JP2704631B2 - Wooden door that prevents warpage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wooden door in which a plywood base material and a sawn timber are combined to prevent warpage.

[Conventional technology]

Wooden doors currently on the market can be broadly divided into flash doors and solid doors.

Flush doors are framed using plywood, sawn wood, and other small pieces, and laminated with decorative plywood from both front and back, and if necessary, with a mirror plate, face rim, etc.

On the other hand, a solid door is made of a mirror plate and a frame made of sawn wood, and these are combined to form a door.

The door is attached to the frame material only with a hinge, and is extremely free after the construction, so that the door has no action to correct warpage or irregularity.

Even in rooms equipped with modern air-conditioning equipment, the environmental conditions (temperature, humidity, etc.) between rooms and between rooms and between rooms and corridors are different.
Doors at the boundary are exposed to extremely severe conditions, and are liable to be warped and disordered.

For this reason, both the conventional flash door and the solid door are unexpectedly warped or distorted, and a perfect door has not been found.

[Problems to be solved by the invention]

The present invention is not a flash door as in the past,
Also, it is not a solid door, it is a door with a completely different structure to prevent warping and distortion, and the finished product has an appearance close to a solid door, it is extremely heavy, and the manufacturing method is easy and it is easy to produce To provide a system door.

[Means for solving the problem]

The door of the present invention that prevents warpage is a double-sided decorative plywood obtained by laminating two decorative plywoods each having a decorative veneer attached to a plywood, and a ground plate is attached to a portion corresponding to a frame portion of the double-sided decorative plywood, A small end veneer is adhered to at least two or more of the four small end surfaces.

That is, the door of the present invention is prepared by preparing two pieces of decorative plywood in which a decorative veneer is adhered to one side of a plywood, and bonding the decorative plywood so that the decorative surface is on the outside, and has a certain thickness. In addition, a double-sided decorative plywood is cut into a substantially same size as a door to form a door base material, and the door base material is made a part of a frame member together with a mirror plate. On the upper surface of the door base material, a grind plate is attached to a portion corresponding to the door frame to form a frame.

In the present invention, the double-sided decorative plywood serving as the door base material may be approximately the same size as the product door from the time of the decorative plywood before laminating, or may be formed into a predetermined size after forming the double-sided decorative plywood. You may cut it.

[Operation] When the frame portion is formed so as to sandwich the plywood with the ground plate, the warpage becomes extremely small. This may seem at first glance to be a mere reverse configuration of lumbar core plywood, but the content is completely different. In the case of lumber core plywood, the crushed plywood which is easy to get out of order is thick, and the plywood which is hard to get out of order is thin, so that there is no essential improvement against the out of order.

Originally, plywood is made of thin veneers alternately stacked so that their fiber directions are orthogonal to each other, so it is difficult to get out of order, but it is about 2-3 mm as used for flash doors Thin plywood is not enough to prevent the door from getting out of order.

In the conventional door, since the frame portion and the mirror plate are simply joined in combination, it is easy to cause a deviation due to either deviation, particularly due to the characteristics of the frame. In this respect, in the door of the present invention, the double-sided decorative plywood is integrated as a mirror plate and part of the frame at the same time. That is, the thickness of the double-faced decorative plywood is preferably set to 1/4 or more of the thickness of the door.

On the other hand, the sawn timber is about one-third thinner than a normal solid door frame, so the warping stress is reduced and the combination of the two is extremely stable.

As to bonding the double-sided decorative plywood with two decorative plywoods, a single decorative plywood may be used, but it is relatively easy to finish the single-sided decorative plywood by painting and bonding them together. Also, when sticking the two pieces, the pier, paper honeycomb, foam plastic sheet,
This is because it is possible to reduce the weight, to provide heat insulation, and to have a sound insulation / soundproof effect by interposing a vibration suppression / sound insulation sheet or the like.

Finally, since the laminated surface of the plywood and the ground plate is exposed on the small end surface, it is necessary to finish at least two longitudinal surfaces by bonding a small end veneer.

The door created in this manner is exactly the same as a solid door in appearance and has a sense of weight.

〔Example〕

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto.

Example 1 As shown in FIG. 1, length (l ₁ ) 1980, width (l ₃ ) 730 m
m, (l ₁ × l ₃ ), apply 5.5 g / m ² of melamine resin adhesive to plywood of 5.5 mm thickness, and overlay 0.6 mm thick veneer veneer 12
The decorative plywood 10 was obtained by hot pressing at 0 ° C. and 10 kg / m ² for 2 minutes. Further, two pieces of the decorative plywood were coated with an aqueous vinyl urethane resin adhesive at 180 g / m ² and pressed at room temperature at a pressure of 8 kg / cm ^{2 for} 2 hours to prepare a double-sided decorative plywood. This double-sided decorative plywood was sanded on both sides to a thickness of 12 mm.

On the other hand, oak sawn wood is planarized to a thickness of 12 mm, cut into predetermined dimensions, for example, 1980 x 155 mm (l ₁ x l
Stile of _{4), 480 × 155mm (l} 1 × l 2) and 480 × 215mm (l ₆
× l ₅ ) A horizontal frame was created.

As shown in Fig. 2, a vertical frame 2 and a horizontal frame 3 are arranged from both sides around the four sides of the double-sided decorative plywood 10, and pressed and bonded at room temperature with an aqueous vinyl urethane resin adhesive at 8 kg / cm ^{2 for} 2 hours. I let it. The application amount of the adhesive was 150 g / m ^{2 on} one side.

A 2 mm thick small-end veneer 4 was attached to the small end face in the longitudinal direction with hot melt resin to form a door having a thickness of 36 mm (see FIG. 3).

Finally, a urethane resin paint was applied three times by spraying to finish the coating.

Example 2 A melamine resin adhesive was applied to a 7.0 mm thick plywood at 150 g / m ² , a 0.6 mm thick pine veneer was laminated, and hot-pressed at 120 ° C. and 10 kg / m ^{2 for} 2 minutes to form a decorative plywood. did. The surface was sanded to a thickness of 7.5 mm, and a urethane resin paint was applied to finish the coating.

Further, when the two decorative plywood sheets were laminated with an ethylene-vinyl acetate resin emulsion adhesive to produce a double-sided decorative plywood sheet, two sound insulation sheets having a specific gravity of 2 and a thickness of 1.0 mm were inserted. The adhesive was applied at 180 g / m ² and pressed at room temperature for 2 hours at 2 kg / cm ^{2 for} 2 hours.

FIG. 4 shows an example in which a decorative plywood 1 having a decorative veneer 11 adhered to the surface of a plywood 12 has a sheet 5 such as a sound insulation sheet interposed therebetween to form a double-sided decorative plywood.

On the other hand, pine sawn timber is planarized to a thickness of 12 mm,
Vertical and horizontal frames were cut out to predetermined dimensions. Further, a urethane resin paint was applied using a roll coater, a flow coater, a side roll coater or the like to finish the coating.

A vertical frame and a horizontal frame are placed from both sides around the four sides of the double-sided decorative plywood, and 8K at room temperature using aqueous vinyl urethane resin adhesive
g / cm ^{2 was} pressed for 2 hours to adhere. The amount of adhesive applied is one side
It was 150 g / m ² .

After applying a urethane resin paint to a pine 2 mm thick small-end veneer with a roll coater, apply this small-end veneer with hot melt resin to the longitudinal small end surface of the door material where the frame material is bonded to the plywood. By bonding, a soundproof door with a thickness of 41 mm was created.

Example 3 A light-weight insulated door was prepared in Example 2 with the plywood having a thickness of 2.5 mm and using a foamed polystyrene having a thickness of 11 mm instead of the sound insulating sheet.

[Effects of the Invention] Each of the doors of Examples 1 to 3 was attached to the boundary between a room with air conditioning and a room without air conditioning, and was left for 3 months to measure the warp in the width direction, the longitudinal direction, and the diagonal direction. Results were shown.

On the other hand, when a commercially available flash door and a solid door were attached and tested in the same manner, a warp of 3 to 5 mm was generated, and it was not suitable.

As described above, the door according to the present invention does not cause warpage or distortion, has a solid feeling of weight, and can be easily manufactured.

In addition, sound insulation, sound insulation, heat insulation, lightweight materials, etc. are appropriately interposed in the middle of making double-sided decorative plywood,
Doors with various purpose functions can be created.

[Brief description of the drawings]

 FIG. 1 is a perspective view of a double-sided decorative plywood before bonding, FIG. 2 is an exploded perspective view showing an example of the door of the present invention, FIG. 3 is a perspective view showing one example of the door of the present invention, and FIG. It is sectional drawing of an example of a plywood. In the figure, 1 ... decorative plywood 10 ... double-sided decorative plywood 11 ... decorative veneer 12 ... plywood 21 ... vertical frame 3 ... horizontal frame 4 ... small end veneer

Claims (3)

(57) [Claims] 1. A decorative plywood in which a decorative veneer is adhered to a plywood,
The double-sided decorative plywood is laminated to form a double-sided decorative plywood, a grindboard is bonded to a portion corresponding to a frame portion of the double-sided decorative plywood, and a small-end veneer is bonded to at least two or more of the small end surfaces around the four sides. A wooden door that prevents warping. 2. The thickness of the double-sided decorative plywood is the total thickness of the door.
The wooden door according to claim 1, wherein the door is at least 1/4. 3. The warp prevention according to claim 1, wherein the double-sided decorative plywood is formed by laminating a bar, a paper honeycomb, a foamed plastic, a vibration damping / sound insulation sheet, etc. to an intermediate portion of the decorative plywood. Wooden door.