KR830001491B1 - Intermittent heating apparatus for plasticizing fluid in injection molding or transfer molding - Google Patents

Abstract

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Description

Intermittent heating apparatus for plasticizing fluids in injection molding or transfer molding

BRIEF DESCRIPTION OF THE DRAWINGS The side view which makes a cross section the part which shows the principal part of the whole injection molding apparatus to which an example of the intermittent heating apparatus of this invention was applied.

Figure 2 is an elevational view, in section, of a portion of another example of the heating apparatus of the present invention.

3 is a cross-sectional view showing the main parts of still another example of the heating apparatus of the present invention.

4 is a schematic diagram of an example of an intermittent heating apparatus and an injection instruction of the present invention.

The present invention relates to an intermittent heating device for plasticizing fluids in injection molding or conveying molding, etc., which uses rubber and synthetic resins with chemical changes due to vulcanization or intermolecular crosslinking as raw materials, and The present invention relates to an apparatus for obtaining a molded article which is vulcanized or cured by cross-molding.

The ultimate purpose of injection molding by rubbers or synthetic resins is "injection, vulcanization (barrel)", ie, "preliminary vulcanization (curing) immediately after completion of injection". By the way, almost all of the molding apparatuses currently being used are working toward the above goal, but they are still far from the above-mentioned "injection or vulcanization", and a considerable time is required for vulcanization (curing) after injection of the raw materials into the molding operation. It is in the stage of requiring more than 120 seconds.

Therefore, the main object of the present invention is to solve the above-mentioned shortcomings of the conventional processing apparatus, that is, to shorten the time required for the vulcanization to a short time of, for example, 10 to 15 seconds.

Although this invention mainly relates to the apparatus for shortening the time required for the said vulcanization (hardening), the following detailed description is given as an example of rubber | gum.

By the way, before discussing the problem of the conventional method, the property regarding the heat | fever of rubber | gum is mentioned a little as an example. The vulcanization of rubber raw materials after kneading with other necessary vulcanizing agents proceeds by thermal history, which takes temperature and time as a factor variable, but the vulcanization rate is sensitive to temperature, for example, temperature rise of 10 ° C. Reduces the vulcanization time by roughly 1/2.

In this characteristic, it can be seen that in order to shorten the vulcanization time in the molding shop to about 15 seconds, for example, the temperature of the plasticizing fluid, for example, 80 ° C, may be raised to, for example, 180 ° C, and pressed into the molding shop. have.

However, rubbers exhibit a rapid vulcanization reaction at higher temperatures, and once vulcanized, rubber loses its plasticity and fluidity irreversibly and becomes incapable of flowing. In order to prevent the occurrence of iso-chiochi in the flow path, the conventional apparatus cannot make the raw material sufficiently high temperature before the raw material is put into the mold. For example, in the flow path, the raw material is kept in the range of 75 to 125 ° C. After entering the mold, it was required to take a long time (usually more than 120 seconds) because it was heated and heated and vulcanized.

A first object of the present invention is to eliminate the drawback that a long time is required for vulcanization of a conventional apparatus. In other words, in this invention, the raw material is heated to a high temperature (for example, 170 to 180 ° C.) at the same temperature as the mold just before the raw material is pressed into the mold, and then pressed into the mold, thereby eliminating the need to wait for the raw material to be heated after being injected into the mold. The shortening of the vulcanization time is the first feature of the present invention.

Also in the conventional apparatus, there was no attempt to raise the raw material as much as possible just before being injected into the mold. However, according to the conventional method of heating (including cooling) of raw materials in an injection molding machine, a transfer molding machine, etc., the raw materials are compressed and kneaded in a mechanical device, heat softening, pressure storage, injection flow, etc. The method of heating through the structure of each part is common until it press-fits into a frame through each process of. That is, the structure (mainly a heater or the like is heated from the outer surface of the thick steel wall, or a heat path of the heat medium is provided in the wall of the structure, and the heat is heated through the heat medium of the temperature. Or cooling) or heat generated by the friction of the raw material itself is also applied, and the raw material temperature immediately before the mold is maintained at a predetermined temperature, for example, in a range of 75 to 120 ° C.

As described above, in the conventional heating apparatus, since the heat transfer is performed using a thick structure as a medium as described above, the heating responsiveness between the heating element and the object to be heated (raw material) is very insensitive, and the raw material is greatly changed immediately before the mold. It was almost impossible to raise the temperature.

Therefore, in the present invention, a heating element having a small heat capacity is used, and the heating element and the raw material are brought into direct contact with each other to force convection of the raw material to the heating element, and the amount of the raw material to be temporarily heated is reduced. The second feature is that the temperature can be greatly increased just before.

Injection molding is performed intermittently by a certain amount. However, in the conventional apparatus, as described above, since the heat capacity of the heating apparatus is large and the amount of the raw material heated at a time is large, heat is generated between the heated material and the heating part of the apparatus. There was a drawback that it took a relatively long time before equilibrium was established. That is, since the method of heating differently from the fuel heated initially and the raw material heated later with respect to one injection molding, there existed a defect that the degree of vulcanization differs and it produces a defect of a characteristic.

In the present invention, the thermal equilibrium is established between the raw material to be heated and the heating part of the apparatus by shortening the heat capacity of the heating apparatus and the amount of the raw material to be temporarily heated, and the heating of the raw material to be heated. The third feature is that it is possible to keep it uniform within the temporary output.

In other words, in the present invention, the raw material present in the heating unit at a time is about 10% or less of the single injection amount, and the raw material is the amount of heat removed by the raw material passing the heating portion of the heating unit and flowing through the heating unit. ) Is roughly the same, and because the time to thermally reach a steady state is short, most of the raw materials are introduced into the mold in a uniformly heated state.

In addition, rubber is a heat insulator and is closer to a heat insulator, and the following values are not constant depending on the content of the components of the blended rubber material, but the thermal conductivity is 1/500 of iron, 1/5 of water, and air. It is said to be six times. In addition, the specific heat of rubber is more than four times that of iron. The second drawback of this conventional device is that it takes time for the heat conduction from the injection into the mold as described above to heat the raw material around and gradually vulcanize it inside, and vulcanize the inside and outside of the molded article. It is easy to produce defects. This angular defect is a serious defect that is likely to occur in forming a thick molded article or a thick uneven molded article.

In the present invention, since the temperature is heated up to the fill temperature just before the raw material is put into the mold, the vulcanization defect does not occur as in the conventional apparatus despite the shape of the mold.

In view of the above-mentioned causes of the drawbacks of the conventional apparatus, the present invention heats up the raw material to be injected into the molding shop at about 10% or less at a time, during the flow of the raw material immediately before the molding shop of the mold, The temperature is raised to a degree, and continuously press-fits into the molding shop under the high temperature state, and the single injection amount is heated once so that the influence of the heating is not affected on the raw material to be injected after the next time. That is, in an injection molding machine or a transfer molding machine, an apparatus for intermittently discharging a raw material plasticizing fluid (including liquid raw materials) by a single injection amount (variable), and a cross section perpendicular to the flow direction of the raw material of the raw material passage connecting the mold; The heating passage is a narrow gap (slit) or a small diameter hole (a narrowed passage consisting of plural or single stages, respectively), and an electric resistance heating element is disposed so as to generate jumbo heat in the heating passage. The raw material fluid is brought into direct contact with the surface of the heating element, or is passed through and in contact with it through a film-shaped thin gun and press-fitted into the frame.In this case, the raw material fluid in the heating passage is The volume of the flow path of? Is equal to or less than the daily injection amount (volume), and preferably, about 10% or less of the daily injection amount, and the resistance heat generation outside the structure of the heating passage. Connect a power variable power supply that can be applied intermittently to the power supply, and intermittently apply the power to the resistance heating element in response to the intermittent flow of the raw material fluid, that is, conduct the current in the rough flow of the raw material fluid, and also roughly As the joule heat generated in the resistance heating element, the electric power was cut off during stop, and about 10% or less of the daily injection amount of the raw material was temporarily heated to the desired temperature in the flow and the heated raw material was continuously By press-fitting in, it is made to heat one injection quantity once.

Next, the temporary embodiment of this invention is demonstrated in detail based on drawing.

FIG. 1 is an elevation view showing a cross section of a part of the entire injection molding apparatus to which an example of the intermittent heating apparatus of the present invention is applied. In the figure, reference numeral 1 denotes a plasticizing cylinder, which has a cylindrical shape, and houses therein a rotating screw shaft 2 for raw material blend run feed. Denoted at 3 is raw rubber, which is supplied into the cylinder 1 through the hopper 3 '. The heating fluid passage 4 is provided in the wall of the plasticization cylinder 1, and the raw material plasticization temperature of the cylinder 1 is controlled to constant temperature through the heating fluid of a suitable temperature to this. When the base of the screw shaft is connected to the piston of the fluid pressure automatic, the entire screw shaft 2 can be reciprocated. The plasticized fuel rubber 3 is stored in the first half of the screw shaft 2. The raw material rubber 3 plasticized by the piston of the fluid pressure operation responding to the injection instruction is extruded forward by the single injection amount through the nozzle 5 in the storage chamber. 6 denotes a movable mold, 7 denotes a fixed mold, and 6 'and 7' denote a heat-resistant electric insulating plate. The molds 6 and 7 form a molding process 8 therein by mold tightening. In the heating medium passage 9a and the like provided in the molds 6 and 7, the molds 6 and 7 are maintained at the vulcanization temperature through a fluid at normal temperature.

The intermittent heating device of the present invention is constituted by a heating passage 10 passing between the nozzle 5 and the molds 6 and 7. In other words, as shown in detail in Fig. 2 (see Fig. 2), the heating passage is a relatively thin round or shaped tube of the same material as that of the electrical resistance material or of stainless steel or steel. A plurality of pipes are arranged in a row, and one end of the bushing 11 is provided, the other end of the connecting end 12 is also provided, and the raw material rubber extruded from the nozzle 5 is used for this resistance heating tube ( 13 ") connects the connecting terminals 15 " and 16 " to the bush 11 and the stationary mold 7, respectively, at a unique position of the other structure in electrical close contact with the two ends thereof. Power from the variable power supply (not shown) provided externally to the two terminals 15 " " and 16 " " intermittently in response to the intermittent flow of the raw material, i.e., while the raw material is roughly flowing. Is applied to the resistance heating tube 13 ", and the joule heat is applied to this resistance heating tube 13". The raw material rubber which intermittently passes through the inside of the tube is heated and sent to the mold as described above, and a smaller diameter tube is inserted into a large diameter tube, and the gap between the plurality of tubes and The inside of the pipe may be a flow path 10 'of the raw material distribution body. The electrical resistance heating tube 13 "has a diameter of the pipe in order to speed up the heating response and improve the heating effect. It is preferable to use it by making the thickness of several thin, and to line up. In a short time before and after the rubber raw material fluid flows out of the nozzle 5 and enters the flow path 10 ', the electric power is applied to the electric resistance heating tube, and the rubber raw material is caused by Joule heat generated in the resistance heating tube. It heats up to the desired temperature which can be vulcanized in a short time, and is sent to a frame as it is. Thus, the rubber raw material passes only one injection amount, that is, the electric power is cut off within a short time before and after the moment when the raw material of the desired temperature is filled in the molding process 8. As described above, the raw material fluid to be press-fitted into the molding shop 8 can be heated to a desired constant temperature by intermittent heating power in response to the intermittent flow of the raw material rubber. In addition, the power to be applied is preferably a low-voltage high current (for example, 10V or less, 300 ~ 3000A). The electric power applied to the electrical resistance heating tube is an excessive current such that the resistance heating tube can burn within seconds, for example, but the raw material flows into the induction 16 at an appropriate timing. Since it flows rapidly while being in direct contact with the heating tube, the Joule heat generated in the heating tube is almost lost to the flowing raw material, whereby the temperature (temperature gradient) of the resistance heating tube is maintained in the range of the temperature. In addition, concerns over the quality of raw rubber due to overheating can be raised to the desired vulcanization temperature at once.

At the time of repeating the molding, if necessary, make a so-called water-collecting place (not shown) of the mold slightly larger, stagnating unnecessary parts of the residual rubber in the water-collecting place, and removing it from the molded article. You may.

In order to reduce the unnecessary portion of the remaining raw material and to make most of the raw material to be injected again, the exclusive volume of the flow path 10 'is made smaller than the raw material volume of the single injection amount, preferably the raw material volume It should be about 10% or less. According to the embodiment, 50 stainless steel pipes (seamless pipes) having an inner diameter of 1.5 mm and an outer diameter of 20 mm were used as the resistance heating tube (13 "), and raw material rubber having an injection pressure of 2500 g / cm ² was press-fitted into the mold. In addition, the entirety of the raw material rubber was attached to the inner wall of the heating tube 13 ", which caused the entire amount of flow to flow, thereby producing no scorch in the tube and maintaining a constant flow rate (flow rate) during the continuous injection. The raw material rubber can be heated to the desired temperature at the desired temperature so as to cause the claw rosin.

In addition, the resistance heating tube 13 "can also be pushed out by the injection pressure of the rubber vulcanized in the tube by the five pieces.

Since the resistance heating tube 13 "does not normally require reinforcement of another structure, the resistance heating tube 13 can be constituted only by the tube itself, and when the resistance heating tube 13" is used, The speed of the heating response in the case of applying electric power in response to the inflow and raising the raw material to a desired temperature in the flow or stopping the application of the electric power to stop the temperature increase is folk or accurate. This is particularly important in the case where only the raw material for the single injection amount injected into the chamber is heated to a desired vulcanization temperature and the subsequent raw materials are not to be affected by heat. The rapid response of the heating causes the application of the electric power by stopping the application of the electric power within one second immediately before, for example, within a few seconds of the flow of the raw material, for example, within the pipe of the resistance heating tube 13 ". The rubber raw material which is stopped in the tube and remains as it is can be avoided from scorch (ie, vulcanized), that is, unvulcanized, and can be used as a raw material for the molding of the next side. Immediately before the start of the flow, for example, within one second immediately before, the power is applied to the resistance heating tube 13 "in advance to raise the raw material for the single injection amount, including the raw material remaining in the tube, to a desired temperature. Can be sent within the frame. In this way, almost all of the rubber raw material is molded. It becomes useful to use. In addition, when the pressure resistance of the resistance heating tube 13 "cannot withstand the injection pressure, a heat-resistant electric insulation layer is formed on the outer circumference of the tube, and the insulation pipe is reinforced from the outside. It is also easy to use.

In addition to the above, it is also easy to mount the rod suitable for the inner diameter of the liquid thermosetting resin and the like, as shown in FIG. .

9 is a partially cutaway side view of another embodiment of the heating apparatus of the present invention. The heating apparatus according to the present embodiment divides the structure 9 of the heating passage 10 into two parts of the upper structure 9 'and the lower structure 9 "with the flow path 10' as a boundary. When the structures 9 'and 9 " are closed and closed, the high-pressure intermittent fluid can be press-fitted into the molding shop without any omission, and when opened, the inner surface of the flow path 10' is externally opened. It was made possible by the trip. In the example of FIG. 3, the lower structure 9 "is fixed, and the movable mold 6 shown in FIG. And the bush 11 is connected to the opening of the nozzle 5 on one side of the heating passage, that is, on the nozzle 5 side. The pipes 12 are provided respectively, and the openings through the nozzles 5, the bushes 11, the molds 8 in the molds 6, 7 and the connecting end 12 are brought into close contact with each other. Through the above, a consistent raw material path is formed.

The close contact between the nozzle 5, the bush 11, the opening of the mold, the connecting end 12, and the like may be such that the close contact between the nozzle 5 and the stopping point of the raw material can be released and separated. In addition, in the heating passage 10, a thin plate-like electric resistance heating element 13, 13 having a heat-resistant electric insulating layer 14, 14 'interposed therebetween. To place '). The electrodes 15 and 16 are connected to roughly opposite ends of the electric resistance heating elements 13 and 13 ', respectively, and the electrodes 15 and 16:15 and 16' are respectively provided. (15), (15 '): (16), (16'), (16 '), (15') (16 '") is inserted, and the heating part is electrically insulated from the structure 9 and fixed to it. Then, the conductive screws 15', 16", (15 '"), ( 16 '") in response to the intermittent flow of the raw material in a variable source (not shown) provided outside of the structure 9, i.e., while roughly flowing the raw material as before. The force is applied to the resistors 13 and 13 '. The gap between the resistive heating elements 13 and 13 'in the heating passage 10 serves as a flow path 19 through which the raw material fluid should pass. In addition, the electrode or the flow path 10 'is usually relatively narrow (for example, around 1 mm), and the raw material passing through is efficiently heated. Generally, the narrower the gap of the flow path 10' is, the more the flow path 10 'is provided. The longer the length of the raw material flow direction, the better the heating effect, but the pressure drop of the raw material fluid passing through this flow path 10 'should not be larger than the allowable range. In addition, it is necessary that the exclusive amount of the said flow path 10 'in the said heating passage is less than the above-mentioned daily injection quantity, Preferably it is 10% or less of the said daily injection quantity. Further, a plurality of media passages 17, 17 ', 18, and 18' are provided for the heating passage structure 9, and one side 17, 17 'of the media passage is provided. The fluid temperature through the nozzle 5 is roughly equal to the raw material temperature (for example, 90 ° C.) extruded from the nozzle 5, and the temperature through the other one of the media passages (18, 18) is roughly equal to the claw temperature (for example, 180 ° C.). In the same manner, the warming is given to the structure 9 in the direction of roughly the raw material passing.

Next, the heat-resistant electric insulating layers 14 and 14 'formed in the heating passage 10 will be described. These layers 14 and 14 'are, for example, a thermoelectric insulating coating layer obtained by casting or applying a thermoelectric insulating varnish such as a polyamide varnish, a modified polyester, a ternish, a silicone varnish, or the like. Or a heat-resistant electric insulating layer made of ceramic coating or enamel, glass lining or the like. Alternatively, a separately molded piece of silicon pound or the like may be substituted for the heat-resistant electric insulating layers 14 and 14 '.

Next, the electric resistance heating elements 13 and 13 'will be described. For example, nickel chromium alloys, iron-chromium-aluminum alloys, and other commercially available heat resistance materials are mainly used as thin plates. In addition to the above, for example, a general metal material which is not normally used as a heat-resisting material such as steel) or stainless may be used simultaneously. The material is formed into a resistance heating element by placing it in the heating passage 10 in the form of a line, a tubular shape, or the like, and allowing the raw material fluid to directly contact the surfaces of the heat generating elements 13 and 13 '. do.

Apart from this, a thin layer is formed on the surfaces of the resistance heating elements 13 and 13 ', for example, by coating a fluorine resin, a silicone resin, a polyamide or a ceramic and the like, and the raw material passing through the thin layer is heated. You may also do so. The thin layer provides electrical insulation, additionally attenuates the resistance during flow of the raw material fluid, and improves releasability (non-tackiness) when removing the raw material residue. Have Others are the same as those described with reference to FIGS. 1 and 2, and thus detailed descriptions thereof will be omitted. When the inner surface of the flow path 10 'which repeats the flow and stop of the raw material rubber of the example of FIG. 3 can be exposed as needed, whenever the unusable raw material rubber in the flow path 10' is molded, or It is convenient to remove as needed. In addition, as described above, the flow path 10 ′ can be formed in various shapes.

4 is an example of a system diagram related to the heating and ejection instruction of the intermittent heating apparatus of the present invention. In the drawings, both (20) and (21) indicate that the limit switches 22 and 23 respectively lower the position of the limit switch. Indicates a bar that can be shifted from side to side toward. And the limit switch 20 moves and adjusts on the bar 22, for example, when the tip part of the screw shaft 2 reaches | attains and reaches the position which cannot advance further, the limit switch 21 operates the said limit switch. It is installed so as to operate in the position of, for example, about 2 mm in the screw shaft base direction at the position of (2,0). The actuating projection 24 is fixed to the base of the screw shaft 2, and retreats like this screw shaft to operate the contacts of the two limit switches, respectively.

The operation of the contact means, for example, that the normal closing contact of the circuit (normally closed circuit) through the constant current in the limit switch is changed so that no current flows. Reference numeral 25 denotes a snap switch for instructing injection, 26 a time relay (timer) for arbitrarily adjusting the delay time, 27 an injection driving device for imparting injection lubrication to the screw shaft 2, and 28 The external commercial power source (29) represents a power switch, (30) a magnet switch, (31) a slide transformer, and (32) a step-down transformer.

4, the injection command current generated by the step switch 25 enters the limit switches 20 and 21, and the respective closing and closing sessions are performed. The electron current reaches the time relay 26 via the furnace, and the injection command is transmitted to the injection driving device 27 only late after the delay time (for example, 0.5 maximum) set by the time relay. Therefore, the start of injection by the screw shaft 2 is actually started, e. Therefore, after the start of the injection, a certain amount of raw material is injected and reaches the position where the tip of the screw shaft 2 abuts, so that the limit position 20 is operated as described above so that the injection command current is cut off and the injection drive is performed. The device stops. Then, the latter and the current passing through the limit switch 21 closes the magnet switch 30 which interrupts the commercial power supply 28 with respect to the slit lance 31. As a result, a voltage arbitrarily adjusted by the slide transformer 31 is immediately generated on the secondary side of the slite transformer 31, and this voltage is again reduced by the step-down transformer 32 to a desired low voltage, for example, 10 V or less. Is applied as a large current to the resistance heating tube 13 "of the load or the resistance speech bodies 13, 13 ', etc. Therefore, the application of electric power to the resistance heating tube 13" is carried out. Concurrent with the instruction, as described above, the injection flow of the raw material is started, for example, 0.5 seconds later. This injection lubrication continues until the end of the passage of the single injection amount, during which the raw material reaches a desired temperature, for example, about 15 seconds, while passing through the tube of the resistive heat generating tube 13 "until reaching the vapor pressure. At once, the temperature rises in the direction of the wall, and enters the cavity at the high temperature state, so that the limit position 21 is immediately before the position where the screw shaft 2 moves forward and abuts the tip, for example, just 2 mm. It operates as described above, which cuts off the current for heating to the resistive tube, and even after the available current is interrupted, the advance of the screw shaft continues and the tip of the nozzle (5) until the screw shaft is in contact. The raw material continues to be discharged by changing the limit position 20. The raw material which continues the discharge can be freely changed as much as possible. The two limit switches can be operated at substantially the same time to roughly zero the raw material which continues the discharge, and similarly, the time setting of the time relay 26 can be arbitrarily adjusted, and the delay time can be arbitrarily set to zero, for example. As described above, the reason for adjusting the timing of injection start and heating or the timing of injection end within a short time can be adjusted in this way, for example, when the injection molding is continuously dissolved. It is possible to heat up the raw material to the desired temperature from the very beginning of the flow to the raw material standing in the tube of the heat generating tube 13 "and waiting for the next flow, and to heat it just before all the raw material of a single injection amount passes. By interrupting the current, the raw material stopped in the tube can be maintained in an unvulcanized state.

Contrary to the above, the heating-dedicated current continues to be sent again within a short time after the injection flow stops, thereby remaining in, for example, the flow path 10 'of the raw material fluid in the pipe or the vacant space. It can also be vulcanized and easily removed as scrap. In this case, however, the instruction current is different from that of FIG. 4, but the method of implementation will be easily inferred from the above description.

The intermittent heating by the heating apparatus of the present invention corresponds to the intermittent flow of the raw material fluid, and roughly applies the electric power to the resistance heating element only during the flow time, and does not apply the electric power at all during the other time. It is not limited to the above, and during the other time, it transmits a small power enough to keep the flow path 10 'through which the raw material fluid should pass at a desired value, and the small power is appropriately maintained in response to the start of injection. It may be switched to.

In addition, the intermittent heating of the present invention is not limited to the intermittent heating to which electric power is applied while the injection is continued, that is, the period from when the fuel roughly flows until it stops roughly, and the raw material is continued. The electric power may be arbitrarily interrupted during this time, thereby providing a temperature difference in the raw material fluid having a single injection amount and injecting it into the molding shop. By doing in this way, the outer skin of a molded article can obtain another molded article of the physical property of a core part, for example.

The intermittent heating apparatus of the present invention is not limited to the rubbers mentioned in the above description, but for molding of various thermosetting resins which are heated during molding and accompanied by reaction, it is necessary to use rubbers and foamed articles by the various thermosetting resins. It can be used similarly at the time of manufacture. In addition, the above-mentioned temperature can be suitably used, and the like can be widely used for thermoplastic resins and other general thermoplastic resins, for example, in which sexual intercourse components are mixed.

The present invention is a simple device that can shorten the vulcanization (curing) time in rubber or other injection molding or conveying molding, etc. to 10 degrees. Thus, the molding can be stably continued, thereby not only shortening the molding cycle drastically, but also vulcanizing the entire molded article uniformly and improving the quality regardless of the thickness and the size of the molded article. Can be.

The intermittent heating device of the present invention is an advantageous invention that can be used for various applications other than the above because of its rapid and efficient heating.

Claims (1)

A device for intermittently discharging a plasticized fluid raw material controlled at a temperature that does not generate a scorch for a short time in injection molding or a transfer molding, as shown in the drawings and described in the main text, and vulcanized for a short time as a raw material. In the apparatus for heating the plasticizing fluid in part of the raw material passage connecting the claw which is kept at a relatively high temperature, the narrow passage that has a volume of less than about 10% of the primary discharge volume of the plasticizing fluid and connects with the discharge device; In order to heat up and heat the plasticizing fluid in the flow path to the same temperature as the frame of the oil-in-the-oil, the heat resistance installed in the flow path is small and the electrical resistance heating element having a large contact heat transfer area with the plasticizing fluid and the discharge device are generally plasticized. The electric resistance heating element is intermittently energized during the flow of the pyrogenic fluid, and is generally cut off the power of the plasticizing fluid. Plasticized intermittent heating apparatus for heating the liquid or the like in character and provided a control circuit injection molding or transfer molding a characteristic that made of a.

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