JPS63197631A - Simultaneous vacuum molding and high frequency welding method - Google Patents

Abstract

PURPOSE:To reduce spark inferiority and to shorten a processing time, by applying high frequency welding to the required area of the superposed part of a plurality of sheets immediately after vacuum molding at the high temp. time of said sheets by an electrode held to a non-heating state. CONSTITUTION:At first, the edge parts of a foamed synthetic resin sheet 21 are clamped by clamp devices 15. Next, a heating device 14 and the clamp devices 15 are relatively moved and the foamed synthetic resin sheet 21 is heated by the heating device 14. Subsequently, a fiber sheet 22 is arranged at a predetermined area and a base material 11 coated with an adhesive 23 is placed on a vacuum mold 12. Next, the vacuum mold 12 is raised toward the foamed synthetic resin sheet 21 held by the clamp devices 15 and a lid 13 is allowed to fall to perform vacuum molding. Next, an upper side electrode 32 falls from the lid 13 to perform high frequency welding processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is used when vacuum forming a plurality of sheets including a foamed synthetic resin sheet and high-frequency welding the plurality of sheets.

[Prior Art] Foamed synthetic resin sheets have a low density, so they cannot be welded by ordinary high-frequency welding. For this reason, high frequency welding was performed while heating the electrodes of the high frequency welder to 60 to 80° C. using a built-in heater.

[Problems to be Solved by the Invention] A foamed synthetic resin sheet may be processed by vacuum forming to obtain a three-dimensional curved surface. Then, a fiber sheet is placed between the foamed synthetic resin sheet and the base material (a three-dimensional plate-like material made of a material containing at least synthetic resin as a raw material with ventilation, and also includes synthetic wood) and welded. There are cases.

The present invention is intended to enable welding in such cases without heating the electrodes.

[Means for Solving the Problems] The simultaneous high-frequency welding method for vacuum forming according to the present invention is applicable when vacuum forming a stacked portion of a plurality of sheets including foamed synthetic resin sheets using a vacuum forming machine. This method performs high-frequency welding of the required portions of the stacked portion using unheated electrodes when the sheet is at high temperature.

[Function] When vacuum forming the required parts of the piled up portion of multiple sheets including foamed synthetic resin sheets, they are heated to around 130°C and the heat capacity of the multiple sheets is large. Therefore, the lower side of the vacuum forming machine is The lower electrode is installed internally, and the upper electrode is brought in immediately after vacuum forming, and multiple sheets,
Complete welding can be achieved by performing high frequency welding at high temperatures.

- [Example] The clamping device 15 is adapted to clamp the edge of a foamed synthetic resin sheet 21.

The base material 11 is placed on the vacuum forming mold 12 located below the clamping device 15, and there is a hole in the vacuum forming mold 12 that does not come into contact with the lower side of the placed base material 11. A lower electrode 31 that can be used is built-in. 16 is a vacuum pump.

A lid 13 that can be raised and lowered is disposed on the vacuum forming mold 12 with a distance that the clamping device 15 fits in, and an upper electrode 32 that can be lowered is disposed within the lid 13. .

The heating device 14 is located next to the clamping device 15.

Next, the operation of the embodiment will be explained.

■ The edge of the foamed synthetic resin sheet 21 is clamped by the clamping device 15.
grab by.

(2) After the heating device 14 and the clamp device 15 are moved relatively to the state shown in FIG. 3, the foamed synthetic resin sheet 21 is heated by the heating device 14. (in this case,
A case where the clamping device 15 is stationary and the heating device 14 moves laterally as shown in FIG. 2, and a case where the heating device 14 is stationary and the clamping device 15 moves laterally as shown in FIG. There are two methods. )■ As shown in FIG. 2, the base material 11 with the fiber sheet 22 arranged at a predetermined portion and the adhesive 23 applied to the upper surface is placed in the vacuum forming mold 1.
Place it on 2.

(Instead of placing the fiber sheet 22 at a predetermined location on the base material 11, the fiber sheet 22 may be set on the lower surface of the upper electrode 32 as shown in FIG. 4.) ■ Foamed composite material held by the clamp device 15 The vacuum forming mold 12 is raised toward the resin sheet 21, and the M2
S descends.

■ Vacuum forming process.

(2) The upper electrode 32 is lowered from inside the lid 13 and high-frequency welding is performed. [A knife (not shown) may be fixed to the upper electrode 32 to cut unnecessary parts at the same time as welding. ] ■ Lid 13 goes up and the clamp is released.

■ Take out the finished product.

■ The vacuum molding mold descends.

[Effects of the Invention] According to the present invention, there is no need to specially heat the electrodes 31 and 32, so the power required for high frequency welding can be reduced.

In addition, as a result of experiments, it is difficult to generate sparks during welding, and there are fewer defects in multiple sheets due to sparks (in addition, processing time is shortened and equipment costs are reduced).

[Brief explanation of the drawing]

Figures 1 to 3 show the first embodiment; Figure 1 is a vertical cut front view of the whole during vacuum forming, Figure 2 is a vertical cut front view of the whole in an exploded state, and Figure 3 is a vertical cut front view of the whole in an exploded state. The figure is a vertically cut front view of a portion showing the state during heating. FIG. 4 is a vertically sectioned front view of the entire second embodiment in an exploded state. 11 Base material 12 Vacuum forming mold 13 Lid 14 Heating device 15 Clamping device 16 Vacuum pump 21 Foamed synthetic resin sheet 22 Fiber sheet 23 Adhesive 31 Lower electrode 32 Upper electrode Patent Applicant Nanjo Equipment Industry Co., Ltd. Representative
Person Patent Attorney Furu 1) Kei Tsuyoshi Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] When vacuum forming a stacked part of multiple sheets including foamed synthetic resin sheets using a vacuum forming machine, high frequency is applied to the desired parts of the stacked part using unheated electrodes when the multiple sheets are at high temperature immediately after vacuum forming. A vacuum forming and simultaneous high frequency welding method characterized by welding.