JPH0542638A - Manufacture of water proof permeable composite sheet - Google Patents

Abstract

PURPOSE:To obtain the title sheet which has a soft touch and besides, is excellent in permeability and water proofness by a method wherein a woven fabric or a nonwoven fabric is fixed by hot pressure to a film consisting of a specific elastomer composition by dividing the process into. at least, two ones in which rise in temperature becomes a specific value or lower. CONSTITUTION:A film 11 is formed by an air cooling inflation technique with a composition composed of 30-70wt.% of ethylene-propylene-diene-copolymer rubber and 70-30wt.% of ethylene-vinyl acetate copolymer of 0.2-25g/10min in melt index. Then, after the film 11 and a woven fabric or a nonwoven fabric 12 are preheated by a preheating process with preheating rolls 12-16, they are thermally shrunk by passing through hot pressure fixing rolls 17-20 to make many micropores in the film 11. At that time, 100-180 deg.C as temperature at the initial stage, 100-195 deg.C as temperature at the last stage, about 0-15 deg.C or less as rise in temperature from the first stage to the last stage, etc., are set, and the pore diameter of the film 11 is appropriately controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a waterproof and moisture-permeable composite sheet, and more particularly to a film and a woven fabric comprising an ethylene-propylene-diene copolymer rubber and an ethylene-vinyl acetate copolymer. The present invention relates to a method for producing a composite sheet having a waterproof property and a moisture permeability, which is formed by hot pressing a cloth or a non-woven fabric.

[0002]

2. Description of the Related Art A sheet or film having waterproofness and moisture permeability has been widely used in recent years as a leakproof sheet for disposable diapers and the like.

Such a moisture permeable film is generally produced by filling a large amount of an inorganic filler in a polyolefin resin, melt-kneading the mixture to form a film, and uniaxially or biaxially stretching it to make it porous. Has been done. In such a moisture-permeable film, stretching causes fine breakage starting from the inorganic filler, thereby forming pores with a pore size of about 1 to 4 μm.

However, due to the rigidity peculiar to the stretched film, such a moisture permeable film has a problem that it feels like crisp paper and is not suitable for applications requiring a soft feeling. There is also a problem that the tensile strength and tear strength are not sufficient.

A method for producing a flexible porous film by adding a low melting point polymer, a rubber-like polymer, an olefinic thermoplastic elastomer and the like of the same type to a polyolefin resin together with an inorganic filler has also been proposed. Was not sufficient, and the film strength was poor.

Therefore, various proposals have been made to impart flexibility to a stretched moisture-permeable film composed of a polyolefin resin and an inorganic filler (Japanese Patent Laid-Open Nos. 60-257221 and 62-27438, Japanese Patent Publication No. 63-35721).

However, since any of the above moisture-permeable films is obtained by stretching, it is thin and has poor mechanical strength, and it is often necessary to use it by laminating it with another material. For this reason, secondary processing is required, and there is a drawback that the price becomes high.

[0008] Therefore, the present inventor hot-pressed a stretched film of a composition comprising a crystalline polyolefin, a rubbery polymer and a filler to a mesh sheet at a temperature not lower than the heat shrinkage initiation temperature of the stretched film. By fixing the stretched film and heat-shrinking it, and by micronizing the stretched film, it was discovered that it is possible to obtain a moisture-permeable composite film having a soft texture and large mechanical strength. We filed a prior application for a method of manufacturing a moisture-permeable composite film (Japanese Patent Application Laid-Open No. Hei 10 (1999) -242242)
1-201340). Further, for the purpose of imparting a softer feeling to the composite sheet, a stretched film of the olefinic elastomer composition is hot-pressed to the mesh-like sheet at a temperature of the heat shrinkage initiation temperature of the stretched film or higher, A method for producing a composite film in which the stretched film is fixed and heat-shrinked so that the stretched film is microporous, was previously filed (Japanese Patent Laid-Open No. 2-80).
No. 231).

The moisture-permeable composite film has an excellent soft feeling and also has excellent mechanical strength and moisture permeability. However, recently, in diapers, sportswear and the like, materials having better waterproofness, moisture permeability and soft feeling have been demanded. Further, it has been found that it is desirable that the balance between waterproofness and moisture permeability is slightly different depending on the application. for that purpose,
The distribution of micropore diameters of the composite sheet needs to be uniform within a specific range. Therefore, as a result of various studies on the pore size of the above composite sheet, the present inventors may expand the micropores once formed depending on the heating conditions at the time of hot press bonding, and then the moisture permeability is significantly increased. I found out that there is. If this point is utilized, it is possible to adjust the pore size to some extent, and it is possible to obtain a composite sheet that has waterproof and stable moisture permeability, and yet has a soft touch, and is extremely useful as a functional material. Can be something.

Therefore, it is an object of the present invention to provide a method for producing a composite sheet having an excellent soft feeling and good moisture permeability and waterproofness.

[0011]

As a result of earnest research in view of the above objects, the present inventors have found that when a woven fabric or a non-woven fabric is hot-press bonded to a film made of a specific elastomer composition,
If the hot press bonding is performed in at least two steps and the temperature from the first step to the final step is isothermal or a temperature rise below a specific temperature, the microporosity formed by the first hot press bonding is used as a base point. The inventors have found that the pore diameter can be slightly increased, and the pore diameter of the micropores can be adjusted to some extent depending on the degree of temperature rise, and the present invention has been made.

That is, the method for producing a waterproof and moisture-permeable composite sheet according to the present invention comprises (A) (a) 30 to 70% by weight of ethylene-propylene-diene copolymer rubber, and (b) a vinyl acetate content of 5 to 5. A film is formed by an air-cooled inflation method from a composition consisting of 70 to 30% by weight of an ethylene-vinyl acetate copolymer having a melt index of 30% by weight and a melt index of 0.2 to 25 g / 10 min, and (B) the film and a woven fabric. Alternatively, a non-woven fabric is hot-pressed to fix the film to the woven or non-woven fabric and heat-shrink, thereby making the film microporous, and the hot-pressing is a preheating step and at least two steps of heating. The temperature of the first stage of the thermocompression bonding process is 100 to 180 ° C, the temperature of the last stage is 100 to 195 ° C, and the temperature rise from the first stage to the last stage is almost the same. 0 to + 15 ℃ or less It is characterized in.

The present invention is described in detail below. In the method of the present invention, the (a) ethylene-propylene-diene copolymer rubber (EPDM) is a copolymer containing ethylene, propylene and a diene compound. Examples of the diene compound include ethylidene norbornene, 1,4-hexadiene, and dicyclopentadiene.

The ethylene-propylene-diene copolymer rubber (EPDM) has an ethylene content of 60 to 70 mol%,
It is preferable that the propylene content is 30 to 40 mol% and the diene compound content is 1 to 10 mol%. A more preferable range is 62 to 66 mol% of ethylene, 33 to 37 mol% of propylene, and 3 to 6 mol% of diene compound. The number average molecular weight is preferably 400,000 to 600,000.

Further, the melt index (190 ° C., 2.
A copolymer having a load (16 kg) of 0.1 to 5.0 g / 10 min is preferable, more preferably 0.30 to 1.0 g / 10 min, and still more preferably 0.35 to 0.50 g / 10 min. It is a polymer.

The ethylene-propylene-diene copolymer rubber (EPDM) is basically composed of the above-mentioned units, but within a range that does not impair the characteristics of these copolymers, for example, butene-1 or 4 -Other units such as α-olefins such as methylpentene-1 may be included.

The ethylene-vinyl acetate copolymer (EVA) used in the present invention has a vinyl acetate content of 5 to 30% by weight.
Is a copolymer of. Particularly in the present invention, it is preferable to use an ethylene-vinyl acetate copolymer having a vinyl acetate content within the range of 15 to 30% by weight. Also ethylene
Vinyl acetate copolymer (EVA) has a number average molecular weight of 12,000 to 14
Those in the range of 000 are preferred. The melt index (190 ° C., 2.16 kg load) of such a copolymer is usually 0.2 to 25 g / 10 minutes, preferably 15 to 25 g / 10 minutes.

The mixing ratio of the above-mentioned (a) ethylene-propylene-diene copolymer rubber (EPDM) and (b) ethylene-vinyl acetate copolymer (EVA) is such that the ethylene-propylene-diene copolymer The combined rubber is 30 to 70% by weight, preferably 50 to 60% by weight, and the ethylene-vinyl acetate copolymer is 70 to 30% by weight, preferably 40 to 60% by weight. When the ethylene-propylene-diene copolymer rubber is less than 30% by weight (when the ethylene-vinyl acetate copolymer exceeds 70% by weight), the elasticity of the obtained film is lowered, and the ethylene-propylene-diene copolymer weight is also reduced. When the amount of the compounded rubber exceeds 70% by weight (when the ethylene-vinyl acetate copolymer is less than 30% by weight), the moldability and softness of the obtained film deteriorate.

Further, in the present invention, in addition to the above resin components, an antioxidant, an ultraviolet absorber, an antistatic agent, a coloring agent and the like can be appropriately blended. However, in the present invention, the addition of the inorganic filler makes it difficult to form a thin film, so it is preferable not to add it.

Next, a method for manufacturing the waterproof and moisture-permeable composite sheet of the present invention will be described. The above-mentioned components of ethylene-propylene-diene copolymer rubber (EPDM) and ethylene-vinyl acetate copolymer (EVA) are kneaded. The kneading is preferably carried out at a resin temperature of about 150 to 175 ° C.

After kneading, it is formed into a film.
The thickness of the film is preferably 10-40 μm,
If it is thinner than m, the film strength will be reduced, and if it is thicker than 40 μm, it becomes difficult to form fine through holes for imparting moisture permeability. Film is formed by inflation molding method (air cooling method) 1
It is preferable that the blow ratio (bubbling diameter / die slit diameter) is in the range of 2.0 to 5.0 at a resin temperature of 20 to 165 ° C. The resulting film thickness is
It becomes 10-40 μm.

As the woven or non-woven fabric used in the present invention, various woven fabrics such as gauze and other plain woven fabrics and non-woven fabrics produced by the spunbond method, melt blow method or the like can be used. The non-woven fabric does not have to be made of long fibers, but may be made of short fibers that are entangled or spot-welded. It is necessary that the woven or non-woven fabric is not substantially melted or thermally shrunk in the hot pressing step described below. Therefore, it is generally necessary that the woven or non-woven fabric has a melting point or a second-order transition point higher than that of the film by at least 20 ° C. or more.

In the method of the present invention, the hot press bonding of the film and the woven or non-woven fabric includes a preheating step and at least two steps.
It is carried out by a thermocompression bonding process in stages. The temperature of the preheating step is 70 to 100 ° C, preferably 90 to 100 ° C. Also, the thermocompression bonding process has at least two stages, but the temperature of the first stage is
100 to 180 ° C, preferably 110 to 140 ° C, the temperature of the last stage is 100 to 195 ° C, preferably 110 to 155 ° C, and the temperature rise from the first stage to the last stage is almost 0 to +
Must be below 15 ° C. If the temperature is out of the above range, the adhesion between the film and the woven or non-woven fabric and the heat shrinkage of the film are not sufficient, or the waterproof property is deteriorated. Further, when the pressure-bonding temperature from the first stage to the last stage is lowered, the micropores formed have the same pore diameter (30 μm or less) and the moisture permeability is impaired. Also, if the pressure bonding temperature from the first stage to the last stage exceeds 15 ° C, the pore size greatly expands and the moisture permeability is improved, but the waterproof property is reduced.

Particularly, it is preferable that the thermocompression bonding is performed in two steps. In this case, the temperature of the first stage may be 100 to 180 ° C., the temperature of the second stage may be 100 to 195 ° C., and the temperature difference between the thermocompression bonding process of the first stage and the second stage may be within the above range.

In the case where the hot-pressing step comprises three or more steps, the temperature rise from the first step to the last step should be approximately 0 to 15 ° C. or less.

When a composite sheet is manufactured from the same material, the larger the temperature difference, the larger the microporous hole diameter, and the smaller the isothermal temperature tends to be. Therefore, depending on the elastomer film and the thickness of the woven or non-woven fabric,
By appropriately setting the temperature difference in the thermocompression bonding step, a microporous membrane having a desired average pore diameter can be obtained. For this reason, applications where waterproofness is rather important,
Alternatively, the balance between waterproofness and moisture permeability can be adjusted depending on the use, such as the use where moisture permeability is important.

Further, the thermocompression bonding is performed in the first step.
Preference is given to working at a pressure of -10 kg / cm ² . 0.1 kg / cm ²
If it is less than 10%, the adhesion of the film is not sufficient, and if it exceeds 10 kg / cm ² , the film strength decreases. More preferable pressure conditions
It is 0.5 to 5 kg / cm ² . The second step and the subsequent steps may be 0.1 to 3 kg / cm ² .

Hot pressing of the film and the woven or non-woven fabric is preferably performed by a heat roll, as will be described in detail later. At that time, in addition to pressing the film and the woven or non-woven fabric one by one, the woven or non-woven fabric may be sandwiched between two films, or conversely, the film may be sandwiched between two woven or non-woven fabrics. You can also

In the composite sheet thus obtained, the film is microporous due to heat shrinkage due to hot pressure bonding. The fine pores of the film are slightly different depending on the hot press bonding conditions, but generally have a pore size of 50 to 300 μm, so that they have excellent moisture permeability and waterproofness.

[0030]

In the manufacturing method of the present invention, the hot-pressing step is composed of a plurality of steps, and the temperature rise from the first step to the last step is + 15 ° C. or less. Therefore, the micropores formed during the first thermocompression bonding are fixed without being significantly shrunk.

Although the reason why such an effect is obtained is not always clear, normally, when thermocompression bonding is performed in multiple stages, the microscopic holes formed by the first thermocompression bonding have thermal energy that accompanies subsequent thermocompression bonding. However, if the temperature conditions of the present invention are used, the expansion of the pores can be suppressed to a minimum, and it becomes possible to control to a desired pore diameter (around 100 μm). ..

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view showing an example of an apparatus suitable for carrying out the hot press bonding of the present invention. This hot pressing apparatus heats the film 11 and the woven or non-woven fabric 12 with the first pre-heating rolls 13 and 14 and the second pre-heating rolls 15 and 16 for pre-heating the film 11 and the woven or non-woven fabric 12. First hot pressing rolls 17 and 18 for press bonding, and second hot pressing rolls 19 for hot pressing again the composite sheet after the first hot pressing,
It has 20 and a winding roll 21. In addition, roll 14,
16, 18, 20 are elastic rolls.

The temperatures of the preheating rolls and the hot pressing rolls are as follows. 1st preheating roll ··· 70 ~ 100 ℃ 2nd preheating roll ··· 70 ~ 100 ℃ 1st hot press roll · · 100 ~ 180 ℃ (preferably 10
0 ~ 150 ℃) 2nd hot pressure bonding roll ... 100 ~ 195 ℃ (preferably 10
(0 to 165 ° C)

The temperature of the preheating roll 13 varies depending on the type and thickness of the woven or non-woven fabric used, but is preferably about 100 ° C. In this embodiment, the preheating is performed by using two stages of rolls, but one stage or two or more stages may be used. The gap between the first hot press rolls 17 and 18 and the gap between the second hot press rolls 19 and 20 can be appropriately adjusted so as to apply a desired press pressure.

When the elastomer film is present on one side as in this embodiment, each elastic roll 14,
It is preferable that 16, 18, and 20 have excellent releasability, and it is preferable to use rolls of silicone rubber, Teflon rubber, or the like. Further, the elastic roll is preferably cooled to 60 ° C. or lower with cooling water. If the roll temperature exceeds 60 ° C, the elastomer film is likely to adhere to the roll, and the efficiency decreases.

When the elastomer film is sandwiched between two woven or non-woven fabrics, a woven or non-woven fabric 12 may be further supplied from below the elastomer film 11 in the apparatus shown in FIG. Good.

The present invention will be described in more detail with reference to the following specific examples. Example 1 Ethylene-Prompylene-Diene Copolymer Rubber (EPDM,
Vistalon 3708, manufactured by Exxon Chemical Co., Ltd., 60% by weight,
A composition comprising 40% by weight of an ethylene-vinyl acetate copolymer (EVA, DQDJ-3269, manufactured by Nippon Unicar Co., Ltd.) was melt-kneaded by an extruder, and a film was formed by the air-cooled inflation method under the following conditions.

Die diameter: 150 mm Temperature: 145 to 165 ° C Extrusion: 60 to 80 kg / hour Pulling speed: 20 to 25 m / min

The obtained elastomer composition film had a thickness of about 25 μm and a blow ratio of 3.0 to 4.0.

One piece of this film and rayon non-woven fabric (30 g
/ M ² ) 1 sheet was hot-pressed under the following conditions by an apparatus as shown in FIG. 1st preheating roll ・ ・ ・ 70〜100 ℃ 2nd preheating roll ・ ・ ・ 70〜100 ℃ 1st hot press roll ・ ・ ・ 110 ℃ crimping pressure ・ ・ ・ 2kgf / cm ² Second hot press roll ・ ・ ・ 115 ℃ Pressing pressure ・ ・ ・ ・ ・ ・ 1.0 kgf / cm ² Pressing speed ・ ・ ・ ・ ・ ・ 2.6 m / min

The moisture permeability, water resistance, air permeability, average pore diameter, yield strength, breaking strength and breaking elongation of the obtained composite sheet were measured. The results are shown in Table 1.

Example 2 One piece of the elastomer film produced in Example 1 and one piece of rayon nonwoven fabric (30 g / m ² ) were hot pressed under the following conditions. 1st preheating roll ・ ・ ・ 70〜100 ℃ 2nd preheating roll ・ ・ ・ 70〜100 ℃ 1st hot press roll ・ ・ ・ 110 ℃ crimping pressure ・ ・ ・ 2kgf / cm ² Second hot press roll ・ ・ ・ 110 ℃ Pressing pressure ・ ・ ・ 1.0kgf / cm ² Pressing speed ・ ・ ・ 2.6m / min

The moisture permeability, water resistance, air permeability, average pore diameter, yield strength, breaking strength and breaking elongation of the obtained composite sheet were measured. The results are shown in Table 1.

Example 3 One piece of the elastomer film produced in Example 1 and one piece of rayon nonwoven fabric (30 g / m ² ) were hot-pressed under the following conditions. 1st preheating roll ・ ・ ・ 70〜100 ℃ 2nd preheating roll ・ ・ ・ 70〜100 ℃ 1st hot press roll ・ ・ ・ 110 ℃ crimping pressure ・ ・ ・ 2kgf / cm ² Second hot press roll ・ ・ ・ 125 ℃ Pressing pressure ・ ・ ・ ・ ・ ・ 1.0 kgf / cm ² Pressing speed ・ ・ ・ ・ ・ ・ 5.0 m / min

The moisture permeability, water resistance, air permeability, average pore size, yield strength, breaking strength and breaking elongation of the obtained composite sheet were measured. The results are shown in Table 1.

Comparative Example 1 One piece of the elastomer film produced in Example 1 and one piece of rayon nonwoven fabric (30 g / m ² ) were hot pressed under the following conditions. 1st preheating roll ・ ・ ・ 70〜100 ℃ 2nd preheating roll ・ ・ ・ 70〜100 ℃ 1st hot press roll ・ ・ ・ 110 ℃ crimping pressure ・ ・ ・ 2kgf / cm ² Second hot press roll ・ ・ ・ 90 ℃ Pressing pressure ・ ・ ・ ・ ・ ・ 1.0 kgf / cm ² Pressing speed ・ ・ ・ ・ ・ ・ 2.6 m / min

The moisture permeability, water resistance, air permeability, average pore diameter, yield strength, breaking strength and breaking elongation of the obtained composite sheet were measured. The results are shown in Table 1.

Comparative Example 2 One piece of the elastomer film produced in Example 1 and one piece of rayon nonwoven fabric (30 g / m ² ) were hot pressed under the following conditions. 1st preheating roll ・ ・ ・ 70〜100 ℃ 2nd preheating roll ・ ・ ・ 70〜100 ℃ 1st hot press roll ・ ・ ・ 110 ℃ crimping pressure ・ ・ ・ 2kgf / cm ² Second hot press roll ・ ・ ・ 100 ℃ Pressing pressure ・ ・ ・ ・ ・ ・ 1.0 kgf / cm ² Pressing speed ・ ・ ・ ・ ・ ・ ・ ・ 2.6 m / min

The moisture permeability, water resistance, air permeability, average pore diameter, yield strength, breaking strength and breaking elongation of the obtained composite sheet were measured. The results are shown in Table 1.

Physical Properties of Table 1 Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Water vapor transmission rate ^{( 1)} 768 823 658 233 302 Water resistance ⁽²⁾ 21 12 13 100 or more 100 or more Air permeability ^{( 3)} 56 13 17 2404 279 Average pore size ⁽⁴⁾ 300 100 to 200 300 − ^* 100 Yield strength ⁽⁵⁾ MD 6300 6200 5800 6400 6200 TD 900 1100 1000 1100 900 Break strength ⁽⁶⁾ MD 300 200 400 500 500 TD 400 400 400 500 500 Elongation at break ⁽⁷⁾ MD 245 211 312 453 386 TD 639 634 582 657 666

Note) *: No holes were formed. (1) Water vapor transmission rate: Measured by the water vapor transmission rate test method (40 ° C, 90% RH) according to JIS Z 0208 (unit: g / m ² · da
y). (2) Water resistance: Measured by JIS L1092 waterproof test method (hydrostatic pressure method for low water pressure) (unit: cm). (3) Air permeability: JIS P8117 Air permeability test method (Gurley method)
Measured by (unit: sec / 100cc). (4) Average pore size: measured by electron microscope observation (unit: μ
m). (5) Yield strength: Measured by breaking the nonwoven fabric (unit is g). (6) Breaking strength: JIS L109 for a 25 mm x 150 mm test piece
Measured by a tensile test based on 6 (unit: g). (6) Breaking elongation: JIS L109 for test pieces of 25 mm × 150 mm
Measured by a tensile test based on 6 (unit:%).

As is apparent from Table 1, the composite sheet produced by the method of the present invention has a moisture permeability value of 500 g / m ² · day or more, a water resistance value of 10 cm or more, and an air permeability of value
It was less than 100sec / 100cc. Also, the microporous membranes of Examples 1 and 2 in which only the temperature of the second hot press roll was changed were different in average pore diameter. On the other hand, the composite sheet of each comparative example was inferior in moisture permeability and air permeability. It is considered that this is because the micropores cannot be controlled to a desired size during hot pressing.

[0053]

According to the method of the present invention, when a woven fabric or a non-woven fabric is hot-pressed to a film made of a specific elastomer composition, the hot-pressing is performed in at least two steps, and Since the temperature from the process to the final process is raised below a specific temperature, the micropores formed by hot pressure bonding can be controlled to the desired pore size (around 100 μm), moisture permeability, water resistance and permeability. Good wettability.

The composite sheet according to the method of the present invention as described above is particularly suitable for disposable diapers, disposable sheets, sports goods such as ski wear and the like.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a hot press bonding apparatus for producing a composite sheet by the method of the present invention.

[Explanation of symbols]

 11 ・ ・ ・ ・ ・ Film 12 ・ ・ ・ Nonwoven fabric 13,14 ・ ・ ・ First preheating roll 15, 16 ・ ・ ・ Second preheating roll 17, 18 ・ ・ ・ First hot pressing roll 19, 20 ... Second hot press roll 21 ... Winding roll

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location C08L 23/16 LDJ 7107-4J B29K 55:00 105: 04 B29L 9:00 31:00 4F (72) Inventor Hideaki Toda 3-1, Chidoricho, Kawasaki-ku, Kawasaki-shi, Kanagawa Tonen Chemical Co., Ltd. Technology Development Center

Claims (3)

[Claims] 1. (A) (a) 30-70% by weight of ethylene-propylene-diene copolymer rubber, and (b) 5-30% by weight of vinyl acetate content and 0.2-25 g / 10 min of melt index. From the composition consisting of ethylene-vinyl acetate copolymer 70 to 30% by weight, a film is formed by an air-cooled inflation method, and (B) the film and the woven or non-woven fabric are hot-press bonded to each other to form the film. In the method for producing a waterproof and moisture-permeable composite sheet, which is fixed to the woven fabric or the non-woven fabric and is heat-shrinked, so that the film is microporous, the hot pressure bonding includes a preheating step and at least two-step thermocompression bonding step, The temperature of the first step of the thermocompression bonding process is 100
~ 180 ° C, the final stage temperature is 100-195 ° C, and the temperature rise from the first stage to the last stage is almost zero.
A method for producing a waterproof and moisture-permeable composite sheet, characterized in that the temperature is below + 15 ° C. 2. The method according to claim 1, wherein the hot pressing of the film and the woven or non-woven fabric is carried out by 70 to 100.
℃ preheat process, 100-150 ℃ first hot press bonding process and
Waterproofing performed by a second hot-pressing step of 100 to 165 ° C, and the temperature rise in the first hot-pressing step and the second hot-pressing step is approximately 0 to + 15 ° C or less. A method of manufacturing a moisture-permeable composite sheet. 3. The method according to claim 2, wherein the first and second hot press-bonding steps are performed by a pair of heating and pressing rolls and a receiving roll, respectively, and the receiving roll is releasable. And a roll capable of cooling the pressure-bonded product to 60 ° C. or lower.