JP3289309B2 - Sheet-like wiping cloth and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like wiping cloth used as a disposable hand wipe, a wet tissue, a wiper, a disposable rag and the like, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a wiping cloth for disposable hand wiping or the like, a dry pulp sheet in which pulp fibers are accumulated in a bulky manner, which is impregnated with water, a chemical or the like, has been used. However, the dry pulp sheet has a drawback that the wet strength after being impregnated with water or chemicals is low, and the sheet is easily broken during use.

[0003] On the other hand, a nonwoven fabric obtained by accumulating rayon fibers, which are hydrophilic fibers, and then bonding the rayon fibers together with a rubber-based binder is impregnated with water or the like. This wiping cloth exhibits high wet strength since the rayon fibers are bonded to each other. However, since the wiping cloth contains a rubber-based binder, there is a drawback that an odor is generated. In addition, there is also a disadvantage that the feeling of use of the wiping cloth is poor due to the rough touch of the rubber-based binder. For this reason, attempts have been made to use a nonwoven fabric in which rayon fibers are entangled without using a rubber-based binder. For the entanglement between the rayon fibers, it is conceivable to apply a water column flow to the web on which the rayon fibers are accumulated. However, in order to sufficiently impart entanglement due to the water column flow, the amount of accumulated rayon fibers must be large. In other words, in a web in which the amount of rayon fibers accumulated is small, relatively large gaps are formed between the rayon fibers, and even when a water column flow is applied, the water column flow does not collide with the rayon fibers and easily passes through the gap. Slip through the web. That is, since the kinetic energy is not sufficiently given to the rayon fiber, the rayon fiber does not sufficiently move, and as a result, the rayon fibers do not entangle with each other.

Therefore, if the rayon fibers are to be sufficiently entangled with each other, the amount of the rayon fibers accumulated is increased,
It is necessary to reduce the fiber gap formed between the rayon fibers. However, when the accumulation amount of rayon fibers is increased, the thickness of the obtained wiping cloth is increased, and not only the touch feeling is deteriorated, but also the cost is significantly increased. In addition, when used as a wiping cloth, the following fatal defects may be caused. That is, dust is adhered to the wiping cloth after use, and the dust is captured in the fiber gap between the rayon fibers.
Therefore, when the fiber gap between the rayon fibers is reduced, it may be difficult to remove the dust even if the wiping cloth is washed with water. That is, there is a drawback that it becomes difficult to wash the wiping cloth with water and reuse it.

[0005]

For this reason, the applicant of the present application has studied a technique in which the amount of rayon fibers or the like accumulated at least can be entangled by a water column flow. As a result, they came to the conclusion that it is effective to close relatively large gaps between rayon fibers in a web in which rayon fibers and the like are accumulated, and proposed the invention according to Japanese Patent Application No. 3-204875. did. The present invention relates to a method for producing a wiping cloth, comprising laminating thin paper on a surface of a web on which long fibers such as rayon long fibers are accumulated, and applying a high-pressure water column flow. By this method, the pulp fiber and the long fiber constituting the tissue paper are well entangled with each other, and the long fibers are also well entangled with each other via the pulp fiber, so that a wiping cloth having good water absorption and high wet strength can be obtained. You get it.

In applying the water column flow, a porous support is used as a material for mounting the laminate of the long fiber web and the tissue paper, or mechanical means are applied after the water column flow is applied. By doing so,
With a specific opening, when washing with water after using the wipe,
The water is satisfactorily circulated through the openings, and the dust trapped in the fiber gap is easily removed by washing with water, thereby providing a wiping cloth suitable for repeated reuse. Further, when the wiping cloth is wetted with water or a chemical and rubbed strongly, the above-described scratching effect of the minute opening portion, that is, a physical dirt removal effect is exhibited, and a dirt that is difficult to remove with a wiping cloth having no opening is easily achieved. To make it possible to drop This is possible only when the wiping cloth has excellent strength even in a wet state, so that the wiping cloth does not break even if it is strongly rubbed, and that there are minute openings on the surface of the wiping cloth. In addition, due to the large number of minute holes, it has a beautiful gauze-like appearance or feeling,
It is intended to have flexibility as well.

[0007]

That is, the present invention provides a sheet comprising a number of long fibers and pulp fibers accumulated (however,
Contains no staple fibers. ) Wherein the long fibers and the pulp fibers are entangled with each other, and both the long fibers and the pulp fibers are unevenly distributed in the sheet, so that the long fibers and the pulp fibers are substantially A sheet-shaped sheet having a large number of openings in which pulp fibers do not exist, the area of one opening is 0.01 to ⁴ mm ² , and the number of openings is 6 to 600 per cm ^2. The present invention relates to a wiping cloth and a method for manufacturing the same.

[0008] The sheet-like wiping cloth according to the present invention is formed by accumulating a large number of long fibers and a large number of pulp fibers. As long fibers, any conventionally known long fibers can be used. For example, rayon long fibers, polyamide long fibers such as nylon, polyacrylate long fibers, polyolefin long fibers such as polypropylene and polyethylene, polyester long fibers such as polyethylene terephthalate, etc. are used alone or in combination. can do. In the present invention, the reason for using long fibers is that long fibers are more excellent in tensile strength and form stability when entangled between fibers than short fibers. The fineness of the long fiber is preferably 1 to 4 denier. When the fineness of the long fiber exceeds 4 denier, the bending rigidity of the long fiber increases, and the feeling in use when used as a wiping cloth tends to decrease. Conversely, if the fineness of the long fiber is less than 1 denier, the manufacturing conditions and the like for the long fiber become strict, making it difficult to manufacture the long fiber at high speed, which is not practical.

As the pulp fibers used in the present invention, conventionally known pulp fibers can be used arbitrarily. For example, unbleached pulp or bleached pulp obtained by digesting softwood and hardwood wood by a kraft method, a sulfite method, a soda method, a polysulfide method, or the like, or a mechanical pulp such as a ground pulp or a thermomechanical pulp, alone or in combination. Can be used.

[0010] The intertwining of the long fibers and the pulp fibers is performed by applying a water column flow to a laminate in which a long fiber web in which the long fibers are accumulated and a paper sheet in which the pulp fibers are accumulated. Done. It is preferable to use a long fiber web having a basis weight of 5 to 30 g / m ² . If the basis weight of the long-fiber web exceeds 30 g / m ² , the pulp constituting the paper sheet can be applied to the laminate of the paper sheet and the long-fiber web even if a water column flow is applied from the paper sheet to the long-fiber web side. The fibers are less likely to move to the back side of the long fiber web (the side not in contact with the paper sheet), and the pulp fibers are unevenly distributed only on one side of the obtained wiping cloth. Tends to decrease. Conversely, if the basis weight of the long-fiber web is less than 5 g / m ² , the morphological stability of the long-fiber web tends to decrease, and the wet strength of the obtained wiping cloth tends to decrease. Further, the gap between the long fibers becomes large, and when a high-pressure water column flow is applied, pulp fibers flow out from the gap, which tends to hinder the effective use of pulp fibers. The long-fiber web used in the present invention may be a so-called long-fiber nonwoven fabric in which the long fibers are self-fused, or a fleece long-fiber fleece in which the long fibers are not bonded to each other. There may be. In particular, among the former long-fiber nonwoven fabrics, it is preferable to use one in which a large number of spot fusion areas in which self-fusion between long fibers are self-fused are arranged in scattered points. The reason is that there is a point fusion area where the long fibers are self-fused, so that the shape stability is excellent, and in the area other than the point fusion area, the long fibers are self-fused. It is highly flexible because it is integrated in a free state,
Also, it is easily entangled with the pulp fiber.

The basis weight of the paper sheet on which the pulp fibers are accumulated is preferably about 10 to 100 g / m ^{2 as} measured by the method described in JIS P8124. When the basis weight of the paper sheet is less than 10 g / m ² , the absolute amount of the pulp fiber is small, and it tends to be difficult to provide the obtained wiping cloth with sufficient water absorption and water retention. Conversely, if the basis weight of the paper sheet exceeds 100 g / m ² , the absolute amount of pulp fibers is too large, and even if a water column flow is applied to the paper sheet, individual pulp fibers may become entangled with long fibers. There is a tendency that it is difficult to give a degree of momentum. Furthermore, the absolute amount of pulp fibers is too large, and the resulting wipes tend to be less flexible. In addition, in the case of using a water column flow and a porous support made of a woven fabric to form an opening in the obtained wiping cloth,
If the basis weight of the paper sheet is too heavy, there is a tendency that holes are less likely to occur.

The weight ratio of softwood pulp to hardwood pulp as the pulp raw material constituting the paper sheet is preferably softwood pulp: hardwood pulp = 100-20: 0-80, and especially 10
The range of 0 to 40: 0 to 60 is most preferred. 80 hardwood pulp
When the amount exceeds the weight percentage, not only the outflow of pulp due to the water column flow increases, but also the flexibility of the entangled sheet tends to decrease. The JI of the paper sheet used in the present invention
The density measured by the method described in SP 8118 is 0.6 g / cm ³
Or less, and most preferably 0.55 g / cm ³ or less. When the density exceeds 0.6 g / cm ³ , the movement of the pulp fiber is suppressed when a water column flow is applied from above the paper sheet, and the amount of energy required for entanglement tends to increase.

The long-fiber web and the paper sheet described above are laminated to form a laminate. In this laminate,
The basis weight ratio of the long fiber web to the paper sheet is the long fiber web:
It is preferable that paper sheet = 1: 1 to 19.
When the ratio of long fiber web: paper sheet is less than 1: 1, the amount of pulp fibers is relatively small relative to the amount of long fibers, and the water absorption and water retention of the obtained wiping cloth tend to decrease. In addition, as the amount of inexpensive pulp fibers is reduced with respect to long fibers, the obtained wiping cloth itself tends to be expensive. Conversely, if the basis weight of the paper sheet exceeds 1:19 and the basis weight of the paper sheet exceeds 1:19, all of the pulp fibers constituting the paper sheet hardly become entangled with the long fiber, and the obtained wiping is obtained. When the cloth is used wet, the pulp fiber tends to fall off.

Next, a water column flow is applied to the laminate. This water column flow is obtained by ejecting water at high pressure through a nozzle hole having a fine diameter. For example, pore size 0.01-0.3m
It is obtained by ejecting water at a pressure of about ²⁰ to 150 kg / cm ² through a nozzle hole of about m. When this water column flow is applied to the laminate, the water column flow collides with the laminate, causing movement of the long fibers constituting the long fiber web and the pulp fibers constituting the paper sheet in the laminate. That is, the paper sheet is broken, the pulp fibers constituting the paper sheet are isolated, the pulp fibers are deformed such as bending and torsion, and the pulp fibers are given sufficient kinetic energy, and the pulp fibers are randomized. Cause great movement. As a result, the pulp fibers and the long fibers in the long fiber web are entangled by these combined actions, and the long fibers are also entangled by the pulp fibers.

When applying the water column flow, if the laminate is placed on a woven porous support, the pulp fibers and the long fibers are entangled, and the pulp fibers and the long fibers are entangled. Both the fibers and the fibers are unevenly distributed in the plane direction, and as a result, holes are formed.
The opening area or the number of openings is regulated to some extent by the kind of the porous support made of textile used. As the porous support made of a woven fabric, a woven fabric woven using thin filaments made of stainless steel, plastic, or the like, and a woven fabric woven with a woven structure such as plain weave, satin weave, or twill weave is used. Is preferred. The density of the filament is 3 to 30 filaments /
cm is preferable.

In the present invention, as described above, the woven fabric
Most preferably, the pulp fibers and the long fibers are entangled with the porous support and the water column flow, and the pores are formed. However, the pulp fiber and the long fiber are entangled with each other by using another porous support or a non- porous support , or by applying a water column flow to the laminate without the support, and this entanglement is completed. After that, openings may be generated. Specifically, an opening may be created by penetrating a needle into the laminated body after the entanglement is completed, or by partially cutting off the part with a push-off tool.

The wiping cloth according to the present invention is manufactured as described above, and has an opening substantially free of both pulp fibers and long fibers. And
In the present invention, the area of one opening is 0.01 to ⁴ mm ² . If the area of one of the apertures is less than 0.01 mm ^2,
Even if the used wiping cloth is washed with water, it is not preferable because water hardly circulates in the thickness direction through the openings, and it is difficult to remove dust trapped in the openings and fiber gaps. Conversely, if the area of the opening exceeds 4 mm ² , the opening is too large to catch dust, and when used as a wiping cloth, it is difficult to remove dust, which is not preferable. Further, since it is difficult to hold water at the opening, the water absorption and water retention of the wiping cloth decrease, which is not preferable.

The number of openings present in the wiping cloth according to the present invention is 6 to 600 / cm ² , preferably 9 to 300 / cm ² . If the number of openings is less than 6 / cm ^{2, the} number of openings provided in the wipe is too small, and even if the used wipe is washed with water,
It is not preferable because the amount of water flowing in the thickness direction is small, and dust trapped at the opening edge or the fiber gap comes to be removed. On the other hand, if the number of apertures is small, the effect of removing dirt due to the edge of the aperture decreases, and the feeling of the wiping cloth tends to decrease. It is difficult to make the number of apertures more than 600 / cm ² in production, and even if it can be produced, it is difficult to make the aperture area 0.01 mm ² or more.

The openings described above may be provided in the wiper in a fixed pattern, or may be provided completely randomly. In general, it is preferable to provide them in a fixed pattern because they exhibit a gauze-like appearance. Further, the feel and flexibility of the wiping cloth are uniform over the whole, which is preferable. The wiping cloth obtained as described above is used as it is or, if desired, a wetting agent such as water or propylene glycol; an antibacterial agent such as alcohols or parabenzoic acid; a fungicide such as a fungicide; Is given, disposable hand towel, wet tissue,
They are used as wipers and disposable rags.

[0020]

Example 1 A long-fiber nonwoven fabric having a large number of spot-fused areas in which polypropylene long fibers are accumulated and self-fused between the polypropylene long fibers was prepared. The fineness of the long fibers constituting the long-fiber nonwoven fabric was 2.5 denier, and the basis weight of the long-fiber nonwoven fabric was 15 g / m ² . A paper sheet containing no fibers other than pulp fibers was laminated on the surface of the long-fiber nonwoven fabric. This paper sheet has a basis weight of 30 g / m ² measured by the method shown in JIS P 8124, and
The density measured by the method indicated by 8 was 0.28 g / cm ³ . This paper sheet was obtained by wet-making paper from bleached softwood kraft pulp. And the paper sheet is located on the top, the long fiber nonwoven fabric is located on the bottom,
It was placed on a transfer conveyor. In this transfer conveyor, stainless steel filaments were woven in a plain weave structure, and the filament density was 16 filaments / cm in both the warp and weft directions. Then, while transferring the transfer conveyor at a speed of 30 m / min, using a water column jetting device in which nozzle holes having a hole diameter of 0.1 mm are arranged at intervals of 16 holes / cm, 50 kg was used.
A water column flow was ejected at a water pressure of / cm ² to apply a water column flow to the surface of the paper sheet. Then, the water column flow was discharged from the back of the transfer conveyor. As described above, the pulp fibers constituting the paper sheet and the long fibers constituting the long-fiber nonwoven fabric were entangled to obtain an integrated wiping cloth. Resulting in the wiping cloth, and oval-shaped openings of 0.1~0.2mm ² 0.02~0.1mm
^Two oval openings were alternately arranged in the meridian and weft directions, eight at a time per cm. And this opening is 1c
There were a total of 16 holes per m (256 holes / cm ² ), and the appearance was beautiful gauze-like.

Example 2 A long-fiber nonwoven fabric was prepared in which polypropylene long fibers were accumulated and had many point-fusion areas where the polypropylene long fibers were self-fused. The fineness of the long fibers constituting the long-fiber nonwoven fabric was 1.5 denier, and the basis weight of the long-fiber nonwoven fabric was 20 g / m ² . A paper sheet containing no fibers other than pulp fibers was laminated on the surface of the long-fiber nonwoven fabric. This paper sheet has a basis weight of 80 g / m ² measured by the method shown in JIS P 8124, and
The density measured by the method indicated by 8 was 0.50 g / cm ³ . This paper sheet was obtained by wet-making paper from bleached softwood kraft pulp. And the paper sheet is located on the top, the long fiber nonwoven fabric is located on the bottom,
It was placed on a transfer conveyor. After that, the water pressure of the water column
A wiping cloth was obtained in the same manner as in Example 1 except that the weight was 0 kg / cm ² . Resulting in the wiping cloth, oval apertures and 0.02 to 0.2 mm ² of the oblong apertures and are each eight increments per 1cm alternately 0.05 to 0.3 mm ^2, in the warp direction and the weft direction It was lined up. And there are a total of 16 holes per cm (the number of holes is 256 /
cm ² ) and had a beautiful gauze-like appearance.

Example 3 Polyethylene terephthalate long fibers were accumulated,
In addition, a long-fiber nonwoven fabric having a large number of point-fusion areas where the polyethylene terephthalate long fibers were self-fused was prepared. The fineness of the long fibers constituting this long-fiber nonwoven fabric is 2.
It was 3 denier, and the basis weight of the long-fiber nonwoven fabric was 20 g / m ² . A paper sheet containing no fibers other than pulp fibers was laminated on the surface of the long-fiber nonwoven fabric. This paper sheet has a basis weight of 30 g measured by the method shown in JIS P 8124.
/ M ² , and the density measured by the method described in JIS P 8118 was 0.42 g / cm ³ . This paper sheet was obtained by wet-making paper from bleached softwood kraft pulp. Then, the paper sheet was placed on the transfer conveyor such that the paper sheet was positioned on the upper side and the long-fiber nonwoven fabric was positioned on the lower side. In this transfer conveyor, stainless steel filaments were woven in a plain weave structure, and the filament density was 8 filaments / cm in both the warp direction and the weft direction. Next, while transferring this transfer conveyor at a speed of 30 m / min, the hole diameter was set to 0.
A water column flow was jetted at a water pressure of 80 kg / cm ² using a water column jet device having 15 mm nozzle holes arranged at 1 mm intervals, and a water column flow was applied to the surface of the paper sheet. Then, the water column flow was discharged from the back of the transfer conveyor. As described above, the pulp fibers constituting the paper sheet and the long fibers constituting the long-fiber nonwoven fabric were entangled to obtain an integrated wiping cloth. The obtained wiping cloth had 0.1 to ² mm ² oval openings, the number of which was 64 / cm ² , and exhibited a beautiful gauze-like appearance.

Example 4 A long-fiber non-woven fabric was prepared in which polypropylene long fibers were accumulated and had many point-fusion areas where the polypropylene long fibers were self-fused. The fineness of the long fibers constituting the long-fiber nonwoven fabric was 3.3 denier, and the basis weight of the long-fiber nonwoven fabric was 20 g / m ² . A paper sheet containing no fibers other than pulp fibers was laminated on the surface of the long-fiber nonwoven fabric. This paper sheet has a basis weight of 35 g / m ² measured by the method shown in JIS P 8124, and
Density measured in the manner shown in 8 was 0.36 g / cm ^3. This paper sheet is made of softwood bleached kraft pulp 90
% And a mixture of hardwood bleached kraft pulp obtained by wet papermaking. Then, the paper sheet was placed on the transfer conveyor such that the paper sheet was positioned on the upper side and the long-fiber nonwoven fabric was positioned on the lower side. In this transfer conveyor, stainless steel filaments were woven in a plain weave structure, and the filament density was 4 filaments / cm in both the warp direction and the weft direction. Next, while transferring the transfer conveyor at a speed of 30 m / min, the water column was jetted at a water pressure of 80 kg / cm ² using a water column jetting device in which nozzle holes having a hole diameter of 0.15 mm were arranged at an interval of 10 / cm. The stream was jetted, and a water column flow was applied to the surface of the paper sheet. Then, the water column flow was discharged from the back of the transfer conveyor. As described above, the pulp fibers constituting the paper sheet and the long fibers constituting the long-fiber nonwoven fabric were entangled to obtain an integrated wiping cloth. The obtained wipe had oval openings of 0.05 to ³ mm ² , the number of which was 16 / cm ² , and exhibited a beautiful gauze-like appearance.

Example 5 A long-fiber nonwoven fabric was prepared in which polypropylene long fibers were accumulated and had many point-fused areas where the polypropylene long fibers were self-fused. The fineness of the long fibers constituting the long-fiber nonwoven fabric was 2.5 denier, and the basis weight of the long-fiber nonwoven fabric was 12 g / m ² . A paper towel (manufactured by Oji Paper Co., Ltd.) containing no fibers other than wood pulp was laminated on the surface of the long-fiber nonwoven fabric.
This paper towel had a basis weight of 22 g / m ² measured by the method shown in JIS P 8124. This paper towel was obtained by wet papermaking of a mixture of bleached kraft pulp of softwood 60% and bleached kraft pulp of hardwood 40%, and was provided with fine crepe. Then, the paper towel was positioned on the upper side and the long-fiber nonwoven fabric was positioned on the lower side, and was placed on the transfer conveyor. In this transfer conveyor, plastic filaments were woven in a plain weave structure, and the filament density was 11 filaments / cm in both the warp direction and the weft direction. Then, while moving the transfer conveyor at a speed of 30 m / min, a water column with a water pressure of 40 kg / cm ² was used by using a water column flow jetting device in which nozzle holes having a hole diameter of 0.1 mm were arranged at intervals of 16 holes / cm. A stream was spouted out and a water column was applied to the surface of the paper towel. Then, the water column flow was discharged from the back of the transfer conveyor. As described above, the pulp fibers constituting the paper towel and the long fibers constituting the long-fiber nonwoven fabric were entangled to obtain an integrated wiping cloth. The obtained wiping cloth has an opening area of 0.02 to
There is an opening of 0.8 mm ² , and the number is 121 / c.
m ^2, and has an appearance of beautiful gauze tone.

Comparative Example 1 The paper sheet used in Example 1 was placed on the upper side, and the long-fiber nonwoven fabric used in Example 1 was placed on the lower side of the transfer conveyor. This transfer conveyor has stainless steel filaments woven in a plain weave structure,
The filament density is 40 filaments / cm in both the warp and weft directions.
Met. Next, while transferring the transfer conveyor at a speed of 30 m / min, a water column flow is jetted at a water pressure of 60 kg / cm ² using a water column jet device in which nozzle holes having a diameter of 0.1 mm are arranged at intervals of 0.4 mm. A water column flow was applied to the surface of the paper sheet. Then, the water column flow was discharged from the back of the transfer conveyor. As described above, the pulp fibers constituting the paper sheet and the long fibers constituting the long-fiber nonwoven fabric were entangled to obtain an integrated wiping cloth. The obtained wiping cloth had no opening of 0.01 mm ² or more, had a flat surface state, and did not exhibit a gauze-like appearance. Further, the flexibility was inferior to the wiping cloth obtained in Example 1.

Comparative Example 2 The paper sheet used in Example 1 was placed on the upper side, and the long-fiber nonwoven fabric used in Example 1 was placed on the lower side of the conveyor. This transfer conveyor has stainless steel filaments woven in a plain weave structure,
The filament density is 2 filaments / cm in both the warp and weft directions.
Met. Next, while transferring the transfer conveyor at a speed of 30 m / min, a water column flow was jetted at a water pressure of 60 kg / cm ² using a water column jet device in which nozzle holes having a diameter of 0.2 mm are arranged at 1 mm intervals. A water column flow was applied to the surface of the paper sheet.
Then, the water column flow was discharged from the back of the transfer conveyor. As described above, the pulp fibers constituting the paper sheet and the long fibers constituting the long-fiber nonwoven fabric were entangled to obtain an integrated wiping cloth. In the obtained wipe,
The number of apertures exceeded about 6 mm ^2, and the number of apertures was 4 / cm ² , giving a rough touch, which was significantly different from the gauze-like appearance.

Comparative Example 3 A long-fiber nonwoven fabric was prepared in which polypropylene long fibers were accumulated and had many point-fusion areas where the polypropylene long fibers were self-fused. The fineness of the long fibers constituting the long-fiber nonwoven fabric was 2.5 denier, and the basis weight of the long-fiber nonwoven fabric was 30 g / m ² . A paper sheet containing no fibers other than pulp fibers was laminated on the surface of the long-fiber nonwoven fabric. This paper sheet had a basis weight of 20 g / m ^{2 as} measured by the method shown in JIS P 8124. In addition,
This paper sheet is obtained by wet papermaking of bleached softwood kraft pulp. Then, the paper sheet was placed on the transfer conveyor such that the paper sheet was positioned on the upper side and the long-fiber nonwoven fabric was positioned on the lower side. Then, using the same transfer conveyor as used in Comparative Example 1, a wiping cloth was obtained in the same manner as in Comparative Example 1. The obtained wiping cloth had no opening of 0.01 mm ² or more, had a flat surface state, and did not exhibit a gauze-like appearance.

Comparative Example 4 The long-fiber nonwoven fabric used in Example 1 was used as a wipe. This wiper was inferior in water absorbency and water retention, and could not be used in a wet state like a wet tissue.

Comparative Example 5 The paper sheet used in Example 1 was directly used as a wiping cloth.
Although this wiping cloth was excellent in water absorbency, it was easily broken when rubbed in a wet state and could not be put to practical use.

The wipes according to Examples 1 to 5 and Comparative Examples 1 to 5 were subjected to the following tests to evaluate the quality. The results are shown in Table 1.

[Table 1] Note 1) Gauze-like appearance: The appearance of the wiping cloth was sensory and evaluated as follows. …: Gauze appearance, ×: No gauze appearance. 2) Flexibility: The flexibility of the wipe was evaluated organoleptically. The sensory evaluation was performed in the following five stages. 5: Extremely flexible, 4: Excellent flexibility, 3: Normal flexibility, 2: Inferior flexibility, 1: Inferior flexibility. 3) Water absorption: The water absorption of the wipe was determined by sensory evaluation. The sensory evaluation was performed in the following five stages. 5: Water was absorbed very quickly. 4: Water was immediately absorbed. 3 ...
Water absorption was normal. 2: Water was absorbed slightly slowly. 1: Slowly absorbed water. 4) Water retention: After the wiping cloth is immersed in water for 30 seconds, removed from the water, sandwiched between filter papers, pressed and held at a load of 5 g / m ² for 30 seconds, and after removing water on the surface, The following formula was used to evaluate water retention. Water retention (%) = [(weight of wipe after treatment-
Weight of wipe before treatment) / weight of wipe before treatment] x 10
It is 0. 5) Wiping property: After immersing the wiping cloth in water, the desk was rubbed while being squeezed lightly, and the wiping property and the strength of the wiping cloth were evaluated organoleptically. The sensory evaluation was performed in the following five stages. 5: Extremely excellent wiping properties and little decrease in strength. 4: Excellent wiping properties and little decrease in strength. 3: Both wiping properties and strength reduction were normal. 2: The wiping properties were slightly poor, and the strength was slightly reduced. 1 ... Wipeability was poor and strength was drastically reduced. 6) Repeatability: The operation of immersing the wiping cloth in water, squeezing it gently, and then rubbing it by hand was repeated, and evaluated organoleptically. The sensory evaluation was performed in the following five stages. 5: The strength of the wiping cloth was hardly reduced, and it could be used sufficiently repeatedly. 4: Although the strength of the wipe was slightly reduced, it could be used repeatedly. 3: The strength of the wipe has decreased,
It was able to withstand repeated use several times. 2: The strength of the wiping cloth was reduced, and it could not be said that it could be used repeatedly. 1
... The strength of the wipe was drastically reduced and repeated use was impossible.

As is clear from the results in Table 1, Examples 1 to
Compared with the wiping cloth according to No. 5, the wiping cloths according to Comparative Examples 1 and 3 did not have openings of a certain size, and thus were inferior in flexibility and wiping properties. Further, since the wiping cloth according to Comparative Example 2 had a very large opening, it was inferior in water absorbency and water retention and poor in wiping properties. Furthermore, the wiping cloth according to Comparative Example 4 had almost no water absorption or water retention and could not be used as a wiping cloth.
The wipe according to Comparative Example 5 could not be used repeatedly.

[0032]

As described above, since the wiping cloth according to the present invention has a certain number of openings of a certain size, water can be absorbed and held by these openings. It is excellent in water absorption and water retention. Therefore, the object to be cleaned can be washed by applying water or other chemicals to the wiping cloth, and the cleaning effect of the chemicals can be sufficiently exhibited.
In addition, the object to be cleaned can be rubbed at the opening edge, and the dust adheres to the opening edge, so that the dust can be easily removed. Furthermore, dust adhering to the opening edge, fiber gap, etc.
When the wiping cloth is washed with water, the wiping cloth is easily removed by water passing through the opening, and dust adhered to the wiping cloth is easily removed from the used wiping cloth, so that the wiping cloth can be reused many times.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-268936 (JP, A) JP-A-3-504622 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47L 13/16 D04H 5/02 D21H 13/10

Claims (2)

(57) [Claims] 1. A sheet (not including staple fibers) in which a number of long fibers and pulp fibers are accumulated, wherein said long fibers and said pulp fibers are entangled with each other, and Both the long fiber and the pulp fiber are unevenly distributed in the sheet, so that the long fiber and the pulp fiber have a large number of openings substantially free of the long fiber and the pulp fiber,
A sheet-like wiping cloth characterized in that one opening has an area of 0.01 to ⁴ mm ² and the number of openings is 6 to 600 per 1 cm ² . 2. A laminate obtained by laminating a long fiber web formed by accumulating a large number of long fibers and a paper sheet constituted by a large number of pulp fibers is placed on a porous support made of woven fabric. The method for producing a sheet-like wiping cloth according to claim 1, wherein a water column flow is applied so as to penetrate from the upper surface of the laminate to the back surface of the porous support made of fabric .