JPH0410543B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing exterior materials for buildings, which are mainly used as roofing materials and exterior wall materials for storage buildings, etc. The present invention provides a method for obtaining a building exterior material comprising a substrate and a synthetic resin foam integrally molded on the back surface of the substrate.

(Prior Art) As building exterior materials used mainly as roofing materials and exterior wall materials for storage buildings, etc., there are those with a laminated structure in which a synthetic resin foam is laminated on a substrate of building exterior materials. It is widely used because it has heat insulating and sound absorbing properties.

Incidentally, the building exterior material having a laminated structure of the substrate and the synthetic resin foam is one in which a large number of these sheets are pasted together to form a roof, an exterior wall, etc.
In this case, in order to prevent rainwater etc. from entering through the bonded parts, each exterior material is pasted together so that the pasted parts form an overlapping part, so the overlapped part consists only of the substrate. External building cladding materials shall be used.

However, for a building exterior material in which the overlapped portion is composed only of a substrate, there is a method in which a separate synthetic resin foam is attached to the substrate of the building exterior material, excluding the overlapped portion. It is generally manufactured by directly foaming a synthetic resin foam molding composition over the entire back surface of the substrate of a building exterior material, and then cutting and removing the foam in the overlapped area. It is.

(Problems to be Solved by the Invention) However, in the conventional method for manufacturing an exterior material for a building in which the overlapping portion is composed only of a substrate, the former method of attaching a synthetic resin foam is as follows: A separately manufactured synthetic resin foam is pasted onto the board, leaving some predetermined areas on the board.
The disadvantage is that the process is complicated, resulting in high costs, and the latter method of cutting and removing the foam in the overlap area not only requires a lot of effort to cut and remove the foam, but also cuts unnecessary parts. If the cutting and removal of the foam is incomplete and there are parts of the foam left behind, the overlapping parts of the exterior material will float,
This has disadvantages such as causing rain leakage.

(Means for Solving the Problems) The method for producing a building exterior material of the present invention is to directly foam a synthetic resin foam molding composition on the back side of a substrate of a building exterior material to form a building material. As a substrate to which a synthetic resin foam molding composition is applied, a mold release treatment is applied in advance to the back surface of the substrate in a portion corresponding to the overlapping margin in the obtained building exterior material. To easily and reliably obtain an exterior material for a building whose overlapping portion is composed only of a substrate by using a material that is

That is, the method for producing a building exterior material of the present invention includes a preliminary step of performing a mold release treatment on the back surface of the substrate in a portion corresponding to the overlapping margin in the obtained building exterior material, and a step of applying a synthetic resin to the back surface of the substrate. After applying a composition for molding a foam, foaming and curing it to obtain an integrally molded body of the substrate and the synthetic resin foam, the part subjected to the mold release treatment in the previous step. After cutting and removing the synthetic resin foam formed on the back surface of the substrate, or applying a molding composition for the synthetic resin foam on the back surface of the substrate,
The synthetic resin foam molding composition applied to the back surface of the substrate in the part subjected to the mold release treatment in the previous step is removed, and then the forming composition on the back surface of the substrate is foamed. , and a subsequent step of curing.

In the above-mentioned method of the present invention, the mold release treatment of the back surface of the substrate in the portion corresponding to the overlapping margin in the obtained exterior material for buildings can be performed by applying a mold release treatment agent such as silicone resin, fluorine resin, wax, oil, etc. Alternatively, this can be achieved by temporarily attaching masking tape.

Further, as a means for applying the composition for molding the synthetic resin foam onto the back surface of the substrate, appropriate means such as a spray method and a coater method are used.

Furthermore, in the latter step described above, before the molding composition for the synthetic resin foam coated on the back surface of the substrate is foamed and cured, a means for removing the uncured molding composition from the part to be released from the mold is provided. For example, unnecessary portions of the molding composition can be easily removed by a removal method using a squeeze bar, a suction nozzle, or the like.

In addition, the molding composition can be foamed without removing the molding composition of the synthetic resin foam applied to the back surface of the substrate in the part subjected to mold release treatment.
After curing, make a score line at the boundary of the overlap with a knife or mold blade, peel off the synthetic resin foam formed on the release surface, and remove the overlap that consists only of the substrate. It is something that forms.

(Example) Hereinafter, the specific structure of the method for manufacturing a building exterior material of the present invention will be described with reference to Examples.

Example 1 Using an FRP corrugated sheet manufactured as a roofing board as a substrate, wax was applied only to the overlapped portion on one side along the vertical and horizontal edges on the back side of the substrate, and the mold was released. Processed.

Next, a urethane resin was applied to the entire back surface of the substrate by a flow coater method, and then the urethane resin composition on the back surface of the substrate was foamed and cured to obtain an integrally molded body of the substrate and the synthetic resin foam.

Thereafter, a cut line is made with a knife from the urethane foam surface of the integrally molded body at the boundary of the vertical overlapping margin along the corrugation of the corrugated sheet serving as the substrate, and at the same time, a score line is made in the horizontal direction across the corrugated sheet. A score line was made at the boundary with a corrugated blade, and then the urethane foam on the release surface was peeled off.
The urethane foam was easily removed, and a building exterior material was obtained which was an integrally molded body of the urethane foam and the substrate, which had an overlapping margin and consisted only of the substrate.

(Effects of the Invention) The method for producing an exterior cladding material for a building according to the present invention is constructed as described above, and includes a substrate of the exterior cladding material for a building and a synthetic resin that is directly foam-molded on the back surface of the substrate. It has the function and effect that it is possible to easily and reliably obtain an exterior material for a building, which is made of an integrally molded body with a foamed material, and in which the overlapping portion of the exterior material is composed only of the substrate. .

Claims (1)

[Claims] 1. A building in which a molding composition for a synthetic resin foam is applied to the back side of a substrate of a building exterior material, and then foamed and cured to obtain an integrally molded body of the substrate and the synthetic resin foam. In the method for manufacturing exterior cladding materials for buildings, by using a substrate that has been previously subjected to mold release treatment on the back surface of the substrate in the portion corresponding to the overlapping margin in the resulting exterior cladding material for buildings, the overlapping margin portion is made only of the substrate. A method for manufacturing an exterior material for a building, characterized by obtaining an integrally molded body of a substrate and a synthetic resin foam.