JPH10280263A - Nonwoven fabric for wipping material and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a wipping material excellent in wiping-off property of minute stain, having good workability and also having liquid absorbing property. SOLUTION: This nonwoven fabric for wipping materials comprises ultrafine split stable developed by split of a splittable type bicomponent-based conjugate stable fiber composed of mutually incompatible fiber-forming polymers and a nonwoven fabric composed of a short fiber having water-absorbing property and in the nonwoven fabric, pores having 0.2-1.0 mm<2> pore area per pore are arranged in 25-100 numbers/cm arranging density and in unopening part among openings, constitutional fibers are three-dimensionally interlaced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiping material made of a nonwoven fabric.

[0002]

2. Description of the Related Art Conventionally, as a wiping material, a woven or knitted fabric made of cotton or synthetic fiber, a wiping material made of a simple disposable nonwoven fabric, and the like have been widely used.

[0003] Among these wiping materials, a woven fabric, a knitted fabric or a non-woven fabric using ultra-fine fibers is used as a wiping material for wiping particularly fine dust and microscopic dirt such as mirrors and eyeglasses. Cloth using ultra-fine fibers is excellent in wiping off fine dust and micro-dirt attached to mirrors, glasses, etc.In addition, since there is little generation of fiber fuzz and soft touch to the target, mirrors, glasses, It exhibits excellent wiping properties for jewelry, instruments such as pianos, precision instruments, and other items that require careful handling.

[0004] However, fabrics using ultrafine fibers are soft and lacking in stiffness, and thus have a high drape property, and have a problem in that they adhere to an object at the time of wiping and stick together, so that the workability of wiping is sometimes poor. Was. In addition, since the surface is smooth and the contact area with the object is large, the friction coefficient at the time of wiping becomes large, and for stubborn dirt,
There was a problem that the dirt was difficult to remove unless considerable force was applied.

[0005] Further, fabrics using ultrafine fibers are generally hydrophobic, and thus have a problem in that when used, they are inferior in liquid retention properties of detergents and water absorption of wiped water and the like.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and is excellent in wiping off fine dust and micro-dirt adhering to mirrors, spectacles, etc., has good workability, and has both liquid absorbing properties. It is intended to provide a wiping material.

[0007]

The present invention attains the above object and has the following constitution. That is,
The present invention comprises a nonwoven fabric consisting of ultrafine split short fibers expressed by splitting a splittable bicomponent conjugate short fiber composed of mutually incompatible fiber-forming polymers, and a short fiber having water absorption, Has a hole area of 0.2 to 1.0 mm
^{2. A} wiping material characterized in that the holes ² are arranged at an arrangement density of 25 to 100 / cm ² , and the constituent fibers are three-dimensionally entangled with each other in the non-opening portions between the openings. The non-woven fabric for use is a gist.

Further, the present invention provides a fiber-forming high melting point polymer which is incompatible with the fiber-forming low melting point polymer and which has a melting point higher by 30 to 180 ° C. than the melting point of the low melting point polymer. Non-woven fabric comprising ultra-fine split short fibers composed of the low melting point polymer and / or high melting point polymer developed by dividing splittable bicomponent conjugate short fibers composed of a polymer and short fibers having water absorbency Consisting of 1
Holes having an area of 0.2 to 1.0 mm ² are arranged at an arrangement density of 25 to 100 holes / cm ² , and the constituent fibers are three-dimensionally arranged in the non-open area between the open areas. The present invention provides a nonwoven fabric for a wiping material, wherein the nonwoven fabric is entangled and the intersections of the fibers are thermally bonded to each other by a fiber-forming low-melting polymer.

[0009]

Next, the present invention will be described in detail.
First, the splittable bicomponent conjugate short fibers used in the present invention will be described. The splittable bicomponent conjugate short fibers are composed of mutually incompatible fiber-forming polymers. The incompatibility with each other is to make it easy to split the composite staple fiber when subjected to impact.

The splittable bicomponent conjugate short fibers are fibers which are incompatible with the fiber-forming low melting point polymer and the low melting point polymer and have a melting point higher by 30 to 180 ° C. than the melting point of the low melting point polymer. Desirably, it is composed of a formable high melting point polymer. If the difference in melting point between the two is less than 30 ° C., in a later step, when heat-treated, not only the low-melting polymer but also the high-melting polymer will be softened and melted, and a flexible nonwoven fabric will not be easily obtained. For example, when the wiping material is used in contact with a human body, or when wiping a fragile article or the like, the sensation becomes poor in softness and furthermore, the object may be damaged, which is not preferable. On the other hand, the melting point difference is 1
If the temperature is higher than 80 ° C., the low-melting-point polymer is liable to be thermally degraded when melt-spun both polymers, which makes it difficult to practically produce short conjugate fibers, which is not preferable.

As a specific example of the splittable bicomponent conjugate short fiber, one having a cross section as shown in FIGS. 1 to 4 is preferable. In these, both components of the fiber-forming polymer constituting the splittable bicomponent conjugate short fiber are both exposed on the surface of the fiber, and in the cross section of the fiber, one component is split by the other component. It is divided into delicate shapes.

The single yarn fineness of the split type bicomponent conjugate short fiber is as follows:
Preferably it is 1 to 12 denier. Single yarn fineness is 1
When it is less than denier, the discharge amount per single hole of the spinneret during melt spinning is reduced, and the production amount tends to decrease, and in order to improve the production amount, the number of holes in the spinneret is increased. Then, the spinning process becomes unstable. On the other hand, if the single yarn fineness exceeds 12 denier, it tends to be difficult to take off due to insufficient cooling of the melt-spun yarn, and to promote the cooling of the yarn, the number of holes in the spinneret is reduced. , The production volume decreases.

The splittable bicomponent conjugate short fiber is split at the boundary between the two components by a split splitting process, and at least one of the polymer ultrafine split short fibers and the other ultrafine split short fiber is separated. Partially expressed. In the present invention, the single-fiber fineness of the ultrafine split short fibers expressed at least partially is preferably 0.8 denier or less, more preferably 0.05 to 0.8 denier, and still more preferably 0.1 to 0.5. Denier. If the single-fiber fineness is less than 0.05 denier, spinning is practically difficult, and it is difficult to obtain a splittable bicomponent conjugate short fiber at a reasonable cost. In addition, there is a tendency that it is difficult to sufficiently perform split splitting. On the other hand, when it exceeds 0.8 denier, it tends to be inferior to the wiping property of microscopic dirt, and when the nonwoven fabric for a wiping material of the present invention is used in contact with a human body, it tends to feel poor and coarse sensation. It is in.

In the present invention, examples of the fiber-forming polymer constituting the splittable bicomponent conjugate short fiber include a polyolefin-based polymer, a polyamide-based polymer, and a polyester-based polymer.

Further, in the present invention, as a polymer constituting the splittable bicomponent conjugate short fiber, a combination of a low-melting polymer and a high-melting polymer includes polyolefin / polyamide, polyolefin / polyester, polyamide / polyester. And the like, but these are typical examples, and other various combinations may be arbitrarily adopted.

Examples of the fiber-forming polyolefin polymer which can be used in the present invention include aliphatic α-monoolefins having 2 to 16 carbon atoms, for example, ethylene, propylene, 1-butene, 1-pentene, 3 -Methyl 1-butene, 1-hexene, 1-octene, 1-dodecene, 1-
There is a homopolyolefin or a copolymerized polyolefin of octadecene. Aliphatic α-monoolefins may contain other olefins and / or small amounts (up to about 10% by weight of polymer weight)
Other ethylenically unsaturated monomers such as butadiene,
It may be copolymerized with a similar ethylenically unsaturated monomer such as isoprene, 1,3-pentadiene, styrene and α-methylstyrene. Particularly, in the case of polyethylene, a copolymer obtained by copolymerizing propylene, 1-butene, 1-hexene, 1-octene or a similar higher α-olefin with up to about 10% by weight of the polymer weight is preferred because the fiber-forming property is improved.

Examples of the fiber-forming polyamide polymer usable in the present invention include nylon-4 and nylon-4.
6, Nylon-6, Nylon-66, Nylon-61
0, nylon-11, nylon-12, polymetaxylene adipamide (MXD-6), polyparaxylenedecaneamide (PXD-12), polybiscyclohexylmethanedecaneamide (PCM-12) or a monomer of these There is a copolyamide as a unit. Examples of fiber-forming polyester polymers that can be used in the present invention include terephthalic acid, isophthalic acid, phthalic acid, aromatic dicarboxylic acids such as 2,6-naphthalenedicarboxylic acid or adipic acid, sebacic acid and the like as an acid component. Aliphatic dicarboxylic acids or esters thereof, and alcohol components as ethylene glycol, diethylene glycol,
1,4-butanediol, neopentyl glycol,
A homopolyester or a copolyester synthesized from a diol compound such as 1,4-cyclohexanedimethanol, and the homopolyester or the copolyester is added to paraoxybenzoic acid, 5-sodium sulfoisophthalic acid, polyalkylene glycol,
Pentaerythritol, bisphenol A or the like may be added or copolymerized.

Examples of other fiber-forming polymers include:
For example, a vinyl polymer is used, and specifically, polyvinyl alcohol, polyvinyl acetate, polyacrylate, ethylene vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, or a copolymer thereof is used. . Further, a polyphenylene-based polymer or a copolymer thereof can also be used.

The fiber-forming polymer includes a matting agent, a pigment, a flame retardant, a deodorant, an antistatic agent, an antioxidant, an ultraviolet absorber, and the like, as long as the effects of the present invention are not impaired. Arbitrary additives such as antibacterial agents may be added.

The splittable bicomponent conjugate short fibers are generally produced by the following method. That is, spun by a conventionally known melt composite spinning method, using a conventionally known cooling device such as horizontal spraying or annular spraying, and cooled by spraying wind, applying an oil agent, and as an undrawn yarn through a take-off roller. It is wound on a winder. Pickup roller speed is 500m / min ~
2000 m / min. A plurality of wound undrawn yarns are aligned and drawn between a group of rollers having different peripheral speeds by a known drawing machine. Next, the drawn tow is crimped by a press-type crimping device, and then cut into a predetermined fiber length to obtain short fibers. The stretch tow may be subjected to heat setting at a temperature equal to or lower than the melting point of the material depending on the required use.

Next, the water-absorbing short fibers used in the present invention will be described. As the short fibers having water absorbency, it is particularly preferable to use fibers having an official moisture content of 5% or more. Effective fibers having an official moisture content of 5% or more include cotton, hemp, wool, silk fibers cut into short fibers as natural fibers, and viscose rayon, copper ammonia rayon, and solvent-spun rayon as recycled fibers. Used for It is also possible to use synthetic fibers such as vinylon fibers and acrylic fibers having an official moisture of 5% or more. The nonwoven fabric of the present invention may be one obtained by mixing one or two or more of the above-mentioned short fibers having water absorbency.

The nonwoven fabric for a wiping material of the present invention preferably contains 30 to 70% by weight of water-absorbing short fibers. If the water-absorbing short fibers are less than 30% by weight, the wiping properties of water tend to be poor. On the other hand, if the short fiber having water absorption exceeds 70% by weight, the water absorption is sufficient, but the amount of ultrafine split short fibers decreases,
It is difficult to expect dense entanglement between the constituent fibers, and there is a tendency that the ability to collect dust and the ability to wipe off microscopic dirt are poor.

The basis weight of the nonwoven fabric for a wiping material of the present invention is 20 to
It is preferably in the range of 150 g / m ² . Weight 2
If it is less than 0 g / m ² , the formation of the nonwoven fabric will be inferior, and the nonwoven fabric will tend to be poor in form stability and dimensional stability. . If the basis weight exceeds 150 g / m ² , the processing energy of the high-pressure liquid flow treatment for three-dimensionally entangled the constituent fibers becomes large, which is not economically preferable. There is a tendency that the nonwoven fabrics are not sufficiently entangled with each other and have a low mechanical strength.

In the nonwoven fabric for a wiping material of the present invention, one pore having a pore area of 0.2 to 1.0 mm ² has an arrangement density of 25 to
They are arranged at 100 pieces / cm ² . This hole is provided in the subsequent high-pressure liquid flow treatment step, and even if it is an opening penetrating in the thickness direction of the nonwoven fabric, a small amount of fiber is present in the hole. There may be. By arranging such holes in the nonwoven fabric, the holes form recesses,
The nonwoven fabric has a concavo-convex structure such that the edges surrounding the holes (non-opening portions between the openings) form projections. The nonwoven fabric for a wiping material of the present invention has a convex portion (non-opening portion) when used.
It becomes an edge-like shape, removes dirt and dust, and the dirt and dust that have been scraped can be quickly moved to the concave portion (opening portion) or the inter-fiber space to be collected, and have excellent wiping properties. The area of one hole is less than 0.2mm ² or the arrangement density is 2
If the number is less than 5 / cm ² , the effect of forming holes in the nonwoven fabric is undesirably reduced. On the other hand, the area of one hole exceeds 1.0 mm ² or the arrangement density is 100 holes / cm 2.
^If it exceeds ² , the wiping properties and the morphological stability of the nonwoven fabric become poor, which is not preferable from the object of the present invention.

Next, a method for producing the nonwoven fabric for a wiping material of the present invention will be described. In the present invention, first, a splittable bicomponent conjugate short fiber and a short fiber having water absorbency (preferably 7) are used.
(With a cotton mixing ratio of 0/30 to 30/70% by weight), and a nonwoven web having a predetermined basis weight can be produced by using a card method, an air lay method, or the like. In the card method, a carding machine can be used to select various degrees of arrangement of the constituent fibers.
As the arrangement pattern of the constituent fibers, a parallel web in which the constituent fibers are arranged in one direction, a web in which the parallel webs are cross-laid, a random web in which the constituent fibers are randomly arranged, or a semi-random web in which both are moderately arranged. No.

Next, the obtained nonwoven web is subjected to a high-pressure liquid flow treatment to split the splittable bicomponent conjugate short fibers so as to express at least the ultrafine split short fibers and to make the constituent fibers three-dimensional. Confound. The three-dimensional confounding referred to herein means that the fibers constituting the nonwoven web are entangled not only in the vertical / horizontal direction of the nonwoven fabric but also in the thickness direction of the nonwoven fabric, and have an integrated structure. What you do.

The high-pressure liquid flow processing will be described. As a high-pressure liquid flow device for performing the treatment, for example, a large number of injection holes having a hole diameter of 0.05 to 1.5 mm, particularly 0.1 to 0.4 mm are arranged in a line or a plurality of lines at a hole interval of 0.05 to 5 mm. Use an arrayed device. A water stream, ie, a high-pressure liquid stream obtained by jetting at a high pressure from the jet holes is jetted, and collides with a nonwoven web placed on a porous support member. Split type bicomponent conjugate short fibers are impacted by high pressure liquid flow,
Ultrafine split short fibers are developed, and the constituent fibers are three-dimensionally entangled and integrated. At this time, the entanglement of the fibers becomes dense and strong due to the expression of ultrafine split short fibers.

The injection holes are arranged in rows in a direction perpendicular to the direction of travel of the nonwoven web. As a high pressure liquid flow,
Room temperature or hot water can be used. The distance between the injection holes and the nonwoven web is preferably between 10 and 150 mm. If this distance is less than 10 mm, the formation of the nonwoven fabric obtained by this treatment is disturbed, while the distance is 150 mm.
If it exceeds mm, the impact force when the liquid stream collides with the nonwoven web tends to decrease, and the split splitting and entanglement integration tend not to be sufficiently performed.

The processing pressure of the high-pressure liquid flow is controlled by the production method and the required performance of the nonwoven fabric, but generally, a high-pressure liquid flow of 20 to 200 kg / cm ² G is preferably ejected. In addition, depending on the basis weight of the nonwoven web to be treated, etc., within the range of the treatment pressure, it is possible to obtain a nonwoven fabric which is bulky and excellent in flexibility when the treatment pressure is low, and is constituted when the treatment pressure is high. A nonwoven fabric in which the entanglement of the fibers is dense and strong can be obtained. The pressure of the high pressure liquid stream is 20
If the weight is less than kg / cm ² G, split splitting and entanglement integration are not sufficiently performed, and the nonwoven fabric targeted by the present invention cannot be obtained. However, the nonwoven fabric of the present invention also includes nonwoven fabrics in which split bicomponent conjugate short fibers are not sufficiently split and partially remain. Conversely, the pressure of the high pressure liquid flow is 200 kg / c
If it exceeds m ² G, the constituent fibers are cut in an extreme case by impact with water pressure, and in an extreme case, the obtained nonwoven fabric tends to have fluff on the surface, which is not preferable.

Examples of the porous support member for supporting the nonwoven web used in performing the high-pressure liquid flow treatment include a mesh screen and a perforated plate, and the like, in which the high-pressure liquid flow passes through the nonwoven web and the support member. Is used.

In this step, the porous support for supporting the nonwoven web determines the area of the pores to be provided to the nonwoven fabric and the density of the pores, and the coarse density of the mesh of the mesh screen used is arbitrary. In this case, the desired nonwoven fabric for a wiping material can be obtained. Depending on the thickness and texture of the mesh screen mesh, the object of the present invention may be achieved by 15 to 25 mesh (15 to 2 mesh).
(5 / inch) mesh screen is preferably used. As a structure of the mesh yarn of the mesh screen, a structure such as a twill or a ridge is usually used, but it may have a pattern or pattern as long as the object of the present invention is achieved. In addition, not only mesh screens but also those capable of providing a target hole,
For example, it is sufficient if the perforated plate has a large number of protrusions.

In the high-pressure liquid flow treatment step, the nonwoven fabric is
The step of splitting the conjugate fiber and entanglement of the fibers and the step of providing holes may be performed simultaneously or as separate steps. When performed simultaneously, the nonwoven web mixed with cotton is placed on the porous support material for providing the holes, and the high-pressure liquid flow is jetted to split the conjugate fibers and to entangle the fibers, and to mix the fibers. Are simultaneously provided. In the case of performing in a separate step, first, a nonwoven web mixed with cotton is placed on a porous support material having no pores (for example, a relatively fine mesh screen of 30 mesh or more), and is sprayed with a high-pressure liquid stream. The split splitting of the composite fiber and the entanglement of the fibers are performed, and then the entangled nonwoven fabric is placed on a porous support material for providing the pores, and the high-pressure liquid flow is jetted again to obtain the fiber. Is performed by rearranging the holes.

After the high-pressure liquid flow treatment is performed from one side of the nonwoven web, the entangled nonwoven web is subsequently inverted and subjected to the high-pressure liquid flow treatment, so that the nonwoven fabric densely entangled on both sides is obtained. Since it can be obtained, it may be applied to a nonwoven web having a large basis weight or the like according to the use of the nonwoven fabric.

After the high-pressure liquid flow treatment, excess moisture is removed from the treated nonwoven fabric. When removing the excess moisture, a known method can be adopted. For example, the excess water is mechanically removed to some extent using a squeezing device such as a mangle roll, and the remaining water is subsequently removed using a drying device such as a suction band type hot air circulation dryer.

Further, when it is desired to obtain a wiping material which is excellent in durability and dimensional stability and is used for wiping off stronger dirt,
The three-dimensionally entangled nonwoven fabric is preferably subjected to heat treatment using a heat treatment device at a temperature at which the low-melting polymer melts and softens, and the intersections of the constituent fibers are preferably thermally bonded by melt-softening the low-melting polymer. As a heat treatment apparatus to be used, a dry heat hot air circulation system is effectively used. Since the three-dimensionally entangled nonwoven fabric has a stable form as a nonwoven fabric, heat treatment is performed without the constituent fibers being scattered by hot air, and the intersections of the constituent fibers are thermally bonded via the low melting point polymer. You. Since the entangled state of the nonwoven fabric is fixed by thermal bonding, form stability, dimensional stability and mechanical strength are improved while maintaining bulkiness, abrasion resistance, washing resistance,
The durability can be improved. Therefore, the heat-treated nonwoven fabric for wiping can be wiped off more firm dirt without being deformed by the frictional force, and the surface of the nonwoven fabric without fluffing fibers coming off.

The heat treatment temperature is at least a temperature at which the low-melting polymer melts and softens. When the melting point or softening point of the low-melting polymer is (Tm) ° C., (Tm + 5) ° C.
It is preferable to blow hot air of (Tm + 25) ° C. By adopting this temperature range, a nonwoven fabric can be obtained in which only the low melting point polymer is melt-softened and flexibility is maintained without affecting other constituent fibers by heat. When the temperature is lower than (Tm + 5) ° C., the low-melting polymer does not sufficiently melt and soften, so that the heat bonding effect is reduced. on the other hand,
When the temperature exceeds (Tm + 25) ° C., the low-melting polymer softens and flows, and the nonwoven fabric is formed into a film, which gives a feeling of rough hardness. When used in contact with the human body, or when wiping a product that is easily damaged, the feeling of softness is poor, and the object may be damaged.

For the purpose of imparting flexibility to the nonwoven fabric for a wiping material of the present invention, a flexible processing machine using a camfighting machine manufactured by Uenoyama Kiko Co., Ltd. may be used.

[0038]

The nonwoven fabric for a wiping material of the present invention is composed of ultrafine split short fibers and water-absorbing fibers. The nonwoven fabric is provided with holes of a specific size at a specific density, and has irregularities on the surface of the nonwoven fabric. doing.

When the nonwoven fabric for a wiping material of the present invention is used, the projections become edge-like and come into contact with the object, and the ultrafine splitting fibers remove microscopic dirt and dust. If the cross section of the ultrafine splitting fiber is an irregular cross section, the shaving edge portion provides a better shaving effect. Dirt, dust, and the like scraped off by the projections are quickly moved to the depressions and the inter-fiber gaps and accumulated therein, so that they have excellent wiping properties.

The nonwoven fabric for a wiping material of the present invention has a small coefficient of friction because it has a small contact surface with the object and does not adhere too much as compared with the conventional wiping material having a smooth surface, so that it can be easily wiped off even with a weak force. Becomes possible. In addition, the convex portion has a configuration in which short fibers including ultrafine split fibers are entangled with each other and has a soft touch, so that excellent wiping properties can be exhibited without damaging the target object.

The water-absorbing fibers of the constituent fibers are:
The liquid can be quickly absorbed, and the absorbed liquid can be quickly moved to the recesses and inter-fiber spaces by capillary action and stored, so that when used, liquids such as cleaning agents, disinfectants, and cosmetics are effectively retained. It is possible to do.

[0042]

Next, the present invention will be described more specifically based on examples, but the present invention is not limited to these examples. In the examples, the measurement of each characteristic value was performed by the following method. (1) Melting point (° C.) of polymer: DS manufactured by PerkinElmer
Using a C-2 type differential scanning calorimeter, the heating rate was 20 ° C. /
The temperature giving the maximum value of the melting endothermic peak measured in minutes was defined as the melting point.

(2) Relative viscosity of polyester (a): A mixture of phenol and ethane tetrachloride was used as a solvent, and 0.5 g of a sample was dissolved in 100 cc of the solvent. .

(3) Relative viscosity of nylon 6 (b): 96
1 g of a sample was dissolved in 100 cc of 100% sulfuric acid, and determined by a conventional method at a temperature of 25 ° C.

(4) Hole area (mm ² ): Universal projector (produced by Nippon Kogaku Co., Ltd .: Model PROJECTOR V-1)
Using 2), the length in the vertical direction a and the horizontal direction b of the 50 holes are measured in units of mm with three digits after the decimal point, a × b is calculated, and the average value of the area of 50 holes is calculated as the hole area ( mm ² ). In addition, even when a small amount of fiber was present in the hole, the measurement was made assuming that it was not present.

(5) Hole arrangement density (pieces / cm ² ): Universal projector (manufactured by Nippon Kogaku Co., Ltd .: Model PROJECTOR)
Using V-12), the number of holes in 1 cm ² was counted at 10 locations, and the average value was regarded as the arrangement density (pieces / cm ² ).

(6) Tensile strength (kg / 5 cm width) and elongation at break (%): The maximum tensile strength was measured according to the strip method described in JIS L-1096. That is, 10 test pieces having a width of 5 cm and a length of 15 cm were prepared, and a constant-speed elongation type tensile tester (Tensilon UTM-4-1-100 manufactured by Toyo Baldwin Co., Ltd.) was used.
The maximum tensile strength was measured at a tensile speed of 10 cm / min,
The average value of 10 samples was determined as the tensile strength of the nonwoven fabric (kg / 5cm
Width), and the average value of the elongation at break was taken as the breaking elongation (%) of the nonwoven fabric.

(7) Compression stiffness (g): Five specimens each having a width of 5 cm and a length of 5 cm were prepared, bent in the longitudinal direction of the specimen to form a cylindrical body, and the ends thereof were joined. It was used as a sample for measuring the hardness. Constant speed extension type tensile tester (Tensilon UT
M-4-1-100 (manufactured by Toyo Baldwin Co., Ltd.) at a compression speed of 5 cm / min, and the average value of the obtained maximum load values was defined as the compression stiffness (g) of the nonwoven fabric.

(8) Water absorption (mm / 10 minutes): JIS
It was measured according to the birec method described in L-1096.

(9) Abrasion resistance (grade): A reciprocating friction test was performed 100 times using a Gakushin type friction tester, and a five-point evaluation was performed by visual evaluation. Those with no abrasion on the surface of the non-woven fabric and without fluff were rated as class 5, and those with severely abraded on the surface of the non-woven fabric were classified as class 1, and the grade between them was graded as grades 2 to 4.

(10) Dust wiping property: 5 g of sodium chloride, a special-grade reagent manufactured by Katayama Chemical Co., Ltd., was spread on a glass plate as dust, and the sodium chloride on the glass plate was wiped off with a wiping material and left on the glass plate. The weight of the sodium chloride was measured. A wiping material having a wiping property of 70% or more was determined to have excellent wiping properties, and a wiping material having a wiping property of 80% or more was determined to have particularly excellent wiping properties.

Example 1 As a splittable bicomponent conjugate short fiber, the cross section of the fiber was made of polyethylene (melting point 128 ° C., ASTM-
Melt index 20 measured by D-1238 (E) method
g / 10 minutes) and polyethylene terephthalate (melting point 25
A splittable bicomponent conjugate short fiber having a relative viscosity of 8 ° C. and a relative viscosity of 1.38) was prepared.

That is, as shown in FIG. 1, the weight ratio of the composite ratio is 1: 1 from the split-type two-component composite type spinneret in which the total number of divisions is 7, and the single-hole discharge amount = 0.68 g / Extruded in minutes. After the spun yarn was cooled and the finishing oil was applied, it was wound up as an undrawn yarn via a take-up roll having a take-up speed of 1000 m / min. Next, a plurality of the obtained undrawn yarns are drawn and aligned to form a tow, and after drawing at a draw ratio of 3.2 times using a known drawing machine, crimping is performed by a push-in type crimping device. It is applied and cut to a fiber length of 38 mm to produce a short fiber of 2 denier (the fineness of the ultrafine split short fiber made of polyethylene is 1.0 denier, and the fineness of the ultrafine split short fiber made of polyethylene terephthalate is 0.16 denier). Obtained. Cotton bleached cotton having an average fineness of 1.5 denier and an average fiber length of 24 mm was prepared as the short fiber having water absorbency.

A nonwoven web having a basis weight of 80 g / m ² was prepared using a random card machine by mixing 30% by weight of split type bicomponent conjugate short fibers and 70% by weight of water-absorbing short fibers.

Next, the nonwoven web was loaded on a 70-mesh metal mesh screen and subjected to high-pressure liquid flow treatment. The high-pressure liquid flow treatment uses a high-pressure liquid flow treatment device in which injection holes having a hole diameter of 0.1 mm are arranged at a hole interval of 0.6 mm, and a liquid flow pressure of 70 kg / cm ² G from a position 50 mm above the laminate. The treatment was performed under the conditions. Subsequently, the entangled non-woven fabric was loaded on a 15-mesh metal mesh screen, and treated using the orifice at a liquid flow pressure of 70 kg / cm ² G,
The non-woven fabric was given a pore shape. The obtained nonwoven fabric was subjected to removal of excess moisture and drying treatment to obtain a nonwoven fabric of the present invention.

Example 2 The nonwoven fabric obtained in Example 1 was subjected to a heat treatment using a hot air circulating drier (manufactured by Kotobuki Kogyo) at a treatment temperature of 135 ° C. and a treatment time of 30 seconds. Subsequently, a flexible processing machine (manufactured by Uenoyama Kiko Co., Ltd .: Camfit) was used to perform flexible processing to obtain the nonwoven fabric of the present invention.

Example 3 A nonwoven fabric of the present invention was prepared in the same manner as in Example 2 except that 20% by weight of split type bicomponent conjugate short fibers and 80% by weight of water-absorbing short fibers were mixed. I got

Example 4 In Example 2, 70% by weight of split type bicomponent conjugate short fibers and 30% by weight of water-absorbing short fibers were mixed to give a porous shape during high-pressure liquid flow treatment. A nonwoven fabric of the present invention was obtained in the same manner as in Example 2 except that a metal mesh screen of 25 mesh was used as the conductive support material and the heat treatment temperature was 140 ° C.

Example 5 The procedure of Example 2 was repeated, except that 40% by weight of the splittable bicomponent conjugate short fibers and 60% by weight of silk fibers cut into short fibers as water-absorbing short fibers were mixed. In the same manner as in Example 2, a nonwoven fabric of the present invention was obtained.

Example 6 As a splittable bicomponent conjugate short fiber, nylon 6 (melting point: 225 ° C., relative viscosity: 2.55) and polyethylene terephthalate (melting point: 258) were used in a composite form as shown in FIG.
C. and a relative viscosity of 1.38).

That is, as shown in FIG. 2, the composite ratio is set to 1: 1 in weight ratio from the split type two-component type composite spinneret in which the total number of divisions is 24 in the composite form, and the single hole discharge amount = 0. .
Extruded at 76 g / min. After the spun yarn was cooled and the finishing oil was applied, it was wound up as an undrawn yarn via a take-up roll having a take-up speed of 1000 m / min. Next, a plurality of the obtained undrawn yarns are aligned to form a tow,
After performing stretching at a stretching ratio of 3.0 times using a known stretching machine, crimping was performed by a press-in type crimping device, and 38 m was applied.
2.4 denier (fineness of ultrafine split short fiber made of nylon 6 is 0.1 denier, and ultrafine split short fiber made of polyethylene terephthalate is 0.1 denier) I got

As a short fiber having water absorption, hemp was prepared. 50% by weight of split bicomponent conjugate short fibers and 50% by weight of water-absorbing short fibers were mixed, and a nonwoven web having a basis weight of 80 g / m ² was prepared using a random card machine.

Next, the nonwoven web was loaded on a 70-mesh metal mesh screen and subjected to high-pressure liquid flow treatment. The high-pressure liquid flow treatment uses a high-pressure liquid flow treatment device in which injection holes having a hole diameter of 0.1 mm are arranged at a hole interval of 0.6 mm, and a liquid flow pressure of 70 kg / cm ² G from a position 50 mm above the laminate. The treatment was performed under the conditions. Subsequently, the entangled nonwoven fabric is loaded on a 20-mesh metal mesh screen, and treated using the orifice at a liquid flow pressure of 70 kg / cm ² G,
The non-woven fabric was given a pore shape.

The obtained nonwoven fabric was subjected to removal of excess moisture and drying treatment, and then heat treatment was performed using a hot air circulation dryer (manufactured by Kotobuki Industries) at a treatment temperature of 240 ° C. and a treatment time of 30 seconds. went. Subsequently, a flexible processing machine (manufactured by Uenoyama Kiko Co., Ltd .: Camfit) was used to perform flexible processing to obtain the nonwoven fabric of the present invention.

Example 7 As a splittable bicomponent conjugate short fiber, nylon 6 (melting point: 225 ° C., relative viscosity: 2.55) and polyethylene terephthalate (melting point: 258) were used in a composite form as shown in FIG.
C. and a relative viscosity of 1.38).

That is, as shown in FIG. 3, the composite ratio is set to 1: 1 in weight ratio from the split type two-component type composite spinneret in which the total number of divisions is 36 in the composite form, and the single hole discharge amount = 0. .
Extruded at 66 g / min. After the spun yarn was cooled and the finishing oil was applied, it was wound up as an undrawn yarn via a take-up roll having a take-up speed of 1000 m / min. Next, a plurality of the obtained undrawn yarns are aligned to form a tow,
After performing stretching at a stretching ratio of 2.6 times using a known stretching machine, crimping was performed by a press-in type crimping device, and 38 m was applied.
cut into 2.4 m denier (2.47 denier for ultrafine split short fiber made of nylon 6 and 0.07 denier for ultrafine split short fiber made of polyethylene terephthalate) 17% short fibers were obtained. A non-woven web having a basis weight of 120 g / m ² is prepared by mixing a split-type bicomponent conjugate short fiber (30% by weight) and bleached cotton (70% by weight) as a short fiber having water absorbency with a random card machine. A nonwoven fabric of the present invention was obtained in the same manner as in Example 6, except that the water pressure in the liquid flow treatment was changed to 100 kg / cm ² G.

Comparative Example 1 The same procedure as in Example 1 was carried out except that the basis weight of the bleached cotton was 80 g / m.
A nonwoven fabric of Comparative Example 1 was obtained in the same manner as in Example 1 except that the nonwoven web of No. ² was prepared.

Comparative Example 2 A nonwoven fabric of Comparative Example 2 was obtained in the same manner as in Example 2 except that a hole was formed using a 10-mesh metal mesh screen during high-pressure liquid flow treatment. Was.

Comparative Example 3 A nonwoven fabric of Comparative Example 3 was obtained in the same manner as in Example 2 except that the high-pressure liquid flow treatment was not performed.

Table 1 shows the physical properties of the nonwoven fabrics of Examples 1 to 7 and Comparative Examples 1 to 3.

[0071]

[Table 1]

The nonwoven fabric of Example 1 was excellent in mechanical strength and dimensional stability, was particularly excellent in flexibility, had good touch, and had good wiping properties.

The nonwoven fabrics of Examples 2 to 7 were obtained by heat-treating the constituent fibers to each other by heat, and were excellent in mechanical strength, dimensional stability and abrasion resistance. It was excellent in durability use, excellent in flexibility and good in wiping properties.

The nonwoven fabric of Comparative Example 1 in which the splittable bicomponent conjugate short fibers were not blended did not contain the ultrafine split short fibers, so that the constituent fibers were not densely entangled with each other, resulting in micro-fouling. Was difficult to wipe off.

The nonwoven fabric of Comparative Example 2 in which the area of one hole and the density of the holes provided to the nonwoven fabric were out of the range of the present invention was as follows:
Since the area of one hole was large, the adhered sodium chloride was likely to come off to the opposite surface during wiping, and was an unsuitable material as a wiping material.

In the nonwoven fabric of Comparative Example 3 which was not subjected to the high-pressure liquid flow treatment, the split type bicomponent conjugate short fibers were not split and did not contain ultrafine split short fibers. Was not performed, and the wiping property was poor.

[0077]

The nonwoven fabric for a wiping material of the present invention comprises, as constituent fibers, ultrafine split fibers and water-absorbing fibers, holes of a specific size are arranged at a specific density in the nonwoven fabric, and irregularities are formed on the surface of the nonwoven fabric. It has a shape. Therefore, the nonwoven fabric for a wiping material of the present invention is excellent in wiping fine dust and microscopic dirt when used, has both liquid absorbing properties, and has excellent effects in workability due to the uneven structure of the nonwoven fabric surface.

The nonwoven fabric for a wiping material of the present invention can be made of glass, mirror,
It can be effectively used as a wipe in a dry state and a wet state for a wide range of uses, such as eyeglasses, furniture, floors, cars and makeup puffs, towels, and towel wipes.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of one embodiment of a cross section of a splittable bicomponent conjugate short fiber used in the present invention.

FIG. 2 is a schematic diagram showing one embodiment of a cross section of a splittable bicomponent conjugate short fiber used in the present invention.

FIG. 3 is a schematic diagram showing one embodiment of a cross section of a splittable bicomponent conjugate short fiber used in the present invention.

FIG. 4 is a schematic diagram of one embodiment of a cross section of a splittable bicomponent conjugate short fiber used in the present invention.

Claims (8)

[Claims] 1. A nonwoven fabric consisting of ultrafine split short fibers developed by splitting splittable bicomponent conjugate short fibers made of mutually incompatible fiber-forming polymers, and water-absorbing short fibers, The nonwoven fabric has a pore area of 0.2 to 1.0.
The wiping is characterized in that holes having a size of ² mm ² are arranged at an arrangement density of 25 to 100 / cm ² , and constituent fibers are three-dimensionally entangled with each other in a non-opening portion between the openings. Nonwoven fabric for materials. 2. The splittable bicomponent conjugate short fiber has a melting point that is incompatible with the fiber-forming low-melting polymer and the low-melting polymer and that is 30 to 180 ° C. higher than the melting point of the low-melting polymer. The nonwoven fabric for a wiping material according to claim 1, comprising a fiber-forming high melting point polymer. 3. The fiber according to claim 2, wherein the intersections of the fibers are thermally bonded by a fiber-forming low-melting polymer.
The nonwoven fabric for a wiping material according to the above. 4. The fineness of the ultrafine split short fibers, which is at least expressed by splitting the splittable bicomponent conjugate short fibers, is 0.1%.
The nonwoven fabric for a wiping material according to any one of claims 1 to 3, wherein the nonwoven fabric has a denier of 8 deniers or less. 5. The staple fiber having water absorbency is one of a natural fiber and a regenerated fiber.
The nonwoven fabric for a wiping material according to any one of the above. 6. The non-woven fabric according to claim 6, wherein the water-absorbing short fibers contain
The nonwoven fabric for a wiping material according to any one of claims 1 to 5, wherein the nonwoven fabric is mixed with 0 to 70% by weight of cotton. 7. A nonwoven web is obtained by mixing splittable bicomponent conjugate short fibers made of mutually incompatible fiber-forming polymers and short fibers having water absorbency, and the nonwoven web is made of a porous material. It is placed on a support material and subjected to a high-pressure liquid flow treatment to divide the conjugate short fibers so that at least the ultrafine split short fibers are developed and the constituent fibers are three-dimensionally entangled.
A method for producing a nonwoven fabric for a wiping material, wherein holes having a hole area of 0.2 to 1.0 mm ² are arranged at an arrangement density of 25 to 100 holes / cm ² . 8. A fiber-forming low-melting polymer and a fiber-forming high-melting polymer incompatible with the low-melting polymer and having a melting point 30 to 180 ° C. higher than the melting point of the low-melting polymer. A nonwoven web is obtained by blending split-type bicomponent composite short fibers and short fibers having water absorbency, and the nonwoven web is placed on a porous support material and subjected to a high-pressure liquid flow treatment. The short fibers are divided so that at least ultrafine split short fibers are developed, the constituent fibers are three-dimensionally entangled, and one hole having a hole area of 0.2 to 1.0 mm ² is arranged in the nonwoven fabric. After arranging at a setting density of 25 to 100 pieces / cm ² , a treatment is performed at least at a temperature at which the low melting point polymer melts and softens using a heat treatment apparatus, and the intersections of the constituent fibers are thermally bonded. A method for producing a nonwoven fabric for a wiping material.