JP2001181955A - Method for producing composite nonwoven fabric and production apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain simple and efficient production of a composite nonwoven fabric that comprises a nonwoven fabric and an elastomer and has a large stretchability in one direction and a high rigidity in the other direction. SOLUTION: A shaking dice 3 that is rotatably supported on the center of the center axis of a forming part 6 is arranged above a depression side of the half-cylindrical forming part 6 for holding a web 7 in a half-cylindrical shape by bending the web 7 in the widthwise direction where the web 7 is conveyed in the longitudinal direction of the web 7. The web 7 comprises a plurality of filaments that are arranged almost in parallel in the longitudinal direction of the web 7 and the molten elastomer is extruded from a nozzle of the shaking dice 3 toward the web 7 that is bent in the half-cylindrical shape on the web guide (6), while the shaking dice 3 is rotated to swing the nozzle of the shaking dice, whereby elastic strands 10 extending in the direction almost crossing the arrangement of the web filaments are laminated on the web 7 and the objective composite nonwoven fabric 8 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a composite nonwoven fabric in which an elastic body is laminated on a nonwoven fabric in which filaments are arranged in almost one direction.

[0002]

2. Description of the Related Art Conventionally, various proposals have been made with respect to a composite sheet of a nonwoven fabric and an elastic body (for example, see Japanese Unexamined Patent Application Publication No.
JP-A-174774, JP-A-9-132856, JP-A-9-279453, JP-A-11-22
No. 2759). Japanese Patent Application Laid-Open No. 8-174664 discloses a composite in which at least two layers of a specific stretched long-fiber web made of a thermoplastic resin and an elastic elastomer layer are laminated, and the elastic direction is regulated. . The drawn long fiber web is formed by drawing a long fiber web formed by spinning a thermoplastic resin in one direction, and arranging the fibers of the web in almost one direction.

The extensible spunbonded nonwoven fabric described in Japanese Patent Application Laid-Open No. 9-132856 is one that exhibits excellent elongation in the transverse direction with extremely small stress, and has excellent surface strength and hand. When making this stretchable spunbonded nonwoven fabric, first, a continuous filament filament group obtained by melt-spinning a thermoplastic resin is drawn by an ejector while stretching it with high-speed, high-pressure air, and the fiber is opened and collected. A web is formed by collecting and accumulating on the support of the above. Then, a continuous long-fiber spunbonded nonwoven fabric having a regular and intermittent first self-fused area is vertically stretched on the web, and the ratio of the width of the nonwoven fabric before stretching to the width of the nonwoven fabric after stretching is 100: It is stretched so as to be 90 to 100: 50, and is formed by providing a regular and intermittent second self-fusing section by a heating roll while maintaining the width of the stretched nonwoven fabric. Specifically, the spunbonded nonwoven fabric is lightly embossed, then stretched in the longitudinal direction to reduce the width, and further embossed.

Japanese Patent Application Laid-Open No. 9-279453 describes a nonwoven fabric having elasticity in only one direction and a production method capable of producing the nonwoven fabric simply and efficiently. In this nonwoven fabric manufacturing method, first, a nonwoven fabric mainly composed of thermoplastic resin fibers is prepared. Next, the unstretched raw material is stretched at a temperature between 60 ° C. lower than the melting point of the resin and 10 ° C. lower than the melting point, at a stretch ratio of 1.4 to 4.0, and at a nip roll interval. Uniaxial stretching is performed under the condition of 0.5 to 10 times the width of the unstretched raw fabric. Thereby, a nonwoven fabric having elasticity in only one direction is manufactured.

[0005] JP-A-11-222759 discloses a composite extensible nonwoven fabric obtained by laminating an extensible nonwoven fabric composed of long fiber filaments and an elastic elastomer. The extensible nonwoven fabric constituting the composite extensible nonwoven fabric is a nonwoven fabric stretched at least three times in at least one direction, is mainly composed of long fiber filaments having a diameter of 3 μm or more and 15 μm or less, and is perpendicular to the stretching direction. In the case of stretching in the direction of
It is expandable by 0% or more. As the form of the elastomer of the composite extensible non-woven fabric, a film, a non-woven fabric, a foam, or the like is used. Is used.

[0006]

However, the above-mentioned conventional composite sheet is a composite sheet of a simple elastic body and a nonwoven fabric, and the directionality of each of the elastic body and the nonwoven fabric is insufficiently regulated. Therefore, these composite sheets had poor stretch characteristics. Furthermore, in the above-mentioned method for producing a composite sheet, the joining step is complicated, and the composite sheet cannot be produced efficiently and inexpensively. In particular, it is desired that the amount of the thermoplastic elastomer used is reduced and the joining is performed efficiently.

Further, as a composite sheet having elasticity,
There is a demand for a composite sheet that requires elasticity only in one of the vertical and horizontal directions depending on the location of a product to be used.

In the conventional composite sheet, if the nonwoven fabric is made of a card web or an air-laid web made of short fibers, if it is manufactured so as to extend only in one direction, the surface strength is weak and short fibers are likely to come off. There were drawbacks. In addition, there is a problem that such a composite sheet requires a long time to produce, and thus is inferior in productivity and high in cost. Also, if the basis weight of the nonwoven fabric is reduced, the required strength cannot be obtained. If the basis weight is 10 g / m ³ or less, the tensile strength is insufficient with a general device, and sufficient tension cannot be applied. There was a problem that breakage and deformation sometimes occurred, making processing difficult.

As a prior art in this field, Japanese Patent Application Laid-Open No.
As described in JP-A-132856, a method of lightly embossing a spunbonded nonwoven fabric, stretching it in the longitudinal direction to reduce its width, and further embossing,
Since multiple embossing steps are required, the steps are complicated and workability is poor. Further, in order to keep the lateral elongation constant, stable physical properties cannot be obtained in many cases because the embossing conditions are delicate. In addition, since the nonwoven fabric is shrunk in the width direction, the thickness at both ends tends to be thick, and as a result, it becomes difficult to manufacture a product having a uniform thickness in the width direction, resulting in a decrease in yield. there were.

JP-A-9-279453 and JP-A-9-279460 also disclose prior arts in this field. However, those disclosed in these publications do not have an appropriate stretching method, However, as in Japanese Patent Application Laid-Open No. 9-132856, there is a problem that it is difficult to obtain a uniform product and the yield is low. These inventions require various requirements for achieving elasticity with a nonwoven fabric alone without being composited with a thermoplastic elastomer. Further, in these inventions, the stretching ratio is set to 1.4 to 4 times. However, considering that the width is reduced as described above, it can be assumed that the stretching ratio defined below is 2 times or less.

Here, the above-mentioned stretching ratio can be defined by the following formula using marks provided at predetermined intervals in the stretching direction of the web before stretching. Stretching ratio = [length between marks after stretching] / [length between marks before stretching] This stretching ratio does not necessarily mean the stretching ratio of individual filaments as in the case of stretching of ordinary long fiber filament yarn. do not do.

[0012] Further, a conventional bonded body of a nonwoven fabric and an elastomer is obtained by combining the elastomer molded in each step with:
It was manufactured by joining in another process. However, in such a method, the elastomer product is once wound up and sent to the next step, and then unwound again and supplied to the next step apparatus. In these winding and unwinding operations, tension is applied to the elastic elastomer product, which makes it difficult to handle the elastomer product, and cannot be said to be an efficient manufacturing method.

An object of the present invention is to easily and efficiently produce a composite nonwoven fabric of a nonwoven fabric and an elastic body, which has high elasticity in one direction, but hardly expands and contracts in the other direction. It is an object of the present invention to provide a method and an apparatus for producing a composite nonwoven fabric which can perform the above.

[0014]

In order to achieve the above-mentioned object, the present invention relates to a method of fabricating a non-woven fabric having a structure in which filaments are arranged in substantially one direction and having rigidity in one direction. A method for producing a composite nonwoven fabric in which elastic strands extending in the intersecting direction are laminated, wherein the nonwoven fabric is curved in a direction intersecting with the filament arranging direction of the nonwoven fabric, thereby providing the filament arranging direction. In a state where the nonwoven fabric is formed into a semi-cylindrical shape so that a cross-sectional shape in a direction substantially orthogonal to the shape of an arc,
A step of transporting the nonwoven fabric in a direction substantially parallel to the filament arrangement direction, and a nozzle portion disposed on the concave side of the semi-cylindrical nonwoven fabric moving in a direction substantially parallel to the filament arrangement direction. Swinging the nozzle portion about the center axis of the semi-cylindrical nonwoven fabric while spinning the strands of the elastic material by extruding the elasticized material toward the nonwoven fabric. Having.

Preferably, before the step of extruding the plasticized material of the elastic body from the nozzle portion, a step of plasticizing the material of the elastic body with heat or a plasticizer is provided.

Further, according to the present invention, a strand of an elastic body extending in a direction intersecting with the arrangement direction of the filaments is laminated on the nonwoven fabric having rigidity in one direction, wherein the filaments are arranged in substantially one direction. An apparatus for manufacturing a composite nonwoven fabric, comprising: bending the nonwoven fabric in a direction intersecting with the arrangement direction of the filaments of the nonwoven fabric, so that a cross-sectional shape in a direction substantially orthogonal to the arrangement direction of the filaments becomes an arc shape. A forming unit for forming the non-woven fabric into a semi-cylindrical shape, a conveying unit configured to convey the non-woven fabric formed into a semi-cylindrical shape by the forming unit in a direction substantially parallel to an arrangement direction of the filaments, and moving by the conveying unit. On the concave side of the semi-cylindrical non-woven fabric, the elastic body swings about the center axis of the semi-cylindrical non-woven fabric, and is plasticized. And a nozzle portion for ejecting material into the nonwoven fabric.

Specifically, the nozzle portion discharges the elastic material plasticized by heat or a plasticizer.

In the invention as described above, when manufacturing a composite nonwoven fabric in which elastic strands are laminated on a nonwoven fabric, first, the filaments have rigidity in one direction in which the filaments are arranged in substantially one direction. The nonwoven fabric is curved in a direction crossing the filament arrangement direction, and the nonwoven fabric is formed into a semi-cylindrical shape by a forming part or the like so that the cross-sectional shape in a direction substantially orthogonal to the filament arrangement direction becomes an arc shape. Then, the semi-cylindrical nonwoven fabric is conveyed by a conveying means or the like in a direction substantially parallel to the filament arrangement direction. Next, while extruding the plasticized elastic material toward the non-woven fabric from the nozzle portion arranged on the concave side of the semi-cylindrical non-woven fabric moving in a direction substantially parallel to the arrangement direction of the filaments, The nozzle portion is swung about the center axis of the non-woven fabric. The elasticized strand is spun by discharging the plasticized material of the elastic body from the nozzle portion, and the nozzle portion swings on the concave side of the semi-cylindrical non-woven fabric as described above, whereby the elasticity is increased. The elastic strands are laminated on the nonwoven so that the strands of the body extend in a direction intersecting the direction of arrangement of the filaments of the nonwoven. As a result, a composite nonwoven fabric is produced in which an elastic strand extending in a direction intersecting with the filament arrangement direction is laminated on a nonwoven fabric in which filaments are arranged in substantially one direction.
This composite nonwoven fabric has rigidity in the arrangement direction of the filaments of the nonwoven fabric constituting the composite nonwoven fabric, and has large elasticity in a direction intersecting with the arrangement direction of the filaments, that is, in a direction in which the elastic strands extend. . Therefore, this composite nonwoven fabric is hardly deformed in one direction, but can be greatly deformed in a direction intersecting the one direction. According to the manufacturing method and the manufacturing method described above, a composite nonwoven fabric having such elasticity can be manufactured easily, efficiently, and efficiently by reducing the basis weight of the nonwoven fabric and the amount of the elastic body used.

In the present invention, the term "longitudinal direction" used to describe the expansion / contraction direction of the composite sheet, the arrangement direction and the stretching direction of the filaments, etc. is used when the nonwoven fabric is manufactured or when the nonwoven fabric is bonded to the elastomer. The machine direction at the time of making
Means the direction perpendicular to the longitudinal direction, that is, the width direction of the nonwoven fabric.

[0020]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing a part of an apparatus for producing a composite nonwoven fabric according to an embodiment of the present invention. In the composite nonwoven fabric manufacturing apparatus of the present embodiment, as shown in FIG. 1, a swinging die 3 is supplied to an extruder 1 that extrudes a rubber elastic material in a molten state via supply pipes 2 a and 2 b and a crosshead 4. It is connected. One end of a supply pipe 2a extending in one direction substantially perpendicular to the direction of gravity is connected to one end of the extruder 1, and one end of a supply pipe 2b is connected to the other end of the supply pipe 2a via a crosshead 4. Is connected. Supply pipe 2b
Extends in one direction substantially perpendicular to the direction of gravity and each of the supply pipes 2a, and a swinging die 3 is connected to the other end of the supply pipe 2b.

The swinging die 3 has an arrow A shown in FIG.
While rotating in the direction of the arrow, the elastomer 9 which is a material of the elastic body is extruded into a thread state in a molten state, thereby forming the elastomer 9 into a strand shape and a portion for laminating the strand-like elastomer 9 on the nonwoven fabric. is there.
The elastomer 9 extruded from the extruder 1 is supplied to the inside of the swinging die 3 through the supply pipe 2a, the crosshead 4, and the supply pipe 2b. Below the swinging die 3, a web 7, which is a nonwoven fabric, is moved by an unillustrated conveying means by an arrow B shown in FIG.
Transported in the direction of

In the present embodiment, the swinging die 3 is connected to the extruder 1 via the supply pipes 2a, 2b and the crosshead 4, but the supply pipes 2a, 2b and the crosshead 4
Alternatively, the swinging die 3 may be connected to the extruder 1 via one curved tube without using the above. That is, the structure for connecting the extruder 1 and the swinging die 3 may be any structure as long as the swinging die 3 is configured to rotate.

The web 7 has a structure in which a plurality of filaments are arranged in a direction substantially parallel to the length direction of the web 7 and has rigidity in the length direction of the web 7. Accordingly, the filaments of the web 7 are arranged in substantially one direction so as to be substantially parallel to the longitudinal direction of the web 7.
The filaments constituting the web 7 are long fiber filaments, and the long fiber filaments used herein may be substantially long fibers, that is, those having an average length exceeding 100 mm. Also, if the filament diameter is 50
Above μm, it is rigid and confounds insufficiently. Preferably 3
0 μm or less, more preferably 25 μm or less. In particular, when a non-woven fabric having a high strength is intended, the filament diameter is desirably 5 μm or more. The diameter and length of the filament are measured by micrograph.

The filaments of the web 7 may be stretched in the direction in which they are arranged. By stretching the filaments in such a manner, the strength of the filaments is increased and the rigidity of the web 7 in the longitudinal direction is increased. Can be.

As the polymer suitable for the filaments of the web 7, thermoplastic resins such as polyethylene, polypropylene, polyester, polyamide, polyvinyl chloride resin, polyurethane, and fluorine resin, and modified resins thereof can be used. . In addition, resins to which wet or dry spinning means can be applied, such as a polyvinyl alcohol-based resin and a polyacrylonitrile-based resin, can also be used, and polyester and polypropylene are particularly preferable.

In the middle of the transport path of the web 7, the web 7
Forming section for bending the web in the width direction thereof, and a semi-cylindrical web guide 6 connected to the forming section.
Is arranged. The web guide 6 extends along the transport direction of the web 7, and the upper surface of the web 7 is formed so that the cross-sectional shape in the direction perpendicular to the transport direction of the web 7 on the upper surface of the web guide 6 becomes an arc. It is curved in a direction substantially orthogonal to the arrangement direction of the filaments. The web guide 6 is fixed so that the groove, that is, the concave portion of the web guide 6 is directed upward, and the web 7 is moved on the web guide 6 by the conveying means in a state where the web 7 is in contact with the upper surface of the web guide 6. .

The term "semi-cylindrical" in the present invention refers to a shape in which the cross-sectional shape in a direction perpendicular to one direction is always a constant arc shape and extends in the one direction. It is not necessarily required to be a semicircle, and it is assumed that an arc defined by an arbitrary angle width can form a “semi-cylindrical” shape. Therefore, the cross-sectional shape of the upper surface of the web guide 6 may be a semicircle, but the cross-sectional shape is defined by any angle width depending on the size of the web guide 6, the width of the web 7, and the like. It may be.

The web 7 is gradually curved in the width direction by the forming portion connected to the upstream end of the web guide 6, and the web 7 is guided onto the web guide 6 by the forming portion. In the web guide 6, the web 7 conveyed comes into contact with the upper surface of the web guide 6, so that the web 7 is kept in a curved state in a direction intersecting with the arrangement direction of the filaments of the web 7. The web 7 curved on the web guide 6 has a semi-cylindrical shape corresponding to the semi-cylindrical shape on the upper surface of the web guide 6. Therefore, the cross-sectional shape of the web 7 on the web guide 6 in a direction substantially orthogonal to the arrangement direction of the filaments is an arc, like the cross-sectional shape of the upper surface of the web guide 6. Above the portion of the web guide 6 on the downstream side in the transport direction of the web 7, that is, on the concave side of the web guide 6, the swinging die 3 is arranged so as to be located on the central axis of the semi-cylindrical web guide 6. Have been.

A nozzle as an opening for extruding the molten elastomer 9 supplied from the extruder 1 into the oscillating die 3 to the outside of the oscillating die 3 is formed on one surface of the oscillating die 3. A plurality is formed. The swinging die 3 is centered on the center axis of the semi-cylindrical web guide 6.
It is supported rotatably in the direction of arrow A shown in FIG. The surface of the swinging die 3 on the nozzle side is the web guide 6
Drive means (not shown) so that the distance from the tip of the nozzle of the swinging die 3 to the web 7 on the web guide 6 is always constant. 3 is rotated. In the present embodiment, a plurality of nozzles are formed on the swinging die 3.
It is sufficient that at least one nozzle is formed on the swinging die 3. When a plurality of nozzles are formed on the swinging die 3, the nozzles may be arranged in accordance with the arrangement pitch of the elastic strands 10 stacked on the web 7 as described later.

As the elastomer 9, a thermoplastic elastomer such as polyolefin, synthetic rubber, polyester, polyamide and polyurethane is used. Of these, synthetic rubbers and polyurethanes obtained by copolymerizing styrene and olefin monomers expand and contract at a high magnification and have a small stress during expansion and contraction, and are suitable as the thermoplastic elastomer in the present invention. Particularly, synthetic rubber of SEBS is most suitable.

In the present embodiment, a thermoplastic elastomer which is plasticized by heat is used as a material of the elastic body, and the thermoplastic elastomer which is plasticized in a molten state is used for the nozzle 5.
Alternatively, a plasticizer such as a solvent may be applied to the elastic material to plasticize the elastic material, and the elastic material may be extruded from the nozzle of the swing die 3 as a thick dope. The low-viscosity dope plasticized by the plasticizer in such a manner is stably extruded toward the inside of the oscillating die 3 by an extruder such as a gear pump, and the extruded pressure causes the plasticized elastic material to be extruded. It is also possible to eject the liquid from the nozzle of the swinging die 3.
Therefore, when plasticizing the elastic material with a plasticizer, a step of applying a plasticizer to the elastic material inside the extruder 1 or outside the extruder 1 is required. Even when the elastic material is plasticized by heat, the elastic material may be melted outside the extruder 1 and the molten elastic material may be supplied to the inside of the extruder 1 or may be extruded. The elastic material may be melted in the machine 1.

The swinging die 3 configured as described above
Then, the extruder 1 applies pressure to the molten elastomer 9 in the swinging die 3 through the inside of each of the supply pipe 2a, the crosshead 4 and the supply pipe 2b. As a result, the melted elastomer 9 in the swinging die 3
Is extruded in a thread form through the nozzle of the swinging die 3, and the strand of the elastomer 9 is spun. Here, the respective nozzles of the swinging dies 3 arranged on the concave side of the web guide 6 move in the width direction of the web guide 6 around the central axis of the web guide 6 as the swinging dies 3 rotate. Swings along the upper surface of the web guide 6 from one end to the other end or from the other end to the one end. Therefore, the melted elastomer 9 is extruded from the nozzle of the swinging die 3 in a thread form.
Are stacked on the web 7 so as to extend in a direction substantially parallel to the width direction of the web 7.

Next, a process of manufacturing a composite nonwoven fabric using the manufacturing apparatus configured as described above will be described.

First, for example, a web 7 wound in a roll shape
Is unwound by a conveying means (not shown), and the unwound web 7 is guided onto the web guide 6 while being curved into a semi-cylindrical shape by a forming portion arranged on the upstream side of the web guide 6. The web 7 conveyed on the web guide 6 is conveyed below the swinging die 3 while maintaining a state of being curved in a semi-cylindrical shape by the shape of the upper surface of the web guide 6. And the web 7 on the web guide 6
Above, while the molten elastomer 9 is extruded from the nozzle of the swinging die 3 into a thread,
Is rotated about the central axis of the semi-cylindrical web 7. The strand of the elastomer 9 is spun by discharging the molten elastomer 9 in a thread form from the nozzle of the swinging die 3 in this manner. Then, while spinning the strands of the elastomer 9 as described above, the nozzle of the swinging die 3 is swung from one end in the width direction of the web 7 to the other end in accordance with the turning operation of the swinging die 3. Thereby, the strands of the elastomer 9 are laminated on the web 7 such that the strands of the elastomer 9 extend in a direction intersecting with the arrangement direction of the filaments of the web 7.
Thereby, as shown in FIG.
Are solidified on the web 7, and as a result, the elastic strands 10 extending in the direction intersecting with the arrangement direction of the filaments are arranged on the web 7 in which the filaments are arranged in almost one direction. Are laminated to produce a web-shaped composite nonwoven fabric 8.

The composite nonwoven fabric 8 has rigidity in the longitudinal direction because the filaments of the web 7 are arranged in the longitudinal direction, and has a horizontal direction crossing the longitudinal direction, that is, a direction in which the elastic strands 10 extend. It has a large elasticity in a substantially parallel direction. Therefore, this composite nonwoven fabric 8
Although it is hardly deformed in one direction, it can be greatly deformed in a direction crossing the one direction.

As described above, in the present embodiment, the elastomer 9 is directly bonded to the web 7 while forming the strands of the elastomer 9 in the process of feeding the web 7. More specifically, in the process of forming the strand of the elastomer 9, the thread-like elastomer 9 reaches the web 7 at a stage where the elastomer 9 has not yet solidified, and the elastomer 9 having reached the web 7 is solidified on the web 7. It is bonded to the web 7. Thereby, the composite nonwoven fabric 8 having elasticity in the lateral direction can be easily and efficiently manufactured. Further, since the elastic strands 10 formed by coagulation of the thread-like elastomer 9 are arranged in the horizontal direction, a small amount of the elastomer 9 can exert the elastic property in the horizontal direction.

As described above, according to the manufacturing method and the manufacturing apparatus of the present embodiment, the elastomer 9 can be easily and rapidly formed into a strand shape. Further, by forming the elastomer 9 in a strand shape on the web 7 as described above, it is possible to effectively use expensive elastomer in a small amount. Therefore, from the viewpoint of reducing the amount of the elastomer used, it is preferable to arrange the elastic strands 10 at intervals or to arrange the elastic strands 10 at intervals. However, the web-like composite nonwoven fabric 8
If sufficient elasticity in the horizontal direction can be obtained, the elastic strands 10 may be arranged so that some of them intersect or overlap. Alternatively, the composite nonwoven fabric 8 may be configured by arranging the elastic strands 10 without gaps.

Furthermore, since the filaments of the web 7 are efficiently arranged in the longitudinal direction, the web 7
Is suitable for obtaining elongation in a direction intersecting with the direction in which the filaments are arranged. Even if the basis weight of the web 7 is small, the elongation characteristics in the lateral direction are not impaired. That is, even if the basis weight of the web 7 is small, the elastic property of the composite nonwoven fabric 8 in the lateral direction due to the elastic strands 10 is not impaired. Therefore, the basis weight of the web 7 is reduced and the web 7
And the cost of the composite nonwoven fabric 8 can be reduced.

From the above, the method and apparatus for manufacturing a composite nonwoven fabric according to the present embodiment are more effective than the conventional method for manufacturing a composite sheet comprising a nonwoven fabric and an elastic body, in that the composite nonwoven fabric has the above-described elasticity. 8, the yield is good by reducing the basis weight of the nonwoven fabric and the amount of the elastic body,
It can be manufactured simply and efficiently. Therefore, according to the manufacturing method and the manufacturing apparatus of this embodiment, such a composite nonwoven fabric 8 is excellent in mass productivity, and the composite nonwoven fabric 8 can be manufactured at low cost.

In the web 7 used in the present invention, the filaments constituting the web 7 need to be arranged in substantially one direction, and more preferably, the filaments are stretched in one direction. The most important reason is that the arrangement of the filaments in one direction facilitates deformation in the direction perpendicular to the arrangement direction. Further, since the web 7 is difficult to deform largely in the filament arrangement direction, the composite nonwoven fabric 8 using such a web 7 has dimensional stability and is convenient as a product. Therefore, the web 7 is not particularly limited as long as the filaments are arranged in one direction.

The composite nonwoven fabric 8 produced by the method and apparatus for producing a composite nonwoven fabric of the present embodiment is particularly suitable for use as a base material for a binding tape, a stretchable portion for sanitary products, an interlining cloth for clothing, a stretchable bandage base material, Elastic bandages, medical supporters, elastic parts for disposable diapers, elastic materials for clothing such as pulp base material, collars, sleeves and waist, elastic parts for medical surgical gowns, caps, etc.
It is a sheet suitable for a stretchable elastic portion such as an artificial leather cloth, a glove base cloth, a suspender, a belt, a sock stop, a mask base cloth, an arm cover stretchable clothing base cloth, and a corset.

[0043]

As described above, according to the present invention, a non-woven fabric having filaments arranged in substantially one direction is curved in a direction intersecting the filament arrangement direction to form a semi-cylindrical non-woven fabric. While extruding the plasticized elastic material toward the semi-cylindrical non-woven fabric from the nozzle portion arranged on the concave side, the nozzle portion is swung about substantially the center axis of the semi-cylindrical non-woven fabric. By doing so, a composite nonwoven fabric having rigidity in one direction and having large elasticity in a direction intersecting with the one direction has a good yield even if the basis weight of the nonwoven fabric and the usage amount of the elastic body are reduced, and is simple and efficient. Can be manufactured. As a result, there is an effect that the composite nonwoven fabric having the above-described elastic properties can be mass-produced at low cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a part of a composite nonwoven fabric manufacturing apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extruder 2a, 2b Supply pipe 3 Swinging die 4 Crosshead 6 Web guide 7 Web 8 Composite nonwoven fabric 9 Elastomer 10 Elastic body strand

Continued on the front page F term (reference) 4C098 AA01 AA09 BB20 BC03 CC14 DD10 4L047 AA14 AA21 AA25 AB03 BA08 BD02 CA03 CA05 CA16 CA19 CB01 CC01 CC02 CC03 CC04 CC05 EA05 EA22

Claims (6)

[Claims] 1. A composite nonwoven fabric in which elastic strands extending in a direction intersecting with a direction in which the filaments are arranged are laminated on the nonwoven fabric having rigidity in one direction, wherein the filaments are arranged in substantially one direction. The method of manufacturing the non-woven fabric, wherein the non-woven fabric is curved in a direction intersecting with the arrangement direction of the filaments of the non-woven fabric, so that a cross-sectional shape in a direction substantially orthogonal to the arrangement direction of the filaments becomes an arc shape. Transporting the nonwoven fabric in a direction substantially parallel to the arrangement direction of the filaments in a state in which the nonwoven fabric is formed into a semi-cylindrical shape; and a concave side of the semi-cylindrical nonwoven fabric moving in a direction substantially parallel to the arrangement direction of the filaments. Spinning the strands of the elastic body by extruding the plasticized material of the elastic body toward the non-woven fabric from the nozzle portion arranged at While method of producing a composite nonwoven fabric and a step of then substantially around the central axis of the semi-cylindrical of said nonwoven oscillating the nozzle portion. 2. The method for producing a composite nonwoven fabric according to claim 1, further comprising a step of plasticizing the material of the elastic body by heat before the step of extruding the plasticized material of the elastic body from the nozzle portion. . 3. The production of the composite nonwoven fabric according to claim 1, further comprising a step of plasticizing the material of the elastic body with a plasticizer before extruding the plasticized material of the elastic body from the nozzle portion. Method. 4. A composite nonwoven fabric in which elastic strands extending in a direction intersecting with the arrangement direction of the filaments are laminated on the nonwoven fabric having rigidity in one direction, wherein the filaments are arranged in substantially one direction. The non-woven fabric, wherein the non-woven fabric is curved in a direction intersecting with the arrangement direction of the filaments of the non-woven fabric so that a cross-sectional shape in a direction substantially orthogonal to the arrangement direction of the filaments becomes an arc shape. Forming a semi-cylindrical shape, conveying means for conveying the non-woven fabric semi-cylindrical by the forming part in a direction substantially parallel to the arrangement direction of the filaments, and a semi-cylindrical shape moved by the conveying means. On the concave side of the non-woven fabric, the semi-cylindrical non-woven fabric is oscillated about the center axis of the non-woven fabric, and the plasticized material of the elastic body is non-woven. An apparatus for manufacturing a composite nonwoven fabric having a nozzle portion discharging toward a cloth. 5. The composite nonwoven fabric manufacturing apparatus according to claim 4, wherein the nozzle portion discharges the material of the elastic body plasticized by heat. 6. The nozzle part discharges the material of the elastic body plasticized by a plasticizer.
2. The apparatus for producing a composite nonwoven fabric according to item 1.