JPH0216280A - Warping-proof wooden door - Google Patents

Abstract

PURPOSE:To prevent warping from being generated by bonding sawn plates on sections corresponding with rail sections after facing veneers are bonded on both surfaces of a plywood, and by bonding small end veneers on two or more surfaces at least at small ends on four peripheral surfaces. CONSTITUTION:Both the surfaces of a plywood 1 are coated with adhesives, and facing veneers 2 are heaped up, and are thermal-pressure-tightened to manufacture a both-surface facing plywood 2. Besides, a sawn oak member is cut off in specified dimension, and vertical rails 5 and horizontal rails 4 are manufactured. After that, on the four peripheral sides of the plywood 3, the vertical rails 5 and the horizontal rails 4 are arranged through both surfaces, and are bonded with adhesives. After that, on small end surfaces in the longitudinal direction, small end veneers 6 are bonded to manufacture a door. Then, sawn members for forming the rails 4, 5 are made thinner, and warping or out-of- order stress is reduced. Accordingly, the warping of the door or the like can be prevented from being generated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a wooden door that prevents warping by combining a plywood base material and sawn wood.

(Conventional Technology) Wooden doors currently on the market can be roughly divided into flush doors and solid wood doors.

The flush door is made of thin pieces of plywood, sawn wood, etc., and decorative plywood is pasted on both the front and back sides.

If necessary, add mirror plates, blood relations, etc. to create it.

On the other hand, a solid door is made of sawn wood with a head panel and frame material, which are then combined to form a door.

After construction, the door is attached to the frame material only with hinges and is left in an extremely free state, so there is no way to correct warpage or misalignment.

Even in rooms equipped with modern air-conditioning equipment, the environmental conditions (temperature, humidity, etc.) between one room, one room, and the hallway are different, so doors that exist at the boundary are exposed to extremely harsh conditions, causing them to warp or go awry. It is easy to occur.

For this reason, both conventional flush doors and solid wood doors unexpectedly warp or become distorted, and a perfect door has not yet been found.

(Problems to be Solved by the Invention) The present invention has a door that prevents warping due to a completely different structure, neither a conventional flush door nor a solid door, and the finished product is not a solid door. The object of the present invention is to provide a door that has an appearance similar to that of a conventional door, has an extremely heavy feel, is easy to manufacture, and can be produced in large quantities.

(Means for Solving the Problems) The warp-preventing door of the present invention is obtained by pasting decorative veneer on both sides of the plywood, then pasting a sawn board on the part corresponding to the frame, and It is characterized in that a small end veneer is attached to at least two of the end faces.

That is, as shown in Figure F51, the door of the present invention is made by pasting the decorative veneer 2 on both sides of a plywood l with a certain thickness to make a double-sided decorative plywood, and attaching a part of the frame member at the same time as the mirror plate. It was made integrally from two sheets of double-sided decorative plywood. Therefore, as shown in Figures 2 and 3, horizontal and vertical frames 4 and 5 made from sawn boards are pasted together on the part of the double-sided decorative plywood 3 that corresponds to the frame part to form the frame part. Form.

In the present invention, the plywood l may be cut to the same size as the product door from the beginning, or it may be made into double-sided decorative plywood 3 and then cut to match the dimensions of the product door.

The thickness of the plywood varies depending on the purpose, and in order to prevent warping, it is preferably at least 1/4 the thickness of the product door.

[Effect]

If the frame part is formed by sawing and sandwiching decorative plywood in this way, the warp will be extremely distorted or small. This may be seen as a simple inverse configuration of the ``Harkore'' plywood, but the content is completely different. In the case of lumber core plywood, the sawn wood, which easily warps, is thick, and the plywood, which does not warp easily, is thin, so there is no substantial improvement in warping.

Originally, plywood was made by laminating thin veneers alternately with the fiber directions perpendicular to each other, so it is difficult to get bent, or it is made of sheets of 2 to 31 m8, such as those used for flush doors. Thin plywood is not enough to prevent the door from warping. Point 1: The present invention was completed by focusing on the fact that warping and deformation are further reduced by using relatively thick plywood, preferably plywood with a door thickness of 174 mm or more.

On the other hand, according to No. 1], the sawn wood is about 1/3 thinner than the stile material of a normal solid door, so the stress caused by warping and warping is also small, making the combination of the two extremely stable.

Finally, on the small end surface, the laminated surface of plywood and sawn wood is exposed, so
It is necessary to finish at least two longitudinal sides by pasting small end veneers together.

The door created in this way looks exactly the same as a solid door, and has a heavy feel to it.

(Examples) Hereinafter, the present invention will be explained by examples, but the present invention is not limited thereto.

Example 1 Length C1+) 19801, width (u:l) 730mm
, 300g/m2 of melamine resin adhesive was applied to both sides of plywood with a thickness of l11111, and the same size of 0.6mm J'
G/I to lO at 120°C
12 and heat pressed for 3 minutes to create double-sided decorative plywood. Both sides of this decorative plywood were sanded and bound to a thickness of 12 mm.

On the other hand, planer sawn oak wood to a thickness of 12 mm and cut it to a specified size, for example 1980 x 125 cm.
1+X l 4) (7) Stiles, 480X 1
55mm (Bun gXJ12) and 480x 215+sm
(also 6 x l s) horizontal stile was created.

Vertical and horizontal frames are placed around the four sides of the double-sided decorative plywood from both sides,
8Kg/cm at room temperature with water-based vinyl urethane resin adhesive
``I pressed it for 2 hours to make it adhere.The amount of adhesive applied was 1 on each side.
50 g/m''.

The length of the oak on the small end face in the direction of the first child is 1980mm, and the width is 36cm.
, Attach the small end middle plate with a thickness of 2cm using hot melt resin, and! I created a door of 980x 734x 36■■.

Finally, urethane resin paint was applied three times using a spray paint to finish.

Example 2 Melamine resin adhesive was applied to both sides of 11 mm thick plywood for 30 minutes.
0g/1121 cloth, layered 0.6mm thick pine decorative veneer and heat pressed at 120℃ for 22 minutes at 10kg/■ to create double-sided decorative plywood.
7.5, and a urethane resin paint was applied using a roll coater or a flow coater to complete the coating.

On the other hand, sawn pine wood was planed to a thickness of 12 ml and cut into predetermined dimensions to create vertical and horizontal stiles. Furthermore, roll coater, flow coater, side roll coater
A urethane resin paint was applied using a paint finisher.

Vertical and horizontal frames are placed around the four sides of the double-sided decorative plywood from both sides,
8 g/cm at room temperature with water-based vinyl urethane resin adhesive
It was pressed and bonded for 22 hours. The amount of adhesive applied is 1 on each side.
50/112.

After applying urethane resin paint to a 21-thick small end veneer of pine using a roll coater, the frame material is pasted to the plywood.The small end of the door material in the longitudinal direction is coated with hot melt resin. A door with a thickness of 36 layers was created by gluing the veneers together.

In Example 2, the coating method is easier than in Example 1, and clay coating is possible.

(Effect of the invention) Each door of Example 1 and Example 2 was left with foam at the boundary between a room with air conditioning and a room without heating and cooling for three months, and the warpage in the width direction, longitudinal direction, and diagonal direction was measured. Both had Oss.

On the other hand, when a commercially available flush door and solid wood door were similarly installed and tested, warping of 3 to 5 III occurred and was found to be unsuitable.

In the J two-leg example, an example was shown in which the frame material was attached to the four sides of the double-sided decorative plywood, but the frame material may also be attached to the center of the door, or the thickness of the decorative plywood could be increased. By doing so, it is possible to increase the proportion of the frame material in the door surface.In the present invention, since the frame material is pasted on, it can be made thinner and thinner than conventional frame materials. It is also possible to create a door that is aesthetically pleasing.

As described above, the door of the present invention does not warp or go out of order, and it is possible to easily make a door that has a heavy feel that looks like solid wood.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of double-sided decorative plywood before lamination, and FIG. 2 is an exploded perspective view of an example of the door of the present invention. FIG. 3 is a perspective view of an example of the door of the present invention. In the diagram l...Plywood 2...Decorative veneer 3...Double-sided decorative plywood 4...Horizontal stile 5...Vertical stile 6...Small edge veneer

Claims (2)

[Claims] (1) After pasting decorative veneers on both sides of the plywood, sawn boards are pasted on the part corresponding to the frame, and small end veneers are pasted on at least two of the small end faces around the four sides. A wooden door that prevents warping. (2) A wooden door that prevents warpage according to claim 1, wherein the thickness of the plywood is 1/4 or more of the total thickness.