JPH05193037A - Permeable and waterproof sheet having stretching nerve - Google Patents

Abstract

PURPOSE:To improve physical properties, functionality and workability by basically forming a permeable and moistureproof sheet by a laminated nonwoven fabric, in which a melt blow ultra-thin fiber nonwoven fabric and a lint nonwoven fabric, in which means fiber diameters, weight per square meters, the apparent density of fibers, etc., are specified respectively, are heat-fused partially. CONSTITUTION:In an external wall ventilation technique, a ventilation layer 2 is interposed between an external wall 1 and a heat-insulating material 4. A house wrap 3 is interposed for preventing the deterioration of a heat-insulative effect. A moistureproof material 5 and an interior material 6 are disposed inside the heat- insulating material 4. The house wrap 3 is formed of a laminated nonwoven fabric, in which a melt blow ultra-thin fiber nonwoven fabric A having a mean fiber diameter of 5mum or less, weight per square meters of 15g/m<2> and the apparent density of 0.40g/cm<3> or less of fibers and a lint nonwoven fabric B having the means fiber diameter of 10mum or less and the weight per square meters of 20g/m<2> or more are heat-fused partially, at that time. A fiber sufficiency rate is brought to at least 60% and fibers are fused partially in a surface layer section from a surface on the nonwoven fabric B side to 40mum depth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breathable / waterproof sheet having elasticity.

More specifically, it is mainly used as a house wrap material or a roofing sheet material used for the purpose of functions such as moisture permeability, waterproofing, and heat insulation in the outer wall ventilation construction method of wooden houses, or for growing agricultural products and plants. The present invention relates to a breathable and waterproof sheet having a firm elasticity, which can be used in fields such as agricultural and horticultural sheet materials.

[0003]

2. Description of the Related Art Conventionally, in the construction of wooden houses or the like, a method of filling a heat insulating material between an interior material and an outer wall has been generally used for the purpose of blocking the outside air and keeping the indoor heat. There is.

In this case, however, water vapor generated in the room is cooled between the interior material and the outer wall, and water droplets that form dew corrode the heat insulating material and other interior materials and members, and also propagate germs and harmful insects. It has the harmful effects of promoting corrosion by promoting it and shortening the life of the building, especially in cold regions.

Recently, in order to improve these problems, FIG.
As shown in, a construction method generally called an outer wall ventilation construction method has been developed and implemented.

That is, in FIG. 1, the ventilation layer 2 is provided between the outer side of the heat insulating material layer 4 and the outer wall 1. In this case, the heat insulating material 4 such as glass wool has a large air permeability, and the cold air in the ventilation layer penetrates into the heat insulating material to significantly reduce the heat insulating effect. Therefore, the house wrap 3 may be provided to prevent this. It is generally done. Inside the heat insulating material 4 such as glass wool, a moistureproof material 5 such as a polyethylene film and an interior material 6 are provided.

As the functional characteristics required for such a house wrap 3, water vapor generated in the room is allowed to pass through the ventilation layer 2 and escaped to the outside, and the cool air in the ventilation layer 2 causes the heat insulating material layer 4 to pass.
Preventing invasion to the side, preventing water droplets from penetrating into the heat insulating material layer 4 (This function is also important especially during construction work where the outer wall is not stretched, since this windbreak material is the outermost side) In addition, it is desired that the workability is good and the cost is low.

[0008] As such a house wrap, conventionally,
Asphalt impregnated felt has been used.

A polyethylene nonwoven fabric obtained by the flash spinning method is commercially available, and is disclosed in JP-A-63-63.
JP-A-223249 proposes to use a laminate of a stretched polyolefin film and a polyolefin tape woven fabric at the site. Furthermore, the actual Kaihei 1-
Japanese Patent No. 658773 proposes to use a sheet obtained by subjecting a non-woven sheet using core-sheath fibers in which a resin having a low melting point and high hydrophobicity is arranged as a sheath component to a calendering treatment.

However, since the asphalt-impregnated felt has a low water vapor transmission rate (264 g / m ² · 24 hours in one example data), the above-mentioned problems occur and the outer wall ventilation construction method cannot solve the problems. It was In addition, it has a large basis weight and a heavy weight (420 g / m ² ), which makes it inconvenient to carry. In addition, since the state of the back side is completely invisible, the workability is inferior, for example, when the nail is struck on a crossbar with a nail. There was a defect.

The polyethylene non-woven fabric described above has no major drawbacks in terms of characteristics, but it is opaque and the back side cannot be seen at all, so the workability at the target position is poor, and the manufacturing method is difficult and the cost is high. There was also. In addition, the method proposed in Japanese Patent Laid-Open No. 223249/1988 has a problem in that the balance between moisture permeability and air permeability is difficult and the manufacturing method is difficult. Furthermore, the actual Kaihei 1-
The one proposed in Japanese Patent No. 658773 has a well-balanced moisture-permeation / water-proof property because it is inferior in water resistance and breathability when trying to obtain high moisture permeability and inferior in moisture permeability when trying to obtain high water resistance. No effective sheet material was obtained.

Further, in recent years, a bonding adhesive sheet of a melt-blown nonwoven fabric and a spunbonded nonwoven fabric has been proposed, and although it is excellent in function, it has a problem that it is too soft to hang down and is difficult to be constructed during on-site construction.

In addition, resin-processed non-woven fabrics and woven and knitted fabrics on the market have low water resistance and poor waterproofness if they have good moisture permeability, and also have poor windproof properties due to too good air permeability. The current situation is that a well-balanced house wrap has not been obtained.

[0014]

DISCLOSURE OF THE INVENTION The present inventors have fully considered the above-mentioned problems and have no such problems as described above.
With practical properties such as tensile strength, moisture permeability, waterproofness,
Since it has excellent functional properties such as windproof property and has an appropriate hardness considering workability, it is easy to hit with nails etc., it has excellent workability, and it is earnestly studied about a house wrap that can be manufactured at low cost. Finally, the present invention was finally reached.

[0015]

Means for Solving the Problems The elastic and moisture-permeable waterproof sheet of the present invention which achieves the above-mentioned object has a mean fiber diameter of 5 microns or less, a basis weight of 15 g / m ² or more, and an apparent fiber diameter of constituent fibers. Non-woven fabric (A) and non-woven fabric comprising a melt-blown ultrafine fiber non-woven fabric (A) having a density of 0.40 g / cm ³ or less and a long-fiber non-woven fabric (B) having an average fiber diameter of constituent fibers of 10 μm or more and a basis weight of 20 g / m ² or more. (B) is composed of a laminated non-woven fabric that is bonded and integrated by partial heat fusion bonding, and the fiber filling rate is at least 60% in the surface layer portion from the surface on the non-woven fabric (B) side to a depth of 40 microns. It is a moisture-permeable and waterproof sheet having elasticity, which is characterized in that the fibers are fused at least partially.

In the elastic and moisture-permeable waterproof sheet of the present invention, the laminated nonwoven fabric preferably has a moisture permeability of at least 4000 (g / m ² · 24 hours) and a water resistance of at least 600 (mm water column). It is characterized by being.

Further preferably, the constituent fiber components of the non-woven fabric (A) and / or the non-woven fabric (B) are
It is characterized by being a polyolefin resin or a copolymer thereof.

Alternatively, the constituent fiber component of the nonwoven fabric (A) and / or the nonwoven fabric (B) is a polypropylene resin or a copolymer thereof.

Alternatively, the constituent fiber of the non-woven fabric (B) is a core-sheath type composite fiber having a fiber forming component as a core component and an adhesive component as a sheath component. Alternatively, at least the constituent fibers of the non-woven fabric (A) and / or the constituent fibers of the non-woven fabric (B) contain an ultraviolet absorber.

Alternatively, it is characterized by being further treated with a water repellent agent.

Alternatively, the present invention is a house wrap material using a moisture-permeable and waterproof sheet having elasticity.

Alternatively, the present invention is an agricultural / horticultural sheet using a breathable and waterproof sheet having elasticity.

[0023]

The function of the elastic and moisture-permeable / waterproof sheet of the present invention will be described in more detail below.

First, in the present invention, as a method for measuring the above-mentioned fiber filling rate, as shown in FIGS.
A 500 times cross-section photograph of a surface layer portion from the surface to a depth of 40 microns in the range excluding the heat-melt adhesive portion of the long fiber non-woven fabric (B) was taken with a scanning electron microscope.
The 00 micron width (200 micron width x 10 locations) was binarized to clarify the fiber portion and the void portion using an image processing device, and the area ratio obtained by calculating the fiber occupation area ratio was used as the fiber filling ratio. It is what In the present invention, the measurement points are randomly sampled, the number of n is set to 10, and the average value thereof is obtained.

2A and 2B are exploded views showing a method for measuring the fiber filling rate, and FIG. 2A is a 500-fold crossing type electron on the long fiber nonwoven fabric (B) side. FIG. 2B is a copy of an example of a microscopic cross-sectional photograph, and FIG. 2B shows an example of binarization processing from the surface of a to a depth of 40 microns using an image processing device. ..

First, moisture permeability, waterproofness, windproofness, etc. are greatly influenced mainly by factors such as void area between fibers constituting a sheet, void number density, thickness and contact angle with water. Among these factors, the water resistance is improved by decreasing the void area between fibers and the contact angle with water, and the void area between fibers and the void number density are reduced, and the air permeability is decreased by increasing the thickness. On the other hand, it is important to balance these basic factors well, since the larger the void area and void number density, and the smaller the thickness, the greater the water vapor transmission rate. It is greatly related to the size of.

That is, for functional characteristics such as moisture permeability, waterproofness, and windproofness, it is important to use a melt blown ultrafine fiber nonwoven fabric having an average fiber diameter of 5 μm or less and a basis weight of 15 g / m ² or more. Average fiber diameter is 5
If it is larger than micron, or the basis weight is 15g / m ²
If it is smaller than the above range, desired properties such as moisture permeability, waterproofness, windproof property, etc., in the present invention cannot be obtained. Even such a melt-blown ultrafine fiber non-woven fabric is particularly preferable in the case of 4 micron or less because moisture permeability is hardly impaired and the water resistance is large and the waterproof property is excellent. In this case, it is also preferable because the air permeability is reduced and the windproof property is improved. Furthermore, when the average fiber diameter is 3 microns or less, waterproofness and windproof property are improved while maintaining practical moisture permeability, and therefore it is more preferably used. If such a melt-blown ultrafine fiber nonwoven fabric has a too low basis weight, it has excellent moisture permeability but poor water resistance due to low water resistance, and has too high air permeability resulting in poor windproof property. 1 to achieve the
It is important to be 5 g / m ² or more. Especially 20g
A value of more than / m ² is more preferable because the above functional characteristics can be stably obtained. On the other hand, the upper limit of the areal weight is not particularly limited, but if it is too large, the waterproofness and windproof property are excellent, but the moisture permeability gradually decreases, and it becomes heavy and poor in workability, and the cost becomes high. Therefore, it is preferable to have a unit weight of as small as possible, and a unit weight of 200 g / m ² or less is preferably used in consideration of obtaining stable functional characteristics.

The melt-blown ultrafine fiber nonwoven fabric used in the present invention has a basic process for producing it, in which a heated high-speed gas body is sprayed onto a fine stream of a molten polymer, and the molten polymer is stretched by the action of the gas stream to obtain an ultrafine fiber. Any method may be used as long as it is formed by a melt-blowing method in which it is made into fibers and collected into a sheet, and the details thereof are not particularly limited.

The resin forming the constituent fibers of the melt-blown ultrafine fiber nonwoven fabric used in the present invention includes polyolefins such as polypropylene and polyethylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon 6 and nylon 66, and these. Copolymers, polyvinyl chloride, acrylic and acrylic copolymers, polystyrene, polysulfone, polytrifluorochloroethylene, polycarbonate, polyurethane and the like. Among these, although not particularly limited, polyolefins such as polypropylene and polyethylene are preferable because of their spinnability and water repellency, especially because they have a small contact angle with water, and among them polypropylene is particularly preferable because of the ease of melt blow spinning. ..

The elastic and moisture-permeable waterproof sheet of the present invention may vary depending on the purpose, but it is required to have physical properties such as tensile strength and appropriate hardness from the practical aspects such as workability. However, the melt-blown ultrafine fiber non-woven fabric alone has low tenacity properties and is flexible because the fibers are thin, and it is generally impossible to achieve appropriate hardness and the like. Therefore, the melt-blown non-woven fabric (A) has an average fiber diameter of constituent fibers. It is essential that the long fiber nonwoven fabric (B) having a basis weight of 10 μm or more and a basis weight of 20 g / m ² or more is partially heat-melt-bonded to obtain a laminated and integrated sheet to obtain practical physical properties. Here, the heat fusion bonding means joining by a thermal action, and means joining such as fusion by heat, softening joining, and soft joining.

The nonwoven fabric (B) has an average fiber diameter of 1
If it is 0 micron or more, if it is less than 100 microns, and if the basis weight is less than 20 g / m ² , it is difficult to impart the above-mentioned strength characteristics and appropriate hardness. The non-woven fabric (B) was made by cutting filaments made of ordinary fibers into short fibers, and the non-woven fabric obtained through web forming and needle punching, and the basic process fell to a temperature at which fiberization from the nozzle was possible. The molten polymer may be drawn by suction with a high-speed suction gas, then opened using a fiber-opening device, and may be a nonwoven fabric obtained by a spunbond method in which a sheet is collided and collected into a conveyor-like net,
Although not particularly limited, a nonwoven fabric produced by the spunbond method is preferable because it is easy to obtain stable strength properties, and the production method is simple and the production cost is low.
Further, the nonwoven fabric obtained by the spunbond method may be a core-sheath type composite fiber having a fiber-forming component as a core component and an adhesive component as a sheath component. As the resin forming the constituent fibers of the non-woven fabric by the spun bond method, polyethylene, polyolefin such as polypropylene, polyethylene terephthalate, polyester such as polybutylene terephthalate,
Examples thereof include polyamides such as nylon 6 and nylon 66, or copolymers thereof, polyvinyl chloride, acrylic or acrylic copolymers, polystyrene, polysulfone, polytrifluorochloroethylene, polycarbonate, polyurethane and the like. In the present invention, although not particularly limited, polyolefins such as polypropylene and polyethylene are preferable from the viewpoint of spinning stability, water repellency, low cost, and the like. From the viewpoint of ease, polypropylene is particularly preferable, and also in the case of the core-sheath type composite fiber, the above resin is used as the heat-adhesive component (sheath), and the fiber-forming component (core) is used.
As the polyester, polyesters such as polyethylene terephthalate and polybutylene terephthalate, and copolymers thereof are preferably used.

In the present invention, the nonwoven fabrics (A) and (B)
Is adhered and integrated by partial heat fusion bonding, but since it is adhered and integrated by such partial heat fusion adhesion, the moisture permeability mainly achieved in the nonwoven fabric (A), Functional properties such as waterproof property and windproof property can be well retained as a laminated sheet.

Various methods can be adopted as the method for obtaining the moisture-permeable / water-proof sheet integrally bonded / joined by partial heat fusion, and are not particularly limited. By simply laminating the previously prepared nonwoven fabric (A) and another previously prepared nonwoven fabric (B), or by spraying meltblown ultrafine fibers onto the previously prepared nonwoven fabric (B) to form the nonwoven fabric (A). It is sufficient that the laminate is laminated and the obtained laminate is partially heat-adhered, and any means such as heat embossing, ultrasonic wave, or high frequency can be used, but it is not particularly limited, but cost advantage From the standpoint of practicality and practicality, the hot embossing method having an uneven pattern is preferably used.

In the heat-bonding process, it is important to take care not to make the heat-bonded portion extremely thin or to make a hole during the process.

Here, the elastic and moisture-permeable waterproof sheet of the present invention has an appropriate hardness for improving workability in the surface layer portion from the surface of the nonwoven fabric (B) side to a depth of 40 microns. A fiber fill factor of at least 60%, and
This can be achieved by fusion bonding between fibers at least partially. It is important that the fiber filling rate is at least 60%, and when the fiber filling rate exceeds 80%, the fibers are formed into a film, and the fiber filling rate becomes more preferable. In addition, "the fiber filling rate is at least 6 in the surface layer portion from the surface of the non-woven fabric (B) side to a depth of 40 microns.
"0%" means that when the non-woven fabric (B) has a thickness of 40 microns or less (which is a rare case in general), "the fiber filling ratio of the whole non-woven fabric (B) is at least 60%". It means that.

The laminated nonwoven fabric has a moisture vapor transmission rate of at least 400.
0 (g / m ² · 24 hours), water resistance of at least 600
(Mm water column) is preferable because the moisture permeation / waterproof effect can be exhibited well.

The method for obtaining the elastic and moisture permeable and waterproof sheet of the present invention is not particularly limited as long as it can be constituted so as to satisfy the above-mentioned physical characteristics. , For example, non-woven fabric (B) of laminated non-woven fabric
The non-woven fabric (B) and the non-woven fabric (A), which have been heat-pressed so that only the surface on the side is heated, or have been hot-pressed so that only the surface is heated, are bonded and integrated by partial heat fusion bonding. It can be achieved by doing. The processing conditions such as the roll temperature, the press pressure, the processing speed and the processing clearance at this time are not particularly limited as long as the above requirements are satisfied. Here, hot pressing may be performed so that the surface on the nonwoven fabric (A) side is heated as long as the above requirements are satisfied, but if the roll temperature is high, the water resistance may be poor.

In the present invention, at least the nonwoven fabric (A)
Incorporation of the ultraviolet absorbent into the constituent fibers of (1) and / or the constituent fibers of the non-woven fabric (B) is a preferable means because it is possible to stably improve the durability, particularly the light resistance. The amount of the ultraviolet absorber added varies depending on the type of the ultraviolet absorber and the degree of improvement in light resistance, and may be added in an appropriate amount within the range that does not impair the effects of the present invention.
Further, addition of an antioxidant such as a radical chain inhibitor or a peroxide decomposing agent together with the ultraviolet absorber is also a means that can be appropriately taken if desired.

If the sheet of the present invention is treated with a water repellent agent, the water resistance can be efficiently improved, so that the sheet can be positively used.

[0040]

As described above, according to the present invention, it has practical physical properties such as tensile strength, is excellent in functional characteristics such as moisture permeability, waterproofness and windproof property, and has an appropriate hardness. Since it is easy to construct and inexpensive, if used as a dew condensation-proof windproof sheet in a residential building, the functional characteristics of the sheet, such as moisture permeability, waterproofness, and windproofness, are good, so that no external wall is constructed. It not only prevents rainwater from entering, but also has excellent heat retention and dew condensation prevention properties after moving in, providing a comfortable feeling of living and significantly improving the service life of the building.

Further, since the back surface of the sheet can be seen through, the sheet does not fail when it is nailed to a crossbar or the like, and is about 5 to 6 compared to the conventionally used asphalt-impregnated felt or paper. Since it is twice as lightweight, the workability during carrying and construction is remarkably improved, so that it is possible to provide a building material sheet suitable as a dew condensation preventing windproof sheet in the outer wall ventilation method.

Further, since it has excellent breathability and moisture permeability, it can be used as an agricultural material. For example, if it is used as a liner curtain for a greenhouse, the effect of preventing disease of crops due to condensation of water drops at night can be exhibited.

The elastic and moisture-permeable waterproof sheet of the present invention has various advantages such as various filters, wipers, wrap materials, disposable diapers and sanitary products because of the excellent features of the melt blown ultrafine fiber nonwoven fabric constituting the sheet. It can be applied to a wide range of applications such as covering sheets and medical applications.

[0044]

EXAMPLES The following examples are for clarifying the present invention, and the present invention is not limited thereto.

The physical properties in the examples were measured by the following methods.

(1) Water vapor transmission rate: JIS-Z-0208 (40
(° C-90% RH) (2) Water resistance: JIS-L-1092A method (3) Air permeability: JIS-L-1096 (Flagille method) (4) Tensile strength: JIS-L-1096 (5) Bending resistance : JIS-L-1079 (45 ° cantilever method, but the measured value with the non-woven fabric (B) side as the surface) (6) Average fiber diameter: 1000 times (scanning electron microscope) enlarged photograph, 300 or more The fiber diameter was read and used as the average value.

Comparative Examples 1 and 2 Melt Flow Index (Load 2.16 kg, 230
℃) 60g / 10min polypropylene (melting point 157.6
(° C.) by a melt blow spinning method to obtain a melt blown ultrafine fiber nonwoven fabric (A) having an average fiber diameter of 1.5 μm and a basis weight of 30 g / m ² .

Next, the non-woven fabric (A) is used as the upper layer, and the basis weight is 30 g.
/ M ² (Comparative Example 1) and a basis weight of 50 g / m ² (Comparative Example 2) made of polypropylene spunbonded nonwoven fabric (B) (manufactured by Nippon Nonwoven Fabric Co., Ltd., average fiber diameter 27 microns) as a lower layer, While sandwiching between the rugged surface roll of ℃ (upper roll) and the plain roll of 140 ℃ (lower roll),
A heat-bonding sheet was obtained at a pressure of 80 Kg / cm. In addition, Table 1 shows the measurement results of the fiber sufficiency ratio in the surface layer portion from the surface on the nonwoven fabric (B) side of these sheets to a depth of 40 microns.
Other processing results are shown in Table 2.

[0049]

[Table 1]

[Table 2] Examples 1 and 2 The nonwoven fabric (B) side of the thermal adhesive sheets obtained in Comparative Examples 1 and 2 is 1
While using an iron plain roll (upper roll) at 25 ° C. and sandwiching it so that the nonwoven fabric (A) side is a rubber roll at room temperature,
Nip pressure is 30 kg / cm, clearance is 0 m
Processing was performed under the conditions of m and roll speed of 5 m / min. Most of the surface layer on the nonwoven fabric (B) side of this sheet was fused between fibers. In addition, Table 1 shows the measurement results of the fiber filling rate in the surface layer portion having a depth of 40 microns from the surface of the nonwoven fabric (B) side of these sheets, and Table 2 shows the other processing results.

Example 3 The non-woven fabric (A) side of the thermal adhesive sheet obtained in Comparative Example 1 was 125.
℃ iron plain roll (upper roll), non-woven fabric (B)
The nip pressure was 30 Kg / cm, the clearance was 0 mm, and the roll speed was 5 m / min while sandwiching the rubber roll so that the side was a normal temperature rubber roll. In most of the surface layer on the nonwoven fabric (A) side of this sheet, the fibers were fused. The processing results are shown in Table 2.

As can be seen from Tables 1 and 2, the products of the present invention (Examples 1, 2, and 3) have comparative fiber filling rates in the surface layer portion from the surface on the nonwoven fabric (B) side to a depth of 40 microns. It is much higher than the 1st and 2nd products, and has moderate rigidity as indicated by the bending resistance value, so there is no morphological instability during construction, and further moisture permeability, water resistance, windproofness, etc. Was excellent, and was excellent as a breathable and waterproof sheet with firm elasticity. The water resistance of Example 3 was as small as 510 (mm water column) and the rigidity was inferior to that of Examples 1 and 2, but the water vapor transmission rate was good and satisfactory as a whole. ..

Example 4 A fluorine-based water repellent (“Fineguard”, manufactured by Sanwa Kasei Co., Ltd.) was added to the sheet prepared in Example 1, and the sheet was treated with hot air at 80 ° C. for 10 minutes to make it water repellent. As a result of evaluation, it was improved to 90 points before the treatment and 100 points after the treatment. In addition, the water resistance from the 1200 mm water column before treatment to 1350 after treatment
It has been improved to a water column of mm, and it was excellent as a breathable and waterproof sheet with firm elasticity.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of a general outer wall ventilation method.

2 (a) and 2 (b) are exploded views showing a method for measuring a fiber filling rate, and FIG. 2 (a) is a 500-fold cross-type electron on the long fiber nonwoven fabric (B) side. FIG. 2B is a copy of an example of a microscopic cross-section photograph, and FIG. 2B shows an example of binarization from the surface of FIG. 2A to a depth of 40 microns using an image processing device. Is.

[Explanation of symbols]

 1: Outer wall material 2: Ventilation layer 3: Windproof material according to the present invention 4: Heat insulating material (glass wool etc.) 5: Moistureproof material (polyethylene film etc.) 6: Interior material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display part D06N 7/04 7141-4F E04B 1/70 A

Claims (9)

[Claims] 1. An average fiber diameter of constituent fibers of 5 microns or less, a basis weight of 15 g / m ² or more, and an apparent density of fibers of 0.40 g / c.
Melt blown ultrafine fiber non-woven fabric (A) with m ³ or less, average fiber diameter of constituent fibers of 10 μm or more, and basis weight of 20 g / m ²
The long fiber non-woven fabric (B) described above is a laminated non-woven fabric in which the non-woven fabric (A) and the non-woven fabric (B) are bonded and integrated by partial heat fusion bonding, and is deep from the surface on the non-woven fabric (B) side. A moisture-permeable and waterproof sheet having elasticity, which has a fiber filling rate of at least 60% in the surface layer portion of up to 40 microns and is formed by fusion bonding between fibers at least partially. 2. The moisture permeability of the laminated nonwoven fabric is at least 4000.
(G / m ² · 24 hours), water resistance of at least 600
The water vapor transmission / waterproof sheet according to claim 1, which is (mm water column). 3. Nonwoven fabric (A) and / or nonwoven fabric (B)
The elastic and moisture-permeable waterproof sheet according to claim 1 or 2, wherein the constituent fiber component of (1) is a polyolefin resin or a copolymer thereof. 4. Nonwoven fabric (A) and / or nonwoven fabric (B)
4. The stretchable moisture-permeable / waterproof sheet according to claim 1, 2 or 3, wherein the constituent fiber component is a polypropylene resin or a copolymer thereof. 5. The non-woven fabric (B), wherein the constituent fibers are core-sheath type composite fibers having a fiber-forming component as a core component and an adhesive component as a sheath component. A breathable and waterproof sheet with the described elasticity. 6. The ultraviolet absorbent is contained in at least the constituent fibers of the non-woven fabric (A) and / or the constituent fibers of the non-woven fabric (B). A breathable and waterproof sheet with a firm elasticity. 7. The stretchable, moisture-permeable and waterproof sheet according to claim 1, 2, 3, 4, 5, or 6, which is treated with a water repellent agent. 8. A house wrap material using the moisture-permeable and waterproof sheet having elasticity according to claim 1, 2, 3, 4, 5, 6 or 7. 9. An agricultural / horticultural sheet using the elastic and moisture-permeable / waterproof sheet according to claim 1, 2, 3, 4, 5, 6 or 7.