JPS6094304A - 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] 〔Technical field〕 This invention relates to a method for producing flitch.

[Background technology]

Generally, flitches are manufactured by placing a plurality of veneers of material between a pair of upper and lower molds having curved mold surfaces and pressing them together. The flitch manufactured in this manner is sliced into a laminated decorative veneer or the like. However, when manufacturing flitches in this way, there is a problem that it takes a long time for the adhesive to harden. High-frequency dielectric heating is applied to accelerate the curing of the adhesive while creating a flitch. That is, as shown in FIG. 1, between an upper mold 1 that also serves as an electrode for high-frequency dielectric heating, and a lower mold 2 that has a corresponding mold surface and also serves as an electrode for high-frequency dielectric heating,
Insert a material veneer laminate 3 made up of one layer of multiple material veneers,
A flitch is produced by pressing with an upper mold 1 and a lower mold 2 while applying high-frequency dielectric heating. However, in this case, a portion 4 where the electric field strength is small (the shaded portion) and a portion 5 where the electric field strength is large (the white portion) are created in the material veneer laminate 3. 4 has a low temperature, and the temperature of the portion 5 where the electric field strength is high is high, causing problems such as insufficient adhesion in the low temperature portion, resulting in poor adhesion. Therefore, in order to solve this problem, a low dielectric material 6 is stacked on the mold surfaces of the upper mold 1 and the lower mold 2 as shown in FIG. It was devised to apply high-frequency dielectric heating to the body 3 and clamp it. In this case, the electric field is made uniform by the action of the low dielectric material 6, and the temperature distribution within the material veneer stack 3 becomes uniform. However, when using the low dielectric material 6 in this way, as shown in FIGS. 3(a) to 3(c), upper molds each having an optimal shape are used to obtain a flitch with a desired shape. 1 and lower mold 2, respectively, the upper mold 1 and lower mold 2
The shape of the low dielectric material 6 had to be set to match the mold surface shape. That is, in order to obtain a flitch with a desired shape, the upper mold 1 and the lower mold 2 are set to a shape that matches the flitch, and then the low dielectric material 6 is set to the upper mold 1 and the lower mold 2.
Because it must be set to match the mold surface shape,
The number of steps was extremely large because it required a step of making the upper mold 1° and the lower mold 2, and a step of manufacturing the low dielectric material 6 accordingly.

[Purpose of the invention]

This invention aims at reducing the number of steps.

[Disclosure of the invention]

This invention uses a pair of upper and lower molds whose mold surfaces are curved and serve as high-frequency electrode surfaces, and stacks a low dielectric material on the mold surfaces of the upper and lower pair of molds, respectively, to form multiple veneers of material. This is a flitch manufacturing method in which flitch is manufactured by placing the material between a pair of upper and lower molds, applying high-frequency heating, and laminating and bonding it.The mold surface shape of the pair of upper and lower molds remains unchanged, and it is intended to be manufactured as a low dielectric material. The gist of this invention is a method for manufacturing a flitch, which is characterized by appropriately forming and using a flitch having a shape that matches the shape of the laminated surface of the flitch.

That is, the present invention leaves the mold surface shape of the pair of upper and lower molds unchanged, and uses a low dielectric material having a shape that matches the shape of the laminated surface of the flitch to be manufactured. This eliminates the need for the process of changing the mold surface shapes of the upper and lower molds to match the flitch, making it possible to reduce the number of processes.

Next, this invention will be explained in detail.

In this invention, the mold surface shapes of the upper mold 7 and lower mold 8, which also serve as high-frequency electrodes, are kept unchanged as shown in FIG. The shape of the low dielectric material 9 is changed as shown in FIG. At this time, the dielectric properties of the low dielectric material 9 that are a problem can be addressed by changing the material of the low dielectric material 9 used for each shape.

That is, according to the present invention, the mold surface shapes of the upper mold 7 and lower mold 8 are always the same, so the same upper mold 7 and lower mold 8 can be used, and only the shape of the low dielectric material 9 is changed. Therefore, the number of steps can be significantly reduced compared to the conventional example.

Next, examples will be described.

[Example 1] As shown in Fig. 6, a sinusoidal upper die (also serves as an electrode for high-frequency dielectric heating) 7 and a lower die (also serves as an electrode for high-frequency dielectric heating) 8 with a width of 360 mm and a height difference of 34 mm are made. A low dielectric material made of nylon (dielectric properties; dielectric constant: 3.2°, dielectric loss tangent: 0.02) was placed on each of these mold surfaces.
A sinusoidal low dielectric material 9 having a width of 360 mm and a height difference of 71 fins was stacked. And the thickness is 0.8~1. 'I n
A material veneer laminate 10 in which 100 + agathis destained veneers (water content 30 to 40 wt%) were laminated was placed between the two low dielectric materials 9 and pressed together while applying high frequency dielectric heating. In this case, the temperature difference between the center portion and the end portion H of the material veneer laminate 10 was (8° C.)/(80° C. on average). By the way, when the low dielectric material 9 is removed and the material veneer laminate 10 is pressed in the same way, the temperature difference between the part of the material veneer laminate 10 and H is (26°C)/(average 80°C). Ta.

[Example 2] As shown in Fig. 7, as in Example 1, a sinusoidal upper die 7 with a width of 360 mN and a height difference of 34 cranes (also serves as an electrode for high-frequency dielectric heating) and a lower die (also with a high S dielectric A low dielectric material made of glass fiber reinforced polyester resin (dielectric properties; permittivity: 5.3; dielectric loss tangent: 0.026) is placed on each mold surface. A sinusoidal low dielectric material 9 having a width of 360 mm and a fin height difference of 57 mm was stacked. Then, a material veneer laminate 10 made by laminating 100 destained agathis veneers (moisture content 30 to 4 Qwt%) having a thickness of 0.8 to 1.2 fins is inserted between the two image dielectrics 9. Pressing was performed while applying high-frequency dielectric heating. In this case, the temperature difference between the center part and the end part H of the material veneer laminate 10 is as follows:
(6°C)/(average 80°C).

By the way, when the low dielectric material 9 is removed and the material veneer laminate 10 is pressed in the same way, the portion of the material veneer laminate 10 and H
The temperature difference was (19°C)/(80°C on average).

As is clear from the comparison between Examples 1 and 2, the upper mold 7 and lower mold 8 of the same shape were used, and the material and shape of the low dielectric material 9 (
By changing the shape of the inner surface, the material veneer laminate 1
Flitches of different shapes can be obtained while maintaining a uniform internal temperature.

〔Effect of the invention〕

As described above, the present invention uses a pair of upper and lower molds whose mold surfaces are curved and serve as high-frequency electrode surfaces, and a plurality of low dielectric materials are stacked on the mold surfaces of the upper and lower pair of molds. This is a flitch production method in which a flitch is manufactured by placing two pieces of veneer material between a pair of upper and lower molds, applying high-frequency heating, and laminating and bonding them. In order to appropriately form and use a material having a shape that matches the shape of the laminated surface of the flitch to be manufactured, it is sufficient to change only the shape of the low dielectric constant to match the shape of the desired flitch. Therefore, it is not necessary to change the mold surface shapes of the upper mold and the lower mold as in the conventional method, and the number of steps can be reduced.

It also becomes possible to reduce material costs.

[Brief explanation of drawings]

1 to 3 are explanatory diagrams of the conventional example, FIGS. 4 and 5 are explanatory diagrams of the present invention, FIG. 6 is a manufacturing explanatory diagram of one embodiment of the present invention, and FIG. 7 is an explanatory diagram of another embodiment. It is a manufacturing explanatory drawing of an example. 7... Upper mold 8... Lower mold 9... Low dielectric 1o
...Material veneer laminate (a) (b) Figure 3 Figure 4 (C)

Claims (1)

[Claims] +1) Using a pair of upper and lower molds whose mold surfaces are curved and serve as high-frequency electrode surfaces, multiple veneers of material are stacked one above the other with a low dielectric material layered on the mold surfaces of the pair of upper and lower molds. This is a flitch manufacturing method in which the flitch is manufactured by placing the flitch between a pair of molds, applying high-frequency heating, and laminating and bonding. A flitch manufacturing method characterized by appropriately forming and using a material having a shape that matches the shape of the laminated surface.