JPS5978801A - Manufacture of aggregate veneer - 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] [Technical Field] This invention belongs to the field of so-called veneer assembly technology. More specifically, it belongs to the field of laminated veneer manufacturing technology for obtaining high-grade precious wood veneers from relatively low-grade logs.

Background technology] (1) Conventionally, in the production of laminated veneers, adhesive is applied to raw material veneers, which are then sandwiched between molds with uneven curved surfaces, pressed together, and integrated to form a flitch. Next, this flitch was sliced into the desired laminated veneer.

This manufacturing process will be explained with reference to the drawings.

FIG. 1 is a process diagram showing a conventional manufacturing process. In this figure, 1 is a roll coater, 2 is a veneer, and 3 is an adhesive. First, when a raw material veneer 2 is prepared, an adhesive 3 is applied thereto using a roll coater 1.

Next, an appropriate number of layers are laminated. This laminate 4 is normally placed on a mounting table and waits for the pressing process before being subjected to the pressing process.

The laminate 4 is then subjected to a pressing process. The mold board for clamping is a mold board 6 having an uneven curved surface.

When it is clamped between mold plates 6 having an uneven curved surface, a flitch shown as 7 is obtained. If you take this out and slice it, you will get the desired laminated veneer.

However, when observing the flitch 7 obtained through the pressing process, as shown in Fig. 2, not all of the veneers were formed along the curved surface 5 of the mold (2) board, but instead they were formed near the center layer. The shape of the veneer A is maintained almost horizontally, or even the veneer is observed to deform in the direction opposite to the curved surface of the template at the end B of the flitch. In such a state, various fringe defects occur. For example, the adhesive interface of the raw material veneer peels off (referred to as frisotiro cracking), the flitch is deformed due to spring banks due to residual stress generated inside the flitch, and when the obtained flitch is sliced, the wood grain becomes disordered and does not match the design. This resulted in defects such as not being able to obtain the wood grain (pattern distortion).

[Object of the invention] This invention was made in view of the above-mentioned circumstances.
To make it possible to mold all raw material veneers included in a laminate along the curved surface of a mold plate having an uneven curved surface, thereby reducing the occurrence of flitch defects.

[Disclosure of the Invention] This invention applies an adhesive to the surface of the raw material veneer, and laminates a predetermined number of veneers for pressing (3). It is characterized by adjusting the shape of the object before pressing it. A detailed explanation will be given below with reference to the drawings.

In this invention, the key point is to adjust the shape of the laminate so that it conforms to the lower mold surface of the clamping die, as mentioned above, and various specific methods can be considered for achieving this. In short, it is thought that it is necessary to shape the laminate into a shape that conforms to the surface of the lower mold without applying too much pressure.

FIG. 3 shows a specific method as an example. That is, in this figure, reference numeral 8 denotes a mounting table for the laminate 9, and the surface shape of this mounting table 8 is approximately the same as the lower mold surface of the mold board 6, which has an uneven curved surface. When raw material veneers coated with adhesive are stacked and placed on this mounting table 8, the laminate warps over time and forms on the surface of the mounting table 8, forming a shape similar to a flitch. Next, when the laminate prepared in such a shape is sandwiched between mold plates 6 having uneven curved surfaces and pressed, a flitch without the above-mentioned defects is obtained (4). If the laminate is pressed suddenly without being shaped on such a mounting table, the laminate will be pressed before it has adapted to the mold surface, resulting in uneven applied pressure, which may lead to the above-mentioned defects. Become.

FIG. 4 is a diagram showing another implementation, and the feature in this case is that the mounting table 10 is split in the middle and opened to both sides. Of course, the upper surface of the mounting table 1o needs to satisfy the above conditions. The reason why the mounting table 10 is split and opened to both sides is that it is convenient for moving the laminate 11 onto the mold plate 6 having an uneven curved surface, as shown in FIG. 4 (b). It is. The means for opening the mounting table 1o to both sides in this manner can be realized by conventionally known mechanical elements.

In the previous explanations, I explained that you should not apply too much pressure to make the stacked material placed on the mounting table conform to the surface of the mounting table. Be free. For example, you can use a roller to trace over the laminate, or you can lightly press only the center (5).

Example: A 0.8 mm thick raw material veneer (agathis) was coated with urethane adhesive, the veneer laminate was placed on a mounting table with a different curvature, and the shape was adjusted. A flitch was created by sandwiching and pressing between mold plates having an uneven curved surface.

The mold surface of the mold plate having an uneven curved surface had a sinusoidal curve and an end angle of 26.6°. Clamping pressure is 10
kg/c+J, and the pressing time was 15 minutes.

The curved surface of the mounting table has two types with an end angle of 16.7° and 26.6°, which have a sinusoidal curve, and a third type of mounting table with a flat plate surface (end angle 0') for comparison. I used seeds. In addition, the top of the laminate was lightly pressed using a roller so that it would conform to the surface of the mounting table.

The flitch obtained as described above was sliced to obtain a laminated veneer.

When the results of the experiment were examined in terms of spring bank, pattern breakage (6), and frisotiro cracking, the above characteristics improved in the order of end angles of 0°, 16.7°, and 26.6°.

[Effects of the Invention] As explained above, the present invention applies adhesive to the surface of raw material veneers, laminates a predetermined number of veneers for pressing, and
The feature is that the shape of the laminate is adjusted so that it conforms to the lower mold surface of the pressing mold before it is subjected to pressing, so it is free and easy to use.
The effect of reducing notch defects was obtained.

[Brief explanation of the drawing]

Figure 1 is a process diagram for explaining the conventional pressing process, Figure 2
The drawings are diagrams for explaining the conventional clamping state, FIG. 3 is a diagram for explaining the present invention in detail, and FIG. 4 is a diagram showing another embodiment. 1 is a roll coater 2 is a raw material veneer 3 is an adhesive 4 is a laminate of veneers 5 is a mounting table (7) 6 is a mold plate 7 having an uneven curved surface is a flitch 8 is a mold plate 9 having an uneven curved surface is a raw material veneer The board laminate 10 is a laminate of raw material veneers.Patent applicant: Matsushita Electric Works Co., Ltd. Patent attorney Toshimaru Takemoto (and 2 others) (8) 3-

Claims (1)

[Claims] (1) Prepare a raw material veneer, press it between pressing molds with an uneven curved surface with an adhesive interposed, and integrate it to create a flitch, which is then sliced to form a composite sheet. In the method of manufacturing laminated veneers used to manufacture boards, adhesive is applied to the surface of the raw veneers, and a predetermined number of veneers are laminated to be pressed together, and the shape is shaped to follow the bottom surface of the pressing die. A method for producing laminated veneer, which is characterized by adjusting the shape of the laminate and then subjecting it to compaction.