JP2001277385A - Waterproof sheet and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent moisture from penetrating inside from the edge faces on both sides of a waterproof sheet having a resin layer laminated on both surface/back faces of a fibrous base fabric for reinforcement and also effectively prevent an interlayer peeling from being generated during laying/using the waterproof sheet to ensure the enhancement of its durability. SOLUTION: This waterproof sheet 1 has waterproof resin layers 3, 4 laminated covering both surface and back of the fibrous base fabric 2 for reinforcement in one piece. The back side resin layer 3 is laminated covering the entire face of the fibrous base fabric 2 and the surface side resin layer 4 is wider than the back side resin layer 3. In addition, both side edge parts of the surface side resin layer 4 is crowded out and laminated on the surface side of the fibrous base fabric 2. A part of the crowded-out part is turned around to the back side and the opposite mutual contact faces of the part are fusion-bonded and joined together on both side edge surfaces of the back side resin layer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof sheet used for a reservoir, a waste disposal site, a river bank, a pool, a heat storage layer, a roof, a veranda, and the like, and a method of manufacturing the waterproof sheet.

[0002]

2. Description of the Related Art Conventionally, as a waterproof sheet excellent in strength and dimensional stability, a waterproof sheet having a structure in which waterproof front and back resin layers are laminated on both front and back surfaces of a reinforcing fiber base fabric is known. This kind of waterproof sheet is usually prepared as a long roll cut into a predetermined width, but since the fiber base fabric supplements the mechanical properties of the resin layer with low tensile strength or tear strength, It is awarded for various waterproofing works that require high strength.

[0003] However, most of the practically used waterproof sheets are formed by laminating and integrating a fiber base cloth and resin layers on both the front and back surfaces, and then trimming both side edges thereof to prepare a predetermined width to finish. As shown in FIG. 4, the fiber base cloth (12) and both resin layers (13) (1)
4) was in a state where the lamination interface was exposed.

For this reason, when water comes into contact with the end face, the water penetrates into the inside of the waterproof sheet through the gaps between the fibers of the fiber base fabric, and causes deterioration of the fibers, such as deterioration of the fibers, contamination, and generation of mold. , And also causes delamination of the waterproof sheet,
As a result, there is a problem that the reinforcing effect of the fiber base fabric is reduced. Further, as a measure for preventing water from entering from the end face, a method of performing a water-repellent treatment on the fiber base fabric is considered,
In this case, the peeling strength of the waterproof sheet is reduced.

Therefore, in the case of laying construction using such a waterproof sheet, a side edge of the waterproof sheet (11) is previously covered with a waterproof film (15) such as a resin film as shown in FIG. Or (a) in FIG.
As shown in (b), the adjacent waterproof sheet (11) and the edge are overlapped and sequentially joined, and then the joining section (1)
0) The laminated interface exposed on the top is covered with a waterproof coating (15).
And a sealing material (16).

However, the above-described end face covering work is extremely troublesome, requires extra time and labor, is not only economically disadvantageous, but also causes a reduction in construction work efficiency on site. Further, there is a possibility that the durability is adversely affected.

On the other hand, in response to such a request, conventionally, for example, Japanese Unexamined Patent Publication No. 10-217375 and
As can be seen in Japanese Patent Publication No. 203, the width of the resin layer on the front and back sides is made wider than the width of the fiber base cloth, and the both side edges are protruded to form a joint. A so-called bag-bound waterproof sheet has been proposed.

However, even with such a waterproof sheet, the bonding interface between the front and back resin layers is exposed on both side end faces.
There is a concern that water may enter from the above-mentioned joint interface due to the influence of expansion stress and the like during the laying use, and it is also likely that wrinkles are likely to occur in the resin layers on the front and back surfaces in the manufacturing process, making it difficult to manufacture a uniform product In fact, it has not been put into practical use as a general-purpose product for the reason presumed to be caused by the above.

[0009]

SUMMARY OF THE INVENTION In view of the above background, the present invention relates to a high-strength waterproof sheet in which a fiber base fabric for reinforcement is installed, which is more excellent in waterproof function and durability. And its simple manufacturing technology.

[0010]

According to the first aspect of the present invention, there is provided a waterproof sheet in which a waterproof resin layer is coated and laminated on both front and back surfaces of a reinforcing fiber base fabric. In the back side resin layer, while being laminated over the entire surface of the fiber base cloth, the front side resin layer is wider than the back side resin layer, the side edges protruding state of the fiber base cloth By being laminated on the front surface side, a part of the protruding portion goes around the back surface side, and the opposing contact surfaces are fusion-bonded to both side edge surfaces of the back surface side resin layer, and the waterproof sheet is characterized by being formed. Is the gist.

In this waterproof sheet, both side edges are covered with the surface side resin layer, and no joining interface is exposed there. For this reason, the end face waterproofing property can be secured by itself, and it is not necessary to provide a separate coating for end face waterproofing treatment as in the related art, which is economically advantageous, and can also improve the laying work efficiency on site. Also, by being able to reliably prevent water from penetrating into the fiber base fabric inside from both side edges,
Factors of quality deterioration such as fiber deterioration, fouling and generation of mold as described above can be eliminated, and durability can be improved.

In addition, since the joining interface between the front-side resin layer and the back-side resin layer is located on the lower surface near the both side edges of the waterproof sheet, the adjacent waterproof sheet and the edge are overlapped when laying. In the case of joining, the joining interface between the two resin layers can be located in the sheet joining portion. For this reason, even if stress is applied to the sheet joining portion due to the influence of expansion and contraction of the waterproof sheet, no peeling stress acts on the joining interface of the front and back resin layers, and water intrusion from the interface is more reliably prevented. In addition to the above, the stress acts on both the front and back resin layers at the same time, so that the separation between the front and back resin layers can be suppressed.

Further, the presence of the bonding interface on the back surface side of the waterproof sheet facilitates identification of the front and back surfaces of the waterproof sheet at the time of laying work, which can contribute to improvement of workability. Also, even if the resin layers on the front and back surfaces are configured to be different colors from each other, the above-mentioned identification is more easily performed, but since the lamination interface is not exposed to the outer surface in the laid state, it is possible to obtain a laid state with a good appearance. it can. Also, the resin layer on the back side
Since it does not come into contact with water in the laid state, it is also possible to add an inorganic filler or the like that is inferior in water absorbency to the back side resin layer, thereby reducing material costs,
Moreover, it is possible to provide a waterproof sheet having more excellent dimensional stability.

In a preferred embodiment of the waterproof sheet according to the present invention, the width of the protruding portion of the front-side resin layer is set to 1 to 30 mm, and both ends of the rear-side resin layer are set. The width of the edge protruding from the edge of the fiber base fabric side is set to 0 to 10 mm.

By setting the dimensions as described above, when the joint is formed with a joint width of 20 to 50 mm, which is the overlap joint width with the adjacent waterproof sheet usually used for laying, at least the joint area near the joint is used. The fiber base fabrics in the two waterproof sheets adjacent to each other at the position can be positioned almost continuously in the surface direction, and a waterproof layer having a balanced strength can be applied to the entire area.

According to a third aspect of the present invention, there is provided a method of manufacturing a waterproof sheet, wherein the entire surface of the fiber base cloth having a predetermined width is covered, and the back side resin layer is heated and pressed for lamination and integration. A first step of obtaining a single-area layer sheet having a predetermined width; and a front-side resin layer having a width wider than the back-side resin layer on both sides of a surface of a fiber base fabric of the single-area layer sheet obtained by the first step. And a second step of arranging in a protruding manner, heating and pressing, and laminating and integrating.

According to this method, a waterproof sheet having the above-mentioned various properties can be easily and efficiently produced as a uniform product in a simple process.

In this case, after the fiber base fabric and the backside resin layer are laminated and integrated in the first step, the both side edge portions are perpendicular to the sheet surface. By cutting into a one-area layer sheet having a predetermined width, the joining between the wraparound portion of the front-side resin layer to the back side and both side edges of the back-side resin layer can be performed more reliably at a vertical bonding interface. And there is little possibility that defective bonding occurs.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of a waterproof sheet according to the present invention and a method of manufacturing the same will be described below with reference to the drawings showing embodiments.

In FIG. 1, a waterproof sheet (1) according to the present invention is formed by coating and laminating a waterproof resin layer (4) and a back resin layer (3) on both front and back surfaces of a fiber base cloth (2). It is integrated.

The back side resin layer (3) needs to be laminated so as to cover at least the entire back surface of the fiber base cloth (2), but has a slightly wider width than the fiber base cloth (2). Alternatively, both side edges may be stacked in a protruding state. In this case, it is desirable that the above-mentioned width of the back side resin layer (3), that is, the width (W2) of the fiber base fabric (2) protruding from both side edge portions is set to 10 mm or less. In a setting exceeding 10 mm, a portion having mechanical strength relatively inferior to the intermediate portion is formed over a relatively wide range on both side edges of the waterproof sheet (1), and adjacent portions are formed as shown in FIG. When the waterproof sheets (1) are joined to each other and laid, a fiber base cloth (2) is attached to the sheet joint (6).
(2) is not preferable because it is easy to form a portion that is not continuous. Therefore, the protruding width (W2) is 0 to 10 m.
m, particularly preferably about 0 to 5.0 mm.

Next, the front side resin layer (4) is relatively wider than the back side resin layer (3), and is laminated with both side edges protruding. Moreover, a part of the protruding portion (4a) wraps around the back surface side to cover both side edge portions of the fiber base fabric (2) and both side edge surfaces (3a) of the back side resin layer (3) from the outside. The facing surface is fusion-bonded to the end surface (3a). Therefore, the resin layer bonding interface (5) exists in a direction substantially perpendicular to the surface direction of the waterproof sheet (1), and its outer end is located on the lower surface of the waterproof sheet (1). .

The width (W1) of both side edges of the front side resin layer (4), that is, the distance from the both side edge surfaces (3a) of the back side resin layer (3) is set in the range of 1 to 30 mm. Is preferred. The width (W1) of this is 1.0
When it is set to less than mm, poor bonding with the backside resin layer (3) at the bonding interface (5) is likely to occur, and the sealing performance of the fiber base fabric (2) may be impaired. Conversely, when the width is set to be wider than 30 mm, the side edges of the adjacent waterproof sheets (1) and (1) are laid with a general joint width (L) of about 20 to 50 mm in the same manner as described above. It is not preferable to join them in an overlapping manner because discontinuous portions of the fiber base fabrics (1) and (2) are likely to be formed between adjacent waterproof sheets. Most preferably, the protrusion width (W1
) Is preferably set to about 10 to 20 mm.

The reinforcing fiber base fabric (2) used in the waterproof sheet (1) of the present invention is a woven fabric composed of synthetic fibers, natural fibers, inorganic fibers, or two or more composite fibers selected from these. It is a cloth or a nonwoven fabric, and a woven fabric using a polyester filament yarn is preferable as a typical example.

The front and back side resin layers (3) and (4) are made of a soft, flexible and water-resistant resin such as polyvinyl chloride resin, ethylene / vinyl acetate copolymer, A polyolefin resin or the like is applied, but is not limited thereto. In this case, the same kind of resin is usually applied to the back side resin layer (3) and the front side resin layer (4), but different kinds of resins may be used as long as they are compatible with each other. It may be of a different color. In particular, when they are colored in different colors, it is easy to distinguish the front and back surfaces during the laying work, which is convenient for the laying work. Also, since the back side resin layer (3) does not come into contact with external water when laid, it is acceptable to use a resin composition filled with an inorganic filler which is advantageous in terms of cost. The back side resin layer (3) has
As the filler, for example, a filler having water absorption itself but excellent in dimensional stability, such as calcium carbonate, can be used.

The waterproof sheet (1) generally has a width of 1
It is provided as a long roll of about 200 to 200 cm and a thickness of about 1.2 to 4.0 mm, but is not necessarily limited to these dimensional specifications and forms.

Next, a preferred method of manufacturing the waterproof sheet (1) will be described with reference to FIG.

First, in the first step, as shown in FIG. 3A, a fiber base fabric (2) is placed on the backside resin layer (3).
They are arranged so that their center portions in the width direction coincide with each other, and are laminated and integrated by heating and pressing. Then, both side edge portions of this laminate are dashed lines (m) on the outside or inside of the fiber base cloth (2). (M ') at right angles to the sheet surface to produce a one-layer sheet (1a) having a predetermined width. In this case, when the width of the fiber base cloth (2) is larger than the set width of the one-area layer sheet (1a), the fiber base cloth (2) is cut along a chain line (m ') inside the edge portions on both sides. .

The production of the single-layer sheet (1a) is as follows.
It can be carried out by employing a generally known molding method, for example, by using an extrusion molding method or a calendar molding method. That is, while continuously forming the backside resin layer (3) into a sheet having a predetermined thickness by using an extruder or a calendar, the fiber base cloth (2) is overlapped on the upper surface of the resin layer (3) in a melt-softened state. They can be easily manufactured by passing them together through a press roll, laminating them together, and cutting them to a predetermined width along the dashed line (m) or the dashed line (m ').

Next, in the second step, FIG.
As shown in the figure, the single-layer sheet (1a) obtained above
A surface resin layer in a melt-softened state continuously formed into a sheet having a predetermined thickness and a width wider than the one-area layer sheet (1a) by using an extruder or a calendar on the fiber base fabric (2). 4) while arranging them so that the center portions in the width direction of the two sheets coincide with each other, that is, the two side edges are arranged in the one-area layer sheet (1).
The sheets are overlapped under the condition of protruding from both side edges of a), passed through a press roll, and heated and pressed to be integrated.

As a result, the protruding portions (4a) of both side edges of the front side resin layer (4) are partially wrapped in the back side direction to cover both side edge end surfaces of the single area layer sheet (1a). At the same time, the opposing contact surfaces with the both side edges of the backside resin layer (3) are fusion-bonded to the end surfaces, and as shown in FIG. 1, a bonding interface perpendicular to the sheet surface of the waterproof sheet (1) ( 5) is formed, and the desired waterproof sheet (1) is completed. If necessary, after the second step, both sides of the waterproof sheet (1) may be cut to adjust the waterproof sheet (1) to a predetermined width.

According to the manufacturing process of the waterproof sheet (1) described above, the bonding interface (5) between the resin layers (3) and (4) on both the front and back surfaces has a unique configuration in which the lower surface side of the waterproof sheet (1) is located. Although it is a waterproof sheet, it can be efficiently manufactured by an extremely common extrusion molding / lamination integration method using an extrusion molding method without adding any other special means.

As shown in FIG. 2, the waterproof sheet (1) is formed at a site where the waterproof sheet (1) is laid, by adhering both side edges of the adjacent waterproof sheets (1) and (1) to a predetermined overlapping width (L). And bonded together using an adhesive such as an organic solvent or a resin solution, or bonded by heat fusion. Example 1 As a fiber base fabric, a long woven fabric having a width of 155 cm and woven at a density of 4 warps and 4 wefts per 25.4 mm with a polyester filament of 500 deniers was used.
As the resin layer on the front and back surfaces, a soft vinyl chloride resin composition having the following composition was used.

[Soft vinyl chloride resin composition] 100 parts by weight of PVC 60 parts by weight of plasticizer (DOP) 2 parts by weight of stabilizer (Sn) 2 parts by weight of pigment 5 parts by weight of ultraviolet absorber 0.5 part by weight of the ultraviolet absorber The above composition is extruded into a sheet or a film having a thickness of 0.7 mm and a width of 155 cm by an extruder for a resin layer, and the same is superimposed on one surface of the fiber base fabric in a melt-softened state while keeping the width uniform. They were combined, pressed through a press roll, and laminated and integrated. Then, both edges of the laminated sheet were cut to produce a long single-layer sheet having a width of 148 cm.

Next, for the surface-side resin layer, the above resin composition was extruded into a sheet or film having a thickness of 0.8 mm and a width of 155 cm by an extruder. The sheets were superposed on both sides of the fiber base fabric, and were laminated under pressure. Thereafter, the sheet or film for a front-side resin layer is cut so that portions having a width of 10 mm on both side edges thereof protrude outward from both side edges of the single-layer sheet, and are cut into a width of 150 cm and a thickness of 1.5 mm.
mm waterproof sheet was obtained.

In the waterproof sheet obtained as described above, a part of the protruding portion is wrapped around the back surface, that is, both side edges of the single-layer sheet, to cover the both side edges, and is provided on the side edge end surface. The waterproof sheet was a state in which the opposing contact surfaces were fusion-bonded, and the fiber base fabric was completely wrapped tightly between the resin layers on the front and back surfaces.

Observation of both side edges of the waterproof sheet revealed that the edges were covered only by the surface-side resin layer having an increased thickness, and the bonding interface between the surface-side resin layer and the back-side resin layer was waterproof. It could be confirmed that the sheet existed in a substantially vertical arrangement at a position inward of about 10 mm from both side edges of the sheet.

Further, the waterproof sheet produced as described above was joined by bonding with an adhesive with the overlap joining width (L) shown in FIG. 2 being 30 mm, and the joining interface of the front and back resin layers of the waterproof sheet and the interface thereof were obtained. The end was completely sealed in the adhesive interface part and was not visible at all from the outside.

Further, a long-term water storage test was performed on the waterproof sheet produced as described above, assuming that the sheet was connected as shown in FIG. 2 as a water tank wall. No generation of mold was observed, and it was confirmed that no water had penetrated into the fiber base fabric. Example 2 The same procedure as in Example 1 was repeated except that a woven fabric made of 1000-denier polyester filament yarn was used for the fiber base fabric, and a polyethylene-polypropylene copolymer resin was used for the resin layers on the front and back surfaces. And a waterproof sheet.

When the both ends of the waterproof sheet produced above were observed in the same manner as in Example 1, the same observation results as in Example 1 were obtained.

Further, a long-term water storage test was performed on the waterproof sheet produced as described in Example 1, and the same test result as in Example 1 was obtained.

[0042]

The waterproof sheet according to the first aspect of the present invention has excellent mechanical strength and dimensional stability by enclosing a fiber base fabric between the front and back resin layers, and also has both side edges. It is covered with the surface-side resin layer, and no bonding interface is exposed there. For this reason, the end face waterproofing property can be secured by itself, and it is not necessary to provide a separate coating for end face waterproofing treatment as in the related art, which is economically advantageous, and can also improve the laying work efficiency on site. In addition, since it is possible to reliably prevent water from penetrating into the internal fiber base fabric from both end edges, it is possible to eliminate quality deterioration factors such as fiber deterioration, soiling, and generation of mold, thereby improving durability.

In addition, since the joining interface between the front-side resin layer and the back-side resin layer is located on the lower surface near the both side edges of the waterproof sheet, the adjacent waterproof sheet and the edge are overlapped when laying. In the case of joining, the joining interface between the two resin layers can be located in the sheet joining portion. For this reason, even if stress is applied to the sheet joining portion due to the expansion and contraction of the prevention sheet, no peeling stress acts on the joining interface between the front and back resin layers, and water intrusion from the interface is more reliably prevented. In addition to the above, the stress acts on both the front and back resin layers at the same time, so that the separation between the front and back resin layers can be suppressed.

Further, the presence of the bonding interface on the back surface side of the waterproof sheet makes it easy to identify the appearance of the front and back surfaces of the waterproof sheet at the time of laying work, which can contribute to improvement of workability. Also, even if the resin layers on the front and back surfaces are configured to be different colors from each other, the above-mentioned identification is more easily performed, but since the lamination interface is not exposed to the outer surface in the laid state, it is possible to obtain a laid state with a good appearance. it can. Also, since the resin layer on the back side does not come into contact with water in the laid state,
The back side resin layer can be made of a material to which an inorganic filler or the like that is inferior in water absorbency is added, so that a material sheet can be reduced and a waterproof sheet with more excellent dimensional stability can be provided. become.

According to the second aspect of the present invention, the widths of the protruding portions at both side edges of both the resin layers on the front and back surfaces are set within a predetermined range, so that the adjoining portions usually used when laying are used. 20 to 5 which is the overlap joining width with the waterproof sheet
In the case of joining with a joining width of 0 mm, the fiber base fabrics in the two waterproof sheets adjacent to each other at least in the vicinity of the joining portion can be located substantially continuously in the surface direction, and a waterproof layer having a balanced strength in the entire area. Can be constructed.

According to the method for manufacturing a waterproof sheet according to the third aspect of the present invention, a waterproof sheet having the above-described various characteristics can be easily manufactured as a uniform product efficiently and easily in a simple process. be able to.

Further, in this case, by forming the structure as described in the fourth aspect of the present invention, the joining between the wraparound portion of the front side resin layer toward the back side and the side edges of the back side resin layer can be performed.
The bonding can be performed more reliably without causing poor bonding.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a waterproof sheet according to the present invention.

FIG. 2 is a partially omitted transverse cross-sectional view showing an example of a joint state when laying a waterproof sheet according to the present invention.

3A and 3B show a manufacturing process of the waterproof sheet of the present invention. FIG. 3A is a partially omitted cross-sectional view of the one-layer sheet obtained in the first step, and FIG. 2B is a second step. FIG. 4 is a partially omitted transverse cross-sectional view showing the state of lamination of the surface-side resin layer in FIG.

FIG. 4 is a cross-sectional view showing a configuration of a conventional waterproof sheet.

5 (a) and 5 (b) are partially omitted cross-sectional views of different joining states, respectively, showing a joining state of a conventional waterproof sheet. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Waterproof sheet 1a ... One area layer sheet 2 ... Fiber base cloth 3 ... Back side resin layer 3a ... Side edge end face 4 ... Front side resin layer 4a ... Protruding part 5 ... Joining interface

Continued on the front page F-term (reference) 2D018 DA03 4D004 AA46 BB05 4F100 AK01B AK01C AK15 BA03 BA06 BA07 BA10B BA10C CA04 CA05 CA07 CA13 DB15 DD31 DG11A DG15A EA021 EC03 EC033 EJ19 EJ192 EJ283 J05J01J05 GB05

Claims (4)

[Claims] 1. A waterproof sheet in which a waterproof resin layer is coated and laminated on both front and back surfaces of a fiber base cloth for reinforcement, wherein a back side resin layer is laminated so as to cover the entire surface of the fiber base cloth. The front side resin layer is wider than the back side resin layer, and both side edges are protruded so as to be laminated on the front side of the fiber base fabric, so that a part of the protruding portion goes around to the back side. A waterproof sheet characterized in that opposing contact surfaces are fusion-bonded to both side edge surfaces of the back surface side resin layer. 2. The width of the protruding portion of the front side resin layer is set to 1 to 30 mm, and the width of both side edges of the back side resin layer protruding from the edge of the fiber base fabric side is 0 to 10 mm.
The waterproof sheet according to claim 1, wherein the waterproof sheet is set to: 3. A first step of obtaining a one-area layer sheet having a predetermined width by heating and pressing the backside resin layer to laminate and integrate the backside resin layer over the entire backside of the fiber base cloth having a predetermined width; A second step in which a front-side resin layer wider than the back-side resin layer is disposed on the surface of the fiber base fabric of the one-area layer sheet obtained in one step in such a manner that both side edges thereof protrude, is heated and pressed, and is laminated and integrated. And a method for manufacturing a waterproof sheet. 4. In the first step, after laminating and integrating the fiber base fabric and the backside resin layer, both edge portions thereof are cut at right angles to the sheet surface to form a one-area layer sheet having a predetermined width. Item 4. The method for producing a waterproof sheet according to Item 3.