JPH0235476Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a waterproof sheet with a foam layer, specifically one that is laid on a base surface such as concrete or earth. This invention relates to a waterproof sheet with a foam layer, which prevents expansion of the waterproof sheet by removing air existing between the sheets to the outside, and which is improved so that grooves provided in the sheet are not closed after installation.

(Prior Art) Conventionally, in order to waterproof concrete structures, it has been widely practiced to lay a resin sheet such as a vulcanized rubber sheet or a resin sheet made of vinyl chloride on the base of a roof or the like. Various types of waterproof sheets have been proposed that have a structure in which a foam layer is laminated on a vinyl chloride resin sheet.

In addition, in order to actively release the air existing between the base and the sheet to the outside, it has been proposed that the foam layer has open cells, or that the foam layer is provided with communicating grooves. It is disclosed in Japanese Patent Application Laid-open No. 59-85060 or Japanese Patent Application Laid-open No. 54-9415.

(Problem to be solved by the invention) Such conventional waterproof sheets with foam layers do not release air, water vapor, etc. that is present between the base and the sheet to the outside through the open-cell foam layer or the continuous grooves. Ta.

However, the above-mentioned waterproof sheet has a two-layer structure consisting of a resin base material and a foam layer, and when it is compressed when laid on the base surface, it deforms significantly and the adhesive applied to the base surface adheres to the communication grooves. This is a major cause of the expansion of the air or water vapor present in the groove after construction, causing the sheet to swell.

The present invention aims to improve these problems, and in particular, increases the resilience of the tarpaulin sheet against compressive deformation, so that even after it is laid on a base surface coated with adhesive, even if it is subjected to compressive deformation. To provide a waterproof sheet with a foam layer which prevents the sheet from blistering by maintaining grooves that are always in communication and releasing air, water vapor, etc. contained between the base and the sheet to the outside.

(Means for solving the problem) That is, the present invention is characterized by interposing a fiber member having an opening area between a cushion layer consisting of a foam layer and a solid layer and a sheet-like base material, and A foamed material formed by providing grooves that are depressed at least in the opening area of the fiber member and communicating with the surface of the foam layer, and the solid layer of the other cushion layer is raised at least at the position where the fiber member is present so as to be brought into close contact with the foam layer. In a layered tarpaulin.

(Function) In the above-mentioned waterproof sheet with a foam layer, at least the cushion layer located in the opening area of the coarse fiber member is caused to sink, and air, water vapor, etc. existing between the base and the sheet are allowed to flow out onto its surface. The communication grooves are formed, and the numerous depressions formed in the areas where the cushion layer has sunk become areas where the foam layer deforms, making it easier for the waterproof sheet to be compressed and deformed, and increasing the rebound resilience of the deformed prevention sheet. . Therefore, even when a waterproof sheet is laid on a base surface coated with adhesive, the communicating grooves are not closed by the adhesive, and when the waterproof sheet is compressed and deformed, the foam layer itself adheres tightly within the recessed area. This makes it difficult for the adhesive to be taken in. Furthermore, the solid layer, which is greatly raised in the area where the warp and weft threads of the fiber member are present, especially at the intersections, restricts the compressive deformation of the waterproof sheet and prevents the adhesive applied to the underlying surface from adhering to the communication grooves. are doing.

Hereinafter, the waterproof sheet of the present invention will be explained in detail based on the accompanying drawings.

(Example) Fig. 1 is a partially cutaway perspective view of a waterproof sheet with a foam layer of the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is a cross-sectional view taken along line B-B in Fig. 1. , and FIG. 4 is a plan view of the foam layer in the waterproof sheet with a foam layer according to the present invention. It consists of a laminated structure formed from intervening fiber members 4.

The sheet-like base material 2 is made of weather-resistant thermoplastic resin such as polyvinyl chloride, ethylene vinyl acetate (EVA), or synthetic rubber, and has a thickness
It has a diameter of 0.2 to 2.0 mm.

Further, the cushion layer 3 is composed of two layers: a foam layer 5 located on the surface and a solid layer 6 located on the back surface.The foam layer 5 is made of polyvinyl chloride foam, polypropylene foam, polyethylene foam (especially It usually consists of closed cells such as cross-linked polyester foam), flexible polyurethane, urethane-vinyl acetate copolymer foam, etc., and has a foaming ratio of 1.5 to 50 times and has a diameter of 0.5 to 3.0 mm, while the solid layer 6 is made of the same material as the foam layer 5, and has a thickness of
It is within the range of 0.03-2.0mm. In the present invention, the material of the cushion layer 6 is preferably a polyvinyl chloride foam layer or a solid layer.

The fiber member 4 is a breaker or cloth made of coarse woven or knitted fabric, and is made of organic fibers such as polyester, polyamide, polyolefin, polyvinyl alcohol, aromatic polyamide, inorganic fibers such as glass fiber, stainless steel, etc. It is made of metal fiber and has an opening area of 40 to 98%, a mass of 20 to 600 g/m ² , and a tensile strength of 5 to 250 Kg/25 mm.

In the waterproof sheet having the above structure, the foam layer 5 constituting the cushion layer 3 has a recessed portion 10 sunken from the surface in the opening area 9 between the warp yarns 7 and the weft yarns 8 constituting the fiber member 4.
Moreover, the recesses 10 in which the respective opening areas 9 are formed are the largest. The foam layer 5 is attached to the solid layer 6 with a substantially uniform thickness.

On the other hand, the solid layer 6 constituting the cushion layer 3 has warp threads 7 and weft threads 8 as shown in FIG.
The sheet-like base material 2 and the foamed layer 5 are bonded together by entering the opening area where no foam exists. Further, the solid layer 6 is raised above the warp threads 7 and the weft threads 8 of the fiber member or at the intersection 12, and particularly above the intersection 12, the solid layer 6 protrudes the most. Therefore, even at the position where the weft yarn 8 is present as shown in FIG. 3, the area between the intersections 12 sinks to form a recessed portion 10. Similarly, at the position where the warp threads 7 are present, the solid layer 6 on the warp threads 7 between the intersections 12 is depressed.

A plurality of depressions 10 obtained in this way
are connected to each other to form a mesh-like communication groove 11, which allows air, water vapor, etc. existing between the base surface and the waterproof sheet to flow out to the outside, and the recessed portion 10 is raised. The cushion layer can be easily deformed and the rebound resilience can be improved. For this reason, even if the waterproof sheet laid on the base surface undergoes compressive deformation, the force separating it from the base surface is large and even the grooves to which the adhesive has adhered will not be easily closed.

Further, even when the waterproof sheet is compressed and deformed, the recessed portion 10 does not allow the adhesive to reach the bottom surface of the groove 11 in order to bring the foam layers 5 facing each other into close contact with each other within the recessed portion 10.

The waterproof sheet 1 with a foam layer is manufactured by first laminating a sheet-like solid layer 6 on the surface of the fiber material 4, and then
Next, a foamable sol is applied thereon and foamed, and then the sheet-like base material 2 is laminated on the surface of the fibrous material 4 in such a manner that it bridges with the solid interlayer 6.

(Effects of the invention) As described above, the waterproof sheet of the invention has the following features:
A plurality of depressions molded outside the area where the warp and weft of the fiber material intersect are connected to each other to form one continuous groove, which allows air, water vapor, etc. that exists between the base and the sheet to be removed from the outside. In addition, the plurality of recesses, especially the recesses formed in the opening area of the fiber member, become deformation areas of the foam layer, facilitating compressive deformation of the waterproof sheet and increasing rebound resilience. For,
Even if the waterproof sheet is laid on the base surface, the connected grooves will not close easily, and when the waterproof sheet is compressed and deformed, the foam layer will come into close contact within the recessed area, so the adhesive will not be taken up to the bottom of the groove. This makes it possible to maintain continuous grooves at all times. and,
Since the solid layer is especially raised in the area where the warp and weft of the fiber member intersect, the solid layer regulates the amount of compressive deformation of the waterproof sheet, allowing the adhesive applied to the underlying surface to enter the communication groove. This has the effect of maintaining continuous grooves and preventing the sheet from blistering even after it is laid on a base coated with adhesive.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of a waterproof sheet with a foam layer according to the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, Fig. 3 is a cross-sectional view taken along line B-B in Fig. 1, and Fig. 4 is a cross-sectional view taken along line A-A in Fig. 1. FIG. 1 is a plan view of a foam layer in a waterproof sheet with a foam layer according to the present invention. DESCRIPTION OF SYMBOLS 1... Waterproof sheet with foam layer, 2... Sheet-like base material, 3... Cushion layer, 4... Fibrous member, 5
... Foam layer, 6 ... Solid layer, 9 ... Opening area, 10 ... Recessed part, 11 ... Communication groove.

Claims (1)

[Claims for Utility Model Registration] 1. A fiber member having an opening area is interposed between a cushion layer consisting of a foam layer and a solid layer and a sheet-like base material, and the cushion layer is made to sink at least in the opening area of the fiber member. A waterproof sheet with a foam layer, characterized in that grooves are provided in the surface of the foam layer to communicate with each other, and the solid layer is raised at least in the area where each thread of the fiber member intersects, so as to be in close contact with the foam layer. 2. A waterproof sheet with a foam layer according to claim 1, wherein the foam layer in the cushion layer is attached to the solid layer with a uniform thickness.