JP2003061886A - Wiping cloth or filter cloth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiping cloth or filter cloth with an excellent performance. SOLUTION: The wiping cloth or filter cloth is laminated and bonded with a paper layer and a nonwoven fabric layer. The paper layer is bonded with main fiber by fusing thermobonding fiber. The nonwoven fabric layer is mainly composed of ultra fine fiber formed by splitting splittable conjugate fiber. The paper layer and the nonwoven fabric layer are laminated and joined by fusing the thermobonding fiber to be integrated with each other. Both sides thereof is formed with a number of wrinkles and shows a crepe structure. Preferably, a wet paper 1 and a nonwoven fabric 9 are laminated to obtain a lamination, the surface of the wet paper 1 is closely fitted to the surface of a rotating drum dryer 7, and the paper layer and the nonwoven fabric layer are joined to obtain a laminated sheet. And then the laminated sheet is unsticked from the surface of the drum dryer 7 and conveyed at a lower speed than the surface speed of the drum dryer 7 to obtain the wiping cloth or filter cloth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiping cloth or a filtering cloth in which a paper layer and a dry non-woven fabric layer are integrally bonded.

[0002]

2. Description of the Related Art Conventionally, as a wiping cloth for wiping off fine dust, a knitted woven fabric or a non-woven fabric having ultrafine fibers as constituent fibers has been used. For example, as a non-woven fabric having ultrafine fibers as constituent fibers, it is known that an ultrafine fiber is produced by forming a nonwoven web using splittable conjugate fibers and then splitting the splittable conjugate fibers. There is. Such an ultrafine fiber nonwoven fabric is preferable because the ultrafine fibers are excellent in the ability to remove fine dust and capture it between the ultrafine fibers. Therefore, it is used as a cloth for wiping glasses such as spectacle lenses, or as a cloth for clean rooms.

In order to further improve the performance of such a wiping cloth, for example, unevenness is provided on the front and back surfaces of an ultrafine fiber non-woven fabric to increase the surface area and enhance the dust capturing ability, and further the dust removing performance by the convex portion. It is possible to increase As means for providing irregularities on the front and back surfaces of the ultrafine fiber nonwoven fabric, conventionally,
There is a method using crepe processing applied to fabrics. This method, as a constituent fiber of the ultrafine fiber non-woven fabric, a shrinkable fiber and a non-shrinkable fiber are mixed, and the shrinkable fiber is shrunk to form a slack or a loop in the non-shrinkable fiber. This is a method of producing unevenness on the back surface. Therefore, when an ultrafine fiber is used as the non-shrinkable fiber, it is necessary to adopt another fiber that is more easily contracted than the ultrafine fiber (for example, the hot water shrinkage ratio is larger than that of the ultrafine fiber). In addition, the shrinkable fiber also has an excellent ability to remove fine dust, like the ultrafine fiber, and it is necessary to select a fiber that can trap dust well between the fibers. If you use shrinkable fibers that do not have the same performance as ultrafine fibers,
Even if the surface area is increased or convex portions are formed on the front and back surfaces, the performance as a wiping cloth may be rather poor. Therefore, the above-mentioned method is limited in the range of materials, fiber length, fiber diameter (fineness), etc. of the ultrafine fibers and shrinkable fibers to be used, and thus has the drawback of being less flexible and difficult to use.

In the conventional method for producing crepe paper, the wet paper made from paper is dried on a cylindrical dryer, and a doctor blade (creping doctor blade) is applied to the surface of the dryer to peel off the dried paper. , Crepe (wrinkle) was given. In order to apply the crepe, the wet paper must be in close contact with the surface of the dryer, and the paper conveyance speed after peeling from the dryer must be slower than the peripheral speed of the dryer. That is, the paper moves on the dryer at the same speed as the peripheral speed, and after the paper is peeled off from the dryer, the moving speed of the paper slows down, and the crepe is applied due to this speed difference. It is considered that when such a method for producing crepe paper is applied to a dry non-woven fabric containing ultrafine fibers as a constituent fiber except the paper making step, a crepe non-woven fabric having a large number of irregularities (wrinkles) on the front and back surfaces can be obtained. However, since the dry non-woven fabric does not adhere to the surface of the dryer like wet paper, the difference between the moving speed on the dryer and the moving speed after peeling from the dryer (speed difference at peeling)
No crepe can be given. Therefore, even if the conventional method for producing crepe paper is adopted, it is difficult to obtain a wiping cloth having many irregularities on the front and back surfaces.

Further, it is also considered that the wiping cloth made of the ultrafine fiber non-woven fabric is made to absorb water in order to impart liquid absorbency. In order to impart water absorbency, a method of mixing water-absorbent fibers such as rayon fibers and polyvinyl alcohol fibers in the ultrafine fiber nonwoven fabric, or a nonwoven fabric containing water-absorbent fibers such as paper or rayon fibers in the ultrafine fiber nonwoven fabric is used. There is a method of pasting. However, in the former method, since ultrafine fibers and water-absorbent fibers having a relatively large fiber diameter are mixed, the larger the amount of water-absorbent fibers (the higher the water-absorption), the finer the amount of fine dust. There is a drawback that the removal performance is reduced. On the other hand, in the latter method, since the sizing agent layer is interposed between the ultrafine fiber nonwoven fabric and the paper or the like, the passage of water between the ultrafine fiber nonwoven fabric and the paper or the like is obstructed, and water absorption or water retention is greatly improved. Can't hope Further, when a general paper composed only of wood pulp is used as the paper, paper dust and wood pulp fall off, which is not preferable as a wiping cloth.

[0006]

SUMMARY OF THE INVENTION From the above-mentioned viewpoints, an object of the present invention is to improve both the dust trapping performance and the liquid absorbing performance in comparison with the conventional ultrafine fiber nonwoven fabric. That is, the present invention is to form a large number of wrinkles on the front and back surfaces to increase the surface area and form convex portions on the front and back surfaces,
An object of the present invention is to provide a wiping cloth or a filtering cloth having improved water absorption by improving the dust capturing performance and the dust removing performance, and by bonding a specific paper layer to a microfiber nonwoven fabric by a specific means. In the present invention, a state in which many wrinkles are formed on the front and back surfaces is referred to as a crepe structure.

[0007]

A wiping cloth or a filter cloth according to the present invention which solves the above problems is formed by laminating and bonding a paper layer and a dry non-woven fabric layer, and the main fiber of the paper layer is a heat-adhesive fiber. The dry non-woven fabric layer is composed mainly of ultrafine fibers produced by splitting of splittable conjugate fibers, and the paper layer and the dry non-woven fabric layer are composed of the heat-adhesive fibers. It is characterized by being integrally joined by fusion and having a crepe structure as a whole.

The wiping cloth or filter cloth according to the present invention comprises a paper layer and a dry non-woven fabric layer. The paper layer is formed by bonding the main fibers by fusing the heat-adhesive fibers. The main fiber is selected from the group consisting of natural fibers such as wood pulp, chemical pulp, synthetic pulp (fibrid), plant fiber, rayon fiber, polyester fiber, polyamide fiber, acrylic fiber, polypropylene fiber, polyethylene fiber and the like. The seeds may be used alone or in combination of two or more. As is clear from this description, the term "main fiber" used in the present invention means that the main constituent of the paper layer is formed, and ordinary wood pulp, chemical pulp, and synthetic resin are fibrillated. In addition to the synthetic pulp,
Semi-synthetic fibers, synthetic fibers, etc. are also used. Further, as is clear from this description, in the present invention, the term "paper layer" is generally called paper (including synthetic paper), which is mainly composed of wood pulp, chemical pulp, and synthetic pulp. Not only those, but also those referred to as a wet non-woven fabric mainly composed of fibers such as synthetic fibers are included. The length (fiber length) and diameter (fiber diameter) of the main fiber may be those conventionally used for producing paper, synthetic paper, or wet non-woven fabric.

When used as a wiping cloth, it is preferable to use, as the main fibers in the paper layer, wood pulp, chemical pulp, rayon fibers or the like having excellent water absorption. This is because the water absorption by the paper layer is improved, and the liquid absorbing power of the wiping cloth can be increased. In addition, an organic oily substance (aliphatic oil or fat) or an inorganic oily substance (mineral oil) may be applied in order to impart oil absorption to the paper layer or improve dust adsorption. In addition, when the main purpose is not to improve water absorption, hydrophobic fibers such as polyester fibers and polypropylene fibers may be used. In particular, when crimped fibers are used as such a hydrophobic fiber, the paper layer becomes bulky and coarse, and the dry non-woven fabric layer becomes a dense layer, which makes it suitable as a filter cloth. . That is, relatively coarse dust can be filtered through a coarse paper layer, and relatively fine dust can be filtered through a fine dry nonwoven fabric layer, so that the dense nonwoven fabric layer is less likely to be clogged, and the filtration fabric can have a long life. At the same time, since the surface area is enlarged, the filtration area is widened and can be suitably used as a filtration cloth. Furthermore, among the pulps, the use of a bulky pulp treated with a crosslinking agent or a pulp treated with a high-concentration alkali makes it possible to impart bulkiness, and is suitable as a wiping cloth or a filter material.

The heat-adhesive fibers contained in the paper layer bond the main constituent fibers, which are the main constituents, by fusion bonding. Further, the paper layer and the dry non-woven fabric layer are joined by fusion bonding. As the heat adhesive fiber, dry heat or wet heat adhesive fiber is used. As the main fiber, one that is not softened, melted, deteriorated or deteriorated at a temperature at which the thermoadhesive fiber exhibits adhesiveness is used. Typically,
The temperature at which the heat-adhesive fiber exhibits adhesiveness is 70 to 160 ° C.
The range is preferably. Further, as specific examples of the heat-bonding fibers, wet-heat bonding fibers such as polyvinyl alcohol fibers, dry-heat bonding fibers such as ethylene-vinyl acetate copolymer fibers and polyethylene fibers are used. As the heat-adhesive fiber, a core-sheath type composite fiber comprising a core component of a high melting point polymer and a sheath component of a low melting point polymer, a high melting point polymer having a half-moon cross section and a low melting point having a half-moon cross section. It is also possible to use a side-by-side type composite fiber obtained by laminating a polymer. In this case, the low melting point polymer becomes the heat-adhesive component. Typical combinations of the high melting point polymer / low melting point polymer are polypropylene / ethylene-vinyl acetate copolymer, polyester / polyethylene, polyester / modified polyester and the like. The heat-adhesive fiber has a fiber length of 3
It is preferably about 20 mm, and more preferably about 5 to 10 mm. The fineness of the heat-adhesive fiber is 0.5 to 1
About 0 denier is preferable, about 1.0 to 7 denier is more preferable, and about 1.5 to 5 denier is most preferable.

The mixing ratio of the main fiber and the heat-adhesive fiber in the paper layer is as follows: main fiber: heat-adhesive fiber = 50-9
It is preferably from 9:50 to 1 (% by weight), particularly 70
More preferably, it is from 97:30 to 3 (% by weight).
If the amount of heat-bondable fibers exceeds this range (there are too few main fibers), the texture of the paper layer may become hard, and the main fibers such as wood pulp and rayon fibers If water-absorbent fibers are used, the water absorption will decrease. The dry weight of the paper layer is 10-50g.
It is preferably in the range of about ² / m, in particular 15 to 35 g / m ²
Is more preferable.

On the other hand, the dry-type nonwoven fabric layer is mainly composed of ultrafine fibers produced by splitting splittable conjugate fibers. The splittable conjugate fiber may be a long fiber or a short fiber. Generally, long fibers are preferred. Dry non-woven fabric obtained by depositing long fibers as they are (for example, spun-bond non-woven fabric by the spun-bond method)
This is because it can be more rationally manufactured than a dry non-woven fabric obtained by cutting long fibers into short fibers (for example, card non-woven fabric by the card method). The fineness of the splittable conjugate fiber is a matter that can be arbitrarily determined, but is preferably 2 to 12 denier. The split type composite fiber has a fineness of 2
When it is less than denier, it becomes difficult to produce the splittable conjugate fiber by the melt spinning method. Further, when the fineness of the splittable conjugate fiber exceeds 12 denier, the fineness of the ultrafine fibers produced by the splitting tends to increase, and the fine non-woven fabric layer tends to have a reduced dust removing performance.

The splittable conjugate fiber has the following cross section:
The polymer component A and the polymer component A which are incompatible with the polymer component A are laminated. The polymer components A and B are incompatible with each other in order to facilitate the separation of the two. When the splittable conjugate fiber is split, it is split into ultrafine fibers composed of the polymer component A and ultrafine fibers composed of the polymer component B. Specific examples of the bonding of the polymer components A and B include the modes shown in FIGS. 1 to 8, but are not limited thereto. 1 and 2 are cross-sectional views of the splittable conjugate fiber, respectively.
Is formed by alternately laminating a large number of polymer components A having a substantially wedge-shaped cross section and polymer components B having a substantially wedge-shaped cross section, and the cross-sectional shape of the splittable conjugate fiber as a whole is circular. There is something. In FIG. 2, a large number of polymer components A having a substantially trapezoidal cross section and polymer components B having a substantially trapezoidal cross section are alternately laminated, and the cross sectional shape of the splittable conjugate fiber as a whole is shown in FIG. Hollow circle (that is, C in FIG. 2 indicates a hollow portion)
It has become. The splittable conjugate fibers shown in FIG. 1 and FIG. 2 are for producing ultrafine fibers made of the polymer component A and ultrafine fibers made of the polymer component B by splitting them.

FIGS. 3 to 5 show that a plurality of polymer components A having a circular cross section are embedded in an outer peripheral portion of a polymer component B having an irregular cross section in a state of being embedded. is there. The thing of FIG. 3 has a large degree of embedding, and about half of the outer periphery of the polymer component A is embedded. In FIG. 4, the degree of embedding is small, and about 1/4 to 1/6 of the outer periphery of the polymer component A is embedded. The one in FIG. 5 has a greater degree of embedding than that in FIG. 3, and about 3/4 to 5/6 is embedded.
The splittable conjugate fibers shown in FIGS. 3 to 5 are for producing ultrafine fibers composed of the polymer component A by splitting them. The fiber composed of the polymer component B has a fiber diameter relatively larger than that of the ultrafine fiber composed of the polymer component A. In the present invention, the fiber produced by the division of the splittable conjugate fiber is referred to as an ultrafine fiber. Since it is called, the fiber made of the polymer component B is also included in the concept of the ultrafine fiber.

6 to 8 show a plurality of polymer components A and B having a crescent-shaped cross section, which are alternately laminated and laminated. In FIG. 6, the crescent-shaped polymer components A and B are laminated and laminated, and the cross-sectional shape of the splittable conjugate fiber as a whole is circular. 7 is the same as the case of FIG. 6 except that the cross-sectional shape of the splittable conjugate fiber as a whole is a hollow circle. The one in FIG. 8 is
The cross sectional shape of the splittable conjugate fiber as a whole is the same as that of FIG. By splitting the splittable conjugate fibers shown in FIGS. 6 to 8, ultrafine fibers having a flat cross section and a strip shape are produced.

Specific combinations of the polymer component B and the polymer component A (component B / component A) include polyamide-based polymer / polyester-based polymer, polyolefin-based polymer / polyester-based polymer and polyolefin-based polymer. Coalescent / polyamide-based polymers can be used. As the polyester polymer, polyethylene terephthalate, polybutylene terephthalate, or a copolyester having these as a main component can be used. As the polyamide-based polymer, nylon 6, nylon 46, nylon 66, nylon 610, or copolymer nylon having these as the main components can be used. As the polyolefin-based polymer, polypropylene, high-density polyethylene, linear low-density polyethylene, ethylene-propylene copolymer and the like can be used. In the polymer component B and / or the polymer component A, if desired, a lubricant, a pigment, a matting agent, a heat stabilizer, a light stabilizer, an ultraviolet absorber, an antistatic agent, a conductive agent, a heat storage agent, etc. Agents and the like may be added.

The dry non-woven fabric layer is mainly composed of ultrafine fibers produced by splitting the splittable conjugate fiber. Therefore, other fibers than the splittable conjugate fiber may be mixed in a ratio of about 50% by weight or less. The fiber diameter (fineness) of the ultrafine fibers is preferably about 0.1 to 1 denier,
In particular, it is more preferably about 0.1 to 0.3 denier. When the fiber diameter of the ultrafine fibers exceeds 1 denier, it becomes difficult to provide the dry non-woven fabric layer with the ability to remove fine dust when used as a wiping cloth. It is difficult to make the fiber diameter of the ultrafine fibers less than 0.1 denier for the reason of manufacturing the splittable conjugate fiber. 9 is a transverse cross-sectional view showing a state in which the splittable conjugate fiber shown in FIG. 3 is split, and ultrafine fibers made of the polymer component A and ultrafine fibers made of the polymer component B are produced. It is a thing. The weight of the dry non-woven fabric layer is
Generally heavier than paper layer is preferably in the range of about 10 to 60 g / m ^2, it is preferred in particular 15 to 30 g / m ² approximately.

Since the splittable conjugate fiber is composed of the combination of the polymer component A and the polymer component B as described above, the splitting produces the ultrafine fibers A derived from the component A and the ultrafine fibers B derived from the component B. To do. At this time, since both the ultrafine fibers A and the ultrafine fibers B are produced from the splittable conjugate fiber, they have the same length. However, if the polymer component A and the polymer component B having different shrinkage ratios such as heat shrinkage ratio and hot water shrinkage ratio are used and subjected to heat treatment after division, the heat shrinkage ratios of the ultrafine fibers A and the ultrafine fibers B Therefore, the length of the ultrafine fiber having a smaller heat shrinkage is longer. Then, sagging occurs in the ultrafine fibers, and the cloth becomes a wiping cloth or a filtering cloth having a relatively bulky feel.

In the present invention, the paper layer and the dry non-woven fabric layer are laminated and joined by fusing the heat-adhesive fibers mixed in the paper layer. That is, the heat-adhesive fibers mixed in the paper layer bond the main fibers in the paper layer to each other by fusion and also bond the paper layer and the dry non-woven fabric layer. The heat-adhesive fibers are generally evenly present in the paper layer and therefore also present on the surface of the paper layer. Then, by fusion bonding of the heat-adhesive fibers present on this surface, the main fibers and the ultrafine fibers are bonded,
As a result, the paper layer and the dry nonwoven fabric layer are joined together. The degree of the layered joint between the paper layer and the dry non-woven fabric layer may be any joint strength as long as it is recognized that the two are integrated. That is, as long as it is used as a wiping cloth or a filtering cloth, the paper layer and the dry non-woven fabric layer are not easily separated from each other or easily lifted between both layers during handling.

A large number of wrinkles are formed on the front and back surfaces of the wiping cloth or filter cloth formed by laminating and bonding the paper layer and the dry non-woven fabric layer to form a crepe structure. This wrinkle may be irregularly provided on the front and back surfaces of the wiping cloth or filter cloth,
It may be provided regularly. Further, the length and height of the wrinkles may be any. In the present invention, the crepe wrinkles are spread over the entire width in the width direction of the wiping cloth or the filter cloth, and the interval between the adjacent crepe wrinkles is 0.3 to
It is preferable that they are regularly arranged at about 6.0 mm,
In particular, it is more preferable that they are arranged at about 0.7 to 3.5 mm. In addition, the crepe wrinkles may be not only linear but corrugated. Japanese Examined Utility Model Publication No. 49-47372 discloses a doctor blade in which the shapes of the cutting edges are arranged in a scoop shape to form irregularities. The crepe wrinkles formed by such a doctor blade look like a vertical and horizontal cross pattern in appearance. This doctor blade can also be used to more effectively split the splittable conjugate fiber. By providing such a large number of wrinkles, the surface area is expanded and convex portions are formed on the front and back surfaces, and when used as a wiping cloth, water retention, dust trapping ability and dust removing performance are improved. Further, when used as a filter cloth, the surface area is enlarged, so that the filter area is increased and the dust capturing ability is improved.

The wiping cloth or filter cloth according to the present invention generally comprises only two layers, a paper layer and a dry non-woven fabric layer. Therefore, when the surface of the wiping cloth or the filtering cloth is a paper layer, the back surface is a dry non-woven fabric layer, and many wrinkles are formed in each layer. Weight of wipes or filter cloth according to the present invention is preferably in the range of about 22~110g / m ^2, and more preferably, especially 25~75g / m ² approximately. Further, the wiping cloth or filter cloth according to the present invention also includes a cloth in which two layers of a paper layer and a dry non-woven fabric are laminated together. For example, the one having a layer structure such as a dry non-woven fabric layer / paper layer / paper layer / dry non-woven fabric layer, which is obtained by laminating the paper layers so that they are in contact with each other, can be used as a wiping cloth or a filter according to the present invention. Included in the concept of cloth. Such a wiping cloth or filter cloth is a dry non-woven fabric layer on both front and back surfaces, and many wrinkles are formed on both surfaces.

Next, in order to manufacture the wiping cloth or filter cloth according to the present invention, for example, the following manufacturing method is adopted. That is, a wet paper obtained by making a paper stock containing heat-adhesive fibers and main fibers, and a dry non-woven fabric having splittable conjugate fibers as constituent fibers are laminated to obtain a laminate, and then the laminate is prepared. The wet paper surface of the object is brought into close contact with the peripheral surface of the cylindrical heating body rotating at a constant peripheral speed, the wet paper is dried, and the main fibers are bonded to each other by fusion bonding of the heat-adhesive fibers. A paper layer is formed, and the paper layer and the dry non-woven fabric are joined by fusion bonding of the heat-adhesive fibers to obtain a laminated sheet, and then a doctor is provided between the peripheral surface of the cylindrical heating body and the paper layer. By pressing a blade, peel the laminated sheet from the peripheral surface of the cylindrical heating body,
A method of transporting the laminated sheet at a speed lower than the constant speed so as to develop a crepe structure in the laminated sheet and divide the splittable conjugate fiber in the dry nonwoven fabric to generate ultrafine fibers. Is adopted.

The manufacturing method will be described in detail below. First, a paper stock containing a main fiber and a heat-bonding fiber is prepared. As the main fiber and heat-bondable fiber,
Any of the above can be used. When it is desired to use crimped fibers as the main fibers of the paper layer, it is preferable to include latent crimpable fibers in the paper stock. The latently crimpable fiber does not develop crimps in the paper material and develops crimps in the drying step. Thus, the reason for using the latently crimpable fiber is that the crimped fiber is difficult to be uniformly dispersed and suspended in the paper material. As the latently crimpable fiber, it is preferable to use a composite fiber in which two components having different hot water shrinkage rates are combined in a side-by-side type or an eccentric core-sheath type. When wood pulp or plant pulp is used as the main fiber, it is preferable to mix a paper strength enhancer in the paper stock in order to improve the dry wet strength of the obtained paper layer. As the paper strength enhancer, conventionally known cationized starch, polyacrylamide, polyamide / polyamine / epoxy resin, carboxymethyl cellulose / alkali metal salt and the like can be used. As described above, in this production method, the main fiber, the heat-adhesive fiber, and other optional components are suspended and dispersed in water by a conventional method to prepare a paper stock. This paper material is formed into a wet paper by a conventionally known paper making method such as a cylinder paper making method, a fourdrinier paper making method, a short net paper making method, an inclined short wire paper making method, a twin wire method, a former method. . In this manufacturing method, the “wet paper” means a wet web in a state in which the stock is made and then dried.

A laminate obtained by laminating a dry non-woven fabric having the above-mentioned splittable conjugate fiber as a constituent fiber on such a wet paper is obtained. The dry non-woven fabric can be produced by a conventionally known method. For example, when the splittable conjugate fiber is a long fiber, the spun bond method is adopted (spun bond non-woven fabric).
Is preferred. When the splittable conjugate fiber is a short fiber, it is preferable to adopt the card method (a card nonwoven fabric). The splittable conjugate fiber in the dry non-woven fabric is
It is preferable that the fibers are fixed to each other by a known means. For example, the polymer component B of the splittable conjugate fiber (which has a lower melting point than the polymer component A) may be fused and fixed between the splittable conjugate fibers. This fusion is
It is preferable to apply it partially rather than on the entire surface of the non-woven fabric, and it is particularly preferable to use a so-called point-bonded non-woven fabric in which the fused regions are arranged in a scattered manner. This is because if the entire surface of the non-woven fabric is fused and fixed, it is difficult to split the splittable conjugate fiber in a later step. In addition, the splittable conjugate fibers are fixed to each other by intertwining the splittable conjugate fibers, or particularly by binding with a binder resin in the card nonwoven fabric, and further by binding with the heat-fusible fiber. May be.

A laminate of a wet paper web and a dry non-woven fabric,
The wet paper is dried so that the wet paper surface is in close contact with the heated surface. The heating surface is a surface heated to a temperature at which the wet paper web is dried, and specifically means the peripheral surface of the cylindrical heating body. Such a heating surface, while drying the wet paper,
It rotates at a constant peripheral speed to convey the laminate.
The speed may be any speed as long as the wet paper web is dried to form a paper layer when the wet paper web is separated from the heating surface. In addition, in this manufacturing method, the "laminate" means a state in which a wet paper web and a dry non-woven fabric are laminated, and
The "laminated sheet" means a state in which a paper layer formed by drying a wet paper web and a dry nonwoven fabric are laminated and joined. Further, in this manufacturing method, the term "dry non-woven fabric" means the case where the splittable conjugate fibers that are the constituent fibers are not yet split, and "dry non-woven fabric layer".
In this case, the splittable conjugate fiber is in a state after splitting and forming ultrafine fibers.

In this manufacturing method, it is necessary that the wet paper and the heating surface are in close contact with each other. Being in close contact means
This means that the laminate is fixed on the heating surface, and the peripheral speed of the heating surface and the moving speed of the laminate are substantially the same. The reason why the two are in close contact with each other is as follows. That is, in this manufacturing method, the laminated sheet after being peeled from the heating surface by the doctor blade is conveyed at a speed lower than the peripheral speed of the heating surface, so that a difference in the moving speed of the laminated sheet occurs before and after the peeling. . Then, by utilizing this speed difference, wrinkles are caused on the laminated sheet after peeling. For example, if the moving speed of the laminated sheet is the same before and after peeling, it is not possible to cause wrinkles in the laminated sheet. Therefore, the laminate must be in intimate contact with the heating surface so that it moves at approximately the same speed as the peripheral speed of the heating surface.

Any means can be used as a means for bringing the laminate or laminated sheet into close contact with the heating surface, as long as it is a method of increasing the frictional resistance between the laminate or laminated sheet and the heating surface. It doesn't matter. In this manufacturing method, since the wet paper web contains water, the heating surface and the wet paper web (laminate) are easily brought into close contact with each other. When the main fiber in the wet paper is pulp, the wet paper is well adhered to the heating surface due to the affinity of the cellulose in the pulp with the metal surface. When the main fiber is a synthetic fiber or rayon fiber, polyvinyl alcohol fiber is used as a part of the heat-adhesive fiber, and the adhesive force due to its hot water solubility allows the wet paper and the heating surface to adhere well.

As the laminate moves in close contact with the heated surface, the wet paper web dries to form a paper layer. That is, the moisture contained in the wet paper is dried, and the heat-adhesive fibers contained in the wet paper are melted, so that the main fibers in the wet paper are fused to each other. At this time, the heat-adhesive fibers contained in the wet paper are melted and fused with the splittable conjugate fibers in the dry non-woven fabric, so that the paper layer and the dry non-woven fabric are joined.
In this way, the paper layer and the dry non-woven fabric are laminated and joined to obtain a laminated sheet on the heating surface.

After the laminated sheet is obtained, it is peeled off from the heating surface. Since the laminated sheet and the heating surface are in close contact with each other and the transport speed of the laminated sheet after peeling is slower than the peripheral speed of the heating surface, it is difficult to peel the laminated sheet by simply peeling it off.
Therefore, it is general that a doctor blade is pressed between the heating surface and the paper layer to separate them with a speed difference. Then, the laminated sheet after peeling is conveyed at a peripheral speed of the heating surface, that is, a speed lower than the moving speed of the laminated sheet before peeling. As a result, due to the presence of different heat shrinkage rates of the splittable conjugate fibers in the dry nonwoven fabric during heating before peeling, shrinkage stress becomes latent, and this shrinkage stress becomes apparent by peeling from the heated surface by the doctor blade. It is considered that many wrinkles are formed on the front and back surfaces due to folding due to the difference in moving speed. Further, such folding with a doctor blade imparts bending, twisting, etc. to the splittable conjugate fiber in the dry non-woven fabric, resulting in splitting and producing ultrafine fibers composed of the polymer components A and B. Furthermore, when the splittable conjugate fiber is composed of the polymer components A and B having different heat shrinkages, the polymer components A and B cause different shrinkage due to the action of heat from the heating surface. It raises and promotes further division. When such a splittable conjugate fiber is used, the ultrafine fibers A derived from the component A are produced by the action of heat from the heating surface even after splitting.
Also, the ultrafine fibers B derived from the component B cause different shrinkage, the length of the ultrafine fibers having the smaller heat shrinkage becomes longer, and the extrafine fibers are sagged. This slack improves the bulkiness of the dry type nonwoven fabric layer, and further improves the texture.

The wiping cloth or the filtering cloth according to the present invention can be obtained by the above-mentioned method. This may be used as it is as a final product, or may be subjected to various other post-processing to obtain a final product. Also good. For example, as a post-treatment, an extension treatment or a pressure treatment may be performed to reduce the crepe structure developed during the production. By such a treatment, a large number of wrinkles on the front and back surfaces are stretched or crushed to reduce a large crepe structure, but the above-mentioned difference in shrinkage, bending and twisting of fibers by a doctor blade, and other fine wrinkles of each fiber alone. The (micro crimp) is heat set and remains as it is, and does not completely disappear. Further, as a post-process, a rubbing process may be performed to further promote the division of the split-type composite fiber that remains as undivided in the dry nonwoven fabric layer. Further, a chemical impregnation treatment such as mineral oil or a surfactant may be applied to improve the dust removal performance. As described above, the wiping cloth or filter cloth according to the present invention can be obtained with or without post-processing. In addition, the wiping cloth or filter cloth according to the present invention can be diverted to various applications as desired, such as bedding sheets (in particular, medical bed sheets), various packaging materials, and table cloths.
Although it is included in the category of wiping cloth, it can be used as a so-called wet tissue (wet wiper) by containing water or a surfactant.

[0031]

EXAMPLES Next, a method for obtaining a wiping cloth or a filtering cloth and an embodiment of the wiping cloth or the filtering cloth using the apparatus shown in FIG. 10 will be described. However, the present invention is not limited to this example.

Example 1 First, 70% by weight of wood pulp and 30% by weight of heat-adhesive fiber
And were uniformly mixed, and a paper stock was obtained by a conventional method. As the heat-adhesive fiber, the core part is polypropylene and the sheath part is ethylene-
A core-sheath type composite heat-bondable fiber made of a vinyl acetate copolymer having a fineness of 1.5 denier and a fiber length of 5 mm was used. Since the melting point of polypropylene is 167 ° C. and the melting temperature of the ethylene-vinyl acetate copolymer is 110 ° C., if heated to about 120 ° C. (heating under moist heat),
The sheath portion is softened and thermal adhesiveness is exhibited.

The paper material was made with a cylinder 2 to form a wet paper 1, which was placed on a conveyor 4 and conveyed at a speed of 100 m / min. The weight of the wet paper web 1 was 10 g / m ^{2 as} a weight after drying the water. On the other hand, a dry nonwoven fabric 9 having a basis weight of 25 g / m ² was further laminated on the wet paper 1 placed on the conveyor 4. This dry non-woven fabric 9 is a spun-bonded non-woven fabric composed of 100% by weight of splittable composite long fibers having the cross section shown in FIG. In the splittable conjugate long fiber, the polymer component A is formed of polyethylene terephthalate (melting point 257 ° C.), and the polymer component B is high-density polyethylene (melting point 13
2 ° C.) and has a fineness of 3 denier. Further, this spunbonded nonwoven fabric is a point-bonded spunbonded nonwoven fabric in which fusion-bonded areas due to melting of high-density polyethylene which is a low melting point component are partially arranged.

The laminate of the wet paper 1 and the dry non-woven fabric 9 placed on the conveyer 4 is transferred onto the felt conveyer 6, and then the wet paper 1 is brought into close contact with the heating surface of the drum dryer 7, The surface speed is transferred to the drum dryer 7 of 100 m / min. The surface temperature (temperature of the heating surface) of the drum dryer 7 is heated to 120 ° C.
As the moisture in the inside evaporates, the heat adhesive fiber softens,
Join wood pulp to each other. Further, since the heat-adhesive fibers are also present on the laminated surface with the dry non-woven fabric 9, the wood pulp and the splittable composite long fibers are combined to bond the paper layer on which the wet paper web 1 is dried and the dry non-woven fabric 9. To do. As described above, a laminated sheet in which the paper layer and the dry nonwoven fabric 9 are laminated and bonded on the surface of the drum dryer 7 is obtained. The laminate or the laminated sheet is wound and closely attached to the surface of about 3/4 of the peripheral surface of the drum dryer 7.

This laminated sheet is peeled off from the surface of the drum dryer 7 with the doctor knife 10. After being stripped off, it is conveyed at a speed lower than the surface speed (peripheral speed) of the drum dryer 7, that is, at a speed lower than the conveying speed of the laminated sheet on the drum dryer 7. Due to this speed difference, the stripped laminated sheet is
Finely with a very narrow gap between the heating surface and the doctor blade (above the point where the doctor blade contacts the heating surface, a groove with a roughly V-shaped cross section formed between the thickness of the doctor blade and the heating surface) When folded, many wrinkles are formed on the front and back surfaces. The wrinkles are generally wrinkles extending over the entire width of the laminated sheet in the width direction and are irregularly formed. Also, at the time of this folding,
The split type composite long fibers in the dry non-woven fabric 9 are subjected to heat from the drum dryer 7 and bending and twisting due to folding, so that ultrafine fibers made of polyethylene terephthalate having a fineness of 0.13 denier and fineness of 0.53 denier are obtained. It is split and split into ultrafine fibers made of high-density polyethylene.

The wiping cloth obtained as described above is one in which the paper layer and the dry non-woven fabric layer are joined and integrated,
It had a crepe structure as a whole. This wiping cloth had an enlarged surface area, a large number of projections on the front and back surfaces, and contained wood pulp in the paper layer, and thus had good water absorption. As a result of performing a wiping test to evaluate the performance as a wiping cloth, the results are shown in Table 1.

[0037]

[Table 1]

The method of the wiping test is as follows. That is, each dust (hair, talcum powder, soy sauce) was evenly spread over a wooden floor of 1 m × 0.3 m, and the wooden floor was lightly coated with the sheet obtained in each of Examples and Comparative Examples.
Wipe it back and forth. In addition, when wiping with the wiping cloth according to Examples 1 to 3, the dry non-woven fabric layer was brought into contact with the wooden floor. Then, the wiping test was evaluated depending on how much dust was removed with respect to the amount of dust initially scattered. This evaluation is [(original amount of dust on wooden floor-each amount of dust after wiping on wooden floor) / original amount of dust on wooden floor] x 100
The value obtained by the formula (%) is used, and the higher the value, the better the wiping performance.

Example 2 70% by weight of rayon fiber having a fineness of 2 denier and a fiber length of 7 mm, 3% by weight of polyvinyl alcohol fiber (wet heat adhesive fiber) having a fineness of 3 denier and a fiber length of 5 mm, fineness of 2 denier and a fiber length of 5 mm 27% by weight of the heat-adhesive fiber was uniformly mixed and a paper material was obtained by a conventional method. As the heat-bondable fiber, a core-sheath type composite heat-bondable fiber having a core made of polyethylene terephthalate and a sheath made of high-density polyethylene was used. Polyethylene terephthalate has a melting point of 257 ° C. and high-density polyethylene has a melting point of 132 ° C. Therefore, when heated to about 140 ° C., the sheath portion is melted and the thermal adhesiveness is exhibited.

The paper material was made with a cylinder 2 to form a wet paper 1, which was placed on a conveyor 4 and conveyed at a speed of 100 m / min. The weight of the wet paper 1 was 20 g / m ² after the water was dried. On the other hand, a dry non-woven fabric 9 having a basis weight of 35 g / m ² was further laminated on the wet paper 1 placed on the conveyor 4. The dry non-woven fabric 9 is a card non-woven fabric composed of 100% by weight of splittable composite short fibers having the cross section shown in FIG. The splittable conjugate short fiber has a polymer component A formed of polyethylene terephthalate (melting point 257 ° C.), a polymer component B formed of polypropylene (melting point 167 ° C.), and has a fineness of 3 denier and a fiber length of 54 mm. is there. The card nonwoven fabric is a point-bonded card nonwoven fabric in which fusion-bonded areas due to melting of polypropylene, which is a low melting point component, are partially arranged.

After that, a wiping cloth was obtained in the same manner as in Example 1. The split type composite short fibers in the card non-woven fabric are
The fibers were divided and divided into ultrafine fibers made of polyethylene terephthalate having a fineness of 0.13 denier and ultrafine fibers made of high-density polyethylene having a fineness of 0.13 denier. The wiping cloth thus obtained has a large surface area and a large number of convex portions formed on the front and back surfaces to form a crepe structure, and the paper layer contains hydrophilic rayon fibers. Therefore, it has good water absorption and can be suitably used as a wiping cloth. The result of the wiping test is
It was as shown in Table 1.

Example 3 Polyester fiber with fineness of 1.5 denier and fiber length of 7 mm
70% by weight, thermal adhesion of fineness 2 denier, fiber length 5 mm
30% by weight of organic fibers are mixed uniformly and the stock is
Obtained. The heat-bondable fibers are the same as those used in Example 1.
I used one. Using this stock, the split type of Example 1
The weight of spunbond nonwoven fabric is 30g / m ²Other than that,
A wiping cloth was obtained in the same manner as in Example 1. And this wipe
On the paper layer side of the cloth, apply 5% by weight of mineral oil based on the weight of the paper layer.
I worked.

The obtained wiping cloth had an appearance similar to that of the wiping cloth obtained in Example 1, except that the types of main fibers and heat-adhesive fibers in the paper layer were different. This wiping cloth has a crepe structure in which the surface area is enlarged and a large number of protrusions are formed on the front and back surfaces, and the paper layer is coated with mineral oil, so it is made of fine powders. The dust could be wiped off well. The result of the wiping test was as shown in Table 1.

Example 4 75% by weight of latently crimpable polyester fiber having a fineness of 2 denier and a fiber length of 7 mm, 23% by weight of heat-bondable fiber having a fineness of 2 denier and a fiber length of 5 mm, fineness of 3 denier and fiber length of 5
mm polyvinyl alcohol fiber (wet heat adhesive fiber) 2
% By weight were uniformly mixed and a paper stock was obtained by a conventional method. As the latently crimpable polyester fiber, a composite fiber in which a polyethylene terephthalate component having a high hot water shrinkage ratio and a cationic dyeable polyester component having a low hot water shrinkage ratio were side-by-side composited was used. The core of the heat-bondable fiber is polyethylene terephthalate, and the sheath has a melting point of 110.
A core-sheath type composite heat-adhesive fiber made of modified polyethylene terephthalate at ℃ was used.

Using this stock material, the wet paper 1 was weighed to a dry weight of 30 g / m ^2, and
In addition, the weight of the split type spunbonded nonwoven fabric of Example 1 is set to 30.
A filter cloth was obtained in the same manner as in Example 1 except that g / m ² was used. In the case of this method, at the stage of drying the wet paper web 1,
Crimp develops in the latently crimpable polyester fibers in the wet paper 1. Therefore, the basis weight and appearance of the obtained filter cloth were different from those of the wiping cloth according to Example 1. This filter cloth has an enlarged surface area, the paper layer is bulky and coarse due to the presence of crimped fibers, and the dry non-woven fabric layer is due to the presence of ultrafine fibers generated by the division of the splittable composite long fibers. Since it is dense, it is suitable as a filter cloth. That is, after relatively large dust is filtered through the paper layer in advance, relatively fine dust can be filtered through the dry non-woven fabric layer, so that the dry non-woven fabric layer is less likely to be clogged and has a long life as a filtration fabric. .

Comparative Example 1 Polyester short fibers having a fineness of about 3 denier and a fiber length of about 54 mm are accumulated, and the polyester short fibers are entangled with each other by water needling.
A wiping test was conducted using a dry non-woven fabric of 0 g / m ² . The results are as shown in Table 1. In addition,
The non-woven fabric surface was coated with an oil agent at a rate of ² g / m ² .

Comparative Example 2 A wipe-off test was conducted using a melt-blown non-woven fabric having a basis weight of 45 g / m ² on which polypropylene ultrafine fibers obtained by the melt-blown method were accumulated, and the results are shown in Table 1. The fineness of the polypropylene ultrafine fibers was about 0.1 denier.

As is clear from the results of Table 1, Example 1
The wipes according to Nos. 3 to 3 had satisfactory performances in hair removability, talcum powder removability, and soy sauce removability as compared with the non-woven fabrics according to Comparative Examples 1 and 2. In addition, the talcum powder used the general thing used as one component of cosmetics.

[0049]

EFFECT OF THE INVENTION The wiping cloth or filter cloth according to the present invention comprises a dry non-woven fabric layer composed mainly of ultrafine fibers, and a paper layer composed of arbitrary main fibers and heat-adhesive fibers. Yes, and many wrinkles are formed on the front and back,
It has a crepe structure. Therefore, it is possible to exhibit both the dust removal performance by the dry non-woven fabric layer and the dust removal performance by the paper layer, and the presence of wrinkles on the surface further enhances the dust removal performance and the dust capture performance. Therefore, it can be suitably used as a wiping cloth or a filter cloth.

Further, when wood pulp, rayon fiber or the like having excellent water absorption is adopted as the main fiber, a wiping cloth having good water absorption can be obtained. When an oil agent such as mineral oil is applied to the paper layer, a wiping cloth having further improved oil and powdery dust removing performance can be obtained. Further, when crimped fibers are used as the main fibers, the paper layer can be a bulky and rough layer, and the presence of a fine dry nonwoven fabric layer composed of ultrafine fibers and the presence of wrinkles on the front and back surfaces. In combination with the above, it can also be suitably used as a filter cloth.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a splittable conjugate fiber used in the present invention.

FIG. 2 is a cross-sectional view showing an example of the splittable conjugate fiber used in the present invention.

FIG. 3 is a cross-sectional view showing an example of the splittable conjugate fiber used in the present invention.

FIG. 4 is a cross-sectional view showing an example of the splittable conjugate fiber used in the present invention.

FIG. 5 is a cross-sectional view showing an example of the splittable conjugate fiber used in the present invention.

FIG. 6 is a cross-sectional view showing an example of the splittable conjugate fiber used in the present invention.

FIG. 7 is a cross-sectional view showing an example of the splittable conjugate fiber used in the present invention.

FIG. 8 is a cross-sectional view showing an example of the splittable conjugate fiber used in the present invention.

9 is a cross-sectional view showing a state in which the splittable conjugate fiber shown in FIG. 3 is split.

FIG. 10 is a schematic view showing an example of an apparatus for obtaining a wiping cloth or filter cloth according to the present invention.

[Explanation of symbols]

1 wet paper 7 drum dryer 9 Dry non-woven fabric 10 doctor blade

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 39/18 B01D 39/18 B32B 5/26 B32B 5/26 D04H 1/42 D04H 1/42 X D21H 27/30 D21H 27/30 A (72) Inventor Masaki Ichiro 233-3 Egawa, Ino-cho, Agawa-gun, Kochi (72) Inventor Hiroshi Mizutani 10-23, Yachiyodai West, Yachiyodai, Yachiyo City, Chiba Prefecture (72) Isamu Yamamoto Kyoto Prefecture 1-13 13-1, Biwadai, Uji City (72) Inventor Hiko Takabe 20-3 Jobanhei Futabacho, Matsudo City, Chiba Prefecture (72) Inventor Yutaka Matsuyama 177 Korokudai, Matsudo City, Chiba Prefecture (72) Kunio Suzuki 212-10 F term (3-10-10 Nakamachi, Musashino-shi, Tokyo) (reference) 3B074 AA01 AA02 AA04 AA08 AB01 AC03 4D019 AA01 BA12 BA13 BB03 BB05 BB10 BC13 BD03 DA01 DA02 DA04 DA05 DA06 4F100 DG05 4B100 DG68B19A18A01 EC03 EC03A GB56 GB71 JD14 JK14 4L047 AA08 AA12 AA14 AA21 AA23 AA27 AA28 AB02 AB08 BA09 BB01 BB03 BB09 CA05 CA18 CB 07 CB08 CB10 CC12 CC16 4L055 AF09 AF10 AF16 AF17 AF21 AF33 AF39 AF46 AF47 AJ06 BE14 BE20 FA20 FA30 GA26 GA31 GA39 GA46 GA50

Claims (3)

[Claims] 1. A paper layer and a dry non-woven fabric layer are laminated and joined, and the paper layer is composed of main fibers bonded by fusion of thermo-adhesive fibers, and the dry non-woven fabric layer is divided into splittable conjugate fibers. The paper layer and the dry non-woven fabric layer are bonded and integrated by fusion bonding of the heat-adhesive fiber, and the whole has a crepe structure. Characteristic wipe or filter cloth. 2. A fiber produced by splitting a splittable conjugate fiber.
The ultrafine fibers B of one kind among the ultrafine fibers A and B of one kind have a length longer than the length of the other ultrafine fibers A of one kind, and the extrafine fibers B have slack. A wipe or filter cloth. 3. The wiping cloth or filter cloth according to claim 1, wherein the main fiber is a hydrophobic crimped fiber.