Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Nonwoven fabric – Including an additional nonwoven fabric
Patent
1996-08-07
2000-05-30
Cole, Elizabeth M.
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Nonwoven fabric
Including an additional nonwoven fabric
442386, 442394, 442412, 428912, B32B 2712
Patent
active
060690984
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND ART
Generally, when making the outer walls 1 of a building such as a house out of mortar walls, water-resistant asphalt-impregnated paper 3 is first attached over the substrate 2 of the building by means of staples 4, lath 5 is attached to that surface by means of staples 4, then undercoat mortar 6 and overcoat mortar 7 are coated in order to finish, as shown in FIG. 4.
In this case, when the overcoat mortar 7 is coated directly after the undercoat mortar 6 has been coated during finishing by coating with the overcoat mortar 7, there is the risk that the undercoat mortar 6 could crumble away under its own weight. Therefore, conventionally, the undercoat mortar 6 is cured to harden, then the surface of the undercoat mortar 6 is rinsed with water before the overcoat mortar 7 is coated for finishing.
However, with the above-mentioned installation procedure, there is a problem in that the installation work can become prolonged since the installation work must be halted for curing after the undercoat mortar 6 has been coated. Furthermore, the addition of more water than is required (surplus water) for a cement hydration reaction to the mortar 6, 7 for the purposes of contributing spreadability to the mortar 6, 7 and increasing the workability during coating also causes prolongation of the curing time.
On the other hand, during the summertime, direct exposure to sunlight of the mortar 6, 7 during curing often causes a dry-out phenomenon wherein the surface of the mortar 6, 7 dries too quickly and forms cracks.
Additionally, when the undercoat mortar 6 is coated onto an asphalt impregnated paper 3, water from the undercoat mortar 6 often moistens the substrate 2 by seeping through the holes of the staples 4, therefore running the risk of causing corrosion or the like.
Furthermore, there is the problem that the asphalt impregnated paper 3 is low in strength, so that it is easily torn during the installation work and can result in the generation of cracks in the outer wall 1 after installation, or make the mortar more prone to crumbling due to earthquakes or the like.
DISCLOSURE OF THE INVENTION
The present invention was made under consideration of the above-mentioned conditions, and has the object of offering a mortar substrate sheet which allows extremely simple installation work without creating problems such as crack formation, mortar crumbling, dry-out phenomena or substrate corrosion, and is also exceptionally strong.
That is, the present invention is a mortar substrate sheet, for placement between a substrate and mortar to be coated during installation of mortar to an outer wall of a building such as a house; characterized in that a water absorption/retention sheet having water absorbent and water retentive properties is layered onto the mortar side of a water-resistant/moisture-permeable sheet having water-resistant and moisture permeable properties. In this case, the above-mentioned water-resistant/moisture-permeable sheet should preferably comprise an unwoven fabric layer; and a resin layer, having elasticity, which is layered onto the surface on the substrate side of this unwoven fabric layer.
Additionally, a coating layer, which does not easily dissolve in water and dissolves in a strongly alkaline solution, may be formed on the surface of said water absorption/retention sheet.
In this case, a product obtained by adding polyvinyl alcohol to a co-polymer of polyvinyl acetate and acrylic acid, can be used in said coating layer.
Furthermore, wax can be added to the coating layer, or the surface can be coated with water repellent agent or the like, so as to contribute a water repellent property to the surface for a designated period of time.
Moreover, a reinforcement sheet which contributes a designated strength to the mortar substrate sheet can be layered onto the surface on the mortar side.
Also, at least one type of material selected from among paper, unwoven fabric, and woven fabric can be used in said water absorption/retention sheet.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sect
Koutani Eiji
Otsuka Morihisa
Shimizu Yutaka
Ueda Yoshimi
Cole Elizabeth M.
Fukuvi Chemical Industry Co., Ltd.
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