JP2009083395A - Production process of thermoplastic resin molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermoplastic resin molding which seldom gives gloss unevenness. <P>SOLUTION: The present production process comprises: the heating step of heating vicinity of a mold cavity forming cavity surface by a heating means 61, the supply step of supplying a molten thermoplastic resin into the cavity, the primary cooling step of cooling the supplied thermoplastic resin, the secondary cooling step of cooling thermoplastic resin with a cooling rate quicker than that of the primary cooling step, and the takeoff step of taking the produced molding off the cavity inside. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing a thermoplastic resin molded body.

  Thermoplastic resin moldings are lightweight and have good shapeability, and thus are used in a wide range of fields such as automobile interior parts, exterior parts, home appliances, and housing related products. A resin molded body obtained from such a thermoplastic resin can be manufactured by a molding method such as injection molding or compression molding, but has a plurality of resin supply gates when manufacturing a complicated shape having an opening. When a mold is used, an appearance defect such as a weld may occur in the obtained molded body.

In order to suppress such appearance defects, a technique for performing molding by controlling the mold temperature has been studied. For example, Patent Document 1 discloses that a high-frequency induction heating means is inserted into a mold while the mold is in the middle of mold clamping, so that the mold is rapidly heated and provided in the mold during the heating operation. Molded by circulating a cooling medium at a constant temperature in the cooling medium path, taking out high-frequency heating means based on the temperature detection of the sensor that measures the mold temperature, restarting mold clamping, and injecting resin A molding method for a molded product is disclosed, in which a molding cycle of the product is performed and the temperature of the cooling medium is kept constant during the molding cycle.
Japanese Patent Laid-Open No. 02-162007

However, in this method, since the temperature of the cooling medium is kept constant, temperature unevenness is likely to occur on the cavity surface between the heated part and the cooled part, and gloss unevenness occurs on the resulting resin molded body. There was a case.
In view of the above problems, an object of the present invention is to provide a thermoplastic resin molded body that hardly causes uneven gloss.

  The present inventors have found that it is possible to suppress the occurrence of uneven gloss by changing the cooling rate in the process of cooling the resin injected into the mold, and the present invention has been completed. It was. Specifically, the following are provided.

  That is, the present invention includes a heating step in which the vicinity of a cavity surface forming a cavity of a mold is heated by a heating means, a supply step of supplying a molten thermoplastic resin into the cavity, and the supplied thermoplastic resin A secondary cooling step for cooling the thermoplastic resin at a cooling rate faster than the cooling rate in the primary cooling step, and an extraction step for taking out the produced molded body from the cavity. The manufacturing method of the thermoplastic resin molding which has is provided.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the thermoplastic resin molded object which is hard to produce uneven glossiness.

  The method for producing a thermoplastic resin molded body (hereinafter also simply referred to as a molded body) according to the present invention includes a heating step, a supplying step, a primary cooling step, a secondary cooling step, and a removal step. Details will be described below.

[Heating process]
The heating step refers to a step of heating the vicinity of the cavity surface that forms the cavity of the mold by a heating means.
As a method of heating the mold, there are a method of heating using a mold in which a heater is incorporated, a method of heating by providing a heater inside the mold (surface on the side where the mold cavity is formed), etc. Can be mentioned. Among these, it is preferable to use a method of heating by providing a heater inside the mold because the cavity surface transferred to the appearance of the molded product can be directly heated.
Examples of the heating means include an electric heater and high frequency induction heating. Of these, high-frequency induction heating is preferably used, and more preferably high-frequency induction heating is performed using a heating coil capable of easily heating a desired position.

Although the temperature which heats a cavity surface changes with kinds of thermoplastic resin to be used, it is preferable that it is 30 to 60 degreeC higher than the thermal deformation temperature of a thermoplastic resin, and is 30 degreeC-higher than the thermal deformation temperature of a thermoplastic resin. More preferably, the temperature is higher by 50 ° C. The “heating temperature” in the present invention is based on the temperature of the cavity surface, and the measurement is particularly limited as long as it is a measurement method using a general thermometer such as a thermocouple, a side temperature resistor, a radiation thermometer, etc. Not.
Moreover, although heating time changes with kinds of thermoplastic resin to be used, it is preferable that it is 1 second-60 seconds, and it is more preferable that it is 1 second-40 seconds. For example, when polypropylene is used as the thermoplastic resin, it is preferably 1 second to 40 seconds.

  The shape of the mold used in the method for producing a molded body according to the present invention is not particularly limited as long as it is a mold used for normal injection molding, but a metal plate is formed on the cavity surface forming the cavity. It is preferable to use a mold provided with This metal plate is not particularly limited as long as it is a metal such as aluminum alloy, zinc alloy, nickel, nickel alloy, copper, copper alloy, etc. in addition to steel, SUS, etc., but is manufactured by electroforming. It is preferable to use a metal plate. This is because the electroforming method can faithfully reproduce the shape of the design surface of the product and can produce a thermoplastic resin molded body having various patterns.

  FIG. 1 is a view showing an example of a mold preferably used in the method for producing a molded body according to the present invention. In the drawings, the same members are denoted by the same reference numerals, and the description thereof is omitted. The mold 10 is composed of a male and female pair of a female mold (first mold) 20 and a male mold (second mold) 30. The female mold 20 and the male mold 30 are closed, and the cavity 40 is disposed inside the mold 10. Is formed.

The female mold 20 includes a metal plate 210 on the cavity surface 21 that forms the cavity 40. A plurality of metal tubes 220 are arranged on the back surface of the metal plate 210, that is, the surface opposite to the cavity surface 21 so as to contact the metal plate 210. These metal tubes 220 are connected to a heat exchange medium supply device (not shown) through wiring. A flow path through which a heat exchange medium made of a heat medium or a cooling medium supplied from a heat exchange medium supply device flows is formed inside the metal tube 220.
The metal tube 220 is formed from a metal material having high thermal conductivity such as copper. The female mold 20 according to the present embodiment uses the metal tube 220 for the formation of the flow path, so that there is a degree of freedom in handling and the flow path can be easily formed at a desired position.

  The female mold 20 is provided with a heat insulating member 22 so as to cover the back surface of the metal plate 210 and the metal tube 220. The heat insulating member 22 is made of, for example, a thermosetting resin material such as an epoxy resin having a low thermal conductivity, ceramics such as cement, and the like. When the cavity surface 21 of the female mold 20 is heated, the heat from the heating means is Heat transfer to the entire female die 20 can be suppressed, and the metal plate 210 (cavity surface 21) and the vicinity thereof can be efficiently heated. Further, at the time of cooling, the heat from the metal plate 210 can be efficiently transferred toward the metal tube 220, and the metal plate 210 (cavity surface 21) can be efficiently cooled.

The female mold 20 is provided with a frame member 23 so as to cover the heat insulating member 22 from the outside. The frame member 23 holds the metal plate 210, the metal tube 220, and the heat insulating member 22, and the material is not particularly limited as long as the metal plate 210, the metal tube 220, and the heat insulating member 22 can be held.
In addition to forming the flow path using the metal tube 220 disposed on the back side of the metal plate 210, the temperature integrally formed inside the female die of the metal member that does not include the metal plate or the heat insulating member. You may form a flow path using an adjustment channel.

Similar to the female mold 20, the male mold 30 also has a cavity surface 31. The cavity surface 31 is provided with a resin supply gate 320 for supplying the molten thermoplastic resin into the cavity 40.
One resin supply gate 320 may be provided, or two or more resin supply gates 320 may be provided. The resin supply gate 320 communicates with a resin supply passage 32 formed in the male mold 30. The resin supply passage 32 is connected to an injection nozzle of an injection device 50 that can melt and inject a predetermined amount of the thermoplastic resin, thereby supplying the molten thermoplastic resin into the cavity 40. it can. Further, the male mold 30 is formed with a plurality of temperature adjustment passages 310 for heating or cooling the cavity surface 31, and a heat exchange medium supply device is connected to the temperature adjustment passages 310.
As with the female mold 20, the male mold 30 may be provided with a metal plate on the cavity surface 31, a metal pipe disposed on the back side of the cavity surface of the metal plate, and a heat insulating member.

  In the pair of molds 10 including the female mold 20 and the male mold 30 described above, the male mold 30 is fixed to a fixed plate of a press device (not shown), the female die 2 is fixed to a movable plate, and is movable by a driving device. The mold can be clamped by moving the board in the direction of the fixed board. The female mold 20 may be fixed to the stationary platen, and the male mold 30 may be fixed to the movable platen, or both the female mold 20 and the male die 30 can be moved by changing the fixed platen to the movable platen. It may be.

Next, the procedure for heating using the mold 10 will be described.
FIG. 2 is a view showing a state in which the mold 10 is heated. First, as shown in FIG. 2A, the cavity 40 is opened by moving the female mold 20 upward as viewed in the figure, and the heating means 60 is inserted from the outside. The heating means 60 in this embodiment includes a heating coil 61 and a transfer device 62 that can perform high-frequency electromagnetic induction heating. Then, as shown in FIG. 2B, the heating coil 61 is moved so as to approach the cavity surface 21 of the female mold 20, and the cavity surface 21 of the female mold 20 and the vicinity thereof are heated by high frequency electromagnetic induction. To do.
Thus, by disposing the heating means 60 outside, it is possible to easily heat the cavity surface 21 and a desired position in the vicinity thereof. Further, by using the heating coil 61, the cavity surface 21 and the vicinity thereof can be efficiently heated.

  The temperature of the cavity surface 21 to be heated and the temperature in the vicinity thereof are 30 ° C. to 60 ° C. higher than the thermal deformation temperature of the supplied thermoplastic resin at the time of supplying the molten thermoplastic resin into the cavity 40. preferable. By setting the temperature of the cavity surface 21 and the vicinity thereof to a temperature that is 30 ° C. to 60 ° C. higher than the thermal deformation temperature of the thermoplastic resin, it is possible to effectively suppress the occurrence of uneven gloss in the resulting molded body. . This heat distortion temperature can be measured according to the method B of JIS K7191-2.

  The heating coil 61 preferably has a copper tube forming the heating coil 61 having a shape corresponding to the shape of the cavity surface 21 in order to uniformly heat the cavity surface 21. It is also possible to change the heating coil 61 to a heating means such as an electric heater.

[Supply process]
The supplying step refers to a step of supplying a molten thermoplastic resin into the cavity 40 heated by the heating step.
As a method for supplying the thermoplastic resin, a commonly used supply method may be used. For example, as shown in FIG. 3A, the heated female mold 20 and male mold 30 are closed to form a cavity 40, and the male mold 30 is placed in the cavity 40 formed by the pair of male and female molds 10. There is a method of supplying the molten thermoplastic resin 51 from the resin supply gate 320 through the resin supply passage 32 formed in the above.
The molten thermoplastic resin 51 supplied from each resin supply gate 320 flows in the cavity 40 and merges in the vicinity of the middle point of each resin supply gate 320. In this vicinity, defects such as welds tend to occur. However, since the cavity surface 21 in the vicinity of the joining portion has been heated by the heating coil in advance, the speed of solidification when cooling is reduced, and the occurrence of appearance defects such as welds can be suppressed.

The cavity 40 at the time when the supply of the molten thermoplastic resin 51 is started has a clearance larger than the target molded body thickness. After the supply starts, the female mold 20 is lowered so that the clearance becomes small, and the mold is clamped. (Refer to FIG. 3B).
By performing the mold clamping, the injection pressure and the mold clamping pressure can be reduced, and a compact body with excellent downsizing and quality can be obtained. The timing for performing the mold clamping may be either during the supply of the molten thermoplastic resin 51 or after the completion of the supply, but when performing the mold clamping after the completion of the supply, the mold clamping is started immediately after the completion of the supply. It is preferable. In the figure, an example of clamping in the upward direction (vertical direction) is shown in the figure, but the clamping direction may be the vertical direction or the horizontal direction. Further, depending on the use, shape, size, and the like of the thermoplastic resin molded body, the melted thermoplastic resin may be supplied with the clearance of the cavity 40 adjusted to substantially the same dimension as the thickness of the thermoplastic resin molded body. Good.
Further, when the supply of the molten thermoplastic resin 51 is started, the female mold 20 may be raised so that the clearance is smaller than the thickness of the target molded body and the clearance becomes larger according to the supply amount.

[Primary cooling process]
The primary cooling step refers to a step of cooling the supplied thermoplastic resin. By providing this primary cooling step, only the surface of the thermoplastic resin can be cooled and solidified.
As a specific cooling method, for example, a cooling medium such as water is provided in the metal tube 220 provided in the female mold 20 and the temperature control passage 310 formed in the male mold 30 shown in FIG. In which the cavity surfaces 21 and 31 are cooled respectively.

The upper limit temperature of the surface temperature of the cavity surface at the start of cooling in the primary cooling step varies depending on the type of thermoplastic resin used. Specifically, on the basis of the heat deformation temperature of the thermoplastic resin used, the temperature is 50 ° C. higher than the heat deformation temperature, and the lower limit temperature of the cavity surface temperature is 35 ° C. higher than the heat deformation temperature. It is. By setting it as such a temperature range, it becomes possible to solidify the surface of a thermoplastic resin. The upper limit temperature is preferably 50 ° C. higher than the heat distortion temperature, and more preferably 40 ° C. higher. The lower limit temperature of the cavity surface temperature is preferably 35 ° C. higher than the thermal deformation temperature, and more preferably 30 ° C. higher.
The cooling time is preferably 1 second to 10 seconds, and more preferably 1 second to 8 seconds.
For example, when polypropylene is used as the thermoplastic resin, the upper limit temperature of the surface temperature of the cavity surface at the start of cooling in the primary cooling step is 135 ° C., and the lower limit temperature is 120 ° C. The cooling time is preferably 1 to 10 seconds.

  As for the surface temperature of the cavity surface, a general thermometer such as a thermocouple, side temperature resistor, radiation thermometer, etc. is installed on the cavity surface, and primary cooling or secondary cooling is performed without injecting thermoplastic resin. The surface temperature of the cavity surface is obtained by measuring the temperature of the cavity surface in between.

[Secondary cooling process]
The secondary cooling step refers to a step of cooling the thermoplastic resin at a cooling rate faster than the cooling rate in the primary cooling step after the primary cooling. By providing this secondary cooling step, it becomes possible to suppress the occurrence of uneven glossiness of the molded body. Moreover, since the cooling rate of secondary cooling is faster than the cooling rate of primary cooling, it becomes possible to manufacture a molded object efficiently, without extending the cycle time of a manufacturing process.

As the cooling method, similarly to the primary cooling, there is a method in which a cooling medium is circulated in the temperature adjusting passage and cooled. In this secondary cooling step, cooling is performed at a cooling rate faster than the cooling rate of the primary cooling step. The ratio of the cooling rate in the primary cooling step and the cooling rate in the secondary cooling step (cooling rate in the secondary cooling step / cooling rate in the primary cooling step) is 1.1 times or more, more than 1.2 times Preferably, 1.3 times or more is most preferable.
If the cooling rate of the primary cooling step is faster than the cooling rate of the secondary cooling step, temperature unevenness is likely to occur between the heated portion and the cooled portion of the cavity surface, and gloss unevenness is likely to occur in the resulting molded article. Therefore, by setting the ratio of cooling rates to 1.1 times or more, it becomes possible to suppress the occurrence of uneven gloss of the molded body. Moreover, it becomes possible to manufacture efficiently, without extending cycle time by setting it as such a cooling rate.
For example, when polypropylene is used as the thermoplastic resin, the cooling rate ratio is preferably 1.1 times to 1.3 times, and more preferably 1.2 times to 1.3 times.

The cooling rate of the secondary cooling step can be adjusted by adjusting the flow rate of the cooling medium or increasing the flow rate of the circulating refrigerant.
As means for changing the temperature of the refrigerant, for example, a plurality of heat exchange medium supply devices are connected to a metal tube provided in a female mold, and the temperature of each cooling medium is differentiated. In the primary cooling step, a cooling medium having a high temperature (for example, 30 ° C. to 60 ° C.) is circulated, and in the secondary cooling step, a cooling medium having a low temperature (for example, 5 ° C. to 30 ° C.) is circulated. It becomes possible to attach. Note that a method may be used in which the cooling rate is made different by circulating the cooling medium in the secondary cooling process without circulating the cooling medium in the primary cooling process. The heat exchange medium supply device is preferably a system that is switched manually or automatically and operated in conjunction with an injection molding machine.
The cooling rate is the rate at which the temperature of the cavity surface decreases from the start of cooling to the end of cooling, and the measurement method is to use a general thermometer such as a thermocouple, side temperature resistor, radiation thermometer, etc. on the cavity surface. Install and measure the temperature that falls during the primary or secondary cooling without injecting the thermoplastic resin, and obtain the temperature drop per unit time to obtain the cooling rate. For example, the cooling rate when the cavity surface temperature, which is 135 ° C. at the start of cooling, is lowered to 110 ° C. in 5 seconds is −300 ° C./min.

Moreover, the upper limit temperature of the surface temperature of the cavity surface at the start of cooling in the secondary cooling step differs depending on the type of thermoplastic resin used, as in the primary cooling. Specifically, on the basis of the heat deformation temperature of the thermoplastic resin, the temperature is 35 ° C. higher than the heat deformation temperature, and the lower limit temperature of the cavity surface temperature is the heat deformation temperature. By setting it as such a temperature range, it becomes possible to suppress generation | occurrence | production of gloss unevenness.
The cooling time is preferably 1 second to 60 seconds, and more preferably 1 second to 40 seconds. By setting the cooling time within such a range, it is possible to further suppress the occurrence of uneven gloss.

In the present invention, a tertiary or quaternary cooling step for cooling at a cooling rate that is the same as or faster than the cooling rate of the secondary cooling step may be provided after the secondary cooling step. The cooling rate in that case is preferably faster than the cooling rate in the previous cooling step. Moreover, when providing the cooling process after a secondary cooling process, it is preferable that the cooling time of secondary cooling is 1 second-40 seconds, and it is more preferable that they are 1 second-30 seconds. This makes it possible to manufacture more efficiently without extending the time required for the take-out process.
For example, when polypropylene is used as the thermoplastic resin, the upper limit temperature of the surface temperature of the cavity surface at the start of cooling in the secondary cooling step is 120 ° C., and the lower limit temperature is 85 ° C. The cooling time is preferably 1 to 30 seconds.

[Removal process]
An extraction process means the process of taking out the manufactured molded object from the inside of a cavity. Specifically, it is a step of moving the movable platen of the apparatus to open the cavity and taking out the molded product inside.
A molded body can be obtained through the above steps.

  Here, examples of the thermoplastic resin that can be used in the production method according to the present invention include thermoplastic resins that are usually used in compression molding, injection molding, extrusion molding, and the like. Examples of such resins include general polypropylene, polyethylene, acrylonitrile-styrene-butadiene block copolymers, polyamides such as polystyrene and nylon, polyvinyl chloride, polycarbonate, acrylic resins, styrene-butadiene block copolymers, and the like. And thermoplastic elastomers, thermoplastic elastomers such as ethylene / propylene rubber (EPM, EPDM), mixtures thereof, and polymer alloys using these.

Moreover, these thermoplastic resins may contain fillers, such as glass fiber normally used as needed, various inorganic, organic fillers, etc. Moreover, you may contain various additives, such as various pigments normally used, a lubricant, an antistatic agent, and a stabilizer.
The thermoplastic resin may be non-foaming or foaming and may contain a foaming agent. As the foaming agent, a chemical foaming agent may be added, or liquid or gaseous carbon dioxide or nitrogen may be directly pressed into the molten resin.

As the chemical foaming agent, a known chemical foaming agent used in producing a thermoplastic resin foam can be used. Specifically, inorganic foaming agents such as sodium bicarbonate, ammonium bicarbonate and ammonium carbonate, nitroso compounds such as N, N′-dinitrosopentamethylenetetramine, azodicarbonamide and azo such as azobisisobutyronitrile. Compounds, sulfonyl hydrazides such as benzenesulfonyl hydrazide, toluenesulfonyl hydrazide, diphenylsulfone-3,3′-disulfonyl hydrazide, and blowing agents such as p-toluenesulfonyl semicarbazide can be used. Furthermore, it is preferable to add salicylic acid, urea or a foaming aid containing these as required.
The type of the foaming agent is appropriately selected in consideration of the melting temperature of the thermoplastic resin to be used, the target expansion ratio, and the like. The amount added is adjusted in consideration of the strength, density and the like of the target molded product, but is generally about 0.1 to 5 parts by mass with respect to 100 parts by mass of the resin.

  EXAMPLES Hereinafter, although this invention is demonstrated in more detail based on an Example, this invention is not limited to these Examples.

[Example 1]
Using a Sumitomo Noblen AZ864E4 (manufactured by Sumitomo Chemical Co., Ltd., MFR = 30 g / 10 min) as a thermoplastic resin, a molded product having dimensions of 600 × 800 mm and a thickness of 2.5 mm is electroformed on the cavity surface as shown in FIG. It shape | molded using the metal mold | die (two-point gate) provided with the metal plate manufactured by the method. A range with a width of 400 mm including the vicinity of the center of the cavity surface of the female mold (near the merged portion of the molten thermoplastic resin) was heated by a heating coil using a high-frequency induction heating apparatus having a high-frequency oscillation frequency of 20 kHz and an output of 50 kW. The mold was closed to a predetermined cavity clearance, and a molten thermoplastic resin was supplied into the mold cavity for cooling.
Here, from the state in which cooling water of 5 ° C. was flowed at a cooling rate of −84 ° C./min for 5 seconds to the state of the cavity surface temperature of 122 ° C. by primary cooling, and then decreased to the cavity surface temperature of 115 ° C. as secondary cooling. Cooling water was allowed to flow at a cooling rate of −100 ° C./min, and was allowed to flow for about 18 seconds to 85 ° C., which is the thermal deformation temperature of the thermoplastic resin. After cooling, the mold was opened and the thermoplastic resin molded article was taken out. The resulting thermoplastic resin molded article had no gloss unevenness and good appearance.

[Comparative Example 1]
In the cooling process, cooling water of 5 ° C. was flowed at a cooling rate of −104 ° C./min at a cavity surface temperature of 122 ° C. from the start of cooling, and cooled to 85 ° C., which is the thermal deformation temperature of the thermoplastic resin, for about 23 seconds. Except for the above, a thermoplastic resin molded body was molded in the same manner as in Example 1. The resulting thermoplastic resin molded article had an appearance with noticeable uneven gloss.

It is the figure which showed the cross section of the metal mold | die used with the manufacturing method of the thermoplastic resin molding which concerns on this invention. It is the figure which showed the procedure of the heating process. It is the figure which showed the mode from the supply start of thermoplastic resin to supply completion in a supply process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mold 20 Female mold 21, 31 Cavity surface 22 Thermal insulation member 23 Frame member 210 Metal plate 220 Metal pipe 30 Male mold 32 Resin supply passage 310 Temperature control passage 320 Resin supply gate 40 Cavity 50 Injection device 51 Molten thermoplastic resin 60 Heating means 61 Heating coil 62 Conveying device

Claims (8)

  A heating step of heating the vicinity of the cavity surface forming the cavity of the mold by a heating means, a supply step of supplying a molten thermoplastic resin into the cavity, and a primary cooling step of cooling the supplied thermoplastic resin And a secondary cooling step of cooling the thermoplastic resin at a cooling rate faster than the cooling rate in the primary cooling step, and a removal step of taking out the produced molded body from the cavity. Manufacturing method.   The upper limit temperature of the cavity surface at the start of cooling in the primary cooling step is a temperature that is 50 ° C. higher than the thermal deformation temperature based on the thermal deformation temperature of the thermoplastic resin, and the lower limit temperature of the cavity surface temperature. The temperature is 35 ° C. higher than the thermal deformation temperature, The method for producing a thermoplastic resin molded article according to claim 1.   The upper limit temperature of the cavity surface at the start of cooling in the secondary cooling step is a temperature that is 35 ° C. higher than the thermal deformation temperature on the basis of the thermal deformation temperature of the thermoplastic resin, and the lower limit of the cavity surface temperature. The method according to claim 1 or 2, wherein the temperature is the heat distortion temperature.   The method for producing a thermoplastic resin molded body according to any one of claims 1 to 3, wherein a ratio of a cooling rate in the primary cooling step and a cooling rate in the secondary cooling step is 1.1 times or more. .   The method for producing a thermoplastic resin molded body according to any one of claims 1 to 4, wherein the mold is provided with a metal plate on a cavity surface forming a cavity.   The said metal plate is a metal plate manufactured by the electroforming method, The manufacturing method of the thermoplastic resin molding of Claim 5 characterized by the above-mentioned.   The method for producing a thermoplastic resin molded body according to any one of claims 1 to 6, wherein the heating means is disposed outside the mold.   The method for producing a thermoplastic resin molded body according to any one of claims 1 to 7, wherein a heating coil for high-frequency induction heating is used as the heating means.

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