JP3358356B2 - Composite nonwoven fabric having aperture pattern and method for producing composite nonwoven fabric - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite nonwoven fabric comprising staple fibers and wood pulp fibers, which is suitable for industrial wipers and wipes, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a wiper, a dry pulp sheet is used in which cellulose pulp fibers are bulky accumulated, and then a water-soluble emulsion of a synthetic polymer resin is applied or impregnated as a binder and dried. . However, although the dry pulp sheet has good wiping properties, it has a drawback that the constituent fibers are cellulose pulp fibers, and the fiber length is short, so that the wet strength is weak and the fibers are easily broken when used in a wet state. . In order to improve this, it is necessary to contain a large amount of a binder made of the resin of the synthetic polymer compound, but as the content of the synthetic polymer compound increases, one of the most important characteristics as a wiper is There is a drawback that the wiping property is deteriorated due to a decrease in a certain liquid absorbing property, and at the same time, the flexibility of the sheet is impaired.

[0003] Similarly, a non-woven fabric in which rayon fibers, which are hydrophilic fibers, are accumulated and then the rayon fibers are bonded to each other with a water-soluble emulsion of a synthetic polymer resin as a binder is also used. It is necessary to increase the content of a binder made of a synthetic polymer resin in order to improve the strength of the resin, and, like the non-woven fabric made of the cellulose pulp fiber, achieve both wet strength and liquid absorbency, and flexibility. It was difficult.

For this reason, nonwoven fabrics in which rayon fibers are entangled with each other without using a binder made of a synthetic polymer compound resin are also used. For the entanglement of the rayon fibers, a method of applying a high-pressure water column flow to a web on which the rayon fibers are accumulated to entangle the fibers is considered. However, in order to sufficiently impart the entanglement due to the high-pressure water column flow, there is a problem that the amount of accumulated rayon fibers must be large. In other words, a web in which the amount of rayon fibers accumulated is small, the gap between the rayon fibers is relatively large,
Even when a high-pressure water column flow is applied, the high-pressure water column flow passes through the gap without colliding with the rayon fiber, so that work is not efficiently performed.

In other words, in this case, sufficient kinetic energy cannot be given to the rayon fibers, so that the rayon fibers forming the web are not sufficiently entangled with each other. Therefore, in order to sufficiently interlace the rayon fibers, it is necessary to increase the accumulation amount of the rayon fibers and reduce the fiber gap formed between the rayon fibers, but if the accumulation amount of the rayon fibers is increased, In addition, the thickness of the obtained wiper is increased, so that not only the flexibility is impaired, but also the manufacturing cost is increased.

Japanese Patent Application Laid-Open No. Hei 5-214654 discloses that thin paper is laminated on both sides of a continuous long-fiber web having a basis weight of 5 to 30 g / m ² and a fineness of 1.5 to 3 denier to form a laminate. A method of manufacturing a wiping cloth made of a composite nonwoven fabric using a spunbonded nonwoven fabric is disclosed in which a pulp fiber and a long fiber are entangled and integrated by injecting a water column flow from the pulp fiber. The resulting wiping cloth has excellent tensile strength due to entanglement between long fibers and excellent water absorption by pulp fibers,
It can be suitably used for disposable hand wipes, wet tissues, disposable rags and the like.

[0007] Japanese Patent Application Laid-Open No. 5-253160 discloses that a wet tensile strength of 0.04 to 0.06 kgf according to JIS P 8135 is applied to the surface of a long fiber web having a basis weight of 5 to 30 g / m ² and a fineness of 1 to 4 deniers. By laminating paper sheets having, pulp fibers and long fibers are entangled by injecting a high-pressure water column flow from the surface of the paper sheet toward the long fiber web side,
A method for manufacturing a wipe made of a composite nonwoven fabric using a spunbonded nonwoven fabric is disclosed.

Further, Japanese Unexamined Patent Publication No. Hei 5-286100 discloses a spunbonded nonwoven fabric used for the composite nonwoven fabric, in which point fusion areas formed by self-fusion between long fibers are spaced apart from each other. While many are arranged,
The area of the individual spot fusion zones is 0.01-4 mm ² ,
In addition, a paper sheet made of pulp fiber is laminated on the surface of a long-fiber nonwoven fabric having a total area of all the point fusion zones of 2 to 20% by area with respect to the surface area of the long-fiber nonwoven fabric, and from the paper sheet side to the nonwoven fabric side When water is entangled by jetting through the water column flow, the long fibers fixed by point fusion of the long-fiber non-woven fabric are not affected by kinetic energy, and the non-point-fused long fibers and pulp are not affected. Since the fibers are entangled with each other, a large gap is not generated between the long fibers, and the pulp fibers can be prevented from flowing out together with the high-pressure water column flow.

[0009] However, the composite nonwoven fabric produced as described above is excellent in wet strength, liquid absorbency and flexibility, but the obtained composite nonwoven fabric is used for wipers for an offset printing machine blanket automatic washing machine, wipers for a clean room, etc. However, the following drawbacks have been encountered when trying to use it for wiping cloths. In order to give the composite nonwoven fabric high wiping performance against dirt, it is effective to perform a hole opening treatment on the composite nonwoven fabric and to improve the wiping performance by utilizing the unevenness on the surface. However, on the contrary, such a hole opening treatment has a disadvantage that a liquid that cannot be removed remains in a streak shape at the time of wiping finish. In order to prevent this drawback, it is effective to use a wiping cloth having a uniform nonwoven fabric surface without unevenness due to the pattern of openings on the surface of the composite nonwoven fabric.

Therefore, as a method of reducing the residual amount of the liquid that cannot be removed while maintaining high wiping performance against dirt, it is effective to provide the composite nonwoven fabric with the finest possible hole pattern. The reason why the aperture pattern is formed on the surface of the composite nonwoven fabric by the high-pressure water column flow treatment is that, when viewed from the wire side, the nonwoven fabric and the paper sheet are laminated in this order on the support wire for conveyance, and the paper sheet side of the laminate is formed. When the high-pressure water column flow is applied so that the high-pressure water column flow penetrates from the knuckle portion of the support wire (the point where the warp and weft cross the wire), the water flow injected into the knuckle portion Although the fibers flow downward along the surface, the fibers constituting the nonwoven fabric and the wood pulp fibers constituting the paper sheet located at the knuckle portion of the support wire are also pushed down along with the water flow, so that the fibers remain at the knuckle portion. It is considered that a hole pattern is formed.

However, when a non-woven fabric having a film-like point-fused portion is used as the non-woven fabric, even at this point-fused portion, the water flow does not penetrate. In addition to the regular opening pattern, the opening pattern formed due to the loss of the wood pulp fiber occurs. For this reason,
The knuckle part is small in order to obtain a composite nonwoven fabric having a fine opening pattern, that is, even if a support wire having a small wire diameter is used, in addition to the intended opening pattern, the opening unevenness due to the fused part occurs, This has the disadvantage that a composite nonwoven fabric having a uniform and fine opening pattern cannot be obtained.

[0012]

In view of the above situation, the present inventors have developed a synthetic fiber exhibiting heat-fusibility in place of the embossed spunbonded nonwoven fabric constituting the composite nonwoven fabric. Using a fibrous web composed of staple fibers, the fusion of the heat-fusible fibers is heated and melted, and the fibers are fused and bonded at the intersection of the constituent fibers into a nonwoven fabric. It has been found that by laminating the composite nonwoven fabric, the defect of the aperture pattern of the composite nonwoven fabric composed of the spunbonded nonwoven fabric which is hot-embossed and bonded to the paper sheet can be solved, and the present invention has been completed. An object of the present invention is excellent in water absorbency and wiping properties, in particular, there is no line unevenness after wiping a liquid, and wipers for an offset printing press blanket automatic washing machine, wipers for a clean room, industrial wipes, etc. Another object of the present invention is to provide a composite nonwoven fabric which can be suitably used for a so-called wiping cloth application such as a wet tissue, a towel, and a disposable towel, and a method for producing the same.

[0013]

SUMMARY OF THE INVENTION A first aspect of the present invention is to form a staple fiber of heat fusible fibers alone or a mixture of heat fusible fibers and non-heat fusible fibers in a sheet form. A wood pulp fiber comprising a nonwoven fabric made of a fibrous web, in which the constituent fibers are partially fused and joined by heat-fusible fibers, and a paper sheet made of wood pulp fiber, And the unfused fibers are three-dimensionally entangled and integrated by a high-pressure water column flow treatment, and have an aperture pattern by the high-pressure water column flow. A second aspect of the present invention is to form a fibrous web by accumulating staple fibers of the heat-fusible fibers alone or a mixture of the heat-fusible fibers and the non-heat-fusible fibers in a sheet shape, and then heating the heat. The low melting point component of the fusible fiber is partially melted, and the fibers are fused and bonded at the intersections of the constituent fibers into a nonwoven fabric, and a paper sheet made of wood pulp fiber is laminated thereon, and the paper sheet side A high-pressure water column flow is injected so as to penetrate into the non-woven fabric side, and staple fibers constituting the non-woven fabric and pulp fibers constituting the paper sheet are three-dimensionally entangled and integrated. A method for producing a composite nonwoven fabric, characterized in that an opening pattern is applied to the composite nonwoven fabric.

In the present invention, staple fibers having a low melting point of 90 to 140 ° C., preferably 100 to 135 ° C. and exhibiting adhesiveness are used as heat-fusible fibers for the production of nonwoven fabrics. Examples of the heat-fusible fibers include polyester (PET) / polyethylene (PE) core-sheath composite fibers, nylon / PET core-sheath composite fibers, and modified PET /
Composite type heat fusible fibers such as PET side-by-side type composite fibers, or staple fibers such as PE fibers in the above-mentioned temperature range and modified PET fibers can be used. . As the core of the core-sheath type composite fiber, a fiber made of a non-heat-fusible resin having a high melting point in the range of 150 to 300 ° C. is used. Low melting point fiber. On the other hand, in the case of the side-by-side type conjugate fiber, the low melting point portion occupying half of the fiber cross section is involved in the fusion bonding of the fiber.

The fineness of the staple fiber made of the heat-fusible fiber is 1 to 10 denier, preferably 1 to 5 denier. If the staple fiber has a fineness of less than 1 denier, the fibers are easily entangled with each other when the staple fibers are defibrated, and it is difficult to obtain a uniform web. When the fineness of the staple fiber exceeds 10 denier, the texture of the obtained nonwoven fabric becomes hard, and when compared with a nonwoven fabric of the same basis weight having a fiber diameter of 10 denier or less, the fiber gap constituting the nonwoven fabric becomes too large, During the high pressure water column treatment with the sheet, the outflow of pulp increases, which is not preferable. In order to reduce the fiber gap, it is conceivable to increase the amount of staple fibers and increase the basis weight of the nonwoven fabric, but this is not preferable because not only the texture of the nonwoven fabric becomes further hard, but also the cost increases.

In the present invention, in addition to the staple fiber made of the heat-fusible fiber, a staple fiber made of a non-fusible fiber having a high melting point in the range of 150 to 300 ° C. can be used in combination. Examples of the staple fiber having a high melting point include polyolefin fibers (melting point 150 to 180 ° C), polyester fibers (melting point 250 to 280 ° C), and polyamide fibers (melting point 180
To 300 ° C.), and at least one of them is appropriately selected from these. When the heat-fusible fiber and the non-fusible fiber having a high melting point are used in combination, the difference in melting point is 10 ° C or more, preferably 20 ° C or more. If the difference in the melting points is less than 10 ° C., the fibers are not suitable for fusion bonding of the fibers by heating after forming the web.

The fineness of the staple fiber of the non-adhesive fiber having a high melting point is the same as that of the heat-fusible fiber, and the compounding ratio of the staple fiber is 0 to 75% by weight based on the weight of the absolutely dried fiber. is there. If the blending ratio of the staple fiber exceeds 75% by weight, the fusion bonding by the heat-fusible fiber having a low melting point becomes too weak, and the tensile strength is lowered, which is not suitable. However, since the blending ratio is slightly different from the type of the heat-fusible fiber, the difference between the melting points of the fibers having a high melting point and the low melting point, and the fineness, etc., the strength and texture of the nonwoven fabric are slightly different, so that the blending ratio is appropriately within the above-described blending ratio. The blend ratio is determined by selection.

As a method for forming the web, a known short fiber accumulating method such as a card method, an air lay method, or a wet method can be used. However, since the bulky and high-strength nonwoven fabric is easily obtained, the card method is used. Preferably, it is used to form a web. The fiber length of the staple fiber can also be appropriately determined according to the web forming method. In the case of the card method, the fiber length is appropriately determined within a range of 30 to 120 mm. The reason why the web obtained by the card method is easily compatible with both bulkiness and high strength is that when a composite nonwoven fabric is formed by laminating and integrating with a paper sheet, the paper sheet is subjected to a high-pressure water column flow treatment used for integration. It goes without saying that the pulp fibers inside and the staple fibers constituting the nonwoven fabric are entangled with water, but since some of the staple fibers are entangled with each other by the water column flow, the strength of the obtained composite nonwoven fabric Is considered to be further improved.

Since the fiber which can be used in the card method has a longer fiber length than the fiber which can be used in the air lay method or the wet method, the strength of the nonwoven fabric itself obtained is higher than in the air lay method or the wet method. At the same time, the effect of improving the strength by the water column flow treatment is easily obtained, so that a high-strength composite nonwoven fabric can be obtained. Also, where
The reason for trying to obtain a bulky composite non-woven fabric is that the composite non-woven fabric is used for offset printing machine blanket automatic cleaning machine wipers,
When used for wipers such as wipers for clean rooms, industrial wipers, etc., the absorbency of liquids such as oil and water is one of the very important performances for composite nonwoven fabrics. This is because it is possible to maintain a large amount of liquid and to hold a large amount of liquid in the gap, so that the nonwoven fabric has excellent liquid absorbability.

In the web formed as described above,
When heated, the low-melting fiber melts and is fused and joined together at the intersections of the fibers constituting the web to form the nonwoven fabric used in the present invention. As a method of heating the web, for example, a method of passing the formed web through a known drying device such as a drum type hot air dryer, a through-air dryer, and a floating dryer can be used. By fusing the fibers to each other at the intersections of the fibers constituting the nonwoven fabric in this manner, a nonwoven fabric having high strength can be obtained without having a film-like point fusion portion. In addition, when a paper sheet is laminated on this nonwoven fabric and subjected to high-pressure water column flow treatment to form a composite nonwoven fabric, in addition to the fusion bonding at the fiber intersections, a high degree of entanglement between constituent fibers is also achieved. Is formed, so that the obtained composite nonwoven fabric has high strength.

The basis weight of the nonwoven fabric is 5 to 100 g / m ² , preferably 5 to 50 g / m ² . Nonwoven fabric weight is 10
If it exceeds 0 g / m ² , it becomes difficult for the pulp fiber to move in the thickness direction of the nonwoven fabric when the staple fiber and the pulp fiber are entangled by the water column entanglement treatment, and the fibers are not sufficiently entangled. Conversely, the basis weight of the nonwoven fabric is 5 g / m ²
If it is less than 10, the tensile strength and tear strength of the nonwoven fabric decrease, and the strength of the obtained composite nonwoven fabric decreases, which is not suitable for practical use.
Furthermore, in this case, the gap between the fibers of the nonwoven fabric becomes large,
The loss due to the outflow of pulp fibers increases, and a large amount of pulp fibers flows out of the used wastewater in the high-pressure water column flow treatment, thereby increasing the drainage load.

The paper sheet and the processing method after laminating the paper sheet and the nonwoven fabric which can be used in the present invention are described in JP-A-5-214654 and JP-A-5-251.
Known methods disclosed in JP-A-360-360 and JP-A-5-286100 can be used. The method is described below. Any known paper sheet can be used. The basis weight of the paper sheet can also be arbitrarily determined, but a paper sheet having a basis weight of 10 to 100 g / m ² measured by a method according to JIS P 8124 is particularly preferably used. If the basis weight of the paper sheet is less than 10 g / m ² , the absolute amount of pulp fibers in the composite nonwoven fabric will be small, and it will be difficult to impart sufficient liquid absorbency to the obtained composite nonwoven fabric. Conversely, if the basis weight of the paper sheet exceeds 100 g / m ² ,
Since sufficient kinetic energy cannot be imparted to the pulp fibers when applying a high-pressure water column flow, it is difficult to sufficiently entangle the pulp fibers with the staple fibers and the staple fibers.

The pulp fibers constituting the paper sheet include:
Unbleached pulp obtained by cooking coniferous or hardwood wood by the Kraft method, the sulfite method, the soda method, the polysulfite method, or the like, or bleached pulp obtained by multi-stage bleaching if necessary, A mechanical pulp such as a ground pulp or a thermomechanical pulp from the coniferous wood can be mixed and used. The paper sheet for the present invention is preferably composed of softwood pulp, but may be a mixed pulp of softwood pulp and hardwood pulp. The absolute dry weight compounding ratio in that case is in the range of softwood pulp: hardwood pulp = 100: 0 to 20:80, preferably 100: 0 to 40:60. When the hardwood pulp exceeds 80% of the total dry pulp weight, the high pressure water column flow treatment using the obtained paper sheet not only increases the pulp loss, but also increases the texture of the composite nonwoven fabric after entanglement. descend.

JIS of the paper sheet used in the present invention
The density according to P 8118 is 0.65 g / cm ³ or less. If the density of the paper sheet exceeds 0.65 g / cm ³ , the movement of the pulp fiber is suppressed when a high-pressure water column flow is applied from above the paper sheet, so that the entanglement between the staple fiber and the pulp fiber is insufficient. And the softness of the nonwoven fabric after entanglement is reduced, and the texture is reduced. However,
There is a limit to reducing the density of the paper sheet, and the lower limit is 0.2%, which is as soft as tissue paper.
It is about 0 g / cm ³ . The paper sheet is usually obtained by making a paper by a known wet papermaking method using a slurry containing the pulp fiber and drying with a dryer,
During papermaking, for example, a wet paper strength agent such as a polyamide / epichlorohydrin resin or a modified product thereof, a polyamine / epichlorohydrin resin, a melanin resin, or a urea resin may be added to the slurry.

This paper sheet is laminated on one side of a previously prepared nonwoven fabric. At this time, JIS P 8124
The absolute dry weight ratio between the basis weight of the nonwoven fabric and the basis weight of the paper sheet is as follows:
Non-woven fabric: paper sheet = 1: 1 to 1:19. When the weight ratio of the nonwoven fabric to the paper sheet is less than 1: 1, the amount of pulp fibers is relatively small relative to the amount of staple fibers constituting the nonwoven fabric, and the resulting composite nonwoven fabric has sufficient absorption. It becomes difficult to impart liquid properties, and the wiping properties are reduced. Further, the production cost of a composite nonwoven fabric obtained by reducing the amount of inexpensive pulp relative to staple fibers increases, which is not suitable. Conversely, the weight ratio of nonwoven fabric to paper sheet is 1: 1
When the ratio of the paper sheet is increased beyond 9, the pulp fibers constituting the paper sheet are hardly entangled with the staple fibers constituting the nonwoven fabric, which is not suitable.

When a high-pressure water column flow is applied from the surface of the paper sheet to the nonwoven fabric side after the paper sheet is laminated on one side of the nonwoven fabric, the high-pressure water column flow penetrates from the paper sheet side of the laminate to the nonwoven fabric side. Then, a high-pressure water column flow is applied. This high-pressure water column flow has a fine pore diameter, for example, a diameter of 0.01 to 0.1 mm.
High pressure through a 3 mm nozzle hole, e.g.
It is obtained by ejecting water at a pressure of 0 kg / cm ² . When this high-pressure water column flow is applied to the laminate, the high-pressure water column flow first collides with the paper sheet, causing the paper sheet to adhere to the nonwoven fabric, and then causing the paper sheet to adhere to the nonwoven fabric, causing partial destruction of the paper sheet. In addition, the pulp fibers constituting the paper sheet at that portion are isolated, and the pulp fibers are deformed, such as being bent and twisted, and the pulp fibers are given sufficient kinetic energy to cause random movement. As a result, the pulp fiber and the staple fiber are entangled by these combined actions, and the staple fibers constituting the nonwoven fabric are entangled with each other. By this high-pressure water column flow treatment, a composite nonwoven fabric in which staple fibers and pulp fibers are strongly entangled is obtained.

When a high-pressure water stream is applied from the surface of the paper sheet to the non-woven fabric side after the paper sheet is laminated on one side of the non-woven fabric as described above, a high pressure is applied from the paper sheet side of the laminate to the non-woven fabric side. The high-pressure water column flow is applied so that the water column flow penetrates. On the nonwoven fabric side of the laminate, a support net made of a transport wire is installed. By applying a flow,
Since the highest part of the support net (the point where the warp and weft intersect), that is, the knuckle part, cannot pass water, the pulp fiber and staple fiber on this point are swept downward, forming an aperture there. I do.

The pattern of the opening can be appropriately selected in consideration of the wire diameter and the mesh of the supporting net.
No. 8950, Japanese Patent Application No. 5-342038 and Japanese Patent Application No. 5
The method can be appropriately selected by a method proposed in Japanese Patent No. 342039. In the nonwoven fabric used in the present invention,
Since there is no point-fused portion in which several filaments are overlapped to form a film, such as formed by a hot embossing roll, a fine hole pattern can be obtained. To do so, it is only necessary to reduce the diameter of the wire,
As a result, a composite nonwoven fabric having uniform openings without formation disorder can be obtained.

As described above, a staple fiber having a heat-fusible fiber alone as a constituent fiber or a staple fiber having a mixture of a heat-fusible fiber and a high melting point non-heat-fusible fiber as a constituent fiber may be used. It is accumulated in the form of a web by a known method, and is heated to partially melt the low-melting heat-fusible fiber of the web, and the fibers are fused together at the intersection of the constituent fibers of the web, on the bonded nonwoven fabric, A paper sheet is laminated, a high-pressure water column flow is injected so as to penetrate from the paper sheet side to the nonwoven fabric side, and staple fibers and pulp fibers are three-dimensionally entangled and integrated, and at the same time, the composite obtained by the high-pressure water column flow is obtained. By forming an opening pattern in the nonwoven fabric, it is possible to obtain a composite nonwoven fabric having a bulky, excellent liquid absorbing property and strength, and having uniform openings without disturbing formation even in a fine opening pattern. . This composite nonwoven fabric can be suitably used for wipers for an offset printing machine blanket automatic washing machine, wipers for a clean room, industrial wipes such as an industrial rag, or so-called wipe cloths such as wet tissues, towels, and disposable towels. Things.

[0030]

EXAMPLES The present invention will be specifically described below with reference to examples, but of course, the present invention is not limited to these examples.

Example 1 A core-sheath composite type heat-fusible fiber made of polyester (PET) -polyethylene (PE) having a fineness of 2 denier and an average fiber length of 51 mm (PE: sheath melting point 130 ° C., N-710;
After forming the web with roller card by Kuraray), 13
The mixture was introduced into a through-air dryer heated to 5 ° C., and heat-fusion bonding was generated at the intersections of the fibers to obtain a nonwoven fabric having a basis weight of 20 g / m ² . On this nonwoven fabric, a paper sheet obtained by wet papermaking using bleached softwood kraft pulp was laminated. This paper sheet has a basis weight of 72 g / m ² measured by the method described in JIS P 8124, and a density of 0.
It was 52 g / cm ³ . Then, the paper sheet was placed on a transfer supporting net formed of a wire mesh with the paper sheet positioned above and the nonwoven fabric positioned below.

Next, while transferring the laminate at a speed of 15 m / min, a nozzle hole having a hole diameter of
Using a high-pressure water column jet device arranged at intervals of mm, 80
A high-pressure water column flow was injected at a water pressure of kg / cm ² , and the paper sheet surface was subjected to a high-pressure water column flow treatment. As described above, the wood pulp fiber constituting the paper sheet and the staple fiber constituting the nonwoven fabric were entangled and integrated to obtain a composite nonwoven fabric. As the opening pattern of the composite non-woven fabric, a support net was selected so as to provide a thin opening pattern (pattern 1). The basis weight, thickness, bulkiness, tensile strength, wet tensile strength, texture, formation, water absorbency, oil absorbency, and wiping property of the obtained composite nonwoven fabric were tested and evaluated by the following test methods, and the results were tabulated. 1 is shown.
As the support net for pattern 1, the diameter of the wire is warp,
A plain weave stainless steel wire having a weft of 0.4 mm and a wire mesh of 25 mesh was used.

Test Method (1) Weight Weight was measured by a method according to JIS P8124. The unit was expressed in g / m ² . (2) Thickness The thickness was measured by a method according to JIS P8118. The unit was expressed in μm. (3) Bulkiness Comparison was made at a low load density obtained from the thickness measured using a sample thickness meter (HC3305, manufactured by Yamaden Corporation) connected to a creep meter (RE3305, manufactured by Yamaden Corporation). The lower the load density, the higher the bulk. Conditions for creep meter measurement were as follows: load 0.25 g / cm 2, speed 0.5 mm
/ Sec, and the pressed area was 2.01 cm ² . (4) Tensile strength Tensile tester (Tensilon universal tensile tester, PTM-10
0, manufactured by Toyo Seimitsu Kogyo Co., Ltd.)
A tensile test was performed with a sample length of 100 mm and a sample width of 50 mm, and the measured breaking strength per 15 mm width was shown.

(5) Wet tensile strength Measured by a method according to JIS P 8135. (6) Texture The texture was determined by a tactile test by 20 monitors.
In the test method, the composite nonwoven fabric was gripped with fingers, which was judged to be flexible, and one sheet / one person was added to the sheet judged to be good, and the total score was evaluated. (7) Formation The formation was determined by visual sensory evaluation of 20 monitors. In the test method, the formation was visually evaluated by the following five-point evaluation, and judgment was made based on the total score of 20 persons. 5 points: good drilling with uniform openings and no formation disorder 4 points: uneven holes are observed in a very small part, but almost good formation 3 points: There are few disturbances and the holes are almost uniform. 2 points: Uneven holes are seen and the formation is slightly disturbed. 1 point: The holes are uneven and the formation is largely disturbed.

(8) Water Absorption The water absorption was evaluated based on the water retention of the composite nonwoven fabric. The water retention rate was determined according to JIS P 8124 by cutting a composite nonwoven fabric to a size of 10 cm × 10 cm and using four sheets as a sample.
And the weight was measured (W ₀₎ in accordance with, taken out 1 sample was immersed for 1 min at room temperature followed the container 10 liter capacity distilled water are placed 6 liters, then the sample from the water
After dripping water for one minute, the mass (W ₁ ) of the sample was measured, and the water retention rate was determined as {(W ₁ −W ₀ ) / W ₀ } × 100 (%). did. (9) Oil Absorption Oil absorption was evaluated by the oil retention of the composite nonwoven fabric. The evaluation was carried out in the same manner as in (8) Evaluation of water absorption except that white kerosene was used instead of distilled water.

(10) Soil wiping property The dirt wiping property was determined by sensory evaluation by 20 monitors. The test was performed using an ink (TK New Bright, purple, manufactured by Toyo Ink Manufacturing Co., Ltd.) attached to the entire blanket of a printing machine (2800CD type printing machine, manufactured by Ryobi).
The composite nonwoven fabric of 330 mm × 600 mm was folded into eight (165 mm × 150 mm), and white kerosene was
After wiping the sample by infiltrating it into the solution, the wiping property was evaluated. The evaluation was performed by the following five-point evaluation, and the evaluation was made based on the total score of 20 persons. 5 points: Excellent wiping properties 4 points: Excellent wiping properties 3 points: Normal wiping properties 2 points: Poor wiping properties 1 point: Very poor wiping properties ing

(11) Persistence of Streak Unevenness The persistence of streak unevenness was determined by sensory evaluation by 20 monitors. The test method was as follows: composite nonwoven fabric 330 mm x 60
After folding 0 mm into eight pieces (165 mm × 150 mm) and infiltrating 20 ml of white kerosene, the metal roll was wiped, and the wipe line of kerosene remaining on the roll surface was visually evaluated. The following five points were evaluated, and the evaluation was made based on the total score of 20 persons. 5 points: good, no streak unevenness 4 points: very small amount of streak unevenness 3 points: hardly any streak unevenness 2 points: slight streak unevenness 1 point: streaky unevenness conspicuous

Example 2 A composite nonwoven fabric was obtained in the same manner as in Example 1 except for the type of the transfer support net used in the high-pressure water column flow treatment. The supporting pattern was selected and used so that the opening pattern of the composite nonwoven fabric became a finer opening pattern (pattern 2) than in the examples.
The basis weight, thickness, bulkiness, tensile strength,
The wet tensile strength, texture, formation, water absorption, oil absorption, and wiping properties were tested and evaluated by the above-described test methods. The results are shown in Table 1. As the support net for pattern 2, a twill-woven stainless wire having a wire diameter of 0.3 mm and a wire mesh of 40 mesh was used for both the warp and the weft.

Example 3 Modified PET (melting point: 130 ° C.) having a denier of 2 denier and an average fiber length of 51 mm—a PET side-by-side composite type heat-fusible fiber (N784, manufactured by Kuraray Co., Ltd.) was formed into a web by a roller card, and then 135 The web was introduced into a through-air dryer heated to ℃ to obtain a nonwoven fabric having a basis weight of 30 g / m ² . On this nonwoven fabric, a paper sheet obtained by wet papermaking using bleached softwood kraft pulp was laminated. This paper sheet has a basis weight of 50 g / m ² measured by the method described in JIS P 8124 and a density of 0.52 g / c.
m ³ . Next, the paper sheet is positioned on the upper side and the nonwoven fabric is positioned on the lower side of the supporting net for transfer formed of a wire net, and the laminate is transported at a speed of 20 m / min. 60 kg / c using a high-pressure water column jet injector with .15 mm nozzle holes arranged at 1.0 mm intervals
A high-pressure water column flow was injected at a water pressure of m ² , and the paper sheet surface was subjected to a high-pressure water column flow treatment. As described above, the wood pulp fiber constituting the paper sheet and the staple fiber constituting the nonwoven fabric were entangled and integrated to obtain a composite nonwoven fabric. A supporting net was selected and used so that the opening pattern of the obtained composite nonwoven fabric became the same pattern (pattern 1) as in Example 1. Weight, thickness, bulkiness, tensile strength, wet tensile strength, texture, formation, water absorption, oil absorption,
The wiping properties were tested and evaluated according to the test method described above, and the results are shown in Table 1.
It was shown to.

Example 4 Polypropylene (PP) -polyolefin having a fineness of 3 denier and an average fiber length of 45 mm (melting point: 100 ° C.) 50% by weight of a core-sheath composite type heat-fusible fiber (NBF-E, manufactured by Daiwa Spinning Co., Ltd.) And 50% by weight of a polypropylene staple fiber (melting point: 175 ° C.) having a denier of 2 denier and an average fiber length of 51 mm were mixed with a roller card.
The web was introduced into a through-air dryer heated to 0 ° C. to obtain a nonwoven fabric having a basis weight of 20 g / m ² . On this nonwoven fabric, a paper sheet obtained by wet papermaking using bleached softwood kraft pulp was laminated. This paper sheet is JIS
The basis weight measured by the method described in P 8124 is 39 g
/ M ² and the density was 0.52 g / cm ³ . Next, the paper sheet is positioned on the upper side and the nonwoven fabric is positioned on the lower side of the supporting net for transfer formed of a wire mesh, and the laminate is transported at a speed of 30 m / min. .
Using a high-pressure water column jet device having 15 mm nozzle holes arranged at 1.0 mm intervals, a high-pressure water column flow was jetted at a water pressure of 50 kg / cm ² , and the paper sheet surface was subjected to a high-pressure water column flow treatment. As described above, the wood pulp fiber constituting the paper sheet and the staple fiber constituting the nonwoven fabric were entangled and integrated to obtain a composite nonwoven fabric.

As the opening pattern of the obtained composite nonwoven fabric, a support net was selected so as to provide a finer opening pattern (pattern 3) than in Examples 1 to 3. Pattern 3
As the support net, a plain weave stainless wire having a wire diameter of 0.2 mm for both the warp and the weft and a wire mesh of 50 mesh was used. The basis weight, thickness, bulkiness, tensile strength, wet tensile strength, hand,
The formation, water absorption, oil absorption, and wiping properties were tested and evaluated by the following test methods, and the results are shown in Table 1.

Comparative Example 1 A continuous continuous fiber web formed by melt-spinning a polypropylene resin having a melt flow rate of 51 measured by the method described in JIS K 6758 by a spun bond method and accumulating on a collecting surface was heated. It was introduced between the embossed roll and the smoothed roll to obtain a spunbonded nonwoven fabric. A large number of dot-like protrusions were arranged on the embossing roll, and a scattered embossing pattern was formed on the spunbonded nonwoven fabric. The area of the point fusion portion of each emboss pattern is 0.0
A 7 mm ^2, the total area of all embossed proportion of the surface area of the nonwoven fabric was 7 area%. The continuous fine fibers constituting the spunbond nonwoven fabric had an average fineness of 2 deniers and a basis weight of 20 g / m ² . On the surface of this spunbonded nonwoven fabric, a paper sheet obtained by wet papermaking using bleached softwood kraft pulp was laminated. This paper sheet is JIS
The basis weight measured by the method described in P 8124 is 72 g
/ M ² and the density was 0.52 g / cm ³ .

Next, the paper sheet is placed on the upper side, and the spunbonded nonwoven fabric is placed on the lower side, on a transfer conveyor formed of a wire mesh, and the laminate is transferred at a speed of 15 m / min. , One nozzle hole with a hole diameter of 0.15 mm
A high-pressure water column flow was injected at a water pressure of 80 kg / cm ² using a high-pressure water column flow injection device arranged in a zigzag pattern at mm intervals, and the paper sheet surface was subjected to a high-pressure water column flow treatment. As described above, a composite nonwoven fabric was obtained in which pulp fibers constituting the paper sheet and continuous continuous fibers constituting the spunbonded nonwoven fabric were entangled and integrated. The supporting net was selected such that the opening pattern of the obtained composite nonwoven fabric was the same as the opening pattern (pattern 1) in Example 1. The basis weight and thickness of the obtained composite nonwoven fabric,
The bulkiness, tensile strength, wet tensile strength, texture, formation, water absorption, oil absorption, and wiping properties were tested and evaluated by the above-described test methods, and the results are shown in Table 1.

Comparative Example 2 A composite nonwoven fabric was obtained in the same manner as in Example 1 except for the type of the transfer support net used in the high-pressure water column flow treatment. The supporting net was selected so that the opening pattern of the composite nonwoven fabric was the same as that of Example 2 (pattern 2). The basis weight, thickness, bulkiness, tensile strength, wet tensile strength, texture, formation, water absorbency, oil absorbency, and wiping property of the obtained composite nonwoven fabric were tested and evaluated by the above-described test methods, and the results were tabulated. 1 is shown.

[0045]

[Table 1]

As can be seen from Table 1, the composite nonwoven fabric according to the present invention is excellent in formation and remaining unevenness in stripes (Examples 1 to 4). In particular, with regard to formation, no disorder of formation was observed on the surface of the composite nonwoven fabric of the present invention, but when a spunbonded nonwoven fabric was used, the film-like point-welded portion generated by the hot embossing treatment was used. There is a disorder of formation due to this, which deteriorates the whole formation (Comparative Examples 1 to 5).
2). In addition, due to the disorder of the formation, a liquid that cannot be absorbed when the liquid is wiped off is generated, and the stripe unevenness persistence is poor. As for the texture and wiping properties, the composite nonwoven fabric of the present invention slightly obtained better results than the composite nonwoven fabric according to the conventional method. Although this difference is a level at which there is no problem in practical use, it is considered that this difference is also due to a difference in surface properties due to superiority and inferiority of formation. In other words, in the evaluation of formation, the surface with a uniform opening and no disturbance was felt smoother, and the wiping property was evaluated by the presence or absence of exposure of the film-like point fusion part. Conceivable. Regarding thickness, bulkiness, tensile strength, wet tensile strength, water absorption, and oil absorption, no significant difference is observed between the present invention and the composite nonwoven fabric according to the conventional method. It shows that it has sufficient performance and there is no problem at all.

[0047]

Industrial Applicability The present invention is excellent in uniformity of opening and formation, excellent in texture, wiping property, and remaining of unevenness in stripes, etc., and is used for a wiper for an automatic blanket washing machine of an offset printing press and a clean room. The present invention provides an advantageous effect of providing a composite nonwoven fabric which can be suitably used for industrial wiper applications such as wipers and industrial rags, or so-called wiping cloth applications such as wet tissues, towels and disposable towels, and a method for producing the same.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-270361 (JP, A) JP-A-5-285083 (JP, A) JP-A-5-277053 (JP, A) 146257 (JP, A) JP-A-3-231666 (JP, A) JP-A-2-127551 (JP, A) JP-A-60-183139 (JP, A) JP-A-54-82481 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 A47L 13/16

Claims (2)

(57) [Claims] 1. A fiber web formed by stacking staple fibers of a heat-fusible fiber alone or a mixture of a heat-fusible fiber and a non-heat-fusible fiber in a sheet form, wherein the fibers constituting the heat-fusible fiber are heat-fusible fibers. The nonwoven fabric partially fused and joined by the fusible fiber and the paper sheet made of wood pulp fiber are laminated, and the wood pulp fiber constituting the paper sheet and the non-fused fiber are combined. A composite nonwoven fabric which is three-dimensionally entangled and integrated by a high-pressure water column flow treatment and has an opening pattern by the high-pressure water column flow. 2. A staple fiber of a heat-fusible fiber alone or a mixture of a heat-fusible fiber and a non-heat-fusible fiber is accumulated in a sheet form to form a fibrous web, which is then heated and heat-fused. The low melting point component of the conductive fiber is partially melted, and the fibers are fused and bonded at the intersection of the constituent fibers into a nonwoven fabric, and a paper sheet made of wood pulp fiber is laminated thereon, and A high-pressure water column flow is injected so as to penetrate the nonwoven fabric side, and the staple fiber constituting the nonwoven fabric and the pulp fiber constituting the paper sheet are three-dimensionally entangled and integrated, and simultaneously, the composite nonwoven fabric obtained by the high-pressure water column flow A method for producing a composite nonwoven fabric, characterized in that an opening pattern is formed on the nonwoven fabric.