KR20230073026A - Local injection mold exhaust device having exhaust gas module and gas exhaust method using the same - Google Patents

Abstract

Disclosed contents relate to an injection mold gas exhaust device having a local exhaust gas module and a gas exhaust method using the same. Provided is an injection mold gas exhaust device, comprising: an injection unit (1) which comprises a moving mold (12) and a fixed mold (11) forming a molding space (121) and has an exhaust path (122) and a nipple (21) provided inside the fixed mold (12); and an exhaust gas module (2) which forms an exhaust line (21) and a compressed air line (24), separately, from the nipple (21), and comprises a venturi unit (22), having a high pressure input unit (221) with an expanded caliber connected and an exhaust pipe unit (224) connected, constituting a low pressure neck unit (222) with a pipe diameter narrowed and forming an expanded discharging unit (223) on the other side of the low pressure neck unit (222) and the exhaust pipe unit (224) having the exhaust line connected on a lower side of the low pressure neck unit (222), a discharging unit (23) connected to the expanded discharging unit (223) to make a filter (233) filter exhaust air, a tar removing unit (26) installed between the exhaust pipe unit (224) and the exhaust line (21) to remove tar contained in the exhaust gas, and a pressure gauge (25) displaying a pressure of the exhaust gas of the exhaust line (21). In addition, a gas exhaust method of an injection mold using the same is provided. According to the present invention, productivity can be improved.

Description

Injection mold exhaust device having a local exhaust gas module and gas exhaust method using the same {Local injection mold exhaust device having exhaust gas module and gas exhaust method using the same}

The present invention relates to an injection mold exhaust device having a local exhaust gas module capable of easily discharging gas generated during injection molding and a gas exhaust method using the same.

In general, injection molding is known as a method of molding and processing plastic products (or parts). In such injection molding, liquid resin injection molding (LIM: Liquid Injection Molding) is known in which a liquid thermosetting resin (liquid raw material resin, hereinafter referred to as liquid resin or molten resin) is injected into a high-temperature mold and thermally cured. . This method is a molding method in which liquid raw material resin is injected into a high-temperature mold and cured by heating.

On the other hand, a hot runner device for injecting molten resin into a molding groove (molding space, hereinafter referred to as a cavity) of a mold in a mold device (having a cylinder or a runner through which hot molten resin moves and injecting molten resin) A device having a valve that opens and closes, and the valve injects molten resin into the mold through a nozzle) is also known.

In the injection mold used for injection molding of these synthetic resin products, cavities and runners (cylinders) are formed on the adjacent surfaces of upper and lower cavity plates (which can be referred to as moving molds and fixed molds) that are stacked in the vertical direction to form the upper and lower cavities. An injection-molded product of a synthetic resin material corresponding to the shape of the cavity may be manufactured by injecting molten resin into the cavity through the runner in a state in which the plates are engaged with each other.

As another injection molding apparatus, an injection molding apparatus composed of a fixed mold to which a movable mold is moved and adhered to, and an injection injecting molten resin into an injection runner of the fixed mold is also known. In this molding device, when the rod of the cylinder moves in extension, the moving die plate mounted on the end of the rod moves to the other side of the moving mold disposed on one side of the molding device, so that the moving mold fixed to the moving die plate moves toward the fixed mold on the other side. As the movable mold adheres to the fixed mold, the space formed between the fixed mold and the movable mold is closed by the fixed mold and the movable mold, thereby forming a sealed molding space (cavity) for injection. In the molding space, molten resin is injected into the runner of the fixed mold by injection.

On the other hand, the resin material injected into this molding device is plasticized (internal plasticization by hybridization with a polymer unit having a low glass transition temperature by imparting plasticity to the resin and external plasticization by adding a plasticizer, etc.) process ( The plasticized molten resin solution, which has undergone plasticization step), is charged as a cylinder of an injection molding machine. This process may be referred to as a cylinder filling step.

After that, the molding space is filled with the melted resin (while maintaining a constant pressure in the melted resin plasticized in the mold space, the gate (entrance) passes an appropriate amount of time and solidifies the melted resin, then the plasticized melted resin is returned to the cavity of the mold). Then, after moving the moving mold to the other side, the injected molded product is ejected to take out the injection molding.

In the conventional injection molding apparatus configured and operated as described above, molten resin is injected through injection and injection runners, and in the process of filling the molding space with the molten resin, the air in the molding space is discharged to the outside through the gap of the injection. At this time, the air that has not come out remains in the molding space. That is, air remains in the deep part of the product, such as a boss or rib, or at a point where air is difficult to escape, such as a weld part.

In this way, when the air outflow rate in the mold is slow compared to the inflow rate of the molten resin into the mold, and the air cannot escape and remains, the area where the residual air exists is momentarily adiabatic compressed and the resin is burned. A burn phenomenon appears, or a black streak phenomenon, a defect phenomenon in which black lines occur on injection molded products, appears. In addition, phenomena such as the presence of unmolded parts, occurrence of blistering, weakening of weld line strength, and deterioration in surface gloss quality of molded products also occur. In addition to these defects, in terms of quality of injection-molded products, problems with the material and shape of products caused by residual air occur, and human hazards due to toxic exhaust gases and problems that deteriorate atmospheric air quality there was also

In order to solve this problem, gas vents (holes for gas exhaust) are installed to communicate the cavity and the outside of the mold so that the gas in the cavity of the mold does not remain in the molded product. However, since the viscosity of the raw resin during injection molding is also low, when the diameter of the gas vent is increased, the raw resin flows into the gas vent, and burrs made of the resin flowing into the gas vent tend to occur in the molded product. There are problems, such as the need to remove burrs after molding, and the post-process for removal to occur again.

In addition, during injection molding, there was a problem in that the gas generated as the molten resin melted in the cavity (molding groove, molding space) was scattered at the injection site through the gas exhaust groove (hereinafter referred to as the exhaust passage) of the injection mold, and this scattering The material contains foreign substances such as tar, which has generated harmful substances harmful to the human body, or some of the gas flows back into the mold and affects the solidification of the mold, shortening the life of the mold, and in the process of forming a gas exhaust structure It also acted as a load burden on the injection molding machine and shortened the life of the injection molding machine.

Korean Intellectual Property Office Registered Patent Publication No. 10-0157226 Republic of Korea Intellectual Property Office Registered Patent Publication No. 10-1373447 (Announced on March 13, 2014) Korean Intellectual Property Office Registered Patent Publication No. 10-1575574 (published on December 8, 2015)

(Patent Publication Document 0001) Korean Intellectual Property Office Patent Publication No. 10-2020-0043806 (published on April 28, 2020) (Patent Publication Document 0002) Korean Intellectual Property Office Patent Publication No. 10-2020-0047025 (published on May 07, 2020)

The present invention has been made to solve the above problems, by lowering the injection pressure (pressure control) to improve deformation, weld line, shrinkage, and parting line burr generation, and to reduce injection density deviation to improve warpage and strength The purpose is to provide an injection mold gas exhaust device having a local exhaust gas module to improve productivity by shortening the injection time, improve release property by easy cooling, and a gas exhaust method using the same. there is,

The present invention is a local exhaust that can easily implement a suction structure in an injection mold to improve and discharge problems (exhaust of unnecessary residual gas that causes defects in injection production) due to existence without being able to escape from the molding space in the injection mold. Another object is to provide an injection mold exhaust device having a gas module and a gas exhaust method using the same.

The present invention can be confirmed through pressure gauges capable of displaying the pressure (positive pressure, negative pressure, differential pressure) of each part such as the exhaust line as well as the compressed air line and the discharge side through the exhaust method of the injection mold. Another object of the present invention is to provide an injection mold gas exhaust device having a local exhaust gas module capable of monitoring and controlling exhaust conditions in real time and a gas exhaust method using the same.

The present invention allows the internal pressure of the exhaust gas to form a negative pressure (-15 kPa or less, negative air-pressure) through the venturi part to which Bernoulli's theorem is applied, and the suction pressure of the compressed air to be at least -50 kPa or less than the atmospheric pressure, Its purpose is also to provide an injection mold exhaust device having a local exhaust gas module with a reach time of less than 1 second and a 50% reduction in the defect rate of the injected product compared to the conventional one, and a gas exhaust method using the same.

Injection mold exhaust device having a local exhaust gas module of the present invention for achieving the above object,

It consists of a fixed mold and a movable mold forming a molding space, and has a cylinder for injecting molten resin, which is a molding material, into the molding space, and an exhaust passage connected to the inside of the fixed mold so that gas is exhausted through communication with the molding space. an injection unit forming a vertical connection passage and having a nipple formed at an end of the exhaust passage; and

An exhaust line is formed from the nipple, and a compressed air line is formed separately from the exhaust line. A high pressure input unit having an enlarged diameter is connected to the compressed air line side, and an exhaust pipe unit is connected to the exhaust line side. A venturi part forming a low-pressure neck portion with an extended input portion but a narrowed pipe diameter, an expanded discharge portion formed on the other side of the low-pressure neck portion, and an exhaust pipe portion to which the exhaust line is connected to the lower side of the low-pressure neck portion;

A discharge unit connected to the expanded discharge unit and filtering the discharged air as a filter;

A tar removal unit installed between the exhaust pipe unit and the exhaust line to remove tar contained in the exhaust gas;

an exhaust gas module comprising a pressure gauge displaying the pressure of the exhaust gas in the exhaust line;

It can be achieved as an injection mold gas exhaust device having a local exhaust gas module including and a gas exhaust method using the same.

Injection mold exhaust device having a local exhaust gas module of the present invention for achieving the above object,

a heat sink installed by forming a cooling fin between the exhaust line and the exhaust pipe part of the venturi part;

A tar collection container installed below the heat sink to collect the cooled tar; and

A tar collection valve forming an opening and closing cone installed at the bottom of the heat sink to open and close the inlet of the tar collection container;

It is preferable to achieve as an injection mold exhaust device having a local exhaust gas module including and a gas exhaust method using the same.

The pressure gauge of the exhaust gas module of the gas exhaust device of the injection mold having the local exhaust gas module of the present invention for achieving the above object,

a first pressure gauge displaying a negative pressure on the exhaust line;

a second pressure gauge displaying the pressure through which compressed air pressure (positive pressure) passes; and

a third pressure gauge displaying a discharge pressure (differential pressure) of the venturi unit;

It can be achieved as an injection mold exhaust device having a local exhaust gas module including a.

The discharge part of the injection mold exhaust device having the local exhaust gas module of the present invention for achieving the above object,

a filtration filter mounted in a casing forming the discharge portion;

a washing water supply unit installed above the casing;

A washing water spray nozzle connected to a washing water supply unit within the casing to spray washing water; and

a drain valve installed below the casing and installed on the bottom of the casing to drain foreign substances separated from the filter;

It is preferable to achieve as an injection mold exhaust device having a local exhaust gas module including.

In order to achieve the above object, a gas exhaust method using an injection mold exhaust device having a local exhaust gas module according to the present invention,

A molten resin preparation step (S1) of adding a plasticizer to the molten resin to plasticize it;

A cylinder filling step (S2) of filling the prepared molten resin into an injection molding machine cylinder;

A cavity filling step (S3) of pressurizing and injecting molten resin into the cavity of the injection mold;

A gate solidification step (S4) of solidifying the gate of the injection mold while maintaining a constant pressure of the plasticized molten resin in the cavity of the injection mold;

A cooling step (S5) of solidifying the plasticized molten resin in the cavity of the injection mold; and

After the cooling is complete, an ejection step (S6) of separating the injection mold and taking out the solidified product;

including,

In the cylinder filling step (S2),

A pressure control step (S21) of controlling the pressure to a normal pressure (positive pressure) for a predetermined time while checking the pressure through a pressure gauge;

including,

In the cavity filling step (S3),

A negative pressure control step (S31) in which the pressure is controlled through a pressure gauge to be in a vacuum pressure (negative pressure) state; and

A gas exhaust step (S32) of exhausting gas in a negative pressure state;

including,

The gas exhaust step (S32),

Injection with a local exhaust gas module including a tar removal step (S321) in which the tar contained in the exhaust gas of the exhaust line is cooled by a heat sink equipped with a cooling fin and the cooled tar is collected in a lower tar collection container. It can be achieved by the gas exhaust method using the gas exhaust device of the mold.

The gas exhaust step (S32) of the gas exhaust method using the injection mold exhaust device having the local exhaust gas module of the present invention for achieving the above object is,

It may be preferable to carry out by a gas exhaust method of an injection mold including a filter washing step (S322) of washing foreign substances accumulated in the filter with the washing water spray nozzle and draining them through the bottom drain valve.

An injection mold exhaust device having a local exhaust gas module according to a preferred embodiment of the present invention,

A high-pressure input unit connected to a compressed air line, a low-pressure neck unit having a narrow neck so that compressed air passing through the high-pressure input unit passes at high speed while forming a low pressure, and a low-pressure neck unit connected to exhaust gas from the exhaust line below the low-pressure neck unit. By constructing the exhaust pipe part and the venturi part composed of the exhaust gas intake and discharge part for discharging the exhaust gas from the low-pressure neck part, an effect of discharging gas generated during injection molding according to Bernoulli's theorem is obtained.

The injection mold exhaust device having a local exhaust gas module and the gas exhaust method using the same improve deformation, weld line, shrinkage, and parting line burr generation that occurred in conventional resin injection molding products, and reduce injection density deviation to reduce warpage. , strength is improved, productivity is improved by shortening the injection time, and quality is improved by improving release properties by facilitating cooling.

An injection mold exhaust device having a local exhaust gas module and a gas exhaust method using the same according to a preferred embodiment of the present invention have problems due to existence without being able to escape from the molding space in the injection mold (emission of unnecessary residual gas causing defects in injection production) ) to obtain the effect of easily implementing a suction structure for discharging by improving the injection mold.

In the gas exhaust device of an injection mold having a local exhaust gas module and a gas exhaust method using the same according to a preferred embodiment of the present invention, the pressure (negative pressure) of the injection mold exhaust process can be checked through a pressure gauge, so that the pressure of compressed air can be checked. It can be controlled to provide a smooth local gas exhaust module, and it is possible to implement a pressure line of an injection mold using this.

An injection mold exhaust device having a local exhaust gas module and a gas exhaust method using the same according to a preferred embodiment of the present invention can check the pressure (negative pressure) of the injection mold exhaust process through a pressure gauge, and converts the pressure of compressed air to a positive pressure can be controlled, so it is possible to realize a stable pressure line for injection molding. In particular, the pressure difference (differential pressure) between the exhaust gas and compressed air passing through the venturi can be displayed through a pressure gauge, so that the compressed air and gas exhaust conditions can be monitored and controlled in real time. A mold exhaust device and a gas exhaust method using the same have been provided.

1 is an overall perspective view of an injection mold gas exhaust system having a local exhaust gas module according to the present invention;
2a is an exploded perspective view of a movable mold of an injection mold gas exhaust device having a local exhaust gas module according to the present invention;
2B is an exploded perspective view of a fixed mold of an injection mold gas exhaust device having a local exhaust gas module according to the present invention;
3 is a cutaway view of a main part of a fixed mold of an injection mold gas exhaust device having a local exhaust gas module according to the present invention;
4 is an excerpted perspective view of a local exhaust gas module of an injection mold gas exhaust device having a local exhaust gas module according to the present invention;
5 is a cross-sectional view showing the operating structure of the local exhaust gas module of the injection mold gas exhaust device having the local exhaust gas module according to the present invention;
6 is a cross-sectional view showing the operating structure of another embodiment of an injection mold gas exhaust device having a local exhaust gas module according to the present invention;
7 is a block diagram illustrating a gas exhaust method using an injection mold gas exhaust device having a local exhaust gas module according to the present invention;
8 is a schematic diagram explaining the Bernoulli principle of the injection mold gas exhaust system having a local exhaust gas module according to the present invention;
9 is a schematic diagram showing a conventional injection mold gas exhaust device.

Hereinafter, an embodiment of an injection mold gas exhaust device having a local exhaust gas module according to the present invention and a gas exhaust method using the same will be described with reference to the accompanying drawings.

The present invention is not limited or limited by the examples. In addition, in describing the present invention, detailed descriptions of well-known functions or configurations may be omitted to clarify the gist of the present invention.

Referring to FIG. 1 of the accompanying drawings, the present invention largely consists of an injection unit 1 and an exhaust unit 2. A pressure cylinder (general configuration, detailed illustration omitted) may be formed in the fixed mold 11 of the injection unit 1.

Referring to FIGS. 2A, 2B, and 3 of the accompanying drawings, the nipple 211 connected to the exhaust unit 2 is exposed in the movable mold 12 of the injection unit 1.

The nipple 211 forms an exhaust passage 122 to be connected to an exhaust line 21, which will be described later, formed inside the moving mold 12 of the injection unit 1. The exhaust passage 122 is formed with a vertical connection passage 123 to communicate with the cavity 121 .

When the fixed mold 11 and the moving mold 12 are combined, a cavity 121 is formed, the cavity 121 forms an exhaust passage 122, and a nipple 211 is formed at the end of the exhaust passage 122 . A molten resin, which is a molding material, may be injected into the cavity 121, and a detailed description of the injection part will be omitted.

In particular, since the cavity 121 has a depth of 0.03 mm, after combining the fixed and moving molds 11 and 12, the cavity 121 filled with molten resin forms a groove of 0.03 mm after combining the molds. The connection passage 123 may be connected vertically so as to communicate with the exhaust passage 122 on the side of the fixed mold 11 of the cavity 121 so that exhaust gas is smoothly discharged during molding.

When molten resin is injected through the injection part, the molten liquid is filled in the cavity 121 step by step, and the gas generated in the solidification process is connected to the nipple 211 of the exhaust line 21 connected to the exhaust passage 122.

Referring to the accompanying drawings FIGS. 4 , 5 , 6 and 8 , the exhaust unit 2 is configured around the venturi unit 22 .

In the venturi part 22, the high pressure inlet part 221 connected by the separate compressed air line 24 is connected through the inlet side connector 27 centered on the low pressure neck part 222 whose speed is increased according to the Bernoulli principle, An exhaust pipe 224 is connected at right angles to the lower side of the low pressure neck portion 222 so that exhaust gas is sucked into the low pressure neck portion 222 and discharged from the expansion portion 223 .

Therefore, the gas generated in the cavity 121 inside the injection part 1 flows through the exhaust pipe in proportion to the low pressure and high speed of the low pressure throat part 222, which is proportional to the pressure and speed of the compressed air supplied to the compressed air line 24. It is connected to be exhausted through section 224.

This follows the well-known Bernoulli's theorem. That is, the discharge part 23 of the venturi part 22 according to the accompanying drawing FIG. 5 is discharged from the expanded discharge part 223 side of the ventri part 22 as shown.

The discharge unit 23 preferably has a form in which the speed is increased in the narrowed low-pressure throat 222 to diffuse and disperse the exhaust gas of the expansion discharge unit 223 and diffuses in the expansion discharge unit 223, and at the same time filtering An air filtration filter may be mounted inside the casing so that the air filter is discharged after passing through the filter.

As shown in FIG. 6 of the accompanying drawings, the discharge unit 23 may have a structure for washing the filter. That is, the washing water supply unit 231 is formed on the upper portion of the casing (symbols omitted) forming the discharge unit 23. It is connected to the washing water injection nozzle 232 installed in the upper part of the casing, the filter 233 is formed at the end of the casing in the longitudinal direction, and the drain valve 234 is formed at the bottom of the casing.

Therefore, the foreign matter filtered by the filter 233 can be washed by spraying predetermined washing water through the washing water injection nozzle 232 .

Meanwhile, between the exhaust pipe 212 and the exhaust pipe 224, a pressure gauge 25 indicating a negative pressure (vacuum) state and a tar removal unit 26 may be installed therebetween.

Since the pressure gauge 25 indicates the vacuum pressure of the exhaust gas, it is possible to check it visually and control the compressed air at the same time. A detailed description of the pressure control process is omitted.

As will be described later, the pressure gauge 25 includes a first pressure gauge 251 displaying negative pressure (vacuum), a second pressure gauge 252 displaying excess pressure (positive pressure) at the inlet side of the venturi unit 22, and a venturi unit. It is possible to form a third pressure gauge 253 that displays the difference in pressure generated when the gas passes faster in (22), that is, the differential pressure.

The supply of the compressed gas can be controlled through the pressure condition of the venturi unit 22 . A detailed description of the pressure control situation will be omitted.

The tar removal unit 26 removes the tar contained in the exhaust gas passing between the exhaust line 212 and the exhaust pipe unit 224 of the venturi unit 22 into a heat sink 261 in which cooling fins are installed and the cooled tar It consists of a tar collection valve 262 to be collected in the lower tar collection container 263, and the bottom of the heat sink 261 is compressed air through the compressed air line by the cone 264 in the tar collection valve 262 As the injection is completed and the cone 264 is opened, the tar at the bottom of the heat sink 261 descends to the tar collection container 263 and is collected.

7 is a block diagram illustrating a gas exhaust method using an injection mold gas exhaust device having a local exhaust gas module according to the present invention. Referring to this drawing, a gas exhaust method using an injection mold gas exhaust field having a local exhaust gas module according to the present invention will be described.

The gas exhaust method using the injection mold gas exhaust device having the local exhaust gas module,

A resin molten material preparation step (S1) of plasticizing by adding a plasticizer to the molten material, a cylinder filling step (S2) of filling the prepared resin molten material into an injection machine cylinder, and filling the resin molten material into the cavity of the injection mold A cavity filling step (S3), a gate solidification step (S4) of solidifying the gate of the injection mold while maintaining a constant pressure in the melted resin material plasticized in the cavity of the injection mold, and melting the plasticized resin into the cavity of the injection mold A cooling step (S5) of solidifying the material and a take-out step (S6) of separating the injection mold and taking out the solidified product after the cooling is finished can be used as basic processes.

The pressure gauges 25 can check the negative pressure (vacuum) state as the first pressure gauge 251 and control the pressure of the compressed air in the compression line to a positive pressure through the second pressure gauge 252, and the third As the pressure gauge 253, it is possible to display the gas pressure (differential pressure) discharged and control the pressure gauge through this.

Specifically, the cylinder filling step (S2) may have a positive pressure control step (S21) of supplying and controlling the overpressure for a predetermined time while checking the pressure through the second pressure gauge 252. The molten resin is injected through the injection cylinder installed in the injection unit 1 and the fixed mold 11, and at the same time, the injection pressure is charged into the cylinder while visually confirming that the pressure becomes a positive pressure greater than the atmospheric pressure using the second pressure gauge 252.

After the cylinder injection step, the cavity filling step (S3) checks and controls the negative pressure state through the first pressure gauge 251 while controlling the injection pressure to be negative pressure (vacuum) through the first pressure gauge 251, At the same time, a gas exhausting step (S32) for exhausting gas in a negative pressure state may be included.

That is, when the gas in a positive pressure state through the compressed air line 24 is supplied to the high pressure input unit 221 of the venturi unit 22, the gas is in an exhaust state along the exhaust line 21 of the exhaust unit 2, and at this time The first pressure gauge 251 displays a negative pressure state and at the same time has an upward force and is exhausted to the lower exhaust pipe part 224 of the venturi part 22 . Of course, at this time, the gas exhaust step (S32) may further have a tar removal step (S321) and a filter cleaning step (S322).

That is, in the tar removal step (S321), as described above, the tar contained in the exhaust gas of the exhaust line 212 is cooled as a heat sink 261 equipped with a cooling fin, and the cooled tar is lowered to the tar collecting container 263 ) is captured in When the cone 264 of the tar collection valve 262 connected to the bottom of the heat sink 261 is opened, the tar accumulated on the bottom of the heat sink 261 falls to the tar collection container 263 and is collected.

At the same time, the exhaust gas passing through the tar collection container 26 is discharged through the exhaust pipe part 224 and the low pressure neck part 222 to the expanded discharge part 223.

At this time, in the filter washing step (S322), the supplied washing water is used as the washing water spray nozzle 232 to wash foreign substances accumulated on the filter 233 and send it to the bottom side, and after washing including the foreign substances accumulated on the floor, the washing water is drained through the drain valve ( 234) to drain. Therefore, the exhaust gas from which foreign substances, tar, etc. included in the exhaust gas are removed is discharged from the discharge unit 23 to the uncontaminated exhaust gas.

On the other hand, in the gate solidification step (S5), the gate is solidified while controlling the pressure of the pressure gauge 25 to maintain the pressure of the pressure gauge 25 at a constant pressure (same pressure as atmospheric pressure, holding pressure).

In the cooling step (S4), the molten resin in the cavity is solidified through a step of cooling the fixed mold 11 and the movable mold 12 coupled to the injection unit 1 in a blocked state as a solidified gate after the injection of the molten resin is completed. let it

Thereafter, the fixed mold 11 and the moving mold 12 of the injection unit 1 are separated to take out the resin material of the solidified molten resin.

As described above, in the injection mold gas exhaust device having a local exhaust gas module and a gas exhaust method using the same according to a preferred embodiment of the present invention, a high pressure input unit connected to a compressed air line and compressed air passing through the high pressure input unit form a low pressure at a high speed. By constructing a venturi part composed of a low-pressure neck portion formed with a narrow neck portion to pass through, an exhaust pipe portion connected to exhaust gas from the exhaust line at the lower side of the low-pressure neck portion, and an expanded discharge portion that sucks and discharges the exhaust gas from the low-pressure neck portion, Bernoulli By arrangement, the gas generated during injection molding is discharged, and as an injection mold gas exhaust device having such a local exhaust gas module and a gas exhaust method using the same, deformation, weld line, shrinkage, and parting that occurred in conventional resin injection molding products It improves quality by improving line burr generation, reducing injection density deviation to improve warpage and strength, shortening injection time to improve productivity, and easy cooling to improve release.

An injection mold gas exhaust device having a local exhaust gas module and a gas exhaust method using the same of the present invention improve problems (exhaust of unnecessary residual gas that causes defects in injection production) due to existence without being able to escape from the molding space in the injection mold The suction structure for discharging is easily implemented in the injection mold.

The injection mold gas exhaust device having a local exhaust gas module and the gas exhaust method using the same according to the present invention can check the pressure (negative pressure) of the injection mold exhaust process through a pressure gauge, so that the pressure of the compressed air can be controlled, thereby providing smooth Injection molding pressure line can be realized.

An injection mold gas exhaust device having a local exhaust gas module and a gas exhaust method using the same according to the present invention can check the pressure (negative pressure) of the injection mold exhaust process through a pressure gauge, and can control the pressure of compressed air to a positive pressure. Therefore, it is possible to implement a stable pressure gauge for injection molding. In particular, the pressure difference (differential pressure) between the exhaust gas and compressed air passing through the venturi can be displayed through a pressure gauge, so that the compressed air and gas exhaust conditions can be monitored and controlled in real time. A mold gas exhaust device and a gas exhaust method using the same have been provided.

As described above, the preferred embodiments of the present invention have been described with reference to the drawings, but those skilled in the art can make various modifications to the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. may be modified or changed.

1: injection part 2: gas exhaust part 11: fixed mold
12: moving mold 121: cavity (molding groove) 122: exhaust passage
123: connection passage 21: exhaust line 211: nipple 212: exhaust pipe 22: ventri part
221: high pressure inlet 222: low pressure neck 223: expansion discharge
224: exhaust pipe part 23: discharge part 231: washing water supply part
232: washing water injection nozzle 233: filtration filter 234: drain valve
24: compressed air line 25: pressure gauge 251, 252, 253: first, second, third pressure gauge
26: tar removal unit 261: heat sink 262: tar collection valve
263: tar collection container 264: cone 27: connector

Claims (6)

It consists of a movable mold 12 and a stationary mold 11 forming a molding space 121, and is provided with a pressure cylinder for injecting molten resin, which is a molding material, into the molding space 121, and inside the fixed mold 12 Injection molding having an exhaust passage 122 connected to the molding space 121 to exhaust gas and a connection passage 123 perpendicular thereto, and having a nipple 21 formed at the distal end of the exhaust passage 122. Part (1); and
An exhaust line 21 is formed from the nipple 21, and a compressed air line 24 is formed separately from the exhaust line 21, and a high pressure input unit with an expanded diameter is provided to the compressed air line 24 side ( 221) is connected, and the exhaust pipe part 224 is connected to the exhaust line 21 side, and the high pressure input part 221 is extended to form a low pressure neck part 222 with a narrowed pipe diameter, and the low pressure neck part 222 is extended to the other side. A discharge part 223 is formed, and a venturi part 22 forming an exhaust pipe part 224 to which the exhaust line is connected is connected to the lower side of the low pressure neck part 222, and is connected to the expanded discharge part 223 to filter A discharge unit 23 for filtering exhaust air as a filter 233, and a tar removal unit 26 installed to remove tar contained in exhaust gas between the exhaust pipe unit 224 and the exhaust line 21 And, the exhaust gas module 2 consisting of a pressure gauge 25 for displaying the pressure of the exhaust gas in the exhaust line 21;
Injection mold gas exhaust device having a local exhaust gas module comprising a. The method of claim 1, wherein the tar removal unit 23 of the exhaust gas module 2,
A heat sink 261 installed by forming a cooling fin between the exhaust line 21 and the exhaust pipe part 224 of the venturi part 22;
A tar collection container 263 installed below the heat sink 262 to collect the cooled tar; and
a tar collection valve 262 forming an opening/closing cone 264 installed to open and close the inlet of the tar collection container 263 at the bottom of the heat sink 262;
Injection mold gas exhaust device having a local exhaust gas module comprising a. The method of claim 1, wherein the pressure gauge 25 of the exhaust gas module 2,
a first pressure gauge 251 displaying the negative pressure on the exhaust line 21;
a second pressure gauge displaying the pressure through which compressed air pressure (positive pressure) passes; and
a third pressure gauge displaying a discharge pressure (differential pressure) of the venturi unit;
Including, checking the pressure level (positive pressure) of the compressed air, the negative pressure (vacuum pressure) of the exhaust line, and the pressure (differential pressure) of the discharge unit 23, and controlling whether or not the pressure of the compressed air increases An injection mold gas exhaust device having a local exhaust gas module to According to claim 1, The discharge part 23 of the exhaust gas module (2),
a filtration filter 233 mounted in a casing forming the discharge portion 23;
a washing water supply unit 231 installed above the casing;
A washing water spray nozzle 232 connected to the washing water supply unit in the casing to spray washing water; and
a drain valve 234 installed on the bottom of the casing to drain foreign substances separated from the filtration filter 233;
Injection mold gas exhaust device having a local exhaust gas module comprising a. In the gas exhaust method using the injection mold gas exhaust device having the local exhaust gas module according to claims 1 to 4,
A molten resin preparation step (S1) of adding a plasticizer to the molten resin to plasticize it;
A cylinder filling step (S2) of filling the prepared molten resin into an injection molding machine cylinder;
A cavity filling step (S3) of pressurizing and injecting molten resin into the cavity of the injection mold;
A gate solidification step (S4) of solidifying the gate of the injection mold while maintaining a constant pressure of the plasticized molten resin in the cavity of the injection mold;
A cooling step (S5) of solidifying the plasticized molten resin in the cavity of the injection mold; and
After the cooling is complete, an ejection step (S6) of separating the injection mold and taking out the solidified product;
including,
In the cylinder filling step (S2),
A pressure control step (S21) of controlling the pressure to a normal pressure (positive pressure) for a predetermined time while checking the pressure through a pressure gauge;
including,
In the cavity filling step (S3),
A negative pressure control step (S31) in which the pressure is controlled through a pressure gauge to be in a vacuum pressure (negative pressure) state; and
A gas exhaust step (S32) of exhausting gas in a negative pressure state;
including,
The gas exhaust step (S32),
A tar removal step (S321) of cooling the tar contained in the exhaust gas of the exhaust line 212 as a heat sink 261 equipped with cooling fins and collecting the cooled tar in the lower tar collecting container 263;
A gas exhaust method using a gas exhaust device of a local injection mold having a local exhaust gas module comprising a. The method of claim 5, wherein the gas exhaust step (S32),
A filter washing step (S322) of washing the foreign substances accumulated on the filter 233 as the washing water spray nozzle 232 and draining them through the bottom drain valve 234;
A gas exhaust method using a gas exhaust device of a local injection mold having a local exhaust gas module comprising a.

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