JPS6047087B2 - Manufacturing method of waterproof sheet for construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a waterproof sheet for construction such as a roof base material, a wall base material, etc., and particularly to an improvement of a fiber-reinforced waterproof sheet with a cross core sheet interposed therebetween.

A fiber-reinforced waterproof sheet in which a cloth core sheet is interposed within the waterproof sheet, in which the cross core sheet is woven, is bound to stretch to some extent under tensile force. In addition, when the waterproof sheet is woven, it tends to bend at the bent portion where the warp intersects with the weft when the waterproof sheet contracts (shrinks in the length direction as it is gradually cooled after passing through heating rolls in the manufacturing process).

Note that there is a surplus laminate yarn in which a warp group is stacked on top and bottom (both front and back sides) of a weft array group, and a laminate material is layered on this warp and warp layer.

(Unexamined Japanese Patent Publication No. 49-9236). However, the warp and warp threads of the above laminate sheet sandwich the weft from both sides (front and back), but the upper and lower warp threads are shifted in position relative to each other, causing wavy bends in not only the weft threads but also the warp threads, resulting in poor dimensional stability. .

This invention solves the above-mentioned problems of fiber-reinforced waterproof sheets, and its purpose is to create a non-stretchable waterproof sheet by changing the structure of the cloth core. This invention is characterized in that the cross core sheet is made by sandwiching the weft yarn between two opposing warp yarns, upper and lower, and hardening them with a binder, and that synthetic resin sheets are superimposed on both sides of this cross core sheet and heated to integrate them.

Examples of the present invention will be described below with reference to the accompanying drawings.
A is a cloth core sheet, and B-1 and B-2 are soft or semi-hard synthetic resin sheets which are laminated on both sides of the cloth core sheet and pressed with a heating roll to be integrated. The cross core sheet A consists of a warp 1 and a weft 2. The warp 1 is made of two upper and lower yarns facing each other, and the weft 2 is sandwiched between them and hardened with a binder 3.
A large amount of this binder adheres to the intersection of the warp and weft due to capillary action.

The table below shows a comparison of expansion and contraction between the waterproof sheet obtained by the present invention and the conventional J waterproof sheet.

The test method was based on J15A6008-9, and a sample (thickness 2, Omlm, width 30m'm), length 300mIm) was collected.

The fibers of the cloth core sheet were made of nylon for the warp and glass fiber for the weft, the thickness of both fibers was 120 denier, and the number of warp and weft per inch was about 15 to 20.

The sample was heated to 80℃± while attached to a gear type aging tester.
After being left in a laboratory at 2°C for 2 hours, it was taken out to a room at room temperature (20°C), and after being left for 1 hour, the longitudinal and lateral expansion and contraction were measured.

This invention is as described above, and the manufacturing method of this architectural waterproof sheet is such that a cross core sheet has weft threads sandwiched between upper and lower two opposing warp threads and is fixed with a binder, and both sides of the core sheet are coated with synthetic resin. Since the sheets are stacked and heated to integrate, even if the sheet layers on both the front and back sides try to shrink, the weft of the cross-core sheet is sandwiched between the two opposing warps, so no wavy bends occur at the intersection. Also, the warp yarns are sandwiched between two weft yarns, and are slightly bent in a wavy manner at the sandwiched part, but since this bending is fixed with a binder, both the warp yarns and the warp yarns are difficult to bend, so the shrinkage of the tarpaulin sheet is smaller than that of conventional tarpaulin sheets. It has the effect of being significantly compressed and improving dimensional stability.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway perspective view of the manufacturing process of a waterproof sheet (before heat pressing), and FIG. 2 is an enlarged sectional view of a portion of the same product. A...Cross core sheet, 1...Warp, 2...Weft, 3...Binder, B-1, B-2...Synthetic resin sheet.

Claims (1)

[Claims] 1 A waterproof sheet for buildings in which synthetic resin sheets are superimposed and heated on both sides of a cross core sheet, and the cross core sheet is characterized in that the weft is sandwiched between two opposing warp yarns, upper and lower, and hardened with a binder. manufacturing method.