KR100701229B1 - Mold temperature control system for injection molding of polymer resin by rapid thermal process and method of injection molding thereby - Google Patents

Abstract

A mold temperature control system for injection molding a polymer resin by a rapid thermal process and a method for injection molding by using the same are provided to prevent a weld line from being generated by improving a flow property in the injection molding. A mold temperature control system for injection molding a polymer resin by a rapid thermal process includes a pair of molds(100,110), a hot water supplying system, a cold water supplying system, a first controller(125,135), a second controller(145,155), a temperature sensing sensor(120), and a vacuum system. A cavity represents a fixing mold and a core represents a movable mold. A fluid moving path is provided in the cavity and the core to pass the hot water and the cold water. The mold temperature control system is connected to a hot water remaining water tank(130) to play a role of separating air at the hot water discharged passing through the fluid moving path of the cavity and the core. And, each of the constitution elements of the hot water supplying system are connected to each other by a hot water supplying line and a cold water supplying line.

Description

Mold temperature control device for molding polymer resin by rapid heat treatment and molding method using the same {Mold temperature control system for injection molding of polymer resin by rapid thermal process and method of injection molding thereby}

1 is a view showing the entire mold temperature control apparatus for molding a polymer resin according to an embodiment of the present invention.

2 is a system circuit diagram illustrating in more detail the mold temperature control apparatus for molding a polymer resin according to an embodiment of the present invention.

3 is a time chart for rapid heating and rapid cooling, and shows an operation sequence and an adjustment time for each system of the present invention.

4 is a view for explaining the air discharge in the mold used in the present invention.

5 shows the structure inside the mold to prevent heat conduction in the mold.

6 illustrates in more detail the time chart of rapid heating and rapid cooling of FIG. 3.

The present invention relates to a method for manufacturing a polymer resin molded product by rapid heat treatment and to a mold temperature control device for molding a polymer resin, and more particularly, to set a mold temperature higher than a heat deformation temperature of a polymer resin to be molded, And a method of manufacturing a polymer resin molded product by rapid heat treatment to increase the production speed by having a cooling rate of 100 to 200 ° C / min and a mold temperature control for polymer resin molding to enable the rapid heat treatment. Relates to a device.

Injection molding refers to the production of a product by inserting a hydraulic resin melted into a mold by plasticizing it by applying heat to a polymer resin.

This molding is also the most widely used molding method of the polymer resin molding method in that polymer resin products can be produced very easily from small size to large products, and mass production through continuous injection is possible.

In general, molding of polymer resin has a problem in that the appearance is not beautiful due to the weld line formed when the molten resin meets inside the mold, and the glossiness of the surface is not excellent. Heating molding method that sets the temperature higher than the melting temperature of the polymer resin to be molded is widely used, for example, Japanese Patent Laid-Open No. 45-22020 (heating method by hot air), Japanese Patent Laid-Open No. 51-22759 (electric heater Heating method and water cooling method), Japanese Patent Application Laid-Open No. 55-109639 (High Frequency Oil Flow Heating Method), Japanese Patent Application Laid-Open No. 57-165229 (by blowing steam into the cavity), and Japanese Patent Application Laid-Open No. 61-79614 (cavity and core) A method of sandwiching a hot plate in between), and Japanese Patent Application Laid-Open No. 4-265720 (method of heating a mold surface by an electrically conductive layer).

However, when molding the polymer resin by setting the mold higher than the melting temperature of the polymer resin as described above, the weld line does not occur and the appearance quality is improved in terms of glossiness, but the cooling time becomes longer due to the high mold temperature and the overall molding cycle. This increases the production efficiency is lowered, there is a problem that the deformation caused by shrinkage is larger than the general injection because the polymer resin is not cooled to below the melting temperature and separated from the mold.

As described above, the mold heating methods used in the early days take a long time to heat the mold due to a low heating rate for heating the surface of the mold, thereby increasing the overall product cycle time and improving productivity. There is a problem that the cooling time is long when falling and the temperature of the mold is set to a very high temperature.

The technical problem to be achieved by the present invention is to improve the appearance gloss of the molded product by eliminating the weld line by drastically shortening the molding cycle compared to the conventional mold heating molding method by applying a rapid heating and rapid cooling method to the mold for molding. The present invention provides a method for producing a polymer resin molded product by rapid heat treatment.

Another object of the present invention is to provide a mold temperature control apparatus for molding a polymer resin capable of rapid heating and rapid cooling as described above.

Technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

In the manufacturing method of the polymer resin molded product according to the embodiment of the present invention for solving the above technical problem, the injection molding is performed by setting the temperature of the mold higher than the heat deformation temperature of the polymer resin to be molded, It characterized in that the molding cycle is shortened by allowing the cooling rate of the mold to be 100 ° C / min or more and 200 ° C / min, respectively.

Mold temperature control apparatus for molding a polymer resin according to an embodiment of the present invention for solving the other technical problem is a polymer resin molding mold, a hydrothermal storage device for storing, supplying a pressurized liquid for rapid heating the mold, hot water A pressurized liquid conveying apparatus including a pump and piping for conveying, a cooling fluid storage apparatus for storing and supplying cold water for rapid cooling of a mold, a cooling fluid conveying apparatus including a pump and piping for conveying cold water, and a pressurized liquid; And a controller for controlling the supply and discharge of cooling fluid.

However, in the control device, the pressurized liquid may be heated water, low specific heat oil, other liquids, etc., heated to 100 ° C. or higher, and pressurized to atmospheric pressure or higher. The cooling fluid may be cold water. Non-chlorine-based refrigerants such as water, ammonia, HCFC, and HFC may be used after cooling to a target temperature used in the cooling process.

However, hereinafter, the pressurized liquid is limited to hot water and the cooling fluid is limited to cold water for convenience of description.

Specific details of other embodiments are included in the detailed description and the accompanying drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only the present embodiments to make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

In addition, the size of the components constituting the invention in the drawings are exaggerated for clarity of the specification, when any component is described as "exists inside, or is installed in connection with" other components, any of the above configuration An element may be installed in contact with the other component, or may be installed at a predetermined distance from the other component, and when installed at a distance, a third element for fixing or connecting the component to the other component The description of the means of may be omitted.

In order to realize a method for producing a polymer resin molded product by rapid heat treatment according to an embodiment of the present invention, rapid heating and rapid cooling should be performed, which is a pipe in which hot water and cold water are designed to penetrate inside a molding mold. This can be achieved by flowing along the stream.

In other words, the temperature of the surface of the molding part of the molding die is rapidly heated at a heating rate of 100 ° C./min to 200 ° C./min using hot water to increase the surface temperature, and after the molding is completed, immediately supply cold water to supply 100 ° C. Rapid cooling at a cooling rate of / min ~ 200 ℃ / min is used.

In more detail, the operation of the mold is started in detail, and the mold is rapidly opened, and the mold is heated. Molding begins when the mold is set at a high temperature), where the mold is rapidly heated and the remaining hot water remaining in the tube passing through the mold is sent to the hot water residual tank using compressed air.

As the molding process proceeds, a vacuum device that extracts the compressed air in the mold is activated.After injection, the mold is cooled with cold water coming in through the tube through the mold, and when the cooling is finished, The cooling fluid is discharged to the cooling fluid tank by using compressed air. When the above method is repeated, a molded article of the polymer resin by rapid heat treatment is mass-produced.

The biggest advantage of the molding method using the rapid heating and rapid cooling as described above is that by forming the mold temperature higher than the heat deformation temperature of the polymer resin to be molded, the polymer resin to be molded to improve the fluidity inside the injection mold weld There is no weld line, and the surface gloss of the molded product is very excellent, so that a high quality molded product can be obtained. In addition, it is possible not to cool the molded product outside the mold after molding, but to allow the molded product to be cooled inside the mold to improve post-deformation occurring after molding, and such heating and cooling processes may be performed at 100 ° C / min to 200 ° C. The process cycle can be dramatically shortened by the rapid heating and rapid cooling methods per minute.

In the above, the pressurized liquid injection line and the cooling fluid injection line are preferably designed in the same line in terms of simplifying the device and increasing the degree of freedom of design of the mold. Also, after the forming process is completed using the pressurized liquid in order to increase the thermal efficiency, Before cooling with cold water, the pipe is purged with air, nitrogen, or inert gas, and then cold water is introduced, and after the cooling process is completed, the pipe is heated again with hot water. The remaining cold water is purged with air, nitrogen, or an inert gas to supply hot water.
In addition, it is preferable to maintain a predetermined time at a predetermined temperature set in the temperature control of the rapid heating and rapid cooling method.

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As described above, if it is maintained for a predetermined time at a predetermined temperature set in the temperature control of the rapid heating and rapid cooling method, in the first heating aspect, the raw material cools on the surface during the molding process and can be prevented from solidifying. There is an effect to prevent the heat of the raw material injected into the molding portion during the molding process to be discharged to the outside, and secondly, in the aspect of cooling, the molded product is ejected to the outside in a sufficiently cool state inside the mold In this way, the molded article can be prevented from being deformed after discharge.

Hereinafter, the operation principle of the mold temperature control apparatus for polymer resin molding and the structural drawing of the mold to enable rapid heat treatment of the present invention will be described with reference to specific drawings.

1 is a view showing the entire mold temperature control apparatus for molding a polymer resin according to an embodiment of the present invention.

Referring to FIG. 1, a mold temperature control apparatus for molding a polymer resin according to an exemplary embodiment of the present invention includes molds 100 and 110 fixed in a molding die, a hot water supply system, a cold water supply system, and a first controller 125 and 135. ), Second controllers 145 and 155, temperature sensor 120, and a vacuum system.

Cavity 100 refers to a mold which is fixed in a molding die, and core 110 refers to a moving mold. In addition, the cavity 100 and the core 110 have a fluid movement passage that allows the hot and cold water to pass therein. A detailed description of the fluid movement passage will be described later.

The hot water supply system is a system for supplying hot water to the fluid movement passages inside the cavity 100 and the core 110. The cavity 100 and the core 110 are heated at a temperature of 100 ° C./min to 200 ° C./min. Rapid heating function.

The hot water supply system is connected to the hot water residual tank 130 and the hot water residual tank 130 which serve to separate air from the hot water discharged through the fluid movement passages of the cavity 100 and the core 110. And a heater tank connected to the hot water auxiliary tank 140 and the hot water auxiliary tank 140 for storing the hot water until the hot water is supplied to the cavity 100 and the core 110 and heating the hot water to a predetermined temperature ( Heater tank 150, and a hot water pump 160 to pressurize the hot water between the hot water auxiliary tank 140 and the heater tank 150 to have a constant flow rate, the components of such a hot water supply system They are connected to each other by hot water supply line (H1) and hot water discharge line (H2).

The cold water supply system supplies cold water to the fluid movement path of the cavity 100 and the core 110 to cool the cavity 100 and the core 110 heated by the hot water supply system at 100 ° C./min to 200 ° C./min. It is a system for rapid cooling at speed.

The cold water supply system is connected to the drainage auxiliary tank 170 and the drainage auxiliary tank 170 to which the pipe separating the air from the cold water discharged through the fluid movement passage of the cavity 100 and the core 110 is connected to the cold water supply system. Cooling tower 180 for cooling the temperature below a predetermined temperature, Cold water auxiliary tank 190, Cold water auxiliary tank for storing cold water until the cold water cooled in the cooling tower 180 to the cavity 100 and the core 110 It includes a booster pump 191 for pressurizing the cold water coming from the 190 to have a constant flow rate, the components of the cold water supply system of the cold water supply line (C1) and the cold water discharge line (C2) It is connected.

The first controller 125, 135 is installed at the point where the hot water supply line (H1) and the cold water supply line (C1) meets, and comprises a cavity supply line controller 125 and the core supply line controller 135.

The cavity supply line controller 125 is a control for supplying cold water and hot water to the cavity 100 by supplying hot water from the heater tank 150 and cold water from the cold water auxiliary tank 190, and the cavity 100. In the case where heating is required, the control unit is configured to supply hot water to the cavity 100, and to supply the cold water to the cavity 100 when the cavity 100 needs cooling. The hot and cold water passing through the cavity supply line controller 125 is supplied to the cavity 100 using one supply line 126.

The core supply line controller 135 is a controller for supplying cold water and hot water to the core 110 by supplying hot water from the heater tank 150 and cold water from the cold water auxiliary tank 190. In the case where heating is required, the control unit is configured to supply hot water to the core 110, and to supply the cold water to the core 110 when cooling is required to the core 110. Hot water and cold water that have passed through the core supply line controller 125 are supplied to the cavity 100 using one supply line 136.

The second controllers 145 and 155 are installed at the point where the hot water discharge line H2 and the cold water discharge line C2 meet, and include a cavity discharge line controller 145 and a core discharge line controller 155.

The cavity discharge line controller 145 is supplied with the hot water and cold water from the fluid movement passage of the cavity 100, and when the hot water is discharged, the hot water is sent to the hot water residual tank 130 of the hot water supply system, and the cold water When discharged to serve each of the hot water to the drainage auxiliary tank 170 of the cold water supply system. Hot water and cold water passing through the fluid movement passage of the cavity 100 are introduced into the cavity discharge line controller 145 through one drain line 146.

The core discharge line controller 155 is supplied with hot water and cold water from the fluid movement passage of the core 110, and when the hot water comes out of the core 110, it sends hot water to the hot water residual tank 130 of the hot water supply system. And, when cold water comes out from the core 110 serves to send the cold water to the drainage auxiliary tank 170 of the cold water supply system, respectively. Hot water and cold water that pass through the fluid movement passage of the core 110 are introduced into the core discharge line controller 155 through one drain line 156.
However, when the cavity supply line controller 125 is operated, the cavity discharge line controller 145 is interlocked to operate. When the core supply line controller 135 is operated, the core discharge line controller 155 is interlocked. It is desirable to allow it to work.

The temperature sensor 120 is directly attached to the cavity 100 and the core 110 to detect the temperature of the cavity 100 and the core 110, and when heating is required, the first controller 125 and 135 are in the cavity. The hot water is supplied to the 100, and when cooling is required, the first controller 125 and 135 serve to transmit an electrical signal to supply the cold water to the cavity 100.

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The vacuum system serves to drain residual air into the cavity 100 and the core 110, and the vacuum line 176 connected to the cavity 100 and the vacuum line 177 connected to the core 110 are removed. The air in the cavity 100 and the core 110 is discharged through the vacuum lines 176 and 177, and the vacuum lines 176 and 177 are connected to the vacuum tank 175 in which the vacuum state is maintained by the vacuum pump 165.
This vacuum system maximizes the molding efficiency of the resin to be molded and contributes to shortening the molding cycle.

The compressed air supply source 113 shown in Figure 1 serves to discharge the hot and cold water remaining in the cavity 100 and the core 110 to the hot water residual tank and the cooling fluid tank, respectively.

2 is a system circuit diagram illustrating in more detail the mold temperature control apparatus for molding a polymer resin according to an embodiment of the present invention.

Referring to FIG. 2, the temperature sensor 120 is mounted near the molding part where the cavity 100 and the core 110 meet each other (two to twelve temperature sensors are mounted), and the temperature sensor 120 is detected. Manage the temperature.

As shown in Figure 2, the mold temperature control apparatus for molding a polymer resin according to an embodiment of the present invention is divided into a hot water supply line and a hot water drainage line, and a cold water supply line and a cold water drainage line, the air inside the mold The pipeline system is shown as a line for subtraction.

In order to increase the temperature of the molds 100 and 110, the hot water auxiliary tank (HWAT), the hot water pump (HWP), the hot water tank (HWT) in which the heater operates, and the hot water switching valve (HSV 1 and 2) It passes through the check valve and the mold, returns to the hot water auxiliary tank (HWAT) through the non-return valve and the hot water switching valve (HSV3, 4), and the hot water circulates continuously and the temperature detected by the sensor in the mold When the temperature reaches the set temperature, the hot water pump (HWP), the hot water conversion valve (HSV1, 2, 3, 4) is stopped and sends an injection command to the molding machine.

The molding machine that has received this command starts molding immediately. At this time, the hot water supply system stops the hot water remaining in the inside of the mold and the pipe and hose through the backflow prevention valve to the hot water residual tank (DHWAT). ASV1,2, AHS1,2) are opened and sent, and the hot compressed air entering the DHWAT is discharged to the cold water drain line through the non-return valve and the air exhaust valve (WLSV3). The end signal is set by the system controller and set to open and then stops after 0.1 ~ 10 seconds. After the injection end signal is received from the injection machine, the system starts rapid cooling.

At this time, cold water is supplied from outside (cooling tower, cooler) to pass through cold water auxiliary tank (CWAT), cold water boost pump (CWP), cold water switching valve (CSV1, 2), non-return valve (check valve), mold and It is discharged to the outside through the drain auxiliary tank (CWAT1) and the drain pump (CWP1) through the prevention valve and the cold water switching valve (CSV3, 4).
At this time, if there is no reverse load (back pressure) in the drain line, the cold water can be discharged to the bypass pipe, and if there is a reverse load or to increase the cooling rate, the drain auxiliary tank (CWAT1) and the drain pump (CWP1) are operated. It is preferable.
When the mold cooling reaches the set temperature, the cold water boost pump (CWP), the cold water switching valves (CSV1, 2, 3, 4) and the drain pump (CWP1) are stopped and the compressed air is supplied to the cooling fluid remaining in the mold fluid line. To the outside.

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After the cooling and residual cooling fluid removal process is completed, the molding machine opens the mold to take out the molded product. When the mold starts to open, the hot water is restarted from the starting point.
The vacuum apparatus starts to operate by receiving a signal from the molding machine when the molding is started, and improves moldability by removing the retained gas compressed in the mold by adjusting the vacuum waiting time and the vacuum running time. The vacuum device discharges the compressed gas inside the mold at a high speed through the filter (F), the non-return valve, the vacuum tank (VCT), the non-return valve and the vacuum pump (VCP). The operation of the vacuum pump (VCP) is operated by a vacuum switch attached to the vacuum tank (VCT).
If there is no medium in the hot water auxiliary tank (HWAT) or hot water tank (HWT), the medium supply valve (WLSV1) and the air exhaust valve (WLSV2, 3) are operated by the water level sensor (WL1, 2) according to the detection state. Replenishing the medium, the temperature control of the hot water tank (HWT) is sensed by the sensor (sensor1) to operate the heater (heater) to manage the temperature.

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3 is a time chart for rapid heating and rapid cooling, and shows the operating procedure and adjustment time for each system of the present invention.

As shown in FIG. 3, the hot water is added while the mold starts to open, and heating of the mold is started, and all the apparatuses are operated and stopped as in the time chart of FIG. 3.
The dotted line inside the table at the bottom of Figure 3 is a variable adjustable portion.
The hot water recovery and cold water recovery steps mean a process of removing the media remaining in the mold, the pipeline, and the hose, and the time can be adjusted together with the air suction valve (VCSV1, 2) process.

4 is a view for explaining the air discharge in the mold used in the present invention.
Referring to FIG. 4, when two or more protrusions, holes, grooves, ribs, bosses, and the like have two injection holes, weld lines are formed where resins meet each other. When the resin is supplied in both directions, air from the mold and gas generated from the heated resin start to be compressed. After the resin is injected into the mold to some extent, the vacuum wait time and the vacuum run time are adjusted to adjust the vacuum.
As the molding proceeds, the gas collects in the weld line, so the gas vent is positioned at the weld line, a groove and a hole are drilled inside the core, and a nipple is mounted on the outer wall of the mold to connect with the vacuum apparatus.

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5 shows the structure inside the mold to prevent heat conduction in the mold.

Referring to FIG. 5, when the rapid heating and the rapid cooling are performed, the molded part of the mold should be subjected to rapid thermal conduction, so that the heat conduction rate decreases when heat is conducted to the opposite side of the molded part. In this case, the amount of heat is excessively consumed to increase the loss of thermal energy, and the amount of heat is lost because the quantity of water is passed through a small pipe, so that the amount of heat lost is increased, resulting in a long heating and cooling time, thereby increasing the production cycle of the molded product.
As shown in the detailed drawing of the heat insulating material deposition at the lower right of FIG. It can maximize the insulation effect.
In order to insulate the sides and the rear side of the heating / cooling medium pipeline as shown in the lower left of FIG. 5, a plurality of holes may be drilled and installed to insulate the insulating rod.
According to the structure of the mold as shown in the upper right of FIG. 5, the passage of the heating / cooling medium enters the molded part core through the disc (mold), and the method directly enters the molded part core. Passing directly through the core of the molded part is faster than the moving speed and heat exchange rate of the medium, but it follows the proper method according to the mold design and the structure of the molded product.
Using such a selective insulation structure can be heated / cooled only by the energy supply of 2/5 to 1/2 compared to the existing device, the heating and cooling rate is also reduced by 10 to 20%.

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6 illustrates in more detail the time chart of rapid heating and rapid cooling of FIG. 3.

6 shows the media temperature and the actual mold temperature. The heating starts from the beginning of opening the mold and when the temperature in the mold reaches the set temperature, the supplied hot water is stopped and the residual hot water is removed by compressed air. When the cooling is completed, the cooling process is performed by supplying cold water, and when the cooling is completed, the process proceeds in the order of removing residual cold water by compressed air. However, if the temperature sensor attached to the mold is broken or the sensor is not attached, it can be controlled by the time controller attached to the controller.

At this time, as shown in FIG. 6, the molding process of the injection molding machine and the electrical signal are interfaced with each other.

To remove residual hot water and residual cold water using compressed air, if the medium previously carried out remains in the mold, pipe, and hose, the hot water turns into cold water tank and cold water turns into hot water tank. The system is configured to process hot water and cold water to the cold water tank.

Hereinafter, by using the mold temperature control apparatus for molding a polymer resin according to an embodiment of the present invention, the energy efficiency is improved and the heating and cooling time is shortened to explain the specific experimental examples that the overall product production cycle is shortened. . Details not described herein are omitted because they can be sufficiently inferred by those skilled in the art.

Table 1 shows the results of comparing the monthly average heating energy use amount, cooler operation cost, and product production cycle time when the system (boiler, diesel) and the system according to the present invention are used. In both systems, the cost of energy injected per month was compared assuming that the amount of resin injected was about 500 g per cycle.

표 1에 나타난 바와 같이 월평균 가열에너지 사용금액, 냉각비가동비 및 제품생산사이클 시간 모든 측면에서 본 발명에 의한 시스템이 종래의 시스템에 비해 우수하다는 것을 알 수 있다. 구체적으로는 가열 및 냉각을 위한 에너지 비용은 종래기술보다 월 2,400만원 이상의 비용절감 효과가 있으며, 생산 사이클은 약 13%가 단축되는 우수한 효과가 있는 것을 확인할 수 있다.
이와 같은 우수한 효과는 금형 내부에 잔류하는 열수를 압축 공기 등을 사용하여 퍼지함으로써 공정사이클을 단축시키고, 진공장치를 사용함으로써 금형의 가열온도를 약 8~10℃ 낮춤으로써 얻어진 것이다.
즉, 진공장치 없이 성형품 내부의 공기를 제거하기 위해서는 금형을 일정온도 이상으로 계속 가열하여야 하는 반면, 진공장치를 이용하면 별도로 가열하지 않더라도 성형품 내부의 공기를 제거할 수 있어서 금형의 가열온도를 낮출 수 있고 공정사이클도 10~20% 더 단축시킬 수 있다.

As shown in Table 1, it can be seen that the system according to the present invention is superior to the conventional system in terms of monthly average heating energy use amount, cooling operation ratio and product production cycle time. Specifically, the energy cost for heating and cooling has a cost-saving effect of more than 24 million won per month compared to the prior art, and it can be seen that the production cycle has an excellent effect of shortening about 13%.
This excellent effect is obtained by shortening the process cycle by purging the hot water remaining in the mold using compressed air or the like, and lowering the heating temperature of the mold by about 8 to 10 ° C by using a vacuum apparatus.
In other words, in order to remove the air inside the molded article without the vacuum device, the mold must be continuously heated above a certain temperature, while the vacuum device can reduce the heating temperature of the mold by removing the air inside the molded product even without heating separately. And the process cycle can be further reduced by 10 – 20%.

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According to the above, the method of manufacturing the polymer resin by the rapid heat treatment according to the present invention and the polymer resin mold temperature control device are limited to the molding. However, the rapid heat treatment method and the mold temperature control device according to the present invention include a transfer molding method, It can also be used for compression molding, reactive molding, blow molding, thermoforming and the like. As the molding method, in addition to the usual molding method, injection molding method, localized heat-pressing method, gas press method, gas assist method, blow molding method, sandwich molding method, two-color molding method, in-mold molding method, push-pull molding method , High-speed molding method.

Examples of the raw material resin that can be molded by the mold temperature control apparatus for molding a polymer resin according to the present invention include polyvinyl chloride (a resin composition including a hard resin and a soft resin, hereinafter, homologous), an acrylic ester resin (acrylic acid as acid, meta, and meta). Krillic acid and the like, substances containing methyl group, ethyl group, etc. as alkyl group), polystyrene (general type, high impact resistance type, etc.), acrylonitrile-styrene resin, acrylonitrile-butadiene-styrene resin, modified polyphenylene oxide, Amorphous polymer resins such as polycarbonate, polysulfone, polyacrylate, polyetherimide, polyethersulfone, polyethylene (low density, linear low density, medium density, high density, etc.), polypropylene (homopolymer, random polymer, block polymer, etc.) ), Polybutene-1, polymethylpentane-1, polyfluorocarbon (polyvinylidene fluoride, etc.), polyoxymethylene, polyamide (6,66, etc.) ), Crystalline polymers such as terephthalic acid ester resins (polyethylene terephthalate, polybutylene terephthalate, etc.), polyphenylene sulfide, polyether ether ketone, polyether ketone, polyimide, liquid crystal polymer (aromatic polyester, aromatic polyester) Amides, etc.), epoxy resins, melamine resins, phenol resins, urea resins, unsaturated polyester resins, polyurethane, silicone resins, thermosetting resins such as alkyd resins, alloys or fillers (particulate fillers such as talc, fibers such as glass fibers) Shape material), the compound of the resin (compound) and the like.

 Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments but may be manufactured in various forms, and having ordinary skill in the art to which the present invention pertains. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

According to the method for manufacturing a polymer resin molded product by rapid heat treatment and a mold temperature control apparatus for molding a polymer resin according to an embodiment of the present invention, the polymer resin to be molded has improved fluidity inside the injection mold, thereby improving a weld line. It does not occur, and also has the advantage that the surface gloss of the molded product is very excellent to obtain a high quality molded article. In addition, it is possible to improve the post-deformation generated after molding by cooling the molded product inside the mold instead of cooling the molded product outside the mold after molding, and the heating and cooling process is 100 ° C / min to 200 ° C. The process cycle can be dramatically shortened by proceeding in a rapid heating and rapid cooling manner per minute.

Claims (16)

In the mold temperature control device for polymer resin molding, A transfer pipe that allows the heating liquid and the cooling fluid to alternately circulate into the same pipe in the mold; A vacuum apparatus for maintaining the inside of the mold in a vacuum state; A heating liquid storage device for storing and supplying a heating liquid for rapidly heating the mold; A heating liquid transfer device including a pump and a pipe for transferring the heating liquid; A cooling fluid storage device for storing and supplying cold water for rapidly cooling the mold; A cooling fluid transfer device including a pump and a pipe for transferring the cold water; Compressor supply device for forcibly removing the heating liquid or cooling fluid remaining in the mold; And And a controller for controlling the supply and discharge of the heating liquid and the cooling fluid, wherein the rapid heating and rapid cooling of the mold is performed in a range of 100 ° C./min to 200 ° C./min. The method of claim 1, The heating liquid is a mold temperature control device for molding a polymer resin, characterized in that the pressurized hot water (heated water). The method of claim 1 The cooling fluid is a mold temperature control device for molding a polymer resin, characterized in that the cooling water (cooling water). The method of claim 1, Mold temperature control apparatus for molding a polymer resin, characterized in that the fluid movement passage is formed in the mold. The method of claim 1, Mold temperature control apparatus for molding a polymer resin, characterized in that the heating fluid supply line and the cooling fluid supply line in the mold using the same line. delete delete The method of claim 1, Mold temperature control device for molding a polymer resin, characterized in that for maintaining a temperature for a predetermined time at a temperature set in the temperature control of the rapid heating and rapid cooling method. The method of claim 1, Mold temperature control device for molding a polymer resin, characterized in that the temperature sensor is attached to the mold. delete The method of claim 1, A first controller configured to control the controller to alternately supply heating liquid and cold water to a mold; And a second controller configured to separate and discharge the heating liquid and the cold water, respectively. The method of claim 1, Molding temperature control apparatus for molding a polymer resin, characterized in that the heating liquid storage device further comprises a heating device for heating the heating liquid to 100 ℃ or more. The method of claim 1, Mold temperature control apparatus for molding a polymer resin, characterized in that the cold water storage device further comprises a cooling device for cooling the cold water. Rapid heating by supplying a heating liquid to a mold for molding a polymer resin; Supplying a resin to be molded to the mold while maintaining the mold in a vacuum state; Maintaining the temperature at which the heating liquid is held in the mold; Discharging the heating liquid and purging the residual heating liquid using the compressor liquid; Rapid cooling by supplying a cooling fluid to a mold for molding a polymer resin; Maintaining a constant temperature by allowing the cooling fluid to remain in the mold; Discharging the cooling fluid and purging the residual cooling fluid using the compressor fluid; And Including the step of removing the molded injection molded product, the molding is carried out by setting the temperature of the mold higher than the heat deformation temperature of the polymer resin to be molded, the heating rate and cooling rate of the mold to 100 ℃ / min to Molding method of the polymer resin adjusted to the range of 200 ℃ / min. delete delete

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