JP2003320571A - Manufacturing method for moisture-permeable water- proof sheet, and the moisture-permeable waterproof sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a uniform moisture-permeable waterproof sheet wherein indents or pores are not formed on the non-porous film, and unevenness is not generated in the moisture-permeability and waterproofness at respective sections of the sheet, and the moisture-permeable waterproof sheet; and also, to provide a manufacturing method for a moisture-permeable waterproof sheet wherein the formation of pores and the breakage do not occur even when the non-porous film becomes thinner, and the quality which can sufficiently withstand the commercialization is guaranteed, and the moisture-permeable waterproof sheet. <P>SOLUTION: The moisture-permeable waterproof sheet 5 wherein a moisture-permeable resin 1 is laminated on the surface of an air-permeable base material 2 is manufactured by this manufacturing method. The molten moisture-permeable resin 1 is extruded into a thin film shape by an extrusion die 7. The moisture-permeable resin 1 which is extruded into a thin film shape and the air-permeable base material 2 are press-bonded between a cooling roll 3 having a fine unevenness to release air and a pressing roll 4, and laminated. Thus, air between the moisture-permeable resin 1 and the cooling roll 3 is prevented from being enclosed by this manufacturing method of the moisture-permeable waterproof sheet 5. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a moisture-permeable waterproof sheet and a moisture-permeable waterproof sheet thereof, and more specifically, a moisture-permeable non-porous film having a recess or a hole formed by enclosing air therein. The present invention relates to a method for producing a moisture-permeable waterproof sheet and a moisture-permeable waterproof sheet thereof.

[0002]

2. Description of the Related Art Hitherto, a moisture-permeable waterproof sheet has been used to prevent rainwater and the like from entering a house (waterproofness) and to discharge indoor humidity (moisture permeability). This moisture-permeable and waterproof sheet is generally provided with moisture permeability and waterproofness by laminating a moisture-permeable resin film on a breathable base material such as a cloth or a resin sheet.

As a moisture-permeable and waterproof sheet, a microporous sheet in which a polyolefin-based microporous film such as polyethylene or polypropylene is laminated on a breathable substrate has been conventionally known. Since such a microporous sheet has good moisture permeability and waterproofness and does not cause dew condensation, it is often used as a building material such as a wall exterior material or a roof base material.

However, the moisture-permeable waterproof sheet made of a microporous film cannot be always maintained with good moisture permeability because the pores (fine pores) formed in the film are clogged with dust and dirt. However, it has a drawback that the performance tends to decrease. These drawbacks are eliminated by using a non-porous film instead of the microporous film.

Generally, a non-porous film has a lower moisture permeability than a microporous film, and a moisture-permeable waterproof sheet using it is not always good in terms of moisture permeability and the like. It was However, in recent years, the development of a resin that is non-porous and has a higher water vapor transmission rate has been progressing (JP-A-9-1
No. 87897, etc.), a material having a performance that can be used as the moisture-permeable waterproof sheet has also been developed.

Further, in the case of a microporous film, it is necessary to perform a labor-intensive process such as subjecting the film to a perforating treatment after the film is manufactured and adhering the film to a cloth or the like.
However, if a non-porous film is adopted, it becomes possible to laminate the cloth or the like by directly placing the resin, which is the material of the film, on the cloth or the like in a softened state and pressing the resin. Therefore, since the manufacturing process can be simplified and the reduction of the manufacturing cost associated therewith can be expected sufficiently, the development of this method is being advanced.

However, in practice, when a softened resin is pressure-bonded to a breathable base material such as a cloth with a cooling roll, the moisture-permeable and waterproof sheet produced has moisture-permeable and waterproof ( Water resistance) varies, and does not necessarily result in a uniform sheet. When observing such a moisture-permeable waterproof sheet with an electron microscope, depressions are formed on the surface of the non-porous film, and the depressions reach the fabric as the base material to the extreme (that is, holes are opened). The condition was confirmed.

That is, since moisture and moisture easily pass through the recesses and holes formed in the non-porous film, the moisture permeability in the recesses and holes is extremely high, and the waterproof property is high. It becomes extremely bad. As described above, according to the conventional manufacturing method, the moisture-permeable waterproof sheet produced has too much variation in moisture-permeability and waterproofness, and at present, it has not reached the stage where the quality that can withstand commercialization is sufficiently secured. .

It is thought that the reason why the non-porous film is formed with dents or holes is that air is introduced between the softened resin and the cooling roll during pressure bonding and the air is strongly pressed against the resin by pressure bonding. Has been. FIG. 3 is a schematic diagram for explaining a state in which depressions and holes are formed in the non-porous film at the time of pressure bonding (in the figure, the resin 1 and the air permeable base material 2 are emphasized and expressed thickly).

The resin 1 and the air-permeable base material 2 are sandwiched by the cooling roll 3 and the press roll 4 and are pressure-bonded in a state where the air a is enclosed between the resin 1 and the cooling roll 3. Then, since pressure is applied to the resin 1 in the softened state by pressure bonding, the resin 1 in that portion is pushed down and spread out, and the thickness of the resin 1 (or the nonporous film 6 after being cooled and solidified) Becomes thinner and a recess b is formed.

Further, when the amount of the enclosed air is large, the air pushes the resin 1 further downward and escapes toward the air permeable base material 2, so that the hole c (that is, the through hole) is opened. The phenomenon occurs. In the moisture-permeable waterproof sheet 5 in which the recesses b and the holes c are formed as described above, the moisture permeability is extremely high at the portions of the recesses b and the holes c, or the waterproof property is extremely deteriorated. This point can be easily understood by referring to FIG.

Therefore, in the method of manufacturing the moisture-permeable waterproof sheet, when the resin and the air-permeable base material are pressure-bonded and laminated, the surface of the resin (or the non-porous film) has dents or holes due to the inclusion of air. Is required as a condition.

The moisture permeability of the moisture-permeable waterproof sheet can be improved as the non-porous film becomes thinner.
However, conversely, the thinner the non-porous film is, the more easily air is enclosed in the film so that the holes are more easily opened.

Further, when an external force is applied to such a moisture-permeable waterproof sheet, the non-porous film is torn from the hole portion, and the tendency of the film to break becomes more remarkable. Therefore, it is desired to have a manufacturing method in which even if the non-porous film has a thickness of the order of several tens of μm, no holes are formed and no breakage occurs.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in order to overcome the above-mentioned problems against the background of such circumstances. That is, a method for producing a uniform moisture-permeable waterproof sheet in which no depressions or holes are formed in a non-porous film and variations in moisture permeability and waterproofness do not occur in each portion of the sheet, and the moisture-permeable waterproof sheet. Is to provide.

Further, there is provided a method of manufacturing a moisture-permeable waterproof sheet and a moisture-permeable waterproof sheet thereof, which does not perforate or tear even if the non-porous film is thinned and guarantees a quality sufficient for commercialization. Is to provide. Furthermore, it is possible to provide a method of manufacturing a moisture-permeable waterproof sheet that can perform melting and extrusion of resin, pressure bonding with a breathable base material, etc. in a compact manner, simplifying the manufacturing process and reducing manufacturing cost. Is.

[0017]

Thus, the present inventor has
As a result of earnest research on such a background,
The bonding strength can be increased by pressing the softened resin that has just been extruded from the extrusion die onto the breathable base material, and the manufacturing process can be made compact, and the cooling roll is surprisingly embossed. The present invention has been completed on the basis of this finding that the use of a roll makes it easier for air to move between the cooling roll and the resin, thereby preventing entrapment of air.

That is, the present invention is (1) a method for producing a moisture-permeable waterproof sheet in which a moisture-permeable resin is laminated on the surface of a breathable base material, which comprises extruding a molten moisture-permeable resin in a thin film form, The moisture-permeable resin extruded in the form of a thin film and the air-permeable base material are laminated by pressure bonding between a cooling roll and a press roll to prevent entrapment of air between the moisture-permeable resin and the cooling roll. It exists in the manufacturing method of an elastic sheet.

(2) A method of manufacturing a moisture-permeable waterproof sheet in which a moisture-permeable resin is laminated on the surface of a breathable substrate, wherein the molten moisture-permeable resin is extruded in a thin film form from an extrusion die, The moisture-permeable resin extruded in a thin film and the breathable base material are laminated by pressure bonding between a cooling roll and a press roll having fine unevenness for releasing air, and between the moisture-permeable resin and the cooling roll. It exists in a method of manufacturing a moisture-permeable waterproof sheet that prevents air from being enclosed.

And (3), the cooling roll is
The method is for producing a moisture-permeable waterproof sheet having fine irregularities having a depth of 5 to 20 μm formed by blasting.

Further, (4), the press roll lies in a method of manufacturing a moisture-permeable waterproof sheet having a flexible surface.

Further, (5) is a moisture-permeable waterproof sheet in which a moisture-permeable resin is laminated on the surface of a breathable substrate, and fine irregularities are pressed onto the surface of the laminated moisture-permeable resin. Exists in a breathable waterproof sheet.

Further, (6), the fine irregularities are
It exists in a moisture-permeable waterproof sheet that is pressed by a cooling roll having fine irregularities formed by blasting.

Further, (7), the moisture-permeable waterproof sheet is a moisture-permeable waterproof sheet having a moisture permeability of 1000 g / m ² · 24 hr or more and a water pressure resistance of 5 kPa or more.

Further, (8), the moisture-permeable resin is
It exists in a moisture permeable and waterproof sheet which is a block copolymer polyester resin composed of a hard segment and a soft segment.

Further, (9), the breathable substrate is
It exists in a moisture-permeable waterproof sheet that is a non-woven fabric.

If the present invention meets this purpose,
It is naturally possible to adopt a configuration in which two or more selected from the above 1 to 4 and two or more selected from 5 to 9 are combined.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the method of manufacturing a moisture-permeable waterproof sheet and the moisture-permeable waterproof sheet of the present invention will be described with reference to the drawings.

The method for producing the moisture-permeable waterproof sheet of the present invention is as follows:
The molten moisture-permeable resin is extruded in a thin film form, and the moisture-permeable resin extruded in the thin film form and the air-permeable base material are pressure-bonded between a cooling roll and a press roll for lamination.
Moreover, it is characterized in that air is prevented from being enclosed between the moisture-permeable resin and the cooling roll.

FIG. 1 is a schematic view showing a method of manufacturing a moisture-permeable waterproof sheet of the present invention. In the present embodiment, as shown in FIG. 1, first, the molten moisture-permeable resin 1 is extruded in a thin film form from an extrusion die 7 of an extruder (T die extruder or the like). The moisture-permeable resin 1 extruded into a thin film in this way
Immediately after that, is pressed onto the sheet-like breathable base material 2 between the cooling roll 3 and the press roll 4. At that time, the moisture-permeable resin 1 is cooled and solidified by the cooling roll 3 simultaneously with the pressure bonding to form the moisture-permeable non-porous film 6 which is laminated on the breathable substrate 2.

As described above, according to the present invention, since the moisture-permeable resin 1 in the softened state directly below the extrusion die is directly pressure-bonded to the breathable substrate 2, the non-porous film 6 formed from the moisture-permeable resin 1 is formed. The bonding strength to the breathable base material 2 is extremely strong. As a result, the releasability of the non-porous film 6 from the breathable base material 2 can be suppressed to a minimum, and the tear strength of the moisture-permeable waterproof sheet itself becomes sufficiently large.

Further, according to the method of manufacturing a moisture-permeable waterproof sheet of the present invention, the extrusion of the moisture-permeable resin, the pressure bonding of the moisture-permeable resin and the breathable base material, and the cooling can be collectively performed in a compact manner. . Therefore, the whole manufacturing process is simplified and the manufacturing cost can be reduced.

In the present invention, the use of a roll having fine irregularities formed on its surface (that is, a so-called embossing roll) as the cooling roll prevents air from being enclosed between the moisture-permeable resin and the cooling roll. Can be done (see FIG. 1). In the conventional cooling roll, as described above, since the flat cooling roll is pressed against the moisture-permeable resin in the softened state, air was easily enclosed between the moisture-permeable resin and the cooling roll (Fig. 3).

When fine irregularities are formed on the surface of the cooling roll as in the present invention, the air between the moisture-permeable resin and the cooling roll passes through the fine concave portions on the surface of the cooling roll to leave the gap between them. Escape to and not be enclosed between the two. FIG. 2 is a diagram conceptually illustrating a state in which air between the moisture-permeable resin and the cooling roll escapes to the outside (the arrow f indicates the movement of air, and the arrow m indicates the cooling roll 3 or the resin 1). Etc.).

As described above, the air is transmitted through the minute recesses 3a on the surface of the cooling roll 3 and then in the direction of the arrow f or in FIG.
It can move in a direction perpendicular to the plane of the paper and eventually escape to the outside. As a result, it is possible to prevent the formation of dents or holes in the moisture-permeable resin (that is, non-porous film).

Here, the depth (height) of the fine irregularities on the surface of the embossing roll may be any as long as it allows air to escape. That is, although depending on the thickness of the non-porous film, it is preferably set in the range of 5 to 20 μm.

If the depth is larger than 20 μm, deep irregular marks may remain on the non-porous film, which may adversely affect the moisture permeability and the waterproof property. Further, if the depth is less than 5 μm, the air does not easily move and the air is easily enclosed between the moisture-permeable resin.

The shape of the emboss is free as long as it allows air to escape.
It can be formed in various shapes such as a semicircle, a bell shape, and a polygon. Further, it is also possible to provide streaky irregularities in the length direction or the circumferential direction of the roll, or to form irregularities such as a satin-like shape or a lattice shape. As a specific embossing method, for example, a processing method capable of relatively finely forming fine satin-like irregularities by causing steel balls of 100 to 200 μm to randomly collide with a cooling roll (blasting) There is.

By the way, in the present invention, it is preferable that the moisture-permeable resin (that is, the non-porous film) and the air-permeable substrate are bonded to each other not by partial pressure bonding but by pressure bonding over the entire surface of the sheet. If it is only partially pressed, the non-porous film and the breathable base material may be easily peeled off, and the tear strength as a moisture-permeable waterproof sheet may be reduced.

Therefore, when an embossing roll having fine irregularities formed on the surface is used as the cooling roll, it is preferable that the press roll for pressure bonding together with the cooling roll has a flexible surface. For example, if the press roll 4 is a rubber roll, as shown in FIG. The surface flexes moderately, and the above-mentioned full-face pressure bonding can be realized accurately.

As described above, according to the method of producing a moisture-permeable waterproof sheet of the present invention, a film formed by cooling and solidifying a moisture-permeable resin does not have any dents or holes, and is a breathable substrate such as cloth. It has the advantage that it can be laminated with a moisture-permeable resin. Therefore, the produced moisture-permeable and waterproof sheet is suitable as a building material such as a wall exterior material or a roof base material.

However, the present invention is not limited to the production of the moisture-permeable waterproof sheet due to its excellent characteristics. That is, in the manufacturing process of sheets formed by laminating resin on cloth, etc., such as industrial material applications such as water-blocking sheets at waste disposal sites, lining of tents, lining of outdoor clothing such as rainwear, etc. Is, of course, also useful.

Next, the moisture-permeable waterproof sheet of the present invention will be described. The moisture-permeable waterproof sheet of the present invention is formed by being pressure-bonded by a cooling roll having fine irregularities on the surface by the above-described manufacturing method, and thus is formed of a laminated moisture-permeable resin (or a moisture-permeable non-porous film). As a result, fine unevenness is pressed onto the surface. Also, if the moisture-permeable waterproof sheet is formed by pressure bonding of a cooling roll having fine irregularities formed by blasting, the moisture-permeable resin surface corresponds to the fine irregularities on the surface of the cooling roll. The fine irregularities thus formed are pressed.

The non-porous film used for the moisture-permeable waterproof sheet is required to be moisture-permeable as described above. Incidentally, it is preferable that the film thickness of the moisture-permeable non-porous film is usually 10 to 50 μm.

Examples of the moisture-permeable resin forming the moisture-permeable non-porous film include polyester resin, polyamide resin, polyolefin resin, polyurethane resin and the like. Among them, a polyester resin that satisfies the above conditions and is easy to handle with a T-die extruder is particularly preferable, and a block copolymer polyester resin including a hard segment and a soft segment is more preferable.

The hard segment is obtained by reacting a dicarboxylic acid component and a diol component. As the dicarboxylic acid component, phthalic acid, isophthalic acid, terephthalic acid,
Examples thereof include aromatic dicarboxylic acids such as naphthalenedicarboxylic acid, and aliphatic dicarboxylic acids such as succinic acid, adipic acid and sebacic acid. Examples of the diol component include aliphatic diols such as ethylene glycol and neopentyl glycol, and aromatic diols such as cyclohexanedimethanol and paraxylene glycol.

As the soft segment, polyether and / or aliphatic polyester is used. Examples of the polyether include polyethylene glycol, polytetramethylene glycol, polyhexamethylene glycol and the like, and examples of the aliphatic polyester include polyethylene adipate, polybutylene adipate, polycaprolactone and the like.

The block copolymerized polyester resin composed of the hard segment and the soft segment can be easily produced by a known method such as transesterification reaction. Further, if necessary, one or more kinds of ultraviolet absorbents, antioxidants, antistatic agents, flame retardants, antibacterial agents, pigments, stabilizers, defoamers, etc. may be added to the moisture-permeable resin. It is also possible.

Next, the breathable substrate used in the present invention is not particularly limited as long as the breathability is maintained, and examples thereof include forms such as paper, non-woven fabric, woven fabric and knitted fabric. Among them, non-woven fabric is preferable from the viewpoints of durability and manufacturing cost. Examples of the material of the non-woven fabric include fibers such as polyethylene, polypropylene, polyamide and polyester.

The non-woven fabric can be produced by a known flash spinning method, melt blow method, spun bond method, needle punch method, spun lace method, or the like. Further, if both the film and the non-woven fabric are made of a polyester composition, there is no need to separate them when recycling the moisture-permeable waterproof sheet,
This is preferable because the recycling cost can be reduced.

In order to have a sufficient function as a moisture-permeable waterproof sheet obtained by laminating the moisture-permeable resin (non-porous film) as described above and a breathable substrate, the moisture-permeable moisture-permeable sheet has a moisture permeability of 1000 g. / M ² · 24 hr or more, it is preferable that the water pressure resistance showing waterproof property is 5 kPa (about 500 mmH ₂ O) or more. Therefore, the moisture-permeable non-porous film constituting the moisture-permeable waterproof sheet has a moisture permeability of at least 1.
000g / m ² · 24hr or more, water pressure resistance is 10k
It is preferably Pa (about 1000 mmH ₂ O) or more.

Although the present invention has been described above, the present invention is not limited to the embodiments and the examples described later, and various other modifications are possible without departing from the essence thereof. Needless to say.

For example, as described above, the present invention is used for industrial materials such as water-blocking sheets in waste treatment plants, lining of tents,
It can also be used in manufacturing processes such as lining of outdoor clothing such as rainwear. At that time, in order to exert the performance required for the water-impervious sheet, the material and material of the breathable base material and the resin to be laminated are appropriately selected, and the depth of the unevenness of the embossing roll and the shape of the embossing are naturally preferable. It can be changed to anything.

[0054]

EFFECTS OF THE INVENTION According to the present invention, a uniform moisture-permeable and waterproof sheet having no pits or holes formed in a non-porous film and having uniform moisture-permeability and water-proof property at each part of the sheet is produced. can do. In addition, even if the non-porous film is thinned, it is possible to manufacture a moisture-permeable waterproof sheet that does not have holes or breaks and sufficiently guarantees a quality that can be commercialized. Further, the manufacturing process can be made compact and the manufacturing cost can be reduced.

[0055]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not necessarily limited to the examples. The moisture permeability (moisture permeability) and waterproofness (water pressure resistance) of the moisture-permeable waterproof sheet in Examples and Comparative Examples, and the thickness of the nonporous film in the moisture-permeable waterproof sheet were measured by the following method. .

(1) Thickness of non-porous film at each point of moisture-permeable waterproof sheet A cross-sectional photograph of the moisture-permeable waterproof sheet is taken with an electron microscope (2
00 times), and the thickness of the non-porous film was measured as an average thickness of about 0.5 mm width (unit: μm).

(2) Moisture permeability at each point of the moisture permeable waterproof sheet The moisture permeability of the moisture permeable waterproof sheet is defined by JIS L 1099 A.
-1 method (calcium chloride method) (measured in g /
m ² .24 hr). Three measurement points were randomly selected near the right end, the center, and the left end of the moisture-permeable waterproof sheet.

(3) Water resistance at each point The moisture resistance of the waterproof sheet is measured according to JIS L 1092.
6.1 Measured by method B (high water pressure method) (unit: kP
a). Three measurement points were randomly selected near the right end, the center, and the left end of the moisture-permeable waterproof sheet.
The measurement points of (1) to (3) were independently selected.

Example 1 A polyester spunbond nonwoven fabric (manufactured by Unitika Ltd., weight 40
g / m ² ) and the resin used is a moisture-permeable resin, Perprene P-20BU (manufactured by Toyobo Co., Ltd., block copolymerized polyester resin), and the resin is melted at a T-die temperature of 240 ° C. by a T-die extruder. Then, the resin and the non-woven fabric were pressure-bonded to the entire surface with a cooling roll immediately below and laminated to obtain a moisture-permeable waterproof sheet having a film thickness of 20 μm and a total thickness of 165 μm. At this time, as a cooling roll, 100 to
An embossing roll having an inverted design of a satin-like shape (maximum depth of about 20 μm) in which irregularities were randomly formed with 200 μm steel balls was used. A rubber roll was used as the press roll. The obtained moisture-permeable and waterproof sheet was measured by the above-mentioned measuring method. The results are shown in Table 1.

Example 2 As a cooling roll, 20 to 3
A film thickness of 20 μm was produced in the same manner as in Example 1 except that an embossing roll designed to have a satin-finished shape (maximum depth of about 10 μm) in which unevenness was randomly formed with 0 μm steel balls was used.
A moisture-permeable and waterproof sheet having a thickness of 165 μm and a total thickness of 165 μm was obtained. The obtained moisture-permeable and waterproof sheet was measured by the above-mentioned measuring method. The results are shown in Table 1.

Example 3 As a cooling roll, # 100
Film thickness 2 was produced in the same manner as in Example 1 except that an embossing roll having a mesh (maximum depth of about 10 μm) was used.
A moisture-permeable waterproof sheet having a thickness of 0 μm and a total thickness of 165 μm was obtained. The obtained moisture-permeable and waterproof sheet was measured by the above-mentioned measuring method. The results are shown in Table 1.

Comparative Example (Conventional Example) A film having a thickness of 2 was produced in the same manner as in Example 1 except that a normal roll having a flat surface was used as the cooling roll.
A moisture-permeable waterproof sheet having a thickness of 0 μm and a total thickness of 165 μm was obtained. The obtained moisture-permeable and waterproof sheet was measured by the above-mentioned measuring method. The results are shown in Table 1.

[0063]

[Table 1]

Further, based on the measurement results of Table 1, the variation of each measured value in the Examples and Comparative Examples (the value obtained by subtracting the minimum value from the maximum value of the 9 measured values) is summarized in Table 2. .

[0065]

[Table 2]

[Evaluation] It can be seen that the variation in each measured value in Examples 1 to 3 is apparently small as compared with the comparative example (conventional example). In fact, the variation rate of the measured values in the examples is 15% at the maximum in the film thickness of 20 μm (Examples 1 to 3), and about 11% at the maximum in the water vapor transmission rate (Example 3). ), The maximum water pressure resistance is about 8.8% based on the average value (Example 1).
Is. On the other hand, in the comparative example (conventional example), the ratio of variation in measured values is calculated in the same manner, and the maximum film thickness is 75%, the maximum moisture permeability is about 24%, and the maximum water pressure resistance is about 7%.
It was 6%.

As described above, according to the method for producing a moisture-permeable waterproof sheet of the present invention, a moisture-permeable waterproof sheet having substantially uniform thickness of the non-porous film, that is, a non-porous film having no dents or holes is obtained. You can see that you can get it. Further, it is therefore understood that in each part of the sheet, a uniform moisture-permeable and waterproof sheet having little variation in moisture permeability (moisture permeability) and water pressure resistance (waterproofness) can be obtained.

Furthermore, as clearly shown in Table 1,
Even if the non-porous film is as thin as about 20 μm,
It is possible to manufacture the non-porous film with a substantially uniform thickness. Thus, according to the method for producing a moisture-permeable waterproof sheet of the present invention, even if the non-porous film is thinned, the variation in moisture permeability and waterproofness is very small, and a quality that can withstand commercialization is sufficiently obtained. It is possible to manufacture a moisture-permeable waterproof sheet that guarantees.

[Brief description of drawings]

FIG. 1 is a schematic view showing a method for producing a moisture-permeable waterproof sheet of the present invention.

FIG. 2 is a diagram conceptually showing a state in which air between a resin and a cooling roll moves and is discharged.

FIG. 3 is a schematic view showing a state where depressions and holes are formed in a non-porous film during pressure bonding.

[Explanation of symbols]

1 ... Resin 2 ... Breathable substrate 3 ... Cooling roll 3a ... Fine recess 4 ... Press roll 5: Breathable waterproof sheet 6 ... Non-porous film 7 ... Extrusion die a ... air b ... dent c ... hole f ... Direction of air movement m: Direction of movement of cooling rolls, etc.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B29L 9:00 B29L 9:00 F term (reference) 2E001 DA01 DB04 DB05 FA09 FA16 GA23 GA24 GA28 HD11 KA05 MA01 NA07 4F100 AK01B AK41B AL02B AT00A BA02 BA07 DD01B DG15A GB72 GB90 JB07 JD02A JD04B JD05 4F207 AA24F AD16 AE10 AG01 AG03 AH46 KA01 KA17 KB26 KK65

Claims (9)

[Claims] 1. A method for producing a moisture-permeable waterproof sheet in which a moisture-permeable resin is laminated on the surface of a breathable substrate, the molten moisture-permeable resin being extruded into a thin film, and the moisture permeability being extruded into the thin film. A resin and an air permeable base material are pressure-bonded and laminated between a cooling roll and a press roll to prevent entrapment of air between the moisture-permeable resin and the cooling roll. Production method. 2. A method for producing a moisture-permeable waterproof sheet in which a moisture-permeable resin is laminated on the surface of a breathable substrate, the molten moisture-permeable resin being extruded in a thin film form from an extrusion die, and extruded in the thin film form. The moisture-permeable resin and the breathable base material are pressure-bonded and laminated between a cooling roll and a press roll having fine irregularities for allowing air to escape, and air is enclosed between the moisture-permeable resin and the cooling roll. A method for producing a moisture-permeable waterproof sheet, which is characterized by being prevented. 3. The method for producing a moisture-permeable waterproof sheet according to claim 2, wherein the cooling roll has fine irregularities having a depth of 5 to 20 μm formed by blasting. 4. The method of manufacturing a moisture-permeable waterproof sheet according to claim 2, wherein the press roll has a flexible surface. 5. A moisture-permeable waterproof sheet in which a moisture-permeable resin is laminated on the surface of a breathable base material, wherein fine irregularities are pressed onto the surface of the laminated moisture-permeable resin. Breathable waterproof sheet. 6. The moisture-permeable waterproof sheet according to claim 5, wherein the fine irregularities are applied by a cooling roll having fine irregularities formed by blasting. 7. The moisture-permeable waterproof sheet has a moisture permeability of 10
00g / m ² · 24hr or more, and water pressure resistance is 5kPa
It is above, The moisture-permeable waterproof sheet of Claim 5 characterized by the above-mentioned. 8. The moisture-permeable waterproof sheet according to claim 5, wherein the moisture-permeable resin is a block copolymer polyester resin including a hard segment and a soft segment. 9. The moisture-permeable waterproof sheet according to claim 5, wherein the breathable base material is a non-woven fabric.