JPH09111635A - Laminated nonwoven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a laminated nonwoven fabric high in bulkiness and excellent in cool feeling and softness. SOLUTION: This nonwoven fabric comprises the three layers where the first and third layers are made of a spun bonded nonwoven fabric made of a continuous long fibers having 0.5-5 denier fineness and 5-50g/m<2> of unit weight and the second layer comprises a nonwoven web made of long fibers or short fibers having 0.5-5 denier size and collected to unit weight of 5-50g/m<2> . The second layer 15 is set between the first layer 2 and the third layer 3 and at the interfaces between the 1st layer and the 2nd layer and between the 2nd layer and the 3nd layer, each fibers is self-fused and anchored by heating. A side-by-side type conjugated long fiber, fiber blending type long fiber or a core and clad type conjugated long fiber are each used in spun bond non-woven fabric for the 1st layer 2 and the 3rd layer 3 and non-woven web for the 2nd layer 15.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is bulky and has excellent cold and warm feeling and flexibility, and can be suitably used as a material for sanitary surface materials such as disposable diapers and sanitary napkins, surgical clothes, and drapes. The present invention relates to a laminated non-woven fabric having a three-layer structure having a nonwoven web made of a composite long fiber or a composite short fiber between two layers of spun-bonded non-woven fabric.

[0002]

2. Description of the Related Art Spunbonded nonwoven fabrics having long fibers as constituent fibers are used for various purposes because they have higher strength and are relatively cheaper than short-fiber nonwoven fabrics having short fibers as constituent fibers. However, it is inferior to the short-fiber non-woven fabric in terms of bulkiness and cold and warm feeling. Here, the cold sensation means a feeling of warmth when the non-woven fabric is touched with a hand, and when it absorbs the body temperature quickly, it feels cold, and when it is inferior to the cold sensation, it feels warm when it is difficult to absorb the body temperature. It is said that it has an excellent feeling of coldness.

It is well known in the art that the bulkiness and coolness of a nonwoven fabric are determined by the amount of air present between the constituent fibers. Therefore, the reason why the spunbonded nonwoven fabric is inferior in bulkiness and cold and warm feeling is that the amount of air existing between the long fibers which are the constituent fibers is smaller than that in the case of the short fiber nonwoven fabric. Therefore, in order to increase the amount of air present between the long fibers, crimped fibers are used as the long fibers, a method of increasing the amount of air present between the long fibers by preventing the long fibers from being densely arranged, Alternatively, a method has been conventionally used in which long fibers having an irregular cross section are used and arranged so that the long fibers do not adhere to each other to increase the amount of air existing between the long fibers.

These two methods are methods of increasing the amount of air existing between the constituent fibers by devising the long fibers themselves which are the constituent fibers, but by devising the layer structure of the non-woven fabric Attempts have also been made to increase the amount of air present in the. JP-A-5-9856 discloses that in order to obtain a laminated nonwoven fabric which is bulky and has an excellent cold and warm feeling, two spunbonded nonwoven fabric layers are laminated and the spunbonded nonwoven fabric layer itself is formed by self-bonding of long fibers to each other. Disclosed is a laminated non-woven fabric provided with a fusion-bonding region and a fusion-bonding region formed by fusion-bonding the long fibers constituting the spunbonded nonwoven fabric layer with the long fibers constituting another spunbonded nonwoven fabric layer.

Further, in Japanese Patent Application Laid-Open No. 6-25959, in order to eliminate the drawbacks of the above-mentioned laminated nonwoven fabric,
A long-fiber fleece layer is provided between two spunbond nonwoven fabric layers, and a fusion area for fusing the long fibers to the spunbond nonwoven fabric itself and the long fibers of the spunbond nonwoven fabric and the long fibers of the long-fiber fleece are fused together. It is disclosed that a fusion bonded area is provided to form a laminated nonwoven fabric in which three layers are integrated to further increase the amount of air present between the constituent fibers, thereby improving bulkiness and cold and warm feeling. However, since these methods rely on thermocompression bonding with a heating embossing roll for fixing and unifying two or three layers, the thickness (bulkness) of the obtained laminated nonwoven fabric depends on the height of the convex portion of the embossing. I was regulated,
There is a drawback that the original thickness of the two or three layers cannot be fully utilized, and this becomes more remarkable as the basis weight of the base material increases.

[0006]

In view of the above situation, the present inventor diligently studied a method for increasing the amount of air existing between constituent fibers in a multilayer structure of a non-woven fabric by devising the layer structure, and laminating the layers. The non-woven fabric has a three-layer structure,
The first layer and the third layer are spunbonded nonwoven fabrics made of continuous long fibers, and the second layer is a nonwoven web made of the same fiber composition,
The second layer is provided between the first layer and the third layer, and the low melting point component or the low melting point fiber of the fibers forming the nonwoven fabric and the nonwoven web is melted by heating to form the first layer. By fixing between the second layer and between the second layer and the third layer, the three layers can be fixed and integrated without limiting the essential thickness of each layer at all, and exist between the constituent fibers. The present inventors have completed the present invention by finding that the amount of air to be generated is extremely remarkably increased, and thereby the cool and warm feeling and flexibility can be remarkably improved. An object of the present invention is to provide a laminated non-woven fabric having a three-layer structure that is extremely bulky and is very excellent in cool and warm feeling and flexibility.

[0007]

The first aspect of the present invention is a laminated nonwoven fabric having a three-layer structure in which a second layer is provided between the first layer and the third layer, and the first layer and the third layer have a fineness of 0. A spunbonded non-woven fabric having a basis weight of 5 to 50 g / m ² formed by accumulating continuous long fibers of 5 to 5 denier, and the second layer accumulating continuous long fibers or short fibers having a fineness of 0.5 to 5 denier. The unit weight is 5-5
A non-woven web of 0 g / m ² in which the fibers forming the respective layers between the first and second layers and between the second and third layers are self-fused by heating. A laminated non-woven fabric having a three-layer structure, which is characterized by being fixed.
A second aspect of the present invention is that the spunbonded nonwoven fabric is composed of a low melting point component and a high melting point component, and the low melting point component is composed of side-by-side type composite long fibers occupying 30 to 70 area% of the total fiber surface area. The non-woven web made of continuous long fibers or short fibers is a laminated nonwoven fabric having a three-layer structure according to the first aspect of the present invention, characterized in that it is composed of side-by-side type composite long fibers or short staple fibers. . In a third aspect of the present invention, the spunbonded nonwoven fabric comprises a mixture of high melting point long fibers and low melting point long fibers, and a mixing ratio of the high melting point long fibers and the low melting point long fibers is a weight ratio, Long fibers: low melting point long fibers = 1: 0.5 to 2 composed of a mixed cotton type long fiber group, and the nonwoven web composed of the continuous long fibers or short fibers is composed of a mixed cotton type long fiber or short fiber. The laminated non-woven fabric having a three-layer structure according to the first aspect of the present invention. In a fourth aspect of the present invention, the spunbonded nonwoven fabric is composed of a core-sheath type composite continuous fiber having a high melting point ethylene-propylene random copolymer as a core component and a low melting point ethylene-propylene random copolymer as a sheath component, The three-layer laminated nonwoven fabric according to the first aspect of the present invention is characterized in that the nonwoven web made of continuous long fibers or short fibers is composed of core-sheath type composite long fibers or short fibers.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A laminated nonwoven fabric according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view of a laminated nonwoven fabric according to the present invention. The laminated nonwoven fabric 1 according to the present invention comprises a first layer 2 made of a spunbonded nonwoven fabric having fusion bonding points 13,
Similarly, a third layer 3 made of a spunbonded nonwoven fabric having a fusion bonding point 14 is provided, and a second layer 15 made of a nonwoven web is provided between the first layer 2 and the third layer 3. There is.
The first layer 2 and the third layer 3 are respectively composed of a low melting point component and a high melting point component, and the low melting point component is 3 of the total fiber surface area.
Side-by-side type composite filaments occupying 0 to 70%,
Alternatively, high melting point long fibers and low melting point long fibers are mixed, and the mixing ratio of the high melting point long fibers and the low melting point long fibers is a weight ratio, and high melting point long fibers: low melting point long fibers = 1: 0. A spunbonded non-woven fabric composed of a mixed cotton type continuous fiber of 5 to 2 or a core-sheath type composite continuous fiber having a high melting point ethylene-propylene random copolymer as a core component and a low melting point ethylene-propylene random copolymer as a sheath component. Is.

Now, the above-mentioned three long fibers constituting the first layer 2 and the third layer 3 for the laminated nonwoven fabric 1 according to the present invention will be further described. First, as can be seen from the schematic cross-sectional view shown in FIG. 2, the side-by-side type composite continuous fiber used in the present invention is a side-by-side type composite continuous fiber 4 having a low melting point component 5 and a high melting point having a substantially half-moon cross section. The component 6 and the component 6 are attached to each other in a state in which both strings are in contact with each other. The difference in melting point between the low melting point component 5 and the high melting point component 6 is 10 to 50 ° C, preferably 20 to 40 ° C. If the melting point difference is less than 10 ° C., only the low melting point component 5 is selectively melted and solidified to make it difficult to fix the long fibers to each other, and the high melting point component 6 tends to be softened or melted to increase the fixed portion. Occurs.

Therefore, the resulting laminated nonwoven fabric 1 (FIG. 1) tends to have reduced flexibility or increased flexural rigidity, which makes it difficult to use as a surface material for sanitary materials. On the other hand, if the melting point difference exceeds 50 ° C., it becomes difficult to spin the side-by-side type composite fiber by a known composite spinning method, which is not suitable. Low melting point component 5 and high melting point component 6
As the polyester, polyamide, polypropylene, polyethylene, copolymers thereof, mixtures thereof, those to which a crystal nucleating agent is added, those containing titanium dioxide therein, etc. Good. In this selection, it is of course necessary that the low melting point component 5 and the high melting point component 6 have the above melting point difference. As a specific example of the low melting point component 5, it is preferable to use an ethylene-propylene random copolymer obtained by randomly polymerizing a mixture of 3% by weight of ethylene and 97% by weight of propylene. On the other hand, high melting point component 6
As a specific example of, it is preferable to use polypropylene having a melting point higher by about 20 ° C. than the ethylene-propylene random copolymer which is the low melting point component 5.

The occupancy rate of the low melting point component 5 in the total surface area of the side-by-side type composite continuous fiber 4 is 30 to 70 area%. When the occupancy of the low melting point component 5 is less than 30%,
The fixed portions between the long fibers due to the melting and solidification of the low melting point component 5 are reduced, and it becomes impossible to give sufficient tensile strength to the obtained laminated nonwoven fabric 1 (FIG. 1). On the contrary, when the occupancy rate of the low melting point component 5 exceeds 70%, the fixed portions between the long fibers due to the melting and solidification of the low melting point component 5 increase, and the flexibility of the obtained laminated nonwoven fabric 1 (FIG. 1) decreases. However, it is not suitable because the bending rigidity becomes large and the texture deteriorates. The side-by-side type composite fiber 4 in the present invention can be manufactured by a known composite melt spinning method.

Next, the mixed cotton type long fibers used in the present invention will be described with reference to FIG. 7 groups of mixed cotton type long fibers,
The high melting point fiber 8 and the low melting point fiber 9 are mixed. The melting point difference between the high melting point fiber 8 and the low melting point fiber 9 is 10 to 5
It is 0 ° C., preferably 20 to 40 ° C. Melting point difference is 10 ℃
If the amount is less than the above, only the low melting point fibers 9 are selectively melted and solidified, and it becomes difficult to fix the long fibers to each other. Therefore, the flexibility of the obtained laminated nonwoven fabric 1 (FIG. 1) tends to decrease, or the bending rigidity tends to increase, which makes it difficult to use this as a surface material for sanitary materials. vice versa,
If the melting point difference exceeds 50 ° C., it becomes difficult to obtain a mixed cotton type composite fiber group by a known composite spinning method. High melting point fiber 8 and low melting point fiber 9
As the material of the above, any of polyester, polyamide, polypropylene, polyethylene, copolymers thereof, mixtures thereof, those to which a crystal nucleating agent has been added, those containing titanium dioxide therein, etc. You can choose In this selection, of course, the high melting point fiber 8 and the low melting point fiber 9 must have the above melting point difference.

As the high melting point fiber 8, it is preferable to use polypropylene fiber. On the other hand, as the low-melting fiber 9, it is preferable to use an ethylene-propylene random copolymer obtained by randomly polymerizing a mixture of 3% by weight of ethylene and 97% by weight of propylene, which has a melting point 20 ° C. lower than that of polypropylene. is there. Further, the mixing ratio of the high-melting point fiber 8 and the low-melting point fiber 9 is, by weight ratio, high-melting point fiber 8: low-melting point fiber 9 = 1: 0.5 to 2. When the ratio of the low melting point fibers 9 is less than 0.5, the fixed portions between the long fibers due to the melting and solidification of the low melting point fibers 9 are reduced, and it becomes impossible to impart sufficient tensile strength to the obtained laminated nonwoven fabric 1 (FIG. 1). So not suitable. On the other hand, when the ratio of the low melting point fibers 9 exceeds 2, the fixed portions between the long fibers due to the melting and solidification of the low melting point fibers 9 increase, and the obtained laminated nonwoven fabric 1 (FIG. 1) is obtained.
The flexibility of the product decreases, and the bending rigidity increases, resulting in poor texture. The high melting point fibers 8 and the low melting point fibers 9 of the mixed cotton type continuous fibers 7 group in the present invention can be produced by a known melt spinning method, and both fibers may be simultaneously spun from the same spinneret. Alternatively, spinning may be performed simultaneously from different spinnerets.

Further, the core-sheath type composite fiber used in the present invention will be described with reference to FIG. Core-sheath type composite fiber 1
The core component 11 of 0 consists of a high melting point ethylene-propylene random copolymer, and the sheath component 12 consists of a low melting point ethylene-propylene random copolymer. The melting point of the ethylene-propylene random copolymer can be adjusted by increasing or decreasing the mol% of ethylene structural units in the copolymer. For example, mol% of ethylene structural unit
The higher the, the lower the melting point of the ethylene-propylene random copolymer. Core component 11 and sheath component 12
And the melting point difference is at least 10 ° C, preferably 10-20
° C. If the melting point difference between the core component 11 and the sheath component 12 is less than 10 ° C., the core component 11 may be softened or melted when the sheath component 12 is melted, and the core component 11 may be melted.
May change in quality.

Both the core component 11 and the sheath component 12 are made of ethylene-propylene random copolymer,
In addition to this copolymer, a crystal nucleating agent or titanium dioxide may be contained. An ethylene-propylene random copolymer obtained by copolymerizing a mixture of 2% by weight of ethylene and 98% by weight of propylene is used as the core component 11, and 4% by weight of ethylene and 96% by weight of propylene are used as the sheath component 12. It is preferred to use an ethylene-propylene random copolymer obtained by copolymerizing a mixture of In this case, the melting point difference between the core component 11 and the sheath component 12 is about 15 ° C. The core-sheath type composite fiber 10 in the present invention can be manufactured by a known composite melt spinning method.

In the present invention, the first layer 2 of the spunbonded non-woven fabric and the third layer 3 of the spunbonded non-woven fabric shown in FIG. 1 are obtained by using any of the materials described above. The fineness of the composite continuous fiber at this time is obtained. Is 0.5 to 5 denier. If the fineness of the long fibers exceeds 5 denier, the flexibility of the first layer 2 and the third layer 3 is reduced, and the resulting laminated nonwoven fabric 1 cannot be used for the surface material of sanitary material, which is not suitable. When the fineness is less than 0.5 denier, the fiber cannot be continuously and stably spun, which is not suitable. The basis weight of the first layer 2 and the third layer 3 is 5 to 50 g / m ² . When the basis weight exceeds 50 g / m ² , the flexibility of the nonwoven fabric layer is reduced, and the obtained laminated nonwoven fabric 1 cannot be used as a surface material for sanitary materials.
On the other hand, when the basis weight is less than 5 g / m ² , the nonwoven fabric is too thin and difficult to handle, which is not suitable.

It should be noted that fusion points 13 and 14 are arranged at intervals on the first layer 2 and the third layer 3 of the spunbonded nonwoven fabric, respectively. These fusion-bonding points 13 and 14 are taken out when a spunbonded non-woven fabric is produced by melt-spinning a thermoplastic resin in a spinning machine and drawing a spun continuous filament filament group with an ejector while stretching it with high-speed high-pressure air. The fiber is melted and solidified by opening the fiber, collecting it on the surface of the support for collection to form a web, and then subjecting this web to thermocompression bonding with an embossing roll, which is thermocompression bonded at the convex portion of the hot embossing roll. It has been formed.

The laminated nonwoven fabric 1 (FIG. 1) of the present invention is provided and laminated such that the second layer 15 made of a nonwoven web is sandwiched between the first layer 2 and the third layer 3. The second layer 15 is made of a composite fiber made of the same material as the above-mentioned composite long fibers constituting the first layer 2 and the third layer 3, and the form thereof may be long fiber or short fiber, and the fineness is 0.5. ~ 5 denier.
When the fibers constituting the second layer 15 of the non-woven web exceed 5 denier, the flexibility of the second layer 15 is reduced, and the obtained laminated nonwoven fabric 1 cannot be used for the surface material of sanitary material.
If the fineness is less than 0.5 denier, the fiber cannot be stably obtained, which is not suitable. The basis weight of the second layer 15 of the nonwoven web is 5 to 50 g / m ² . When the basis weight exceeds 50 g / m ² , the flexibility of the second layer 15 decreases, and the basis weight is 5 g / m.
^If it is less than ² , the web becomes too thin and difficult to handle. The long fibers or the short fibers constituting the second layer 15 may be fixed between the fibers or may not be fixed.
However, since the non-woven web in which the fibers are not fixed to each other also contains air in the non-fixed portion than the fixed non-woven web, it is superior in bulkiness and cold and warm feeling, which is preferable. .

As described above, the first layer 2 made of the spunbonded nonwoven fabric, the second layer 15 made of the non-woven web layer and the third layer 3 made of the spunbonded nonwoven fabric constitute a laminate. Then, between the first layer 2 and the second layer 15 and between the second layer 15 and the third layer 3, the fibers of the low melting point component present on the contact surfaces of the respective layers are melted and solidified by heating, They are fixed by fusing each other. FIG. 5 is a schematic view showing an example of a method for manufacturing a laminated nonwoven fabric according to the present invention.
Specifically, the laminated nonwoven fabric of the present invention can be suitably produced by the following method. That is, first, by a known melt spinning method, low melting point and high melting point thermoplastic resins are extruded from one spinneret or from different spinnerets, melt-spun, and the spun continuous long filament filaments are ejected with a high-speed high-pressure air by an ejector. It is taken up by, opened, and collected on a support (conveyor) surface for collection to form a web, and this web is placed between a heated embossing roll having a large number of convex portions and a smooth roll, Alternatively, it is introduced and passed between a pair of heated embossing rolls having many convex portions. As a result, the long fibers constituting the non-woven web, which come into contact with the convex portions of the embossing roll, are melted and fixed to each other, and the fusion point 13
The first layer 2 consisting of the spunbonded nonwoven fabric having the above is obtained and wound. Similarly, a third layer 3 made of a spunbonded nonwoven fabric having a fusion bonding point 14 is obtained and wound.

Next, while the third layer 3 of the wound spunbonded non-woven fabric is unwound from the winding, the second layer 15 of the nonwoven web is formed thereon. The second layer 15 is formed by, for example, spinning a continuous continuous fiber by a known melt spinning method in the same manner as in the case of a spunbonded nonwoven fabric, stretching it, and then opening the fiber, and dropping it onto the third layer 3. You can do it. afterwards,
The first layer 2 is subsequently unwound from the winding and laminated onto the second layer 15 of the nonwoven web. The first layer 2 and the third layer 3 may be manufactured and laminated on-site without winding. In the through-dryer 17 in which the air heated to the melting point temperature of the fibers of the low melting point component constituting the laminated sheet 16 is circulated Introduced to the first layer 2 and the second layer 1
In the contact surface of No. 5 and the contact surfaces of the second layer 15 and the third layer 3, the fibers of the low melting point components present in the contact surfaces are melted and solidified and fused to each other, and thus the first layer 2 and the second layer 15 And the second layer 15 and the third layer 3 are fixed and integrated,
The laminated nonwoven fabric 1 is formed.

In the above-mentioned manufacturing method, the second layer 15 of the nonwoven web is formed only by directly accumulating the long fibers on the third layer 3 of the spunbonded nonwoven fabric, and the long fibers are not separated from each other. It is not fixed by means such as self-fusion or adhesive. However, in the present invention, the second layer 15 is not directly integrated on the third layer 3 but is separately provided.
You can also get For example, instead of being placed on the third layer 3 by the above method, continuous long fibers are directly collected and collected on a collecting support (conveyor) to form a nonwoven web, and Method to fix the long fibers to each other,
The second layer 1 of the non-woven web is prepared by separately placing the spunbonded non-woven fabric while winding the spunbonded non-woven fabric.
It may be used as No. 5, or the obtained long fibers may be cut into short fibers, and the short fibers may be accumulated to form a carded nonwoven web, which may be used as the second layer 15 of the nonwoven web. . The card nonwoven web may not be fixed between the short fibers, or may be fixed by means such as self-fusing.

As explained above, the laminated non-woven fabric having a three-layer structure of the present invention has a spun bond between the first layer of the spunbonded non-woven fabric and the second layer of the non-woven web and the second layer of the non-woven web. The fibers of low melting point components forming each layer at the contact surface with the third layer of the non-woven fabric are self-fused by heating, and especially the three layers are integrated in the thickness direction without special pressure fusion. Therefore, a large amount of air can be contained between the constituent fibers, which is bulky and extremely excellent in cool and warm feeling and flexibility.

[0023]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which, of course, are not intended to limit the present invention. In Examples and Comparative Examples, “%” means “% by weight” unless otherwise specified.

Example 1 A spunbonded non-woven fabric composed of side-by-side type composite long fibers was manufactured by the following method (see FIG. 2). First,
A polypropylene resin (melting point: 161.7 ° C.) having a melt flow rate of 40 g / 10 min is prepared as a thermoplastic resin raw material for forming the high melting point component 6, and a melt flow rate of 40 g / for a thermoplastic resin raw material for forming the low melting point component 5. 10
Min ethylene-propylene random copolymer (ethylene content 3%, melting point 143.9 ° C.) was prepared. Then, polypropylene is extruded from the first extruder while being heated to 230 ° C. to be melted, while ethylene-propylene random copolymer is extruded from the second extruder while being heated to 230 ° C. and melted, and a side-by-side type composite fiber spinning is performed by a gear pump. The mixture was introduced into a spinneret having holes, and both resins were discharged from the spinning holes such that the total discharge amount of both resins was 1 g / min, to obtain 4 groups of side-by-side type composite long fibers. After that, the 4 groups of the side-by-side type composite long fibers are drawn while being stretched by an air sucker, opened, and collected on a collecting support (conveyor) to form a web. The side-by-side type having a fineness of 2 denier. Four groups of composite long fibers were obtained. The side-by-side type composite filaments 4 were opened by the mutual repulsive force by applying the same charge to each composite filament by a charging device provided below the air sucker.

In the side-by-side type composite continuous fiber 4, the weight ratio of polypropylene and ethylene-propylene random copolymer is polypropylene: ethylene-
Propylene random copolymer = 1: 1. The surface occupancy of the ethylene-propylene random copolymer was 60 area% in the total surface area of the side-by-side type composite continuous fiber 4. Then, the 4 groups of the composite long fibers collected on the collecting conveyor are accumulated,
A web having a basis weight of 20 g / m ² was produced. Next, this web is introduced between a heating embossing roll having a large number of point-shaped projections and a smooth roll to form a spatter-like fusion point 13 (FIG. 1).
Was prepared, and the first layer 2 of the spunbonded nonwoven fabric was manufactured and wound. The tip of the protrusion is round and has a diameter of 0.6 mm.
The temperature of the heated embossing roll was 145 ° C., the temperature of the smoothing roll was 140 ° C., and the linear pressure was 30 kg / cm. The total area of the fusion bonding points 13 was 5 area% with respect to the surface area of the first layer 2 of the spunbonded nonwoven fabric. The third layer 3 of the spunbonded nonwoven fabric having the fusion-bonding points 14 was manufactured by the same method as described above, and was prepared for winding.

Next, the third layer 3 unwound from the above-mentioned winding is placed on the collecting conveyor 18 (FIG. 5), and then the extruder is placed on the third layer 3 in the same manner as described above. From the
A basis weight by accumulating 4 groups of side-by-side type composite long fibers
A second layer 15 of 0 g / m ² nonwoven web was laid down. Then, further, the first layer 2 of the spunbonded nonwoven fabric was laminated on the second layer 15 by unwinding to obtain a laminated sheet 16 of three layers which is not yet integrated. This laminated sheet 16 was introduced into a hot air circulation type through dryer 17 filled with heated air at a temperature of 160 ° C., and this heated air was circulated so as to pass in the thickness direction of the laminated sheet 16.
As a result, the low melting point component 5 composed of the ethylene-propylene random copolymer contained in each layer is melted, and the contact between the first layer 2 and the second layer 15 and between the second layer 15 and the third layer 3 is caused. A laminated non-woven fabric 1 having a basis weight of 50 g / m ² in which the fibers were melt-bonded to each other and the three-layer structure was integrated was obtained.

The laminated non-woven fabric obtained was thickened by the following test method.
Quality, apparent density, thermal conductivity and softness
Was evaluated. Test method (1) Thickness compression tester (model: KES-FB3, Kato Tech Co., Ltd.
Made), measuring area 2cm^TwoWith non-woven fabric 0.5g /
cm^TwoIs applied, the thickness (mm) at that time is measured.
Was. (2) Apparent density The thickness measured in (1) above is Dmm, and the thickness
Fabric weight is Mg / m ^TwoThen, M / (D × 100
Value calculated as 0) (g / cm^Three) Is the apparent density
Was.

(3) Thermal Conductivity The thermal conductivity was measured by using a cool / heat sensation tester (model: KES-F7, manufactured by Kato Tech Co., Ltd.). Thermal conductivity is W × D
It is calculated by / A × ΔT. Here, W is the heat flow loss, D is the thickness of the nonwoven fabric, A is the hot plate area, and ΔT is the temperature difference of the nonwoven fabric. The unit of thermal conductivity is W
/ Cm x ° C. (4) Softness Softness was judged by a tactile test by 20 monitors. The test method was to have the non-woven fabrics obtained in Examples and Comparative Examples be grasped with fingers, to determine which is softer,
One by one from the softest one, 4, 5,
Add 3, 2, or 1 point to get a total of 20 people, 10
Evaluation was made on a scale of 0.

Example 2 A mixed cotton fiber composed of high melting point fiber and low melting point fiber was produced by the following method (see FIG. 3). First, a polypropylene resin having a melt flow rate of 40 g / 10 min (melting point 1
61.7 ° C.), and a melt flow rate of 40 g as a thermoplastic resin raw material for forming the long fibers 9 having a low melting point.
/ 10 g of ethylene-propylene random copolymer (ethylene content 3%, melting point 143.9 ° C.) was prepared. Next, the polypropylene was extruded from the first extruder while being heated to 230 ° C. to be melted, while ethylene-
The propylene random copolymer was extruded from the second extruder while being heated to 230 ° C. while being melted, and was separately introduced into a spinneret having circular spinning holes by a gear pump.
At this time, polypropylene was discharged through 40% of the total number of spinning holes, and ethylene-propylene random copolymer was discharged through the remaining 60% of the holes. In this way, both resins were separately discharged and spun so that the total discharge amount from the spinning holes was 1 g / min, and the obtained long fiber group was drawn by air sucker in the same manner as in Example 1. Then, the fibers were taken out and opened, and the high melting point long fibers 8 and the low melting point long fibers 9 having a fineness of 2.2 denier were accumulated on a collecting conveyor to obtain a mixed cotton type long fiber having a basis weight of 20 g / m ² .

The weight ratio of the high melting long fibers 8 and the low melting long fibers 9 in this nonwoven web was high melting long fibers: low melting long fibers = 1: 1.5. Then, this non-woven web is introduced between a heating embossing roll having a large number of dot-shaped tips and a convex portion having a diameter of 0.6 mm, and a smooth roll to form the spatter-like fusion-bonding points 13. A first layer 2 of spunbond nonwoven was provided and wound up. The temperature of the heating embossing roll was 145 ° C., the temperature of the smoothing roll was 140 ° C., and the linear pressure was 30 kg / cm. Furthermore, the total area of the fusion bonding points 13 is 5 with respect to the surface area of the first layer 2 of the spunbonded nonwoven fabric.
Area%. The third layer 3 of the spunbonded nonwoven fabric having the fusion bonding points 14 is manufactured by the same method as described above,
It was rolled up.

Next, the third layer 3 of the spunbonded non-woven fabric is unwound from the winding and placed on the collecting conveyor 18, and is subsequently produced on the third layer 3 in the same manner as described above. Basis weight 10 consisting of high melting point long fiber 8 and low melting point long fiber 9
A second layer 15 of a g / m ² blended continuous fiber nonwoven web was laminated. Then, further, the first layer 2 of the spunbonded nonwoven fabric was laminated on the second layer 15 by unwinding to obtain a laminated sheet 16 of three layers which is not yet integrated. This laminated sheet 16 was introduced into a hot air circulation type through dryer 17 filled with heated air at a temperature of 160 ° C., and this heated air was circulated so as to pass in the thickness direction of the laminated sheet 16. As a result, the ethylene contained in each layer
Low-melting-point filaments made of propylene random copolymer 9
Melts between the first layer 2 and the second layer 15 and the second layer 15
The fibers were melted and fixed to each other at the contact surface between the third layer 3 and the third layer 3 to obtain a laminated nonwoven fabric 1 having a basis weight of 50 g / m ² in which the three-layer structure was integrated. The obtained laminated nonwoven fabric was tested in the same manner as in Example 1 to evaluate its quality.

Example 3 A core-sheath type composite fiber composed of a high melting point component and a low melting point component was produced by the method described below (see FIG. 4). First, the core component 1
As a thermoplastic resin raw material for forming a sheath component 12, an ethylene-propylene random copolymer having a melt flow rate of 40 g / 10 min (ethylene content 1%, melting point 154.2 ° C.) is prepared as a thermoplastic resin raw material for forming 1 ,
Melt flow rate 40 g / 10 min ethylene-propylene random copolymer (ethylene content 4%, melting point 1
39.9 ° C.) was prepared. Then, the ethylene-propylene random copolymer of the core component 11 was heated to 230 ° C. and extruded from the first extruder while being melted, while the ethylene-propylene random copolymer of the sheath component 12 was heated to 23 ° C.
It is extruded from the second extruder while being heated to 0 ° C. to be melted, introduced into a spinneret having a core-sheath type composite fiber spinning hole by a gear pump, and the total discharge amount of both resins from the spinning hole is 1
The resin was discharged and spun at a rate of g / min, and the spun filament group of the core-sheath type composite continuous fiber 10 was drawn with an air sucker while being drawn with high-speed and high-pressure air in the same manner as in Example 1, opened, and collected. A web composed of the core-sheath type composite long fibers 10 having a fineness of 2 denier and a basis weight of 20 g / m ² was formed by collecting on a support (conveyor) surface for collection. This composite fiber 1
In 0, the weight ratio of both resins was the same.

Then, this web was introduced between the heating embossing roll having a large number of point-like convex portions and the smoothing roll in the same manner as in Example 1 to provide the spatter-like fusing points 13 and the core. The first layer 2 of the spunbonded non-woven fabric made of the sheath type composite fiber was manufactured and wound. The total area of the fusion points 13 is the first layer 2
5 area% with respect to the surface area of The third layer 3 of the spunbonded nonwoven fabric having the fusion-bonding points 14 was manufactured by the same method as described above and wound. Next, the third layer 3 of the spunbonded nonwoven fabric is unwound from the winding and placed on the collecting conveyor 18, and a basis weight of 10 g / m ² produced in the same manner as the above method on the third layer 3. The second layer 15 of the non-woven web composed of the core-sheath type composite long fibers 10 of was laminated. Then, further, the first layer 2 of the spunbonded nonwoven fabric was laminated on the second layer 15 by unwinding to obtain a laminated sheet 16 of three layers which is not yet integrated. This laminated sheet 16 was introduced into a hot air circulation type through dryer 17 filled with heated air at a temperature of 150 ° C., and this heated air was circulated so as to pass in the thickness direction of the laminated sheet 16.
As a result, the sheath component 12 made of the ethylene-propylene random copolymer is melted, and the fibers are melted at the contact surfaces between the first layer 2 and the second layer 15 and between the second layer 15 and the third layer 3. Fixed unit weight with integrated three-layer structure 50g /
A laminated nonwoven fabric 1 of m ² was obtained. The obtained laminated nonwoven fabric was tested in the same manner as in Example 1 to evaluate its quality.

Comparative Example 1 40 g / 1 melt flow rate as a thermoplastic resin raw material
Spinning was performed in the same manner as in Example 1 except that 0 minute polypropylene resin (melting point 161.7 ° C.) was used, and the fineness was 2.
A single-layer spunbonded nonwoven fabric having a denier of 50 g / m ² was produced. The obtained spunbonded nonwoven fabric was tested in the same manner as in Example 1 to evaluate its quality.

Comparative Example 2 Melt flow rate 40 g / 1 as a thermoplastic resin raw material
Spinning was performed in the same manner as in Example 1 except that 0 minute polypropylene resin (melting point 161.7 ° C.) was used, and the fineness was 2.
The first layer 2 and the third layer 3 of the spunbonded non-woven fabric having 1 denier and the basis weight of 20 g / m ² and having the fusion points 13 and 14 of 5 area% respectively were separately manufactured and wound. Next, the third layer 3 is placed on the collecting conveyor 18, and a fineness of 2.1 denier manufactured by the same method as above and a fusion point of 10 g / m ² areal weight. A non-woven second layer 15 of a nonwoven web is formed and laminated, and then a first layer 2 of a spunbonded non-woven fabric is further laminated on the second layer 15, and a three-layer laminated sheet not yet integrated. I got 16. Subsequently, this laminated sheet 16 has the same many scattered point-like convex parts (the tip is round, the diameter is 0.6 mm) as used in Example 1, and the embossing roll heated to a temperature of 145 ° C. and the temperature 140 ° C
Of the first layer, the second layer and the third layer are fused and solidified at one point to form a single layer, which is introduced between the smooth roll and A laminated non-woven fabric was obtained. The total area of the fusion bonding points provided on the obtained laminated nonwoven fabric was 5% by area based on the surface area of the laminated nonwoven fabric. The obtained laminated nonwoven fabric was tested in the same manner as in Example 1 to evaluate its quality.

The results obtained in Examples and Comparative Examples are shown in Table 1.

[0037]

[Table 1]

As is clear from Table 1, the laminated nonwoven fabric of the present invention has an extremely low apparent density and thermal conductivity as compared with the same basis weight, is bulky and is extremely excellent in cold and warm feeling and flexibility (Examples). 1-3). On the other hand, when the spunbonded nonwoven fabric is used alone (Comparative Example 1), the apparent density and the thermal conductivity are high, the bulkiness and the cold and warm feeling are extremely poor, and the flexibility is poor. Even in the case of a laminated non-woven fabric having a three-layer structure, when three layers are concentrated and fused and fixed at one point by a hot embossing roll to be integrated (Comparative Example 2), the thickness is low and the bulkiness is inferior. The thermal conductivity is high, the feeling of cold and cold is poor, and the flexibility is poor.

[0039]

Industrial Applicability The present invention has the effect of providing a laminated nonwoven fabric which is extremely bulky and is very excellent in cool and warm feeling and flexibility.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a laminated nonwoven fabric according to an example of the present invention.

FIG. 2 is a schematic cross-sectional view of a side-by-side type composite fiber used in the present invention.

FIG. 3 is a schematic diagram of a mixed cotton type long fiber used in the present invention.

FIG. 4 is a schematic cross-sectional view of a core-sheath type composite fiber used in the present invention.

FIG. 5 is a schematic view showing an example of a method for manufacturing a laminated nonwoven fabric according to the present invention.

[Explanation of symbols]

 1: Laminated nonwoven fabric 2: First layer of spunbonded nonwoven fabric 3: Third layer of spunbonded nonwoven fabric 4: Side-by-side type composite fiber 5: Low melting point component constituting side-by-side type composite fiber 6: High degree of constituting side-by-side type composite fiber Melting point component 7: Mixed cotton type long fiber 8: High melting point fiber forming mixed cotton type long fiber 9: Low melting point fiber forming mixed cotton type long fiber 10: Core-sheath type composite fiber 11: Core forming core-sheath type composite fiber Component 12: Sheath component constituting core-sheath type composite fiber 13: Fusing point 14: Fusing point 15: Non-woven web second layer 16: Laminated sheet 17: Through dryer 18: Collection conveyor

Claims (4)

[Claims] 1. A laminated non-woven fabric having a three-layer structure, wherein a second layer is provided between a first layer and a third layer, and continuous long fibers having a fineness of 0.5 to 5 denier are accumulated in the first layer and the third layer. Is a spunbonded nonwoven fabric having a basis weight of 5 to 50 g / m ² , and the second layer has a basis weight of 5 to 50 g / m ² formed by accumulating continuous long fibers or short fibers having a fineness of 0.5 to 5 denier. A non-woven web, wherein the fibers forming the respective layers between the first layer and the second layer and between the second layer and the third layer are self-fused and fixed by heating. Laminated non-woven fabric with a three-layer structure characterized by being 2. The spunbonded nonwoven fabric is composed of a low melting point component and a high melting point component, and the low melting point component is composed of side-by-side type composite long fibers occupying 30 to 70 area% of the total fiber surface area, The laminated nonwoven fabric with a three-layer structure according to claim 1, wherein the non-woven web made of continuous long fibers or short fibers is composed of side-by-side type composite long fibers or short fibers. 3. The spunbonded non-woven fabric is obtained by mixing high melting point long fibers and low melting point long fibers, and the mixing ratio of the high melting point long fibers and the low melting point long fibers is a weight ratio. : A low-melting-point long fiber = 1: 0.5 to 2 composed of a mixed cotton-type long fiber group, and the nonwoven web composed of the continuous long fibers or short fibers is composed of a mixed-cotton long fiber or a short fiber. The laminated non-woven fabric having a three-layer structure according to claim 1. 4. The spunbonded nonwoven fabric comprises a high melting point ethylene-propylene random copolymer as a core component,
A low-melting ethylene-propylene random copolymer is used as a sheath component and is composed of a core-sheath type composite continuous fiber, and the nonwoven web made of the continuous continuous fibers or short fibers is composed of a core-sheath type composite continuous fiber or a short fiber. The laminated non-woven fabric having a three-layer structure according to claim 1.