JPS595005A - 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 The present invention relates to a method for manufacturing a 7-rich product used for manufacturing laminated decorative veneers and the like.

Conventionally, 7rich was manufactured by applying adhesive to a large number of veneers of material, laminating them, and pressing the laminate with a pair of upper and lower molds 1.2, as shown in Figure 1. It had been. However, when pressing in this way, when the number of laminated material veneers 3 increases, some of the material veneers 3 may become loose, as shown in the area A surrounded by the dotted line and the area B surrounded by the dotted line in FIG. The plate 3 is no longer exposed to the mold surface of the mold 1.2, and within the resulting 7 rich portions, the raw material veneer 3 is bent in a manner different from the mold surface. In other words, the part A surrounded by the dotted line
Now, the material veneer 3 is in a straight line, and the part B surrounded by the dotted line
In this case, the material veneer 3 becomes wavy. When a laminated decorative veneer is manufactured by slicing 7-rich wood having such parts A and B, the wood grain from the 7-rich part above the above-mentioned part A will be as shown in Figure 2. A laminated decorative veneer 4 with a pattern is obtained, but from the above part A,
Compared to the wood grain pattern in Fig. 2, a laminated decorative veneer 5 (Fig. 3) with no wood grain in the central board part is obtained, and from the above part B, compared to the wood grain pattern in Fig. 2, a laminated decorative veneer 5 (Fig. A laminated decorative veneer 6 (FIG. 4) with a small number of grains in the straight-grained part can now be obtained, and a problem has arisen in that a laminated decorative veneer with the initially set wood grain pattern cannot be obtained.

Further, when pressing, the average pressing pressure is the highest, which causes adhesion failure, and furthermore, the pressing takes a long time (8 hours for 600 sheets), which is another problem.

This invention was made in view of the above circumstances, and a plurality of veneers are divided by 74% to form a plurality of small pieces, and these small pieces are curved in shape. They are placed in a stacked state between a pair of upper and lower molds and pre-compressed, and after the pre-compression is completed, the sets are placed in a stacked state between the above-mentioned molds or qualitatively identical molds. This is a 7-rich manufacturing method in which flitching is achieved by inserting the material and final pressing, with preliminary pressing performed using a heat press or using high-frequency dielectric heating, and main pressing using high-frequency dielectric heating. This is its characteristic.

In other words, by dividing multiple material veneers into small pieces and pre-pressing them before the main pressing, each material veneer is bent along the mold surface and the pressing pressure is applied uniformly. It becomes like this. Furthermore, by applying high-frequency dielectric heating during pre-pressing and during main-pressing, the pressing time can be significantly shortened.

Next, this invention will be explained in detail based on an example.

That is, a plurality of raw material veneers are divided into predetermined number of pieces, and the plurality of pieces are made into groups. In this case, the number of pieces is set so that each material veneer is bent along the mold surface and pressure is applied uniformly.

For example, the number of images is set from several to a hundred or more. next,
This small portion is pre-pressed for each set. In this case, the preliminary pressing is performed using a hot press (for example,
100° C.) or by using high-frequency dielectric heating. When pre-pressing is performed using high-frequency dielectric heating, for example, as shown in FIG.
An aluminum lower mold 9 is placed on top of the aluminum carrier plate 8, and on top of this lower mold 9, the divided material veneer 10 is laminated with an adhesive. Then, an upper mold 12 having a negative electrode plate 11 made of aluminum on the mold surface is placed on top of the upper mold 12, and while pressurized at a pressure of about 5 to 30 K61/cd, the electrode plate 7.11 is operated to generate high-frequency dielectric heating. This is done by accelerating the curing of the applied adhesive. Note that the lower mold 9 may be of the same type as the upper mold 12. Also, the adhesive used is at a relatively high temperature (4
A material that has a fast curing speed at temperatures of 0 to 100°C and has a considerable adhesive strength (15 to 30 Kg/lyl') is used. An example of such adhesive is urethane adhesive KU7091 manufactured by Takeda Pharmaceutical Company.

As described above, the pre-pressed small portions are assembled (book).
A plurality of sets are stacked and finally pressed together. In this case, the adhesion between the books can be achieved, for example, by inserting a material veneer 14 coated with adhesive on both sides between the books 13, as shown in FIG. Nozzle 15 on the surface of
As shown in Fig. 8, the adhesive 18 made into a film between a pair of rolls 16 and 17 is placed on the book 13, and then it is molded with a pair of upper and lower molds. This is done by applying pressure. In this way (5) In order to shorten the pressing time during the final pressing, as shown in FIG. At the same time, a positive electrode 20 is applied to the part of the adhesive layer 19 on the other side of the book 13, and a negative electrode 21 is applied to the part of the adhesive layer 19 on the other side of the book 13, and final pressing is performed using a pair of upper and lower molds 22 and 23 using high frequency dielectric heating. It will be done. In this case, a plurality of books 13 may be adhered one after another, or may be adhered all at once. In this way, by applying high-frequency dielectric heating during the main pressing, curing of the adhesive is significantly accelerated, and the pressing time can be significantly shortened.

Note that the high frequency dielectric heating method is not limited to the above method.

In this invention, in order to manufacture 7-rich as described above, each material veneer is cured and bent on the mold surface, and some of the material veneers are curved on the mold surface as in the past. This will prevent a situation where the curve is not created in accordance with the above. As a result, laminated decorative veneers with the expected wood grain pattern can be obtained from any part of the 7-rich sheet.In addition, since the pressing is done sufficiently uniformly, there may be areas with poor adhesion. In addition, the preliminary compaction is performed using a heat press or high-frequency dielectric heating, and the main compaction is performed using high-frequency dielectric heating.
The curing of the adhesive becomes significantly faster, making it possible to significantly shorten the pressing time.

Next, examples will be described.

〔Example〕

Agatis veneer (30,3C++lX 242.4CII
X1. 0m thick) were divided into 50 sheets, coated with urethane adhesive (KU7091 manufactured by Kurade Pharmaceutical Co., Ltd.), and laminated.
/ci for 5 minutes (using high-frequency dielectric heating) and made into a book. Next, put these two sets of books into the sixth set.
As shown in the figure, the veneers are laminated with adhesive applied on both sides, and using a device such as that shown in Figure 9, the clamping pressure is 1.
54/cj for 5 minutes to bond (using high-frequency dielectric heating), and then the books were stacked one after another, and a total of 12 books were bonded in 2 hours to obtain a flitch.

[Brief explanation of drawings]

1 to 4 are explanatory diagrams of a conventional example, and FIGS. 5 to 9 are detailed explanatory diagrams of the present invention. 7... Positive electrode plate 9... Lower mold 10... Material veneer 11... Negative electrode plate 12... Upper mold 13... Book 19... Adhesive pigeon 20...・
Positive electrode 21...Minus electrode 22...Upper mold
23...lower mold patent applicant Matsushita Electric Works Co., Ltd. agent Patent attorney Takehiko Matsumoto Figure 3 Figure 2 Figure 4 Figure 5 Figure 7 Figure 6 Figure 8 Figure 2

Claims (1)

[Claims] (1) Divide multiple pieces of veneer material into small pieces to make sets, and put these sets in a stacked state between a pair of upper and lower molds with curved mold surfaces to reserve them. After pressing and pre-pressing, the plurality of small pieces are put in a stacked state between the above-mentioned molds or substantially the same molds and are finally pressed to make them 7. 1. A flitch manufacturing method, characterized in that preliminary pressing is performed by a hot press or by using high-frequency dielectric heating, and main pressing is performed by using high-frequency dielectric heating.