JP2003041472A - Thin, light-weight and reinforced nonwoven fabric entangled by water current - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin, light-weight and reinforced nonwoven fabric entangled by a water current, having excellent strength balance and elongation balance in the machine direction and the transverse direction, good touch feeling, good air permeability and soft feeling, and further having uniform and dense feeling, and excellent appearance regardless of the light weight. SOLUTION: This thin, light-weight and reinforced nonwoven fabric entangled by the water current is obtained by entangling and integrating a wet web layer, with a reinforcing supporter by the high-pressure water current. The wet web layer is obtained by wet papermaking method and comprises fibers having <=10 μm fiber diameters. The reinforcing supporter comprises an oriented and crossed, laminated nonwoven fabric obtained by orienting filamentous nonwoven fabrics obtained by spinning a thermoplastic resin in one direction, and laminating the obtained filamentous nonwoven fabrics so that the oriented axes of the filaments of the filamentous nonwoven fabrics may be crossed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced water flux which is excellent in flexibility, touch and breathability, is thin and lightweight, has a uniform surface property, and has improved longitudinal and lateral strength and elongation balance. It relates to synthetic nonwoven fabric. More specifically, it relates to a thin and lightweight reinforced hydroentangled nonwoven fabric widely used for clothing products such as interlining, industrial materials such as filters and industrial wipers, and medical disposable products such as surgical clothes, sheets, towels and masks. Is.

[0002]

2. Description of the Related Art A method of intertwining fibers forming a web with each other by jetting a high-pressure fluid onto a short fiber web to give an appropriate entanglement structure and specific physical properties to the web is known as a hydroentanglement method. Widely implemented. The non-woven fabric produced by the hydroentangling method has a high degree of freedom in moving the fibers relative to each other as compared with other non-woven fabrics because there is no bonding point between the fibers, and thus has a high flexibility and a soft texture. However, since the fibers are not bonded to each other, the strength is weak and the elongation is large, so there is a problem that they are unstable and easily deformed. This problem can be improved to some extent by increasing the basis weight of the web, but by increasing the basis weight, it is no longer a thin and lightweight type, and the breathability of the entire nonwoven fabric is reduced and the breathability is reduced. The drawback is that it gets worse. Further, since the injection traces of the high-pressure fluid remain continuously in the vertical direction (flow direction) of the web, there is a problem that the strength balance and the elongation balance in the vertical and horizontal directions are poor.

As a method for improving such problems,
A method of entanglement of a short fiber web with a reticulate material
No. 263660) and a method of entanglement of a spunbonded nonwoven fabric with a short fiber web (Japanese Patent Laid-Open No. 6-240553). However, in any of the improved methods using a reinforced support found in these disclosed techniques, the objects of reinforcement and dimensional stability are achieved, but the softness, soft texture, etc., which are the characteristics of hydroentangled nonwoven fabrics, are maintained. In addition, it is difficult to obtain a water flow nonwoven fabric that is thin and lightweight and has an excellent balance of strength and elongation. Further, there is known a non-woven fabric in which a stretched cross-laminated non-woven fabric is used as a reinforcing support and the short fiber web layer produced by a card machine is integrated by hydroentanglement. In this case, a nonwoven fabric excellent in strength balance and flexibility can be obtained, but it is possible to form a short fiber web that is thin and lightweight and has a uniform texture by using a card machine by using short fiber having a small diameter. Since it is difficult, the resulting non-woven fabric has a problem that it is inferior in touch and surface appearance.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention is excellent in flexibility, touch and breathability, is thin and lightweight, and has a uniform surface property. An object is to provide a nonwoven fabric excellent in strength balance and elongation balance.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above-mentioned problems, and as a result, found that a specific web layer and a specific reinforcing support obtained by a wet papermaking method have a high-pressure water flow. The thin, lightweight non-woven fabric that has been entangled and integrated with each other has improved strength and elongation balance in the longitudinal and transverse directions, has not only a soft texture, etc., but also has good touch and breathability, and is lightweight, yet uniform. A thin, lightweight reinforced hydroentangled non-woven fabric has been found, which is characterized by its compactness and excellent appearance. The present invention has been achieved based on these findings.

That is, the first invention of the present application is a thin lightweight reinforced hydroentangled nonwoven fabric characterized in that the wet web layer obtained by wet papermaking and the reinforced support are entangled by a high-pressure water flow and integrated. The wet web layer contains 20 to 100% by mass of fibers having a fiber diameter of 10 μm or less, and the fibers constituting the wet web layer are entangled with each other, and the reinforced support is thermoplastic. Stretched cross-laminated nonwoven fabric obtained by stretching a long-fiber nonwoven fabric (long-fiber web layer) spun from a resin in one direction, and laminating the long-fiber nonwoven fabric (long-fiber web layer) such that the fiber arrangement axes intersect each other. (Web) is a thin, lightweight reinforced hydroentangled nonwoven fabric.

The second invention of the present application is the same as the first invention.
The wet web layer is a natural fiber with a fiber length of 2 to 15 mm.
Made of fiber, recycled fiber or synthetic fiber, and basis weight 3g
/ M ^TwoThe thin and lightweight hydroentanglement feature characterized above
It is a woven cloth.

According to a third invention of the present application, the reinforced support according to the first invention comprises fibers having a draw ratio of 3 to 20 and an average fineness of 0.01 to 11 decitex, and
A thin, lightweight, reinforced hydroentangled nonwoven fabric characterized by being a long fiber nonwoven fabric having a basis weight of 2 g / m ² or more spun from a thermoplastic resin.

Further, in the fourth invention of the present application, the wet web layer and the reinforced support are entangled by a high-pressure water flow, and the basis weight of the whole nonwoven fabric integrated is less than 100 g / m ² , and the longitudinal strength and The ratio of lateral strength (longitudinal strength / lateral strength) and the ratio of longitudinal elongation to lateral elongation (longitudinal elongation / lateral elongation) are 0.5 to 2.
It is a thin lightweight reinforced hydroentangled nonwoven fabric characterized by being in the range of 0.

Further, in the fifth invention of the present application, the wet web layer and the reinforced support are entangled with each other by a high-pressure water stream, and the Frazier air permeability of the whole nonwoven fabric integrated is 15 cc / cm ^2.
-A thin, lightweight reinforced hydroentangled nonwoven fabric characterized by having a length of not less than sec.

The present invention will be described in more detail below. The types of fibers used in the wet web layer of the present invention include, for example, polyester-based fibers, polyolefin-based fibers, polyacrylonitrile-based fibers, polyvinyl alcohol-based fibers, nylon fibers, organic synthetic fibers such as elastomer fibers such as urethane, and the like. Fibers such as regenerated fiber, semi-synthetic fiber and natural fiber can be mentioned. The polyester fiber means a fiber made of homopolymers and copolymers such as polyethylene terephthalate, polybutylene terephthalate, and modified polymers of these polymers. Polyolefin fiber refers to fibers made of homopolymers and copolymers such as polypropylene, polyethylene, polystyrene, and modified polymers thereof. Polyacrylonitrile fiber refers to acrylic fiber, modacrylic fiber, and the like. Polyvinyl alcohol fiber means a fiber made of polyvinyl alcohol. Nylon fibers are fibers made of polymers such as nylon 6, nylon 66, nylon 12, and the like. The elastomer fiber such as urethane refers to a polyurethane-based or polyester-based elastic fiber. Semi-synthetic fibers are fibers such as acetate fibers. The regenerated fiber means a regenerated cellulosic fiber such as viscose rayon, polynosic rayon, lyocell or the like, which is prepared by spinning a solution of collagen, alginic acid, chitin and the like. Natural fibers refer to cellulosic fibers such as hemp and cotton, and protein fibers such as wool and silk.

The fibers used in the present invention are synthetic fibers,
In the case of a semi-synthetic fiber, it may be in the form of a composite fiber composed of two or more kinds of the above polymers. The cross-sectional shape of the fiber is not only circular, elliptical, but also flat, triangular, Y-shaped,
It may have a so-called atypical cross-sectional shape such as a T-shape, a U-shape, a star shape, and a dogbone shape. The fibers constituting the wet web layer of the present invention are the above fibers alone or a mixture thereof. Naturally, in addition to the above fibers, a small amount of fibers other than those limited in the present invention can be contained in the nonwoven fabric, but it should not be in a range that impairs the performance of the nonwoven fabric of the present invention.

The wet web layer of the present invention is required to form a uniform and dense layer for obtaining a thin and lightweight non-woven fabric while maintaining the flexibility of the present invention. For that purpose, it is essential to use ultrafine fibers having a specific small fiber diameter and to make a uniform web having a uniform basis weight. The single fiber diameter of the fiber is preferably 10 μm or less, and more preferably 1 to 8 μm. When the fiber diameter exceeds 10 μm, the texture and the touch are deteriorated, which is not preferable. Further, although it is possible to mix fibers having a fiber diameter of 10 μm or more in the wet web layer of the present invention, 20 to 100% by mass of fibers having a fiber diameter of 10 μm or less is contained with respect to the mass of the nonwoven fabric. preferable. When it is less than 20% by mass, not only the surface property of the non-woven fabric is deteriorated but also the texture and touch of the non-woven fabric are deteriorated, which is not preferable. Further, a wet web is preferable as a web having excellent uniformity and having a uniform basis weight even with a low basis weight. The wet web is a web obtained by a wet papermaking method, and is the most suitable method for dispersing fibers in water to form a uniform web. With other dry methods such as the card method, it is difficult to obtain a uniform web, and it is also difficult to use fibers having a small fiber diameter of 10 μm or less.

The fiber length of the ultrafine fibers used in the wet web layer of the present invention is preferably 2 to 15 mm, more preferably 3 to 10 mm. Even if the fiber length is less than 2 mm, the fibers penetrate into the structure of the reinforced support and the objective of composite integration with the reinforced support can be achieved, but the entanglement of the fibers in the wet web layer becomes weak and the durability is improved. Inferior in nature. If it exceeds 15 mm, a large amount of energy is required for entanglement with the reinforced support, and the texture of the nonwoven fabric is deteriorated, which is not preferable.
The basis weight of the wet web layer is preferably 3 g / m ² or more, more preferably 5 g / m ² or more. Basis weight is 3g /
If it is less than m ² , the surface of the reinforced support is exposed during high-pressure water flow treatment, which is not preferable.

Next, the reinforced support used in the present invention will be described. The long fibers used in the present invention may be pre-stretched, but it is preferable that they can be further stretched twice or more. Various methods are used as the method for forming the long-fiber nonwoven fabric of the present invention, and the spinning filaments of the thermoplastic resin are swirled or vibrated by hot air to be aligned longitudinally or laterally, and almost all of the fibers are unidirectionally arranged. A method of forming an arrayed non-woven fabric, a method of spinning a thermoplastic resin and performing stretching, opening, collection and entanglement to form a non-woven fabric (for example, the spunbond method), and injecting a thermoplastic resin with high temperature and high pressure air A method of forming a nonwoven fabric by spreading and arranging the fibers (for example, a melt blown method), a method of stretching and crimping a long fiber bundle of a thermoplastic resin, and performing opening and widening to form a nonwoven fabric (for example, a tow opening method. ), Foaming extrusion of a thermoplastic resin, foaming bursting, lamination and spreading to form a nonwoven fabric (for example, burst fiber method).

In the present invention, as a reinforcing support, a stretched cross-laminated non-woven fabric is obtained by stretching a long-fiber non-woven fabric spun from a thermoplastic resin in one direction and laminating the long-fiber non-woven fabric so that the alignment axes of the long fibers cross each other. To use. The stretching of the present invention includes rolling treatment. As the stretching means, the longitudinal stretching means, the horizontal stretching means and the biaxial stretching means which have been used for stretching conventional films and nonwoven fabrics can be used. That is, as the longitudinal stretching means, roll-to-roll proximity stretching is preferable because stretching can be performed without reducing the width. In addition, roll rolling, hot air drawing, hot water drawing, steam drawing and the like can be used. As the transverse stretching means, a tenter method used for biaxial stretching of a film can be used, but a pulley type transverse stretching method exemplified in Japanese Patent Publication No. 3-36948 and a transverse stretching in which groove rolls are combined. The method (groove roll method) is simple. As the biaxial stretching means, a tenter type simultaneous biaxial stretching method used for biaxial stretching of a film can be used, but it can also be achieved by combining the longitudinal stretching means and the transverse stretching means. The stretched unidirectionally arranged nonwoven fabric has a stretch ratio of 3 to 20 times, preferably 5 to 12 times. The average fineness of the stretched nonwoven fabric is 0.01 to 11 decitex, preferably 0.03 to 5.5 decitex. The basis weight of the reinforced support in the present invention is preferably 2 g.
/ M ² or more, more preferably 5 g / m ² or more. When the basis weight is less than 2 g / m ² , the nonwoven fabric after hydroentanglement with the wet web layer is poor in longitudinal strength and transverse strength balance and elongation balance, which is not preferable.
Further, as the reinforced support, a nonwoven fabric formed by stretching and arranging long fibers spun from a thermoplastic resin in the longitudinal direction and a nonwoven fabric formed by stretching and arranging the long fibers in the transverse direction are aligned and laminated. Nonwoven fabrics, cross-laminated nonwoven fabrics thereof, and biaxially stretched long-fiber nonwoven fabrics can be used.

Examples of the thermoplastic resin used as the raw material for the long-fiber nonwoven fabric used in the present invention include high-density, medium-density and low-density polyethylene, linear low-density polyethylene, ultra-low-density polyethylene, polypropylene and propylene-ethylene copolymer. The propylene-based polymer, the α-olefin polymer, the polyamide, the polyester, the polycarbonate, the polyvinyl alcohol and the like are listed, but polypropylene and polyester are particularly preferable. It is also possible to add an antioxidant, an ultraviolet absorber, a lubricant, etc. to the resin for use.

The combination of the wet web layer composed of natural fibers, regenerated fibers or synthetic fibers in the present invention and the reinforced support includes the wet web layer (A) and the reinforced support (B).
It is possible to use two or more layers in which the above are alternately stacked. Within the range that does not impair the performance of the nonwoven fabric of the present invention, for example, A / B, A / B / A, B / A / B, A / B
Any combination such as / A / B is possible. However, a combination in which the wet web layer is on the surface is preferable from the feel of the nonwoven fabric. Further, the basis weight of the whole nonwoven fabric in which the wet web layer and the reinforcing support are laminated is preferably 100.
It is less than g / m ² . When the basis weight is more than 100 g / m ² , not only the thinness and lightness and the air permeability are deteriorated, but also the texture becomes hard, which is not preferable.

The ratio of longitudinal strength to lateral strength (longitudinal strength / lateral strength) and the ratio of lateral elongation to longitudinal elongation (lateral elongation / longitudinal elongation) of the thin lightweight reinforced hydroentangled nonwoven fabric of the present invention are preferable. Is 0.5
To 2.0, and more preferably 0.7 to 1.5. If the ratio of the longitudinal strength to the transverse strength and the ratio of the longitudinal elongation to the lateral elongation are less than 0.5 or more than 2.0, the dimensional stability becomes poor and the deformation tends to be biased, which is not preferable. . The strength and elongation referred to here are the values obtained by the tensile strength and elongation test methods described in JIS L1096.

The Frazier air permeability of the thin, lightweight, reinforced hydroentangled nonwoven fabric of the present invention is preferably 15 cc / cm ² · sec.
Or more, more preferably 25 cc / cm ² · sec or more. Frazier breathability of the whole non-woven fabric is 15cc / cm
^If it is lower than ² · sec, the air permeability is poor, so that it is not suitable for clothing applications requiring stuffiness prevention and filter applications requiring air permeability, which is not preferable.

Next, the method for producing the thin lightweight lightweight reinforced hydroentangled nonwoven fabric of the present invention will be described in detail. First, a method for manufacturing a wet web layer will be described. As a specific example of manufacturing the wet web layer, an example of a wet papermaking method will be described. First, the ultrafine fibers are disintegrated in water, then a uniform dispersion is prepared, and a web is produced using a paper machine. For disintegration of ultrafine fibers, a beater such as a pulper or beater can be used. However, in order to prevent the fibers from being entangled with each other and the fibers from being damaged by the disintegration work for a long time, it is preferable that the disaggregation be performed in the shortest possible time. In this process, it is important to minimize the fiber bundles and disperse them into single fibers. Immediately transfer the disaggregated fiber dispersion to a gentle agitator, etc.,
A fiber suspension (slurry) in a uniformly dispersed state is prepared by diluting as needed and adding a viscous agent such as a polymer polyacrylamide solution or a polyethylene oxide solution as appropriate. For fibers that are easily disintegrated, a method of dispersing the fibers only by stirring with an agitator is preferable. It is preferable that the blade of the agitator such as an agitator is as thick and round as possible so that the fibers do not become entangled. Using the slurry thus prepared, a wet web layer can be obtained by using a paper machine having at least one wire such as a cylinder, a Fourdrinier, a shortdrinier and an inclined wire.
At this time, a small amount of binder may be applied to the wet web layer before entanglement, temporary adhesion may be performed, and the wound web layer may be once wound and then laminated with the reinforced support for entanglement. However, as the binder to be used, a binder whose adhesion is released by entanglement is preferable. For example, water-soluble polyvinyl alcohol, carboxymethyl cellulose, etc. are exemplified. Further, the binder component remaining on the web can be further removed by a method such as washing with water or washing with hot water, if necessary.

The laminated body of the wet web layer and the reinforced support prepared as described above is loaded on the porous support, and the porous support is relatively moved, and a column of high pressure is applied from above the laminated body. The water stream is jetted and entanglement processing is performed. As the porous support, a plain weave, a twill weave stainless steel or a plastic wire of about 20 to 200 mesh,
A punching plate or the like that has been perforated may be used. At this time, it is preferable that the columnar water stream is one ejected from an orifice (nozzle) having a diameter of 150 μm or less, and the distance between the water streams is 2 mm or less. Pressure is 9.8 × 10 ⁵
˜2.9 × 10 ⁷ Pa, preferably 3 × 10 ^{6 to} 2.5.
× 10 ⁷ Pa, more preferably 4.9 × 10 ^{6 to} 2.0.
It is possible to process in the range of × 10 ⁷ Pa. If the nozzle diameter is larger than 150 μm or the distance is wider than 2 mm, not only the trace of water flow will be noticeable but the surface quality and appearance will be deteriorated, and the touch feeling will be deteriorated. Pressure is 9.8 × 1
When it is lower than 0 ⁵ Pa, although the fibers move, the entanglement of the fibers is insufficient and a difference in fiber density appears due to the movement, so that the surface property and the tactile sensation deteriorate. Further, when the pressure is higher than 2.9 × 10 ⁷ Pa, the fibers themselves are entangled with each other and the fibers themselves are destroyed at the same time, so that the wet web layer is partially broken and the strength and surface property are deteriorated. . As a method of moving the web and the high-pressure water flow relatively, a method of moving the porous support is convenient. At this time, the transport speed of the support is 2 to 200 m / min, preferably 5 to 10
It can be used in the range of 0 m / min.

In addition to the above, it is important for the entanglement method to select the number of nozzle heads and the number of entanglements within a range in which sufficient entanglement can be obtained in consideration of the type of wet web layer, basis weight, processing speed, and water pressure. Is. Further, as a method of improving the surface quality, the nozzle diameter and the nozzle interval are individually reduced or both of them are sequentially decreased, the head of the nozzle is rotationally moved, left and right are vibrated, or the web support is vibrated left and right. There are such things. Further, after the entanglement, a wire mesh of 40 to 100 mesh is inserted between the nozzle and the web, and the columnar water stream is sprinkled to be sprayed on the web to improve the surface quality. In addition, entanglement can be performed on only one side or both sides, but in order to reduce the difference between the front and back,
It is preferable to perform double-sided entanglement. Further, after the entanglement, the webs may be further laminated to perform the entanglement.

The web thus entangled is entangled or after entanglement to remove excess water by suction or a wet press, and then air dryer, air through dryer, or suction. Drying can be performed using a drum dryer or the like.

Of course, it is possible to entangle other non-woven fabrics such as dry non-woven fabrics, pulp sheets, wet non-woven fabrics containing fibers deviated from the claims of the present invention with one side, both sides or a sandwich. It goes without saying that it should not be in a range that hinders the object of the present invention.

[0026]

The thin and lightweight reinforced hydroentangled nonwoven fabric of the present invention is obtained by unidirectionally stretching a wet web layer composed of fibers having a fiber diameter of 10 μm or less obtained by a wet papermaking process and a long fiber nonwoven fabric spun from a thermoplastic resin. And a reinforced support made of a stretched cross-laminated nonwoven fabric laminated such that the fiber arrangement axes of the long-fiber nonwoven fabric intersect with each other by high-pressure water flow. The thin lightweight reinforced hydroentangled nonwoven fabric of the present invention has excellent strength balance and elongation balance in the machine direction and the transverse direction, and also has a good tactile feel and has a soft texture, while being lightweight, It has the characteristics of being uniform and dense and having an excellent appearance.

[0027]

EXAMPLES The thin and lightweight reinforced hydroentangled nonwoven fabric of the present invention will be described below with reference to examples, but the present invention is not limited to these examples. “Part” and “%” in the examples
Means "parts by mass" and "mass%", respectively.

Physical properties in Examples and Comparative Examples were measured by the following methods. 1) <Basis weight> It was measured by the method described in JIS L1096. The unit is g / m ² . 2) <Strength, strength balance, elongation balance> The tensile strength and elongation in the longitudinal and transverse directions were measured according to the method described in JIS L1096. However, the sample has a width of 50 mm and a length of 200 mm, and the grip interval is 100 m.
Five samples were measured for each m and the average value was shown. The unit is N / 50 mm. The strength balance was calculated from the ratio of longitudinal strength to lateral strength (longitudinal strength / lateral strength), and the elongation balance was calculated from the ratio of lateral elongation to longitudinal elongation (lateral elongation / longitudinal elongation). 3) <Breathability> Measured by the method described in JIS L1096. The unit is cc / cm ² · s. 4) <Tactile sensation, texture> Sensory evaluation was performed. Good was judged good, good was judged fair, and bad was bad. 5) <Surface uniformity> Evaluation was performed visually. The case where the surface was uniform was evaluated as ◯, the case where the reinforced support was about to be exposed was evaluated as Δ, and the case where the reinforced support was exposed was evaluated as x.

<Example 1> Fiber diameter 3.2 μm, fiber length 5
mm polyester fiber was uniformly disaggregated and dispersed in water using a pulper to prepare a suspension having a concentration of 1%, and then the suspension was used to obtain a dry basis weight of 10 g / m ^2. Papermaking was carried out to obtain a wet web layer (W1). Polyethylene terephthalate (PET) resin (trade name: MA
2100, manufactured by Unitika Ltd.) is used as a raw material, and the melt-spun filaments ejected from the spinneret are swirled by hot air and arranged in the longitudinal direction, and are accumulated on a reciprocating mesh endless belt conveyor to obtain a fineness of 2 A long fiber non-woven fabric in which undrawn filaments of 2 decitex were arranged in the longitudinal direction was obtained. Then, this non-woven fabric is stretched in the machine direction by stretching the rolls close to each other.
The fiber was stretched 0 times to have a fineness of 0.22 decitex, and was temporarily bonded with polyvinyl alcohol to obtain a longitudinally stretched unidirectionally arranged long fiber nonwoven fabric (A) having a basis weight of 5 g / m ² . Further, the same resin was spun in the same manner to prepare a long-fiber nonwoven fabric arranged in the transverse direction, and stretched 10 times in the transverse direction by a pulley-type transverse stretching method to obtain a fineness of 0.22 decitex, and temporary adhesion with polyvinyl alcohol was performed. Thus, a laterally stretched unidirectionally aligned long fiber nonwoven fabric (B) having a basis weight of 5 g / m ² was obtained. Nonwoven fabric A and nonwoven fabric B were laminated in a direction orthogonal to each other and heat embossed to obtain a stretched cross-laminated nonwoven fabric (C) having a basis weight of 11 g / m ² . This non-woven fabric (C) was used as a reinforcing support. The web layer and the reinforced support were superposed so that the layer structure was W1 / C / W1, and were stacked on a 76-mesh plain-woven plastic wire, and pressure (8. Entangling was performed at 8 × 10 ⁶ Pa) and an entangling speed of 15 m / min. Further, the web was turned over, and the water was jetted under the same conditions to carry out the entanglement. Nozzle diameter and nozzle spacing,
The nozzle arrangement is shown below. The first row has a nozzle diameter of 120
μm, nozzle spacing 1.2 mm, staggered in two rows, second
In the third row, the nozzle diameter is 100 μm and the nozzle interval is 0.6 mm, and one row is straight. In the third row, the nozzle diameter is 100 μm, and the nozzle interval is 0.6 mm, which is one straight row. continue,
After squeezing the water with a padder, use an air dryer to
It was dried at 20 ° C. to obtain a thin and lightweight reinforced hydroentangled nonwoven fabric.

<Example 2> Fiber diameter 7.2 μm, length 3 m
m polyester fiber, and using the same method as in Example 1, dry basis weight 10 g / m ² polyester wet web layer (W
2) was obtained. Using this web layer (W2) and the reinforced support (C), hydroentangling treatment was performed under the same conditions as in Example 1.

Example 3 Fiber diameter 7.2 μm, length 10
A polyester wet web layer (W3) having a dry basis weight of 10 g / m ² was obtained by the same method as in Example 1 using mm of polyester fiber. Using this wet web layer (W3) and the reinforced support (C), hydroentangling treatment was performed under the same conditions as in Example 1.

Example 4 Fiber diameter 7.2 μm, length 5 m
A polyester wet web layer (W4) having a dry basis weight of 10 g / m ² was obtained by the same method as in Example 1 using 70 parts of m polyester fiber, 30 parts of polyester fiber having a fiber diameter of 12 μm and a fiber length of 10 mm. This wet web layer (W4)
Using the reinforced support (C), hydroentangling treatment was performed under the same conditions as in Example 1.

<Example 5> Fiber diameter 3.2 μm, length 5 m
m polyester fiber, and using the same method as in Example 1, dry basis weight 20 g / m ² polyester wet web layer (W
5) was obtained. This wet web layer (W5) and a reinforced support (C1) having a basis weight of 30 g / m ² obtained in the same manner as in Example 1
Using pressure (1.6 × 10 ⁷ Pa), confounding speed 15
The hydroentangling treatment was performed under the confounding condition of m / min.

Example 6 Fiber diameter 3.2 μm, length 5 m
Polyester wet web layer (W having a dry basis weight of 40 g / m ²⁾ (W
6) was obtained. This wet web layer (W6) and a reinforced support (C1) having a basis weight of 30 g / m ² obtained in the same manner as in Example 1
Using, pressure (2.2 × 10 ⁷ Pa), confounding speed 15
The hydroentangling treatment was performed under the confounding condition of m / min.

<Comparative Example 1> Three wet webs (W1) were stacked without using the reinforced support (C), and hydroentangling treatment was performed under the same conditions as in Example 1.

<Comparative Example 2> Fiber diameter 3.2 μm, fiber length 5
A polyester wet web layer (W7) having a dry basis weight of 70 g / m ² was obtained in the same manner as in Example 1 using mm of polyester fiber. Without using the reinforced support (C), pressure (1.6 × 10 ⁷ Pa) and confounding speed 15 m / m
The hydroentangling treatment was performed under in-entanglement conditions.

Comparative Example 3 Fiber diameter 12.4 μm, length 1
A polyester wet web layer (W8) having a dry basis weight of 10 g / m ² was obtained in the same manner as in Example 1 by using 0 mm polyester fiber. Using this web layer (W8) and the reinforced support (C), hydroentangling treatment was performed under the same conditions as in Example 1.

<Comparative Example 4> Fiber diameter 14.3 μm, length 5
Using 0 mm polyester fiber, average basis weight 10 g / m
^Two webs were two-dimensionally arranged by a card parallel method to obtain a web layer (W9). This web layer (W
Using 9) and the reinforced support (C), hydroentangling treatment was performed under the same conditions as in Example 1.

<Comparative Example 5> Fiber diameter 16.0 μm, length 5
Using a split type fiber made of polyester and nylon, which is 0 mm and is divided into 20 by hydroentangling, webs having an average basis weight of 10 g / m ² are two-dimensionally arranged by a card parallel method to form a web layer (W10). Obtained. Using this web layer (W10) and the reinforced support (C), hydroentangling treatment was performed under the same conditions as in Example 1. The fiber diameter of each fiber split by hydroentangling was 3.2 μm for polyester fibers and 3.5 μm for nylon fibers.

The results of each physical property are shown in Table 1.

[Table 1]

From the results of Example 1 and Comparative Example 1, and of Example 5 and Comparative Example 2, when comparing non-woven fabrics having the same basis weight, the wet web layer obtained by wet papermaking and the reinforced support have a high pressure water flow. In the non-woven fabric of this example entangled and integrated with each other, compared to the non-woven fabric in which only the wet web layer is entangled by the high-pressure water flow, not only the strength in the vertical and horizontal directions is strong, but also the strength balance and the elongation balance in the vertical and horizontal directions. It was excellent and not only had good dimensional stability, but also excellent breathability. Also,
From Example 6, when the total grammage exceeds 100 g / m ² , the air permeability and the texture are slightly lowered, but the strength is very excellent. According to Comparative Example 3, when the wet web layer is composed only of fibers having a fiber diameter of 10 μm or more, the elongation balance and air permeability are excellent due to the entanglement with the reinforced support, but the texture and feel are greatly reduced. It ended up being something. Further, from Comparative Examples 4 and 5, when a web layer obtained by a card parallel method was used in place of the wet web layer, it was difficult to produce a uniform card web, and as a result, the surface after high-pressure water flow was obtained. The property was inferior to that of this example.

Example 7 Fiber diameter 6.9 μm, length 8 m
m rayon fiber was used and dried in the same manner as in Example 1.
Amount 15g / m^TwoPolypropylene wet web layer (W1
1) was obtained. Polypropylene resin (density 0.90 g / c
m³, Melt flow rate 700g / min) as raw material
Then, spinning is performed in the same manner as in Example 1, and the fineness is 2.2 d
Of unstretched filaments arranged in a longitudinal direction
After obtaining the long fiber non-woven fabric, the non-woven fabric was treated in the same manner as in Example 1.
Stretch in the machine direction to a fineness of 0.22 decitex,
6g / m2 basis weight after temporary adhesion with livinyl alcohol
^TwoA longitudinally stretched unidirectionally arranged long fiber nonwoven fabric (A2) was obtained. Well
And obtained in the same manner as in Example 1 from the above raw materials and arranged in the lateral direction.
The long-fiber non-woven fabric was stretched in the transverse direction in the same manner to obtain a fineness of 0.
22 decitex, temporary with polyvinyl alcohol
Bonded to a basis weight of 6 g / m^TwoHorizontally unidirectionally arranged long fibers
A non-woven fabric (B2) was obtained. Nonwoven fabric A2 and nonwoven fabric B2
Laminate them in a direction orthogonal to each other, and temporarily use polyvinyl alcohol.
Bonded and basis weight 13g / m^TwoStretched cross-laminated nonwoven fabric (C
2) was obtained. This non-woven fabric (C2) is used as a reinforced support.
I used it. Wet web layer (W11) and reinforced support (C
2) using pressure (1.1 x 10 ⁷Pa), confounding speed
The hydroentangling treatment was performed under the entanglement condition of 15 m / min.

<Comparative Example 6> Fiber diameter 6.9 μm, length 8 m
A rayon wet web layer (W12) having a dry basis weight of 40 g / m ² was obtained in the same manner as in Example 6 using m rayon fibers. This wet web layer (W12) is provided with a reinforced support (C
Without using 2), the hydroentangling treatment was performed under the entanglement conditions of pressure (1.1 × 10 ⁷ Pa) and entanglement speed of 15 m / min.

The results of each physical property are shown in Table 2.

[Table 2] According to Table 2, even when a recycled fiber such as rayon is used in addition to the synthetic fiber, the one of the present example similarly has an excellent longitudinal / horizontal strength balance and elongation balance, and has a good texture.
It was found to have touch and surface properties.

[0045]

The thin, lightweight reinforced hydroentangled nonwoven fabric obtained by the present invention is excellent not only in tensile strength, longitudinal and transverse strength, and elongation balance, but also in soft texture, texture,
It has excellent breathability, clothing products such as interlinings that make use of reinforcing functions and expansion and contraction direction control functions, industrial materials such as filters and industrial wipers, and medical disposable products such as surgical clothes, sheets, towels and masks. Widely used for etc.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mitsuo Yoshida             Mitsubishi 3-4-2 Marunouchi, Chiyoda-ku, Tokyo             Paper Manufacturing Co., Ltd. (72) Inventor Jun Yamada             1-1-4 Ikeda-cho, Yokosuka City, Kanagawa Prefecture (72) Inventor Takeo Kasuhara             5-27-1-112, Kugahara, Ota-ku, Tokyo F-term (reference) 4F100 AJ01A AJ05A AK01A AK01B                       AK01C AK42 BA03 BA04                       BA10A BA10B BA22 DG03A                       DG04B DG04C DG15A DG15B                       DG15C DG17A EC09A EJ37B                       EJ37C GB66 GB72 JA13A                       JD02 JJ00 JK02 JK08 YY00A                       YY00B YY00C                 4L047 AA07 AA12 AA21 AB02 AB03                       AB07 BA04 BA12 BA21 BC05                       BD02 CA02 CA05 CA19 CB01                       CB08 CC02 CC12                 4L055 AF10 AF33 AF35 AJ01 BE14                       BE20 EA08 EA09 EA16 EA32                       FA13 FA18 GA26 GA29 GA31                       GA39

Claims (5)

[Claims] 1. A thin and lightweight reinforced hydroentangled nonwoven fabric, wherein a wet web layer obtained by a wet papermaking method and a reinforced support are entangled by a high-pressure water stream, and the wet web layer has a fiber diameter of 10 μm or less. 20 to 100% by mass of fiber
The reinforced support comprises a long-fiber nonwoven fabric stretched in one direction such that the fiber-arrangement axes of the long-fiber nonwoven fabric cross each other. A thin and lightweight reinforced hydroentangled non-woven fabric, which is a stretched cross-laminated non-woven fabric. 2. The wet web layer has a fiber length of 2 to 15 m.
m of natural fiber, recycled fiber or synthetic fiber and having a basis weight of 3 g / m ² or more.
The thin, lightweight hydroentangled nonwoven fabric described in. 3. The stretch ratio of the reinforced support is 3 to 20.
Twice, the average fineness is 0.01 to 11 decitex fibers, and the basis weight spun from a thermoplastic resin is 2 g / m.
^{2. A} non-woven fabric of ^two or more long fibers.
The thin, lightweight reinforced hydroentangled non-woven fabric according to any one of 2 to 3. 4. The basis weight of the whole nonwoven fabric in which the wet web layer and the reinforced support are entangled with each other by a high-pressure water flow to have a basis weight of 1.
Less than 00 g / m ² , and the ratio of longitudinal strength to lateral strength (longitudinal strength / lateral strength) and the ratio of lateral elongation to longitudinal elongation (lateral elongation / longitudinal elongation) are 0.5 to 2.0. The thin lightweight reinforced hydroentangled nonwoven fabric according to any one of claims 1 to 3, characterized in that 5. A wet web layer and a reinforced support are entangled by a high-pressure water flow, and the Frazier air permeability of the whole integrated nonwoven fabric is 15 cc / cm ² · sec or more. The thin, lightweight reinforced hydroentangled nonwoven fabric according to any one of claims.