JPS58136402A - Manufacture of surface reinforced plywood - 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 The present invention relates to a plywood processing method that simultaneously performs surface strengthening treatment and TK seaming of the veneer.

Conventionally, methods for strengthening the plywood surface include using the plywood as a substrate, applying paint and cloth to the surface and letting it dry, or layering synthetic resin-impregnated paper on the plywood surface and then heat-pressing it. Is the above processing tmL? Plywood is widely used as decorative plywood and plywood for contour frame frames. However, since the above-mentioned surface treatment is carried out using plywood as a substrate, products manufactured using **sm must be more expensive than the plywood substrate, and there is a limit to how much cost can be reduced.

Therefore, in the present invention, we have studied a method for treating the surface of plywood and have completed a method that can be done at low cost and with high work efficiency.

That is, the present invention involves applying an adhesive to one or both sides of the middle veneer or core veneer, and also applying a thermosetting synthetic resin to the surface of the top veneer, in a common plywood manufacturing process. The most distinctive feature of the l1ii11 method for surface-reinforced plywood, which is characterized by bonding the veneers together by heat pressing and simultaneously curing the thermosetting synthetic resin applied to the surface of the top veneer, is as follows: Thermosetting synthetic resin 11T was applied to the surface of the @It floor veneers prepared in the plywood molding process, and the adhesion of the veneers to each other and the curing of the thermosetting St resin were completed in a single heat-pressing process. Surface reinforced plywood k all jk-j.

Hereinafter, the present invention will be described in detail with reference to the drawings. The drawings are plan views showing embodiments of the present invention.

( ) indicates a maid board veneer or core board veneer that has been dried and cut to a predetermined size 4c, and 2) indicates a top board veneer that has been dried and cut to a predetermined size.

(3) shows an apparatus for applying adhesive to both sides or one side of a medium veneer or a T& veneer using a spreader. As an adhesive, use urea resin or Mera! Commonly used thermosetting N-adhesives for plywood production, such as resins or phenol III resins.

(In this case, a commonly used spreader or p-coater is used to apply thermosetting synthetic III1M to the surface of the top veneer.) (4) As a thermosetting synthetic resin for applying KIk to the surface of the veneer board using the coating device, urea resin or Metoon II can be used.
11 or phenol resin, as well as epoxy resin, urene resin, diallyl phthalate) 1111, etc., are made into a face shape, and the same resin as the adhesive used to adhere 1 meter of veneer may be used. If the amount of thermosetting synthetic resin applied to the veneer is approximately 100 to 200 mm/-, it will be possible to fill in the channel grooves on the surface of the veneer and give the surface a smooth finish.

(5) indicates a heat-resistant sheet having ■ shape.

Heat-resistant sheet (5) Commonly used films made of synthetic resins such as repropylene, polyester, or polycarbonate. Thickness of metal thin such as thin is 20μ~10
0PI! It's good to have a degree. Note that the back plate veneer, middle plate veneer, etc. are preferably placed on the outlet side of the spreader (3). Each of the veneers arranged as described above was moved as indicated by the arrow in the figure, and a heat-resistant sheet (6) having compatibility was overlaid on the mechanism f1 (6). Insert it into the cold press () and cold press it. The pressing conditions are b~10kg/ell-10~6
The laminated veneer of the plywood molding is inserted between the hot plates of the press (8) with the release sheet (5) placed on its surface, and then hot pressed for about 0 minutes. Then, bond the veneers together and cure the thermosetting synthetic resin applied to the surface of the top veneer to make plywood.The heat pressure conditions are 8~1ak@/r:d-100~
At 120°C the time is determined by the thickness of the plywood. Next, the scissor plywood is taken out from between the hot plates (8) and the heat-resistant sheet (5) placed on the surface thereof is peeled off to form the desired surface-reinforced composite. In the case of this example, thermosetting synthetic wood W is applied to the surface of the top veneer when the veneer is assembled into a plywood structure.
J1 was applied, but the veneer was constructed into a plywood structure and 1 was applied after cold pressing.
111& may be coated with a thermosetting synthetic resin and coated with a heat-resistant sheet. Also net press (8) hot plate II
! If the fluorine coating is coated with a fluoride coating to impart mold releasability, it is possible to omit the use of a heat-resistant sheet with mold releasability.Since the present invention has the above-described configuration, it is possible to omit the use of a heat-resistant sheet that has mold releasability. The surface reinforcement of plywood, which previously required 8 degrees of hot pressing, can now be completed with just one heat pressing.
Productivity can be greatly improved by shortening the precipitate, and the price of each product can be reduced.In addition, the surface of the resulting surface-reinforced IJa1 plywood has been hardened and smoothed by the t-threat** layer, making it suitable for concrete. -) If used as a base plate for the frame, a smooth and good-looking concrete surface can be obtained.
The number of times the frame can be reused can also be greatly increased.

Furthermore, if the obtained plywood is used as a flooring material, it can be used as a highly durable decorative board with a high surface Wk.
.

[Brief explanation of drawings]

The drawing is a plan view showing a part of a plywood manufacturing process according to an embodiment of the present invention. (1) - Middle plate veneer or core plate veneer (2) - Top plate veneer (3) - Spreader - (4) - Spreader - (6) - Heat-resistant sheet with mold release properties (6) -
Veneer assembly table (7) - cold press (8) -
Dimitsuto Press (9) - Seeking plywood applicant Hirotada Dantani, representative of Dantani Sangyo Co., Ltd.

Claims (1)

[Scope of Claims] Engineering Regular plywood manufacturing process IiK O-, medium board veneer or $
In addition to applying adhesive to one or both sides of the temporary veneer, heat-curing pseudo-synthetic 41II11 is also applied to the top veneer *tm, and the veneers are bonded to each other by heat pressing. A method for producing surface-reinforced plywood, which comprises curing a heat-cured resin applied to the surface of a veneer board. 2 In the regular use of the building structure II, the middle board veneer or the core board veneer and the core board veneer applied with adhesive on both sides or one side Km by the usual method.
A top veneer coated with iK thermosetting pseudo-synthetic resin and a back veneer are assembled into a plywood structure to form a set of laminated veneers, and a heat-resistant sheet with lll1 shape is placed above the top veneer. Then, the laminated veneer of plywood #I was placed with a heat-resistant sheet on its surface, and then inserted between the hot plates of a hot press and heat-pressed. A method for producing surface-reinforced plywood according to claim H, wherein the heat-resistant sheet is removed from between the thermonuclear discs and peeled off. In the commonly used plywood type construction #A, a set of plywood is constructed of a middle plate veneer or a core plate veneer, a top plate veneer, and a back plate veneer with adhesive applied to both or one side by the usual method. After cold pressing as a laminated veneer, a thermosetting synthetic resin is applied to the surface of the laminated veneer, and a heat-resistant sheet having an I11# shape is placed on the upper surface, or a hot sheet is heated. A method for manufacturing a surface-reinforced plywood according to claim 1, which comprises inserting the plywood between the hot plates of a press and heat-pressing it, then removing it from between the hot plates and peeling off the heat-resistant sheet.