JP2881909B2 - Wooden veneer and its manufacturing method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a thin wooden veneer and a method for producing the same, and more particularly, to a method for forming a composite layer of a fiber-reinforced synthetic resin in which small pieces of wood are dispersed on one surface of a metal substrate. Laminated, in a wooden decorative board provided with a coating film of an unsaturated polyester resin thereon, by disposing a fiber base material impregnated with a synthetic resin such as an unsaturated polyester resin on the other surface of the metal substrate, Before the formation of the coating film made of the unsaturated polyester resin, the metal substrate is warped so that the composite layer side is convex, and the buffing operation is easily performed so that the coating film side made of the unsaturated polyester resin does not warp. It was done.

2. Description of the Related Art Conventionally, a wooden decorative board having a natural wooden pattern exposed on its surface as a decorative surface has been widely used as a material for tables, counters, furniture and the like.

For example, a highly rigid wooden decorative board obtained by disposing a prepreg sheet on a hard substrate such as an aluminum plate, dispersing small pieces of wood on the surface thereof, and applying heat and pressure is known (Japanese Patent Application No. Sho 63-163). −288137).

To apply a coating made of an unsaturated polyester resin to the surface of this wooden decorative board, cure it, and buff the coating to obtain a mirror-finished surface (hereinafter referred to as a mirror-polished polyester surface), After sanding the surface of a decorative board having high rigidity, a coating made of an unsaturated polyester resin is applied and cured, and then sanding and buffing are performed.

As shown in FIG. 3, the buff polishing uses a method in which the cured unsaturated polyester resin coating surface 2a of the plate 2 is polished to a mirror surface by the buff 1.

[Problems to be Solved by the Invention] However, when an unsaturated polyester resin paint is applied and cured, the volume shrinkage accompanying the curing is large, and the shrinking force causes the plate 2 to move as shown by a two-dot chain line in FIG. In addition, the unsaturated polyester resin coating surface 2a side is warped concavely, and it becomes difficult to polish the buff 1 with the flat polishing surface.

In order to prevent the unsaturated polyester resin coating surface from warping concavely, even a highly rigid plate using a hard substrate requires a thickness of 12 mm or more, and a thin thickness of 1 to 4 mm. , The board cured by applying unsaturated polyester resin,
Since the surface of the unsaturated polyester resin coating surface warps concavely, buffing cannot be performed efficiently, resulting in high cost.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a thin wooden decorative board having a mirror-finished polyester finish, which can be efficiently produced, and a method for producing the same.

Means for Solving the Problems In order to achieve the above object, the wood decorative board of the present invention is provided with a fiber-reinforced synthetic resin layer in which small pieces of wood are dispersed on one surface of a metal substrate. A coating film made of an unsaturated polyester resin is provided on the reinforced synthetic resin layer, and a fiber reinforced synthetic resin layer is provided on the other surface of the metal substrate.

In addition, a method for producing a wooden decorative board is a method in which a metal substrate is placed on a fiber base material impregnated with an uncured synthetic resin, and small pieces of wood are dispersed on a reinforcing fiber base material impregnated with the uncured synthetic resin on the metal substrate. After the substrate is placed and heated and pressurized to cure the resin to obtain an integrated product, an unsaturated polyester resin paint is applied on the composite base material of the integrated product.

[Operation] The shrinking force of the fiber-reinforced synthetic resin layer and the shrinking force of the unsaturated polyester resin coating cancel each other out, so that the coating film side does not warp after the unsaturated polyester resin coating is formed. By adjusting the resin impregnation amount and the thickness of the fiber-reinforced synthetic resin layer, the coating film surface side can be slightly warped to be convex, and buff polishing or the like can be easily performed.

"Example" Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a decorative board according to the present invention, in which reference numeral 11 denotes a metal substrate.

As the metal substrate 11, for example, an aluminum plate, an aluminum alloy plate, a stainless steel plate, a carbon steel plate, or the like having a thickness of about 0.2 to 2 mm is used.

On the upper surface of the metal substrate 11, a fiber reinforced synthetic resin layer 13 in which small pieces of wood 12 are dispersed is provided in close contact and fixed. On the upper surface of the fiber reinforced synthetic resin layer 13, a coating made of an unsaturated polyester resin paint is applied. A membrane 14 is provided. A fiber-reinforced synthetic resin layer 15 is provided on the lower surface of the metal substrate 11.

The fiber reinforced synthetic resin layer 13 and the fiber reinforced synthetic resin layer
As the synthetic resin for forming 15, for example, epoxy resin,
A thermosetting resin, such as an unsaturated polyester resin, a diallyl phthalate resin, a polyurethane resin, a silicone resin, and a phenol resin, which is in a liquid state before curing is used.

In addition, as the fibers, cloth or glass paper made of synthetic fibers such as glass fibers, polyamides, and polyesters,
Alternatively, a non-woven fabric such as a swirl mat made of acrylic fiber, vinylon fiber, polyester fiber or the like is used, and the basis weight thereof is 20 to 200 g / m ² , preferably about 50 to 80 g / m ² .

Also, in the small wood pieces 12, black tongue, beech, oak, ton,
It is a piece of wood such as hardwood, cedar, hippo, oak, teak, paddock, etc., hardwood, cedar, cypress, pine, spruce, agatis, etc., the shape of which is not particularly limited, but is in the form of plate, cuboid, cube. A variety of shapes such as small pieces formed by cutting such as particles, or small pieces obtained by crushing these small pieces by mechanical impact, roller pressing, or the like are used.

In the decorative panel having the above-described configuration, the fiber-reinforced synthetic resin layer 15 is provided on the lower surface of the metal substrate 11, so that the unsaturated polyester resin coating film is formed on the upper surface of the fiber-reinforced synthetic resin layer 13 provided on the upper surface of the metal substrate 11. Even if is formed, it is prevented that the coating film side is concavely warped, and buffing can be easily performed. Further, since the metal substrate 11 is used, the bending process is easy.

 Next, a method for producing a wooden decorative board according to the present invention will be described.

FIG. 2 shows an example of a method for producing a wood decorative board according to the present invention, in which a metal substrate 11 is placed on a fiber base material 21 impregnated with an uncured synthetic resin. A composite substrate 23 in which small pieces of wood 12 are dispersed is placed on a fiber substrate 22 impregnated with a liquid synthetic resin.

The fiber base material 21 impregnated with the uncured synthetic resin, and the fiber base material 22 impregnated with the uncured synthetic resin, the lower prepreg sheet 21a in which the impregnated resin is in a semi-cured state,
In addition, since the upper prepreg sheet 22a is easy to handle, it is usually used as a prepreg sheet.

The synthetic resin impregnated in the fiber base material may be used by adding an appropriate additive such as a filler and a coloring agent, if necessary. The filler here is calcium carbonate,
Aluminum hydroxide, talc, titanium oxide, silica, glass powder and the like are used, and the compounding amount is about 50 to 250 parts by weight with respect to 100 parts by weight of the resin liquid. Further, the coloring agent is added to the synthetic resin forming the composite base material 23, and a yellowish, brownish, brownish color tone dye or pigment is preferable, but other colors may be used, and the addition amount is particularly limited. Never.

The impregnation of the fibrous base material with the thermosetting resin liquid is performed by a conventional method such as continuously dipping the fibrous base material in an impregnation tank filled with the thermosetting resin liquid. Curing is performed by heating the fiber base material of the impregnating agent at 90 to 100 ° C. for about 5 to 10 minutes.

The lower prepreg sheet 21a, the metal substrate 11, the upper prepreg sheet 22a, and the small piece of wood 12 are superimposed on each other using a known hot press at 100 to 180 ° C and 10 to 20 kg / cm ^2.
These are integrated by heating and pressurizing with the upper and lower prepreg sheets 22a, 21a and the metal substrate 1
It is preferable to interpose an adhesive sheet 24 made of a thermosetting resin having a thickness of 10 to 60 μm in order to increase the adhesive force between them.

The integrated material thus obtained is in a state in which the fiber base 21 side is slightly warped concavely due to the curing of the fiber base 21 impregnated with the uncured synthetic resin.

The mirror is then subjected to a mirror finish.

To perform mirror finishing, first, the surface on which the small wood pieces are present is sanded, and a urethane sealer 25 and an unsaturated polyester resin paint 26 are applied thereto and cured to form an unsaturated polyester resin coating film. Then, this coating surface,
It is sanded and buff-polished to a mirror finish to obtain the decorative plate of the present invention. In this case, the thickness of the urethane sealer 25 is 20 to 50 μm, and the thickness of the unsaturated polyester resin coating film 14 is
It is 250-600 μm.

Also, when making the above-mentioned integrated product, by adjusting the number or thickness of the lower prepreg sheet 21a, the balance of the contraction force with the upper prepreg sheet 22a can be freely adjusted, and the unsaturated polyester resin By appropriately warping the side on which the resin is applied, it is possible to prevent the coated surface side from warping concave even after the unsaturated polyester resin paint is applied and cured and contracted.

In addition, before heating and pressing by a hot press, the superimposed products are allowed to stand at 15 to 30 ° C. for 3 to 4 hours to promote curing of the curable resin, increase viscosity, and facilitate handling. I can do it.

According to the method of the present invention, by using the lower prepreg sheet 21a, after the unsaturated polyester resin coating film is formed, the state of warpage of the plate can be adjusted. Is prevented, buffing is facilitated, and a thin decorative board can be efficiently produced.

Example 1 A 50 g / m ² glass nonwoven fabric was impregnated with epoxy resin via a 20 μm-thick phenol butyral adhesive sheet on the top surface of a 1.0 mm thick aluminum plate treated with chromium phosphate to improve adhesion. In addition, three upper prepreg sheets were arranged, and small pieces of wood were scattered on the three upper prepreg sheets. In addition, the lower surface of the aluminum plate is weighed 50 g /
The two lower pre Plague sheet impregnated with epoxy resin were placed on each polyester nonwoven m ² and 180 g / m ^2.

This was pressed at 140 ° C. under a pressure of 15 kg / cm ² for 60 minutes to form a decorative board. In this decorative board, the surface side where the small wood pieces exist was warped convexly.

The surface on which the small wood pieces were present was sanded with # 120 to # 240, and a urethane sealer and an unsaturated polyester resin paint were applied and cured. In this case, the warpage was slightly reduced due to the contraction force of the unsaturated polyester resin coating material, but the unsaturated polyester resin coating film side did not warp concavely.

Then, sanding and bath polishing were performed to obtain a decorative board having a mirror-polished polyester finish and a thickness of about 3 mm.

"Effects of the Invention" As described above, the decorative board and the method for manufacturing the same according to the present invention, since the fiber base material impregnated with the uncured synthetic resin is attached to the lower surface of the metal substrate, the number thereof, By adjusting the thickness, the balance between the fiber base material impregnated with the resin disposed on the upper surface of the metal substrate and the contraction force of the unsaturated polyester resin coating film applied on the upper surface can be freely adjusted. It is prevented that the coating film surface is concavely warped.

Therefore, there is an advantage that buff polishing is facilitated and the productivity of a thin decorative board having a mirror-surface polyester finish is increased.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a decorative board according to the present invention, FIG. 2 is an explanatory view showing an example of a manufacturing method, and FIG. 3 shows a state in which a board coated with unsaturated polyester is buff-polished. FIG. 1 buff, 2 plate, 2a polyester coated surface, 11
... metal substrate, 12 ... wood pieces, 13 ... fiber reinforced synthetic resin layer, 14 ... unsaturated polyester resin coating, 15 ... fiber reinforced synthetic resin layer, 21 ... impregnated with uncured synthetic resin Fiber substrate, 21a: lower prepreg sheet, 22: fiber substrate impregnated with uncured synthetic resin, 22a: upper prepreg sheet, 23: composite substrate, 24: adhesive sheet, 25 …
... urethane sealer, 26 ... unsaturated polyester resin paint.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI B32B 21/02 B32B 21/02 27/36 101 27/36 101 (72) Inventor, Kazuo Omoto 10 Nakazawacho, Hamamatsu City, Shizuoka Prefecture No. 1 Inside Yamaha Corporation (58) Field surveyed (Int. Cl. ⁶ , DB name) B32B 33/00 B05D 7/24 B32B 15/08 B32B 17/04 B32B 21/02 B32B 27/36 B32B 15 /Ten

Claims (2)

(57) [Claims] 1. A fiber-reinforced synthetic resin layer in which small pieces of wood are dispersed on one surface of a metal substrate, and a coating made of an unsaturated polyester resin is provided on the fiber-reinforced synthetic resin layer. Characterized in that a fiber-reinforced synthetic resin layer is provided on the other surface of the wooden decorative board. 2. A metal substrate is placed on a fiber base material impregnated with uncured synthetic resin, and a composite base material in which small pieces of wood are dispersed on a reinforcing fiber base material impregnated with uncured synthetic resin is placed on the metal substrate. And heating and pressurizing to cure the resin to obtain an integrated product, and then applying an unsaturated polyester resin paint on the composite base material of the integrated product.