JPS5814975A - Production of decorative board - Google Patents

Abstract

PURPOSE:To offer a decorative sheet free from fouling or color shading, by forming an under coat paint film on the surface of a coniferous veneer, which is brushed into a rugged state, removing the paint film until the convex part of its winter grain is exposed to fill the concave part of its summer grain with the paint, and then forming a topcoat film of hot-press molten resin. CONSTITUTION:A coniferous veneer 2 to be stuck to the surface of a substrate 1 such as a plywood, fiber board or metal plate is brushed into a rugged surface 2a, 2b state in a manner such that a soft summer grain part having coarse fibrous structure is removed and that a hard winter grain part having dense fibrous structure is left. An undercoat paint film 3 is formed on the rugged surface by a flow coater, roll coater or the like. The undercoat paint film is then removed until the convex surfaces 2a of the winter grain part are exposed, so that the concave surfaces 2b of the summer grain part are filled with the paint 3'. In this way, a flat surface is prepared. Thereafter, the topcoat film 4 of hot- press molten resin is formed on the flat surface by hot-press or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a decorative surface that uses a coniferous veneer as a decorative surface and then heat-presses a beautiful hard surface coating of melted fat on the surface using hot press or the like. This invention relates to a method for manufacturing a board.

In general, decorative veneer materials that use coniferous veneer for the decorative surface,
In order to form a relatively hard decorative surface, the surface of the coniferous veneer was ground with a pusher to remove the coarse and soft springwood portion of the fibrous structure, while leaving the dense and hard autumnwood portion of the fibrous structure. It has been practiced to form a rough extraction surface and form a surface coating on the uneven surface.

Conventionally, in forming this surface coating, in order to form a hard coating, hot-pressure molten resin is directly pressure-bonded onto the uneven surface using a hot press or the like. However, in this resin crimping, the degree of impregnation may be different due to the softness and hardness of the wood structure and the difference in the density of the water salt, for example, the degree of impregnation may be different, such that more resin is impregnated in the autumn wood part where the water salt is denser than in the spring wood part where the water salt is denser. As a result, discoloration and stains occur on the surface coating, reducing the commercial value of the decorative board material. t+, ri When a convex surface is subjected to heat-pressure molten resin treatment, pressure is not applied to concave portions relative to convex portions, which may cause foaming and curing failure.

Instead of this hot-pressing process, roll-ta.

It is also possible to perform surface coating treatment using a flow coater, etc., but it is difficult to finish the surface smooth with kerosene coating molding, so it may be possible to apply a coniferous wood veneer after forming the surface wave II. Due to changes over time, different degrees of expansion and contraction occur between the film and the substrate, and if the strength is not strong enough to withstand the expansion and contraction, dry cracks will occur in the surface coating.

In t&, the present invention deals with color unevenness due to differences in density of wood fibers. In addition to preventing the generation of stains, the heat-pressure melting resin treatment 3
1If--An object of the present invention is to provide a method for manufacturing a decorative board that forms a more dense surface coating.

That is, in the method for manufacturing a decorative board according to the present invention, a film is formed on the surface of the coniferous veneer, which has been made into an uneven surface by brush grinding, using a 7E1-coater, a roll coater, etc. Both K and Smooth 1 where the paint film is removed until the convex surface of the soft wood part is exposed and the paint is filled into the concave part of the spring wood part.
JKL, then KL to form a surface coating by compressive adhesion of hot pressure molten resin onto the smooth image of 7.

Below, this will be explained based on the flow of diagrams and illustrations as follows.

The illustrated decorative board has a coniferous veneer 2 on the surface of the substrate 1 as appropriate.
A plate material to be used as a base material is formed by pasting the material. Among these, plywood is used as the substrate l.

Fiberboard, metal plate, etc. can be used, and as the coniferous veneer, pine, toga, cedar, cypress, etc. can be thinly cut using a rotary lace, a slicer, etc., and a veneer can be used.

For single [2, before or after adhering to the surface of the substrate l,
Add a grinding process to the wire brush. During this grinding process, a veneer 20 is placed under the wire brush rotating at high speed.
It can be applied by passing through the surface side. After this grinding process, the surface of the veneer 2 becomes a highly uneven surface, with the spring wood portion having a coarse and soft fiber structure being removed, and the fall wood portion having a dense fiber structure and being hard remaining.

Next, for the unevenness 1ifK, use a 7o-coater.

The lower arms are applied using a roll coater or the like.With the m scissors using a roll coater, flow coater, etc., the paint can be adhered without being pressure-bonded. Sixth, the paint can be extremely immersed into the uneven surface. Never. This undercoat] After forming coating film 3, veneer! Until the top of O convex part 2 is exposed,
Remove the undercoat film 3. Removal of the paint film in step 7 can be done by wiping it with a cloth, etc. before drying, and after drying and hardening, it can be ground with a brush, etc., or cut with a plane, soufflette bar, etc. you can do it well
After removing this film, the surface of the veneer 20 is placed under Ik in the recess 2b.
] The genus 3' becomes the remaining smooth surface. The smooth surface of t and 7 is replaced with a resin layer 3' having a higher hardness than the harder autumn wood portion 2a and spring wood portion 2b, so that the entire surface of 6 is hard.

A hot pressure molten resin is bonded to this smooth surface using a hot press or the like to form a surface coating 4. In this pressing process,
As mentioned above, the construction am is formed hard in advance,
Even if the resin is applied by pressure bonding, there will be no uneven impregnation of 7O, and there will be no uneven color or fading.Since the surface of the veneer 20 is smooth and molded, there will be variations in the degree of compression. This results in a completely homogeneous resin coating.

I! In addition, since the surface coating is formed by pressure compaction, it is extremely hard.It can sufficiently resist the expansion and contraction movement of the constituent material plates due to changes over time, and is able to withstand cracking without drying out. It is preferable that the paint forming the lower coating film 3' and the resin forming the surface coating 4 are compatible with each other. Examples include polyurethane and phenol for multi-primer paints.

Alkyd, aminoalkyd, vinyl, epoxy.

Resins such as unsaturated polyester and thermosetting acrylic,
- Examples of the resin for forming a film on the blade surface include resins such as epoxy, polyester, DAP, cretan, me2mine, phenol, styrene, and vinyl.

EXAMPLE A vinyl acetate adhesive was applied to the surface of lauan plywood using a glue coater, and a Toga veneer with a thickness of 0.3 mm was adhered to the lI surface. The spring material portion was removed by placing it on a transfer table and passing under a wire brush rotating at high speed, and urethane resin was applied to the entire uneven surface using a 70-coater and dried.

After that, remove the undercoat film with a sander until the top surface of the convex part is exposed, and make a smooth surface with the undercoat film remaining only in the concave part. After placing the epoxy sheet on the smooth surface,
Heat pressure with hot press #! - Don't deal with it.

The thus obtained large decorative board has a beautiful hard surface coating without uneven coloring or stains.

[Brief explanation of the drawing]

The drawings show side cross-sectional views of the panels sequentially constructed using the decorative board manufacturing method according to the present invention. After removal of the wheels and horses, FIG. 4 shows the state after the surface coating is formed. l: substrate, 22 coniferous veneer, h: convex portion, 2b: concave portion,
3 (3'): Undercoat film, 4: Surface film.

Claims (1)

[Claims] Apply push-grinding to the softwood veneer that is attached to the surface of the appropriate substrate such as plywood, fiberboard, metal plate, etc.], ``Remove the soft spring wood part with a coarse fiber structure, and also remove the soft spring material with a coarse fiber structure. A dense, hard layer of the autumn wood is formed on the remaining uneven surface, and a 7el-coater, roll coater, etc. is used to form a coating film on the uneven surface, and then this undercoat film is applied to the remaining uneven surface of the autumn wood. A method for manufacturing a decorative board, characterized in that the material is removed until it is exposed, and then a paint is filled and buried in the recesses of the spring material to form a smooth surface, and then a surface coating of hot-pressure molten resin is formed by hot pressing or the like. .