JPH10195750A - Composite nonwoven fabric and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the nonwoven fabric having a craped surface to exhibit a new surface form, excellent in mechanical characteristics and flexibility and having elasticity. SOLUTION: This composite nonwoven fabric comprises a filament nonwoven web layer and a synthetic staple fiber nonwoven web layer laminated to at least one surface of the filament nonwoven web layer. The filaments composing the filament non-woven web layer have a latent crimping ability, which is actualized. The staple fibers composing the synthetic staple fiber nonwoven web layer are three-dimensionally interlaced with each other, and the filaments and the synthetic staple fibers are three-dimensionally interlaced with each other to form a wholly integrated product. The composite nonwoven fabric is again subjected to a relaxation thermal treatment to form a craped surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a composite nonwoven fabric and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, nonwoven fabrics having irregularities on the surface have been known. As one type of such a nonwoven fabric, there is one disclosed in, for example, JP-A-8-60509. This is because a web made of a heat-crimpable hydrophobic synthetic fiber and a web made of a hydrophilic fiber are overlapped to form a laminate, and the web is formed on a support roll having a large number of fine projections and drain holes on a smooth surface. Inject high water pressure into the laminate at
The fibers are entangled and rearranged to form a nonwoven fabric having an uneven distribution density of the fibers, which is heated to crimp the synthetic fibers, thereby raising only the high density portions. However, the ridge formed by this is relatively large, and it is not possible to form minute irregularities on the surface of the nonwoven fabric.

On the other hand, Japanese Patent Application Laid-Open No. Hei 8-92852 discloses that
After laminating a shrinkable fiber layer containing the heat-shrinkable fiber and a non-shrinkable fiber layer that does not substantially shrink at the temperature at which the heat-shrinkable fiber shrinks, and heat-pressing and joining the two spots, After applying heat treatment to shrink the shrinkable fiber layer to form wrinkles on the surface of the non-shrinkable fiber layer, peeling and removing the shrinkable fiber layer from the non-shrinkable fiber layer, the stretchable nonwoven fabric and What to do is disclosed. However, since the shrinkable fiber layer is peeled and removed, the wrinkles thus formed are not firmly fixed, and the trace of the peeled and removed portion remains to be a disadvantage. There is a point.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above problems and provides a nonwoven fabric having a surface morphology that has never existed by having a grain on its surface, and having excellent mechanical properties and flexibility. The purpose is to provide.

[0005]

Means for Solving the Problems The present inventors have accomplished the present invention as a result of intensive studies to solve the above problems. That is, the present invention provides (1) a composite nonwoven fabric in which a short-fiber nonwoven web is laminated on at least one surface of a long-fiber nonwoven web layer, and the long fibers constituting the long-fiber nonwoven web have a latent crimp ability. The short crimps constituting the short fiber non-woven web have three-dimensional entanglement with each other, and the long fibers and short fibers have three-dimensional entanglement with each other. And (2) a long-fiber non-woven web composed of long fibers having latent crimpability, which is integrated as a whole and has a texture on the surface. Formed by
The obtained long-fiber nonwoven web is partially subjected to a thermal press treatment, and the partially heat-bonded long-fiber nonwoven web is used as a fiber component of the long fibers constituting the nonwoven web. By performing a heat treatment at a temperature lower than the melting point of the low melting point component, the latent crimp of the long fiber is made obvious and subjected to a shrinkage treatment. An elongation treatment is performed, and then a short fiber nonwoven web is laminated on at least one surface of the contracted long fiber nonwoven web, and the laminated nonwoven web is subjected to a high-pressure liquid flow treatment to obtain a short fiber nonwoven web. The short fibers are three-dimensionally entangled with each other, and the long fibers and the short fibers are three-dimensionally entangled with each other to integrate the laminated nonwoven web as a whole, and then subjected to a re-relaxation heat treatment. Composite non-woven And method of manufacturing, it is an gist.

As described above, according to the present invention, a composite nonwoven fabric is obtained in which a long fiber web and a short fiber web having crimping performance are integrated and a grain is generated due to a difference in shrinkage. Further, by revealing the latent crimp of the long fiber yarn constituting the long fiber nonwoven web, shrinkage is expressed in the laminated nonwoven web, and a composite nonwoven fabric having good elasticity can be obtained.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The long fibers constituting the long-fiber nonwoven web in the present invention are constituted by, for example, composite long fibers having a latent crimp made of thermoplastic polymer components having different heat shrinkages. , Latent crimpability is imparted.

As the combination of the thermoplastic polymer components having different heat shrinkages, different or same thermoplastic polymers may be selected according to the purpose. Each of the thermoplastic polymers has a fiber-forming property, and can be melt-spun using a usual melt-spinning apparatus. Examples of the combination of thermoplastic polymers having different heat shrinkages include polyester and polyamide, polyester and polyolefin, and polyamide and polyolefin. Examples of the polyester-based polymer include polyesters such as polyethylene terephthalate, polybutylene terephthalate, and copolymerized polyesters containing these as a main component. Examples of the polyamide system include nylon 6, nylon 46, nylon 66, nylon 610, and copolymerized nylon containing these as a main component. Examples of polyolefins include polypropylene, high density polyethylene, linear low density polyethylene, and ethylene / propylene copolymer. In addition, a combination of ethylene / vinyl acetate with a polyester, polyamide, polyolefin, or the like may be used. Examples of the combination of the same type of thermoplastic polymers include polymers having different viscosities or melting points, such as polyester-based, polyamide-based, polyolefin-based polymers, and ethylene / vinyl acetate copolymers.

As long fiber yarns having latent crimpability,
A composite form in which two types of polymers having fiber-forming properties and different heat shrinkages are arranged in parallel with respect to fiber yarns, or these polymers are arranged in a core-sheath type with an eccentric structure Complex forms are mentioned.

Here, when the two types of polymers are compatible, for example, in the case of a combination of the same material having different viscosities, or in the case of a combination of a homopolymer and a copolymer, the cross-sectional shape thereof is a parallel structure, A core-sheath structure can be applied. However, when the two types of polymers have poor compatibility, for example, in the case of a combination of a polyester type and a polyamide type, a polyester type and a polyolefin type, and a polyamide type and a polyolefin type, an eccentric core-sheath structure should be applied. Good. This is because the use of a parallel structure with a combination of polymers having poor compatibility with each other causes separation between the two polymers during the spinning process, causing a serious problem.

The fiber-forming thermoplastic polymer may, if necessary, be provided with, for example, a matting agent, a pigment, a flame retardant, a deodorant,
Various additives such as a light stabilizer, a heat stabilizer and an antioxidant can be added within a range that does not impair the effects of the present invention.

The long fibers constituting the nonwoven web of long fibers preferably have a single fiber fineness of 1.5 to 8.0 denier. If the single fiber fineness is less than 1.5 denier, the mechanical properties of the obtained composite nonwoven fabric tend to decrease, and the spinning property tends to decrease in the melt spinning step. On the other hand, when the single fiber fineness exceeds 8.0 denier, the texture of the obtained web becomes hard, and it becomes difficult to obtain a highly flexible composite nonwoven fabric. Therefore, in the present invention, the single fiber fineness is 1.5 to 8.0 denier, preferably 2.0 to 2.0 denier.
It should be 5.0 denier.

The long-fiber nonwoven web is composed of the long fibers, and the constituent fibers are partially heat-welded. At this time, if the thermocompression bonding temperature is a temperature close to the melting point of the fiber-forming low-melting polymer, the thermocompression bonding becomes strong, so that the dimensional stability of the long fiber web is excellent, and the high-pressure liquid flow treatment is performed later. During the confounding integration in the above, the partial thermocompression bonding part remains,
The long fibers and the short fibers existing in the non-thermocompression bonding part are three-dimensionally entangled with each other. Therefore, the obtained composite nonwoven fabric has high elongation at break in the vertical and horizontal directions, excellent dimensional stability, and high mechanical strength. On the other hand, when the thermocompression bonding temperature is a temperature far from the melting point of the fiber-forming low-melting polymer, the partial thermocompression bonding section is in a state of temporary thermocompression bonding in which the fiber form is left, and confounding integration in the subsequent high-pressure liquid flow treatment At that time, the partial thermocompression bonding part is peeled off and becomes fibrous, and the long fiber can move freely,
Confound more randomly and three-dimensionally. Therefore, the obtained composite nonwoven fabric is excellent in flexibility and has high delamination strength. Which state should be after the high-pressure liquid flow treatment can be appropriately selected depending on the target properties of the composite nonwoven fabric and the like.

[0014] The partial heat-pressing is performed by passing a web between a heated roll having an engraved pattern engraved on its surface, ie, an embossing roll, and a heated metal roll having a smooth surface. It is the one in which the web constituting fibers corresponding to the pattern are thermally bonded together. More specifically, the location where the partial thermal pressure welding is performed has a specific area with respect to the entire surface of the long fiber nonwoven web.
That is, each heat-pressing area does not necessarily have to have a circular shape, but has an area of 0.1 to 1.2 mm ² , and has a density of 10 to 80 points / cm.
² , preferably 15 to 60 points / cm ² .
If the pressure junction density is less than 10 points / cm ^2, it is difficult to improve the mechanical properties and shape retention of the web after the thermal pressure welding. On the other hand, if the press contact density exceeds 80 points / cm ² , it is difficult to improve flexibility and bulkiness, and it is difficult to obtain sufficient shrinkage when shrinking the long fiber nonwoven web.
Further, the ratio of the area of the entire heat-pressed area to the entire surface area of the long-fiber nonwoven web, that is, the press-contact area ratio, is preferably 2 to 30%, and more preferably 4 to 20%. When the contact area ratio is 2
%, The mechanical properties and dimensional stability of the web after hot pressing tend to be inferior. Therefore, the machine of the composite nonwoven fabric obtained by laminating the short fiber nonwoven web on the long fiber nonwoven web is used. Characteristic and dimensional stability are likely to be inferior. on the other hand,
If the pressed area ratio exceeds 30%, most of the constituent fibers are heat-sealed, and even if heat shrinking is performed, the portion where latent crimps can become apparent is reduced, and not only does not substantially shrink. In addition, the flexibility of the long-fiber nonwoven web is easily impaired.

[0015] The long fiber nonwoven web has a basis weight of 10 to 10.
It is preferably 100 g / m ² . The basis weight is 10g /
If it is less than m ^2, the long fiber nonwoven web in laminated short fibrous nonwoven web hardly out grain to the composite nonwoven fabric obtained by the composite, also sometimes its formation is reduced, also resulting nonwoven Tends to decrease in mechanical strength. On the other hand, when the basis weight exceeds 100 g / m ² , when the short fiber nonwoven web is laminated on the long fiber nonwoven web and subjected to high-pressure liquid flow treatment, the constituent fibers of the long fiber nonwoven web and the short fiber nonwoven web are used. Is difficult to be sufficiently entangled three-dimensionally with the constituent fibers of the above, so that the fibers tend to delaminate easily. Accordingly, the basis weight is particularly preferably in the range of 10 to 60 g / m ² .

In order to make the crimp of a long fiber having a latent crimp constituting a long fiber nonwoven web obvious, a heat treatment is performed at a temperature lower than the melting point of the low melting point component of the fiber constituent components of the long fiber. do it. Then, the components constituting the long fibers cause different shrinkage under the heating condition, so that the crimp is made apparent, and the area of the substantially long-fiber nonwoven web shrinks. Will be held.

The constituent fibers of the short fiber web used in the present invention include natural fibers, regenerated fibers, and synthetic fibers. Natural fibers include cotton, wool, linen, silk and the like, and regenerated fibers include rayon and the like. Examples of the polymer constituting the synthetic fiber include a polyester-based polymer having a fiber-forming property, a polyolefin-based polymer, a polyamide-based polymer, an acrylic polymer, a polyvinyl alcohol-based polymer, and a copolymer containing these as a main component. And a blend polymer. Further, a composite fiber obtained by combining these polymers can also be used.

Examples of the polyester polymer include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid and naphthalene-2,6-dicarboxylic acid, aliphatic dicarboxylic acids such as adipic acid and sebacic acid, and esters thereof. As components, ethylene glycol, diethylene glycol, 1,4-butadiol, neopentyl glycol,
A homopolyester polymer or copolymer containing a diol compound such as cyclohexane-1,4-dimethanol as an alcohol component is exemplified. It should be noted that paraoxybenzoic acid, 5-sodium sulfoisophthalic acid, polyalkylene glycol, pentaerythritol, bisphenol A, and the like may be added or copolymerized to these polyester polymers.

Examples of the polyolefin polymer include aliphatic α-monoolefins having 2 to 18 carbon atoms, for example, ethylene, propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 1-hexene. Octene and 1-octadecene. These aliphatic α-monoolefins are polyolefins obtained by copolymerizing many ethylenically unsaturated monomers, for example, butadiene, isoprene, 1,3-pentadiene, styrene, and similar ethylenically unsaturated monomers such as α-methylstyrene. It may be a system polymer. In the case of a polyethylene polymer,
Ethylene may be copolymerized with propylene, 1-butene, 1-octene, 1-hexene, or a similar higher α-olefin by 10% by weight or less. In the case of a polypropylene-based polymer, For propylene,
10% by weight of ethylene or similar higher α-olefin
In the following, it may be copolymerized.

Examples of polyamide polymers include polyimino-1-oxotetramethylene (nylon 4), polytetramethylene adipamide (nylon 46), polycapramid (nylon 6), polyhexamethylene adipamide (nylon 66), Polyundecanamid (nylon 11),
Examples thereof include polylaurolactamide (nylon 12), polymethaxylene adipamide, polyparaxylylene decanamide, polybiscyclohexylmethanedecanamide, and a polyamide-based copolymer having these monomers as constituent units. In particular, in the case of polytetramethylene adipamide (nylon 46), a polyamide component such as polycapramid, polyhexamethylene adipamide, or polyundecamethylene terephthalamide is added to 30 mol% of polytetramethylene adipamide (nylon 46). A polytetramethylene adipamide copolymer copolymerized below may be used.

As the fiber form, a single-phase form in which the above-mentioned polymer is composed of a single substance, or a composite form in which a plurality of the above-mentioned polymers are arbitrarily selected according to the purpose (a core-in-sheath composite form, a parallel-type composite form, a split-type composite form) Form). The cross-sectional shape of the fiber is
Any shape such as a round shape, an elliptical shape, a diamond shape, a triangle shape, a T shape, a well shape, and a rectangular shape may be appropriately selected. Short fiber non-woven webs include, in addition to those made of a single material selected from the above-mentioned short fiber materials, those in which a plurality of types of materials are mixed, those in which materials of different fineness are mixed, and those having irregular cross sections And the like. In laminating the short fiber nonwoven web with the long fiber nonwoven web, the short fiber nonwoven web may be made of the same material as the long fiber nonwoven web, or may be used as necessary. Those made of different materials may be adopted. The non-woven short fiber web is preferably a parallel card web or a cross-laid web made of the above-mentioned short fiber material.

The single fiber fineness of the constituent fibers of the short fiber nonwoven web is preferably 1.5 to 8.0 denier as in the case of the long fibers described above. The reason is the same as in the case of the long fiber described above.

Nonwoven web formed by this short fiber
Has a basis weight of 10 to 100 g / m ^TwoPrefer to be
New The basis weight is 10 g / m^TwoIf less than the obtained c
There is a tendency that the shape retention of eb is not improved. Meanwhile, the basis weight
Injury 100g / m^TwoExceeds, the long fiber nonwoven web
Of the constituent fibers of this short fiber nonwoven web
Original entanglement and of the constituent fibers of this short fiber nonwoven web
There is a tendency that three-dimensional confounding cannot be sufficiently obtained.

When the short fiber nonwoven web is laminated on both sides of the long fiber nonwoven web, the short fiber nonwoven web may be made of the same material, or may be made of different materials. .

The composite nonwoven fabric of the present invention can be efficiently produced by, for example, the following method. That is, first, a long-fiber non-woven web formed by the spunbond method,
A partial hot pressing treatment is performed using a hot embossing roll. Next, after laminating the short-fiber nonwoven web on at least one surface of the obtained synthetic long-fiber nonwoven web, the high-pressure liquid flow treatment is performed, and the constituent fibers of the long-fiber nonwoven web and the constituent fibers of the short-fiber nonwoven web And three-dimensionally entangled with each other, and the constituent fibers of the short-fiber nonwoven web may be entangled three-dimensionally and integrated as a whole.

Specifically, first, a long-fiber non-woven web is manufactured by a spun bond method. That is, two kinds of polymers having mutually different heat shrinkages selected from the above-mentioned polymers are melt-spun so as to be arranged in a parallel type or an eccentric core-sheath type. After cooling the melt-spun spun yarn, the take-up speed is set to 2500 using a take-off means such as an air sacker.
6000 m / min, and then the fiber is opened, collected and deposited on a moving collecting surface, and the single fiber fineness is 1.5
A web made of single fibers of up to 8.0 denier.

When the melt spinning is performed by the spun bond method, the take-off speed is set to 2500 to 6000 as described above.
m / min. If the take-off speed is less than 2500 m / min, the degree of molecular orientation of the long fibers does not sufficiently increase, so that the mechanical properties, dimensional stability and latent crimpability of the obtained web tend not to be improved. On the other hand, the take-up speed is 6000
If it exceeds m / min, the spinnability during melt spinning tends to decrease.

Next, the obtained long fiber web is thermally bonded using a hot embossing roll. At this time, the surface temperature of the roll is preferably 10 to 50 ° C. lower than the melting point of the polymer having the lowest melting point in the fiber component of the web, and the linear pressure of the roll is preferably 5 to 50 kg / cm. If the surface temperature is too close to the melting point of the polymer, the strength of the nonwoven web increases, but heat is applied to all the fibers constituting the long-fiber nonwoven web, resulting in crimping that must be latent. Since it becomes apparent in this step, there is a tendency that no shrinkage occurs when shrinking is performed. The linear pressure between the rolls is 5kg
If it is less than / cm, the effect of the heat pressing treatment is poor, and it is difficult to improve the dimensional stability of the obtained long-fiber nonwoven web. Therefore, the conditions under which the long fiber nonwoven web is thermally bonded are appropriately selected according to the type and basis weight of the low melting point component constituting the long fiber.

Next, the long-fiber nonwoven web obtained by the above method is subjected to a heat treatment at a temperature lower than the melting point of the low-melting-point component of the constituent components of the long-fiber, so as to be orthogonal to the machine direction and the machine direction. Shrinkage is generated in each of the directions to create a stretchable nonwoven web. By this heat treatment, the latent crimp of the fiber present in the non-heat-welded portion of the nonwoven web is made obvious, and the nonwoven web is substantially shrunk. As a temperature condition at that time, it is preferable to apply a temperature lower by 10 to 30 ° C. than the melting point of the low melting point component. When a high temperature of less than 10 ° C. is applied compared to the melting point of the low-melting component, the long-fiber nonwoven web shrinks, but the heat-fusing of the low-melting component causes full curing of the web, It is easy to be missing. Further, when a temperature lower than the melting point of the low melting point component by more than 30 ° C. is applied, the latent crimp of the long fibers constituting the long-fiber nonwoven web does not sufficiently appear.

As a heat treatment machine used in the shrinking step, it is desirable that no tension is applied to the nonwoven web, and examples thereof include a shrink dryer that blows hot air from both sides to the nonwoven web. Also, shrinkage can be generated by using a heat treatment machine of a suction band type. In this case, the amount of air to be blown out and the amount of air to be sucked are regulated, and by adding no extra amount of air to the nonwoven web, heat can be added to cause shrinkage. In order to express sufficient shrinkage in the long fiber nonwoven web and substantially impart elasticity, a sufficient amount of heat is applied,
In addition, the blowing air amount may be set within a range where the temperature does not drop or rise, and the suction amount may be slightly lower than the blowing air amount. Further, in order to sufficiently reduce the longitudinal shrinkage of the long-fiber nonwoven web, the long-fiber nonwoven web may be supplied at a speed higher than the moving speed of the net.

Next, the obtained long-fiber nonwoven web is subjected to a stretching treatment. In this stretching process, a pin tenter, an expander roll, or the like is used in the horizontal direction, and a plurality of rolls having different peripheral speeds are used in the vertical direction. It is assumed that the compression loop has disappeared. As a result, a low weight condition is obtained.

Thereafter, a web composed of the short fibers is laminated on at least one surface of the long fiber nonwoven web subjected to the stretching treatment. Then, the constituent fibers of the long-fiber nonwoven web and the constituent fibers of the short-fiber nonwoven web are mutually entangled three-dimensionally, and the constituent fibers of the short-fiber nonwoven web are three-dimensionally entangled with each other as a whole. Integrate. As a means for the three-dimensional confounding, there is a method of applying a high-pressure liquid flow. By performing the high-pressure liquid flow treatment, it is possible to obtain a composite nonwoven fabric that retains its form as a nonwoven fabric and has high flexibility.

When the high-pressure liquid flow treatment is performed, for example, the pore diameter is 0.05 to 2.0 mm, particularly 0.1 to 0.4 m
m orifice heads are used in which a large number of m orifices are arranged in one or more rows with a hole interval of 0.3 to 10 mm,
The injection pressure is 40 to 200 kg / cm ² G, preferably 80
A method of injecting a high-pressure liquid flow of up to 150 kg / cm ² G from the injection hole is employed. That is, as described above, in the long-fiber nonwoven web, since the crimp that has been once exposed has disappeared by the stretching process, the constituent fibers of the long-fiber nonwoven web and the constituent fibers of the short-fiber nonwoven web are mutually exchanged. For good three-dimensional confounding, the level of energy applied by the high pressure liquid flow treatment must be increased. For this reason, as described above, a higher injection pressure than usual is adopted. As a result, the resulting composite nonwoven fabric has a high peel strength between the long fiber nonwoven web and the short fiber nonwoven web.

The orifices in the orifice head are arranged in rows in a direction perpendicular to the direction of travel of the laminate. Generally, water or hot water is used as the high-pressure liquid stream. The distance between the injection holes and the laminate is preferably between 1 and 15 cm. If this distance is less than 1 cm, the formation of the composite nonwoven fabric obtained by this treatment will be disturbed, while if this distance exceeds 15 cm, the impact force when the liquid stream collides with the laminate will decrease, resulting in three-dimensional confounding. Is not sufficiently applied.

When the high-pressure liquid flow treatment is performed, the support for supporting the laminate may be, for example, a mesh screen such as a 10 to 100 mesh wire mesh or a perforated plate, and the high-pressure liquid flow may pass through the laminate and the support. There is no particular limitation as long as it can be performed.

When laminating short fiber nonwoven webs on both sides of a long fiber nonwoven web, the laminate obtained by performing the entanglement treatment from one side by the above method is inverted, and the entanglement is similarly performed from the opposite side. By performing the treatment, it is possible to obtain a composite nonwoven fabric in which both sides are integrated.

After the constituent fibers are three-dimensionally entangled by applying a high-pressure liquid flow treatment, excess moisture is removed from the laminate. A known method can be employed for removing the excess moisture. For example, excess moisture is mechanically removed to some extent using a squeezing device such as a mangle roll, and the remaining moisture is subsequently removed using a drying device such as a continuous hot air dryer to obtain a composite nonwoven fabric.

As described above, a composite nonwoven fabric having excellent delamination strength can be obtained.

Further, according to the present invention, the composite nonwoven fabric thus obtained is further subjected to a re-relaxation heat treatment, whereby the crimps stretched as described above are re-emerged.
That is, by performing a re-relaxation heat treatment on the composite nonwoven fabric integrated by the high-pressure liquid flow treatment, the crimps in a slightly stretched state are re-emerged, and the short fibers are raised on the surface of the composite nonwoven web to form crimps, A composite nonwoven fabric having fine irregularities on the surface is obtained. This composite nonwoven fabric also has elasticity. At the time of the re-relaxation heat treatment, a temperature condition higher than the temperature of the first actualization treatment is set in consideration of the heat history based on the first actualization treatment of the latent crimp. Preferably, the re-relaxation heat treatment is performed at a temperature that is 5 to 20 ° C. higher than the initial actualization heat treatment temperature. At this time, if a temperature condition equal to or lower than the temperature of the first revealing process is set, the texture tends to be hard to appear due to the heat history described above.

The composite non-woven fabric thus obtained can be subjected to processing such as dyeing and printing as required.

[0041]

Next, the present invention will be specifically described based on examples, but the present invention is not limited to these examples.

The measurement of various characteristic values in the following examples was carried out by the following methods. (1) Melting point (° C.): Measured using a differential scanning calorimeter DSC-2 manufactured by Perkin Elmer Co. under the condition of a temperature rising rate of 20 ° C./min. Melting point.

(2) Melt flow rate (g / 10
Min): Measured according to the method described in ASTM-D-1238 (L).

(3) Relative viscosity: The relative viscosities of polyethylene terephthalate and copolymerized polyester were measured by the following method. That is, a mixture of phenol and ethane tetrachloride was used as a solvent in an equal weight mixture, 0.5 g of a sample was dissolved in 100 cc of the solvent, and the measurement was conducted by a conventional method at a temperature of 20 ° C.

(4) Fabric weight (g / m ² ) of the non-woven fabric: A total of 10 cm × 10 cm sample pieces from a standard sample.
After making a point and reaching the equilibrium moisture, the weight (g) of each sample piece is weighed, and the average value of the obtained values is converted into a unit area (m ² ) and the basis weight (g / m ² ). ² )

(5) Tensile strength of nonwoven fabric (kg / 5cm
Width): Measured according to the method described in JIS-L-1096A. That is, the sample length is 15 cm and the sample width is 5 cm
10 pieces were made in the machine direction (MD) of the nonwoven fabric,
For each specimen, in the MD direction of the nonwoven fabric, a constant-speed elongation type tensile tester (Tensilon UTM manufactured by Toyo Baldwin Co., Ltd.)
Using (4-1-100), the sample was stretched at a gripping interval of 10 cm and a tensile speed of 10 cm / min. The average value of the obtained load values at cutting (kg / 5 cm width) was defined as tensile strength (kg / 5 cm width).

(6) Area shrinkage (%): sample length is 20c
m, a total of five sample pieces having a sample width of 20 cm were prepared, and each sample piece was subjected to a heat treatment for 5 minutes using an air oven type heat treatment machine at a predetermined temperature. Then, the area S1 (cm ² ) value of the sample piece before the heat treatment and the area S2 of the sample piece after the heat treatment
Using the (cm ² ) value, the average value of the shrinkage rates (%) calculated according to the following equation was defined as the area shrinkage rate (%).

Area shrinkage (%) = [1- (S2 / S1)] × 100

(7) Cracking on the surface of the non-woven fabric: A sample having a smooth surface and no graining was evaluated as 1 by an appearance inspection, and a grain having the largest graining was set to 5, and evaluated on a five-point scale.

(8) Compression stiffness (g): sample length is 10c
m, a total of five sample pieces each having a sample width of 5 cm were prepared, and each sample piece was bent in the lateral direction to form a cylindrical object, and the end of each was joined to obtain a compression-hardness measurement sample. Next, a constant speed elongation type tensile tester (Tensilon UTM-4-1- manufactured by Toyo Baldwin Co., Ltd.) was used for each measurement sample in the axial direction.
100), and compression was performed at a compression speed of 5 cm / min, and the average value of the obtained maximum load values (g) was defined as the compression stiffness (g).

(9) Elongation recovery rate (%): sample width 5 cm,
Five sample pieces each having a sample length of 15 cm were prepared in the machine direction (MD) of the nonwoven fabric and in the direction (CD) perpendicular to the nonwoven fabric, and a constant-speed extensional tensile tester (Tensilon UTM-4-1-100) manufactured by Toyo Baldwin Co., Ltd. ) And JIS L
-1096 In accordance with the method described in 6.13.1A, for each sample, a sample piece is set to 10 cm at a sample holding interval of 10 cm.
The rate of recovery elongation with respect to the constant elongation at the time when the elongation reached 30% was determined, and the average value was taken as the elongation recovery rate (%). (Example 1) When forming a long fiber yarn constituting a long fiber nonwoven web, a melt flow rate value measured by ASTM-D-1238 (L) is 100 g / 10 minutes and a melting point is 160 ° C. Using a polypropylene and a copolymerized polypropylene having a melt flow rate of 70 g / 10 min and a melting point of 138 ° C., in which ethylene is copolymerized at 4 wt%, the composite ratio of the polymer components is determined by weight ratio through a parallel type composite spinneret. 1: 1 ratio, the single hole discharge rate was 0.78 g / min,
Melt spinning was performed at a temperature of 210 ° C. Then, after the yarn spun from the parallel type composite spinneret is cooled, the yarn is taken up by air soccer at a speed of 3500 m / min, opened by a known opening device, and collected on a moving collecting surface. The web was deposited to form a long-fiber non-woven web, and subsequently subjected to a thermocompression treatment. At the time of thermocompression bonding, an embossing roll engraved with a pressure contact area of 0.36 mm ² and a pressure contact density of 16 pieces / cm ² ;
Using a flat surface roll, set the roll surface temperature to 1
At 25 ° C., the linear pressure between the rolls was 30 kg / cm. The long-fiber non-woven web obtained by this thermocompression treatment is a 20-g / m ² long-fiber non-woven web composed of a 2 denier yarn in which both polymer components are arranged in parallel in the yarn direction. there were.

Subsequently, the obtained long-fiber nonwoven web was subjected to a heat treatment for realizing the crimp. For this heat treatment, use a shrink dryer manufactured by Kotobuki Industries Co., Ltd.
The processing temperature was 118 ° C., and the overfeed rate of the supply speed was 25%. The nonwoven web obtained through this process is
A contraction of 25% in the machine direction and a contraction of 20% in the direction perpendicular to the machine direction occur, the area shrinkage becomes 40%, and the basis weight is 3
It was a long-fiber non-woven web having 3 g / m ² of elasticity and flexibility.

The constituent fibers of the short fiber nonwoven web have a melt flow rate of 30 g / 10 min and a melting point of 160 ° C.
Of polypropylene short fiber was prepared. That is, using the polypropylene, melt spinning was performed at a temperature of 240 ° C. through a round single-phase spinneret with a single hole discharge rate of 0.95 g / min. After cooling the yarn spun from the round single-phase spinneret, a finishing oil was applied, and the yarn was taken up as an undrawn yarn through a roll having a take-up speed of 1000 m / min. Next, the undrawn yarn tow was drawn 3.0 times using a known drawing machine, guided to a push-in type crimper, crimped, and cut into 51 mm. The fineness of the drawn short fibers was 3 denier. Subsequently, a parallel card web having a basis weight of 15 g / m ² was prepared using the short fibers.

The long fiber nonwoven web having the crimps revealed is stretched by 22% in the longitudinal direction by using two rolls having different peripheral speeds and 18% in the transverse direction by using a pin tenter. A short fiber nonwoven web is laminated on one side of the nonwoven web, and placed on a 70-mesh metal net moving with the short fiber nonwoven web facing upward. Pre-entanglement treatment was performed with a high-pressure liquid flow having an injection pressure of 40 kg / cm ² G from a position 50 mm above the short fiber nonwoven web using orifice heads arranged in a line at 6 mm. Subsequently, using the above-mentioned orifice head, entanglement treatment was performed with a high-pressure liquid flow having an injection pressure of 120 kg / cm ² G.

At this point, although the crimp of the long-fiber non-woven web has disappeared by the above-mentioned stretching, the fibers constituting the short-fiber non-woven web are entangled with each other.
The fibers constituting the short fiber nonwoven web and the long fiber nonwoven web were entangled and densely integrated. Excessive moisture is removed from the entangled laminate by a mangle, which is a known moisture removing device. Subsequently, using a shrink dryer, the processing temperature is 128 ° C., and the overfeed rate of the feed rate, that is, the relaxation rate is reduced. A re-relaxation heat treatment was performed at 18%. Table 1 shows the performance of the obtained composite nonwoven fabric.

The obtained composite nonwoven fabric had a texture in which short fibers were raised from the surface of the nonwoven fabric, had excellent stretchability in both the longitudinal and transverse directions, and exhibited good mechanical properties and flexibility. .

[0057]

[Table 1]

(Example 2) As the conditions for the re-relaxation heat treatment, the processing temperature was 133 ° C and the overfeed rate of the feed rate was 2
A composite nonwoven fabric was obtained under the same conditions as in Example 1 except that it was set to 0%. Table 1 shows the performance of the obtained composite nonwoven fabric. The obtained composite nonwoven fabric exhibited more noticeable grain than in Example 1, and had more excellent stretchability in the vertical and horizontal directions than Example 1, and exhibited good mechanical properties and flexibility. Was.

Example 3 A short fiber nonwoven web having a melt flow rate of 40 g / 10 min and a melting point of 160 ° C.
4 wt% copolymerized with polypropylene and has a melt flow rate of 30 g / 10 min and a melting point of 138.
The copolymerization ratio of the polymer component was set to a weight ratio of 1: 1 through a parallel-type composite spinneret using a copolymerized polypropylene at a temperature of 100 ° C., the single hole discharge rate was set to 0.89 g / min, and the temperature was 240 ° C.
The melt spinning was performed at a temperature of. Then, after cooling the yarn spun from the parallel type composite spinneret, a finishing oil is applied,
It was wound as an undrawn yarn through a roll having a take-up speed of 1000 m / min. Next, the undrawn yarn tow was drawn 2.8 times using a known drawing machine, guided to a push-in type crimper, subjected to crimping, and cut into 51 mm. The fineness of the drawn short fibers was 3 denier. Subsequently, a parallel card web having a basis weight of 15 g / m ² was prepared using the short fibers.

The other conditions were the same as in Example 1 to obtain a composite nonwoven fabric. Table 1 shows the performance of the obtained composite nonwoven fabric. In the obtained composite nonwoven fabric, finer grains than those in Example 1 were developed on the surface. Also in the vertical direction,
The elasticity in the transverse direction was even better than that of Example 1, and exhibited good mechanical properties and flexibility.

Example 4 As a short fiber nonwoven web, as shown in FIG. 1, the melt flow rate value was 20 g / 10
Using polypropylene (1) having a melting point of 160 ° C. per minute and polyethylene terephthalate (2) having a relative viscosity of 1.38 and a melting point of 258 ° C., the total number of both arranged in the fiber cross section is 12 as shown in the figure. Melt spinning was performed at a temperature of 290 ° C. through a split type composite spinneret with a composite ratio of polymer components of 1: 1 by weight, a single hole discharge rate of 1.01 g / min. Then, after cooling the spun yarn, a finishing oil is applied, and the take-up speed is 1000 m /
It was wound up as an undrawn yarn through a minute roll. Next, the undrawn yarn tow was stretched 3.2 times using a known drawing machine, and then guided to a push-in type crimper to give crimp and cut to 51 mm. The fineness of the drawn short fibers is 3 denier (polypropylene, polyethylene terephthalate:
0.25 denier x 6) each. Subsequently, a parallel card web having a basis weight of 15 g / m ² was prepared using the short fibers.

The other conditions were the same as in Example 1 to obtain a composite nonwoven fabric. At this time, the constituent fibers of the short fiber nonwoven web are split by the impact during the entanglement treatment by the high-pressure liquid flow, and become ultrafine fibers composed of 0.25 denier polypropylene polymer and polyethylene terephthalate polymer. Was. Table 2 shows the performance of the obtained composite nonwoven fabric.
In the obtained composite nonwoven fabric, ultrafine fibers were applied as short fibers as described above, so that finer grains than those in Example 1 appeared on the surface. Further, as in the case of Example 1, it was excellent in elasticity and flexibility, and exhibited good mechanical properties.

[0063]

[Table 2]

Example 5 A short fiber nonwoven web having an average single fiber fineness of 1.5 denier and an average fiber length of 25 m
A parallel card web having a basis weight of 15 g / m ² was prepared using m cotton fibers.

The other conditions were the same as in Example 1 to obtain a composite nonwoven fabric. Table 2 shows the performance of the obtained composite nonwoven fabric. The obtained composite nonwoven fabric has a texture in which the short fibers are embossed from the surface of the nonwoven fabric, and has a higher water absorption than that of Example 1 because cotton is applied to the short fibers,
Further, it was excellent in elasticity and flexibility, and exhibited good mechanical properties.

Example 6 8 mol% of the polyethylene terephthalate used in Example 4 and 8% by mole of isophthalic acid having a relative viscosity of 1.41 in forming a long fiber thread constituting a long fiber nonwoven web. Using a polyester having a melting point of 232 ° C., the composite ratio of the polymer component was set to a weight ratio of 1: 1 through a parallel type composite spinneret, and the single hole discharge amount was 1.
The melt spinning was performed at a temperature of 290 ° C. at a rate of 00 g / min.
Then, after the yarn spun from the parallel type composite spinneret is cooled, the yarn is taken up by air soccer at a speed of 4500 m / min, opened by a known opening device, and collected on a moving collecting surface. The web was deposited to form a long-fiber non-woven web, and subsequently subjected to a thermocompression treatment. At the time of thermocompression bonding, the pressure contact area is 0.1 mm.
36 mm ^2, and embossing roll engraved with pressure point density 16 / cm ^2, using a surface flat roll, the temperature of the roll surface 220 ° C., the linear pressure between rolls 30kg /
cm. The nonwoven web of long fiber obtained by the thermocompression bonding process has a basis weight of 2 denier yarn in which both polymer components are arranged in parallel in the yarn direction.
g / m ² long fiber nonwoven web.

Subsequently, the obtained long-fiber nonwoven web was subjected to a heat treatment for realizing crimp. For this heat treatment, use a shrink dryer manufactured by Kotobuki Industries Co., Ltd.
The processing temperature was 212 ° C., and the overfeed rate of the supply rate was 20%. The nonwoven web obtained through this process is
20% shrinkage in the machine direction and 16% shrinkage in the direction perpendicular to the machine direction, the area shrinkage rate is 33%, and the basis weight is 3%.
It was a long-fiber nonwoven web having 0 g / m ² of elasticity and flexibility.

When forming a nonwoven web of short fibers, the polyethylene terephthalate used in Example 4 was used, and the single hole discharge rate was 1.08 g / min through a round single-phase spinneret at a temperature of 290 ° C. Melt spinning was performed. After cooling the yarn spun from the round single-phase spinneret, a finishing oil was applied, and the yarn was taken up as an undrawn yarn through a roll having a take-up speed of 1000 m / min. Next, the undrawn yarn tow was stretched 3.4 times using a known stretching machine, and then guided into a push-in type crimper to be crimped and cut into 51 mm. The fineness of the drawn short fibers was 3 denier. Subsequently, a parallel card web having a basis weight of 15 g / m ² was prepared using the short fibers.

The long-fiber non-woven web with the apparent crimp is stretched by 22% in the longitudinal direction by using two rolls having different peripheral speeds, and 18% in the transverse direction by using a pin tenter. A short fiber nonwoven web is laminated on one side of the nonwoven web, and placed on a 70-mesh metal net moving with the short fiber nonwoven web facing upward. Pre-entanglement treatment was performed with a high-pressure liquid flow having an injection pressure of 40 kg / cm ² G from a position 50 mm above the short fiber nonwoven web using orifice heads arranged in a line at 6 mm. Subsequently, using the above-mentioned orifice head, entanglement treatment was performed with a high-pressure liquid flow having an injection pressure of 120 kg / cm ² G.

At this point, although the crimp of the long fiber nonwoven web has disappeared, the fibers constituting the short fiber nonwoven web are entangled with each other, and the short fiber nonwoven web and the long fiber nonwoven web are not entangled. The fibers constituting the web were entangled and densely integrated. Excess moisture is removed from the entangled laminate by a mangle, which is a known moisture removing device. Subsequently, using a shrink dryer, the processing temperature is 222 ° C., and the overfeed rate of the supply speed is 14%. A re-relaxation heat treatment was performed. Table 3 shows the performance of the obtained composite nonwoven fabric.

In the obtained composite nonwoven fabric, the polyester system was applied to the long-fiber nonwoven web and the short-fiber nonwoven web, so that almost the same level of grain as that of Example 1 was formed. Further, it had elasticity in both the vertical and horizontal directions, exhibited good flexibility, and exhibited good mechanical properties.

[0072]

[Table 3]

(Example 7) As a short fiber nonwoven web, the average single fiber fineness was 1.5 denier and the average fiber length was 25 m.
m, and a parallel card web having a basis weight of 15 g / m ² was prepared.

The other conditions were the same as in Example 6 to obtain a composite nonwoven fabric. Table 3 shows the performance of the obtained composite nonwoven fabric. The obtained composite nonwoven fabric had the same grain as that of Example 6, had better water absorption than Example 6, and exhibited good stretchability, flexibility, and mechanical properties.

(Example 8) In forming a long fiber thread constituting a long fiber nonwoven web, the polypropylene used for the short fiber of Example 3 and the polyethylene terephthalate used for the short fiber of Example 4 were mixed. Using an eccentric core-sheath composite spinneret in which polypropylene is positioned at the sheath and polyethylene terephthalate is positioned at the core, the composite ratio of the polymer components is set to 1: 1 by weight, and the single hole discharge rate is 0.93 g. /
The melt spinning was performed at a temperature of 290 ° C. And
After cooling the spun yarn, 420
The fiber was taken out at a speed of 0 m / min, spread by a known spreader, collected and deposited on a moving collecting surface to form a long-fiber nonwoven web, and subsequently subjected to a thermocompression treatment. At the time of thermocompression bonding, an embossing roll engraved with a pressure contact area of 0.36 mm ² and a density of 16 pressure contacts / cm ² and a flat surface roll were used, the temperature of the roll surface was set to 150 ° C., and the wire between the rolls was used. The pressure was 30 kg / cm. The long-fiber non-woven web obtained by this thermocompression treatment has a yarn weight of 20 g / m ² composed of a 2 denier yarn having polypropylene sheath and polyethylene terephthalate core disposed in the yarn direction. It was a fiber non-woven web.

Subsequently, the obtained long-fiber nonwoven web was subjected to a heat treatment for realizing a crimp. For this heat treatment, use a shrink dryer manufactured by Kotobuki Industries Co., Ltd.
The processing temperature was 140 ° C., and the overfeed rate of the supply speed was 14%. The nonwoven web obtained through this process is
14% shrinkage in the machine direction and 10% shrinkage in the direction perpendicular to the machine direction, an area shrinkage of 23%, and a basis weight of 2%
The web was a long-fiber nonwoven web having 6 g / m ² of elasticity and flexibility.

While the crimped web of the long fiber non-woven fabric is stretched by 12% in the longitudinal direction by using two rolls having different peripheral speeds and 8% in the horizontal direction by using a pin tenter, the non-woven fabric is The same polypropylene short fiber nonwoven web as in Example 1 was laminated on one side of the web. Then, it is placed on a 70-mesh metal net that moves with the short fiber nonwoven web facing upward, using orifice heads in which injection holes having a hole diameter of 0.1 mm are arranged in a line at a hole interval of 0.6 mm, From the position 50 mm above this short fiber nonwoven web, the injection pressure 40 kg
A pre-entanglement treatment was performed with a high-pressure liquid flow of / cm ² G.
Continue to use the orifice head and spray pressure 90 kg
The confounding treatment was performed by a high-pressure liquid flow of / cm ² G.

At this point, although the crimp of the long fiber nonwoven web has disappeared, the fibers constituting the short fiber nonwoven web are entangled with each other, and the short fiber nonwoven web and the long fiber nonwoven web are not entangled. The fibers constituting the web were entangled and densely integrated. Excess water is removed from the entangled laminate by a known water removing device, mangle, and subsequently, using a shrink dryer, the processing temperature is set to 150 ° C., and the overfeed rate of the supply speed is set to 8%. A re-relaxation heat treatment was performed. Table 3 shows the performance of the obtained composite nonwoven fabric. The obtained composite nonwoven fabric had a grain on its surface due to the use of long fibers having an eccentric core-sheath fiber form. Further, it had elasticity in both the vertical and horizontal directions and was excellent in flexibility. Also, it showed good mechanical properties.

(Example 9) As a short fiber nonwoven web, the average single fiber fineness was 1.5 denier and the average fiber length was 25 m.
A parallel card web having a basis weight of 30 g / m ² was prepared using m cotton fibers.

The other conditions were the same as in Example 8 to obtain a composite nonwoven fabric. Table 3 shows the performance of the obtained composite nonwoven fabric. The obtained composite non-woven fabric, as shown in Table 3,
It had a grain equivalent to that of Example 8, had better water absorption than Example 8, had elasticity and flexibility, and exhibited good mechanical properties.

(Comparative Example 1) In forming a long fiber yarn constituting a long fiber nonwoven web, the same polypropylene as in Example 1 was used, and the single-hole discharge amount was controlled through a single-phase round spinneret. The melt spinning was performed at a temperature of 210 ° C. at 0.87 g / min. After cooling the yarn spun from the single-phase round spinneret, the yarn is taken up by air soccer at a speed of 3900 m / min, opened by a known opening device, and collected on a moving collecting surface. -It was deposited to form a long-fiber non-woven web, and subsequently subjected to thermocompression bonding. At the time of thermocompression bonding, an embossing roll engraved with a pressure contact area of 0.36 mm ² and a pressure contact density of 16 pieces / cm ² and a flat surface roll were used.
Roll surface temperature 150 ℃, linear pressure between rolls 30k
g / cm. The nonwoven web of long fibers obtained by the thermocompression treatment was a nonwoven web of nonwoven fibers having a basis weight of 20 g / m ² constituted by a yarn having a fineness of 2 denier.

Subsequently, the obtained long-fiber nonwoven web was subjected to shrinkage processing. In this processing, a shrink dryer manufactured by Kotobuki Kogyo Co., Ltd. was used, the processing temperature was 140 ° C., and the overfeed rate of the supply speed was 5%. The nonwoven web obtained through this process generates only 5% shrinkage in the machine direction and 3% in the direction perpendicular to the machine direction, has an area shrinkage of 8%, and has a basis weight of 22 g / m ² . It was a long-fiber non-woven web with no properties.

Using the same short fiber nonwoven web as in Example 1, a parallel card web having a basis weight of 15 g / m ² was prepared under the same conditions as in Example 1. The short fiber non-woven web was laminated on one side of the long fiber non-woven web while stretching the shrink-processed long fiber non-woven web only in the longitudinal direction by 4%. A drying process was performed. Then, using a shrink dryer, set the processing temperature to 150
The re-relaxation heat treatment was performed at an overfeed rate of 3 ° C. and a feed rate of 3%. Table 4 shows the performance of the obtained composite nonwoven fabric. The obtained composite nonwoven fabric has a low fiber nonwoven web shrinkage stress because the fibers constituting the long fiber nonwoven web are a single phase of polypropylene, is particularly poor in elasticity, and does not exhibit crimp. It was not the object of the present invention.

[0084]

[Table 4]

(Comparative Example 2) The same polyethylene terephthalate as used in Example 4 was used to form the long fiber yarns constituting the long fiber nonwoven web, and the single-hole discharge amount was fed through a single-phase round spinneret. Was set to 1.07 g / min, and melt spinning was performed at a temperature of 290 ° C. After cooling the spun yarn, it is taken up by air soccer at a speed of 4800 m / min.
The fiber is spread by a known fiber spreader, and collected on a moving collecting surface.
The web was deposited to form a long-fiber non-woven web, and subsequently subjected to a thermocompression treatment. In the case of thermocompression bonding, the pressure contact area is 0.36m
Using an embossing roll engraved with m ² and a density of 16 contact points / cm ² and a flat-surfaced roll, the temperature of the roll surface was 245 ° C., and the linear pressure between the rolls was 30 kg / cm. The long-fiber nonwoven web obtained by this thermocompression bonding process has a basis weight of 20 g / filament composed of a yarn having a fineness of 2 denier.
It was a long-fiber nonwoven web of the m ^2.

Subsequently, the obtained long-fiber nonwoven web was subjected to shrinkage processing. In this processing, a shrink dryer manufactured by Kotobuki Kogyo Co., Ltd. was used, the processing temperature was 238 ° C., and the overfeed rate of the supply speed was 4%. The nonwoven web obtained through this process generates only 4% shrinkage in the machine direction and 2% in the direction orthogonal to the machine direction, has an area shrinkage of 6%, and has a basis weight of 21 g / m ² . It was a long-fiber nonwoven web with poor elasticity and flexibility.

Using the same short fiber nonwoven web as in Example 6, a parallel card web having a basis weight of 15 g / m ² was prepared under the same conditions as in Example 6. While elongating the shrink-processed long-fiber non-woven web by 3% only in the longitudinal direction, a short-fiber non-woven web is laminated on one side of the long-fiber non-woven web,
The entanglement process and the drying process were performed under the same conditions as in Example 1. Subsequently, a re-relaxation heat treatment was performed using a shrink dryer at a processing temperature of 248 ° C. and an overfeed rate of the feed rate of 2%. Table 4 shows the performance of the obtained composite nonwoven fabric. The obtained composite nonwoven fabric has a single-phase polyethylene terephthalate since the fibers constituting the long-fiber nonwoven web are poor in shrinkage stress of the long-fiber nonwoven web, and are particularly inferior in elasticity and do not exhibit crimp. And was not the object of the present invention.

[0088]

According to the composite nonwoven fabric of the present invention, a short fiber nonwoven web is laminated on at least one surface of a long fiber nonwoven web stretched after a crimp is developed, and the constituent fibers of the long fiber nonwoven web are The constituent fibers of the short fiber nonwoven web are three-dimensionally entangled with each other, and the constituent fibers of the short fiber nonwoven web are three-dimensionally entangled with each other. Since the latent crimp of the constituent fibers of the web has been revealed, the non-woven fabric has irregularities with irregularities in which short fibers are raised, and has excellent mechanical properties, especially excellent peeling strength, excellent dimensional stability and flexibility. It has elasticity. For this reason,
It is suitable not only for industrial materials but also for daily use materials such as clothing and medical treatment, and can be effectively used as agricultural materials. That is, it can be suitably used as an industrial material, for example, as a filter material. As a living material, for example, since it is excellent in flexibility, it can be suitably used for a top sheet such as a sanitary material or a diaper, a gather portion, a withdrawal stopper portion, and other portions,
Since it is excellent in elasticity, it can be suitably used as a haptic material, a supporter, a wristband, a tape base cloth or bandage for taping, and the like. Utilizing good elasticity, it can be used as a mask material for human body. This mask can be applied to masks used in households such as ordinary masks and disposable masks, as well as masks used in food factories and precision machine factories. Furthermore, it can be suitably used for molded articles such as caps having a function as a hat and other molded articles. Further, since the frictional resistance is reduced due to the unevenness of the surface due to the presence of the grain, it can be suitably used for applications such as wipers.

Further, according to the production method of the present invention, this composite nonwoven fabric can be produced efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a sectional form of constituent fibers of a short fiber nonwoven web constituting a composite nonwoven fabric of the present invention.

Claims (4)

[Claims] 1. A composite nonwoven fabric comprising a short fiber nonwoven web laminated on at least one surface of a long fiber nonwoven web,
The long fibers constituting the long-fiber nonwoven web have latent crimping ability and the latent crimp is manifested, and the short fibers constituting the short-fiber nonwoven web are three-dimensionally entangled with each other. A composite nonwoven fabric, comprising: the long fibers and the short fibers are integrally integrated as a whole with three-dimensional entanglement, and have a grain on the surface. 2. The composite nonwoven fabric according to claim 1, wherein the latent crimp has been revealed by re-relaxation heat treatment. 3. A long fiber comprising a fiber in which two kinds of polymer components having mutually different heat shrinkages are juxtaposed along the length direction of the fiber, and a two kinds of polymer having mutually different heat shrinkages. The composite nonwoven fabric according to claim 1, wherein the component is one of fibers arranged in an eccentric core-sheath structure. 4. A long-fiber nonwoven web made of long fibers having latent crimping ability is formed by a spunbond method, and the obtained long-fiber nonwoven web is partially subjected to a heat-pressure welding treatment.
By subjecting the long-fiber nonwoven web that has been subjected to the partial heat-pressing treatment to a heat treatment at a temperature lower than the melting point of the low-melting-point component of the fiber components of the long fibers constituting the nonwoven web, The latent crimp of the long fiber is made obvious to perform a shrinkage treatment, and thereafter, the stretched nonwoven fabric web subjected to the shrinkage treatment is subjected to an extension treatment. Then, at least one surface of the long fiber nonwoven web is made of a short fiber nonwoven fabric. A woven web is laminated, and the laminated nonwoven web is subjected to a high-pressure liquid flow treatment so that the short fibers of the short fiber nonwoven web are three-dimensionally entangled with each other. A method for producing a composite nonwoven fabric, wherein the composite nonwoven fabric is integrally entangled to integrate the laminated nonwoven web as a whole, and then subjected to a re-relaxation heat treatment.