JPH0431370Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention can be used as construction materials (for example, concrete casting frame plates, face plates, floor plates, wall plates of simple assembly houses), inner wall plates of freezing rooms, etc. This relates to the plate materials that are used.

(Prior Art) As this type of board material, there is one in which the surface of the core board is covered with a synthetic resin outer skin in order to provide cushioning properties and make the appearance beautiful. In particular, in order to improve waterproofness, a core plate a as shown in FIGS. 10 to 13 is used.
Plate material c whose entire surface is covered with synthetic resin outer skin b
has already been provided and used. Synthetic resin outer skin b
As shown in the figure, the entire surface of the core plate a is coated almost uniformly with a thickness of about 1 mm.

(Problems to be Solved by the Invention) The synthetic resin outer skin b is made of polyethylene, polypropylene, polyvinyl chloride, etc., and can provide appropriate cushioning properties to the core plate a and protect it from water. However, when handling board c, it is easy to receive concentrated external force at edge angle d and corner e due to collision or contact with other objects, but since synthetic resin outer skin b does not have sufficient wall thickness, core board a It is very easily compressed and cut between the edge angle f and the angle g, and the
As shown in Figure 13, it is crushed,
Abrasion and tearing often occur, and the core plate a is exposed at an early stage, and at the same time, the edge angle f and corner g of the core plate a are also crushed. This not only impairs the appearance, but also impairs the waterproof protection of the core plate a, making it impossible to extend the durability as much as desired. In particular, when used for concrete pouring, concrete leaks from the depressions caused by the crushing and convexities are formed on the concrete surface, making it unusable in a short period of time.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a board material in which the surface of the core board is covered with a synthetic resin outer skin.
It is characterized in that the wall thickness of the end face covering part that covers the four circumferential end faces of the core plate of the synthetic resin outer skin is made sufficiently larger than the wall thickness of the front and back face covering parts that cover the front and back surfaces of the core board. be.

(Function) The synthetic resin outer skin covering the core board can make the core board waterproof, protect the core board surface by providing cushioning properties, and can also make the core board look beautiful. In particular, the synthetic resin outer skin surrounds the four circumferential end faces of the core board with thick end face covering parts, and the thick parts form the edge angles and corner angles of the board material, so even if concentrated external force acts, the edge of the core board It has sufficient elasticity between the corners and corners to disperse and absorb external forces, ensuring the durability of the synthetic resin skin itself and sufficient protection of the weak edges and corners of the core board. .

(Embodiment) In a first embodiment of the present invention shown in FIGS. 1 to 5, plywood is used as the core board 1, and the entire surface thereof is coated with a synthetic resin outer skin 2 to form a board material A. The wall thickness t1 of the end surface covering portion 2a that covers the four circumferential end surfaces of the core plate 1 of the synthetic resin outer skin 2 is the thickness of the front and back surface covering portion 2b that covers the front and back surfaces of the core plate 1 of the synthetic resin outer skin 2. It is made sufficiently larger than t2. Normally t2 is set around 1mm, while t1 is set from 3mm.
It is preferable to set it to about 10 mm. However, it is not necessarily limited to this.

The synthetic resin outer skin 2 is formed by integrally joining a cylindrical surrounding wall 2c formed by extrusion molding on the circumferential surface of the core board 1, including the front and back surfaces and the side end faces, and end walls 2d previously molded and fitted to both end faces of the core board 1, but other methods can also be used. If the end walls 2d are made of the same synthetic resin as the cylindrical surrounding wall 2c and are attached to the end faces of the core board 1 in advance,
During extrusion molding of the cylindrical surrounding wall 2c, the resin melts and becomes integrated with the cylindrical surrounding wall 2c that is being formed, strengthening the bond between the two.

The end wall 2d is temporarily assembled to the end of the core plate 1 using its U-shaped cross section 2e, so that it can be easily extruded into the cylindrical surrounding wall 2c.
The end wall 2d may also be box-shaped as shown in FIG.

The synthetic resin outer skin 2 is preferably made of synthetic resin such as polyethylene, polypropylene, polyvinyl chloride, or synthetic rubber, and can airtightly cover the entire surface of the core board 1 to provide waterproof protection and prevent corrosion of the core board 1. It is possible to provide cushioning properties to the entire surface of the core board 1 to buffer and absorb external forces acting during transportation or other handling, and to protect weak edges and corners of the core board 1 from external forces. Furthermore, the synthetic resin outer skin 2 serves as a surface decoration material for the core board 1.

In particular, the end face covering part 2a of the synthetic resin outer skin 2 surrounds the four circumferential end faces of the core board 1 with a sufficient wall thickness and forms the edge angle A1 and corner angle A2 of the plate material A, and concentrated external force is applied to these parts. Even if the external force is applied, sufficient elastic action can be exerted between the edge angle 1a and the corner angle 1b of the core plate 1, and the external force can be well dispersed and absorbed.
The synthetic resin outer skin 2 itself is not easily crushed or torn to expose the core board 1 unlike in the conventional case, and the edge angles 1a and 1b of the core board 1 are not crushed. Therefore, the durability of the synthetic resin outer skin 2 and the protection of the core plate 1 by the synthetic resin outer skin 2 are improved.

Note that the edge angles 1a and 1b of the core plate 1 are chamfered because they exert a concentrated reaction force on the synthetic resin outer skin 2 when an external force acts on the edge angles A1 and A2 formed by the synthetic resin outer skin 2. It is advantageous to form it on a curved or rounded surface.

The stepped portion 1c formed at the end wall 2d of the core plate 1 and the fitting portion includes an end surface covering portion 2a, which is a thick portion of the synthetic resin outer skin 2, and a front and back surface covering portion 2b, which is a thin portion.
This improves the shear strength at the interface between the

In this sense, it is advantageous to form a stepped portion 1c also on the side end face of the core plate 1, as in the second embodiment shown in FIG. Note that the core plate 1 is a particle plate.

8 and 9 show the end wall 2d on the end surface of plate material A.
This shows the case where fitting protrusions 2e and 2f and fitting concave shapes 2g are formed with the cross-sectional shapes of. These can also be formed on the side end surfaces of the plate material A.

(Effects of the invention) According to the invention, the synthetic resin outer skin that coats the surface of the core board surrounds the four circumferential end faces of the core board with thick parts to reduce the corner angles of the edges of the board where concentrated external forces tend to act. The core board is not easily exposed or crushed, so it improves the durability of the board and is suitable for concrete pouring. It can also be used for a long time.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view showing the first embodiment of the present invention, Fig. 2 is a plan view with a portion of the synthetic resin outer skin removed, and Fig. 3 is a vertical sectional view. , 4th
The figure is a cross-sectional view, FIG. 5 is a perspective view of the end wall, FIG. 6 is a perspective view showing another example of the end wall, FIG. 7 is a partial cross-sectional view of the second embodiment, and FIG. 8 , Figure 9 shows the third and fourth
A partial vertical sectional view of each embodiment, FIG. 10 is a perspective view of a conventional example with a portion cut away, FIG. 11 is a plan view of FIG. 10, and FIGS. It is a partially enlarged perspective view. A...Plate material, 1... Core plate, 2... Synthetic resin outer skin, 2a... End face covering part, 2b... Front and back surface covering part, t1, t2... Wall thickness.

Claims (1)

[Scope of utility model registration request] In a board material whose surface of the core board is covered with a synthetic resin outer skin, the wall thickness of the end face covering part that covers the four circumferential end faces of the core board of the synthetic resin outer skin is the thickness of the front and back face covering parts that cover the front and back surfaces of the core board. A board material that is characterized by being sufficiently larger than its wall thickness.