KR102367983B1 - Hot runner system with tip heater - Google Patents

Abstract

The present invention relates to a hot runner system with a tip heater and comprises: a nozzle body connected to a manifold and having a first flow path for supplying molten resin; a body heater provided around the nozzle body to heat the nozzle body so as to maintain the molten state of the molten resin flowing along the first flow path; a nozzle tip provided at an end of the nozzle body and having a second flow path to inject the molten resin supplied along the first flow path to a gate; and a tip heater provided around the nozzle tip to heat the nozzle tip so as to maintain the molten state of the molten resin injected into the gate along the second flow path of the nozzle tip. The hot runner system with a tip heater can control the temperature of the tip of the nozzle individually, improve the tip durability by changing the material, meet the insufficient temperature due to core cooling, solve stringing, and improve the quality and productivity of molded products.

Description

Hot runner system with tip heater {Hot runner system with tip heater}

The present invention relates to a hot runner system equipped with a tip heater, and more specifically, it is possible to individually control the temperature of the tip of the nozzle, and to solve the problem of durability deterioration when applying a conventional copper-based alloy through the application of a metal alloy material. It can improve tip durability and gate problems (Gate String, Gate Sealing, Gate Mark, Gate Trouble) through temperature control. And it relates to a hot runner system provided with a tip heater that improves productivity.

Hot runner system refers to a device for injecting molten resin (hereinafter 'molten resin') into the cavity of the mold while maintaining the temperature of the molten resin at a high temperature and injecting it into the mold at high pressure. it is common to do

Such a hot runner system, for example, during injection molding, the molten resin can be stably supplied to the injection mold side through several points in a molten state, so that precision molding can be performed even when the temperature of the molten resin is low or the injection pressure is low.

As shown in FIG. 1, in the conventional hot runner system, a heater is installed on the outer shape of the nozzle to prevent the nozzle runner from being solidified, and the resin supplied through the flow path formed inside is always heated to maintain a temperature suitable for the resin. It is intended to be supplied in a molten state.

In this way, the molten resin can be maintained in a molten state by the heating structure in the nozzle body.

However, the nozzle tip does not have a heating structure, so it has a non-heating section where heat loss occurs due to a relatively low temperature compared to the nozzle body. , there is a problem in that productivity and product quality are lowered as the occurrence of quality problems such as deterioration of molded products, malfunctions, and solidification of gates increases.

KR 10-1410016 B1

In order to solve the above problems, the present invention applies a heating structure to the tip of the nozzle to secure an insufficient temperature at the tip of the nozzle according to core cooling, and to individually control the temperature at the tip of the nozzle, and to improve the durability of the tip. In addition to improving the quality and productivity of molded products through individual temperature control, molding troubles (Gate String, Gate Sealing, Gate Mark, Gate Trouble) are improved, and flexible nozzle structure, it can be produced in various plastic products. An object of the present invention is to provide a hot runner system equipped with a tip heater that can be used.

In order to achieve the above object, the present invention is connected to a manifold and a nozzle body having a first flow path for supplying molten resin; a body heater provided around the nozzle body to heat the nozzle body so as to maintain a molten state of the molten resin flowing along the first flow path; a nozzle tip provided at an end of the nozzle body and having a second flow path to inject the molten resin supplied along the first flow path to the gate; Hot equipped with a tip heater, comprising a tip heater provided around the nozzle tip to heat the nozzle tip so as to maintain the molten state of the molten resin injected into the gate along the second flow path of the nozzle tip A runner system is provided.

A tip ring is further provided at the end of the nozzle tip to insulate the molten resin from outside air into the second flow path and prevent the external exposed resin from flowing into the second flow path.

The nozzle tip is divided into an out tip having the second flow path and an in tip provided through the second flow path to rapidly inject the molten resin into the gate.

By providing the present invention configured as described above, the temperature of the tip of the nozzle can be individually controlled, the tip durability can be improved through material change, and the insufficient temperature of the tip of the nozzle can be satisfied by cooling the core, which occurs during injection molding problems can be improved, and the quality and productivity of molded products are improved.

1 is a block diagram showing a conventional hot runner system.
Figure 2 is a configuration diagram of an embodiment in which a hot runner system equipped with a tip heater according to the present invention is applied to each type.
Figure 3 is another embodiment configuration diagram showing a hot runner system equipped with a tip heater according to the present invention.
Figure 4 is a configuration and partially enlarged view to which a tip ring is applied in a hot runner system equipped with a tip heater according to the present invention.
5 is an enlarged view and a configuration in which a tip ring is applied to a long tip type of a hot runner system having a tip heater according to the present invention.
6 is an exploded view showing a configuration in which a tip ring is applied in a hot runner system equipped with a tip heater according to the present invention.
7 is a configuration and a partial enlarged view of a nozzle tip having an in-tip and an out-tip in a hot runner system equipped with a tip heater according to the present invention.
8 is an exploded view showing a configuration in which a nozzle tip having an in-tip and an out-tip is applied in a hot runner system equipped with a tip heater according to the present invention.
9 is an enlarged view and a configuration in which an outbush cap is applied to a hot runner system equipped with a tip heater according to the present invention.
10 is an exploded view showing a configuration in which an outbush cap is applied to a hot runner system having a tip heater according to the present invention.
11 and 12 are exploded views showing a configuration in which a hot runner system with a tip heater according to the present invention is applied in a mini-nozzle type.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention.

2 is a view showing the configuration of an embodiment in which a hot runner system with a tip heater according to the present invention is applied for each type, and FIG. 3 is another embodiment configuration of a hot runner system with a tip heater according to the present invention 4 is a view showing a configuration and a partial enlargement to which a tip ring is applied in a hot runner system equipped with a tip heater according to the present invention, and FIG. 5 is a hot runner system equipped with a tip heater according to the present invention. It is a view showing a configuration in which a tip ring is applied to a medium long tip type and a partial enlargement. It is a view showing the configuration and partial enlargement of a nozzle tip having an in-tip and an out-tip in a hot runner system equipped with a tip heater according to It is a view showing an exploded view of a configuration to which a nozzle tip having a tip is applied, and FIG. 9 is a view showing a configuration and a partial enlargement of an outbush cap applied to a hot runner system equipped with a tip heater according to the present invention, FIG. It is a view showing an exploded view of a configuration in which an outbush cap is applied to a hot runner system equipped with a tip heater according to the present invention, and FIGS. 11 and 12 are a mini-nozzle type of a hot runner system equipped with a tip heater according to the present invention. It is a diagram showing the decomposition of the applied configuration.

As shown in FIGS. 2 to 12, the hot runner system with a tip heater of the present invention has a nozzle body 100 connected to the manifold 10 and having a first flow path 130 for supplying molten resin and , a body heater 200 provided around the nozzle body 100 to heat the nozzle body 100 so as to maintain the molten state of the molten resin flowing along the first flow path 130, and the nozzle body 100 It may be basically configured to include a nozzle tip 300 having a second flow path 330 provided at the end of the first flow path 130 to inject the molten resin supplied along the gate to the gate.

Here, around the nozzle tip 300, the tip heater 400 for heating the nozzle tip 300 so as to maintain the molten state of the molten resin injected into the gate along the second flow path 330 of the nozzle tip 300. may be provided.

As described above, in the case of the tip heater 400 applied to the periphery of the nozzle tip 300, a heater groove 410 is concave along the outer periphery of the nozzle tip 300, and a heating wire ( 420) is a structure in which wiring is provided.

That is, direct heating to the nozzle tip 300 is possible and the temperature can be individually controlled so that it can be applied from general-purpose resin-applied products to en-pla-based resin-applied product molds.

That is, the temperature of the nozzle tip 300 is individually controlled so as to improve the problem that the molten resin is hardened when injecting the molten resin into the gate of the mold due to the temperature difference between the nozzle body 100 and the nozzle tip 300, and the molding defect occurs. , the durability of the nozzle tip can be improved.

The hot runner system of the present invention is applied to an open type and a valve pin type, so it is possible to improve thread attachment, which is a difficult problem in mold processing, and the quality and productivity of molded products can be improved through individual temperature control.

In addition, it is possible to improve the structure of the nozzle by applying the tip heater 400 to the mini-nozzle type.

According to FIG. 2A , the structure can be improved by applying the tip heater 400 in the structure having the tip ring 600 at the outlet 340 of the open type nozzle tip 300 .

It is preferable that a tip union 700 for preventing exposure of the tip heater 400 to the outside of the nozzle tip 300 is further provided.

A nozzle tip 300 having a second flow path 330 connected through a joint to a first flow path 130 hollow formed in the nozzle body 100 connected to the manifold 10 is connected, and the nozzle tip 300 is provided. ) is connected to the nozzle body 100 but is coupled to each other by a tip union 700 .

At the outlet 340 of the nozzle tip 300, the molten resin temperature is maintained in the second flow path 330 from outside air, and heat loss to the cavity is blocked and insulated, and the mold and the external exposed resin flow into the second flow path 330. A tip ring 600 to prevent it may be provided.

The tip ring 600 has a disk shape, and a protrusion pin 610 that prevents the sagging of the molten resin when injected is protruding from the center, and a plurality of outlets 620 through which the molten resin passes may be formed.

4 and 6, provided in a ring shape around the nozzle body 100 coupled to the manifold 10, but passing through the nozzle body 100 in the hollow part of the body heater 200, the nozzle One end of the nozzle tip 300 is coupled to the end of the body 100 by fitting the socket method, so that the first flow path 130 of the nozzle body 100 and the second flow path 330 of the nozzle tip 300 are in a line. can be connected

The tip union 700 having a male screw is fastened to correspond to the female screw formed inside the socket part 110 of the nozzle body 100, but push the step of the nozzle tip 300 to the end of the tip union 700 and the nozzle body ( 100) can be tightly coupled without gaps.

In addition, a nozzle pipe 900 having a male thread may be provided around the end of the nozzle body 100 in a ring coupling, and separation may be prevented by the close contact jaw 710 of the tip union 700 .

That is, in the case of the open type nozzle tip 300 , threading may occur, but the tip ring 600 is provided at the discharge port 340 of the nozzle tip 300 so that the discharged molten resin flows into the first flow path 130 . It is possible to block resin and heat insulation.

Moreover, as shown in Figure 5, the nozzle tip 300 can be applied by replacing the long tip 350 with a longer length compared to the nozzle tip 300 shown in Figure 4 .

In the case of the long tip 350, the length of the nozzle tip 300 may be adjustable so that it can be applied to a small mold and a place where the space around the gate of the mold part is narrow.

According to FIG. 2B , an open type nozzle body 100 having a first flow path 130 is coupled to the manifold 10 , and the melt flowing in the first flow path 130 around the nozzle body 100 . A body heater 200 for maintaining the molten state of the resin is provided.

In addition, a nozzle tip 300 having a second flow path 330 connected to a pipe corresponding to the first flow path 130 is fastened to the end of the nozzle body 100 .

Here, the nozzle tip 300 includes an out tip 310 having a second flow path 330 ; It may be divided into an in-tip 320 provided through the second flow path 330 .

That is, the molten resin flowing along the first flow path 130 passes through the second flow path 330 , but by narrowing the space of the second flow path 330 by the in-tip 320 , the second flow path 330 . ) can increase the flow rate of the melt through it.

At this time, the in-tip 320 passes through the second flow path 330 and protrudes further from the outlet 340 by a predetermined length compared to the out-tip 310, and forms a pointed end like the seal pin 321 to form the mold of the mold. It is possible to prevent the molten resin from sticking when separating after pouring the molten resin into the gate.

As shown in FIGS. 7 and 8 , it is provided in a ring shape around the nozzle body 100 coupled to the manifold 10 , but the nozzle body 100 passes through the hollow part of the body heater 200 .

And, one end of the nozzle tip 300 is fitted to the end of the nozzle body 100 by fitting the socket method, so that the first flow path 130 of the nozzle body 100 and the second flow path 330 of the nozzle tip 300 are coupled. can be connected in series.

At this time, the nozzle tip 300 is divided into an in-tip 320 having a thread pin 321 and an out-tip 310 having a second flow path 330 , and the in-tip is attached to the socket part 110 of the nozzle body 100 . The ring tuck 323 of the 320 is inserted so that the thread pin 321 of the in-tip 320 extends forward, and the thread pin 321 passes through the second flow path 330 to the coupling jaw of the out tip 310 ( 311 is in close contact with the ring tuck 323 of the in-tip 320 to form the nozzle tip 300 .

Next, the tip union 700 having a male screw corresponding to the female screw formed inside the socket part 110 of the nozzle body 100 is fastened and coupled to the end of the tip union 700, but the coupling jaw of the out tip 310 ( 311) can be pushed to be closely coupled to the nozzle body 100 without a gap.

The tip union 700 having a male screw is fastened to correspond to the female screw formed inside the socket part 110 of the nozzle body 100, but push the step of the nozzle tip 300 to the end of the tip union 700 and the nozzle body ( 100) can be tightly coupled without gaps.

In addition, a nozzle pipe 900 having a male thread may be provided around the end of the nozzle body 100 in a ring coupling, and separation may be prevented by the close contact jaw 710 of the tip union 700 .

Next, as shown in Figs. 2c and 2d, the hot runner system of the present invention can be applied to a valve pin type.

According to FIG. 2c, a nozzle tip 300 having a second flow path 330 that forgets the first flow path 130 is connected to the nozzle body 100 having a first flow path 130, and a tip union 700 is provided. It can be firmly coupled through the fastening of the.

Further, the valve pin 500 penetrates along the first flow path 130 and the second flow path 330 and controls the opening and closing of the discharge port 340 for injection of the molten resin into the gate through forward/backward operation. can be provided.

The valve pin 500 may be formed by having a coupling part connected to a valve device provided at the rear end formed at one end, and an opening/closing part 520 for opening and closing the discharge port 340 at the opposite end flat.

That is, by the operation of the valve device, the valve pin 500 moves forward/backward in the longitudinal direction to open and close the opening/closing part 520 of the valve pin 500 positioned at the outlet 340 to release the molten resin through the outlet 340 . can be ejected.

In the case of the body heater 200, the nozzle body 100 may be heated by the power provided by winding the housing 210 of a cylindrical double container and the coil 220 in the double space.

According to FIG. 2D , when the nozzle body 100 penetrates through the first flow path 130 and has a valve pin 500 , the nozzle tip 300 is integrally formed with the nozzle body 100 , the nozzle tip 300 ) is fastened and coupled to the nozzle cap 800 , and a tip heater 400 may be provided in a space between the nozzle tip 300 and the nozzle cap 800 .

At this time, the outer bush cap 810 is further provided in a ring shape around the nozzle tip 300 so that when the nozzle cap 800 is fastened, the tip heater 400 is more closely attached to the surface of the nozzle tip 300 and blocks heat. can be

9 and 10, in the case of a valve pin type in which the nozzle body 100 and the nozzle tip 300 are integrally formed, the tip heater 400 may be separately applied.

That is, the tip heater 400 is provided with a ring-shaped heat plate 430 in which the nozzle tip 300 is provided between the nozzle caps 800, but along the outer periphery of the heat plate 430, the heater groove ( 410 has a concave recessed structure, and the heating wire 420 is provided with wiring in the heater groove 410 .

As shown in FIG. 3 , it can be applied to a mini-nozzle type.

A nozzle tip 300 having a tip heater 400 is fastened to correspond to the flow path of the manifold 10 , and a portion of the nozzle tip 300 is accommodated in the receiving groove 13 of the cavity plate or disk 12 . It is provided to prevent heat loss due to heat generation of the tip heater 400 .

That is, the tip heater 400 applied to the miniaturized open type can be miniaturized and applied to the mini runner, so that parts can be minimized by optimizing the small mold.

Accordingly, it is possible to reduce manufacturing and maintenance costs through a simplified structure.

In addition, it is possible to prevent reverse inflow of the molten resin injected by the tip ring 600 provided in the discharge port 340 and prevent thread running.

11, the nozzle tip 300 comprises a tip heater 400 having a heating wire 420 in a heater groove 410 on the periphery to configure the nozzle tip 300, but a manifold ( 10), and a tip ring 600 is provided at the outlet 340 by fitting.

According to FIG. 12 , the nozzle tip 300 includes a tip heater 400 having a heating wire 420 in the heater groove 410 on the periphery to configure the nozzle tip 300 , but corresponds to the coupling jaw 311 at the end. Thus, it can be fitted and coupled to the manifold 10 by the coupling ring 305 .

In addition, the tip ring 600 is fitted to the outlet 340 to prevent reverse inflow of the injected molten resin and threading.

By providing the present invention configured as described above, the temperature of the tip of the nozzle can be individually controlled, the tip durability can be improved through material change, and the insufficient temperature of the tip of the nozzle can be satisfied by cooling the core, and the gate problem (Gate) String, Gate Sealing, Gate Mark, Gate Trouble) can be improved, and the quality and productivity of molded products are improved.

In addition, in the point that the maintenance cost is increased due to the inconvenience of replacing the tip due to the resin content or the repeated use process using a tip that has high thermal conductivity but weak strength of the copper alloy in the past, tip heater (400) Through the application of , the tip can be formed with a material with low thermal conductivity but high strength compared to the existing one, which can reduce tip wear during the repeated molding process, so that it can be used for a long time and can reduce maintenance costs. .

The terms and words used in the present specification and claims described above should not be construed as being limited to conventional or dictionary meanings, and the present inventors have adequately defined the concept of terms to describe their invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined in

Accordingly, the configurations shown in the drawings and embodiments described in this specification are merely one of the most preferred embodiments of the present invention, and do not represent all of the technical spirit of the present invention, so they can be substituted at the time of the present application. It should be understood that there may be various equivalents and variations that exist.

100: nozzle body 110: socket part
130: 1st Euro 200: Body heater
210: housing 220: coil
300: nozzle tip 305: coupling ring
310: out tip 311: coupling jaw
320: in tip 321: silpin
323: ring tuck 330: second euro
340: outlet 350: long tip
400: tip heater 410: heater home
420: hot wire 430: heat plate
500: valve pin 520: opening and closing part
600: tip ring 610: protruding pin
620: outlet 700: tip union
710: close contact 800: nozzle cap
810: out bush cap 900: nozzle pipe

Claims (5)

a nozzle body 100 connected to the manifold 10 and having a first flow path 130 for supplying molten resin;
a body heater 200 provided around the nozzle body 100 to heat the nozzle body 100 so as to maintain a molten state of the molten resin flowing along the first flow path 130;
a nozzle tip 300 provided at an end of the nozzle body 100 and having a second flow path 330 to inject the molten resin supplied along the first flow path 130 to the gate;
A tip heater ( 400),
The nozzle tip 300 includes an out tip 310 having a second flow path 330; It is divided into an in-tip 320 that is provided through the second flow path 330 and is configured to quickly inject the molten resin into the gate,
A valve pin 500 that penetrates along the first flow path 130 and the second flow path 330 and controls the opening and closing of the discharge port 340 for injection of the molten resin into the gate through forward/reverse operation is configured. ,
A tip union 700 for preventing external exposure of the tip heater 400 is further configured around the outer periphery of the nozzle tip 300,
A female screw is formed inside the socket part 110 of the nozzle body 100, and an out tip 310 is formed at the end of the tip union 700 through the fastening of the tip union 700 having a male screw corresponding to the female screw. The tip union 700 having a male screw corresponding to the female screw formed inside the socket part 110 of the nozzle body 100 is tightly coupled to the nozzle body 100 without a gap by pushing the coupling jaw 311 of the nozzle body 100 is fastened and coupled However, by pushing the step of the nozzle tip 300 to the end of the tip union 700 and closely coupled to the nozzle body 100 without a gap, the nozzle pipe 900 having an external thread around the end of the nozzle body 100 is ring-coupled. A hot runner system with a tip heater, characterized in that separation is prevented by the close contact jaw 710 of the tip union 700.
delete The method according to claim 1,
At the end of the nozzle tip 300,
A tip ring 600 is further provided to block and insulate heat loss from the outside air toward the molten resin and mold cavity in the second flow path 330 and prevent external exposed resin from flowing into the second flow path 330 . A hot runner system equipped with a tip heater.
delete delete

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