JPH07223260A - Method for processing thermoplastic resin molded product, structure of electrode, and apparatus for processing of thermoplastic resin molded product - Google Patents

Abstract

PURPOSE:To provide a method for processing of thermoplastic resin molded product which shortens time required for processing and improves the productive efficiency by making operation easy, an electrode structure suitable for execution of the processing method, and an apparatus for processing of the thermoplastic resin molded product. CONSTITUTION:A second electrode 2 is inserted into a vinyl chloride pipe 25, and an inside of a flexible pipe 11 is filled with an electrolyte 20. Then, the vinyl chloride pipe 25 is put in a bottom tool 1b of a mold 1, and a top tool 1a is moved downward to be conformed to the bottom tool 1b. Thereafter, inner pressure of the plastic pipe 11 is controlled at about 2.5kg/cm<2>. The vinyl chloride pipe 25 is pushed against the mold 1 side by inflation of the flexible pipe 11, and high frequency voltage is impressed under this state with a high frequency power source 3. After a specific heating time has been elapsed, it is cooled, and bending is ended.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a thermoplastic resin molded article using high frequency dielectric heating, an electrode structure suitable for use in carrying out the processing method, and a processing apparatus for the thermoplastic resin molded article.

[0002]

2. Description of the Related Art Conventionally, for example, when bending a pipe made of a soft vinyl chloride resin (hereinafter referred to as “PVC”), the pipe is preheated and a metal rod having a desired molding shape is inserted and a A method is known in which the pipe is placed in a mold and then immersed in a glycerin solution or the like at about 100 ° C., and the pipe is heated for a predetermined time and then cooled, or a pipe is heated at about 150 ° C. for a predetermined time and then cooled. There is.

On the other hand, in the adhesion processing of PVC moldings,
A method utilizing high frequency dielectric heating is known. For example, a method is known in which two vinyl chloride films are superposed on each other, electrodes are pressed from above and below, a high frequency voltage is applied between both electrodes, and the vinyl chloride films are bonded together by high frequency dielectric heating.

[0004]

However, in the conventional bending process of a vinyl chloride pipe that is immersed in a solution or the like and heated in a hot-air stove, it is necessary to heat the vinyl chloride pipe to a predetermined temperature. It took some time. There is also a problem that it is difficult to extract the metal rod from the PVC pipe after bending.

On the other hand, the bending of a vinyl chloride pipe using high frequency dielectric heating has not been known so far, but if the intention is to perform bending using high frequency dielectric heating, the PVC pipe must be preheated. A method is considered in which a metal electrode having a shape to be inserted is inserted, then this is put in a mold and a high-frequency voltage is applied between the metal electrode and the mold. Also in this case, similarly to the above, there is a problem that it is difficult to extract the metal electrode after the processing.

The present invention has been made in view of the above problems, and provides a method for processing a thermoplastic resin molded product which shortens the time required for processing and facilitates the work to improve the production efficiency, and An object of the present invention is to provide an electrode structure suitable for use in carrying out the processing method and an apparatus for processing a thermoplastic resin molded product.

[0007]

In order to solve the above-mentioned problems, the method for processing a thermoplastic resin molding according to claim 1 is
One side of the thermoplastic resin molded product is brought into contact with the mold, and the molded product is pressed against the mold from the other side of the molded product by the pressure of the conductive fluid. And a high-frequency voltage is applied between them, and the above-mentioned molded product is processed into a mold by high-frequency dielectric heating.

According to a second aspect of the present invention, there is provided a method for processing a thermoplastic resin molded product, wherein one side of the thermoplastic resin molded product is brought into contact with a mold and the other side of the molded product is fluidized through a flexible member. High-frequency dielectric heating by applying a high-frequency voltage between the flexible member or the fluid having conductivity and the mold in a state where the molded product is pressed against the mold by the pressure of the fluid. Is characterized in that the above-mentioned molded product is processed into a mold.

An electrode structure according to a third aspect of the present invention has a fluid inside, and includes a flexible portion that can be expanded and contracted by the pressure of the fluid, and at least one of the fluid and the flexible portion has conductivity. It is characterized by An apparatus for processing a thermoplastic resin molded article according to claim 4 is provided with a mold as a first electrode capable of coming into contact with one side of the thermoplastic resin molded article, and the electrode structure according to claim 3, wherein the flexible structure is provided. It is characterized in that it is provided with a second electrode whose part is arranged at a position facing the mold and a high-frequency power source for applying a high-frequency voltage between the mold and the second electrode.

The apparatus for processing a thermoplastic resin molded article may include a circulation path for circulating the conductive fluid between the inside and the outside of the flexible container.

[0011]

According to the method of processing a thermoplastic resin molded article according to claim 1, the conductive fluid acts as an electrode, and the thermoplastic resin molded article is pressed against the mold by operating the pressure of the conductive fluid. It also plays a role. Therefore, a high-frequency voltage is applied between the mold and the conductive fluid, and the molded product can be processed by high-frequency dielectric heating.

According to the method for processing a thermoplastic resin molded article of claim 2, when the flexible member has conductivity, the flexible member acts as an electrode and the fluid has conductivity. This fluid acts as an electrode when The fluid also plays a role of pressing the thermoplastic resin against the mold by controlling the pressure. Therefore, a high-frequency voltage is applied between the flexible member or the fluid having conductivity and the mold, and the molded product can be processed by high-frequency dielectric heating.

In the electrode structure according to the third aspect of the invention, the flexible portion expands / contracts due to increase / decrease in the pressure of the internal fluid, and
Since at least one of the fluid and the flexible portion has conductivity, it can act as an electrode. In the processing apparatus for a thermoplastic resin molded article according to claim 4, since the flexible portion of the second electrode is arranged at a position facing the mold as the first electrode, the pressure of the fluid inside the second electrode is When rises, the flexible part expands and presses the thermoplastic resin molded product against the mold. Further, when the pressure of the fluid is lowered, the flexible portion is contracted, and the pressing of the molded product against the mold is released. When a high frequency voltage is applied between the mold and the second electrode, a high frequency voltage is applied between the mold and the fluid or flexible portion of the second electrode having conductivity.
The above-mentioned molded product can be processed into a mold by high-frequency induction heating.

A conductive fluid is secondly applied to the second electrode.
When a circulation path that circulates between the inside and the outside of the electrode is attached, for example, in the high frequency dielectric heating, considering that the heating process is usually a few to several tens of seconds and the cooling process is relatively long, Heat treatment while circulating a cooled fluid
If the cooling process is performed, the cooling process time can be shortened. Furthermore, by circulating a preheated fluid as a pretreatment for the heat treatment, the time required for the heat treatment can be further shortened.

According to the above-mentioned invention of claim 1, 2, 4 or 5, since the molded product is processed by the high frequency dielectric heating, the molded product is heated rapidly and reaches a predetermined temperature. The mold, the fluid, and the flexible member are not heated so much as the above-mentioned molded product. Therefore, the time required for heat treatment and cooling treatment is short.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic explanatory view of the first embodiment, and FIG. 2 is an A view of FIG. 3A and 3B are perspective views of a mold and a processed product, FIG. 3A is a perspective view of a mold, FIG. 3B is a perspective view of a pipe before processing, and FIG. 3C is a perspective view of a pipe after processing. FIG. 4 is an explanatory diagram of the second electrode, (a) is an explanatory diagram of the second electrode of the first embodiment, and (b) to (h) are explanatory diagrams of other second electrodes.

The first embodiment is an apparatus 10 for bending a pipe, which is a thermoplastic molded product, and the apparatus 10 for bending is the first.
It is composed of a mold 1 as an electrode, a second electrode 2, a high frequency power source 3 and a pipe 4. The mold 1 as the first electrode is made of aluminum and is separated into an upper mold 1a and a lower mold 1b as shown in FIGS. 2 and 3A. As shown in FIG. 2, the lower mold 1b is fixed to the table 5 with screws. The upper mold 1a includes a plunger 7a of an air cylinder 7 attached to a top plate portion 6a of an outer frame 6 provided upright on a table 5.
Fixed to the tip of the air cylinder 7 while being guided by guide members 8a and 8b provided on both sides of the plunger 7a.
It moves up and down by driving. Therefore, the upper mold 1a is the lower mold 1
It is possible to contact and separate from b. The mold 1 is shown in FIG.
As shown in (a), a mold 1c having a predetermined bending shape is provided. The surface of the mold 1c may be covered with an insulating paint or an insulating film, specifically, one having a low dielectric loss factor such as a fluororesin film. In this case, the vinyl chloride pipe 25 is removed after bending. Will be easier.

The second electrode 2 includes a flexible pipe 11 and a side pipe 1.
It is composed of an outer pipe 12 and an inner pipe 13. The details will be described with reference to FIG. Flexible pipe 1
Reference numeral 1 has an outer diameter of 16 mm, a thickness of 2 mm, and an internal volume of 10 cc. Sealing portions 14 and 15 made of epoxy resin are provided at both ends, thereby sealing the inside. The outer pipe 12 with the side pipe 16 is made of copper, penetrates one seal portion 14 of the flexible pipe 11, and the inner opening 12 a reaches the inside of the pipe 11. A spring 17 made of copper is fixed near the internal opening 12a, and the spring 17 is embedded in the seal portion 15 of the flexible pipe 11. Therefore, the axial center of the spring 17 does not deviate from the axial center of the flexible pipe 11. The inner tube 13 is a silicone rubber tube, and the inner tube 13a is inserted through the outer tube 12 and the axial center of the spring 17.
Has reached the vicinity of the seal portion 15 on the lower end side of the flexible pipe 11. The inner tube 13 is fixed by a seal portion 18 made of epoxy resin provided in the outer opening 12b of the outer tube 12. The outer opening 13b of the inner pipe 13 and the opening 16b of the side pipe 16 attached to the outer pipe 12 are connected to the pipe 4. The copper outer tube 12 and the spring 17 may be plated with gold or nickel to prevent corrosion.

As shown in FIG. 1, the first tank 21 and the second tank 21
The electrolytic solution 20 is stored in the tank 22 as a conductive fluid. As the electrolytic solution 20, an aqueous sodium chloride solution in which 35 g of sodium chloride was dissolved in 100 g of water was used. When the pump 23 is driven, the electrolytic solution 20 flows from the first tank 21 to the pump 23, the relief valve B1,
It is led to the opening 16b of the side tube 16 of the outer tube 12 of the second electrode 2 through the valve B2. Then, the inside of the flexible pipe 11 is filled, and the valve B4 is inserted through the outer opening 13b of the inner pipe 13.
And returns to the first tank 21.

On the other hand, on the upper side of the second tank 22, an air passage having a regulator R and a valve B5 is attached, and the air pressure is adjusted from Pa0 to Pa1 by the regulator R to control the pressure of the electrolytic solution 20. That is, the internal pressure of the flexible pipe 11 can be adjusted by controlling the air pressure with the regulator R while the valves B2 and B4 are closed and the valves B3 and B5 are opened.

The high frequency power source 3 has a frequency of 41.14.
A high frequency device having a frequency of MHz, a maximum output of 3.6 kW and an output voltage of 6 kV was used. Next, an actual method of using the processing device 10 will be described. As the thermoplastic resin molded product, a pipe 25 made of a soft vinyl chloride resin (hereinafter referred to as "made of PVC") having an outer diameter of 22 mm and a thickness of 2 mm is used, and this PVC pipe 25 has a radius of 35 mm on the center line and a bending angle of 56 °. The process of applying is described as an example.

First, the second electrode 2 was inserted into a PVC pipe 25 (see FIG. 3B) before bending. At this time, the center of the portion to be bent and the center of the second electrode 2 were arranged so as to substantially coincide with each other. And valves B2, B
4 was opened, the valve B3 was closed, and the pump 23 was driven to fill the inside of the flexible pipe 11 with the electrolytic solution 20. Next, the valves B2 and B4 were closed, the valve B3 was opened, and the air pressure was adjusted by the regulator R to set the internal pressure of the flexible pipe 11 to about 1.5 kg / cm ² . At this time, the flexible pipe 11 expanded a little and stuck to the inner wall of the vinyl chloride pipe 25. In this state, put the PVC pipe 25 on the lower mold 1b of the mold 1.
Then, the air cylinder 7 was driven to move the upper die 1a of the die 1 downward to match the lower die 1b.

Thereafter, the flexible pipe 1 is adjusted by adjusting the air pressure.
The internal pressure of 1 is about 2.5 kg / cm ² And This and
Then, the flexible pipe 11 is further expanded to make a PVC pipe 25.
Is pressed against the mold 1 side, and in this state by the high frequency power source 3,
High frequency voltage (frequency 41.14MHz, maximum output 6k
V, anode current 0.5 to 0.75 A) was applied. Inflated
At this time, the internal volume of the flexible pipe 11 is about 14 cc.
It was The heating time or oscillation time is 4 seconds, and the breakdown is 0
~ 0.5A for about 0.5 seconds, 0.5 ~ 0.75A for about 1.
5 seconds, 0.75A was about 2 seconds. Flexible pipe 11
A copper spring 1 integrated with a copper outer tube 12 inside the
Since 7 exists, the contact area with the electrolytic solution 20 increases
As a result, high frequency induction heating can be performed effectively.
Came. After performing this heat treatment, cooling is performed by circulating the electrolyte solution 20.
It was carried out for 25 seconds by natural cooling without ringing. Second
Work to extract the electrode 2 from the PVC pipe 25 after processing
After reducing the pressure of the electrolytic solution 20, the flexible pipe 11
Since the second electrode 2 is deformable due to its existence, it can be easily performed.
I was able to.

As a result of the above processing, the outer diameter of the vinyl chloride pipe 25 was almost the same as that of the mold 1, and there was a certain level of tolerance even in the bent state, which was satisfactory. However, in the case where the electrolytic solution 20 is cooled and produced under the condition that the electrolytic solution 20 is not circulated after the heat treatment, the temperature of the electrolytic solution 20 rises for each processing (see Table 1). Therefore, it is preferable to lower the temperature of the electrolytic solution to a certain level by gradually increasing the cooling time according to the number of times of processing.

[0025]

[Table 1]

On the other hand, after the heat treatment, the air pressure is reduced by the regulator R, the valve B3 is closed, and the valve B2 is closed.
When B4 is opened and the electrolytic solution 20 is cooled while being circulated, that is, when the pipe 4 is used as a circulation path, the temperature of the second electrode 2 is almost at the same level as the initial temperature (16 ° C.), and the production efficiency is high. Has been significantly improved, and variations in bending angle and the like have become even smaller.

Also, during the heat treatment, when the treatment is performed while circulating the electrolyte solution 20 while maintaining a predetermined pressure, the load of the cooling treatment performed after the end of the heating is reduced, so that the production efficiency is improved. Furthermore, if a high temperature electrolyte is used before the heat treatment and a low temperature electrolyte is circulated during and after the heat treatment, the former can further shorten the heat treatment time and the latter can reduce the cooling treatment time. Since it can be reduced, the production efficiency is further improved.

As the second electrode, those shown in FIGS. 4 (b) to 4 (h) can be used in addition to those used in the first embodiment. The second electrode 2 of the first embodiment (see FIG.
The same reference numerals are omitted for the same components as (a)). The second electrode 31 of FIG.
Since it is fixed by using a plastic core material 26 when it is embedded in 5, the centering becomes more reliable as compared with the second electrode 2. In addition, the inner opening 12a of the outer tube 12 has the seal portion 14
Since it substantially coincides with the end surface of No. 3, when the pressure of the electrolytic solution 20 is increased, even if bubbles are generated inside the flexible pipe 11, there is an effect that the bubbles are smoothly discharged from the outer pipe 12 side.
Since the electrolytic solution 20 does not exist in that portion in the state where the bubbles remain generated, there arises a problem that the high frequency dielectric heating of the pipe 25 contacting that portion is not sufficient and the heat treatment is insufficient in that portion.

The second electrode 32 of FIG. 4 (c) does not have the spring 17 embedded in the seal portion 15, and is inferior to the second electrode 2 in terms of centering, but is in contact with the electrolytic solution in a sufficient area. You can. The second electrode 33 of FIG. 4D is one in which the inner opening 13a of the inner tube 13 is embedded in the seal portion 15 and the perforations 27 are provided on the side surface of the inner tube 13. According to this, since the elongation in the longitudinal direction is regulated when the internal pressure rises, the second
Compared with the electrode 2, there is an effect that it is possible to further suppress the variation of the product after the processing operation is completed.

The second electrode 34 shown in FIG. 4 (e) is the wire mesh 2 from the vicinity of the inner opening 12a of the outer tube 12 to the vicinity of the seal portion 15.
8 is provided, which is inferior to the second electrode 2 in terms of centering, but can contact the electrolytic solution in a sufficient area. Figure 4
The second electrode 35 of (f) is one in which the wire netting 28 is embedded in the seal portion 15, and the same effect as in FIG. 4D is obtained.

In the second electrode 36 of FIG. 4 (g), the wire net 28 is embedded in the seal portion 15, and the spring 17 is inserted in the wire net 28.
Since the contact area with the electrolytic solution is increased as compared with the second electrode 2, the high frequency dielectric heating can be more effectively performed. Further, an effect similar to that of FIG. 4D can be obtained.

The second electrode 37 of FIG. 4 (h) has no spring or wire mesh, and uses a short tube 38 instead of the outer tube and a long tube 39 instead of the inner tube. Next, a second embodiment will be described. FIG. 5 is an explanatory view of the main part of the device of the second embodiment.
The processing apparatus 50 of the second embodiment has substantially the same configuration as that of the apparatus 10 of the first embodiment, but instead of using the flexible pipe 11, the electrolytic solution 20 is directly put into the PVC pipe 25 to make the PVC pipe. Easy-to-remove seal parts 41 at both ends of the pipe 25,
The difference is that 42 is provided. Therefore, the device 1 of the first embodiment
The same components as those of 0 are indicated by the same reference numerals and the description thereof will be omitted.

The method of use of this embodiment is almost the same as that of the first embodiment, but the pressure of the electrolytic solution 20 is directly the PVC pipe 25.
The difference is that the vinyl chloride pipe 25 is pressed against the mold 1. Further, after the cooling process is completed, it is only necessary to remove the seal portions 41 and 42 and remove the electrolyte solution 20 inside, and there is no need to remove the second electrode 2 from the PVC pipe 25 as in the first embodiment. different. Due to such a difference in action, when a die having a complicated shape is used, the device / method of the first embodiment makes the work of extracting the second electrode a little complicated, and thus the present embodiment does not require such a complicated work. The example device / method is advantageous.

Next, a third embodiment will be described. FIG. 6 is a schematic explanatory view of the processing apparatus of the third embodiment, and FIG.
Is an explanatory view showing a state before processing, and (b) is an explanatory view showing a state during processing. FIG. 7 is a perspective view of the PVC sheet after processing. The third embodiment is a processing device 60 for a thermoplastic molded product, and the processing device 60 is a mold 6 as a first electrode.
The first electrode 62, the second electrode 62, the high-frequency power source 63, and a pipe (not shown).

The material of the die 61 as the first electrode is aluminum, and as shown in FIG. 6, unevenness is provided on the upper surface. The mold 61 is fixed to the table 65 with screws. The second electrode 62 includes a copper housing 71 and a copper mounting portion 7 provided along the periphery of the housing 71.
2. A wire mesh 73 attached to the attachment portion 72 and a flexible portion 74 made of a silicon rubber film. The housing 71 of the second electrode 62 is fixed to the tip of the plunger 67a of the air cylinder 67 attached to the top plate portion 66a of the outer frame 66 via an insulator 69, and guide members 68a provided on both sides of the plunger 67a. 68
It is moved up and down by driving the air cylinder 67 while being guided by b. Therefore, the second electrode 62 can contact and separate from the mold 61. In addition, the housing 71 of the second electrode 62 has two L's connected to a pipe (not shown).
Character tubes 75 and 76 are provided.

Next, an actual method of using the processing device 60 will be described. A vinyl chloride sheet 85 is used as the thermoplastic resin molded article, and processing for molding the sheet 85 into the shape having the unevenness shown in FIG. 7 will be described as an example. First, the PVC sheet 85 was placed on the mold 61 in a state where the second electrode 62 was separated upward from the mold 61 by the air cylinder 67. Next, the second electrode 62 was moved downward by the air cylinder 67 so as to be aligned with the mold 61. Then, similarly to the first embodiment, the inner portion 62 of the second electrode 62 is
The pressure of the electrolytic solution was increased by filling a with the electrolytic solution. At this time,
The flexible portion 74 expands and the sheet 85 is pressed against the mold 61 side (see FIG. 6B). In this state, a high frequency voltage (frequency 41.14 MHz) was applied by the high frequency power supply 3. Since the inner wire 62a of the second electrode 62 has the copper wire mesh 73 integrated with the copper housing 71, the contact area with the electrolytic solution is increased, and as a result, high frequency induction heating is effectively performed. I was able to. After a predetermined time,
Cooling is performed by circulating the electrolytic solution, the pressure of the electrolytic solution is reduced when the temperature of the electrolytic solution is sufficiently lowered, and the second electrode 62 is separated upward from the mold 61 by the air cylinder 67, and the processing is completed. did. In the second embodiment, the second electrode 6
Since the second flexible portion 74 acts as the upper mold of the mold 61, the cost of the mold 61 is reduced.

As a result of the above processing, the shape of the vinyl chloride sheet 85 was almost the same as that of the mold 61 and had a certain level of tolerance, which was satisfactory. In addition, if the electrolyte is circulated and cooled after the heat treatment, the production efficiency is remarkably improved and the tolerance of the processed product is further reduced.

As a modified example of the third embodiment, as shown in FIG. 8, the upper surface of the housing 71 of the second electrode 62 is inclined so that the space above the interior 62a becomes larger from the tube 76 side to the tube 75 side. By adopting the structure described above, there is an effect that bubbles contained in the electrolytic solution are smoothly discharged from the inside 62a of the second electrode 62. As a result, there is no possibility that a portion where high-frequency dielectric heating is insufficient is generated. still,
In this case, the pressure of the electrolytic solution is applied from the pipe 76 toward the pipe 75.

Needless to say, the present invention is not limited to the above-mentioned embodiments and can be carried out in various modes without departing from the technical scope of the present invention. For example, as the thermoplastic resin molding suitable for the present invention, in addition to moldings made of vinyl chloride, moldings such as nylon, polyvinylidene chloride, hard polyvinyl chloride, acetate film, butyrate, acrylic, polyester may be used. it can.
It is also possible to use a pipe obtained by profiling a kneaded material of polysulfide-based rubber or chloroprene-based rubber before vulcanization, or a film-shaped material.

Further, the frequency of the high frequency power source determines the frequency suitable for the high frequency dielectric heating from the dielectric constant and the dielectric loss factor of the material of the thermoplastic resin molding. Further, in the above embodiment,
Although the flexible portion, that is, the flexible pipe 11 and the flexible portion 74 are formed of silicon rubber, fluororesin rubber, polypropylene, polyethylene, polyurethane, or the like can be used instead of silicon rubber. However, it is preferable that the material used for the flexible portion hardly causes high frequency dielectric heating at the frequency used. Such properties can be predicted by the dielectric constant and dielectric loss factor of the material used. For example, in the case of the vinyl chloride pipe and vinyl chloride sheet used in the above-mentioned examples, silicon rubber and fluororesin rubber are preferable, but when polyurethane rubber is used, high frequency dielectric heating occurs, which is not so preferable.

Table 2 shows the dielectric characteristics of each material.
The dielectric loss factor is obtained by the product of the dielectric constant and the dielectric loss tangent. According to this table, PVC (polyvinyl chloride), nylon 6 and epoxy resin are preferable as the material suitable for high frequency dielectric heating, that is, the material suitable for the thermoplastic resin molding of the present invention, while not suitable for high frequency dielectric heating. As the material, that is, the material forming the flexible member or the flexible portion of the present invention, polystyrene, polyethylene, polypropylene,
It can be seen that PPO and tetrafluoroethylene (fluorine resin) are preferable.

[0042]

[Table 2]

When the flexible portion is made of a conductive resin, pure water or oil, which is a non-conductive fluid, may be used instead of the electrolytic solution. This is because the flexible portion acts as an electrode. As the conductive resin, for example, a resin mixed with carbon or metal powder,
Any commonly known one can be used.

Further, as the conductive fluid, an aqueous solution of sodium chloride, an aqueous solution of sodium hydroxide, an aqueous solution of potassium hydroxide or the like can be used as an electrolytic solution, and a metal that is fluid at room temperature, for example, mercury can also be used. it can. Furthermore, the shapes of the mold and the second electrode are not limited to those in the above embodiment, and may be formed according to the shape of the molded product. For example, in the case of bending a pipe having a U-shaped cross section, a die having an outer shape of the pipe and a second electrode having a flexible film made of a silicone rubber film capable of accommodating the inner shape of the pipe, This makes it possible to configure a processing device for a thermoplastic molded product.

[0045]

As described above in detail, according to the method for processing a thermoplastic resin molded article according to claim 1 or 2, the time required for processing can be shortened and the work can be facilitated to improve the production efficiency. You can Further, by using the electrode structure according to claim 3 and the apparatus for processing a thermoplastic resin molded product according to claim 4 or 5, the above processing can be appropriately performed.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of a first embodiment.

FIG. 2 is a view from A of FIG.

3A and 3B are perspective views of a mold and a processed product, FIG. 3A is a perspective view of the mold, FIG. 3B is a perspective view of a pipe before processing, and FIG.
[Fig. 4] is a perspective view of a pipe after processing.

FIG. 4 is an explanatory diagram of a second electrode, (a) is an explanatory diagram of a second electrode of the first embodiment, and (b) to (h) are explanatory diagrams of other second electrodes.

FIG. 5 is an explanatory view of the main parts of the device of the second embodiment.

FIG. 6 is a schematic explanatory view of a processing apparatus of a third embodiment,
FIG. 6A is an explanatory diagram showing a state before processing, and FIG. 6B is an explanatory diagram showing a state during processing.

FIG. 7 is a perspective view of a soft vinyl chloride resin sheet after processing according to a third embodiment.

FIG. 8 is an explanatory diagram of a second electrode as a modified example of the third embodiment.

[Explanation of symbols]

1, 61 ... Mold, 2, 31-37, 6
2 ... second electrode, 3, 63 ... high frequency power supply,
10 ... Pipe bending apparatus, 11 ... Flexible pipe, 12 ... Outer tube, 13 ... Inner tube,
16 ... Side tube, 17 ... Spring,
20 ... Electrolyte, 25 ... Soft vinyl chloride resin pipe, 50, 60 ... Processing device,
74 ... Flexible part, 85 ... Soft vinyl chloride resin sheet,

Claims (5)

[Claims] 1. The conductive material in a state where one side of a thermoplastic resin molded product is brought into contact with a mold and the molded product is pressed against the mold by the pressure of a conductive fluid from the other side of the molded product. A method for processing a thermoplastic resin molded article, characterized in that a high-frequency voltage is applied between a fluid and the mold to process the molded article by high-frequency dielectric heating. 2. A thermoplastic resin molded product is brought into contact with one side of a molded product, and the other side of the molded product is brought into contact with a fluid through a flexible member, and the molded product is molded into a metal by the pressure of the fluid. In the state of being pressed against the mold, a high frequency voltage is applied between the flexible member or the fluid having conductivity and the mold,
A method for processing a thermoplastic resin molded article, which comprises subjecting the molded article to mold processing by high-frequency dielectric heating. 3. An electrode structure comprising a fluid inside, a flexible portion expandable / contractible by the pressure of the fluid, wherein at least one of the fluid and the flexible portion has conductivity. . 4. A mold as a first electrode capable of contacting one side of a thermoplastic resin molded article, and the electrode structure according to claim 3, wherein the flexible portion is located at a position facing the mold. An apparatus for processing a thermoplastic resin molded article, comprising: a second electrode arranged and a high-frequency power source that applies a high-frequency voltage between the mold and the second electrode. 5. The apparatus for processing a thermoplastic resin molded article according to claim 4, wherein the second electrode is provided with a circulation path through which the fluid circulates inside and outside the second electrode. .