JP4598600B2 - Wiping cloth - Google Patents

Description

  The present invention relates to a wiping cloth having a high water absorption, a small dust generation, and a soft texture excellent in wiping.

  Conventionally, wiping cloths have been used for applications such as cleaning cloths, eyeglasses and lens wiping. And many of them have used natural fibers such as cotton fibers as fiber materials with good water absorption, and ultrafine fibers that are expected to increase the adsorption power by increasing the fiber surface area in the fabric. Today, wiping cloth is widely deployed in industrial fields such as IC and semiconductor manufacturing factories and clean rooms. The wiping cloth for industrial use is required not to generate dust as well as the wiping ability of conventional oil, water, etc., and the dust trapping power.

However, as described in, for example, Patent Document 1 (Japanese Patent Application Laid-Open No. 61-228821), a wiping cloth in which a large amount of natural fiber is located on the surface of the fabric causes fluff to fall on the surface of the object to be wiped. There is a problem of dust generation. Further, as described in, for example, Patent Document 2 (Japanese Patent Application Laid-Open No. 63-211364), a high density mainly composed of ultrafine yarns of 0.2 dtex or less and yarns of 0.5 to 10 dtex fibers. The entangled knitted fabric has a problem in that extra fine yarn is generated due to the surface coming out of the wiping cloth.
Japanese Patent Laid-Open No. 61-228821 JP 63-2111364 A

  An object of the present invention is to overcome the above-mentioned problems and to provide a wiping cloth having high wiping properties such as oil and water, high dust capturing power, and low dust generation that can be used for industrial applications.

  In the present invention, the single filament fineness is 0.0001 dtex or more and less than 0.1 dtex, the single filament fineness is 0.1 to 10 dtex, and the boiling water shrinkage is 10 to 60% of the multifilament A. A wiping cloth characterized by using a mixed yarn made of multifilament B.

  ADVANTAGE OF THE INVENTION According to this invention, the wiping cloth with little dust generation property which can be used also for an industrial use is provided with high wiping off property, such as oil and water, and dust collection power.

The present invention is described in detail below.
Conventionally, many wiping cloths have used ultrafine fibers that are expected to increase the adsorptive power by increasing the fiber surface area in the fabric. The characteristics of the wiping cloth using ultrafine fibers are that water absorption and oil absorption increase due to the capillary phenomenon of the fiber gap, and that the sharp multi-shaving effect and inner trap effect peculiar to ultrafine fibers can be expected. On the other hand, since the fibers are thin, there is a problem that single yarn breaks and dust is generated.

  The present invention is based on the core-sheath type two-layer structure yarn in which the multifilament A having a large boiling water shrinkage is located in the core and the multifilament B is located in the sheath for the purpose of taking advantage of the features of the ultrafine fibers and preventing dust generation. It is characterized by a wiping cloth. After the wiped dirt is absorbed between the fibers of the sheath, the dirt is pushed up from the sheath to the core by the sharp multi-shaving effect, and the water absorption is enhanced by the capillary action and inner trap effect of the ultrafine fibers in the core. Increases wiping performance. INDUSTRIAL APPLICABILITY The present invention can provide a wiping cloth that has high wiping properties for oil, water, etc., has excellent dust capturing power, and can be used for industrial applications with little dust generation.

  Here, the sharp multi-shaving effect in the present invention is an effect utilizing a large surface area and a large number of fibers in a certain area. When the number of times of fiber contact with the object is much increased, the ultrafine fibers scrape the oil film and push it up to the upper superfine fiber group. When wiping with a thick fiber, the fat accumulated in the entire fiber due to the movement of the fiber is caught again under the fiber, and the removal function is inferior. The inner trap effect is an effect using a space (micro pocket) between ultrafine fibers. When the object is wiped off, the fiber group is pressed with the finger and the fat is sucked in. However, when the pressed state is released, the fat moves to the inside if the fiber density inside the fabric is high. The surface after movement has less fat and enhances the next wiping effect.

  The single filament fineness of the multifilament A located in the inner layer portion of the wiping cloth of the present invention is 0.0001 dtex or more and less than 0.1 dtex, preferably in the range of 0.001 to 0.01 dtex. More specifically, the range of 0.004 to 0.009 dtex is more preferable. If the single yarn fineness is 0.1 dtex or more, the performance of the wiping cloth such as water absorption and wiping properties will be hindered. On the other hand, when the single yarn fineness is less than 0.0001 dtex, the silk factor of the filament becomes small, which causes a problem in durability of the wiping cloth.

  In addition, the multifilament (hereinafter also referred to as “multifilament A ′”) that is used as the starting material of the multifilament A is generally 10 to 50 dtex, preferably 20 to 40 dtex, and the number of filaments is 5 to 5 40 filaments, preferably 6-30 filaments.

  On the other hand, the multifilament B located in the surface layer portion of the wiping cloth needs to have a single yarn fineness of 0.1 to 10 dtex. Preferably, it is in the range of 0.4 to 4 dtex. As the single yarn fineness becomes smaller than 0.1 dtex, dust is generated. On the other hand, if it exceeds 10 dtex, the wiping cross performance is degraded.

It is important that the boiling water shrinkage of the multifilament B is 10 to 60% of that of the multifilament A. Preferably, it is 40 to 60% of range. When it exceeds 60%, it becomes difficult to form the core-sheath type two-layer structure yarn, and the possibility that the multifilament A appears in the outer layer portion of the wiping cloth and generates dust during wiping increases. On the other hand, if it is less than 10%, the texture becomes hard and not good as a product.
Here, in order to make the boiling water shrinkage of the multifilament B 10 to 60% of the boiling water shrinkage of the multifilament A, the heat set temperature may be controlled when the filament A is drawn.

  The multifilament B usually has a total fineness of 0.1 to 10 dtex, preferably 0.4 to 4 dtex, and a filament count of 12 to 168 filaments, preferably 24 to 144 filaments.

  The multifilament A is preferably an ultrafine fiber made of an island component after the sea part of the sea-island type composite fiber is dissolved. In the above-mentioned sea-island type composite fiber, as the number of islands is larger, the fiber composed of island components after sea dissolution becomes thinner, and the sharp multi-shaving effect and inner trap effect peculiar to ultra-fine fibers can be expected. It is important to be. If it is less than 100 islands, the effect as an ultrafine fiber cannot be expected when the island ratio is small. On the other hand, if it exceeds 1,000 islands, not only the production cost of the spinneret increases, but also the processing accuracy itself tends to decrease. Preferably, it is 500 to 1,000 islands.

  The ratio of the dissolution rate of the sea polymer to the island polymer is preferably 30 to 5,000 times. More preferably, it is 100 to 4,000 times. When the ratio is less than 30 times, a part of the separated island component of the fiber cross-section surface layer portion is dissolved, and the problem that the sea component at the center of the fiber cross-section is not dissolved easily occurs. Thereby, the thickness variation of an island component generate | occur | produces and it exists in the tendency for a problem to fall in a quality. On the other hand, if it exceeds 5,000 times, uneven color due to weight loss will occur, so the quality of the product tends to deteriorate.

  As a polymer constituting such sea-island type composite fiber, the sea component polymer may be any fiber-forming polymer as long as the solvent dissolution rate difference with the island component is 30 times or more, and any of polyamide, polystyrene, polyethylene, etc. The polymer may be used. For example, in the case of an alkaline aqueous solution weight loss polymer, polylactic acid, polyethylene glycol copolymer polyester, and copolyester of 5-sodium sulfonic acid isophthalic acid are optimal. Nylon 6 is dissolved in formic acid, and polystyrene is dissolved in an organic solvent such as toluene. Here, the alkaline aqueous solution refers to potassium hydroxide, sodium hydroxide aqueous solution and the like.

  On the other hand, the island component polymer may be any fiber-forming polymer, and may be any polymer such as polyamide, polystyrene, or polyethylene. Furthermore, the island component is not limited to a round cross section, but may be an irregular cross section.

  The ratio of the sea component is preferably 40 to 5% by weight in order to reduce the thickness of the sea component between the islands and to make a dense wiping cloth. More preferably, it is 10 to 30% of range. If it exceeds 40%, the thickness of the sea component becomes so thick that it is not preferable for separation of sea islands, and a precise wiping cloth cannot be formed. On the other hand, if it is less than 5%, the amount of polymer is too small, and it is difficult to uniformly distribute between a large number of islands.

Next, a preferred method for producing the mixed fiber described above will be described.
Unstretched multifilament A ′ is stretched by a conventionally known stretching method. Here, the temperature received by the yarn being drawn can be set by adjusting the heat treatment time, etc., depending on the type of the heating element, so if it can be adjusted, not only the contact type but also the non-contact type heating element Can be used.
The multifilament A ′ after the drawing heat treatment is mixed with a multifilament B having a single yarn fineness of 0.1 dtex or more manufactured by a conventional method. A conventionally known method may be adopted as the fiber mixing method. For example, stretched heat-treated multifilament A ′ and multifilament B are aligned and supplied to an interlace nozzle with overfeed of 1.0 to 1.5% to produce mixed yarn by disturbing and entanglement To do.

  The mixed yarn is usually knitted and woven after being twisted in a twisting process, and is dyed and processed through an alkali weight reduction process. In the alkali weight reduction step, the multifilament A ′ constituting the mixed fiber is extremely thinned to become a multifilament A which is a very fine fiber, and the multifilament A having a large boiling water shrinkage is cored by the thermal history. In the part, the multifilament B is a core-sheath type two-layer structured yarn located in the sheath part. More specifically, the core portion is composed of multifilament A having a single yarn fineness of 0.0001 or more and less than 0.1 dtex, and the sheath portion is composed of multifilament B having a single yarn fineness of 0.1 to 10 dtex. A two-layer structured yarn is constructed.

The filament B appearing on the surface layer of the wiping cloth may be round or irregular. The sharper the cross section, the better the wiping effect.
Further, the wiping cloth may be any woven structure, and includes all weaves such as plain weave structure, satin weave structure, double weave of these, or changed structure. The knitted fabric may be either a circular knitting or a warp knitting structure.

  The weight ratio (after alkali weight reduction) of the multifilament A and the multifilament B that constitute the wiping cloth of the present invention is 20:80 to 80:20, preferably 30:70 to 70:30. When the weight ratio of the multifilament A is less than 20% by weight, improvement in wiping performance cannot be expected. On the other hand, if it exceeds 80% by weight, the ratio of the multifilament A is too high as compared with B, so that the woven fabric becomes dull.

  Hereinafter, the present invention will be described in more detail by way of examples. The fabric was prepared as follows. Moreover, the measuring method was implemented as follows.

(1) Measurement of weight loss rate The yarn was wound at a spinning speed of 1,000 to 2,000 m / min with a 0.3φ-0.6L × 24H base of each of the sea and island polymers, and the residual elongation was 30. A 75 de / 24 fil multifilament was prepared by stretching to a range of ˜60%. The weight loss rate was calculated from the dissolution time and the dissolution amount at a bath ratio of 100 at a temperature at which the solvent was dissolved in each solvent.

(2) Boiling water shrinkage rate Using a measuring instrument with a frame circumference of 1.125m, create a small skein with 10 strikes, apply a weight of 20-50g, and set the initial skein length L0 (cm). It was measured. The weight was removed and immersed in warm water at 98 ° C. for 30 minutes, then taken out and allowed to dry naturally. After drying, the weight L1 (cm) after shrinkage was measured again by applying a weight. The boiling water shrinkage BWS (%) was calculated by substituting the above L0 and L1 into the following equation.
BWS (%) = [(L0−L1) / L0] × 100
(3) Elongation Measured with a constant-speed elongation type. Elongation is expressed as elongation (%) at break.

(4) Evaluation method of wiping performance Artificial lipid was made to adhere to a glass plate, and it wiped off with the wiping cloth which loaded (125g / 3.9cm < ² >). The sensory evaluation was performed on the glass plate after wiping by five monitors. The monitor evaluated the state when looking at the glass plate according to the following criteria, and those with 20 points or more were judged as ◯, and those with 20 points or less were judged as x.
5 points: The glass plate is not very dirty and very clean.
4 points: The glass plate is clean and not felt dirty.
3 points: The glass plate may be dirty, but it is clean.
2 points: Slightly dirty so that it is assumed that the glass plate would be dirty.
1 point: Dirty enough to be sure that the glass plate would have been dirty.

(5) Dust generation evaluation method The wiping cloth was similarly fixed to the weight used in the wiping performance evaluation method, and the glass plate on which no artificial qualities were adhered was wiped off with the wiping cloth. The sensory evaluation was performed on the glass plate after wiping by five monitors. The monitor evaluated the state when looking at the glass plate according to the following criteria. When there were 4 or more people as ◯, it was judged as ◯, and when it was 4 or less, it was judged as x.
○: Glass is not soiled with fibers and is good.
X: The glass is dirty with fibers and is defective.

Example 1
A blended yarn was prepared using the following yarns.
For multifilament A ′, first, unstretched polyethylene terephthalate obtained by copolymerizing 2 mol% of 5-sodium sulfoisophthalic acid and 3 wt% of polyethylene glycol having a number average molecular weight of 4,000, and the island component is polyethylene terephthalate. Sea-island type composite fiber (1,000 islands, dissolution rate ratio; island: sea = 1: 50, island: sea (weight ratio) = 70: 30) is obtained by drawing a sea-island type composite fiber, 40 dtex, 24 filaments, filament with boiling water shrinkage of 12%.
Multifilament B is a multifilament made of polyethylene terephthalate having 36 dtex, 36 filaments and a boiling water shrinkage of 6%.
Both yarns (multifilament A ′ yarn package 1 and multifilament B yarn package 2) are subjected to the manufacturing process shown in FIG. 1 and are first aligned by a cot roller 3, and the cot roller 3 and a heated heating roller 5 are arranged. Between the heating roller 5 and the take-up roller 7 and wound around the take-up bobbin 8 using a specific contact heater 6 to obtain a mixed yarn. .
The obtained blended yarn was plain woven with a warp and weft of 87 wings x 3 pieces / K and 100 twists on the warp. The obtained woven fabric is immersed in an aqueous sodium hydroxide solution having a concentration of 3.5% by weight and a bath temperature of 98 ° C. to remove sea components, dried, and multifilament B and fiber having a single yarn fineness of 1.0 dtex on the surface of the woven fabric. A woven fabric made of mixed yarn with multifilament A having a single yarn fineness of 0.001 dtex in the inner layer was obtained. The characteristics of this product are shown in Table 1 below.

Example 2
For the multifilament A ′, first, an unstretched sea-island type composite fiber in which the sea component is nylon 6 and the island component is polyethylene terephthalate (500 islands, dissolution rate ratio; only nylon 6 is dissolved, island: sea (weight ratio) = 70:30) is a sea-island type composite fiber obtained by stretching 30 dtex, 6 filaments, and a filament having a boiling water shrinkage of 10%.
The multifilament B is 30 dtex, 144 filament made of polyethylene terephthalate, and a multifilament having a boiling water shrinkage of 4%.
Both yarns are subjected to the manufacturing process shown in FIG. 1, and are first arranged with a cot roller, mixed between the cot roller and the heated heating roller using an interlace nozzle, and further, the heating roller and the take-off roller. A mixed yarn was obtained using a specific contact heater.
The obtained blended yarn was plain woven with a warp and weft of 87 wings x 3 pieces / K, with 100 warps twisted. The obtained woven fabric was immersed in formic acid to remove sea components and dried to obtain a mixed yarn woven fabric having a single yarn fineness of 0.007 dtex and 0.2 dtex. This woven fabric was immersed in boiling water to obtain a woven fabric composed of multifilament B having multifilament B having a single yarn fineness of 0.2 dtex in the fabric surface layer portion and multifilament A having a single yarn fineness of 0.007 dtex in the fiber inner layer portion. The characteristics of this product are shown in Table 1 below.

Comparative Example 1
In Example 1, as multifilament A ′, the sea component was polyethylene terephthalate copolymerized with 2 mol% of 5-sodium sulfoisophthalic acid and 3% by weight of polyethylene glycol having a number average molecular weight of 4,000, and the island component was polyethylene terephthalate. 300 dtex, 6 filaments and multifilaments with a boiling water shrinkage of 12% made of sea-island type composite fiber (25 islands, dissolution rate ratio; island: sea = 1: 50, island: sea (weight ratio) = 70: 30) The other fabrics were made under the same conditions. A woven fabric made of mixed yarn having multifilaments having a single yarn fineness of 1.0 dtex in the fabric surface layer portion and a single yarn fineness of 1.4 dtex in the fiber inner layer portion was obtained. When this fabric was used to wipe a table with oil stains and water droplets, a small amount of stains and water droplets remained, and the wiping performance was poor. The characteristics of this product are shown in Table 1 below.

Comparative Example 2
In Example 2, 30 dtex, 24 filaments, boiling water made of sea island type composite fiber (number of islands 300, island: sea (weight ratio) = 70: 30) of filament A ′ with sea component nylon 6 and island component polyethylene terephthalate A multifilament having a shrinkage rate of 4% was used, and a fabric was then prepared under the same conditions. Multifilaments having a single yarn fineness of 0.007 dtex appeared on the surface layer of the obtained woven fabric. When this fabric was used to wipe a platform with oil stains and water droplets, no stains or water droplets remained and the wiping performance was good, but some fibers remained on the platform and dust was generated from the fabric. It was confirmed that The characteristics of this product are shown in Table 1 below.

  The wiping cloth of the present invention has high wiping properties such as oil and water, high dust trapping power, and low dust generation, so it can be used for household cleaning cloths, glasses and lens wipes, and industrial applications. For example, it can be used in IC or semiconductor manufacturing factories or clean rooms.

It is process schematic for manufacturing the mixed fiber used for this invention.

Explanation of symbols

1: multifilament A yarn package 2: multifilament B yarn package 3: cot roller 4: interlace nozzle 5: heating roller 6: specific contact heater 7: take-up roller 8: take-up bobbin

Claims (5)

Non-crimped multifilament A having a single yarn fineness of 0.0001 or more and less than 0.1 dtex, a single yarn fineness of 0.1 to 10 dtex, and a boiling water shrinkage of 10 to 60% of the multifilament A A wiping cloth made of a non-crimped multifilament B , wherein a multifilament yarn comprising a core-sheath type two-layer structure yarn in which the multifilament A is located in the core and the multifilament B is located in the sheath is used.   The wiping cloth according to claim 1, wherein the multifilament A is an ultrafine fiber made of an island component after the sea part of the sea-island composite fiber is dissolved.   The wiping cloth according to claim 2, wherein the number of islands of the sea-island type composite fiber is 100 to 1,000, and the dissolution rate of the sea polymer to the island polymer is 30 to 5,000 times.   The wiping cloth according to claim 2 or 3, wherein the sea-island type composite fiber has a sea component to island component weight ratio of 40:60 to 5:95. The wiping cloth according to any one of claims 1 to 4, wherein a weight ratio of the multifilament A and the multifilament B is 20:80 to 80:20.

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