JPH08207013A - Decorative sheet and manufacture thereof - Google Patents

Abstract

PURPOSE: To make the development of cracks heard on the surface of the decorative veneer pasted onto wooden board by a method wherein synthetic rubber latex is applied on the surface of the wooden board and then damp-dried so as to form its elastic thick film between the decorative veneer and the plywood. CONSTITUTION: SBR latex having the nonvolatile matter of 40% is applied on the surface of wooden board such as plywood or the like and then tack-free damp-dried by being placed from five minutes in a hot-air drier held at 50-60 deg.C. After that, adhesive for decorative veneer consisting of urea-formaldehyde adhesive having the nonvolatile matter of 65%, vinyl acetate resin emulsion adhesive having the nonvolatile matter of 40%, wheat flour and 20% ammonium chloride water solution mixed in the predetermined mixing rate with one another is applied on the resultant surface of the wooden board. Then, under the condition that Japanese oak decorative veneer having the same size as that of the plywood is placed on the resultant surface of the wooden board, the decorative veneer is pasted to the wooden board with a hot press under the pressure of 8kg/cm<2> , at 110 deg.C for 60sec. Then, the surface of the decorative veneer is pigmentedly wiped with stain varnish and finally coated with polyurethane resin paint and dried so as to obtain the required decorative sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative veneer which is less likely to be cracked on the surface of a decorative veneer attached to the surface thereof and a method for producing the same.

[0002]

2. Description of the Related Art Various methods have been studied in order to prevent cracks occurring on a decorative veneer surface of a decorative veneer in which a decorative veneer is heat-pressed to a plywood surface via an adhesive. For example, by interposing a sheet-like material such as Japanese paper between the decorative veneer and the plywood, the veneer on the surface of the plywood buffers the expansion and contraction movement caused by absorption and release of water to make it difficult for the veneer to be transmitted to the decorative veneer. A method of correcting the movement of both fibers by making the fiber directions of the board and the decorative veneer orthogonal to each other, a method of using a plate material having no fiber orientation such as medium specific gravity fiber board or particle board instead of plywood, etc. There is.

[0003]

However, in the former method, there is a problem that the cost is high due to an increase in manufacturing process and materials, and in the middle method, the plywood is generally rectangular and has a fiber direction in the longitudinal direction. Since there is a structure that makes the fiber direction orthogonal, there is a problem that it will not be possible to manufacture a long product, and the latter method has some reduction in cracks, but the decorative veneer still expands and is satisfied. There was a problem that the effect was not obtained. Therefore, in order to solve these problems, a method has been proposed in which a WPC veneer in which a decorative veneer is impregnated and cured with a thermosetting synthetic resin is adopted, but the impregnating process and the impregnating device are large, and the manufacturing cost is very high. There was a problem of getting stuck. Another method has been proposed in which the adhesive layer is formed thick (applied in a large amount), but there is a problem in that the adhesive oozes out into the channel groove of the decorative veneer, resulting in a poor finish.

[0004]

[Means for Solving the Problems] The above-mentioned problem is a structure of a decorative board characterized in that a decorative veneer is adhered to a surface of a wooden substrate through a synthetic rubber latex and an adhesive for wood sequentially, and As a manufacturing method, a method of applying synthetic rubber latex on the surface of a wooden substrate, drying it rawly, applying an adhesive for wood on this, placing a decorative veneer on it and applying heat and pressure is adopted. Will be solved.

Plywood, particle board and fiber board are used as the wood substrate. As the synthetic rubber latex, SBR latex, NR latex, CR latex, or the like, or those modified to impart polarity to them is used. Adhesives for wood include urea resin, melamine-urea co-condensation resin, vinyl acetate resin emulsion, ethylene vinyl acetate resin emulsion, synthetic rubber latex, acrylic resin emulsion, and other emulsion type adhesives in which fine particles of resin are dispersed in water. A mixture of agents is used.

[0006]

According to the present invention, the synthetic rubber latex is coated on the surface of the wooden substrate and then dried to form a thick film having elasticity between the decorative veneer and the plywood. So, especially when the wooden board is plywood,
The movement of the fibers of the veneer on the surface of the plywood is moderated by the synthetic rubber latex and is difficult to be directly transmitted to the decorative veneer, so that the surface of the decorative veneer is less likely to be cracked. In addition, since it is dry-dried, it does not seep into the conduit groove of the veneer.

[0007]

【Example】

(Example) Thickness 12 mm, width 303 mm, length 303 m
After applying 18 g of SBR latex having a non-volatile content of 40% to the surface of the plywood of m, it was placed in a hot air dryer kept at 50 to 60 ° C. for 5 minutes and dried to a non-sticky state,
On this surface, 60 parts by weight of a urea-formaldehyde adhesive having a nonvolatile content of 65%, 40 parts by weight of a vinyl acetate resin emulsion adhesive having a nonvolatile content of 40%, 5 parts by weight of flour and 20% by weight.
Apply 10 g of an adhesive for decorative veneer consisting of 2 parts of ammonium chloride aqueous solution. On this surface, place a veneer veneer with a thickness of 0.3 mm and the same width and length as plywood, and press with a hot press. Hot pressing was performed under the conditions of 8 kg / cm 2, temperature of 110 ° C., and time of 60 seconds, after which stain was applied to the surface by coloring and wiping, then 10 g of polyurethane resin paint was applied and dried to obtain a desired decorative plate.

(Comparative Example 1) Thickness 12 mm, width 303 m
After applying 10 g of the same adhesive for decorative veneer used in the example to the surface of a plywood having a length of m and a length of 303 mm, the surface of the plywood having a thickness of 0.3 mm and the same width and length as the plywood is used. Place the plate and press it with a hot press at a pressure of 8 kg / cm2 and a temperature of 11
Hot-pressing was carried out under the conditions of 0 ° C. and time of 60 seconds, and after that, stain staining was applied to the surface, then 10 g of polyurethane resin coating material was applied and dried to obtain a desired decorative board.

(Comparative Example 2) Thickness 12 mm, width 303 m
After applying 10 g of the same adhesive for decorative veneer used in the example to the surface of a plywood having a length of m and a length of 303 mm, the surface of the plywood having a thickness of 0.3 mm and the same width and length as the plywood is used. The plate is placed perpendicular to the fiber direction of the veneer on the surface of the plywood, and hot pressed at a pressure of 8 kg / cm 2, a temperature of 110 ° C., and a time of 60.
After heat-pressing under the condition of seconds, the surface was colored and wiped with stain, and then 10 g of polyurethane resin paint was applied and dried to obtain a desired decorative plate.

(Comparative Example 3) Thickness 12 mm, width 303 m
After applying 12g of vinyl acetate resin emulsion adhesive to the surface of plywood of m and length of 303mm, weigh 3 on this surface.
After placing 6 g of Japanese paper on which 12 g of the same adhesive for decorative veneer used in the example was applied, a thickness of 0.3 m was obtained.
A veneer veneer with m and width and length the same dimensions as the plywood is placed perpendicular to the fiber direction of the veneer on the surface of the plywood, and hot press is applied at a pressure of 8 kg / cm2, a temperature of 110 ° C., and a time of 60 seconds. Then, the surface was colored and wiped with stain, and then 10 g of polyurethane resin paint was applied and dried to obtain a desired decorative plate.

(Comparative Example 4) Thickness 9 mm, width 303 mm,
After bonding a medium specific gravity fiberboard having a thickness of 3 mm and a width and length having the same dimensions as the plywood to the surface of the plywood having a length of 303 mm by a conventional method,
On this, 9 g of the same adhesive for decorative veneer used in the example was applied, and a veneer veneer having a thickness of 0.3 mm and the same width and length as plywood was placed thereon, and hot pressed. Pressure 8kg
/ Cm2, temperature 110 ± 5 ° C., time 60 seconds for hot pressing, and then stain wiping stain on the surface, apply 10 g of polyurethane resin coating and dry to obtain the desired decorative board.

(Comparative Example 5) Thickness 12 mm, width 303 m
10 g of the same adhesive for decorative veneer used in the examples was applied to the surface of a plywood having a length of m and a length of 303 mm, and a thickness of 0.5 was applied on the adhesive.
Nara WPC decorative veneer with dimensions of mm and width and length same as plywood is placed, pressure 8kg / cm2, temperature 11 with hot press.
Hot-pressing was carried out under the conditions of 0 ± 5 ° C. and time of 60 seconds, and after that, stain staining was applied to the surface, then 10 g of polyurethane resin coating was applied and dried to obtain a desired decorative board.

Repeating cold heat B with these decorative boards
The test was carried out for 2 cycles, and the results are shown in Table 1. As is clear from these results, the decorative board according to the present invention is less likely to be cracked than the WPC veneer of Comparative Example 5 as compared with Comparative Examples 1 to 4.

[0014]

[Table 1]

[0015]

According to the present invention, the synthetic rubber latex is coated on the surface of the wooden substrate and then dried to form a thick film having elasticity between the synthetic veneer and the plywood. Since it is formed, especially when the wooden substrate is plywood, the movement of the fibers of the veneer on the surface of the plywood is alleviated by the synthetic rubber latex and is difficult to be directly transmitted to the decorative veneer, so that the surface of the decorative veneer is less likely to be cracked. In addition, since it is dry-dried, it does not seep into the conduit groove of the veneer.

Claims (2)

[Claims] 1. A decorative board, wherein a decorative veneer is adhered to a surface of a wooden substrate through a synthetic rubber latex and a wood adhesive in this order. 2. A synthetic rubber latex is applied to the surface of a wooden substrate, dried and dried, an adhesive for wood is applied thereon, and a decorative veneer is placed on the adhesive and heat-bonded. A method for manufacturing a decorative board.