JPS6227655B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a pass case for holding documents, notes, etc., which is manufactured using dielectric heating.

Conventionally, a pass case 1 as shown in FIG. 1 includes upper and lower synthetic resin plates 3, 4 made of transparent or colored hard vinyl chloride, and
It is formed from a crosspiece 5 made of transparent or colored hard or soft vinyl chloride with an opening 6 interposed between the two peripheral edges, and the manufacturing method thereof is as follows.
It was manufactured by welding the upper and lower synthetic resin plates 3, 4 and the crosspiece 5 using dielectric heating.

Specifically, as shown in FIG. 2, a lower synthetic resin plate 4,
Pass case material 2 consisting of crosspiece 5 and upper synthetic resin plate 3
The upper synthetic resin plate 3 is arranged with a crosspiece 5 interposed therebetween.
The movable electrode 8 was pressed from above, a high frequency voltage was applied to the electrode surface plate 7 and the movable electrode 8, and the upper and lower synthetic resin plates 3, 4 and the crosspiece 5 were welded together.

Therefore, in the conventional manufacturing method, the lower synthetic resin plate 4, the crosspiece 5, and the upper synthetic resin plate 3 are sequentially arranged on one electrode 7, and the upper synthetic resin plate 3 on which the crosspiece 5 is arranged
It is manufactured by pressing the other electrode 8 from above, and normally the welding cannot be performed sufficiently unless the pressing force of the electrode 8 is about 5 kgf, so a dent may be formed in the welded part of the manufactured pass case. This caused problems such as warping of the synthetic resin board.

This invention solves the above problems.
To provide a method for manufacturing a pass case that can be manufactured using dielectric heating with a good appearance without causing dents in the welded parts of the pass case to be manufactured or warping in the synthetic resin plate. With the goal.

The gist of this invention is to use a surface plate having a recess corresponding to the external shape of the pass case, and to leave an opening between two upper and lower synthetic resin plates facing each other in the recess and the periphery of the upper and lower synthetic resin plates. In a method for manufacturing a pass case, in which a pass case material consisting of a synthetic resin crosspiece is arranged and the upper and lower synthetic resin plates and the crosspiece are welded by dielectric heating, the pass case material is arranged on the inner circumferential surface of a concave part of the surface plate. Using an outer electrode that contacts the side surface of the material and an inner electrode that contacts the inner peripheral surface of the crosspiece,
Upper and lower synthetic resin plates, crosspieces, and inner electrodes are placed in the recess of the surface plate, and a push plate is placed on the upper synthetic resin plate to prevent the upper synthetic resin plate from shifting, and a high-frequency voltage is applied to the outer and inner electrodes. The method of manufacturing a pass case is characterized in that the upper and lower synthetic resin plates and the crosspiece are welded together by applying a

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 3 is a perspective view of a welding device used in an embodiment of the present invention, and FIGS. 4 and 5 are partial sectional views sequentially showing manufacturing steps in the same embodiment.

As shown in FIGS. 3, 4, and 5, the welding device used in the example includes a surface plate 10 made of an insulating material such as polyacetal that has higher heat resistance than the pass case material 2, and an inner electrode made of brass or the like. 18, and a push plate 19 made of an insulating material that is more heat resistant than the pass case material 2 and similar to that of the surface plate 10.

The surface plate 10 is provided with a recess 10a corresponding to the external shape of the pass case 1, and the inner peripheral surface of the recess 10a is provided with a recess 10a that corresponds to the outer shape of the pass case 1. Outer electrodes 17, 17 are arranged to abut on the side surfaces of the resin plates 3, 4, respectively.

In addition, the inner electrode 18 is sized so that when the lower synthetic resin plate 4 is arranged in the recess 10a and then the inner electrode 18 is arranged, a gap can be formed in the surface plate recess 10a into which the crosspiece 5 can be fitted. It is disposed so as to be able to be inserted into and taken out from the board recess 10a, and is formed to be slightly thinner than the crosspiece 5 disposed in the recess 10a in consideration of the fact that the crosspiece 5 melts and becomes thinner during welding.

The push plate 19 is provided with an upper synthetic resin plate to prevent the upper synthetic resin plate 3 from shifting during welding when the pass case material 2 consisting of the upper and lower synthetic resin plates 3, 4 and the crosspiece 5 and the inner electrode 18 are arranged in the recess 10a. The resin plate 3 is arranged so that substantially the entire surface can be pressed down.

Next, using the above device, pass case 1
The manufacturing process will be explained.

First, the lower synthetic resin plate 4 having a thickness of approximately 0.4 mm is placed in the surface plate recess 10a, and then the inner electrode 18 is placed.

After that, insert the crosspiece 5 with a thickness of about 1.0 mm into the recess 10a.
(See FIG. 4).

Then, on the crosspiece 5 and the inner electrode 18, a thickness of approximately
An upper synthetic resin plate 3 of approximately 0.4 mm is placed, and a push plate 19 is placed to prevent the upper synthetic resin plate 3 from shifting during welding.
is placed and presses substantially the entire surface of the upper synthetic resin plate 3 with a pressing force of about 1 to 2 kgf (see Fig. 5).

Thereafter, a high frequency voltage is applied to the outer electrode 17 and the inner electrode 18 to weld the upper and lower synthetic resin plates 3, 4 and the crosspiece 5.

After welding, the push plate 19 is removed, the inner electrode 18 is pulled out from the opening 6 of the pass case 1, and the pass case 1 is taken out.

Therefore, in the manufacturing method of the embodiment, the outer electrode 17 and the inner electrode 18 are arranged approximately parallel to the welding surface between the upper and lower synthetic resin plates 3, 4 and the crosspiece 5, and the welding surface is concentrated near the welding surface. The upper and lower synthetic resin plates 3 and 4 can be melted, and the upper and lower synthetic resin plates 3 and 4 can be melted with just a low pressing force that does not displace the upper synthetic resin plate 3.
and the crosspiece 5, and unlike the conventional method, the electrode 8 is not welded by pressing the electrode 8 from above the upper synthetic resin plate 3 on which the crosspiece 5 is arranged with a pressing force of about 5 kgf.
Pass case 1 has a good appearance, with no dents in the welded parts or warping of the synthetic resin plates 3 and 4.
can be manufactured.

In the embodiment, the inner electrode 18 is arranged after the lower synthetic resin plate 4 is arranged in the recessed part 10a of the surface plate, but after the lower synthetic resin board 4 is arranged in the recessed part 10a, 5 or after further arranging the upper synthetic resin plate 3, push plate 19, etc., the inner electrode 18 may be placed in contact with the inner circumferential surface of the crosspiece 5.

In addition, although the embodiment shows that the crosspieces 5 are arranged on three sides, it is of course possible to arrange them on two sides.

Further, another embodiment of the surface plate is shown in FIG. 6, and this surface plate 20 is similar to the surface plate 1 shown in FIGS. 3, 4, and 5.
In addition to the recess 20a being formed from the same material as 0, the outer electrode 27 disposed on the inner peripheral surface of the recess 20a is formed by the thickness of the pass case material, resulting in slightly higher current consumption. However, the same effect can be obtained even if this surface plate 20 is used.

The method for manufacturing a pass case according to the present invention has the structure and operation as described above, and the outer electrode and the inner electrode are arranged approximately parallel to the welding surface between the upper and lower synthetic resin plates and the crosspiece, and the welding surface The upper and lower synthetic resin plates can be melted in a concentrated manner, and the upper and lower synthetic resin plates and the crosspiece can be welded together with just a low pressing force that does not displace the upper synthetic resin plate. Since the electrodes are not welded by pressing them with a high pressure from above the upper synthetic resin plate on which the electrodes are placed, there is no depression in the welded part of the pass case or warping of the synthetic resin plate, and the pass case can be manufactured with a good appearance.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a pass case, Fig. 2 is an explanatory diagram showing a conventional manufacturing method, Fig. 3 is a perspective view of a welding device used in an embodiment of the present invention, Figs.
The figures are partial sectional views sequentially showing the manufacturing steps in the same embodiment, and FIG. 6 is a partial sectional view showing another example of the surface plate used in the same embodiment. 1...Pass case, 2...Pass case material, 3
...Top synthetic resin board, 4...Bottom synthetic resin board, 5...
Crosspiece, 6... Opening, 10, 20... Surface plate, 10
a, 20a... recess, 17, 27... outer electrode,
18...Inner electrode, 19...Press plate.

Claims (1)

[Claims] 1. A surface plate with a recess corresponding to the external shape of the pass case is used, and two synthetic resin plates facing each other in the recess are made of synthetic resin with an opening left between the periphery of the upper and lower synthetic resin plates. In the method for manufacturing a pass case, the pass case is manufactured by arranging a pass case material consisting of a crosspiece, and welding the upper and lower synthetic resin plates and the crosspiece by dielectric heating, wherein the pass case material is Using an outer electrode that contacts the side surface of the material and an inner electrode that contacts the inner peripheral surface of the crosspiece, the upper and lower synthetic resin plates, the crosspiece,
and an inner electrode are arranged, and a push plate for preventing displacement of the upper synthetic resin plate is arranged on the upper synthetic resin plate, and a high frequency voltage is applied to the outer electrode and the inner electrode to separate the upper and lower synthetic resin plates. A method for manufacturing a pass case, characterized by welding the and the crosspiece.