JPH07189107A - Laminated nonwoven fabric - Google Patents

Abstract

PURPOSE:To obtain bulky laminated nonwoven fabric having an excellent low- temperature feeling. CONSTITUTION:This laminated nonwoven fabric comprises three layers obtained by laying a second short fiber web 2 having no fusion bonding area before lamination between two sheets of first and third spunbonded nonwoven fabrics 1 and 3. The laminated nonwoven fabric contains at least 5wt.% of short fibers capable of mutually being bonded to filaments constituting the spunbonded nonwoven fabrics at a temperature to enable the filaments to be fusion bonded, the first and the third spunbonded nonwoven fabrics 1 and 3 have first and second fusion bonding areas 4 and 5, in which the filaments constituting the spunbonded nonwoven fabric are bonded by thermal self fusion bonding and the whole fusion bonding area is 4-10% of the area of the spunbonded nonwoven fabric, at intervals, respectively and a third fusion bonding area 6, in which the laminated nonwoven fabric composed of the three layers is partially fusion bonded by heat and the whole area of the whole fusion bonded area is 2-6% of the area of the laminated nonwoven fabric. The laminated nonwoven fabric is suitable used as a surface material of a sanitary material such as sanitary napkin, surgical clothing, covering cloth, cataplasm ground fabric, etc.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated nonwoven fabric composed of three layers. More specifically, the present invention is bulky and excellent in cold and warm feeling, and is particularly suitable as a material for surface materials of sanitary materials such as disposable diapers and sanitary napkins, surgical clothes, hanging cloths, and Hap material base cloths. It relates to a laminated nonwoven fabric that can be used.

[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 cool and warm feeling. Here, the cold sensation refers to the sensation of warmth when the nonwoven fabric is touched by hand, and when quickly absorbing the body temperature, it feels cold and is inferior to the cold sensation. vice versa,
When it is difficult to absorb body temperature, it feels warm, and in this case, it is said that it has an excellent feeling of coldness.

It is well known in the art that the bulkiness and cool and warm feeling 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 existing between the long fibers, crimpability is conventionally imparted to the long fibers, and by using this fiber, the long fibers are prevented from being densely arranged, and A method of increasing the amount of air present or a method of increasing the amount of air present between the long fibers by using long fibers having an irregular cross section and arranging them so that the long fibers do not adhere to each other is used. However, even if such fibers are used alone, there is a limit in allowing a large amount of air to exist between the constituent fibers.

It has also been proposed to increase the amount of air present between the constituent fibers by a method different from the above two methods. For example, JP-A-5-9856 and JP-A-5-9856
Japanese Patent No. 179557 discloses that two spunbonded nonwoven fabrics each having a self-fusion point are laminated and then partially heated and pressed to fuse the filaments forming the two nonwoven fabrics together. Thus, a laminated nonwoven fabric which is bulky and has an excellent cool and warm feeling obtained by providing a third fusion bonding area, and a method for producing the same are disclosed. Also, JP-A-5-209355
The publication discloses a laminated nonwoven fabric which does not have a self-fusing area in the second spunbonded nonwoven fabric and has a lower apparent density than the first spunbonded nonwoven fabric, and a method for producing the same. However, in these methods, the amount of air existing between the constituent fibers is increased by devising the layer structure of the spunbonded nonwoven fabric composed of long fibers. It is the current situation that the presence of air only between the layers does not sufficiently improve the thermal sensation due to the high thermal conductivity due to the small amount of air.

[0005]

In view of the above situation, the inventors of the present invention have earnestly studied means for allowing a large amount of air to exist between fibers of a long fiber non-woven fabric, and as a result, spun bond non-woven fabric composed of laminated long fibers. The amount of air existing between the constituent fibers is increased by providing a three-layer laminated structure in which a cotton-like short fiber layer having no fusion zone is provided between the fibers and a specific fusion zone is provided on the outer layer. Then, they found that the cold and warm feeling can be remarkably improved, and completed the present invention. Therefore, an object of the present invention is to provide a laminated nonwoven fabric which is bulky and has a small thermal conductivity, the surface of the nonwoven fabric is smooth and has strength, and is excellent in cool and warm feeling and flexibility.

[0006]

The present invention has a fineness of 1-5.
It is composed of three layers, in which a short fiber web having a fineness of 1 to 5 denier and having no fusion zone before lamination is provided between the layers of the first and third spunbonded nonwoven fabrics of continuous denier continuous fibers. The first and third spunbonded non-woven fabrics, wherein the short fiber web contains at least 5% by weight of short fibers capable of being fused with the fibers constituting the spunbonded non-woven fabric. But,
The long fibers constituting the spunbonded nonwoven fabric are bonded together by thermal self-bonding, and the total area of the entire fusion bonded area comprises the first and second fusion bonded areas which are in the range of 4 to 10% of the area of the spunbonded nonwoven fabric. The laminated non-woven fabric composed of the above-mentioned three layers, which are spaced apart from each other, are partially fused by heat, and the total area of the entire fusion-bonded region is in the range of 2 to 6% of the area of the laminated non-woven fabric. A laminated non-woven fabric having a third fused area.

The laminated non-woven fabric according to the present invention contains at least 5% by weight of short fibers which are heat-sealed with the long fibers constituting the spunbonded non-woven fabric, and has a short-fiber web layer having no heat-sealed area in the middle before laminating. Further, it has a structure in which spunbonded nonwoven fabric layers made of long fibers having heat-sealing areas are laminated on both sides thereof. When the content of the heat-fusible short fibers forming the short fiber layer is less than 5% by weight, it is insufficient to provide the third fusion zone formed by partial fusion by heat after forming the laminated nonwoven fabric. As a result, the strength of the laminated nonwoven fabric is insufficient, and at the same time, delamination occurs, which is not suitable. For both the heat-fusible short fibers and the non-heat-fusible short fibers, those having a fineness of 1 to 5 denier are preferably used. If the fineness exceeds 5 denier, the flexibility of the short fiber web layer decreases, and the resulting laminated nonwoven fabric cannot be used in applications such as surface materials for sanitary materials. Further, if the fineness is less than 1 denier, a problem that the short fibers cannot be opened neatly occurs at the stage of producing the short fibers, and thus it is necessary to make the production conditions strict and not preferable.

Before laminating, there is no fused area, but after laminating, the long fibers that make up the spunbonded nonwoven fabric and the short fibers that make up the short fiber web to form the partial fusion by heat. Of these, the short fibers that can be fused account for at least 5% by weight based on the total weight of the short fibers, but the short fibers that can be fused with the long fibers constituting the spunbonded nonwoven fabric of the laminated nonwoven fabric can be fused with each other at a temperature at which they can be fused. It is necessary that the short fibers that can be used be selected and used. That is, when the long fibers and short fibers are partially fused by heat under pressure to form the third fusion zone, the melting point of the long fibers and the melting point of the short fibers capable of being fused are at least at the same level. There must be or a combination in which the melting point of the long fibers is higher than that of the short fibers. Typical examples of such fusible short fibers include polyolefin short fibers such as polyethylene (melting point 125 to 135 ° C) and polypropylene (melting point 155 to 170 ° C), polyester short fibers (melting point 260 to 260). Two
70 ° C.), polyamide type short fibers (melting point is, for example, nylon 6 210 to 220 ° C., nylon 66 250 to 26
0 ° C.) and the like.

On the other hand, as the short fibers having no fusion property,
Cotton fiber, rayon short fiber, etc. can be mentioned,
It is appropriately selected and used. The fiber length of these short fibers is 1
It is appropriately selected and used according to the purpose from the range of 0 to 70 mm. When the fiber length is less than 10 mm, the short fiber layer has a high density and is not suitable for containing air. If the fiber length becomes higher than 70 mm, the layer structure cannot be maintained unless the short fibers are fixed by an adhesive or heat fusion, which is not suitable for containing a large amount of air. In addition, as the shape of the short fiber, a normal known linear short fiber may, of course, be a crimped short fiber or a short fiber having an atypical cross section.

Further, the basis weight of the short fiber web is 5 to 10
0 g / m ^2, preferably in the range of 5 to 70 g / m ^2.
When the basis weight exceeds 100 g / m ² , the flexibility of the short fiber web decreases, and the resulting laminated non-woven fabric cannot be used as a surface material for sanitary materials, and the basis weight is 5 g / m ²
If it is less than the above range, the short fiber web itself becomes too thin to be handled, and the amount of air to be contained is insufficient, which is not suitable.

The structure of the laminated non-woven fabric of the present invention and the spun-bonded non-woven fabric composed of the long fibers used in the present invention are shown in FIG.
Further, based on, the fineness of the long fibers constituting the first spunbonded nonwoven fabric 1 is 1 to 5 denier, and when the fineness of the long fibers exceeds 5 denier,
This is not suitable because the flexibility of the first spunbonded non-woven fabric 1 is lowered, and naturally the flexibility of the laminated non-woven fabric obtained is also deteriorated, and the first spun-bonded non-woven fabric 1 cannot be used for a surface material of a sanitary material. Also,
When the fineness is less than 1 denier, excellent flexibility is obtained, but spunbonded nonwoven fabric cannot be produced at high speed, which is not suitable. The weight of spunbonded nonwoven fabric is 5 to 5
0 g / m ^2, preferably in the range of 5 to 30 g / m ^2.
If the basis weight is higher than 50 g / m ² , the flexibility of the spunbonded nonwoven fabric is reduced as in the case of fineness, and therefore the obtained laminated nonwoven fabric cannot be used for applications such as surface materials for sanitary materials. . If the basis weight is less than 5 g / m ^2, it is not suitable because it becomes too thin and difficult to handle, and also the strength becomes weak and it is not suitable for various applications.

The first spunbonded nonwoven fabric 1 is provided with first fused regions 4 at intervals, which are formed by self-fusion between the long fibers constituting the spunbonded nonwoven fabric. For example, the first fusion-bonding area 4 may be a point fusion-bonding area, which may be arranged in a scattered spot, or the fusion-bonding area may be a line-fusion bonding area and arranged in a grid pattern. Also,
In such a fused area, long fibers are partially fused by heat and the total area of the entire fused area is in the range of 4 to 10% of the area of the spunbonded nonwoven fabric. If this total area exceeds 10% and is large, the spunbonded nonwoven fabric obtained lacks in bulkiness and flexibility, and if it is less than 4%, the strength is insufficient, so both are not suitable.

The fusion zone is formed between a heated embossing roll having a large number of convex portions and a smooth roll, or between a pair of heated embossing rolls having a large number of convex portions.
Introduce a non-woven web. As a result, the protrusions of the embossing roll melt the filaments that make up the nonwoven web and self fuse to each other, resulting in a spunbonded nonwoven fabric layer having fused regions. Alternatively, the heat-sealing area may be formed by introducing the heat-dissipating zone into a gap between an ultrasonic wave horn and an uneven roll having a large number of projections and depressions. The shape of the convex part of the embossing roll is pinpoint, diamond, rectangle,
The pattern is selected from T patterns and the like, but is not particularly limited. The density of the fusion-bonded area is appropriately selected and used from the range of 10 to 50 pieces / cm ² . When the density is less than 10 pieces / cm ² , the strength of the nonwoven fabric is not sufficiently expressed and the density is 50 pieces / c.
When it is higher than m ² , the flexibility and bulkiness are deteriorated, which is not suitable.

On the other hand, the fineness and basis weight of the third spunbonded nonwoven fabric 3 are the same as those of the first spunbonded nonwoven fabric 1, but the fineness and the basis weight of the first and third spunbonded nonwoven fabrics are the same. Or you can change the level. The third spunbonded nonwoven fabric 3 has a second fused area 5 similar to the first fused area 4 of the first spunbonded nonwoven fabric 1.
Are spaced apart. This fusion-bonded area is also formed by self-fusion of the long fibers forming the third spunbonded nonwoven fabric 3. In this case as well, the total area of the entire fusion-bonded area is in the range of 4 to 10% of the area of this spunbonded nonwoven fabric for the same reason as in the case of the first spunbonded nonwoven fabric 1, but the front and back of the laminated nonwoven fabric are bulky. When changing the flexibility, spunbonded non-woven fabrics having different total areas of the entire fusion-bonded area may be used. As described above, in the first spunbonded nonwoven fabric and the third spunbonded nonwoven fabric, various bulkiness and flexibility can be obtained by arbitrarily selecting and combining the fineness, the basis weight, the shape and the area ratio of the fusion-bonded area, and using the laminated nonwoven fabric. Can be given to.

As the long fibers constituting the first spunbonded nonwoven fabric 1 and the third spunbonded nonwoven fabric 3, conventionally known long fibers can be used. For example, polyolefin long fibers such as polyethylene and polypropylene, and polyester. Examples include long filaments and polyamide long filaments. The form of the long fibers may be a known straight long fiber, a crimpable long fiber or a long fiber having an atypical cross section. Further, it may be a single component or a composite component.

As described above, the laminated nonwoven fabric of the present invention has a structure in which the first and third spunbonded nonwoven fabrics 1 and 3 and the second short fiber web 2 having no fused area before lamination are laminated. After the lamination, the temperature at which the long fibers constituting the first and third spunbonded nonwoven fabrics 1 and 3 and the long fibers constituting the spunbonded nonwoven fabric having a fineness of 1 to 5 denier can be fused. In addition, the short fibers constituting the short fiber web 2 containing at least 5% by weight of short fibers that can be fused with each other and having no fusion zone before lamination are partially formed by heat after forming a laminated nonwoven fabric. To form a third fusion-bonding area 6, and by providing the third fusion-bonding area 6 at intervals in the laminated nonwoven fabric, the constitution of the obtained laminated nonwoven fabric is firmly held. .

That is, in the laminated nonwoven fabric of the present invention, the first and second fused regions 4 and 5 by self-fusion between the long fibers constituting the first and third spunbonded nonwoven fabrics 1 and 3. And a third fiber formed by thermal fusion of the fusible short fibers forming the second short fiber web 2 and the long fibers forming the first and third spunbonded nonwoven fabrics 1 and 3 after being laminated. There are three types of fusion zones, which are fusion zones 6. The third fusion-bonding area 6 is also in the form of dots or a grid like the first and second fusion-bonding areas 4 and 5, and is 5-4.
With the adhesion density of 0 pieces / cm ² , and the total area of the fusion zone,
It is provided at intervals in the range of 2 to 6% of the area of the laminated nonwoven fabric. When the adhesion density and the total area of the fusion-bonded area are larger than the above ranges, the resulting laminated nonwoven fabric lacks bulkiness and flexibility, and conversely, when it becomes smaller, the laminated nonwoven fabric has insufficient strength and delamination occurs. So they are not suitable together.

The laminated nonwoven fabric according to the present invention can be specifically manufactured by the method described below. That is,
First, long fibers are spun and stretched by a conventionally known melt spinning method,
It is collected into sheets to form a nonwoven web. Thereafter, the obtained nonwoven web is introduced between a heated embossing roll having a large number of protrusions and a smooth roll, or between a pair of heated embossing rolls having a plurality of protrusions. As a result, by the convex portion of the embossing roll, the long fibers constituting the non-woven web are melted and fixed to each other,
A first spunbonded nonwoven fabric 1 having a first fused area 4 is obtained. Moreover, the 3rd spunbonded nonwoven fabric 3 which has the 2nd fusion bonding area 5 is obtained similarly to having obtained the 1st spunbonded nonwoven fabric 1.

Next, conventionally known short fibers are accumulated to form a short fiber fleece layer, or short fibers formed by, for example, the card method or the air lay method are accumulated in a sheet form to form a short fiber web. Then, this is laminated on the first spunbonded nonwoven fabric 1 as the second short fiber web 2. Furthermore, the third spunbonded nonwoven fabric 3 is formed on the second short fiber web 2.
Are stacked. As a result, a laminated sheet is obtained in which the second short fiber web 2 having no fused area is laminated between the first spunbonded nonwoven fabric 1 and the third spunbonded nonwoven fabric 3. Then, the obtained laminated nonwoven fabric sheet is introduced between a heated embossing roll having a large number of convex portions and a smooth roll, or between a pair of heated embossing rolls having a large number of convex portions. As a result, the third fused area 6 is formed, and a laminated nonwoven fabric in which the three kinds of layers are firmly held is obtained.

Since the present invention is configured as described above, a large amount of air is contained between the short fibers constituting the short fiber web, and moreover, air is retained between the long fibers of the spunbonded nonwoven fabric. It is possible to obtain a flexible laminated non-woven fabric which is extremely excellent in feeling and bulkiness.

[0021]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 A polypropylene resin having a melt flow rate of 40 and a melting point of 165 ° C. was heated to a temperature of 230 ° C. to be melted, and long fibers were obtained by a conventionally known melt spinning method. Immediately thereafter, the obtained long fibers were drawn into long fibers having a fineness of 2 denier, which were collected on a collecting conveyor to obtain a nonwoven web. This non-woven web was introduced between a hot embossing roll having a large number of point-like projections and a smooth roll to provide spot-like first fusion-bonded areas to obtain a first spunbonded nonwoven fabric. This first spunbonded nonwoven fabric has a basis weight of 8 g / m ² , and the total area of the first fusion bonded area is 5 with respect to the area of the spunbonded nonwoven fabric.
%, And the adhesive density was 14 pieces / cm ² . Further, the tip of the dot-shaped convex portion provided on the heating embossing roll was round (pinpoint) and had a diameter of 0.6 mm, and the temperature of the embossing roll was 130 ° C. Further, the linear pressure between the embossing roll and the smoothing roll was 80 kg / cm.
Similarly to the case of the first spunbonded nonwoven fabric, a third spunbonded nonwoven fabric having the same specifications as the first spunbonded nonwoven fabric and having the second fused region was obtained.

Next, polyethylene short fibers having a fineness of 2 denier (melting point: 133 ° C., fiber length: 51 mm) were mixed with a roller card to form a nonwoven web having a basis weight of 8 g / m ² . This web was assembled on the first spunbond nonwoven to form a second staple fiber web layer having no fused areas. And the said 3rd spunbonded nonwoven fabric was laminated | stacked on the 2nd short fiber web formed on the 1st spunbonded nonwoven fabric layer, and the sheet was obtained. This sheet was introduced between a heated embossing roll having a large number of linear protrusions and a smooth roll to obtain a laminated nonwoven fabric provided with a third fusion bonding area. The total area of the third fusion bonded area was 2.8% with respect to the area of the first spunbonded nonwoven fabric of the laminated nonwoven fabric, and the adhesive density was 8 pieces / cm ² . The linear protrusions provided on the heating embossing roll are in a lattice pattern with a protrusion interval of 10 mm, the temperature of the embossing roll is 130 ° C., and the linear pressure between the embossing roll and the smoothing roll is 50 kg. Was / cm.

[0024]

Example 2 The total area of the first heat-bonding zone 4 of the first spunbonded nonwoven fabric 1 and the total area of the second heat-bonding zone 5 of the third spunbonded nonwoven fabric 3 are respectively relative to the area of the spunbonded nonwoven fabric. A laminated nonwoven fabric was produced in the same manner as in Example 1 except that the adhesive density was 9% and the adhesive density was 25 pieces / cm ² .

[0025]

[Example 3] The total area of the third fusion bonded area was 5% with respect to the area of the first spunbonded nonwoven fabric of the laminated nonwoven fabric, and the adhesion density was 1
A laminated nonwoven fabric was produced in the same manner as in Example 1 except that the number was 4 pieces / cm ² .

[0026]

Example 4 The short fibers constituting the second short fiber web layer were made of rayon short fibers having a fineness of 2 denier (fiber length 51 mm) 94.
A laminated non-woven fabric was produced in the same manner as in Example 1 except that 6% by weight of polyethylene short fibers (melting point: 133 ° C., fiber length: 51 mm) having a weight% and a fineness of 2 denier were used.

[0027]

Example 5 A long fiber nonwoven fabric and a short fiber web were introduced into the gap between an ultrasonic wave horn and an uneven roll at 130 ° C. having a large number of convex portions (0.6 mm round shape) arranged at intervals. Then, a laminated non-woven fabric was produced in the same manner as in Example 1 except that the first, second and third fused regions were formed.

[0028]

[Comparative Example 1] Example 1 except that the basis weight was 24 g / m ^2.
A spunbonded nonwoven fabric was manufactured with the same specifications as the first spunbonded nonwoven fabric layer.

[0029]

[Comparative Example 2] except that the basis weight is first spunbonded nonwoven fabric and the basis weight of 12 g / m ² using only the third spunbonded nonwoven 12 g / m ² is composed of the same way two sheets of nonwoven fabric as in Example 1 To produce a laminated nonwoven fabric.

[0030]

[Comparative Example 3] A short fiber composed of 85% by weight of the polypropylene short fibers having a fineness of 2 denier (melting point 165 ° C) and 15% by weight of polypropylene short fibers having a fineness of 2 denier (melting point 127 ° C) was mixed with a roller card. , Unit weight 24g
/ M ² of short fiber web is formed and then this web is
It was introduced into a hot air dryer heated to 30 ° C. to obtain a short fiber nonwoven fabric.

[0031]

[Comparative Example 4] The total area of the first heat-bonding zone 4 of the first spunbonded nonwoven fabric 1 and the total area of the second heat-bonding zone 5 of the third spunbonded nonwoven fabric 3 are respectively relative to the area of the spunbonded nonwoven fabric. 12%, adhesive density 33 pieces / cm ² each
A laminated nonwoven fabric was produced in the same manner as in Example 1 except that

[0032]

[Comparative Example 5] A laminated non-woven fabric was prepared in the same manner as in Example 1 except that the total area of the third fusion bonded area was 1% of the area of the first spun-bonded non-woven fabric of the laminated non-woven fabric, and the adhesive density was 3 pieces / cm ^2. Was manufactured.

[0033]

Comparative Example 6 The rayon short fibers 9 having a fineness of 2 denier
A laminated nonwoven fabric was produced in the same manner as in Example 1 except that a second short fiber web composed of 6% by weight and 4% by weight of polyethylene short fibers having a fineness of 2 denier (melting point: 133 ° C.) was used. .

With respect to the non-woven fabrics manufactured in Examples and Comparative Examples, the thickness, apparent specific gravity, thermal conductivity, tensile strength, softness and delamination were measured by the following test methods, and the results are shown in Table 1.
It was shown to.

Test method (1) Thickness Compression tester manufactured by Kato Tech Co., Ltd. (model: KES-F)
Using B3), 0.5 g for a non-woven fabric with a measurement area of 2 cm ^2.
/ Cm ² was applied and the thickness at that time was measured. (2) When the thickness measured by the apparent density (1) is Dmm and the basis weight of the nonwoven fabric having this thickness is Mg / m ² , M / (D × 1
000) was used as the apparent density. The unit is g / cm ³ . (3) Thermal conductivity Tester manufactured by Kato Tech Co., Ltd. (model: KES-F7)
Was measured using. The thermal conductivity is calculated by W × D / A × ΔT. However, W is the heat flow loss, D is the thickness of the nonwoven fabric, A is the area of the hot plate, and ΔT is the temperature difference of the nonwoven fabric. The unit of thermal conductivity is W (watt) / cm · ° C. The cold sensation refers to a feeling of warmth when the non-woven fabric is touched with a hand, and when the non-woven fabric absorbs body temperature quickly, that is, when the non-woven fabric has large heat conduction, it is said to be cold and inferior in the cold sensation. On the other hand, when the non-woven fabric hardly absorbs the body temperature, that is, when the thermal conductivity is small, it is said that it feels warm and is excellent in cold and warm feeling.

(4) Tensile Strength Using a Tensilon universal tensile tester (model: PTM-100) manufactured by Toyo Seimitsu Kogyo Co., Ltd., the tensile speed of the sample in the tester is 300 mm / min, the sample length is 80 mm, and the sample width is Was 100 mm, a tensile test was conducted, and the value of the breaking strength measured was multiplied by 3, and the tensile strength per 300 mm was shown. (5) Softness The softness was judged by a tactile test by 20 people. As for the test method, the non-woven fabrics of Examples and Comparative Examples were gripped with fingers to determine the softness, and the softness was evaluated at the following evaluation points, and the softness was shown by the average value of 20 people. Very soft: 5 points Soft: 4 points Slightly hard: 3 points Hard: 2 points (6) Delamination With a force that does not stretch the nonwoven fabric by hand from the place where there is no heat fusion point due to embossing in the cross section of the laminated nonwoven fabric. It was peeled off, and whether or not the layers could be peeled off was evaluated, and those that did not peel off were marked with a circle, and those that peeled off were marked with a cross.

[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, is excellent in bulkiness and cool and warm feeling, has no delamination, and has high strength and flexibility (implementation). Examples 1-5). On the other hand, a sheet made of spunbonded non-woven fabric alone has high apparent density and thermal conductivity,
Therefore, it is inferior in bulkiness, cold and warm feeling, and inferior in flexibility (Comparative Example 1). The laminated non-woven fabric obtained by combining two spun-bonded non-woven fabrics also has a slightly higher apparent density and thermal conductivity, and is inferior in bulkiness, cold and warm feeling and flexibility as compared with the laminated non-woven fabric of the present invention (Comparative Example 2). A non-woven fabric consisting of a short fiber web alone has low strength and excellent flexibility, but its bulkiness and cool and warm feeling are on the same level as those of the spunbond laminated non-woven fabric consisting of two sheets (Comparative Example 2) and are inferior (Comparative Example 3). . When the spunbonded nonwoven fabric has a large number of heat-sealed areas, the bulkiness is excellent, but the cold and warm feeling is slightly worse and the flexibility is poor (Comparative Example 4). When the total area of the third fusion bonding area is too low, the flexibility is excellent, the bulkiness and the cool and warm feeling are extremely excellent, but the strength is weak, and peeling occurs between the spunbond nonwoven fabric and the short fiber web. (Comparative example 5). Furthermore, even if there are too few short fibers that can be heat-sealed to the short fibers constituting the short fiber web, they are excellent in flexibility, and are extremely excellent in bulkiness and cool and warm feeling, but they are weak in strength and short in the short fiber web layer. Peeling occurs, which is not suitable for practical use (Comparative Example 6).

[0038]

As described above, the present invention comprising the first spunbonded non-woven fabric, the second short fiber web and the third spunbonded non-woven fabric, and a large amount of air between the short fibers constituting the short fiber web layer. In addition, since a large amount of air is also contained between the constituent fibers of the spunbonded nonwoven fabric, it is excellent in bulkiness and excellent in cool and warm feeling, and can be used for surface materials such as sanitary materials that come into direct contact with the skin of the body. It is effective to provide a laminated non-woven fabric having a three-layer structure that can be suitably used as a material and a method for producing the same.

[Brief description of drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st spunbonded nonwoven fabric 2 2nd short fiber web 3 3rd spunbonded nonwoven fabric 4 1st fusion bonding area 5 2nd fusion bonding area 6 3rd fusion bonding area

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B32B 5/02 A 7421-4F D04H 1/54 Q A61F 13/18

Claims (1)

[Claims] 1. A fiber having a fineness of 1 to 5 denier and having no fusion-bonding area before being laminated between layers of first and third spunbonded nonwoven fabrics having continuous filaments having a fineness of 1 to 5 denier. A laminated nonwoven fabric comprising three layers provided with a short fiber web, wherein the short fiber web contains at least 5% by weight of short fibers capable of being fused with the fibers constituting the spunbonded nonwoven fabric, and In the first and third spunbonded non-woven fabrics, long fibers constituting the spunbonded non-woven fabric are bonded by thermal self-fusion, and the total area of the entire fusion-bonded area is 4 to 10 of the area of the spunbonded non-woven fabric.
% Of the first and second fusing areas spaced apart from each other, and the laminated non-woven fabric composed of the three layers is partially fused by heat so that the total area of the entire fusing area is A laminated non-woven fabric, comprising a third fusion-bonded area comprising 2 to 6% of the area of the laminated non-woven fabric.