JPS58191111A - Manufacture of flitch - 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] [Objective] The object of the present invention is to improve the flitch manufacturing method when manufacturing a flitch as an intermediate product when manufacturing a laminated decorative veneer. Specifically, the object is to provide a method for manufacturing a flitch that has less variation in clamping pressure that causes material breakage and poor adhesion.

[Background technology] The manufacturing method for so-called laminated decorative veneers involves preparing raw material veneers, stacking them with adhesive intervening, and sandwiching them between molds with uneven surfaces and pressing them together to form a free 7-chi. ,
And this was by slicing.

In the above case, the raw material veneer has a constant thickness, and the concave-convex plate used to stack and press the veneers to integrate them and form flitches has a curved surface with a predetermined curvature, so the load during pressing is The amount of water applied will vary depending on location. That is, in the case of a mold plate as shown in FIG. 2, which will be explained later, the load on both sides is larger than the load on the center part. Therefore, shear is applied inside the flitch, causing material failure.

Furthermore, since the load at the center was small, poor adhesion and pattern deformation occurred. This invention was made in view of the above circumstances.

[Disclosure of the Invention] This invention provides raw material veneers that are prepared, piled up with an adhesive interposed, sandwiched between mold plates having uneven surfaces, and pressed together to form a flitch. It is characterized in that the thickness of the central part is made thinner than that of the central part. This will be explained below based on the drawings.

FIG. 1 is a perspective view for explaining the form of a raw material veneer 1 used in the present invention. In other words, the corner portions 2 on both sides of the veneer are cut down to form a veneer 1 having a substantially trapezoidal edge face.

The raw material veneers used in the production of decorative veneers are usually rectangular strips. Therefore, by carving the corners of both ends in the longitudinal direction with a plane, for example, the veneer is made into a veneer with trapezoidal edges as described above. The amount to be removed depends on the curvature of the mold and the number of stacked raw material veneers, but this can be designed by calculation. That is, the curvature of the mold plate and the curvature of the upper surface and the curvature of the lower surface of the laminated raw material veneers may be designed to be approximately the same.

FIG. 2 is a diagram showing the process of manufacturing the flitch. Here, 3 is a mold board. The adhesive veneers are stacked and placed between the mold plates 3 and pressed together. Note that an adhesive is interposed between each raw material veneer to integrate each raw material veneer.

The type of adhesive used here, the conditions for pressing, etc. are based on conventionally known techniques.

Examples will be described below.

Example 1 Agatis was used as the tree species, and a veneer having a uniform thickness of 1 mm was prepared from this. The mold has a bridge-shaped curved surface with a sinusoidal shape (26.6° at the end of the mold),
A flitch was manufactured by laminating and pressing 50 veneers using a lower mold board. Here, the molding pressure was 15 kg/c+j, and a urethane adhesive was used.

The pressure variation in the veneer without edge cutting (that is, the comparative example) was 5.6 kg/cd expressed in 1σ, and the pressure variation in the veneer with edge cutting was 1.3 kg/cd.

Example 2 A veneer having a uniform thickness of 1 mm was prepared using Labra as the tree species. A flitch was manufactured by laminating and pressing 50 veneers using upper and lower mold plates each having a bridge-shaped curved surface with a sinusoidal shape (26.6' at the end of the mold) as molds. Here, the molding pressure was 15 kg/cot, and a urethane adhesive was used.・And, for a veneer without edge cutting, the pressure variation is 1σ
Displayed as lO, 3kg/C1l! , and the one with end cutting was 2.0 kg/ffl.

Example 3 Tepa was used as the wood species, and a veneer having a uniform thickness of 1 mm was prepared from it. A sinusoidal shape (
A flitch was manufactured by laminating and pressing 50 veneers using upper and lower mold plates having a bridge-shaped curved surface of 26.6° at the mold end. Here, the molding pressure is 20 kg/'ctl,
Urethane adhesive was used.

And, for a veneer without edge cutting, the pressure variation is 1σ
16.3 kg/cry, 2.3 kg/cry for those with end cutting. ．． 61g/a+! Met.

[Effects] The present invention is a method for producing flitches for producing laminated decorative veneers, in which raw veneers are prepared, the veneers are laminated with an adhesive interposed therebetween, and the veneers are sandwiched between molds having uneven surfaces and pressed together to form a single piece. hand,
The raw material veneer is characterized in that the thickness at both ends thereof in the longitudinal direction is thinner than the central part, so that variations in pressure distribution that cause flitch adhesion failure, material cracking, pattern deformation, etc. are avoided. The effect of reducing

[Brief explanation of the drawing]

FIG. 1 is a veneer perspective view for explaining the form of the raw material veneer used in this invention, and FIG. 2 is a diagram for explaining the flitch manufacturing process. 1... Raw material veneer 2... Cutting section of the veneer 3... Mold patent applicant Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] (1) A method for producing a flitch for producing a laminated decorative veneer in which raw veneers are prepared, laminated with an adhesive interposed therebetween, and then sandwiched between molds having uneven surfaces and pressed together to form a single piece, comprising: A flitch manufacturing method characterized by using a raw material veneer in which the thickness at both ends in the longitudinal direction is thinner than at the center.