JPH05286100A - Manufacture of wiping cloth - Google Patents

Abstract

PURPOSE:To provide the manufacture of wiping cloth enabling continuous operation for a prolonged term. CONSTITUTION:A paper sheet is laminated on the surface of a long-fiber nonwoven fabric. A high-pressure water column flow is flowed through the laminate so as to be penetrated from the paper sheet side to the long-fiber nonwoven fabric side. Pulp fibers constituting the paper sheet and long fibers organizing the long-fiber nonwoven fabric are interlocked by the action of the high-pressure water column flow. A nonwoven fabric, in which a large number of point fusion zones, in which autohesion is conducted among mutual long fibers, are arranged at intervals, is used as the long-fiber nonwoven fabric at that time. Each area of the point fusion zone occupies 0.01-4mm<2>. The gross areas of the point fusion zones occupy 2-20 area % to the surface area of the long-fiber nonwoven fabric. Since there is the point fusion zones in the long-fiber nonwoven fabric, long fibers are fixed, no large clearance is generated among mutual long fibers even when the high-pressure water column flow is flowed, and pulp fibers are difficult to be flowed out. Since long fibers in zones except the point fusion zones are easy to be moved, the long fibers are interlocked excellently with pulp fibers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a wipe cloth such as disposable hand wipes, wet tissues, wipers, and disposable wipes.

[0002]

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

On the other hand, there is also used a nonwoven fabric in which rayon fibers, which are hydrophilic fibers, are accumulated, and then the rayon fibers are bonded to each other with a rubber binder soaked with water or the like. This wiping cloth has a high wetting strength because the rayon fibers are bonded to each other. However, since the wiping cloth contains a rubber-based binder, it has a drawback that it gives off an offensive odor. Further, since the rubber-based binder has a rough texture, the feeling of using the wiping cloth is not good. Therefore, attempts have been made to use a non-woven fabric in which rayon fibers are entangled with each other without using a rubber-based binder. To entangle the rayon fibers with each other, it is possible to apply a water column flow to the web in which the rayon fibers are accumulated. However, in order to sufficiently provide the entanglement by the water column flow, the rayon fiber must be accumulated in a large amount. That is, in a web having a small amount of rayon fibers accumulated, a relatively large gap is formed between the rayon fibers, and even if a water column flow is applied, the water column flow does not collide with the rayon fibers and easily passes through the gaps. Go through the web. That is, since the kinetic energy is not sufficiently applied to the rayon fibers, the rayon fibers do not move sufficiently, and as a result, the rayon fibers are not entangled with each other. Therefore, in order to sufficiently entangle the rayon fibers with each other, it is necessary to increase the amount of rayon fibers accumulated to reduce the fiber gap formed between the rayon fibers. However, when the amount of rayon fibers accumulated is increased, the thickness of the obtained wiping cloth becomes thicker, and there is a drawback that the quality becomes excessive when used as a disposable hand wipe or the like.

[0004]

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

However, when a wiping cloth is manufactured by this method, the following problems may occur. That is, a high-pressure water column flow is used to entangle long fibers and pulp fibers, but this high-pressure water column flow is recovered after use and filtered with a filter material, and the water is filtered into a high-pressure water column flow. To reuse. At this time, a large amount of pulp fiber was sometimes mixed in the recovered water. If a large amount of pulp fiber is mixed, the filter material may become clogged in a short period of time, which makes continuous operation over a long period of time impossible. Further, even when the high pressure water column flow is not recovered but discharged as it is as a waste liquid, if a large amount of pulp fibers are mixed, there is a fear that the waste liquid may cause environmental damage.

Therefore, the present inventors examined the cause of the pulp fibers flowing out together with the high pressure water column flow. As a result, it was found that the cause was the web laminated with the paper sheet made of pulp fiber. That is, since the long fibers are simply accumulated in the web, the long fibers may move easily when a high-pressure water column flow is applied, and a relatively large gap may occur. Then, the pulp fibers flow out through this gap. Therefore, the inventor of the present invention uses a long fiber non-woven fabric in which the long fibers are uniformly bonded to each other throughout the whole (that is, a general spunbonded non-woven fabric), and a paper sheet is laminated on the non-woven fabric to form a high pressure water column. The method of applying the flow was adopted. It has been found that when the long fibers are bonded to each other, the long fibers do not move easily, so that even if a high pressure water column flow is applied, a relatively large gap does not occur and the pulp fibers do not easily flow out. However, since the long fibers do not move easily, the long fibers and the pulp fibers are unlikely to be entangled with each other, and the obtained wiping cloth has a drawback that the pulp fibers are likely to fall off during use.

Therefore, according to the present invention, by adopting a long fiber non-woven fabric in which the long fibers constituting the long fiber non-woven fabric are relatively easy to move even if a high pressure water column flow is applied, but a relatively large gap is not generated, In addition to entwining long fibers and pulp fibers well, when collecting high pressure water column flow in the process of manufacturing wipes, the proportion of pulp fibers mixed in them is reduced, so that the wipes with good performance can be lengthened. It is intended to provide a method which can be continuously operated and manufactured over a period of time.

[0008]

That is, according to the present invention, a paper sheet is laminated on the surface of a long fiber non-woven fabric, and a high pressure water column flow is applied so as to penetrate from the paper sheet side to the long fiber non-woven fabric side. A method for producing a wiping cloth in which pulp fibers constituting the paper sheet and long fibers constituting the long fiber non-woven fabric are entangled with each other, wherein the long fiber non-woven fabric is self-fused between the long fibers. A large number of point fusion areas are arranged at intervals, the area of each of the point fusion areas is 0.01 to ⁴ mm ² , and the total area of all the point fusion areas is the surface area of the long fiber nonwoven fabric. The present invention relates to a method for manufacturing a wiping cloth, characterized in that it is 2 to 20% by area.

What is important in the method of manufacturing a wiping cloth according to the present invention is that a long-fiber nonwoven fabric having the following constitution is used. The long fiber non-woven fabric is formed by accumulating a large number of long fibers, but in the present invention, the long fiber non-woven fabric has a point fusion area where the long fibers are self-fused. And in areas other than the spot fusion area,
The long fibers are not fixed by themselves, and the long fibers are not fixed. Further, a large number of spot fusion zones are arranged at intervals. Therefore, the long-fiber non-woven fabric used in the present invention has a large number of point fusion-bonded areas in which the long fibers are fixed, and areas other than the point-fusion-bonded areas in which the long fibers are not fixed and exist in a free state. Will exist. When a long fiber non-woven fabric (long fiber web) in which the long fibers are not fixed at all by means such as self-fusion is used, when the high pressure water column flow is applied, the long fibers easily move, A large gap is likely to be formed, and the pulp fibers forming the paper sheet are likely to flow out from this gap together with the high-pressure water column flow, which is not preferable. On the other hand, when a long fiber non-woven fabric is used in which the long fibers are fixed to each other by means such as self-bonding, the long fibers do not move easily even if a high pressure water column flow is applied, and the paper sheet It is not preferable because it is unlikely to be entangled with the pulp fibers constituting the. For this reason,
Using the long-fiber non-woven fabric in which the above-mentioned point fusion areas are arranged at a large number of intervals, a large gap is less likely to occur even when a high pressure water column flow is applied to prevent the outflow of pulp fibers, and the point fusion areas It facilitates the movement of the long fibers in the other areas and promotes the entanglement with the pulp fibers.

In the long fiber non-woven fabric used in the present invention,
The individual area of a large number of spot fusion zones arranged at intervals is 0.01 to ⁴ mm ² , and preferably 0.04 to ² mm ² .
If this area is less than 0.01 mm ² , the number of long fibers self-bonding to each other is small, and when a high-pressure water column flow is applied, a relatively large gap is likely to occur, and pulp fibers flow out from this gap. It is not preferable because it is easy to do. Further, the tensile strength of the long fiber non-woven fabric is low, and when the obtained wiping cloth is used in a wet state and a desk or the like is rubbed, the wiping cloth is easily broken, which is not preferable. On the contrary, when the individual area exceeds 4 mm ² , the area of the point fusion area becomes large, the area where the long fibers and the pulp fibers are not entangled becomes large, and the pulp fibers fall off from the obtained wiping cloth. It is not preferable because it becomes easy. In addition, if the area of the spot fusion-bonded area becomes large, the flexibility of the long fiber non-woven fabric decreases, and the flexibility of the obtained wiping cloth also deteriorates, resulting in poor usability, which is not preferable.

The total area of the above-mentioned spot fusion zone is 2 to 20%, preferably 4 to 15%, based on the surface area of the long fiber nonwoven fabric. If the total area of the spot fusion area is less than 2%, there are too few self-fusion areas between the long fibers, and when a high-pressure water column flow is applied, a relatively large gap is likely to occur, resulting in pulp This is not preferable because the fibers easily flow out from this gap. Further, the tensile strength of the long fiber non-woven fabric is low, and when the obtained wiping cloth is used in a wet state and a desk or the like is rubbed, the wiping cloth is easily broken, which is not preferable. On the contrary, if the total area of the point fusion area exceeds 20%,
Since there are too many self-fusing points between the long fibers and the high pressure water column flow is applied, the long fibers do not easily move and the long fibers and the pulp fibers are not sufficiently entangled, which is not preferable.
Also, if there are too many self-fused portions, the flexibility of the long fiber non-woven fabric is reduced, and the flexibility of the obtained wiping fabric is also reduced, which is unfavorable for use.

As the long fibers constituting the long fiber non-woven fabric used in the present invention, any one can be used as long as the long fibers are softened or melted by heating. By this softening or melting, the surface of the long fibers becomes tacky, and the long fibers are self-bonded to each other to form spot-bonded areas. Specific examples of long fibers that can be used include long fibers made of polyamide-based resin such as nylon, long fibers made of polyacrylic ester resin, and long fibers made of polyolefin-based resin such as polypropylene and polyethylene. Examples thereof include fibers and long fibers formed of a polyester resin such as polyethylene terephthalate. In the present invention, the reason for using long fibers is that a nonwoven fabric made of long fibers is superior to a nonwoven fabric made of short fibers when the fibers are entangled with each other, and therefore, the tensile strength and the shape stability are excellent. Is.

The fineness of the long fibers used in the present invention is preferably 1 to 4 denier. When the fineness of the long fibers exceeds 4 denier, the flexibility of the long fiber non-woven fabric decreases, and the feeling of use when used as a wiping cloth tends to decrease. On the other hand, when the fineness of the long fibers is less than 1 denier, the production conditions of the long fibers become strict, and it tends to be difficult to produce the long fibers and eventually the long fiber non-woven fabric at a high speed. In addition, the basis weight of the long fiber nonwoven fabric is preferably 5 to 30 g / m ² . When the basis weight of the long fiber non-woven fabric exceeds 30 g / m ² , even if a high pressure water column flow is applied to the laminate of the paper sheet and the long fiber non-woven fabric from the paper sheet toward the long fiber non-woven fabric side,
The pulp fibers that make up the paper sheet are less likely to move to the back surface of the long fiber nonwoven fabric (the surface that is not in contact with the paper sheet),
Pulp fibers are unevenly distributed only on one surface of the obtained wiping cloth, and the water absorption tends to decrease on the surface having a small amount of pulp fibers. Further, the flexibility of the long fiber non-woven fabric itself is reduced, and thus the flexibility of the obtained wiping cloth is reduced,
There is a tendency for the usability to deteriorate. On the contrary, when the basis weight of the long fiber nonwoven fabric is less than 5 g / m ² , the morphological stability of the long fiber nonwoven fabric deteriorates, and the wet strength of the obtained wiping cloth tends to decrease. Furthermore, since the amount of long fibers is small, the gap between the long fibers becomes large, and when high pressure water column flow is applied, pulp fibers flow out from the gap, and when the high pressure water column flow is recovered after use. However, there is a risk that a large amount of pulp fibers will be mixed in the pulp fibers.

The long-fiber nonwoven fabric used in the present invention can be manufactured, for example, as follows. That is, it can be produced by accumulating a large number of long fibers to form a web and introducing this web between a heated concavo-convex roll and a smooth roll. In this case, the web is thermocompression bonded by the convex portions of the heated concavo-convex roll. At the place where the convex portion is pressure-bonded, the long fibers are softened or melted to form a spot fusion area where the long fibers are fused to each other.
This production example is only an example, and the long fiber nonwoven fabric used in the present invention can be obtained by other production methods. For example, a long fiber nonwoven fabric can be obtained by using an uneven roll instead of the above-mentioned smooth roll. In this case,
Since the web is introduced between the pair of concavo-convex rolls, the spots of the web where the convex portions of the concavo-convex rolls and the convex portions abut each other become the spot fusion zone.

A paper sheet is laminated on the surface of the long fiber non-woven fabric prepared as described above. The basis weight of the paper sheet can be arbitrarily determined, but it is particularly preferable to use a paper sheet having a basis weight of 10 to 100 g / m ² measured by the method specified in JIS P 8124. If the basis weight of the paper sheet is less than 10 g / m ² , the absolute amount of pulp fibers tends to be small, and it tends to be difficult to give sufficient water absorption and water retention to the obtained wipe. On the other hand, when the basis weight of the paper sheet exceeds 100 g / m ² , the absolute amount of pulp fibers is too large, and even if the paper sheet is subjected to high pressure water column flow, the individual pulp fibers are entangled with the long fibers. It tends to be difficult to give a sufficient amount of exercise.
Furthermore, there is a tendency that the absolute amount of pulp fibers is too large and the flexibility of the obtained wiping cloth decreases.

The pulp fibers that make up the paper sheet include
Crafting of coniferous and hardwood wood, sulfite method,
Unbleached pulp or bleached pulp cooked by the soda method, polysulfide method or the like, or mechanical pulp such as ground pulp or thermomechanical pulp can be used alone or in combination. In the case where the softwood pulp and the hardwood pulp are mixed and used, the mixing ratio by weight is preferably softwood pulp / hardwood pulp = 100 to 20/0 to 8
0, most preferably 100-40 / 0-60. If the hardwood pulp content exceeds 80% by weight, not only the outflow amount of the pulp due to high-pressure column flow increases but also the flexibility of the sheet after entanglement tends to decrease. The density of the paper sheet used in the present invention (measured by the method shown in JIS P 8118)
Is preferably 0.6 g / cm ³ or less, particularly 0.55 g / cm ^3.
Most preferably, it is not more than cm ³ . Paper sheet density is 0.6
When it exceeds g / cm ³ , when a high-pressure water column flow is applied from above the paper sheet, the movement of the pulp fibers is suppressed, and the amount of energy required for entanglement tends to increase.

This paper sheet is laminated on the surface of a long-fiber nonwoven fabric prepared in advance. At this time, the ratio of the basis weight of the long fiber nonwoven fabric to the basis weight of the paper sheet is preferably as follows.
That is, the ratio of the basis weight of the long fiber non-woven fabric to the basis weight of the paper sheet measured by the method shown in JIS P 8124 is such that the long fiber non-woven fabric: paper sheet = 1: 1 to 19, preferable. When the long-fiber non-woven fabric: paper sheet is less than 1: 1, the amount of pulp fibers becomes relatively small with respect to the amount of long fibers, and the water absorbency and water retention of the resulting wiping cloth tend to decrease.
In addition, the amount of inexpensive pulp fibers is smaller than that of long fibers, so that the obtained wiping cloth itself tends to be expensive. On the contrary, long-fiber non-woven fabric: paper sheet =
If the basis weight of the paper sheet becomes heavier than 1:19, all of the pulp fibers constituting the paper sheet become hard to be entangled with the long fibers firmly, and when the obtained wiping cloth is moistened and used, Pulp fibers tend to fall off easily.

After the paper sheet is laminated on the surface of the long fiber non-woven fabric, a high pressure water column flow is applied from the surface of the paper sheet toward the long fiber non-woven fabric side. That is, the high pressure water column flow is applied so that the high pressure water column flow penetrates from the paper sheet side of the laminate to the long fiber nonwoven fabric side. This high-pressure water column flow is obtained by ejecting water at high pressure through a nozzle hole having a fine diameter. For example, it can be obtained by ejecting water at a pressure of about 10 to 150 kg / cm ² through a nozzle hole having a hole diameter of about 0.01 to 0.3 mm. When this high-pressure water column flow is applied to the laminate, the high-pressure water column flow collides with the paper sheet. Then, the paper sheet first adheres to the long fiber non-woven fabric, and then in this adhered state,
The destruction of the paper sheet occurs, the pulp fibers that make up the paper sheet are isolated, the pulp fibers are deformed such as bending and twisting, and the kinetic energy is sufficiently given to the pulp fibers so that the pulp fibers randomly move. Cause As a result, the pulp fibers and the long fibers in the long fiber non-woven fabric are entangled by the composite action of these, and further, the long fibers are entangled with each other by the pulp fibers.

The wipe cloth obtained as described above is one in which pulp fibers and long fibers are entangled and integrated. If desired, a moistening agent such as water or propylene glycol, an antibacterial agent such as alcohols or parabenzoic acid, an antifungal agent, a chemical agent such as a fragrance, etc. may be added to this wiping cloth, and the disposable hand wipe, It is used as a wet tissue, wiper, disposable rag, etc.

[0020]

【Example】

Example 1 A large number of polypropylene filaments having a fineness of 2.5 denier were accumulated to form a web. Then, this web was introduced between a heated concavo-convex roll and a plain roll, and the web was thermocompression bonded by the convex portion of the concavo-convex roll. In the area crimped by the convex part, self-bonding between the long fibers,
A long-fiber nonwoven fabric was obtained. The resulting long-fiber nonwoven fabric had a large number of spot-fused areas arranged at intervals. The area of each spot fusion area was 0.3 mm ² , and the total area of all the spot fusion areas was 7 area% with respect to the surface area of the long fiber nonwoven fabric. The basis weight of the long fiber non-woven fabric was 20 g / m ² . A paper sheet obtained by wet papermaking using softwood bleached kraft pulp was laminated on the surface of this long-fiber nonwoven fabric. This paper sheet has a basis weight of 40 g / m.
² and the density measured by the method shown in JIS P 8118
It was 0.50 g / cm ³ . And the paper sheet is on top,
The long-fiber non-woven fabric was placed on a transfer conveyor formed of a wire mesh so that the non-woven fabric was positioned below. Then this laminate
While transporting at a speed of 30 m / min, a high-pressure water column flow is ejected at a water pressure of 50 kg / cm ² using a high-pressure water column flow ejection device in which nozzle holes with a hole diameter of 0.1 mm are arranged at 1 mm intervals, and the surface of the paper sheet Was subjected to high pressure water column flow. As described above, the pulp fibers forming the paper sheet and the long fibers forming the long fiber nonwoven fabric were entangled with each other to obtain an integrated wiping cloth.

Example 2 A large number of polyethylene terephthalate continuous fibers having a fineness of 2.3 denier were accumulated to form a web. Then, this web was introduced between a heated concavo-convex roll and a plain roll, and the web was thermocompression bonded by the convex portion of the concavo-convex roll. In the area crimped by the convex portion, the long fibers were self-bonded to each other to obtain a long fiber nonwoven fabric. The resulting long-fiber nonwoven fabric had a large number of spot-fused areas arranged at intervals. And the area of each point fusion area is 0.
It was 09 mm ² , and the total area of all the spot-fusion areas was 10 area% based on the surface area of the long-fiber nonwoven fabric. The basis weight of the long fiber non-woven fabric was 20 g / m ² . A paper sheet obtained by wet papermaking using softwood bleached kraft pulp was laminated on the surface of this long-fiber nonwoven fabric. This paper sheet has a basis weight of 30.
The density was 0.42 g / cm ³ at g / m ² and measured by the method described in JIS P 8118. Then, the paper sheet was placed on the upper side and the long fiber non-woven fabric was placed on the lower side, and the sheet was placed on the transfer conveyor formed of the wire mesh. Next, while transporting this laminate at a speed of 30 m / min, a high-pressure water column flow is ejected at a water pressure of 60 kg / cm ² using a high-pressure water column flow ejection device in which nozzle holes with a hole diameter of 0.1 mm are arranged at 1 mm intervals. Then, a high-pressure water column flow was applied to the surface of the paper sheet. As described above, the pulp fibers forming the paper sheet and the long fibers forming the long fiber nonwoven fabric were entangled with each other to obtain an integrated wiping cloth.

Example 3 A large number of polypropylene filaments having a fineness of 3.3 denier were accumulated to form a web. Then, this web was introduced between a heated concavo-convex roll and a plain roll, and the web was thermocompression bonded by the convex portion of the concavo-convex roll. In the area crimped by the convex part, self-bonding between the long fibers,
A long-fiber nonwoven fabric was obtained. The resulting long-fiber nonwoven fabric had a large number of spot-fused areas arranged at intervals. The area of each point fusion area is 2 mm ² .
The total area of all spot fusion zones was 6 area% based on the surface area of the long fiber nonwoven fabric. The basis weight of long-fiber nonwoven fabric is 15
It was g / m ² . 80% by weight of softwood bleached kraft pulp and 20% of hardwood bleached kraft pulp on the surface of this long-fiber nonwoven fabric.
The paper sheets obtained by wet papermaking were laminated using a mixture of wt%. This paper sheet has a basis weight of 30 g / m ²
Density of 0.42 g / cm ³ measured by the method shown in IS P 8118
there were. Then, the paper sheet was placed on the upper side and the long fiber non-woven fabric was placed on the lower side, and the sheet was placed on the transfer conveyor formed of the wire mesh. Then, while transporting this laminate at a speed of 30 m / min, a high-pressure water column flow is ejected at a water pressure of 40 kg / cm ² using a high-pressure water column flow ejection device in which nozzle holes with a hole diameter of 0.1 mm are arranged at 1 mm intervals. Then, a high-pressure water column flow was applied to the surface of the paper sheet. As described above, the pulp fibers forming the paper sheet and the long fibers forming the long fiber nonwoven fabric were entangled with each other to obtain an integrated wiping cloth.

Example 4 A large number of polypropylene filaments having a fineness of 1.5 denier were accumulated to form a web. Then, this web was introduced between a heated concavo-convex roll and a plain roll, and the web was thermocompression bonded by the convex portion of the concavo-convex roll. In the area crimped by the convex part, self-bonding between the long fibers,
A long-fiber nonwoven fabric was obtained. The resulting long-fiber nonwoven fabric had a large number of spot-fused areas arranged at intervals. The area of each spot fusion area was 0.3 mm ² , and the total area of all the spot fusion areas was 15 area% with respect to the surface area of the long fiber nonwoven fabric. The basis weight of the long fiber non-woven fabric was 15 g / m ² . A paper towel (manufactured by Oji Paper Co., Ltd., basis weight 22 g / m ² ) which is a paper sheet was laminated on the surface of this long-fiber nonwoven fabric. Then, with the paper towel positioned above and the long-fiber non-woven fabric positioned below,
It was placed on a transfer conveyor formed of wire mesh. Then
While transferring this laminate at a speed of 30 m / min, the pore size was 0.
A high-pressure water column flow was ejected at a water pressure of 40 kg / cm ² by using a high-pressure water column flow ejection device in which 1 mm nozzle holes were arranged at 1 mm intervals, and the high pressure water column flow was applied to the surface of the paper towel. As described above, the pulp fibers forming the paper towel and the long fibers forming the long fiber non-woven fabric were entangled with each other to obtain an integrated wiping cloth.

Example 5 A large number of polypropylene filaments having a fineness of 2.3 denier were accumulated to form a web. Then, this web was introduced between a heated concavo-convex roll and a plain roll, and the web was thermocompression bonded by the convex portion of the concavo-convex roll. In the area crimped by the convex part, self-bonding between the long fibers,
A long-fiber nonwoven fabric was obtained. The resulting long-fiber nonwoven fabric had a large number of spot-fused areas arranged at intervals. The area of each spot fusion area was 0.08 mm ² , and the total area of all the spot fusion areas was 3% by area based on the surface area of the long fiber nonwoven fabric. The basis weight of the long fiber non-woven fabric was 15 g / m ² . A paper sheet obtained by wet papermaking using softwood bleached kraft pulp was laminated on the surface of this long-fiber nonwoven fabric. This paper sheet has a basis weight of 70 g / m.
² and the density measured by the method shown in JIS P 8118
It was 0.50 g / cm ³ . And the paper sheet is on top,
The long fiber non-woven fabric was placed on the lower side so that it was placed on a transfer conveyor formed of wire mesh. Then this laminate
While transporting at a speed of 30 m / min, a high pressure water column flow jetting device with nozzle holes of 0.1 mm in diameter arranged at 1 mm intervals was used to jet a high pressure water column flow at a water pressure of 80 kg / cm ² and the surface of the paper sheet. Was subjected to high pressure water column flow. As described above, the pulp fibers forming the paper sheet and the long fibers forming the long fiber nonwoven fabric were entangled with each other to obtain an integrated wiping cloth.

Example 6 A long fiber nonwoven fabric similar to that of Example 1 was prepared except that the fineness was 5 denier and the basis weight was 30 g / m ² . Also,
A paper sheet similar to that in Example 1 was prepared except that the basis weight was 20 g / m ² . Using this long-fiber nonwoven fabric and a paper sheet, a wiping cloth was obtained in the same manner as in Example 1.

In the method for manufacturing the wiping cloth according to Examples 1 to 6 as described above, the high-pressure water column flow used is recovered,
Although reused, pulp fibers were found to be contained in the recovered water in a very small amount. In addition, Example 1
The wiping cloths obtained by the methods according to Nos. 6 to 6 were excellent in flexibility and feeling in use, and were also good in water absorption and water retention. Furthermore, even if the table is rubbed strongly in a wet state, it will tear,
Delamination between the long-fiber non-woven fabric and the paper sheet, falling of pulp fibers, and the like were less likely to occur, and the wiping cloth after use could be washed with water and repeatedly used. In terms of flexibility, the wiping cloth according to Example 6 was slightly inferior to the wiping cloths according to other Examples.

Comparative Example 1 Example except that the area of each point fusion area was 0.006 mm ² and the total area of all point fusion areas was 4 area% based on the surface area of the long fiber nonwoven fabric. A long fiber non-woven fabric similar to that of No. 1 was prepared. Then, a wiping cloth was manufactured in the same manner as in Example 1. In this manufacturing method as well, the used high-pressure water column flow is recovered and provided for reuse. However, in the recovered water, a larger amount of pulp fiber than in the cases according to Examples 1 to 5 is used. Was mixed. This is because the long fiber non-woven fabric with a small area of each point fusion area was used, so the number of fixed long fibers was small, and when a high-pressure water column flow was applied, a relatively large gap was created, and pulp fibers from this point were generated. It is believed that this is because In addition, the obtained wipe is
It had a low tensile strength and was easily broken when the table was rubbed strongly in a wet state.

Comparative Example 2 The area of each spot fusion area was 6 mm ² , and the total area of all the spot fusion areas was 15% by area based on the surface area of the long fiber nonwoven fabric.
A long-fiber non-woven fabric similar to that of Example 1 was prepared except for the above. Then, a wiping cloth was manufactured in the same manner as in Example 1. The wiping cloth obtained by this method had portions where the long fibers and the pulp fibers were not entangled well, and the pulp fibers were likely to fall off during use. This is because the pulp fibers are not sufficiently entangled with the long fibers at this point due to the large area of each point fusion zone.

Comparative Example 3 Example except that the area of each spot fusion area was 0.6 mm ² and the total area of all the spot fusion areas was 30 area% based on the surface area of the long fiber nonwoven fabric. A long fiber non-woven fabric similar to that of No. 1 was prepared. Then, a wiping cloth was manufactured in the same manner as in Example 1. The wiping cloth obtained by this method did not entangle the long fibers and the pulp fibers well, and the pulp fibers were likely to fall off during use. This is because the total area of the point fusion area relative to the surface area of the long fiber non-woven fabric is large, so there are few long fibers that can move freely, and entanglement with the pulp fibers does not proceed.

[0030]

As described above, in the method for manufacturing a wiping cloth according to the present invention, a paper sheet is laminated on the surface of a long fiber non-woven fabric in which a large number of spot fusion zones are arranged at intervals. Then, a high-pressure water column flow is applied. The long fibers constituting this long-fiber nonwoven fabric are fixed in the spot fusion-bonded area. Therefore, when high pressure water column flow is applied so as to penetrate from the paper sheet side to the long fiber non-woven fabric side, since the long fibers are fixed in the point fusion zone, a large gap does not occur between the long fibers, and the pulp The fibers can be prevented from flowing out together with the high pressure water column flow. Therefore, when the high pressure water column flow is collected, filtered with a filter material and used again, clogging of the filter material can be prevented, and continuous production of a wiping cloth can be achieved for a long period of time. Further, since the long fibers in the area other than the spot fusion area exist in a free state in which they are relatively easy to move, the pulp fibers and the long fibers are well entangled with each other when the high pressure water column flow is applied. Therefore, when the wiping cloth is used, the pulp fibers are less likely to fall off.

Claims (1)

[Claims] 1. A pulp fiber forming a paper sheet by laminating a paper sheet on the surface of a long fiber non-woven fabric and applying a high-pressure water column flow so as to penetrate from the paper sheet side to the long fiber non-woven fabric side. A method for producing a wiping cloth in which long fibers constituting the long fiber non-woven fabric are entangled with each other, wherein the long fiber non-woven fabric is self-fused between the long fibers, and a plurality of point-fused areas are provided at intervals. The area of each said point-fused area is 0.01 to ⁴ mm ² and the total area of all said point-fused areas is 2 to 20% by area based on the surface area of said long fiber nonwoven fabric. A method for manufacturing a wiping cloth, which is characterized by the above.