JPH0762789A - Ceiling plate - Google Patents

Abstract

PURPOSE:To improve the working efficiency by constituting a reverse crosspiece joined with the reverse surface of a base plate, from a molded member which has each hardened layer on the obverse and reverse surfaces of a molded body made of the porous synthetic resin and constituting the hardened layer from a joint body consisting of the molded members which are positioned lengthwise and crosswise. CONSTITUTION:A longitudinal crosspiece is formed by joining a molded member 9 which is made of the porous synthetic resin and has each hardened layer 8 in the upper and lower parts and an inner member 7 which is formed by joining a molded member 10 having each hardened layer 8 on the left and right sides, by an adhesive. Further, a lateral crosspiece 4 is formed by using a molded member having each hardened layer on the left and right sides. On the reverse surface of a base plate 2, the longitudinal crosspiece and the lateral crosspiece 4 are joined. Further, a ceiling plate is formed by attaching a printed decoration paper sheet 1 having a wooden design, on the decoration surface of the base plate 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling plate which belongs to the field of structural elements and building materials.

[0002]

2. Description of the Related Art A conventional ceiling board is formed by joining a back rail consisting of a ladder-shaped vertical rail and a horizontal rail to the back surface of a base plate, but the whole is made of a narrow vertically long wood material. Therefore, its weight lowers the workability at the time of constructing the ceiling, and has reached the limit in terms of cost reduction. On the other hand, the depletion of forest resources has been called for, and the supply of timber has been halted, and there is a pressing need for further utilization of timber resources. Under these circumstances, the development of ceiling panels made of new materials that are lightweight and easy to handle is being demanded.

[0003]

The problem to be solved by the present invention is to achieve the object by providing a lightweight and inexpensive ceiling board made of a porous synthetic resin molding material.

[0004]

The ceiling board of the present invention is a ceiling board formed by joining a base plate to a back rail and attaching a sheet material having a wood pattern to the base board. It is composed of a molding material in which a hardened layer is formed on the front and back sides of a molded body of porous synthetic resin, and a back rail is a constituent member of a combination of molding materials in which the hardened layer is positioned vertically and horizontally.

[0005]

The vertical arrangement of the hardened layer enhances the bending strength.

[0006]

EXAMPLES The present invention will be described by way of examples. As shown in FIG. 1, a base plate 2 made of a porous synthetic resin material or veneer plywood having a decorative face coated with a printed decorative paper 1 as a sheet material, and a base plate. In the ceiling plate in which the vertical rails 3 and the horizontal rails 4 joined to the back surface of the back rail 2 are formed by the back rails 5 made of a porous synthetic resin material, the vertical rails 3 and the side members 6 as shown in FIG. The side member 6 is a molding material 9 in which a hardened layer 8 is formed on the upper and lower sides as shown in FIG. 3, and the inner member 7 is a hardened layer on the left and right sides as shown in FIG. 8 is formed by joining three molding materials 10 with three adhesives.

Here, as for the inner member 7, a hardened layer 8 having a depth S is simply formed vertically as shown in FIG. 3 and a hardened layer 8 having a depth S is formed laterally as shown in FIG. Comparing the three molded materials 10 joined together, the two sections have the same cross section except for the hardened layer 8 and therefore have the same section modulus and the same bending strength in the vertical direction.

Therefore, comparing only the hardened layer 8,
In the former one shown in FIG. 3, the cross sections of the upper and lower hardened layers 8 are involved in the bending strength, and the section modulus Z ₁ is Z ₁ = 1.4.
hs ^2/6, and the because will correspond to the vertical bending moments, the section modulus Z _1T of total Z _1T = 2 × 1.4
hs ² /6=1.4hs ^2/3 becomes ...... (1).

Next, the latter one shown in FIG. 4 is formed by joining three molding materials 10, and the hardened layers 8 formed on the left and right of each molding material 10 contribute to the bending strength. section modulus Z ₂ of the hardened layer 8 is Z ^₂ = sh _2/6, the section modulus of the total Z _2T is ^{_{Z 2T = 6 × sh 2/}} 6 = sh 2 ······
(2)

[0010] Comparing the section modulus involved in the longitudinal direction of the bending strength of the vertical bars 3 between them, (1) and ^{_{(2), Z 2T -Z 1T = sh 2}} -1.4hs 2/3 = sh (H-
1.4s / 3) Here, since s is a very thin layer compared to h (h-
1.4s / 3)> o. Therefore, Z _2T −Z _1T > o ∴ Z _2T > Z _1T .

Therefore, in the same cross section, as shown in FIG. 4, three molding materials 10 each having a hardened layer 8 formed on the left and right sides are joined together to form an inner member 7, and a lateral member having a hardened layer 8 formed on the upper and lower sides thereof. By using the vertical crosspiece 3 to which 6 is joined, it is possible to provide a ceiling plate made of a lightweight material of porous synthetic resin with a strength that does not hinder transportation or mounting. Even in the cross rail 4, the bending strength in the lateral direction can be increased by using the molding material 10 having the hardened layers 8 formed on the left and right. In addition, since the molding material 10 is porous in the vertical direction, after the wooden ceiling plate is used to apply the ceiling to the ceiling, the shadow of the horizontal crosspiece that gradually appears on the ceiling plate due to the porous air permeability after a lapse of months. Can be suppressed. What is the above shadow? If the horizontal rail is in contact with the back surface of the ceiling board, the portion where the horizontal rail located in the direction perpendicular to the grain or grain direction of the ceiling board is in contact, regardless of the color of the entire surface of the ceiling board. It is a phenomenon that the surface of the ceiling plate does not discolor, which is attributed to ventilation.

[0012]

According to the ceiling board of the present invention, since it is light in weight and has sufficient bending strength, the work efficiency of the ceiling construction is improved, and the horizontal rail is brought into close contact with the back surface of the ceiling board, and the shadow rail is attached to the front surface. There is an effect that does not come out.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining a state in which a part of a ceiling plate according to the present invention in a longitudinal direction is omitted and a base plate 2 is broken.

2 is an enlarged sectional view taken along the line AA of FIG.

FIG. 3 is an explanatory view of a state in which a hardened layer 8 of an inner member 7 is formed vertically.

FIG. 4 is an explanatory view of a state in which a hardened layer 8 of an inner member 7 is vertically formed on the left and right.

[Explanation of symbols]

 1 Printing decorative paper 2 Base plate 3 Vertical bar 4 Horizontal bar 5 Back bar 6 Side member 7 Inner member 8 Curing layer 9 Molding material 10 Molding material

Claims (2)

[Claims] 1. A ceiling board formed by sticking a wood-like sheet material to the surface of a base plate having a back rail joined to the back surface, wherein the back rail has hardened layers formed on the front and back sides of a porous synthetic resin molded body. A ceiling board, which is made of a molding material and whose back rail is made up of a combination of molding materials in which the above-mentioned hardened layer is positioned vertically and horizontally as a constituent member to enhance the bending strength of a lightweight member. 2. The ceiling plate according to claim 1, wherein the left and right vertical rails of the back rail are made of a combined body.