JPS5919001B2 - Decorative veneer manufacturing method - Google Patents

Description

[Detailed description of the invention] This invention relates to a method for manufacturing decorative veneers.

Conventionally, a flinch was created by applying adhesive to a veneer with a thickness of 0.2 to 0.5 rran, stacking multiple sheets and press-molding, and slicing this clinch to create a decorative unit with a wood grain pattern. They were manufacturing boards.

However, in this case, when slicing the clinch, the adhesive portion, which has progressed to hardening and has a high 1u property, cracks or peels off, making it difficult to manufacture.

Therefore, a method was proposed in which the flinch is boiled to give flexibility to the adhesive part and then sliced.
This method also requires a long process and is complicated to manufacture.

Therefore, an object of the present invention is to provide a method for manufacturing a decorative veneer that is easy to manufacture.

In summary, the method for producing decorative veneers of the present invention involves applying an adhesive to a plurality of veneers, which is bonded in a flexible state and hardened by heat treatment to increase rigidity, and laminated and bonded. clinch? 7a- The feature is that the adhesive is sliced into a veneer shape in a flexible state, and then heated to harden the adhesive.

Next, the manufacturing method of this invention will be explained.

Examples of adhesives having the above characteristics include the following adhesives.

(1) A two- or three-component adhesive consisting of a thermoplastic resin, rubber, and a thermosetting resin.

(2) Uncured state of 8 dimensions or C stage in terms of chamber width 7
An adhesive whose main component is a thermosetting resin that hardens through heat treatment.

A preferable ratio of the thermoplastic resin and rubber or thermosetting resin in the above δ1) is 100 for the former and 5 to 100 for the latter.

As the thermoplastic resin, for example, vinyl acetate resin or ethylene-vinyl acetate copolymer resin is used.

As the rubber, for example, acrylic rubber, nitrile rubber, or chloroprene rubber can be used.

As the thermosetting resin, for example, yurya resin, melamine resin, melamine-yulya resin, phenol resin, and epoxy resin are used.

The above resins may be water-soluble, emulsion, or solvent type.

The B or C stage indicates the degree of condensation of the thermosetting resin, and the B stage is a stage in which the monomers are linearly condensed (including some branching) and crosslinking has not yet occurred.

The C stage is a stage where condensation progresses further and curing shrinkage begins to occur, and is a stage before complete curing.

The thus obtained adhesive is applied to a plurality of veneers (preferably 0.2 to 0.5
m), the veneers are stacked and pressed across the width of the chamber to obtain a flitch.

Next, slice this clinch to get a decorative veneer.

Next, this decorative veneer is used as a surface layer and heated and pressed in a conventional manner to produce plywood.

This hot press treatment causes the adhesive to harden, increasing its rigidity and exhibiting sufficient adhesive performance.

As described above, according to the manufacturing method of the present invention, since a flitch is constructed by gluing a plurality of veneers together while the adhesive is flexible, the adhesive portion may break when slicing the flitch. It will not peel off.

Further, since there is no need to boil the flitch to impart flexibility to the adhesive as in the conventional method, manufacturing is facilitated.

100 parts of vinyl acetate emulsion (product name: Polysol 5000, manufactured by Showa Kobunshi Co., Ltd.) and 30 parts of melamine-Yulya resin (product name: Polysol 5000) were added to a lauan veneer (thickness l mm) with a moisture content of 10 to 15%. Apply a mixed adhesive of Daijin Resin PWP-8 (manufactured by Daijin Shinko Co., Ltd.), stack several pieces of this, and as shown in Figure 1, create a pair of molds 1 with corrugated pressing surfaces. A flitch 3 is obtained by press molding at room temperature in step 2.

Next, the obtained flitch 3 is cut with a cutting edge 4 to a thickness of 0.6 mm as shown in Fig. 2. Slice into m pieces to obtain a decorative veneer with a wood grain pattern.

In this case, is the flitch just moist enough to be sliced? The adhesive force of the Tiki-Tsu mixed adhesive was good, and there was no peeling between the wood grains.

The obtained decorative veneer was heated and pressed at 140 to 150° C. using a Yuria adhesive on a base plate (plywood, 4#) to obtain a decorative plywood.

This heating and pressure treatment hardens the melamine-yellow resin in the mixed adhesive, improving the water resistance and crank resistance of the decorative veneer.

As a result, decorative plywood with excellent water resistance and crank resistance could be obtained.

Example 2 Lauan veneer with a moisture content of 15-20% (thickness 0.8 rrv
n) and add 100 parts of rubber emulsion (
Product name: Nisudyne A 110, manufactured by Tanesui Kagaku Co., Ltd.) and 20 parts of phenolic resin (Product name: Oshika Shigin D-424,
Brown dye Y1% in mixed adhesive (manufactured by Daijin Shinkosha)
The added material was applied.

A decorative plywood was obtained in the same manner as in Example 1 except for the above.

Does this decorative plywood have the same satisfactory performance as Example 1? had.

Example 3 A rubber adhesive (trade name: Cemedine 540, manufactured by Cemedine) was applied to a lauan veneer (moisture content: 8-12%, thickness: 0.8 rrvn) that had been previously dyed in brown, light yellow, etc.
100 parts and 25 parts of Novolanc type phenol 1m fat-hexamethylenetetramine mixture? Added dissolved adhesive and applied it.

A decorative plywood was obtained in the same manner as in Example 1 except for the above.

This decorative plywood also had the same performance as Example 1.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams of the manufacturing process of an embodiment of the present invention. 1.2... image type, 3... flitch.

Claims (1)

[Claims] 1. A two- or three-component adhesive consisting of a thermoplastic resin and/or rubber and a thermosetting resin is applied to each of a plurality of veneers, and the thermosetting resin in the adhesive is The veneers are laminated and bonded in a flexible state that is not completely cured to create a clinch, and then sliced to form a veneer, which is then heat treated to completely cure the thermosetting resin to increase the rigidity of the adhesive. A method for producing a decorative veneer, which is characterized by an increased number of features. 2 Apply an adhesive containing thermosetting resin as a main component to each of the plurality of veneers to keep it in an uncured state of stage 7 or C at room temperature, and bring the thermosetting resin to a flexible state of stage B or C. The veneers are laminated and bonded to form a flinch, and then sliced to form a veneer, which is then heat treated to completely cure the thermosetting resin and increase the rigidity of the adhesive. A method for manufacturing decorative veneer.