JP2006255116A - Laminated nonwoven fabric for wiper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated nonwoven fabric for wipers which shows excellent wiping performance, wet breaking strength, a peeling level, liquid-absorbing properties, and soft texture. <P>SOLUTION: The laminated nonwoven fabric is formed by laminating wet-laid nonwoven fabric (II) containing a fibrillated fiber on at least one side of a nonwoven fiber fabric (I) and by integrating through interlacing three-dimensionally. In the laminated nonwoven fabric for wipers, the wet-laid nonwoven fabric (II) contains at least either a fibrillated fiber (X) which is detached from a trunk part by applying shear force and has a diameter equal to or less than 1 μm or a fibrillated fiber (Y) with a branch part which develops from the trunk part with a fiber diameter equal to or more than 2 μm by applying shear force and has a fiber diameter equal to or less than 1 μm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a non-woven fabric having a laminated structure composed of a long-fiber non-woven fabric and a wet non-woven fabric, and the wet non-woven fabric contains fibers and organic fibers fibrillated within a specific range by applying a shearing force. Specifically, the present invention relates to a laminated nonwoven fabric for wipers having excellent wiping property, wet breaking strength, degree of peeling, liquid absorbency, and moderately soft texture.

  In recent years, with the change of living environment and the development of industry and the advancement of technology, the demand for removing dirt is increasing. Dirt includes adhesion of aqueous or oily liquid and solid particles to the solid surface, and particularly solid particles include a wide range of dust, dust, hair, cotton dust and bread crumbs. In order to remove these stains, wipers have been diversified and sophisticated in the field of wipers, where cloths, cloths, paper wastes, etc. have been used in the past. Various types have been proposed and sold.

  Among these various types, the nonwoven fabric for wipers made of ultrafine fibers has a large specific surface area of the constituent fibers, and the ultrafine fibers have the ability to remove fine fine dust and oil film and capture them between the ultrafine fibers. Since it is excellent, it is used preferably. For example, after forming a nonwoven web using a split type fiber, what divided | segmented this split type fiber and produced | generated the ultrafine fiber is known. The nonwoven fabric for wipers composed of these ultrafine fibers is mainly used for splitting fibers that can be easily split by physical means, but the wiping ability is a required function for the nonwoven fabric for wipers, At present, there is still nothing that satisfies all of the liquid absorbency, moderately soft texture, strength, and cost.

  As a non-woven fabric composed of ultrafine fibers, a method is disclosed in which a sea-fiber mixed spun fiber or a long-fiber non-woven fabric composed of a sea-island type composite fiber is subjected to solvent treatment to extract and remove sea components from the fiber (for example, patent documents) 1). However, such a method requires extraction equipment and an extraction process, and thus has various problems in terms of cost, productivity, environment, and the like. Further, the fineness obtained by splitting a hollow type split composite fiber composed of a polymer containing a polypropylene resin having a weight average molecular weight / number average molecular weight ratio of at least 5 and a polymer containing a polyethylene resin. An ultrafine fiber nonwoven wiper containing ultrafine fibers of 0.5 decitex or less (for example, see Patent Document 2) is disclosed. However, since it is a polyolefin-based ultrafine fiber, the problem of poor liquid absorbency and splitting Since the fiber diameter of the subsequent ultrafine fibers is not sufficiently small, there is a problem that the wiping property is inferior.

  A nonwoven fabric comprising multi-particulate composite fibers made of a thermoplastic resin having two or more components, wherein a part of the multi-part composite fiber is divided into fibrils in the nonwoven fabric (for example, patent document) 3) is basically related to the airlaid nonwoven fabric, and the fibrillated part is involved in thermal bonding with the undivided part or the completely divided part. Since a finer three-dimensional network structure is formed inside the nonwoven fabric, the strength is excellent. However, since the nonwoven fabric surface is not covered with many fibrillated fibers, the wiping performance is inferior. is there. Moreover, the nonwoven fabric (for example, refer patent document 4) which consists of a polyvinyl alcohol type | system | group easily split fiber and pulp, and provided the high-pressure water stream to the wet papermaking nonwoven fabric whose mass ratio of both is a fixed ratio, performed the fiber. Although it is disclosed, since it is composed of polyvinyl alcohol-based split fibers and pulp, it has excellent liquid absorbency, but contains 20 to 70% by mass of pulp, so that it has a paper-like texture. is there.

  Further, an acrylic split fiber having a special fiber structure in which a large number of openings of an unspecified shape are formed in the fiber cross section, and each opening forms a streak-like gap along the length direction of the fiber, and one of them. A non-woven fabric of acrylic fiber made of fine fibers and heat-meltable fibers divided into parts is disclosed (see, for example, Patent Document 5). In the process, since it is divided into fine fibers by high-pressure columnar water jet, if the pressure of columnar water jet is low, there is a problem that splitting is not performed sufficiently and wiping performance is inferior, while columnar water jet If the pressure is high, the splitting proceeds, but there is a problem that the nonwoven web is broken.

In recent years, wet wipers have been used in which wiper nonwoven fabrics are impregnated with purified water, ethanol, propylene glycol, etc., or liquid detergents are sprayed onto the surface to be cleaned, and the wiper nonwoven fabrics are strong. A method of wiping off dirt adhering to the surface is frequently performed. In these cases, if the non-woven fabric for wiper has insufficient wet strength, the non-woven fabric for wiper is torn at the time of wiping, and handling is deteriorated, so that there is a disadvantage that good wiping property cannot be obtained. Although a composite sheet in which a paper sheet made of pulp fibers and a spunbond nonwoven fabric are entangled and integrated is disclosed (see, for example, Patent Document 6), in the case of this composite sheet, the wet strength is improved but the wiping performance is improved. There is a handling problem that the pulp fiber layer is peeled off during use.
JP-A-62-97957 JP 2002-220740 A JP 2002-61060 A JP-A-10-53994 JP-A-5-321106 JP-A-9-85870

  Accordingly, an object of the present invention is to provide a laminated nonwoven fabric for wipers that is excellent in wiping property, wet breaking strength, degree of peeling, liquid absorbency, and moderately soft texture.

  As a result of intensive studies to solve the above problems, the present inventors have found the following present invention.

  That is, the first invention of the present application is a laminated nonwoven fabric in which a wet nonwoven fabric (II) containing fibrillated fibers is laminated on at least one side of the long-fiber nonwoven fabric (I) and integrated by three-dimensional entanglement. The non-woven fabric (II) is fibrillated to a fiber diameter of 1 μm or less detached from the trunk by applying a shearing force, and the branching part having a fiber diameter of 1 μm or less from the trunk having a fiber diameter of 2 μm or more is applied by applying the shearing force. The present invention relates to a laminated nonwoven fabric for wipers characterized by containing at least one of the generated fibrillated fibers (Y).

  A second invention of the present application relates to the laminated nonwoven fabric for wiper according to the first invention, wherein the wet nonwoven fabric (II) contains at least one organic fiber (Z) having a fiber diameter of 1 to 20 μm. .

  According to a third invention of the present application, in the first or second invention, in the wet nonwoven fabric (II), the fibrillated fibers (X) and (Y) are fibrillated acrylic fibers, and a shearing force is applied to At least one of the detached fibrillated acrylic fiber (A) having a fiber diameter of 1 μm or less and a fibrillated acrylic fiber (B) in which a branching portion having a fiber diameter of 1 μm or less is generated from a trunk having a fiber diameter of 2 μm or more by applying a shearing force 1 or more types of organic fiber (Z) is contained, the total content of fibrillated acrylic fiber (A) and (B) is 2-100 mass% with respect to wet nonwoven fabric (II), and organic fiber ( The content of Z) is 0 to 98% by mass with respect to the wet nonwoven fabric (II), and the total content of the fibril acrylated fibers (A) and (B) and the organic fiber (Z) is the wet nonwoven fabric (II). 100% by mass or less It relates to a wiper for layered nonwoven fabric, characterized in comprising.

  According to a fourth invention of the present application, in the first to third inventions, the fibrillated acrylic fibers (A) and (B) are composed of an acrylonitrile-based polymer and one or more additive polymers. Is a fiber formed by fibrillating split fiber acrylic fibers in a phase-separated state, and the additive polymer relates to a laminated nonwoven fabric for wipers characterized in that no film is formed on the surface of the wet nonwoven fabric (II). is there.

  According to a fifth invention of the present application, in the first or second invention, in the wet nonwoven fabric (II), the fibrillated fibers (X) and (Y) are fibrillated lyocell fibers, and applying a shearing force, The lyocell fiber (C) fibrillated to a detached fiber diameter of 1 μm or less, and at least one of fibrillated lyocell fiber (D) in which a branching portion having a fiber diameter of 1 μm or less is generated from a trunk part of fiber diameter of 2 μm or more by applying a shearing force 1 or more types of organic fiber (Z) is contained, the total content of fibrillated lyocell fiber (C) and (D) is 2 to 70 mass% with respect to wet nonwoven fabric (II), and organic fiber (Z ) Content of 100% by mass or less with respect to the wet nonwoven fabric (II).

  A sixth invention of the present application relates to the laminated nonwoven fabric for wipers according to the first to fifth inventions, wherein at least one of the organic fibers (Z) is a heat-fusible binder fiber.

  7th invention of this application is the nonwoven fabric (II) in which the wet nonwoven fabric (II) containing a fibrillated fiber is a nonwoven fabric which consists of two or more layers in 1st-6th invention, Comprising: Shear force was applied and it removed from the trunk. Fiber (X) fibrillated to a fiber diameter of 1 μm or less, a surface layer containing at least one of fibrillated fibers (Y) in which a branch part having a fiber diameter of 1 μm or less is generated from a trunk part having a fiber diameter of 2 μm or more by applying a shear force; The present invention relates to a laminated nonwoven fabric for wipers characterized by having an intermediate layer containing organic fibers (Z).

  The laminated nonwoven fabric for wipers of the present invention is a nonwoven fabric having a laminated structure comprising a long-fiber nonwoven fabric and a wet nonwoven fabric, and the wet nonwoven fabric applies shearing force to fibrillate fibers and organic fibers within a specific range. More specifically, the present invention relates to a laminated nonwoven fabric for wipers having excellent wiping properties and strength, particularly wet strength, liquid absorbency, and moderately soft texture.

Hereinafter, the laminated nonwoven fabric for wipers of the present invention will be described in detail.
The long-fiber nonwoven fabric used for the laminated nonwoven fabric for wipers of the present invention refers to a nonwoven fabric obtained by a method of forming a web while drawing or flashing a melt-spun filament, and includes a spunbond nonwoven fabric, a melt-blown nonwoven fabric, a flash-spun nonwoven fabric, etc. Is mentioned. In the present invention, among these long-fiber non-woven fabrics, it is preferable to use a spunbonded non-woven fabric that is excellent in wet and dry strength even with a low basis weight. Examples of the fibers constituting the long-fiber nonwoven fabric include polyester fibers such as polyethylene terephthalate and copolymer polyester, and polyolefin fibers such as polyethylene, polypropylene, and copolymer polypropylene. Examples of the sheath include core-sheath type composite fibers such as polyethylene, polypropylene, cores such as polypropylene and polyester, side-by-side type composite fibers, and polyamide fibers such as nylon 6, nylon 66, and nylon 12. In addition to the round cross section, the cross section of the fiber may be a Y-shaped, V-shaped, U-shaped or other irregular-shaped fiber. Although the basic weight of the long-fiber nonwoven fabric used for the laminated nonwoven fabric for wipers of the present invention is not particularly limited, a range of 5 to 150 g / m ² is preferable. If it is lighter than 5 g / m ² , sufficient strength may not be obtained. On the other hand, if it exceeds 150 g / m ² , the texture may become hard. These long fiber nonwoven fabrics have a fragile air permeability of 10 cc / cm ² · sec or more in order to improve the entanglement of the fibers of both nonwoven fabrics and improve the peel strength when laminated with a wet nonwoven fabric. Is preferred. When the Frazier air permeability is less than 10 cc / cm ² · sec, the entanglement between the fibers of the long fiber nonwoven fabric and the wet nonwoven fabric may be deteriorated. The fragile air permeability refers to a method measured according to JIS L 1096, air permeability test A method.

  The long fiber nonwoven fabric is preferably partially thermocompression bonded, and the area ratio (thermocompression rate) of the thermocompression bonded portion to the long fiber nonwoven fabric surface area is preferably 3 to 35%, more preferably 5 to 25%. It is. If the thermocompression bonding rate is less than 3%, the area through which the fibers of the wet nonwoven fabric can pass increases, which is preferable because the entanglement of the fibers is increased. However, since the crimping area is small, the strength of the long fiber nonwoven fabric tends to decrease, and the laminated nonwoven fabric The strength of the may also decrease. On the other hand, if it exceeds 35%, the entanglement of the fibers of the wet nonwoven fabric decreases, and the peel strength decreases. Moreover, it is preferable that the thermocompression bonding part arrange | positions the whole long-fiber nonwoven fabric equally by shapes, such as circular shape, elliptical shape, a rhombus shape, and square shape.

The wet nonwoven fabric used for the laminated nonwoven fabric for wipers according to the present invention is based on papermaking technology, and short fibers and the like are put into water, and if necessary, a dispersant and a sticking agent are added to rotate a pulper or the like. Mix with a device of the type, disaggregate and uniformly disperse to prepare a fiber suspension with a concentration of about 0.1 to 3%, and then use the suspension to make a wire such as a long mesh, short mesh, or circular mesh Nonwoven fabric and wet papermaking web obtained by papermaking with a paper machine having at least one of the above. Although the basic weight of the wet nonwoven fabric used for the laminated nonwoven fabric for wipers of the present invention is not particularly limited, a range of 5 to 100 g / m ² is preferable. If it is lighter than 5 g / m ² , good wiping performance and peel strength may not be obtained. On the other hand, if it exceeds 150 g / m ² , the texture may become hard.

  The wet nonwoven fabric used for the laminated nonwoven fabric for wipers of the present invention can be achieved by being composed of a wet nonwoven fabric containing fibrillated fibers. Fibrilization refers to a phenomenon in which fibrils (small fibers) appear on the surface due to friction and become fluffy. In the present invention, as a result of diligent investigation, the present inventors have found that fibrillation suitable for the performance of laminated nonwoven fabrics for wipers exists and the degree of fibrillation. That is, at least one of the fiber (X) fibrillated to a fiber diameter of 1 μm or less detached from the trunk, the fibrillated fiber (Y) having a branch diameter of 1 μm or less from the trunk having a fiber diameter of 2 μm or more, and the fiber diameter 1 The nonwoven fabric containing one or more organic fibers of ˜20 μm is dense by the fibrillated fibers being entangled with organic fibers (Z) having a fiber diameter of 1 μm or more and forming a good network structure on the nonwoven fabric surface. While maintaining the wiping performance due to the above, it is possible to collect a large amount of dust and to secure liquid absorption by an appropriate space. One or more organic fibers having a fiber diameter of 1 to 20 μm are entangled three-dimensionally with the fibers of the long-fiber nonwoven fabric, whereby an integrated laminated nonwoven fabric can be achieved. Moreover, when an organic fiber having a fiber diameter of 1 to 20 μm includes two or more kinds of fibers having different fiber diameters, a more space is created in the network structure, which can contribute to an improvement in wiping performance.

  The fibrillated fiber used for the wet nonwoven fabric constituting the laminated nonwoven fabric for wiper of the present invention is not particularly limited as long as it is a fiber that can be fibrillated, but it can be easily fibrillated, so that it is a split fiber acrylic fiber or lyocell fiber. It is preferable to use. Using split fiber acrylic fiber, for example, when other fibers are composed only of synthetic fibers, when used with wet wipers, it can be stored for a long time with the addition of a very small amount of preservative. It has the advantage that a laminated nonwoven fabric for wipers can be manufactured. In addition, when lyocell fibers are used and other fibers used are composed of cellulosic fibers, biodegradable fibers, etc., there is an advantage that a laminated nonwoven fabric for wipers that is friendly to the global environment can be produced. Depending on the purpose and purpose, the split fiber acrylic fiber or lyocell fiber may be properly used, and depending on the situation, both may be used in combination. Hereinafter, the split fiber acrylic fiber and the lyocell fiber will be individually described.

  The split fiber acrylic fiber used for the wet nonwoven fabric constituting the laminated nonwoven fabric for wiper of the present invention is a beater, a PFI mill, a single disc refiner (SDR), a double disc refiner (DDR), as well as a normal pulp fiber. This refers to fibers that can be split and fibrillated with a ball mill, dyno mill or the like used for dispersing or pulverizing pigments, and dispersing equipment. If splitting and fibrillation are possible with these beating and dispersion facilities, there is no particular limitation on the polymer constituting the splittable acrylic fiber. That is, it may be composed only of an acrylonitrile-based polymer used for ordinary acrylic fibers, or may be composed of an acrylonitrile-based polymer and an additive polymer. In view of easy splitting and fibrillation, an acrylic fiber composed of an acrylonitrile-based polymer and an additive polymer is more preferable.

  The copolymerization component of acrylonitrile is not particularly limited as long as it is a copolymerization monomer constituting an ordinary acrylic fiber, and examples thereof include the following monomers. That is, acrylic esters represented by methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate And unsaturated monomers such as acrylic acid esters, acrylic acid, methacrylic acid, maleic acid, acrylamide, styrene, vinyl toluene, vinyl acetate, vinyl chloride, vinylidene chloride, and vinylidene fluoride.

  The additive polymer is not particularly limited, and examples thereof include acrylic resin-based polymers and some polymers. Although the monomer which comprises an acrylic resin polymer is not specifically limited, For example, the following monomers are mentioned, Among these, 1 or more types can be used. That is, acrylic acid esters represented by methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate Methacrylic acid esters such as acrylic acid, methacrylic acid, maleic acid, acrylamide, styrene, vinyl toluene, vinyl acetate, vinyl chloride, vinylidene chloride, vinyl fluoride, vinylidene fluoride, etc. It is. Examples of the polymer other than the acrylic resin polymer include polyvinyl chloride, polyalkylene glycol, polyether compound, polyether ester compound, cellulose acetate, polysulfone, polyvinyl alcohol, polyamide, polyester, and polypeptide.

  When the softening point or glass transition point of the additive polymer used in the split fiber acrylic fiber is lower than the processing temperature in the process of producing the laminated nonwoven fabric for wiper, it takes a temperature above the softening point or glass transition point. There is a possibility that a part or all of the additive polymer is melted and a film is formed so as to cover the fibrillated fibers (A) and (B) on the surface of the nonwoven fabric. In that case, not only the effect of the fibrillated fibers (A) and (B) effective for wiping properties is reduced, but also the liquid absorption property is lowered, which is not preferable. The problem is that the additive polymer having a relatively high softening point or glass transition point is selected, or the temperature of the additive polymer in the process of applying a temperature, such as a drying process or a heat treatment process, is softened. This can be solved by carrying out at a temperature lower than the point or the glass transition point.

  There is no particular limitation on the cross-sectional shape of the split fiber acrylic fiber used for the wet nonwoven fabric constituting the laminated nonwoven fabric for wipers of the present invention, and not only circular and elliptical shapes but also flat, triangular, Y-type, T-type, U-type, star-type , Dog bone type, etc., which have a so-called irregular cross-sectional shape, hollow shape, and branched shape may be used, but from the viewpoint of easy splitting, a circular or elliptical shape is most preferable. . In addition, there is no particular restriction on the cross-sectional shape of the fiber after splitting, but not only circular and elliptical shapes, but also those having irregular cross-sectional shapes such as flat, streaked, American, triangular, etc., but good wiping properties Therefore, it is preferable to have an irregular cross-sectional shape.

  It is important to find the optimal fibrillation conditions in order to maximize the characteristics of split fiber acrylic fibers and to achieve a good balance of performance such as wipeability and liquid absorbency of laminated nonwoven fabrics for wipers. Acrylic fiber (A) fibrillated to a fiber diameter of 1 μm or less released from the trunk by applying a shear force, and a fibril in which a branch part having a fiber diameter of 1 μm or less was generated from the trunk having a fiber diameter of 2 μm or more by applying a shear force It is necessary to contain at least one of two fibrillated acrylic fibers of the fluorinated acrylic fiber (B).

  Fibrilization of the split fiber acrylic fiber can progress to fibrillation and become a material suitable for laminated nonwoven fabrics for wipers, but it is important to determine the optimum beating condition. In order to confirm the fibrillation state in which (A) and (B) are properly present, it is preferable that the fibrillated fiber is sufficiently diluted with water and dried and then observed with a microscope or preferably an electron microscope. . However, it is not necessary to observe each time after determining the optimum beating condition.

  In the wet nonwoven fabric constituting the laminated nonwoven fabric for wipers of the present invention, in order to express the wiping performance, liquid absorption, and strength in a well-balanced manner, (A) the fibrillated fiber with a fiber diameter of 1 μm or less detached from the trunk portion has an aspect ratio (Fiber length / fiber diameter) is 10 to 100,000, preferably 100 to 50,000. Moreover, (B) In the fibrillated acrylic fiber in which the branch part is generated from the trunk part, the aspect ratio of the trunk part is 10 to 50000, preferably 50 to 30000. Further, the aspect ratio of the branch portion is 10 to 100,000, preferably 100 to 50,000. These fibrillation states can be confirmed by microscopic observation as described above.

  When the laminated nonwoven fabric for wipers is formed with only at least one of the fibrillated acrylic fibers (A) and (B), the laminated nonwoven fabric for wipers having good wiping performance and liquid absorbency can be obtained. The peel strength from the nonwoven fabric may be inferior. In that case, in order to improve peeling strength, it is more preferable to mix | blend organic fiber (Z) as a fiber entanglement material of a long-fiber nonwoven fabric and a wet nonwoven fabric. As for the fiber diameter of the organic fiber (Z) used for the laminated nonwoven fabric for wipers of this invention, 1-20 micrometers is preferable, More preferably, it is 3-15 micrometers. When fibers thinner than 1 μm are used, sufficient strength may not be obtained. On the other hand, when fibers thicker than 20 μm are used, wiping performance may be reduced. However, a small amount can be used as long as the effect of the present invention is not impaired. The fiber length of the organic fiber (Z) is not particularly limited as long as the fibers are intertwined with each other. The degree of entanglement is affected by the aspect ratio (fiber length / fiber diameter). The optimum aspect ratio varies depending on the object to be mixed. When mixing with fibrillated acrylic fibers as in the present invention, the range of 700 to 2000 is preferred. If it is less than 700, the fibers are difficult to bend, so that the entanglement between the fibers becomes weak, and the peel strength between the long-fiber non-woven fabric and the wet non-woven fabric or the laminated non-woven fabric may not exhibit sufficient strength. On the other hand, when it exceeds 2000, for example, when a web is produced by a wet papermaking method, it is difficult to obtain a web with a uniform texture, and the wiping property may be uneven.

  In the wet nonwoven fabric constituting the laminated nonwoven fabric for wiper of the present invention, the blending ratio of the acrylic fibers (A) and (B) is not particularly limited, but the total content of the acrylic fibers (A) and (B) with respect to the wet nonwoven fabric is 0. -98 mass% is preferable, More preferably, it is 10-80 mass%, 2-98 mass% is preferable with respect to the wet nonwoven fabric of organic fiber (Z), More preferably, it is 20-90 mass%. If the content of the acrylic fibers (A) and (B) with respect to the wet nonwoven fabric is less than 2% by mass, the fibrillated acrylic fibers cannot be evenly distributed on the nonwoven fabric surface, so that the wiping performance may not be improved. When content with respect to the wet nonwoven fabric of organic fiber (Z) exceeds 98 mass%, there exists a tendency for wiping performance to fall large.

  These organic fibers (Z) include polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, and copolymers thereof, polyolefin fibers such as polyethylene, polypropylene and polystyrene, acrylic fibers such as polyacrylonitrile and modacrylic, nylon 6, Polyamide fibers such as nylon 66 and nylon 12, polyvinyl alcohol fibers, polyvinylidene chloride fibers, polyvinyl chloride fibers, synthetic fibers such as urethane fibers, semi-synthetic fibers such as triacetate fibers and diacetate fibers, viscose rayon, copper ammonia Regenerated cellulose fibers such as rayon, polynosic rayon, and lyocell, and regenerated fibers obtained by spinning a solution of collagen, alginic acid, chitin, and the like are preferable. The polymers constituting these fibers can also be used in the form of homopolymers, modified polymers, blends, copolymers and the like. In addition to the above-mentioned fibers, wood fibers such as softwood pulp, hardwood pulp, wood pulp such as straw pulp, bamboo pulp, kenaf pulp, and herbs can be used as plant fibers. Furthermore, pulp fibers obtained from waste paper, waste paper, and the like are also included. Of course, a composite fiber made of a plurality of these materials may be used. Further, fibers having an irregular cross-section such as T-type, Y-type, and triangle can be included for ensuring wiping properties.

  In the wet nonwoven fabric constituting the laminated nonwoven fabric for wiper of the present invention, the organic fiber (Z) having a fiber diameter of 1 to 20 μm may be a heat-fusible binder fiber. The mechanical strength of the laminated nonwoven fabric for wipers is improved by incorporating the process of increasing the temperature of the nonwoven fabric to a temperature higher than the melting temperature of the binder fiber by incorporating the heat-fusible binder fiber. Examples of the heat-fusible binder fiber include single fibers, and composite fibers such as core-sheath fibers (core-shell type) and parallel fibers (side-by-side type). Since the composite fiber hardly forms a film on the surface of the nonwoven fabric, the mechanical strength can be improved while maintaining the state in which the fibrillated acrylic fiber on the surface of the nonwoven fabric is exposed. Examples of heat-fusible binder fibers include a combination of polypropylene (core) and polyethylene (sheath), a combination of polypropylene (core) and ethylene vinyl alcohol (sheath), a high-melting polyester (core) and a low-melting polyester (sheath). The combination of is mentioned. In addition, single fibers (fully fused type) composed only of low melting point resins such as polyethylene and hot water-soluble binders such as polyvinyl alcohol are easy to form a film in the drying process of the filter medium, but do not hinder the properties. If it is within range, it can be used.

  If the wet nonwoven fabric which comprises the laminated nonwoven fabric for wipers of this invention is a range which does not inhibit the range of this invention, there will be no limitation in the layer structure in particular. That is, it may be a non-woven fabric having a single layer structure or a multilayer structure such as two layers or three layers. For example, in the case of a two-layer structure, an entanglement layer excellent in peel strength, tensile strength, and stiffness between a wiping layer (surface layer) excellent in wiping property and liquid absorption and a long-fiber nonwoven fabric by changing the fiber composition of each layer The function can be divided into (back layer), and a more effective laminated nonwoven fabric for wipers can be obtained. In this case, the surface layer preferably contains 2 to 100% by mass of fibrillated acrylic fibers (A) and (B), more preferably 40 to 90% by mass. When the content of the acrylic fibers (A) and (B) with respect to the wet nonwoven fabric is less than 2% by mass, the fibrillated acrylic fibers cannot be evenly distributed on the surface of the laminated nonwoven fabric, so that the wiping performance may be improved. Moreover, it is preferable that a back layer contains 5-100 mass% of organic fibers (Z), More preferably, it is 50-100 mass%. When the content of the organic fiber (Z) with respect to the wet nonwoven fabric is less than 5% by mass, sufficient peel strength, strength and stiffness of the laminated nonwoven fabric may not be obtained.

  Next, the lyocell fiber will be described. “Lyocell” used in the laminated nonwoven fabric for wipers of the present invention is a fiber term defined in ISO standard and Japanese JIS standard, “cellulose fibers obtained by spinning directly in an organic solvent without spinning through cellulose derivatives. It is said that. Features of lyocell fibers include excellent wet strength, easy fibrillation, and easy strength when formed into a sheet by hydrogen bonds derived from cellulose fibers.

  Lyocell fiber is beater, dispersion equipment such as beater, PFI mill, single disc refiner (SDR), double disc refiner (DDR), ball mill, dyno mill, etc. used for dispersing and crushing pigment, etc. Can be fibrillated. Since lyocell fiber is a raw material of cellulose fiber, it has a characteristic that strength improvement by hydrogen bonding can be expected even after fibrillation. Further, when the wiper laminated nonwoven fabric according to the present invention is used to impregnate the liquid in the wiper laminated nonwoven fabric or to drop the liquid on the surface of the object to be cleaned, the lyocell fiber is slightly swollen so that the wiper laminate is laminated. It will act as a cushion between the surface of the non-woven fabric and the surface of the object to be cleaned, improving handling at the time of wiping and eventually improving the wiping performance.

  The cross-sectional shape of the lyocell fiber used in the wet nonwoven fabric constituting the laminated nonwoven fabric for wipers of the present invention is not particularly limited, and is not only circular or elliptical, but also flat, triangular, Y-shaped, T-shaped, U-shaped, star-shaped, dog Although it may be a so-called irregular cross-sectional shape such as a bone shape, a hollow shape, or a branched shape, a circular shape or an elliptical shape is most preferable from the viewpoint of easy fibrillation. In addition, the cross-sectional shape of the fiber after fibrillation is not particularly limited, but examples thereof include not only circular and elliptical shapes but also flat cross-sectional shapes such as flat, streaked, American characters, and triangles.

  In order to maximize the characteristics of fibrillated lyocell fibers and to achieve a good balance of wipeability, liquid absorption, strength, etc. of laminated nonwoven fabrics for wipers, it is important to find optimal fibrillation conditions. . A lyocell fiber (C) fibrillated to a fiber diameter of 1 μm or less detached from the trunk by applying a shearing force, and a fibril in which a branch part having a fiber diameter of 1 μm or less was generated from the trunk having a fiber diameter of 2 μm or more by applying a shearing force It is necessary to contain at least one of the two fibrillated lyocell fibers of the modified lyocell fiber (D).

  Lyocell fibers can be fibrillated by beating and become a material suitable for laminated nonwoven fabrics for wipers, but it is important to determine the optimum beating conditions. In order to confirm the fibrillation state in which (C) and (D) are properly present, the fibrillated fiber is sufficiently diluted with water or the like and then dried and observed with a microscope, preferably an electron microscope. . However, it is not necessary to observe each time after determining the optimum beating condition.

  In the wet nonwoven fabric constituting the laminated nonwoven fabric for wiper of the present invention, in order to express the wiping performance, liquid absorption, and strength in a balanced manner, (C) the fibrillated fiber having a fiber diameter of 1 μm or less detached from the trunk portion has an aspect ratio (Fiber length / fiber diameter) is 10 to 100,000, preferably 100 to 50,000. Moreover, (D) In the fibrillated lyocell fiber in which the branch portion is generated from the trunk portion, the aspect ratio of the trunk portion is 10 to 50000, preferably 50 to 30000. Further, the aspect ratio of the branch portion is 10 to 100,000, preferably 100 to 50,000. These fibrillation states can be confirmed by microscopic observation as described above.

  When a nonwoven fabric is formed with at least one of the fibrillated lyocell fibers (C) and (D), a relatively good laminated nonwoven fabric for wipers can be obtained with respect to wiping performance and liquid absorbency. In addition, the strength of the laminated nonwoven fabric is greatly inferior, the texture is too soft, the stiffness is lost, and the wiping workability may be inferior. Therefore, in order to develop strength and stiffness, it is preferable to blend organic fiber (Z) as an aggregate of the nonwoven fabric.

  In the wet nonwoven fabric constituting the laminated nonwoven fabric for wiper of the present invention, the blending ratio of the fibrillated lyocell fibers (C) and (D) is not particularly limited, but the total amount of the fibrillated lyocell fibers (C) and (D) with respect to the wet nonwoven fabric is not limited. The content is preferably 2 to 70% by mass, more preferably 10 to 60% by mass. Moreover, 30-98 mass% is preferable, and, as for content with respect to the wet nonwoven fabric of organic fiber (Z), More preferably, it is 40-90 mass%. If the content of the fibrillated lyocell fiber (C) and (D) with respect to the wet nonwoven fabric is less than 2% by mass, the fibrillated lyocell fiber may not be uniformly distributed on the nonwoven fabric surface, so that the wiping performance may not be improved. On the other hand, when it exceeds 70% by mass, not only the strength is lowered, but also the wiping performance against oily dirt may be lowered. Since the fibrillated lyocell fiber is a cellulose fiber, the lipophilicity is inferior to that of the synthetic fiber. If the fibrillated fiber is contained more than necessary, the wiping performance of oily soil may be lowered. If the content of the organic fiber (Z) with respect to the wet nonwoven fabric is less than 30% by mass, the wiping performance against oily dirt and sufficient peel strength and the strength of the laminated nonwoven fabric may not be obtained. The performance may be greatly reduced.

  Even when the fibrillated lyocell fibers (C) and (D) are used, the layer structure of the wet nonwoven fabric constituting the laminated nonwoven fabric for wipers of the present invention is not particularly limited. From a single-layer structure to a multilayer such as two or three layers It may be a structure. For example, in the case of a two-layer structure consisting of a surface layer and a back layer, the surface layer preferably contains 2 to 70% by mass of fibrillated lyocell fibers (C) and (D), more preferably 10 to 10%. 60% by mass. If the content of the lyocell fiber (C) and (D) with respect to the wet nonwoven fabric is less than 2% by mass, the fibrillated lyocell fiber may not be uniformly distributed on the nonwoven fabric surface, and the wiping performance may not be improved. If it exceeds 70% by mass, the wiping performance against strength and oily dirt may be deteriorated. The back layer preferably contains 30 to 100% by mass of organic fibers (Z), more preferably 50 to 100% by mass. If the content of the organic fiber (Z) with respect to the wet nonwoven fabric is less than 30% by mass, sufficient strength and stiffness may not be obtained.

Next, the configuration of the laminated nonwoven fabric for wipers of the present invention in which a long fiber nonwoven fabric and a wet nonwoven fabric are laminated will be described. The layer structure of the long-fiber nonwoven fabric (I) and the wet nonwoven fabric (II) constituting the laminated nonwoven fabric for wipers of the present invention is not particularly limited as long as it does not impair the scope of the present invention. That is, it may be a two-layer structure of (I) / (II), or a three-layer structure of (II) / (I) / (II) or (II) / (I) / (I) / A four-layer structure of (II) or (II) / (I) / (II) / (II) may be used. However, in the case of a multilayer structure of three or more layers, it is necessary to laminate so that the wet nonwoven fabric (II) excellent in wiping property is disposed on the outermost surface. Among these multilayer laminated structures, the two-layer laminated structure (I) / (II) or (II) / (I) / () which is not only satisfactory in wiping performance and strength but also more advantageous from the viewpoint of economy. The three-layer laminated structure of II) is more preferable. The total basis weight of the long-fiber nonwoven fabric and the wet nonwoven fabric constituting the laminated nonwoven fabric for wipers of the present invention is preferably in the range of 15 to 150 g / m ² , more preferably in the range of 40 to 100 g / m ² . If it is lighter than 15 g / m ² , the strength and liquid absorbency may not be sufficient. On the other hand, if it exceeds 150 g / m ² , the texture becomes hard and the flexibility may be inferior.

  Next, the manufacturing method of the laminated nonwoven fabric for wipers of this invention is demonstrated. The nonwoven fabric of this invention is manufactured by the process of fibrillating a fibrillated fiber, the process of manufacturing a wet nonwoven fabric, the process of three-dimensionally interlacing the fiber of a long-fiber nonwoven fabric and a wet nonwoven fabric, and the process of removing (drying) a water | moisture content. After producing the wet nonwoven fabric, the nonwoven fabric can be entangled three-dimensionally with a high-pressure columnar water stream, whereby the strength of the nonwoven fabric can be expressed by the entanglement of the fibers. For this reason, the nonwoven fabric can be provided with sufficient strength without using a heat-fusible binder fiber or by using a small amount of the binder fiber, so that a laminated nonwoven fabric for wipers having a moderately soft texture can be obtained.

  As described above, the step of fibrillating the fibrillated fibers is performed by uniformly suspending the fibrillated fibers in water, beater, PFI mill, single disc refiner (SDR), double disc refiner (DDR), ball mill, dyno mill, etc. Fibrillation is performed under suitable beating conditions in a beating and dispersion facility.

  In this invention, the method of forming a wet nonwoven fabric by the wet papermaking method is used as a process of manufacturing a web. In order to split or fibrillate the fibrillated fiber, the fiber is suspended in water and beaten and dispersed with equipment such as a beater and a PFI mill. This is because suspended and dispersed fibrillated fibers can be used as they are. Fibrilized fibers and organic fibers are put into water, mixed with a rotary apparatus such as a pulper, and dispersed to prepare a fiber suspension having a concentration of about 0.1 to 3%. Next, the suspension is used to make a paper with a paper machine having at least one wire such as a long mesh, a short mesh, or a circular mesh to obtain a wet nonwoven fabric.

Next, the wet nonwoven fabric and the long-fiber nonwoven fabric obtained in this manner are stacked and placed on the porous support, and a high-pressure columnar water stream is sprayed from the wet nonwoven fabric side to entangle the fibers, thereby entangled laminated web. obtain. The porous support is preferably a wire, a punching plate, or the like, and a wire equivalent to 60 to 150 mesh is preferable. The diameter of the nozzle that injects the high-pressure water flow is preferably in the range of 10 to 500 μm, and the interval between the nozzles is preferably 10 to 1500 μm. These nozzles require a range that can be processed with a water flow at least once over the width direction of the web to be conveyed. The water pressure used for entanglement is preferably in the range of 0.5 × 10 ^{6 to} 20 × 10 ⁶ Pa. More preferably ^{5 × 10 6 ~16 × 10 6} Pa. If it is less than 0.5 × 10 ⁶ Pa, confounding may be insufficient and sufficient strength may not be exhibited. If it is higher than 20 × 10 ⁶ Pa, the fibrillated fibers may scatter or the entanglement may become too strong, and the moderately soft texture may be impaired. The processing speed is preferably in the range of 3 to 100 m / min.

  The entangled laminated web thus obtained is dried after removing excess moisture by a method such as suction or wet pressing. As a drying apparatus, a cylinder dryer, an air dryer, an air-through dryer, a suction dryer, or the like is preferable, and it can be used at a temperature at which water is substantially completely removed.

  The laminated nonwoven fabric for wipers in the present invention is a general factory wiper, a clean room wiper, an industrial field such as a printing blanket wiper, a wet field, a business field such as a hand towel, an interpersonal wiper, an objective wiper, an eyeglass wipe, It can be used in various fields such as car wash wipers and household wipers such as dust wipers. Further, the product may be in a dry state or a wet state.

  For example, when used in a wet type, additives used in normal wet wipers, that is, surfactants, ethanol and isopropyl alcohol as fungicides and drying rate improvers, glycerin as a moisturizer, propylene glycol and polyethylene glycol, Moreover, perfume and other antibacterial agents, antibacterial agents, pigments and antioxidants having antiseptic effects may be added in appropriate amounts. The form of the wet type wiper is not particularly limited as long as the wet type wiper is in the form of a package that is housed in a container that can be hermetically sealed and from which the nonwoven fabric for wet type wipers can be pulled out one by one. For example, it may be a cylindrical plastic container storing a nonwoven fabric for wet wiper wound in a roll shape, a pillow package or a paper container stored in a state of being folded one by one, or a combination of these.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to the examples. In the examples, “%” and “part” represent “% by mass” and “part by mass”, respectively, unless otherwise specified. The measuring method of the physical property described in the Example and the comparative example was shown below.
(1) Wipeability (liquid): One drop of olive oil (oily soil) is dropped on a glass plate with a Pasteur pipette, and wiped once with a 100 mm x 100 mm square test piece, the oil on the glass plate The remaining degree was visually observed and evaluated. The evaluation criteria for the wiping property are as follows.
(Double-circle): Oil does not remain at all and is favorable.
○: Almost no oil remains.
Δ: Although oil remains slightly, the effect is recognized.
X: Oil remains almost and there is a problem in practical use.
(2) Wipeability (solid): One drop of baby powder (powder dirt) is lightly dropped on the glass plate with an earpick, wiped once with a 100 mm x 100 mm square test piece, and then the powder on the glass plate The remaining degree was visually observed and evaluated. The evaluation criteria for the wiping property are as follows.
A: Good with no powder left.
Good: Almost no powder remains.
(Triangle | delta): Although powder remains slightly, an effect is recognized.
X: Almost all of the powder remains, and there is a problem in practical use.
(3) Wet breaking strength (unit: N / 50 mm): Based on the method described in JIS L 1096, the breaking strength in the longitudinal direction (flow direction) and the transverse direction (width direction) was measured. The collected sample was put in a separate container and left in water (20 ± 2 ° C.) until it settled under its own weight, and then the measurement was performed. In addition, the sample was 50 mm in width and 200 mm in length, and each sample was measured at a grip interval of 100 mm and expressed as an average value. The unit is N / 50 mm.
(4) Detachment degree: Each test piece of 100 mm × 100 mm was wiped up and down 10 times on a flat desk with an amplitude width of 20 cm, and the delamination property of the laminated nonwoven fabric for wipers at that time was judged. The evaluation was performed by 10 monitors, and the maximum number of evaluations determined by each person was used as the evaluation result. The evaluation criteria for the degree of peeling are as follows.
○: Delamination is not observed, and it is easy to wipe and good.
Δ: Peeling between layers, but no problem in practical use.
X: Delamination occurs, it is difficult to wipe, and there are practical problems.
(5) Water absorption rate (unit: seconds): The water absorption rate was determined as an index of liquid absorption of the laminated nonwoven fabric for wipers described in this example. The water absorption speed is obtained by visually observing the time when the specular reflection disappears and only the wetness remains as the test piece absorbs the water droplets by dropping water, and the unit is seconds. The test method is as follows. A test piece of 200 × 200 mm is prepared. A test piece is attached to a test piece holding frame specified in JIS L1907. Adjust the height from the surface of the test piece to the tip of the burette to be 10 mm high, let one drop of water drop from the burette, and when the water drop reaches the surface of the test piece, the water drop will not give any special reflection Measure time to stopwatch. This operation was performed on five test pieces, and the average value was taken as the water absorption speed.
(6) Texture: The laminated nonwoven fabric for wipers in a dry state and a wet state was gripped by hand, and the tactile sensation at that time was judged. The evaluation was performed by 10 monitors, and the maximum number of evaluations determined by each person was used as the evaluation result. The evaluation criteria for the texture are as follows.
○: Flexible but moderately firm, easy to wipe and good.
Δ: Normal x: Hard or too soft to be wiped off, causing a problem in practical use.

  Non-fibrillar split fiber acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. (Bonnel MV PC 300, 3 dtex x 3 mm) was repeatedly treated 10 times using a double disc refiner, and the average fiber diameter separated from the trunk was 0.9 μm. A fibrillated acrylic fiber (A) was prepared.

  Non-fibrillar split fiber acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. (Bonnel MV PC 300, 3 dtex x 3 mm) is repeatedly treated 30 times using a single disc refiner, and the average fiber diameter is 1 μm from the trunk having an average fiber diameter of 3 μm. A fibrillated acrylic fiber (B) having the following branches was prepared.

  Non-fibrillar split fiber acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. (Bonnel MV PC 300, 3 dtex x 3 mm) is processed 10,000 times using a PFI mill, and fibrillated with a fiber diameter of 1 μm or less detached from the trunk. A mixed fiber (A + B) of acrylic fiber (A) and fibrillated acrylic fiber (B) in which branches having an average fiber diameter of 1 μm or less were generated from a trunk part having an average fiber diameter of 3 μm was prepared.

  A non-fibrillar split fiber acrylic fiber (Bonnel M.V.P C300, 3 decitex × 3 mm) manufactured by Mitsubishi Rayon Co., Ltd. was subjected to 1000 rotation treatment using a PFI mill, and an average fiber diameter of 2. A fibrillated acrylic fiber (B ′) having 5 μm branch portions was prepared.

  A fibrillated lyocell fiber (C) having an average fiber diameter of 0.9 μm detached from the trunk portion was obtained by repeatedly treating a non-fibrillated lyocell monofilament (1.7 decitex × 4 mm) manufactured by Lenzing using a double disc refiner. Prepared.

  Non-fibrillated lyocell monofilament (1.7 decitex x 4 mm) manufactured by Lenzing, Inc. was repeatedly treated 40 times using a single disc refiner, and fibrillation was generated from a trunk portion having an average fiber diameter of 3 μm to a branch portion having an average fiber diameter of 1 μm or less. A lyocell fiber (D) was prepared.

  A fibrillated lyocell fiber (C) having a fiber diameter of 1 μm or less, which has been processed from a trunk by subjecting a non-fibrillated lyocell monofilament (1.7 decitex × 4 mm) made by Lenzing to 40,000 rotations using a PFI mill, and an average fiber A mixed fiber (C + D) of fibrillated lyocell fibers (D) in which branches having an average fiber diameter of 1 μm or less were generated from a trunk portion having a diameter of 4 μm was prepared.

  Non-fibrillated lyocell lyocell monofilament (1.7 decitex x 4 mm) treated with 2000 revolutions using a PFI mill, and a fibrillation in which branches with an average fiber diameter of 2.5 μm were generated from the trunk with an average fiber diameter of 5 μm A lyocell fiber (D ′) was prepared.

Example 1
Mixed fiber (A + B) of fibrillated acrylic fiber (A) and fibrillated acrylic fiber (B), acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. (Bonnell MVP 0.4 decitex x 5 mm: fiber diameter) About 6.7 μm) were each added to 40/60 and mixed in water to prepare a 1% aqueous slurry. Using this aqueous slurry, a wet nonwoven fabric (IIa) having a dry mass of 15 g / m ² was made with an inclined short net paper machine. Next, this wet nonwoven fabric (IIa) and a PET spunbond nonwoven fabric (Ia; E01020: 20 g / m ² ) manufactured by Asahi Kasei Fibers, which is a long-fiber nonwoven fabric, are in the order of (IIa) / (Ia) / (IIa). The three layers were stacked and loaded onto a 76 mesh plain weave plastic wire, and entangled at a pressure (9 × 10 ⁶ Pa) and a processing speed of 15 m / min with the following three nozzle rows. Further, the web was turned over, and water flow was jetted under the same conditions to perform entanglement. The nozzle diameter, nozzle interval, and nozzle arrangement are shown below. The first row has a nozzle diameter of 120 μm and the nozzle spacing of 1.2 mm is arranged in two rows in a staggered pattern, the second row has a nozzle diameter of 100 μm, and the nozzle spacing of 0.6 mm is one straight, and the third row has a nozzle diameter of 100 μm. , Nozzle spacing 0.6mm is in a straight line. Then, after squeezing water with a padder, it dried at 70 degreeC using the air dryer, and the laminated nonwoven fabric for wipers of Example 1 was obtained. The Bonnell M. used in this example. V. PC300 is a split fiber acrylic fiber in which an acrylonitrile copolymer and a methacrylic acid copolymer are blended and both are in a phase-separated state. The glass transition point of the methacrylic acid copolymer is about 70. Although there was no clear softening point at ℃, it was thermally deformed around 140 ℃. As a result of observing the surface of the nonwoven fabric of Example 1 with an electron microscope, film formation of the methacrylic acid copolymer was not observed.

(Example 2)
The laminated nonwoven fabric for wiper of Example 2 was obtained by processing in the same manner as in Example 1 except that only the mixed fiber (A + B) of fibrillated acrylic fiber (A) and fibrillated acrylic fiber (B) was blended. .

(Example 3)
A fibrillated acrylic fiber (A) and an organic fiber (Z) having an acrylic fiber (Bonnell MVP 0.4 decitex x 5 mm: fiber diameter of about 6.7 μm) made by Mitsubishi Rayon Co., respectively, 40/60 Except that, processing was performed in the same manner as in Example 1 to obtain a laminated nonwoven fabric for wiper of Example 3.

Example 4
A fibrillated acrylic fiber (B) and an organic fiber (Z), each having an acrylic fiber (Bonnel MVP 0.4 decitex x 5 mm: fiber diameter of about 6.7 μm) made by Mitsubishi Rayon Co., respectively, 40/60 The laminated nonwoven fabric for wiper of Example 4 was obtained in the same manner as in Example 1 except that.

(Example 5)
Fibrilized acrylic fiber (A), fibrillated acrylic fiber (B ′), and organic fiber (Z) manufactured by Mitsubishi Rayon Co., Ltd. (Bonnel MVP 0.4 decitex × 5 mm: fiber diameter of about 6.7 μm) The laminated nonwoven fabric for wiper of Example 5 was obtained in the same manner as in Example 1 except that the composition was changed to 30/10/60.

(Example 6)
Mixed fiber (A + B) of fibrillated acrylic fiber (A) and fibrillated acrylic fiber (B), acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. (Bonnell MVP 0.4 decitex x 5 mm: fiber diameter) Processed in the same manner as in Example 1 except that the composition was about 6.7 μm) and Teijin Fibers PET fiber (Tepyrus TT04N 3.3 decitex × 10 mm: fiber diameter about 18 μm) was 40/40/20, respectively. The laminated nonwoven fabric for wipers of Example 6 was obtained.

(Example 7)
Mixed fiber (A + B) of fibrillated acrylic fiber (A) and fibrillated acrylic fiber (B), acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. (Bonnell MVP 0.4 decitex x 5 mm: fiber diameter) About 6.7 μm), PET fiber (Melty 4080 1.1 decitex × 3 mm, core-sheath composite heat-sealed fiber: fiber diameter about 10 μm) manufactured by Unitika Fiber Co., respectively, except for 40/40/20. Processing was performed in the same manner as in Example 1 to obtain the laminated nonwoven fabric for wiper of Example 7.

(Example 8)
Mixed fiber (C + D) of fibrillated lyocell fiber (C) and fibrillated lyocell fiber (D), acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. as organic fiber (Z) (Bonnell MVP 0.4 dtex × 5 mm: fiber diameter About 6.7 μm) were each added to 40/60 and mixed in water to prepare a 1% aqueous slurry. Using this aqueous slurry, a wet nonwoven fabric (IIb) having a dry mass of 15 g / m ² was made with an inclined short net paper machine. Next, this wet nonwoven fabric (IIb) and a PET spunbond nonwoven fabric (Ia; E01020: 20 g / m ² ) manufactured by Asahi Kasei Fibers, which is a long-fiber nonwoven fabric, are in the order of (IIb) / (Ia) / (IIb). Three layers are stacked and stacked on a 76 mesh plain weave plastic wire, and entangled at the pressure (8.5 × 10 ⁶ Pa) and the processing speed of 15 m / min using the three nozzle rows shown below. It was. Further, the web was inverted, and water jetting was performed under the same conditions for entanglement. The nozzle diameter, nozzle interval, and nozzle arrangement are shown below. The first row has a nozzle diameter of 120 μm and the nozzle spacing of 1.2 mm is arranged in two rows in a staggered pattern, the second row has a nozzle diameter of 100 μm, and the nozzle spacing of 0.6 mm is one straight, and the third row has a nozzle diameter of 100 μm. , Nozzle spacing 0.6mm is in a straight line. Then, after squeezing water with a padder, it dried at 130 degreeC using the air dryer, and the laminated nonwoven fabric for wipers of Example 8 was obtained.

Example 9
A blend of fibrillated lyocell fiber (C) and organic fiber (Z) made by Mitsubishi Rayon Co., Ltd. acrylic fiber (Bonnell MVP 0.4 decitex × 5 mm: fiber diameter of about 6.7 μm) is 40/60 respectively. The laminated nonwoven fabric for wiper of Example 9 was obtained in the same manner as in Example 8 except that.

(Example 10)
A blend of fibrillated lyocell fiber (D) and organic fiber (Z) with acrylic fiber (Bonnel MVP 0.4 decitex x 5 mm: fiber diameter of about 6.7 μm) manufactured by Mitsubishi Rayon Co., respectively, 40/60 Except that, processing was performed in the same manner as in Example 8 to obtain a laminated nonwoven fabric for wiper of Example 10.

(Example 11)
Fibrilized lyocell fiber (C), fibrillated lyocell fiber (D '), and organic fiber (Z) made by Mitsubishi Rayon Co., Ltd. acrylic fiber (Bonnell MVP 0.4 decitex x 5 mm: fiber diameter of about 6.7 μm) The laminated nonwoven fabric for wiper of Example 11 was obtained by processing in the same manner as in Example 8 except that the formulation was changed to 30/10/60.

(Example 12)
Mixed fiber (A + B) of fibrillated acrylic fiber (A) and fibrillated acrylic fiber (B), mixed fiber (C + D) of fibrillated lyocell fiber (C) and fibrillated lyocell fiber (D), organic fiber (Z) Processed in the same manner as in Example 1 except that Mitsubishi Rayon acrylic fiber (Bonnell MVP 0.4 decitex x 5 mm: fiber diameter of about 6.7 μm) was blended to 20/20/60 respectively. The laminated nonwoven fabric for wipers of Example 12 was obtained.

(Example 13)
Two layers in the order of long-fiber nonwoven fabric (Ia) / wet nonwoven fabric (IIa) are stacked and stacked on a 76-mesh plain weave plastic wire and entangled at a pressure (8 × 10 ⁶ Pa) and a processing speed of 15 m / min. The laminated nonwoven fabric for wiper of Example 13 was obtained in the same manner as in Example 1 except that.

(Example 14)
A PP spunbond non-woven fabric (Ib; P03020: 20 g / m ² ) manufactured by Asahi Kasei Fibers Co., Ltd. was used as the long fiber non-woven fabric, except that the two layers were stacked in the order of (IIa) / (Ib) / (IIa). Processing was performed in the same manner as in Example 1 to obtain a laminated nonwoven fabric for wiper of Example 14.

(Example 15)
Processing was carried out in the same manner as in Example 8 except that only the fibrillated lyocell fiber (C) was blended to obtain the laminated nonwoven fabric for wiper of Example 15.

(Example 16)
The laminated nonwoven fabric for wiper of Example 16 was obtained in the same manner as in Example 8 except that only the fibrillated lyocell fiber (D) was blended.

(Example 17)
Mixed fiber (A + B) of fibrillated acrylic fiber (A) and fibrillated acrylic fiber (B), and Teijin Fibers made PET fiber (TT04 6.6 decitex × 5 mm: fiber diameter of about 25 μm) as organic fiber (Z), respectively. The laminated nonwoven fabric for wiper of Example 17 was obtained in the same manner as in Example 1 except that the composition was 40/60.

(Example 18)
Mixed fiber (C + D) of fibrillated lyocell fiber (C) and fibrillated lyocell fiber (D), and PET fiber (TT04 6.6 decitex × 5 mm: fiber diameter of about 25 μm) manufactured by Teijin Fibers Ltd. as organic fiber (Z), respectively The nonwoven fabric for wipers of Example 18 was obtained by processing by the same method as Example 8 except having set it as 40/60.

(Comparative Example 1)
Processing was carried out in the same manner as in Example 1 except that only an acrylic fiber (Bonnel MVP 0.4 decitex x 5 mm: fiber diameter of about 6.7 μm) manufactured by Mitsubishi Rayon Co., Ltd. was blended as the organic fiber (Z). The laminated nonwoven fabric for wipers of Comparative Example 1 was obtained.

(Comparative Example 2)
A laminated nonwoven fabric for wiper of Comparative Example 2 was obtained in the same manner as in Example 3 except that fibrillated acrylic fiber (A ′) was blended instead of fibrillated acrylic fiber (A).

(Comparative Example 3)
A laminated nonwoven fabric for wiper of Comparative Example 3 was obtained in the same manner as in Example 3 except that fibrillated acrylic fiber (B ′) was blended in place of fibrillated acrylic fiber (A).

(Comparative Example 4)
A laminated nonwoven fabric for wiper of Comparative Example 4 was obtained by processing in the same manner as in Example 8 except that only the mixed fiber (C + D) of fibrillated lyocell fiber (C) and fibrillated lyocell fiber (D) was blended. .

(Comparative Example 5)
Except for using the PET spunbonded nonwoven fabric (E01020: 20 g / m ² ) manufactured by Asahi Kasei Fibers, which is a long-fiber nonwoven fabric, it was carried out except that the layers were stacked in the order of (IIa) / (IIa) / (IIa). Processing was performed in the same manner as in Example 1 to obtain a wiper nonwoven fabric of Comparative Example 5.

(Comparative Example 6)
Instead of fibrillated acrylic fiber (A), non-fibrillated split fiber acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. (Bonnell MV P C300, 3 dtex × 3 mm) was blended as it was without beating. Were processed in the same manner as in Example 1 to obtain a laminated nonwoven fabric for wiper of Comparative Example 6.

(Comparative Example 7)
Instead of the fibrillated lyocell fiber (C), Example 8 except that the fibrillated lyocell single fiber (1.7 decitex × 4 mm, manufactured by Coatles) was blended as it was without beating. The laminated nonwoven fabric for wiper of Comparative Example 7 was obtained in the same manner as in Example 1.

(Comparative Example 8)
Without using a wet nonwoven fabric, using a PET spunbond nonwoven fabric (Ia; E01020: 20 g / m ² ) manufactured by Asahi Kasei Fiber, which is a long-fiber nonwoven fabric, two layers are stacked in the order of (Ia) / (Ia). Except having laminated | stacked, it processed by the same method as Example 1, and the laminated nonwoven fabric for wipers of the comparative example 8 was obtained.

(Comparative Example 9)
Wet nonwoven fabric (IIa) and PET spunbonded nonwoven fabric (Ia; E01020: 20 g / m ² ) manufactured by Asahi Kasei Fibers, which is a long-fiber nonwoven fabric, are made into three layers in the order of (IIa) / (Ia) / (IIa). After the overlapping, 5 g / m ^{2 of} the acrylic emulsion was adhered to the solid content, and then heat treated at 150 ° C. to bond the fibers together to obtain a laminated nonwoven fabric for wiper of Comparative Example 9.

  The wiper nonwoven fabrics obtained in Examples 1 to 18 and Comparative Examples 1 to 9 were evaluated by the evaluation test described above, and the results are shown in Tables 1 and 2.

  From Tables 1 and 2 above, as shown in Examples 1 to 18, the laminated nonwoven fabric for wipers of the present invention is not only excellent in wiping of oil stains and fine particles, wet breaking strength, and degree of peeling, but also excellent in liquid absorption. In addition, it can be seen that a moderately soft texture suitable for wiping is used. On the other hand, as shown in Comparative Examples 1 to 9, when the type and composition of the fibers constituting the nonwoven fabric are outside the scope of the present invention, the wipeability, wet breaking strength, and peeling are greater than those of the laminated nonwoven fabric for wipers of the present invention. It can be seen that any of the degree, liquid absorbency, and texture is greatly inferior.

(Example 19)
Mixed fiber (A + B) of fibrillated acrylic fiber (A) and fibrillated acrylic fiber (B), acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. (Bonnell MVP 0.4 decitex x 5 mm: fiber diameter) The laminated nonwoven fabric for wiper of Example 19 was obtained in the same manner as in Example 1 except that about 6.7 μm) was set to 2/98.

(Example 20)
Mixed fiber (A + B) of fibrillated acrylic fiber (A) and fibrillated acrylic fiber (B), acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. (Bonnell MVP 0.4 decitex x 5 mm: fiber diameter) The laminated nonwoven fabric for wiper of Example 20 was obtained in the same manner as in Example 1 except that about 6.7 μm) was set to 98/2.

(Example 21)
Mixed fiber (C + D) of fibrillated lyocell fiber (C) and fibrillated lyocell fiber (D), acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. as organic fiber (Z) (Bonnell MVP 0.4 dtex × 5 mm: fiber diameter The laminated nonwoven fabric for wiper of Example 21 was obtained in the same manner as in Example 8 except that about 6.7 μm) was set to 2/98.

(Example 22)
Mixed fiber (C + D) of fibrillated lyocell fiber (C) and fibrillated lyocell fiber (D), acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. as organic fiber (Z) (Bonnell MVP 0.4 dtex × 5 mm: fiber diameter The laminated nonwoven fabric for wiper of Example 22 was obtained in the same manner as in Example 8 except that about 6.7 μm) was 70/30.

(Example 23)
Mixed fiber (A + B) of fibrillated acrylic fiber (A) and fibrillated acrylic fiber (B), acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. (Bonnell MVP 0.4 decitex x 5 mm: fiber diameter) A slurry for surface layer having a concentration of 1% was prepared with a blending ratio of about 6.7 μm) to 95/5. A slurry for intermediate layer having a concentration of 1% was prepared by blending only organic fiber (Z) with acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. (Bonnell MVP 0.4 decitex x 5 mm: fiber diameter of about 6.7 μm). . Each web with a dry weight of the surface layer of 7 g / m ² and a dry weight of the back layer of 8 g / m ² was made by two inclined short web machines, and the surface layer and the back layer 2 A wet non-woven fabric (IIc) having a dry mass of 15 g / m ² and made of layers was made. Next, this wet nonwoven fabric (IIc) and a PET spunbonded nonwoven fabric (Ia; E01020: 20 g / m ² ) manufactured by Asahi Kasei Fibers, which is a long-fiber nonwoven fabric, are placed so that the surface side of the wet nonwoven fabric (IIc) is the surface. Three layers in the order of (IIc) / (Ia) / (IIc) are stacked and stacked on a 76-mesh plain-woven plastic wire, and the pressure (9 × 10 ^{6) is} applied with the three nozzle rows shown below. Pa), and entangled at a processing speed of 15 m / min. Further, the web was turned over, and water flow was jetted under the same conditions to perform entanglement. The nozzle diameter, nozzle interval, and nozzle arrangement are shown below. The first row has a nozzle diameter of 120 μm and the nozzle spacing of 1.2 mm is arranged in two rows in a staggered pattern, the second row has a nozzle diameter of 100 μm, and the nozzle spacing of 0.6 mm is one straight, and the third row has a nozzle diameter of 100 μm. , Nozzle spacing 0.6mm is in a straight line. Then, after squeezing water with a padder, it dried at 70 degreeC using the air dryer, and the laminated nonwoven fabric for wipers of Example 23 was obtained.

(Example 24)
Mixed fiber (C + D) of fibrillated lyocell fiber (C) and fibrillated lyocell fiber (D), acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. as organic fiber (Z) (Bonnell MVP 0.4 dtex × 5 mm: fiber diameter A slurry for the surface layer having a concentration of 1% was prepared with a blending ratio of about 6.7 μm) to 40/60. Mixed fiber (C + D) of fibrillated lyocell fiber (C) and fibrillated lyocell fiber (D), acrylic fiber manufactured by Mitsubishi Rayon Co., Ltd. as organic fiber (Z) (Bonnell MVP 0.4 dtex × 5 mm: fiber diameter A slurry for the back layer having a concentration of 1% was prepared with a blending ratio of about 6.7 μm) to 5/95. Each web with a dry weight of the surface layer of 7 g / m ² and a dry weight of the back layer of 8 g / m ² was made by two inclined short web machines, and the surface layer and the back layer 2 A wet non-woven fabric (IId) having a dry mass of 15 g / m ^{2 with} the layers laminated together was made. Next, the wet nonwoven fabric (IId) and the PET spunbond nonwoven fabric (Ia; E01020: 20 g / m ² ) manufactured by Asahi Kasei Fibers, which is a long-fiber nonwoven fabric, are placed so that the surface layer side of the wet nonwoven fabric (IId) is the surface. , (IId) / (Ia) / (IId) in three layers and stacked on a 76-mesh plain weave plastic wire, and the pressure (9 × 10 ⁶ Pa), and entangled at a processing speed of 15 m / min. Further, the web was turned over, and water flow was jetted under the same conditions to perform entanglement. The nozzle diameter, nozzle interval, and nozzle arrangement are shown below. The first row has a nozzle diameter of 120 μm and the nozzle spacing of 1.2 mm is arranged in two rows in a staggered pattern, the second row has a nozzle diameter of 100 μm, and the nozzle spacing of 0.6 mm is one straight, and the third row has a nozzle diameter of 100 μm. , Nozzle spacing 0.6mm is in a straight line. Then, after squeezing water with a padder, it dried at 130 degreeC using the air dryer, and the laminated nonwoven fabric for wipers of Example 24 was obtained.

  The laminated nonwoven fabrics for wipers obtained in Examples 19 to 24 were evaluated by the evaluation test described above, and the results are shown in Table 3.

  From Table 3 above, as shown in Examples 19 to 24, in the case of the laminated nonwoven fabric for wipers of the present invention, a laminated nonwoven fabric for wipers having good wiping properties, wet breaking strength, degree of peeling, liquid absorption, and texture can be obtained. I understand. Further, from Examples 23 and 24, in particular, when a three-layer structure is formed using a long-fiber nonwoven fabric and a two-layer wet nonwoven fabric, the laminated nonwoven fabric for wipers has excellent wiping property, wet breaking strength, and degree of peeling. You can get that.

  The laminated nonwoven fabric for wipers of the present invention is excellent in wiping property, wet breaking strength, degree of peeling, liquid absorbency, moderately soft texture, and industry such as general factory wipers, clean room wipers, printing blanket wipers It can be used for various purposes such as industrial fields, hand towels, business fields such as hand towels, interpersonal wipers, objective wipers, glasses wipes, automobile car wash wipers, and dust wipers.

Claims (7)

  A wet nonwoven fabric (II) containing fibrillated fibers is laminated on at least one surface of the long fiber nonwoven fabric (I), and is a laminated nonwoven fabric integrated by three-dimensional entanglement, wherein the wet nonwoven fabric (II) applies a shearing force. The fiber (X) fibrillated to a fiber diameter of 1 μm or less detached from the trunk part, and at least of the fibrillated fibers (Y) in which branches having a fiber diameter of 1 μm or less are generated from the trunk part having a fiber diameter of 2 μm or more by applying a shearing force A laminated nonwoven fabric for wipers characterized by containing one.   The laminated nonwoven fabric for wiper according to claim 1, wherein the wet nonwoven fabric (II) contains at least one organic fiber (Z) having a fiber diameter of 1 to 20 µm.   In the wet non-woven fabric (II), the fibrillated fibers (X) and (Y) are fibrillated acrylic fibers, and the fibrillated acrylic fibers (A) having a fiber diameter of 1 μm or less detached from the trunk by applying a shearing force, shearing Fibrillated acrylic containing at least one of fibrillated acrylic fibers (B) in which branches having a fiber diameter of 1 μm or less are generated from a trunk having a fiber diameter of 2 μm or more and one or more organic fibers (Z) by applying force The total content of the fibers (A) and (B) is 2 to 100% by mass with respect to the wet nonwoven fabric (II), and the content of the organic fibers (Z) is 0 to 98 with respect to the wet nonwoven fabric (II). The total content of the fibrillated acrylic fibers (A) and (B) and the organic fibers (Z) is 100% by mass or less based on the wet nonwoven fabric (II). The wiper according to 2 Laminated non-woven fabric.   Fibrilized fibers acrylic (A) and (B) are obtained by fibrillating split fiber acrylic fibers in which the acrylic fibers are composed of an acrylonitrile-based polymer and one or more additive polymers, and both are in a phase-separated state. The laminated nonwoven fabric for wipers according to any one of claims 1 to 3, which is a fiber, and the additive polymer does not form a film on the surface of the wet nonwoven fabric (II).   In the wet non-woven fabric (II), the fibrillated fibers (X) and (Y) are fibrillated lyocell fibers, and the lyocell fibers (C) fibrillated to a fiber diameter of 1 μm or less detached from the trunk by applying a shearing force. Applying force, it contains at least one of the fibrillar lyocelled fibers (D) in which branches having a fiber diameter of 1 μm or less are generated from the trunk part having a fiber diameter of 2 μm or more, and one or more kinds of organic fibers (Z). The total content of the fibers (C) and (D) is 2 to 70% by mass with respect to the wet nonwoven fabric (II), and the content of the organic fibers (Z) is 100% by mass or less with respect to the wet nonwoven fabric (II). The laminated nonwoven fabric for wiper according to claim 1 or 2, wherein   The laminated nonwoven fabric for wiper according to any one of claims 1 to 5, wherein at least one of the organic fibers (Z) is a heat-fusible binder fiber.   A wet nonwoven fabric (II) containing fibrillated fibers is a nonwoven fabric having a layer structure of two or more layers, and a shearing force is applied to the fibers (X) fibrillated to a fiber diameter of 1 μm or less detached from the trunk, and the shearing force In addition, it has a surface layer including at least one of fibrillated fibers (Y) in which branches having a fiber diameter of 1 μm or less are generated from a trunk having a fiber diameter of 2 μm or more, and an intermediate layer including organic fibers (Z). The laminated nonwoven fabric for wipers according to any one of claims 1 to 6.