KR101918931B1 - Cooling nozzle for liquid silicon rubber injection mould - Google Patents

Abstract

A liquid silicone rubber injection mold that can directly cool the injection nozzle to prevent the resin from hardening during the contact between the high temperature cavity and the cold runner and to shorten the molding time of the molding product by reducing the time consumed in the cooling cycle of the injection cycle A cooling nozzle is disclosed. A protective cover provided so as to surround the nozzle tube portion so that the refrigerant does not escape from the linear cooling channel; and a nozzle plate coupled to a rear end of the nozzle tube portion, the nozzle tube portion having a linear cooling passage for moving the refrigerant in the linear direction, And a contact tip for discharging the liquid silicone rubber which has passed through the tube portion. According to the present invention, since the circulation speed of the refrigerant passing through the cooling nozzle can be maximized, the temperature of the cooling nozzle can be maintained at a constant temperature close to the temperature of the refrigerant, the contact tip can be separated, Materials and the like can be removed easily and quickly.

Description

Technical Field [0001] The present invention relates to a cooling nozzle for a liquid silicone rubber injection mold,

The present invention relates to a cooling nozzle for a liquid silicone rubber injection mold used for molding an injection molded article by supplying a liquid silicone rubber to a cavity of a mold, and more particularly to a cooling nozzle for a liquid silicone rubber injection mold, And the temperature of the mold is maintained at a high temperature so as to shorten the time consumed in the curing cycle in the injection cycle to shorten the molding time of the molded product and the liquid silicone rubber injection capable of directly cooling the injection nozzle to enable continuous injection And a cooling nozzle for a mold.

In general, a liquid silicone rubber injection mold nozzle feeds a resin liquefied in an injection machine to a cavity of a mold through a gate of a nozzle to form an injection molding. That is, in the conventional nozzle, a cooling structure is provided on the outside of the nozzle body made of metal, and the nozzle body is cooled while the thermocouple of the injector cooling device is used to measure and control the temperature, So that the injection was made.

However, since the conventional method can not rapidly cool the temperature of the gate which is the end portion of the nozzle, when the molding is completed and the product is taken out, the resin continuously flows out from the gate, There is a disadvantage that the resin is elongated and forms a COLD SLUG, which has a problem that it hinders the next cycle molding.

In order to solve this problem, a valve gate nozzle (NOVZLE) for a liquid silicone rubber injection mold and an open nozzle (NOZZLE) have been conventionally invented.

However, in the case of the valve gate nozzle, the valve pin has a large problem that the basic structure is wrapped by the liquid resin, and the resin generates heat energy while passing around the valve pin at a high speed, In the past, there has been no way to cool this quickly and properly.

That is, since the valve pin heated to a high temperature is in contact with the solidified molded product, the temperature difference between the resin injected into the mold first and the resin portion contacting the high temperature gate is severely generated, Since the curing rate is different, the nose is formed on the gate part of the molded product, the clogging of the gate, and the rugged formation of the gate cause the appearance to be not good or the continuous production can not be performed, There is a problem that the product must be disposed of in a defective manner and discarded.

In the case of the open nozzle, the end portion of the nozzle is always open so that the liquid resin flows, and the gate can be hardened according to the passage of time. However, in adjusting the cooling rate, Problems such as occurrence of star deviation, occurrence of nose, clogging of gates, uneven molding, and problems in that productivity is deteriorated due to a long cooling time.

Particularly, in injection molding using liquid silicone rubber (LSR), when the cavity and the cold cold runner nozzle come into contact with each other, the phenomenon that the hardening of the resin occurs irregularly due to the rapid heat transfer from the hot mold to the gate portion is frequently There is a problem that the quality of the molded product is deteriorated.

In addition, as a cooling medium used in a cooling cycle in injection molding using liquid silicone rubber, a refrigerant is mainly used. Since a contact portion in direct contact with a hot metal mold is integrally formed with a nozzle and a contact portion, The cooling efficiency of the mold contacting portion of the cold runner nozzle is significantly lowered and irregularities are caused.

That is, in the case where the cooling of the contact portion is to be performed, it is difficult to form the circulation conduit through which the refrigerant circulates to the contact end portion in the case where the cooling medium is used as the refrigerant. There was a problem that was impossible in itself.

Further, even in the case of relatively large cooling nozzles, when cooling is performed with the refrigerant to cool the contact portion, there is a problem that precise airtightness must be performed in order to prevent leakage of water due to the nature of the fluid.

Accordingly, recently, a cooling system provided with nozzles of a liquid silicone resin injection mold having a helical structure as shown in Fig. 1 was invented.

The cooling system is connected to the nozzle 10 configured in the injection molding machine and is configured to supply and recover the refrigerant to cool the housing 12 of the nozzle 10, The compressed air for direct cooling of the compressor 20 is supplied and recovered. Here, the nozzle 10 is a component for supplying a liquid silicone resin (LSR) to the gate portion, and a spiral coolant path 14 is formed on the outer peripheral surface of the housing 12 of the nozzle 10.

However, the cooling system described above has a problem in that it is difficult to keep the temperature of the cooling nozzle constant at a temperature close to the temperature of the refrigerant because the supply of the refrigerant is performed through the spiral structure.

Korean Registered Patent No. 10-1405051 (published on June 10, 2014) Korean Patent Publication No. 10-2010-0131399 (published on Dec. 15, 2010) Korean Patent Publication No. 10-2010-0028978 (published on Mar. 15, 2010)

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a cooling nozzle for a liquid silicone rubber injection mold capable of increasing the circulation speed of a coolant by providing a cooling channel of a coolant provided on the surface of a cooling nozzle in a straight line, .

According to an aspect of the present invention, there is provided an apparatus for cooling a refrigerant, comprising: a nozzle tube portion having a linear cooling channel for moving a refrigerant in a linear direction; And a contact tip which is coupled to a rear end of the nozzle tube portion and discharges the liquid silicone rubber which has passed through the nozzle tube portion. The present invention also provides a cooling nozzle for a liquid silicone rubber injection mold.

According to the present invention, since the circulation speed of the refrigerant passing through the cooling nozzle can be maximized, the temperature of the cooling nozzle can be maintained at a constant and stable temperature close to the temperature of the refrigerant.

In addition, since the cooling nozzle according to the present invention has an outer diameter of less than 20 mm, it is not easy to secure a large space of the cooling channel. Therefore, by adopting a linear reciprocating structure, it provides direct superior cooling efficiency.

 In addition, the present invention is characterized in that the liquid silicone rubber in the nozzle of the liquid silicone rubber injection mold which is in contact with the hot mold is rapidly cooled and stably maintained, so that sprue, burrs and partial hardening of the contact end It is possible to prevent the generation of byproducts generated due to the increase in the productivity per unit time.

1 is a cross-sectional view showing a nozzle for an injection mold of a conventional liquid silicone rubber.
2 is an exploded perspective view for explaining a cooling nozzle for an injection mold of a liquid silicone rubber according to the present invention.
3 is a partial transmission front view showing a cooling nozzle for an injection mold of a liquid silicone rubber according to the present invention.
4 is a front view showing a nozzle tube portion according to the present invention.
5 is a partial transmission side view showing a cooling nozzle for an injection mold of a liquid silicone rubber according to the present invention.
6 is a side view showing a nozzle tube according to the present invention.
7 is a structural view showing a gate cooling structure of a liquid silicone resin injection mold according to the present invention.
8 is a configuration diagram for explaining experimental conditions of Experimental Example 1. Fig.
FIG. 9 is a configuration diagram for explaining experimental conditions of Experimental Example 2. FIG.

Hereinafter, a cooling nozzle for a liquid silicone rubber injection mold according to preferred embodiments of the present invention (hereinafter, referred to as 'LSR cooling nozzle') will be described in detail with reference to the accompanying drawings.

FIG. 2 is an exploded perspective view illustrating a cooling nozzle for an injection mold of a liquid silicone rubber according to the present invention, FIG. 3 is a partial transmission front view showing a cooling nozzle for an injection mold of a liquid silicone rubber according to the present invention, And Fig.

2 to 4, the LSR cooling nozzle according to the present invention includes a nozzle tube portion 100 for moving and discharging the liquid resin introduced from the outside, and a nozzle tube portion 100 provided outside the nozzle tube portion 100 And a contact tip 300 coupled to a rear end of the nozzle tube portion 100. [

Since the end of the LSR cooling nozzle is in contact with the surface of the injection mold of the hot liquid silicone rubber, the cooling efficiency of the LSR cooling nozzle is very important for delaying the curing of the liquid silicone rubber by the mold heat.

In particular, the cooling efficiency of the LSR cooling nozzle can be divided into high and low efficiencies depending on how smoothly the refrigerant passes through the cooling flow path. This is due to the characteristics of the LSR cooling nozzle which is in direct contact with the injection mold of the liquid silicone rubber reaching 170 ~ 200 ° C, assuming the temperature of the refrigerant is about 25 ° C. As the circulation speed of the refrigerant becomes faster, It is possible to maintain the temperature close to the temperature and stable.

In addition, it is important that the LSR cooling nozzle, which is in direct contact with the injection mold of the liquid silicone rubber reaching 170 to 200 ° C, is maintained at a constant temperature capable of delaying the curing of the LSR by circulation of the refrigerant. However, since LSR cooling nozzles with an outer diameter of less than 20 mm are not easy to secure a sufficient space for the cooling flow path, the design of the cooling path for rapid cooling directly affects the cooling efficiency.

Hereinafter, each component will be described in more detail with reference to the drawings.

Referring to FIGS. 2 to 4, the LSR cooling nozzle according to the present invention includes a nozzle tube portion 100.

The nozzle tube portion 100 includes a nozzle body 110 and guide protrusions 122, 124, 126 and 128. The nozzle body portion 100 has a linear cooling flow path for moving the refrigerant in a linear direction. The nozzle tube portion 100 may be made of stainless steel but may be made of any material having a thermal conductivity capable of maintaining the temperature inside thereof at a predetermined temperature without contaminating the supplied liquid silicone resin Do.

The nozzle body 110 has a tubular structure in which a liquid silicone resin passes through the nozzle body 110 and a refrigerant passes through the nozzle body 110 to maintain the supply temperature of the liquid silicone resin at a constant level.

If necessary, the nozzle body 110 may be provided with a seating protrusion so that the contact tip 300 inserted through the outlet can be seated on the inner peripheral surface of the rear end where the liquid silicone resin is injected.

The guide protrusions 122, 124, 126 and 128 protrude from the surface of the nozzle body 110 to move the refrigerant supplied to the tip of the nozzle body 110 to the rear end of the nozzle body 110, And moves the refrigerant to the tip of the nozzle body 110. [

FIG. 5 is a partial transmission side view showing a cooling nozzle for an injection mold of liquid silicone rubber according to the present invention, and FIG. 6 is a side view showing a nozzle tube according to the present invention.

2 to 6, the guide protrusion according to the present invention includes a first guide protrusion and a second guide protrusion for dispersing the refrigerant introduced from the outside in two directions and moving along the outer circumferential surface of the nozzle tube portion 100, 4 guide protrusions 122, 124, 126,

3, the first guide protrusion 122 is formed to be spaced apart from the tip of the nozzle body 110 to provide a space for accommodating refrigerant supplied to the tip of the nozzle body 110, The other end portion of the nozzle body 110 facing the distal end portion is formed up to the distal end of the nozzle body 110 and an intermediate portion connecting the distal end portion and the other end portion is formed. Accordingly, a part of the refrigerant introduced from the outside through the protective cover 200 moves to the right side of the first guide protrusion 122, and the remaining refrigerant moves to the left side of the first guide protrusion 122.

The second guide protrusion 124 is formed to be spaced apart from the surface of the nozzle body 110 in the right direction of the first guide protrusion 122 so as to be positioned between the first guide protrusion 122 and the second guide protrusion 124 The first linear flow path 102 having a linear structure along the longitudinal direction of the nozzle portion is formed. At this time, the first straight line 102 provides a path for the refrigerant to move to the right side of the first guide protrusion 122.

Specifically, the second guide protrusion 124 is formed such that the tip end thereof is formed at the tip of the nozzle body 110, and the other end opposite to the tip end portion is spaced from the end of the nozzle body 110, And an intermediate portion connecting the other ends in a straight line is formed. The second guide protrusion 124 is provided so as to be spaced apart from the end of the nozzle body 110 at the other end thereof and is connected to a connecting flow path 106 for connecting the first rectilinear flow path 102 to a second rectilinear flow path 104 ).

The third guide protrusion 126 is spaced apart from the surface of the nozzle body 110 in the left direction of the first guide protrusion 122 so as to be separated from the first guide protrusion 122 and the third guide protrusion 126 A third linear flow passage having a linear structure is formed along the longitudinal direction of the nozzle portion. At this time, the third linear flow path provides a path for the refrigerant to move to the left side of the first guide protrusion 122.

Specifically, the third guide protrusion 126 is formed in the same structure as the second guide protrusion 124 in the direction opposite to the second guide protrusion 124 with respect to the center axis of the nozzle tube portion 100. At this time, the third guide projection 126 is provided so that the other end thereof is spaced from the end of the nozzle body 110, thereby forming a connection flow path connecting the third straight flow path and the fourth straight path described later.

The fourth guide protrusion 128 is formed on the surface of the nozzle body 110 so as to be spaced apart from the surface of the second guide protrusion 124 in the right direction and is disposed between the second guide protrusion 124 and the fourth guide protrusion 128 And a second linear flow path (104) having a linear structure along the longitudinal direction of the nozzle portion is formed. At this time, the second straight line flow path 104 moves to the right side of the first guide protrusion 122 and moves to the rear end of the nozzle body 110, so that the refrigerant can move back to the tip of the nozzle body 110 to provide.

The fourth guide protrusion 128 is formed to be spaced apart from the third guide protrusion 126 in the left direction and is disposed between the third guide protrusion 126 and the fourth guide protrusion 128 along a longitudinal direction of the nozzle portion. Is formed. At this time, the fourth rectilinear flow path provides a path through which the refrigerant that has entered the left side of the first guide protrusion 122 and moved to the rear end of the nozzle body 110 can move back to the tip of the nozzle body 110.

The fourth guide protrusion 128 has the same structure as the first guide protrusion 122 in the direction opposite to the first guide protrusion 122 with respect to the center axis of the nozzle tube portion 100.

6, the linear cooling channel formed in the nozzle unit of the present invention includes a first linear channel 102 formed in a linear structure along the longitudinal direction of the nozzle tube unit 100, A second straight line flow path 104 formed in a linear structure along the longitudinal direction of the nozzle tube portion 100 and a second straight line flow path 104 formed between the end of the first straight line flow path 102 and the second straight flow path 104, And a connection channel 106 connecting the front ends of the connection channels 106.

If the temperature of the nozzle tube portion 100 is kept constant at about 25 占 폚 or the like, the nozzle tube portion 100 is maintained at a constant temperature while flowing along the longitudinal direction, Can be made uniform. For example, even when the external temperature is 170 to 200 ° C, the liquid silicone rubber passing through the nozzle tube portion 100 can maintain a temperature equal to or similar to the temperature of the refrigerant.

Referring to FIGS. 2 and 3, the LSR cooling nozzle according to the present invention includes a protective cover 200.

The protective cover 200 is formed to surround the nozzle tube portion 100 so that the refrigerant does not escape from the linear cooling channel of the nozzle tube portion 100 and has an outer shape corresponding to the outer shape of the nozzle tube portion 100. For example, when the nozzle tube portion 100 is formed to have a tubular structure, the protective cover 200 is formed to have a tubular structure corresponding to the nozzle tube portion 100. When the nozzle tube portion 100 is formed to have a rectangular columnar structure, (200) are also formed to have a square columnar structure.

The protective cover 200 is provided with a first through hole 210 through which refrigerant flows into the front end of the protective cover 200. The protective cover 200 has a through hole 210, And a second through hole through which the refrigerant is discharged. At this time, the first through-hole 210 is provided with a supply port for supplying the refrigerant, and the second through-hole may be provided with a discharge port for discharging the refrigerant.

The protective cover 200 together with the guide protrusions formed on the nozzle tube portion 100 forms a plurality of linear cooling passages through which the refrigerant can be moved. In other words, the protective cover 200 according to the present invention is formed such that a guide protrusion protruding from the surface of the nozzle body 110 has a thickness that can be brought into close contact with the inner circumferential surface of the protective cover 200.

Such a protective cover 200 may be made of stainless steel, but any material may be used as long as it can maintain the internal cooling temperature without contaminating the supplied refrigerant.

Referring to FIGS. 2 and 3, the LSR cooling nozzle according to the present invention may further include a contact tip 300.

The contact tip 300 is coupled to the rear end of the nozzle tube portion 100 so that the liquid silicone rubber that has passed through the nozzle tube portion 100 can be discharged. The liquid silicone resin that has passed through the nozzle tube portion 100 is discharged Shaped structure having a pointed end so as to have a sharp end.

The contact tip 300 is formed separately from the nozzle tube 100, for example, the nozzle body 110, and is fitted to the outlet of the nozzle body 110. At this time, the contact tip 300 is seated on the mounting projection provided in the nozzle body 110, so that only one end is inserted into the nozzle body 110. The contact tip 300 is formed to have an outer diameter corresponding to the inner diameter of the outlet of the nozzle body 110 so as to be stably fitted into the nozzle body 110. [

In addition, the present invention is constructed by applying a different material such as a copper alloy having a higher thermal conductivity than the material of the nozzle tube portion 100 only to the contact tip 300, which is a very small portion in contact with the metal mold in the cooling nozzle. Specifically, the contact tip 300 can be composed of a metallic material having a thermal conductivity of 397 W / mK to 450 W / mK and a strength in the range of 650 to 1000 N / mm < 2 >.

As described above, the unique application characteristic of the cooling nozzle used in the LSR injection mold is advantageous in that the higher the thermal conductivity is, the more the temperature can be maintained to maintain the LSR hardening. Therefore, the present invention is applicable to a nozzle having a different thermal conductivity So that the formed contact tip 300 can be assembled to the nozzle tube portion 100.

In addition, the contact tip 300, which is detachably connected to the nozzle tube 100, has a contact tip 300 when the mold is cleaned after a product manufacturing operation, considering that the contact tip 300 is only about 2 mm in length. Is completely separated from the nozzle tube portion 100 and can be cleaned.

7 is a structural view showing a gate cooling structure of a liquid silicone resin injection mold according to the present invention.

Referring to FIG. 7, the gate cooling structure is a cooling system for directly cooling the cooling nozzle for injection molding so as to prevent nose pilling or rugged formation on the contact tip portion, and supplies air compressed by the evaporator 430 A coolant circulation line 500 in which the coolant generated through the evaporator 430 is supplied and circulated, and a coolant circulation line 500 through which the coolant is received, And a control unit 502 for controlling the display unit.

The air line 400 includes an air inflow line 402 for supplying compressed air from the compressed air supply unit to the evaporator, an air inflow line 402 for discharging the low temperature compressed air, which is a cooling medium produced by the evaporator 430, Line 404 as shown in FIG.

A water eliminator 410 for removing moisture and oil contained in the compressed air when the compressed air flows into the air inflow line 402, and various foreign substances contained in the compressed air, which are connected to the water remover 410, A filter regulator 420 for regulating the air pressure, and an evaporator 430 for exchanging heat with air while the low-pressure refrigerant evaporates.

A supply control valve 440 is provided in the air discharge line 404 to control the supply amount of the compressed air at a low temperature produced by the evaporator 430. When the compressed air is discharged from the evaporator 430, And a temperature sensing unit 450 for measuring the temperature of the compressed air.

The refrigerant circulation line 500 includes a compressor 520 for compressing the refrigerant supplied from the evaporator 430 to generate high temperature and high pressure refrigerant gas, an oil separator 530 for separating the compressor oil from the high temperature and high pressure refrigerant gas, A liquid separator 550 for separating only pure liquid refrigerant from the condensed refrigerant, a low-pressure low-pressure refrigerant of high temperature and high pressure, And an expansion valve 560 for supplying the refrigerant to the compressor 430.

At this time, a liquid separator 510 may be installed between the compressor 520 and the evaporator 430. The liquid separator 510 separates the liquid refrigerant discharged from the evaporator 430 so that only the pure gas refrigerant is discharged to the compressor 520.

A filter dryer 470 is provided between the liquid separator 550 and the evaporator 430 to remove foreign substances contained in the condensed refrigerant and to supply purified condensed refrigerant only. A control valve 590 for controlling the supply of condensed refrigerant stored in the liquid separator 550 to the evaporator 430 and controlling the flow rate of the condensed refrigerant flowing into the evaporator 430, The expansion valve 560 is configured to lower the high-pressure liquid refrigerant located in the liquid pipe connecting the separator 550 and the evaporator 430 to a saturation pressure corresponding to the required low temperature.

The cooling system according to the present invention is configured to be connected to a cooling nozzle provided in an injection mold to supply and recover refrigerant to cool the nozzle body 110 of the cooling nozzle, The compressed air for direct cooling of the compressor 300 is supplied and recovered.

Hereinafter, specific examples and experimental examples of the present invention will be described in more detail. It should be understood, however, that the embodiments and examples are for the purpose of promoting understanding of the specific examples of the invention described above, and the scope of rights and the like should not be construed thereby.

[Example 1]

And the LSR cooling nozzles of the present invention in which the first guide protrusion to the fourth guide protrusion are provided on the surface of the nozzle tube portion at regular intervals are used.

[Example 2]

An LSR cooling nozzle including a nozzle tube portion formed of stainless steel and having a first guide protrusion through a fourth guide protrusion at regular intervals and a contact tip formed of a copper alloy and fitted into the outlet of the nozzle tube portion was used .

[Comparative Example 1]

Among the conventional cooling nozzles, a cooling nozzle (LSR cold nozzle, ELMET, Germany) having a helical structure as shown in Fig. 1 was used.

[Comparative Example 2]

An LSR cooling nozzle including a nozzle tube portion formed of stainless steel and provided with a first guide protrusion through a fourth guide protrusion at regular intervals and a contact tip formed integrally with the nozzle tube portion was used.

[Experimental Example 1]

The cooling nozzles of Example 1 and the cooling nozzles of Comparative Example 1 were implemented with circulating discharge structures under the same conditions as those of the same capacity of cooling water of the same capacity, and the cooling water discharge times of the same capacity were measured and compared 30 times, respectively. At this time, experimental conditions were set as shown in FIG. 8, and the results of the completion time of the cooling water discharge are shown in [Table 1] below.

Referring to [Table 1], it was observed that the conventional cooling nozzle took longer time to discharge the cooling water than the cooling nozzle of the present invention by about 78% (about 1.78 times).

[Experimental Example 2]

When the cooling nozzle of Example 2 and the cooling nozzle of Comparative Example 2 were brought into contact with the LSR injection mold of the same temperature and the same amount of cooling water was circulated for the same time at the same pressure, the temperature of the contact tip was measured 30 times Respectively. At this time, experimental conditions were set as shown in FIG. 9, and the results of the temperature measurement of the contact tip are shown in Table 2 below.

Referring to [Table 2], it was observed that the cooling nozzle of Comparative Example 2 had an average temperature of the backside of the contact tip of about 26.6 ° C (about 25%) higher than the cooling nozzle of Example 2.

As a result, the cooling nozzle of the second embodiment has a higher thermal conductivity than the cooling nozzle of the second comparative example, so that the cooling effect of the cooling water is quickly transmitted to the contact tip, and the temperature of the contact tip is rapidly decreased.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. It can be understood that it is possible.

100: nozzle tube part 110: nozzle body
122: first guide projection 124: second guide projection
126: third guide projection 128: fourth guide projection
200: protective cover 210: first through hole
300: Contact tip

Claims (6)

A protective cover installed to surround the nozzle tube portion so that the coolant does not escape from the linear cooling channel; and a nozzle tube portion coupled to the rear end of the nozzle tube portion, And a contact tip for discharging the passed liquid silicone rubber,
Wherein the linear cooling flow path includes a first rectilinear flow path formed in a linear structure along a longitudinal direction of the nozzle tube portion, a second rectilinear flow path formed to be spaced apart from the first rectilinear flow path, And a connection channel connecting the distal end of the first rectilinear flow passage and the distal end of the second rectilinear flow passage,
Wherein the contact tip is formed of a metallic material having a thermal conductivity higher than that of the material of the nozzle tube part, and is formed of a metal material separated from the nozzle tube part and fitted to an outlet of the nozzle tube part. delete The ink cartridge according to claim 1, wherein the nozzle tube portion
A nozzle body through which a liquid silicone resin is passed and a refrigerant is passed through to the outside to maintain a supply temperature of the liquid silicone resin constant; And
And a guide protrusion protruded from the surface of the nozzle body to move the refrigerant supplied to the tip of the nozzle body to the rear end of the nozzle body and to move the refrigerant moved to the rear end to the tip of the nozzle body, Liquid silicone rubber Cooling nozzle for injection mold. 4. The apparatus of claim 3, wherein the guide protrusion
And a distal end portion of the nozzle body is formed to be spaced apart from a tip end of the nozzle body so as to provide a space for accommodating the refrigerant supplied to the tip of the nozzle body and the other end is formed up to the end of the nozzle body, A first guide protrusion formed;
A second guide protrusion formed to be spaced apart from the first guide protrusion and having a distal end formed at a distal end of the nozzle body and a second distal end spaced from a distal end of the nozzle body and having an intermediate portion for linearly connecting the distal end and the other end, Guide projections;
A third guide protrusion formed in the same direction as the second guide protrusion in the direction opposite to the second guide protrusion with respect to the central axis of the nozzle tube portion; And
And a fourth guide protrusion formed in the same direction as the first guide protrusion in the direction opposite to the first guide protrusion with respect to the central axis of the nozzle tube portion. 4. The apparatus of claim 3, wherein the nozzle body
Wherein a seating protrusion is provided on an inner circumferential surface of a rear end where the liquid silicone resin is injected so that a contact tip inserted through a discharge port can be seated on the inner surface of the rear end of the liquid silicone rubber resin injection nozzle. 2. The method of claim 1,
Wherein the cooling nozzle is formed of a metal material having a thermal conductivity of 397 to 450 W / mK and a strength in the range of 650 to 1000 N / mm < 2 >.

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