-pressure air entanglement treatment, and wound as a false twisted yarn of 168 dtex 288 filament. (The false twisted yarn is hereinafter referred to as multifilament A.)

Polyester copolymer bright pellets obtained by copolymerizing 90 mol% of terephthalic acid component and 10 mol% of isophthalic acid component (inherent viscosity [η] is 0.55 cm ³ / g, titanium dioxide content 0.02% (W / W)) was obtained by using a known melt spinning method to obtain a normal drawn yarn having a 41 dtex 18 filament triangular cross section (single fiber fineness 2.28 dtex) by direct drawing (spin draw). The normal water draw yarn had a boiling water shrinkage (SHW) of 55.0%. (The normal drawn yarn is hereinafter referred to as multifilament B.)

The obtained multifilaments A and B are aligned at the same rate by using a DTH type Ishikawa Seisakusho Co., Ltd. twisted yarn, twisted by applying 300 twists / m in the Z twist direction, and 209 decitex 306 filaments. A twisted composite yarn was obtained. The composite yarn was used as the warp, and the multifilament A was used as the weft, and was woven into a double satin structure (combined front and back structure of seven sheets of satin) using a Beatmax ISL2001 type rapier room manufactured by Ishikawa Seisakusho. The density on the weave was warp 156 / 2.54 cm and weft 61 / 2.54 cm.

  Using the dough, scouring was performed using a spread-type relaxer (Softener manufactured by Nissen) with a pre-bath of 50 ° C. and a main bath of 90 ° C. and a liquid scourer with a maximum bath temperature of 110 ° C., and a surface temperature of 100 ° C. It dried with the cylinder dryer which was made, and the preliminary | backup set by the heat setter with a dry heat of 175 degreeC was implemented. Subsequently, it dye | stained with the disperse dye using the high-pressure liquid-flow dyeing machine. The treatment method is as follows: dyeing temperature 130 ° C., bath ratio 1:15, dye solution pH = 5.3, disperse dye X% owf. The durability water absorption / SR processing agent SOFTNER SR manufactured by Takamatsu Yushi Co., Ltd. is 2.5% owf. Was simultaneously formulated (simultaneous dyeing exhaustion formulation). After dyeing, it was dehydrated and dried, and the processed fabric was finished using a heat setter with a dry heat of 160 ° C. The finished density of the obtained processed fabric was warp 170 / 2.54 cm and weft 95 / 2.54 cm.

  The obtained processed fabric was subjected to ultrasonic cut (ultrasonic cut) on a 21 cm × 21 cm square to obtain a wiping cloth. Table 1 summarizes the general characteristics of the obtained wiping cloth. The obtained wiping cloth had an appropriate feeling of swelling and soft touch, and was excellent in dirt wiping and trapping properties. Moreover, self-dusting is extremely small, and it can sufficiently cope with working environments that require ultra-clean conditions such as semiconductor manufacturing, precision equipment manufacturing, and assembly. Furthermore, due to the large specific volume (bulky) effect, the pressure is moderately dispersed and a scratch suppressing effect can be expected.

(Comparative Example 1)
Using polyethylene terephthalate semidal pellets having an intrinsic viscosity [η] of 0.63 cm ³ / g and a titanium dioxide content of 0.2% (W / W), spinning using a known melt spinning method (spinning) A normal drawn yarn A ′ having a 78 dtex 72 filament round cross section (single fiber fineness 1.08 dtex) was obtained. Next, the normal drawn yarn A ′ is subjected to a first heater temperature of 210 ° C. and a false twisting number of 3500 times / m (Z twisting → S untwisting) using a magnetic spindle type stretching false twisting device LS-6 manufactured by Mitsubishi Heavy Industries, Ltd. A false twisted yarn (one heater false twisted yarn) was obtained under the conditions of an overfeed rate of 1.5% to the first heater region (twisting region) and a winding speed of 100 m / min. Except for using the false twisted yarn as the multifilament A, dyeing was performed in the same manner as in Example 1 to obtain a wiping cloth. Table 1 summarizes the general characteristics of the obtained wiping cloth. Although the obtained wiping cloth had an appropriate feeling of swelling and soft touch, the wiping property of dirt was not satisfactory. Further, the single yarn fineness was large, and scratches (small scratches) were confirmed on the wiping surface, which was not preferable as the wiping cloth intended by the present invention.

(Comparative Example 2)
As in Example 1, a polyethylene terephthalate semidal pellet having an intrinsic viscosity [η] of 0.63 cm ³ / g and a titanium dioxide content of 0.2% (W / W) was used, and a known melt spinning method was used. Thus, a normal drawn yarn A ′ having a 78 dtex 216 filament round cross section (single fiber fineness 0.36 dtex) by direct spinning (spin draw) was obtained. A dyeing process was performed in the same manner as in Example 1 except that the normal drawn yarn A ′ was used in combination with the multifilament B in a flat yarn (raw filament) state without false twisting to obtain a wiping cloth. . Table 1 summarizes the general characteristics of the obtained wiping cloth. The obtained wiping cloth was inferior to the Examples in terms of swelling and soft touch, and was slightly paper-like. Further, the cross section of the ultra-fine multifilament was a round cross section, and the wiping property of dirt was poor, and the trapping performance was not sufficient due to the use of flat yarn (raw filament). Moreover, since the bulkiness is insufficient, the pressure during wiping cannot be dispersed appropriately, and scratches (small scratches) are confirmed on the wiping surface, which is preferable as the wiping cloth intended by the present invention. I didn't.

(Comparative Example 3)
Using polyethylene terephthalate semidal pellets having an intrinsic viscosity [η] of 0.63 cm ³ / g and a titanium dioxide content of 0.2% (W / W), spinning using a known melt spinning method (spinning) A normal drawn yarn having a 41 dtex 24-filament triangular cross section (single fiber fineness of 1.71 dtex) was obtained. The normally drawn yarn had a boiling water shrinkage (SHW) of 15.0%. (The normal drawn yarn is hereinafter referred to as multifilament B.) Dyeing was performed in the same manner as in Example 1 except that the multifilament B was used to obtain a wiping cloth. Table 1 summarizes the general characteristics of the obtained wiping cloth. The obtained wiping cloth was very inferior to the Examples in terms of swelling and soft touch, and finished to be paper-like. Due to the lack of bulkiness, the pressure during wiping cannot be properly dispersed, and scratches (small scratches) are confirmed on the wiping surface, which is preferable as the wiping cloth intended by the present invention. did not become.

Fiber cross-sectional photograph of the wine ping cloth obtained in Example 1 Surface photograph of the wiping cloth obtained in Example 1 Course direction (lateral direction) cross-sectional photograph of the wiping cloth obtained in Example 1

Claims (4)

A synthetic fiber multifilament A having a single yarn fineness of 0.1 dtex to 0.7 dtex and a synthetic fiber multifilament B having a single yarn fineness of 1.0 dtex to 3.0 dtex is combined. A wiping cloth which is woven and knitted using at least a part of a yarn and satisfies the following conditions.
Specific volume (reciprocal of density); 2.45 × 10 ⁻² cm ³ / g or more and 2.65 × 10 ⁻² cm ³ / g or less   The synthetic fiber multifilament A and / or the synthetic fiber multifilament B is made of a polyester-based synthetic fiber multifilament yarn, and the boiling water shrinkage SHW of the synthetic fiber multifilament B is 30.0% or more and 70.0% or less. The wiping cloth according to claim 1, wherein the composition ratio of the synthetic fiber multifilaments A and B is in the range of 85:15 to 55:45 as a weight ratio of A: B. End face treatment is performed by any of high-frequency treatment, ultrasonic treatment, or laser treatment. Separation with a particle size of 0.3 μmφ or more and 25 μmφ or less is possible in the dust generation evaluation according to the method described in JIS B9923. ^3. The wiping cloth according to claim 1, wherein the total number of fine particles is 100 / 2.83 × 10 ⁻² m ³ or less. Any of the warp direction and the weft direction in the case of the woven fabric, the wale direction of the knitted fabric, and the course direction in the water absorption test according to the method (Birec method) described in JIS L1907 is 80 mm or more and 200 mm or less. The wiping cloth described.