JPS595008A - 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] This invention relates to a method for producing flitch.

Conventionally, flitches are used to manufacture laminated decorative veneers, etc.
It was manufactured as follows. That is, they were manufactured by coating a predetermined number of material veneers with an adhesive and laminating them, and then pressing the laminate with a pair of upper and lower molds to harden the adhesive. In this method, since the adhesive is cured by pressing at room temperature, the pressing takes a long time, which poses a problem in terms of productivity.

Therefore, it has been considered to use high-moisture content veneers (60 cm or more), laminate a predetermined number of veneers, and apply high-frequency dielectric heating during compaction to turn the laminate into a flitch. That is, a large number (100 to 200 sheets) of the above veneers are laminated with an adhesive, and these are stacked into a pair of upper and lower molds 2.1 and 2.2. A method was considered in which high-frequency dielectric heating was performed while the material was placed between 8 parts and pressed together. 4 is a high moisture content veneer. However, when high-frequency dielectric heating is performed in this manner, the air contained in the conduit inside the veneer 4 expands due to heating, resulting in an increase in internal pressure.
As water vapor pressure is generated due to temperature rise of 100°C or more, the water (free water) contained in the conduit inside the veneer 4 is released from the conduit port 5 on the end face of the veneer 4 as shown in Fig. 2. There was a phenomenon of being pushed outside. In this way, when the inside of the veneer 4 is rapidly raised to high temperature by high-frequency dielectric heating,
Since the moisture flows out to the outside in a short time, the moisture content of the veneer 4 after heating is extremely reduced (below 80 degrees).

As a result, dimensional changes in the veneer 40 occurred during pressing, resulting in peeling of the adhesive layer and the occurrence of local cracks. In addition, since the moisture inside the veneer 4 is extremely reduced and the resulting flitch becomes rigid, when slicing the flitch,
It also required the effort of adding water to make it soft.

This invention was developed in consideration of these circumstances, and consists of laminating veneers with adhesive, placing them between a pair of upper and lower molds each having a high-frequency electrode on the mold surface, and applying pressure to the high-frequency dielectric. This is a method of adhering and flitching by heating, and is characterized by sealing the conduit opening on the end face of the veneer to prevent moisture from evaporating from the conduit opening during high-frequency dielectric heating. .

That is, this invention fills and seals the conduit opening on the end face of the veneer with epoxy resin, urethane resin, etc., thereby preventing moisture from evaporating from the conduit opening during high-frequency dielectric heating. This will prevent the water content from decreasing, preventing the above-mentioned problems from occurring.

Next, the present invention will be explained based on examples. That is, as shown in FIG. 3, the conduit port 8 on the end face of the veneer 7 is closed with epoxy resin, urethane resin, or the like. This blockage is
This may be done by dipping the end face of the veneer 7 into the resin and allowing the resin to enter the conduit port 8 by a predetermined distance, or by applying the resin. Next, adhesive is applied to the veneer 7 with the conduit port 8 blocked in this way, and a plurality of veneers (for example, 100 to 200 veneers) are laminated.
This is placed in a pair of upper and lower molds to and tt, each of which has a high-frequency electrode plate 9 on its mold surface, as shown in FIG. In this case, as the high-frequency electrode plate 9, one that is considerably shorter than the length of the veneer 7 is used as shown in the figure, so that the end of the veneer 7 is not heated (if the end is heated, the inside of the conduit port 8 is It is preferable to take into consideration that the resin may easily flow out. Next, the high-frequency electrode plate 9 is operated to perform high-frequency dielectric heating while pressing the laminate using the pair of molds 1O111. the result,
Hardening of the adhesive is accelerated, and the laminate becomes flitch due to short-term compression.

In this case, since the conduit port 8 on the end face of the veneer 7 is closed, moisture is prevented from flowing out, and the dimensional change of the veneer 7 does not occur. Therefore, peeling of the adhesive layer and generation of cracks due to dimensional changes in the veneer 7 do not occur, and a good flitch can be obtained.

As described above, the present invention involves laminating veneers using an adhesive, placing the veneers between a pair of upper and lower molds each having a high-frequency electrode on the mold surface, and applying high-frequency dielectric heating while applying pressure. This is a flitching method that seals the conduit opening on the end face of the veneer to prevent moisture from evaporating from the conduit opening during high-frequency dielectric heating, which can prevent dimensional changes in the veneer due to moisture evaporation. . Therefore, poor adhesion and cracks caused by dimensional changes in the veneer are prevented, and a good flitch can be obtained.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams of the technology underlying this invention, Figure 8 is a partially enlarged view of a veneer used in an embodiment of this invention, and Figure 4 is an example of this invention (5 ) It is an explanatory diagram of an example. 7... High moisture content veneer 8... Conduit port 9... High frequency electrode plate TO, TT... type patent applicant Matsushita Electric Works Co., Ltd. agent Patent attorney Takehiko Matsumoto (6)

Claims (1)

[Claims] (1) A method in which veneers are laminated with an adhesive, and then placed between a pair of upper and lower molds each having a high-frequency electrode on the mold surface, and bonded and flitched by high-frequency dielectric heating while applying pressure. A method for manufacturing a flitch characterized by sealing the conduit opening on the end face of the veneer to prevent moisture from evaporating from the conduit opening during high-frequency dielectric heating.