JPH07316968A - Composite non-woven fabric and its production - Google Patents

Abstract

PURPOSE:To produce a composite nonwoven fabric excellent in mechanical characteristics such as tensile strength and interlaminar peeling strength, dimensional stability, flexibility, water absorption and moisture absorption, and suitable not only as a raw material for industrial materials but also as a raw material for general materials. CONSTITUTION:This composite nonwoven fabric is produced by laminating nonwoven web layers B comprising regenerated cellulose staple fibers to both the surfaces of a synthetic filament nonwoven web layer A. The fibers of the nonwoven web layer A are partially heat-pressed therebetween. The fibers of the nonwoven web layer A and the fibers of the nonwoven web layer B are three-dimensionally interlaced with each other, and the fibers of the nonwoven web layer B themselves are also three-dimensionally interlaced with each other. Thus, the wholly incorporated composite nonwoven fabric is produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a composite which is excellent in mechanical properties such as tensile strength and delamination strength, dimensional stability, flexibility and water absorption / moisture absorption, and can also prevent generation of static electricity. The present invention relates to a nonwoven fabric and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, various composite non-woven fabrics in which a short fiber card web is laminated and composited on a base fabric have been known. For example, JP-A-53-114975 and JP-A-53-12
No. 4601 proposes a composite non-woven fabric in which a woven or knitted fabric is used as a base fabric and a non-woven web made of split fiber type composite short fibers or an ultrafine fiber non-woven web obtained by the melt blown method is laminated and composited thereon. However, these composite non-woven fabrics are limited in their use to synthetic leathers, and are extremely expensive in cost and inferior in economic efficiency. on the other hand,
In Japanese Patent Laid-Open No. 63-2111354, a long fiber non-woven fabric obtained by a spunbond method is used as a base fabric, and the long fibers present on one or both sides are partially cut to form fiber ends. A composite non-woven fabric in which fibers of a short fiber non-woven web laminated on a fabric are entangled with each other has been proposed. However, this composite nonwoven fabric has a problem that mechanical properties are deteriorated because the long fibers are partially cut, and further, the surface smoothness inherent in the long fiber nonwoven fabric is deteriorated.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above problems and is excellent in mechanical properties such as tensile strength and delamination strength, dimensional stability, flexibility, and water absorption / hygroscopicity, and moreover, it is electrostatically resistant. An object of the present invention is to provide a composite non-woven fabric which can be prevented from occurring and is suitable not only as a material for industrial materials but also as a material for general use, and a method capable of efficiently producing the same.

[0004]

The present inventors have arrived at the present invention as a result of extensive studies to solve the above problems. That is, the present invention has the following configurations as its gist. 1) A composite non-woven fabric in which a nonwoven web layer B made of regenerated cellulose short fibers is laminated on both sides of a synthetic long fiber nonwoven web layer A, and the constituent fibers of the nonwoven web layer A are partially heat-bonded. The constituent fibers of the non-woven web layer A and the constituent fibers of the non-woven web layer B are three-dimensionally entangled with each other, and the constituent fibers of the non-woven web layer B are three-dimensionally entangled with each other. A composite nonwoven fabric characterized by being integrated as a whole. 2) Using a hot embossing roll having a surface temperature of 50 to 80 ° C. lower than the melting point of the polymer having the lowest melting point among the constituent fibers of the synthetic long-fiber nonwoven web formed by the spunbond method, the linear pressure of the roll is 5 -30 kg / cm and subjected to partial heat-pressing treatment to form a synthetic long fiber non-woven web layer A, and then a non-woven web layer B made of regenerated cellulose short fibers is laminated on both sides of the obtained non-woven web layer A. After doing the first
As a step treatment, a high-pressure liquid flow treatment with a pressure of 5 to 30 kg / cm ² G is performed to pre-entangle the constituent fibers of the nonwoven web layer B, and subsequently the pressure is 40 to 150 kg / cm ² G mutually three-dimensionally entangling the constituent fibers of the fibers constituting the nonwoven web layer B of performing high pressure liquid jet treatment nonwoven web layer a of, and the structure fibers of the nonwoven web layer B A method for producing a composite non-woven fabric, which comprises three-dimensionally interlacing and integrating as a whole.

Next, the present invention will be described in detail. The long fibers constituting the synthetic long fiber non-woven web layer A in the present invention are made of a polyolefin polymer, a polyester polymer or a polyamide polymer having a fiber forming property. Examples of the polyolefin polymer include aliphatic α-monoolefins having 2 to 18 carbon atoms such as ethylene, propylene, butene-1, pentene-1,3-methylbutene-1, hexene-1, octene-1, dodecene-. A homopolyolefin polymer composed of 1, octadecene-1 can be mentioned. This aliphatic α-monoolefin is a derivative of other ethylenically unsaturated monomers such as butadiene,
It may be a polyolefin-based copolymer obtained by copolymerizing similar ethylenically unsaturated monomers such as isoprene, pentadiene-1,3 styrene and α-methylstyrene. In the case of a polyethylene-based polymer, propylene, butene-1, hexene-1, octene-1 or a similar higher α-olefin may be copolymerized with ethylene in an amount of 10% by weight or less. In the case of a polypropylene polymer, ethylene or a similar higher α-olefin may be copolymerized with propylene in an amount of 10% by weight or less, but the copolymerization ratio of these copolymers is When the content exceeds the above-mentioned weight%, the melting point of the copolymer decreases, and the mechanical properties and dimensional stability of the composite non-woven fabric obtained by using the non-woven web composed of the long fibers of these copolymers are improved under high temperature conditions. It is not preferable because it deteriorates the property. As the polyester polymer, an aromatic dicarboxylic acid such as terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, or an aliphatic dicarboxylic acid such as adipic acid or sebacic acid or an ester thereof is used as an acid component, and Ethylene glycol, diethylene glycol, 1,4-butadiol, neopentyl glycol, cyclohexane-1
Examples include homopolyester polymers or copolymers having a diol compound such as 4-dimethanol as an ester component. Incidentally, paraoxybenzoic acid, 5-sodium sulfoisophthalic acid, polyalkylene glycol, pentaerythsthritol, bisphenol A and the like may be added or copolymerized to these polyester polymers. Polyamide polymers include polyimino-1-oxotetramethylene (nylon 4), polytetramethylene adipamide (nylon 46), polycapramide (nylon 6), polyhexamethylene adipamide (nylon 66), polyundecana. Mido (nylon 11),
Examples thereof include polylaurolactamide (nylon 12), polymethaxylene adipamide, polyparaxylylene decanamide, polybiscyclohexylmethane decanamide, or a polyamide-based copolymer having these monomers as a constituent unit. Particularly, in the case of polytetramethylene adipamide, polytetramethylene adipamide is a polycapramide, polyhexamethylene adipamide, polyundecamethylene terephthalamide, or other polyamidopolyamide copolymerized by 30 mol% or less. It may be a tetramethylene adipamide-based copolymer. When the copolymerization rate of the other polyamide component exceeds 30 mol%, the melting point of the copolymer is lowered, and the composite nonwoven fabric obtained by using the nonwoven web made of long fibers of these copolymers is used under high temperature conditions. If so, mechanical properties and dimensional stability will be reduced, which is not preferable. In the present invention, the fiber-forming thermoplastic polymer may contain, for example, a matting agent, a pigment, a flameproofing agent, a deodorant, a light stabilizer, a heat stabilizer, an antioxidant, etc., if necessary. Various additives can be added within a range that does not impair the effects of the present invention.

The long fibers constituting the web layer A in the present invention are composed of the above-mentioned polymer having a fiber-forming property, and the form thereof is not only the above-mentioned polymer alone but also the above-mentioned polymer. Two or more different polymers selected from the above may each be a blended product blended within a range that does not impair the melt spinnability. Examples of this blend include a blend of a polyester polymer and a polyolefin polymer, and a blend of two different polyamide polymers. In the former case, the shrinkage of the unoriented polyester component can be suppressed immediately after melt spinning, which is particularly preferable. Further, the form of the long fibers may be one in which two different polymers selected from the above polymers are arranged in a core-sheath type or a parallel type. In this composite, for example, a core-sheath type in which a polyethylene terephthalate polymer is arranged in the core part and a polyethylene polymer in the sheath part, or a parallel type such as a polycapramide polymer and a polyhexamethylene adipamide polymer are arranged in parallel. The form may be mentioned.

The long fibers constituting the web layer A in the present invention are composed of the above-mentioned polymer having a fiber-forming property and have a single fiber fineness of 1.5 to 8.0 denier.
When the monofilament fineness is less than 1.5 denier, the mechanical properties of the obtained composite nonwoven fabric are deteriorated, and the spinnability in the melt spinning process is deteriorated. On the other hand, when the monofilament fineness is more than 8.0 denier, it is obtained. The texture of the obtained web is hard and a composite non-woven fabric having a high flexibility cannot be obtained, which is not preferable. Therefore, in the present invention, the single fiber fineness is preferably 1.5 to 8.0 denier, and more preferably 2.0 to 5.0 denier.

The web layer A in the present invention is composed of the above-mentioned long fibers, and the constituent fibers are partially heat-pressed to each other. This partial thermal pressure welding is a web of a portion corresponding to the engraved pattern by passing a web between a roll having an engraved pattern engraved on the surface, that is, an embossing roll and a metal roll having a heated and smooth surface. The constituent fibers are thermally bonded together. More specifically, this partial hot-pressing has a specific area with respect to the total surface area of the web layer A, that is, the individual hot-pressing areas do not necessarily have a circular shape. ~
It has an area of 1.0 mm ² , and its density, that is, the pressure contact density is ² to 80 points / cm ^2, preferably 4 to 60 points / cm ^2.
It should be one of This pressure contact density is 2 points / cm ²
If it is less than 1, the mechanical properties and shape retention of the web after hot-pressing are not improved, and if the pressure contact density exceeds 80 points / cm ² , flexibility and bulkiness are not improved, both of which are not preferable. . Further, the ratio of the area of the total heat-pressure-bonded region to the total surface area of the web layer A, that is, the pressure-contact area ratio is 2 to 30%, preferably 4 to 20%. If the press contact area ratio is less than 2%, the dimensional stability of the web after hot press contact is not improved, and thus the dimensional stability of the composite nonwoven fabric obtained by laminating the web layer B on the web layer A is poor, On the other hand, the pressure contact area ratio is 3
If it exceeds 0%, the strength and the dimensional stability are improved, but the flexibility is deteriorated, which is not preferable.

The web layer A in the present invention preferably has a basis weight of 10 to 200 g / m ² . When the basis weight is less than 10 g / m ² , the degree of dense overlap between the long fibers is low, and the texture of the composite non-woven fabric obtained by laminating the short fiber non-woven web layer B on the web layer A is deteriorated. On the other hand, when the basis weight exceeds 200 g / m ² , all the constituent fibers of the web layer A and the constituent fibers of the web layer B are three-dimensionally formed when the web layer B is laminated on the web layer A and subjected to the high-pressure liquid flow treatment. It is not preferable because it does not fully intertwine and the whole is not integrated. Therefore, in the present invention, this basis weight is 10 to 200 g / m ^{2 and} preferably 2
It is preferably 0 to 100 g / m ² .

The non-woven web layer B in the present invention is composed of regenerated cellulose short fibers obtained by solution spinning using wood pulp as a raw material and using an organic solvent such as N-methylphorine N oxide of cyclic amine as a solvent. It is something. This type of regenerated cellulose short fiber is generally referred to as "Lyocell", and for example, "TENCEL (registered trademark)" of Court Roose Co., Ltd. and "Sorujiyon (registered trademark)" of Rentuin Co. are known. In the non-woven web layer B, since the regenerated cellulose short fibers as described above are used as the constituent fibers, mechanical properties such as tensile strength and tear strength, ordinary dimensional stability, and dimensional stability when wet are obtained. It is possible to obtain a composite non-woven fabric having excellent properties, water absorption or hygroscopicity, and prevention of static electricity generation.

The web layer B has a basis weight of 10 to 1
It is preferably 00 g / m ² . Weight is 10
When it is less than g / m ² , not only the shape retention of the obtained web is not improved, but also sufficient water absorption cannot be obtained, while when the basis weight exceeds 100 g / m ² , the constituent fibers of the web layer A are Both the three-dimensional entanglement of the constituent fibers of the web layer B and the three-dimensional entanglement of the constituent fibers of the web layer B are not sufficiently obtained, which is not preferable.

In the composite nonwoven fabric of the present invention, as described above, the nonwoven web layer B made of the regenerated cellulose short fibers is laminated on both sides of the synthetic long fiber nonwoven web layer A having the above-mentioned heat-bonded area to form a nonwoven web. The constituent fibers of layer A and the non-woven web layer B
And the constituent fibers of the non-woven web layer B are three-dimensionally entangled with each other, and are integrated as a whole. This three-dimensional entanglement is formed by a known so-called high-pressure liquid flow treatment, whereby a non-woven fabric shape is maintained, water absorbency, and a flexible non-woven fabric is obtained. be able to.

The composite nonwoven fabric of the present invention can be efficiently manufactured by the following method. That is, the linear pressure of the roll is applied to the synthetic long-fiber non-woven web layer formed by the spun bond method by using a hot embossing roll whose surface temperature is 50 to 80 ° C. lower than the melting point of the polymer having the lowest melting point among the constituent fibers. A synthetic long-fiber nonwoven web layer A is formed by partial heat-pressing treatment at 5 to 30 kg / cm, and then a nonwoven web layer B made of regenerated regenerated cellulose short fibers is formed on both sides of the obtained nonwoven web layer A. Of the non-woven web layer B and the constituent fibers of the non-woven web layer B are three-dimensionally entangled with each other by laminating It is a method of three-dimensionally interlacing and integrating as a whole. First, the synthetic long fiber non-woven web layer A is manufactured by the spunbond method. That is,
The polyolefin-based polymer, polyester-based polymer or polyamide-based polymer having the fiber-forming property is used alone, or a blended product of two or more different polymers selected from the above polymers, Alternatively, two different polymers selected from the above-mentioned polymers are melt-spun in such a manner that they are arranged in a core-sheath type or a parallel type, the melt-spun polymer stream is cooled, and then an air sucker or the like is drawn. The take-up speed is 3000-600 using the take-off means.
After being collected at 0 m / min, it was opened, collected and deposited on a moving collecting surface to obtain a web made of single fibers having a single fiber fineness of 1.5 to 8.0 denier, and then obtained. The web layer A is obtained by subjecting the web to a hot pressing treatment using a hot embossing roll whose surface temperature is 50 to 80 ° C. lower than the melting point of the polymer having the lowest melting point among the constituent fibers. When melt-spun by the spunbond method, the take-up speed is 3
000 to 6000 m / min is preferable. When the take-up speed is less than 3000 m / min, the mechanical properties and dimensional stability of the obtained web are not improved because the degree of molecular orientation of the long fibers is not sufficiently increased, while the take-up speed is less than 6000 m / min. If it exceeds the above range, the spinnability at the time of melt spinning is deteriorated, which is not preferable.

When the web is subjected to the heat press contacting process using the hot embossing roll, the heat press contact region does not necessarily have a circular shape, but its area is 0.1 to 1.0.
mm ² , its density, that is, the pressure contact density is 5 to 100 points /
cm ^{2 is} preferably 10 to 80 points / cm ² , and the ratio of the area of the entire heat-pressure-bonded region to the total surface area of the web layer, that is, the pressure-contact area ratio is 5 to 50%, preferably 8 to 40%. If the pressure contact density is less than 5 points / cm ² , the mechanical properties and shape retention of the web after hot pressure welding are not improved, while if the pressure contact density exceeds 100 points / cm ² , the web layer A The composite nonwoven fabric obtained by laminating the web layer B on the above and subjected to the high-pressure liquid flow treatment does not have improved flexibility and bulkiness, and the processability during the high-pressure liquid flow treatment is inferior. If the pressure contact area ratio is less than 5%, the dimensional stability of the web after heat pressure contact is not improved, and therefore the dimensional stability of the composite nonwoven fabric obtained by laminating the web layer B on the web layer A is poor. ，
On the other hand, if the pressure contact area ratio exceeds 50%, the workability at the time of laminating the web layer B on the web layer A and performing the high-pressure liquid flow treatment is poor, and both are not preferable. Further, the surface temperature of the roll is preferably 50 to 80 ° C. lower than the melting point of the polymer having the lowest melting point in the web constituent fibers, and the linear pressure of the roll is preferably 5 to 30 kg / cm. The conditions of this temperature and linear pressure are particularly important. If the difference between this temperature and the melting point of the polymer is more than 80 ° C and the linear pressure is less than 5 kg / cm, the effect of heat-pressure welding is poor and the obtained web Layer A
The dimensional stability of the composite non-woven fabric obtained by laminating the web layer B on the web layer A and the composite non-woven fabric is not improved. When the difference is less than 50 ° C. and the linear pressure exceeds 10 kg / cm, the effect of heat-pressure welding becomes too large. Therefore, when the web layer B is laminated on the web layer A and the high-pressure liquid flow treatment is performed, the entire structure of the web layer A is formed. The fibers and the constituent fibers of the web layer B are not sufficiently entangled three-dimensionally, and the fibers are not integrated as a whole, either of which is not preferable.

Next, a non-woven web layer B composed of the regenerated cellulose short fibers is laminated on both sides of the obtained non-woven web layer A, and the laminate is subjected to a high pressure liquid flow treatment to form the non-woven web layer A. The constituent fibers of (3) and the constituent fibers of the non-woven web layer B are three-dimensionally entangled with each other, and the constituent fibers of the non-woven web layer B are three-dimensionally entangled with each other to be integrated as a whole. The non-woven web layer B to be laminated is a parallel card web, a random card web, a crosslaid web or the like made of the regenerated cellulose short fibers, and
The basis weight is preferably 10 to 100 g / m ² . When performing the high-pressure liquid flow treatment, for example, a large number of injection holes having a hole diameter of 0.05 to 2.0 mm, particularly 0.1 to 0.4 mm are arranged in one row or a plurality of rows with a hole interval of 0.3 to 10 mm. Using the device, injection pressure is 5-150kg
A method of ejecting a high-pressure liquid of / cm ² G from the ejection hole is adopted. The injection holes are arranged in a row in the direction orthogonal to the direction of travel of the laminate. Generally, water or hot water is used as the high-pressure liquid. The distance between the injection hole and the laminate is preferably 1 to 15 cm. If this distance is less than 1 cm, the texture of the composite non-woven fabric obtained by this treatment is disturbed, while if this distance exceeds 15 cm, the impact force when the liquid flow collides with the laminate decreases and the three-dimensional entanglement occurs. Is not sufficiently applied, and neither is preferable.

In the present invention, the high pressure liquid flow treatment is performed in two stages. First, as the first-stage treatment, a high-pressure liquid flow having a pressure of 5 to 30 kg / cm ² G is jetted to collide with the laminate to pre-entangle the constituent fibers of the web layer B with each other. In this first-stage treatment, if the liquid flow pressure is less than 5 kg / cm ² G, the constituent fibers of the web layer B cannot be pre-entangled with each other, while the liquid flow pressure is 30 kg / cm 2. ^When it exceeds ² G, the constituent fibers of the web layer B are disturbed by the action of the liquid flow when the high-pressure liquid flow is jetted and collided with the above-mentioned laminate, and the texture and the ununiformity of the fabric are generated in the web layer B. Absent.
Then, as the second stage treatment, the pressure is 40 to 150 kg.
/ Cm ² G of high-pressure liquid flow is ejected to collide with the laminate to three-dimensionally entangle the constituent fibers of the web layer A and the constituent fibers of the web layer B with each other, and The three-dimensional entanglement is performed to integrate the laminate as a whole. In this second-stage treatment, if the liquid flow pressure is less than 40 kg / cm ² G, the three-dimensional entanglement between the fibers as described above cannot be sufficiently formed, while the liquid flow pressure is When it exceeds 150 kg / cm ² G, the flexibility and bulkiness of the obtained composite nonwoven fabric are not improved,
Neither is preferable. In the present invention, a high-pressure liquid flow having a pressure of 40 to 150 kg / cm ² G is used as the second-stage treatment, and when the second-stage treatment is applied to the laminate, as described above, Since the constituent fibers of the web layer B are preliminarily entangled with each other by the step treatment, the constituent fibers of the web layer B are disturbed by the action of the liquid flow when the high-pressure treatment of the second step is performed, and the web layer B is disturbed. B
The texture of the fabric is not disturbed and the spot weight is not generated.
In carrying out the high-pressure liquid flow treatment, as a supporting material for supporting the laminate, for example, a mesh screen such as a wire mesh of 20 to 100 mesh, a perforated plate, etc., as long as the high-pressure liquid flow can penetrate the laminate, Not limited.

After the high pressure liquid flow treatment, excess moisture is removed from the treated laminate. A known method can be adopted for removing the excess water. For example, excess moisture can be mechanically removed to some extent by using a squeezing device such as a mangle roll, and then residual moisture can be removed by using a drying device such as a continuous hot air dryer to obtain the final composite nonwoven fabric product. In addition to the normal dry heat treatment, the dry treatment may be a wet heat treatment, if necessary.
Further, when selecting the processing conditions such as the drying processing temperature and time for performing the drying processing, the conditions may be selected not only to simply remove water but also to allow appropriate shrinkage.

[0018]

In the composite nonwoven fabric of the present invention, the non-woven web layer B made of regenerated cellulose short fibers is laminated on both sides of the synthetic long fiber non-woven web layer A so that the constituent fibers of the non-woven web layer A are partially heated. The constituent fibers of the non-woven web layer A and the constituent fibers of the non-woven web layer B are three-dimensionally entangled with each other and the constituent fibers of the non-woven web layer B are three-dimensionally entangled with each other. ，
It is integrated as a whole. In the present invention, the web layer A has a thermal pressure contact area of 0.1
Has an area of ˜1.0 mm ² , and its density, that is, the pressure contact density is 5 to 100 points / cm ^2, preferably 10 to 80 points / cm ^2.
cm ² and the ratio of the area of the total heat-bonded region to the total surface area of the web layer, that is, the pressure-bonded area ratio is 5 to 50%, preferably 8 to 40%, and the surface temperature has the lowest melting point in the web-constituting fibers. Using a hot embossing roll at a temperature 50 to 80 ° C lower than the melting point of the roll, the linear pressure of the roll is 5 to 30 kg.
/ Cm and the long-fiber non-woven web obtained by performing the partial hot-pressing treatment is used as a starting material. By such a thermocompression bonding process using a hot embossing roll having a lower temperature and a lower linear pressure than in the usual case, the constituent fibers of the long fiber web are once preliminarily thermocompressed. Then, the non-woven web layers B are laminated on both surfaces of the long-fiber non-woven web after the heat-pressing treatment, and then subjected to a high-pressure liquid flow treatment at a pressure of 5 to 30 kg / cm ² G as the first step. Then the pressure is 4 as the second stage treatment.
A high pressure liquid flow treatment of 0 to 150 kg / cm ² G is applied. In the present invention, this second stage pressure is 40 to 150 kg.
/ Cm ² G high-pressure liquid flow treatment causes the preliminary inter-fiber heat-welding of the long fibers existing in the hot-pressing region of the long-fiber nonwoven web after the hot-pressing treatment to be partially destroyed and Although they are separated and separated, such partial destruction of the heat-welding region does not occur in the entire heat-welding region. That is, it has a conventional area of 0.1 to 1.0 mm ² and a pressure contact density of 5 to 100 points / cm ^2, preferably 10
80 points / cm ^2, pressure area ratio is 5% to 50%, preferably partially destroyed thermally pressed region of 8% to 40%, 2 to 80 points in pressure contact point density / cm ² preferably 4 to 60 points / c
The thermal pressing area of 2 to 30%, preferably 4 to 20% in terms of m ² and pressing area ratio remains. Then, by using the long fiber non-woven web that leaves such a specific heat-welding region as the web layer A, that is, when the composite non-woven fabric is formed by the remaining heat-pressing region, the dimensional stability is improved, and
Due to the presence of many non-heat-pressed regions, the constituent fibers of the non-woven web layer A and the constituent fibers of the non-woven web layer B are sufficiently entangled with each other three-dimensionally and integrated as a whole, Mechanical properties such as tensile strength and delamination strength and flexibility are improved. Further, in the present invention, since the non-woven web layer B made of the regenerated cellulose short fibers as described above is laminated on both sides of the non-woven web layer A, when the composite non-woven fabric is formed, the three-dimensional inter-fiber Combined with mechanical entanglement, mechanical properties and dimensional stability are further improved, water and moisture absorption properties are provided, and the generation of static electricity is prevented.

[0019]

EXAMPLES Next, the present invention will be specifically described based on examples, but the present invention is not limited to these examples. In the examples, each characteristic value was measured by the following method. Melting point (℃): Differential scanning calorimeter DS manufactured by Perkin Elma
Using a C-2 type, the measurement is performed at a temperature rising rate of 20 ° C./min,
The temperature that gives the extreme value in the obtained melting endothermic curve was taken as the melting point. Relative viscosity (a): The relative viscosity (a) of polyethylene terephthalate was measured by the following method. That is, an equal weight mixture of phenol and ethane tetrachloride was used as a solvent, 0.5 g of a sample was dissolved in 100 cc of this solvent, and measurement was carried out by a conventional method at a temperature of 20 ° C. Unit weight of non-woven fabric (g / m ² ): 1 from the standard sample
After making 10 pieces of 0 cm x 10 cm sample piece in total and reaching the equilibrium water content, the weight (g) of each sample piece was weighed, and the average value of the obtained values was measured per unit area (m ² ). It was converted into the unit weight (g / m ² ). Tensile strength (kg / 5 cm width) and tensile elongation (%) of non-woven fabric: Measured according to the method described in JIS-L-1096A. That is, the sample length is 10 cm and the sample width is 5 c
A total of 10 sample pieces of m were prepared, and for each sample piece, with respect to the longitudinal direction of the nonwoven fabric, a constant speed extension type tensile tester (Tensilon UTM-4-1-100 manufactured by Toyo Baldwin Co., Ltd.) was used, and a pulling speed was 10 cm. The tensile strength (kg / 5 cm width) average value obtained at the time of cutting
/ 5 cm width), and the average value of the elongation at break (%) was taken as the tensile elongation (%). Delamination strength (g / 5 cm width): A total of 3 sample pieces with a sample length of 15 cm and a sample width of 5 cm were prepared, and the non-woven fabric warp direction for each sample piece was measured by a constant-speed extension type tensile tester (Toyo Bold Win Tensilon UTM-4-1-10
0), the web layer B was forcibly peeled from the web layer A to a position of 5 cm from the end of the nonwoven fabric at a pulling speed of 10 cm / min, and the average value of the load values (g / 5 cm width) obtained Was defined as the delamination strength (g / 5 cm width). Area shrinkage (%): sample length 20 cm, sample width 20 c
A total of 5 sample pieces of m were prepared, and each sample piece was heat-treated for 5 minutes using an air oven type heat treatment machine at a predetermined temperature. Then, using the area S1 (cm ² ) value of the sample piece before the heat treatment and the area S2 (cm ² ) value of the sample piece after the heat treatment,
The average value of the shrinkage rates (%) calculated according to the following formula (1) was defined as the area shrinkage rate (%). Area shrinkage (%) = [1- (S2 / S1)] × 100 (1) Compressive stiffness (g): sample length 10 cm, sample width 5 cm
A total of 5 sample pieces were prepared, and each sample piece was bent in the lateral direction to form a cylindrical object, and the ends were joined together to obtain a sample for measuring compression stiffness. Then, for each measurement sample, the maximum obtained by compressing at a compression rate of 5 cm / min in the axial direction using a constant-speed extension type tensile tester (Tensilon UTM-4-1-100 manufactured by Toyo Baldwin Co., Ltd.) Load value (g)
The average value of was defined as the compression stiffness (g). Water absorption (cm / 10 minutes): Measured according to the Bayrek method described in JIS L-1096.

Example 1 A long fiber non-woven web layer A was produced by a spunbond method using a polyethylene terephthalate polymer chip having a melting point of 259 ° C. and a relative viscosity (a) of 1.38. That is,
The polymer chip is melted, melt-spun through a spinning hole at a spinning temperature of 290 ° C., the melt-spun polymer stream is cooled, and a take-up speed of 4800 m is obtained using an air sucker.
After being collected at a speed of 1 / min, the fibers are opened using a corona discharge means and collected / deposited on a moving collecting surface to obtain a single fiber fineness of 3.0.
A web made of long denier fibers was obtained, and then the obtained web was subjected to a heat press treatment to obtain a web layer A having a basis weight of 30 g / m ² . When performing the heat pressure welding process, the engraving pattern with an area of 0.64 mm ² has a pressure contact density of 20 points / cm ^2.
In addition, an embossing roll arranged with a pressure contact area ratio of 12.8% and a metal roll having a smooth surface were used. The surface temperature of this embossing roll and the metal roll with a smooth surface is 200 ° C,
Moreover, the linear pressure between both rolls was set to 10 kg / cm. Separately,
Regenerated cellulose short fibers having an average single fiber fineness of 1.4 denier and a fiber length of 44 mm obtained by solution spinning using wood pulp as a raw material and N-methylphorine N oxide of a cyclic amine as a solvent [Lentwin's "Soluyon" (Registered trademark)] and a parallel card machine was used to obtain a parallel card web layer B having a basis weight of 30 g / m ^2. Next, the web layer B was laminated on both sides of the obtained web layer A, and the obtained laminate was obtained. Move objects at a moving speed of 30 m / min 3
It was placed on a wire mesh of 0 mesh and subjected to high pressure liquid flow treatment. The high-pressure liquid flow treatment uses a high-pressure columnar water flow treatment device in which injection holes with a hole diameter of 0.12 mm are arranged in a three-group arrangement with a hole interval of 0.62 mm, and columnar is divided into two stages from a position 80 mm above the laminate. A stream of water was applied. The pressure was 20 kg / cm ² G in the first stage treatment, and the pressure was 60 kg / cm ² G in the second stage treatment. The second stage treatment was performed once from the front and back of the laminate. Then, excess moisture was removed from the obtained treated laminate using a mangle roll, and the laminate was dried using a hot air dryer at a temperature of 98 ° C to obtain a composite nonwoven fabric. The composite non-woven fabric obtained above had a basis weight of 90 g / m ² and a tensile strength of 4
3.0kg / 5cm width, tensile elongation 27%, high mechanical properties, delamination strength 420g / 5cm width, high delamination resistance, well integrated, processing temperature 160 ℃ The area shrinkage rate is 2.7%, the dimensional stability is excellent, the compression stiffness is 45 g, the flexibility is excellent, and the water absorption is 18.7 cm / 10 minutes. It was

Comparative Example 1 In the same manner as in Example 1 except that the embossing roll and the metal roll having a smooth surface had a surface temperature of 245 ° C. and a linear pressure between the two rolls of 50 kg / cm when the hot pressing treatment was performed. A web layer A was obtained. Then, the obtained web layer A
The same web layer B as that used in Example 1 was laminated on both surfaces of the above, the obtained laminate was placed on a wire net, and subjected to high-pressure columnar water treatment in the same manner as in Example 1, After removing water and drying, a composite nonwoven fabric was obtained. The composite non-woven fabric obtained above had a basis weight of 87 g / m ² and a tensile strength of 2
The width was 5.8 kg / 5 cm, the tensile elongation was 56%, the delamination strength was 125 g / 5 cm, the area shrinkage was 1.6% when the treatment temperature was 160 ° C., and the compression bending resistance was 128 g.
As is clear from the above characteristic values, this composite non-woven fabric has a high temperature for heat-pressure contact treatment, and the partial heat-pressure contact for the web layer A is strong. The existing constituent fibers of the web layer A are not separated and separated, that is, the constituent fibers and the constituent fibers of the web layer B are not sufficiently entangled three-dimensionally with each other, so that the mechanical properties such as tensile strength and tensile elongation are inferior. Moreover, since the integration as a whole is insufficient, the delamination resistance is not improved.

Comparative Example 2 As the web layer B, a single fiber made of polyethylene terephthalate polymer has a fineness of 2.0 denier and a fiber length of 51 m.
A parallel card web layer B having a basis weight of 20 g / m ² was obtained using a parallel card machine using m short fiber cotton. Then, a web layer B was formed on both sides of the web layer A obtained in Example 1.
Was laminated, and the obtained laminate was placed on a wire mesh of 30 mesh which moved at a moving speed of 30 m / min and subjected to high-pressure liquid flow treatment. The high-pressure liquid flow treatment uses a high-pressure columnar water flow treatment device in which injection holes with a hole diameter of 0.12 mm are arranged in a three-group arrangement with a hole interval of 0.62 mm, and columnar is divided into two stages from a position 80 mm above the laminate. A stream of water was applied. The pressure was 20 kg / cm ² G in the first stage treatment, and the pressure was 60 kg / cm ² G in the second stage treatment. The second stage treatment was performed once from the front and back of the laminate. Then, excess moisture was removed from the obtained treated laminate using a mangle roll, and the laminate was dried using a hot air dryer at a temperature of 98 ° C to obtain a composite nonwoven fabric. The composite non-woven fabric obtained above had a basis weight of 69 g / m ² , a tensile strength of 42.2 kg / 5 cm width, a tensile elongation of 66%, a delamination strength of 319 g / 5 cm width, and an area at a treatment temperature of 160 ° C. The shrinkage rate is 2.1%, the compression bending resistance is 34g, and the mechanical properties such as tensile strength and tensile elongation, delamination resistance, dimensional stability, and flexibility are all excellent, but the water absorption is high. It was as low as 1.3 cm / 10 minutes, and the nonwoven fabric surface had almost no water absorption.

Comparative Example 3 The same web layer B as that used in Example 1 was laminated on only one side of the web layer A used in Example 1, and the obtained laminate was placed on a wire mesh, A composite non-woven fabric was obtained in the same manner as in Example 1 except that the pressure of the two-stage high-pressure columnar water treatment was 70 kg / cm ² G. The composite non-woven fabric obtained above is
Unit weight is 60 g / m ² , tensile strength is 26.6 kg / 5
cm width, tensile elongation 59%, delamination strength 427g
Area shrinkage at a width of / 5 cm and a processing temperature of 160 ° C is 2.
3%, the compression bending resistance was 28 g. This composite non-woven fabric has mechanical properties and delamination resistance that are practically problematic because the constituent fibers of the web layer A and the constituent fibers of the web layer B are three-dimensionally entangled with each other when subjected to high-pressure columnar water flow treatment. However, the abrasion resistance was inferior because the constituent fibers were not sufficiently entangled on the surface of the other surface where the web layer A was exposed.

[0024]

Industrial Applicability The composite nonwoven fabric of the present invention comprises a synthetic long fiber non-woven web layer A and a non-woven web layer B made of regenerated cellulose short fibers laminated on both sides of the non-woven web layer A. The constituent fibers of the non-woven web layer A and the constituent fibers of the non-woven web layer B are three-dimensionally entangled with each other, and the constituent fibers of the non-woven web layer B are three-dimensionally entangled with each other. However, it must be integrated as a whole, and has excellent mechanical properties such as tensile strength and delamination strength, dimensional stability, flexibility, and water absorption / moisture absorption, and must also prevent the generation of static electricity. Therefore, it is suitable not only as a material for industrial materials but also as a general material. Moreover, according to the method for producing a composite nonwoven fabric of the present invention, the nonwoven fabric can be efficiently produced.

Claims (2)

[Claims] 1. A composite non-woven fabric in which a nonwoven web layer B made of regenerated cellulose short fibers is laminated on both sides of a composite growth fiber nonwoven web layer A, wherein the constituent fibers of the nonwoven web layer A are partially separated. The constituent fibers of the non-woven web layer A and the constituent fibers of the non-woven web layer B are three-dimensionally entangled with each other, and the constituent fibers of the non-woven web layer B are three-dimensionally entangled with each other. A composite non-woven fabric characterized by being entangled and integrated as a whole. 2. A wire of a roll using a hot embossing roll whose surface temperature is 50 to 80 ° C. lower than the melting point of the polymer having the lowest melting point among the constituent fibers of the synthetic long fiber nonwoven web formed by the spunbond method. Pressure is 5 to 30 kg / cm
After forming a synthetic long fiber non-woven web layer A by partial heat-pressing treatment, and then laminating a non-woven web layer B made of regenerated cellulose short fibers on both sides of the obtained non-woven web layer A, The pressure is 5 to 30 kg / cm ² as a one-step treatment.
G by applying a high pressure liquid flow treatment to G to pre-entangle the constituent fibers of the non-woven web layer B with each other, and subsequently performing a high pressure liquid flow treatment at a pressure of 40 to 150 kg / cm ² G as the second stage treatment. The constituent fibers of the woven web layer A and the constituent fibers of the non-woven web layer B are three-dimensionally entangled with each other, and the constituent fibers of the non-woven web layer B are three-dimensionally entangled to be integrated as a whole. A method for producing a composite non-woven fabric, comprising: