JPS62218101A - Roof board flitch and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a field plywood used as a base material for roofing materials in houses and a method for manufacturing the same.

[Prior art and its problems]

Generally, plywood was used as roof material, but this plywood has a nearly smooth surface and is installed by nailing onto the roof structure base material.

Due to the sloped surface, the plywood surface was very easy to slide, and there was a risk of falling due to slipping when plywood was installed, or when waterproofing materials such as asfa, Stoffelt, and roofing were installed on the plywood surface.

[Means for Solving the Problems and Their Effects] In order to solve the above-mentioned problems, the present invention provides sliding recesses on the surface of the plywood during the hot pressing process.

By adopting such a configuration, the present invention provides field plywood provided with four anti-slip rivers without complicating the manufacturing process in particular.

[Explanation of Examples]

Examples of the present invention will be described below.

For convenience of explanation, first, the manufacturing method of the field plywood of the present invention will be explained.

First, a plurality of sheets of high moisture content, low quality (0.5 to 5 cm thick) obtained by a conventional method are laminated together while applying an adhesive using an adhesive coating device such as a spreader.

The veneers used may be either hardwood veneers or softwood veneers, or they may be used in combination, with the fibers of multiple veneers being perpendicular or in the same direction. Stack.

After lamination, at least one side of the hot plate is inserted into a hot press 3 equipped with a mesh 2 attached to the surface and bonded under heat and pressure.

The mesh 2 is preferably made of metal, preferably stainless steel6, or may be made of heat-resistant synthetic resin.

Further, it is necessary to use a material whose porosity is 50% or more. If the porosity is 50% or more, the contact area with the surface of the veneer during hot pressing is large, making it difficult to form four parts, and it is necessary to press with more pressure than necessary.

Further, among the plurality of veneers to be laminated, at least the veneer l which is in contact with the hot plate to which the net-like material is attached has a moisture content of 10% or more and a specific gravity of 0.5 or less.

In addition, since the veneer is heated and pressurized with the mesh 2 in between, the water vapor in the veneer is released through the gap between the mesh and the hot plate, so punctures do not occur even when the veneer has a high moisture content.

If the moisture content of this veneer is 10% or more, the heat pressure II! ?
The wood is not softened by cellulose, etc. due to the heat of heat, and the wood quality is destroyed by the mesh during hot pressing, resulting in a decrease in strength and the formation of hangnails on the surface, resulting in a decline in product quality.

Moreover, if the specific gravity is 0.5 or more, it will be difficult to be hot-pressed and will be easily restored after hot-pressing, resulting in shallow grooves.

Instead of the net-like material, an embossed plate having a mesh pattern-like unevenness on its surface may be attached to a hot press by hot pressing.

Thus, a field plywood whose surface was provided with recesses for slipping in a mesh pattern was obtained by heat-pressure bonding.

〔Effect of the invention〕

(Since four parts are provided on the surface of plywood a, the anti-slip effect is improved.

) Since there are four parts on the surface of plywood a, it is considered a waterproof material.

An air layer is formed between the two, and this air layer increases or decreases the heat retention effect.

(When using the Φ mesh material 2, punctures do not occur during f!I! pressure, and a high ice content veneer can be used.

[Brief explanation of drawings]

The drawings are skeleton diagrams of the field plywood manufacturing equipment of the present invention; l2 plywood 2: Net-like material 3: Hot press a: Plywood.

Claims (5)

[Claims] (1) Field plywood characterized by having mesh-like anti-slip recesses on the surface of the plywood. (2) After laminating multiple high ice content veneers with adhesive, inserting them into a hot press with a mesh between the hot plates,
A method for producing field plywood, which comprises hot-pressing a plywood whose surface is provided with recesses for smoothing in a mesh pattern made of a net-like material. (3) Using a mesh material with a porosity of 50% or more, A method for manufacturing field plywood according to claim 2. (4) The method for producing field plywood according to claim 2, wherein at least the veneer in contact with the net-like material has a moisture content of 10% or more among the plurality of laminated veneers. (5) The method for manufacturing field plywood according to claim 1, wherein the specific gravity of at least one of the laminated veneers in contact with the net-like material is 0.5 or less.