JPH02245301A - Reinforced veneer, plywood and laminated lumber - Google Patents

Abstract

PURPOSE:To obtain reinforced veneer, plywood and laminated lumber as ultrahigh strength material, the shear stress of which is large and the tensile strength of which is high, by a method wherein glass fiber board, glass fiber fabric or glass fiber is pasted by adhesive to wood veneer, plywood or laminated lumber so as to be made into an integral body. CONSTITUTION:Reinforced plywood is produced by pasting glass fiber board 2, which is arranged between wood veneers 1 or between the face layer and back layer of plywood, as reinforcement by adhesive 3. As the reinforcing material, glass or glass fiber fabric can be used in addition to the glass fiber board 2. Further, wood veneer 1 can be arranged to odd-numbered layers or the face layer, back layer and core layers of the plywood, while glass fiber boards 2 can be arranged to all the even-numbered layers of the plywood so as to product integral plywood. Since the glass fiber board is pasted by adhesive to the reinforced veneer, plywood and laminated lumber, the resultant material has large tensile strength, which is characteristic to glass fiber, and high heat retaining properties, withstands high temperature, retards fire, elongates little and is excellent in heat and acoustic insulating properties.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to reinforced veneer plywood and laminated wood.

[Conventional technology and its technical challenges] Plywood is generally used for industrial purposes not only because it has a high strength relative to its weight, but also because its dimensions are stable and long and wide boards can be obtained at low cost. It is also widely used as a material.

However, the plywood produced in Japan is mainly made of South Sea wood such as Avitone, Kapor, and Lauan, and such plywood is used as load-bearing materials for container floors, tankers, and tank support members on land. In some cases, the joints located in even-numbered layers of plywood whose fiber direction is parallel to the joists supporting the plywood may be destroyed, which has been a problem.

This is because when cargo or other heavy objects are loaded on plywood, compressive and tensile stresses are generated on the front and back surfaces of the plywood, respectively, and shearing stress is generated on the middle layer.

In this case, before the back layer of the plywood is destroyed by tensile stress or the like, the middle layer of the plywood is destroyed by shearing force at its back crack. To improve this, it is possible to increase the thickness of the plywood or increase the shear stress of the combination, but increasing the thickness of the plywood is uneconomical and increases the weight of the flooring material. When used as the transportation equipment, there are certain limits.

On the other hand, in order to increase the shear stress during bonding, a thermosetting 11a adhesive is applied to the back side of the plywood or the veneer is made by impregnating the veneer with a thermosetting resin liquid and hardening it. Plywood using veneer without cracks is known, but such plywood requires coating the veneer with resin or the like and then curing it, making the process complicated and expensive.

The present invention solves the problems of the prior art, takes advantage of the advantages of wood, and provides reinforced veneer 9 plywood and laminated wood as super-strength materials that are relatively inexpensive and have large shear stress and high tensile strength. With the goal.

[Means for Solving the Problems] The present invention is a method in which a glass fiber board is integrally bonded to two veneers, two plywood boards, or a laminated wood board using an adhesive.

[Example] Fig. 1 shows a cross-sectional view of a reinforced plywood according to the present invention, in which a wooden veneer 1 is used as the front and back plates of the plywood, and a glass fiber board 2 arranged as an interlayer between them is pasted together with an adhesive 3. It has become.

Fibers or fabrics similar to glass fibers can be used for the glass fiber board 2 as an additive.

The drawing shows the case where the glass fiber board 2 is placed between two veneers, but the wooden veneer l is placed on the front and back surfaces of the plywood and in the number of layers constituting the plywood, while the glass fiber board 2 is placed between the two veneers. 2 can also be added to all even-numbered layers and integrated.

FIG. 2 shows a cross-sectional view of a reinforced veneer according to the present invention, in which a glass fiber board 2 is bonded to the back surface of a wooden veneer 1 with an adhesive 3 and integrated.

FIG. 3 shows a cross-sectional view of a square timber as a reinforced laminated timber according to the present invention.
are arranged and bonded together with adhesive 3.

[Effects of the Invention] Since the present invention is made by bonding a glass fiber board to two veneer-reinforced plywood and laminated wood with an adhesive, the glass fiber has high tensile strength, high heat retention,
Because it can withstand high temperatures and does not burn, does not stretch easily, and has excellent heat and sound insulation properties, it can be used as a wall material for building materials, flame retardant, and as a wall material for food coolers, greenhouses, and refrigerated cars, as well as containers.
It can be effectively used as floorboards for truck beds, etc., tankers, tank support members on land, etc., and can be produced in a simpler manufacturing process than plywood made of resin-treated veneers or the like.

1...Single board 2...Glass fiber board 3...Adhesive

Claims (1)

[Scope of Claims] Reinforced veneer, plywood, and laminated wood characterized by integrating a glass fiber board with a wooden veneer, plywood, or laminated wood using an adhesive.