KR101170547B1 - Cold runner block open nozzle mold for liquid silicon rubber - Google Patents

Abstract

The present invention relates to a spiral open nozzle mold of a cold runner block for liquid silicone rubber mold, comprising: an upper mold (10) for injecting liquid silicone rubber from the upper portion; A nozzle body 20 formed integrally with the upper mold 10; An injection molding injection hole (12) which is an injection hole for injecting liquid silicone rubber from the upper mold; An open nozzle 30 which is installed in close contact with the injection hole 12 and has a structure for cooling liquid silicone rubber (LIQUID SILICON RUBBER; "LSR"); A waterproof insulating part 40 which wraps the open nozzle 30 from the outside and insulates and waterproofs; And a cooling water supply pipe (50) having a pipe for supplying cooling water for cooling the injection product through the nozzle body (20).

Description

Spiral open-nozzle mold of cold runner block for liquid silicone rubber mold {COLD RUNNER BLOCK OPEN NOZZLE MOLD FOR LIQUID SILICON RUBBER}

The present invention relates to a spiral open nozzle mold of a cold runner block for a liquid silicone rubber mold, and particularly to a liquid silicone rubber mold for shortening the curing time during the molding of the liquid silicone rubber and to enabling a composite joint molding without pretreatment coating. A spiral open nozzle mold of a runner block.

Recently processed liquid silicone rubber (LIQUID SILICON RUBBER; also referred to as 'LSR') is used not only for its own use but also to replace general rubber products as raw material prices decrease.

The spread of the liquid silicone rubber is because the preparatory process of raw materials is unnecessary by adjusting the ingredients at the raw material maker side, so that the storage properties are good, and thus the working environment at the time of molding is good. In addition, when the same thickness as compared to the compression molding using general rubber, the curing time is short enough to be equivalent to one of the moisture, so that the number of molds required can be reduced by that, the productivity is increased and the efficiency of the liquid silicone rubber is increased. Because.

In addition, liquid silicone rubber is used as a flexible elastic material and competes with TP elastomer. However, liquid silicone rubber is widely used because of its high price and good heat resistance and good durability and feel of elasticity. In addition, the filler contains almost zero shrinkage, and it is possible to perform complex adhesive molding without pretreatment coating, thereby achieving high functionality and high added value. In addition, since the raw material maintains a low viscosity state, low pressure molding is possible, and there is an advantage of not damaging the encapsulation material.

Examples of the molded article using such liquid silicone rubber include the following ones. That is, 1) molded products utilizing cleanliness include medical devices, packing machines for prototype machines, nipples of bottled bottles, parts of cathetels, etc. 2) molded articles utilizing heat resistance include anode caps, grammets and plug boots. , Heat-resistant packing, thermos packing, lunch box packing, wire seal, inner seal, etc. 3) Molded products utilizing long life and transparency of elasticity include computer keyboard and diving mask parts. BACKGROUND ART As a molded article utilizing offset properties and heat resistance, its use is spreading, such as being used in roll products such as copiers and facsimiles.

Figure 1 (a) is a block diagram showing a molding structure of a liquid silicone rubber having one cavity (One Cavity) generally used, (b) is a liquid silicone rubber having one cavity (One Cavity) It is a state figure which shows the shape of sprue and burrs which arise in the product produced by the molding structure.

Referring to the drawing will be described with respect to the molding structure of the liquid silicone rubber having a generally used circular cavity, as shown in Fig. 1 (a), when the liquid silicone rubber is supplied through the cavity formed on the upper part of the mold Liquid silicone rubber is supplied according to the characteristic of heating through the heater cartridge formed in the main body.
However, in this case, as shown in (a) of FIG. 1, unnecessary by-products such as sprues and burrs are generated in the injected product according to the shape of the injected cavity. Since the liquid silicone rubber thus produced is an unnecessary component, a problem arises in that sprues and burrs are removed through separate operations.
In more detail, in the related art, when the liquid silicone rubber is supplied through the cavity formed in the upper portion of the mold, a phenomenon occurs in which the liquid silicone rubber spreads around the injection hole in which the injection is injected. Burrs were generated, resulting in a large loss of raw materials.

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In addition, according to the heat generated from the heater cartridge formed in the main body there is a big problem that the productivity is very low because the by-products generated from the product must be cooled to cool.

That is, in the molding process generally used, the removal of raw and auxiliary materials due to the generation of sprues and burrs occurs and industrial wastes are generated. As these by-products have to be removed, the necessity of preventing the decrease in productivity that arises arises.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to quickly cool liquid silicone rubber supplied in a molding structure of liquid silicone rubber, and to form sprues and burrs. The present invention provides a spiral open nozzle mold of a cold runner block for a liquid silicone rubber mold that prevents the formation of by-products such as

Another object of the present invention is for a liquid silicone rubber mold for significantly improving the productivity per unit time by preventing the generation of loss and burr generated during the molding of the liquid silicone rubber (LSR) supplied in the molding structure of the liquid silicone rubber. The object is to provide a spiral open nozzle mold of a cold runner block.

Spiral open-nozzle mold of the liquid silicone rubber mold cold runner block according to the present invention for achieving the above object, to form a cold runner block (Cold Runner Block) to cool the liquid silicone rubber (LIQUID SILICON RUBBER) An upper mold 10; An injection molding injection port (12) which branches from the cold runner block to an individual nozzle and forms a path for injecting the injection molding; A mold body 20 integrally formed with the upper mold 10 and having a nozzle shape; Heater cartridges 24a and 24b attached to the center left and right sides of the mold body 20 to heat liquid silicone rubber introduced through the injection hole 12; An open nozzle 30 installed in close contact with the injection hole 12 to form a cooling path of the liquid silicone rubber; Cooling water supply pipe is installed in the mold body 20 in the longitudinal direction, is installed to cross the upper portion of the open nozzle 30, supplying the cooling water for cooling the injection injected into the nozzle tube 38 in the open nozzle ( 50); Installed between the cooling water supply pipe formed in the mold body 20 and heater cartridges 24a and 24b to prevent penetration of the cooling water administered through the cooling water supply pipe, and to provide heat through the heater cartridge. Waterproof insulation unit 40 for blocking the together; And a mold nozzle 60 formed at an end of the mold body 20 to emit liquid silicone rubber.

At this time, the waterproof insulation part 40 is made of a synthetic resin material, surrounds the open nozzle 30 from the outside, and supplements the synthetic resin to apply pressure to prevent the liquid silicone rubber from flowing out, and lengthens the runner length of the open nozzle. It is preferable that it is comprised so that correction may be possible.

In addition, the first O-ring 32 and the second O-ring 34 are installed at a position before the contact portion of the cooling water supply pipe 50 and the open nozzle 30, the third O-ring 36 is the cooling water supply pipe ( 50) and the open nozzle 30 is preferably a structure that is installed in the position after the contact portion.

In addition, the temperature of the nozzle pipe portion 38 penetrating the inside of the open nozzle 30 is preferably kept constant regardless of external conditions.

In addition, the outer side of the nozzle pipe portion 38 penetrating the center of the open nozzle 30 is preferably configured to further provide a spiral formed in two rows of spiral.

According to the spiral open nozzle mold of the cold runner block for liquid silicone rubber mold according to the present invention, the liquid silicone rubber (LSR) supplied in the molding structure of the liquid silicone rubber is rapidly cooled, and sprues and burrs ( It provides a spiral open nozzle mold of a cold runner block for a liquid silicone rubber mold that prevents the formation of by-products.

In addition, according to the open nozzle apparatus using the spiral open nozzle mold of the cold runner block for liquid silicone rubber mold of the present invention, it is possible to prevent the loss and burr generated during the molding of the liquid silicone rubber (LSR), It is possible to provide a spiral open nozzle mold of a cold runner block for a liquid silicone rubber mold.

Figure 1 (a) is a block diagram showing a molding structure of a liquid silicone rubber having one cavity (One Cavity) generally used, (b) is a liquid silicone rubber having one cavity (One Cavity) State diagram showing the shape of sprues and burrs generated in the product produced by the molding structure,
FIG. 2 (a) is an overall configuration diagram showing a cold runner block type spiral open nozzle mold composed of a one cavity one nozzle in a liquid silicone rubber according to a preferred embodiment of the present invention, and FIG. State diagram showing the burr state of the product produced in the forming structure of the one cavity one nozzle by
3 is an enlarged view illustrating an enlarged configuration of an open nozzle illustrated in FIG. 2A;
4 is a block diagram showing a spiral open nozzle device of a cold runner block for a liquid silicone rubber mold employing an open nozzle according to the present invention;
5 is an explanatory diagram for explaining the action of the open nozzle shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

This application is a divisional application based on a patent application No. 10-2008-0087969, filed on September 5, 2008, entitled "Spiral Open Nozzle Device of Cold Runner Block for Liquid Silicone Rubber Mold".

(Example)

FIG. 2 (a) is an overall configuration diagram of a cold runner block type spiral open nozzle mold composed of a one cavity one nozzle in a liquid silicone rubber according to a preferred embodiment of the present invention, and FIG. Fig. 3 is a state diagram showing a burr state of a product produced in a molding structure of a one cavity one nozzle according to a), and Fig. 3 shows the configuration of the open nozzle shown in Fig. 2A. Figure 4 is an enlarged view showing an enlarged view, Figure 4 is a block diagram showing a spiral open nozzle device of a cold runner block for a liquid silicone rubber mold employing an open nozzle according to the present invention, Figure 5 is a (a) in FIG. It is explanatory drawing for demonstrating the action of the open nozzle shown.

In the figure, reference numeral 10 denotes an upper mold, reference numeral 12 denotes an injection hole for injecting injection, reference numeral 14 denotes an injection tube into which liquid silicone rubber is injected, and reference numeral 20 denotes a body of the mold. 24A and 24B denote heater cartridges that provide an appropriate temperature to the liquid silicone rubber which is installed in the body 20, and 30 denotes an open nozzle according to the present invention. 40 shows a waterproof insulation unit which surrounds the outside of the open nozzle 30 and inserts a synthetic resin to correct the waterproofing and the nozzle length, and a reference numeral 50 denotes the cooling water in the open nozzle 30 through the nozzle body 20. A cooling water supply pipe having a pipe for supplying the water is shown, and reference numeral 60 denotes a mold nozzle, respectively.

Here, the nozzle body 20 has a body end 28 is formed in a concave shape (or trapezoidal shape, etc.) where the injection is discharged, and the open nozzle 30, the first, second, third O-ring (O-RING) 32, 34, 36 are provided, and a nozzle gate 62 for ejecting an injection product is formed at an end of the nozzle, and the nozzle gate 62 is welded. have.

2 to 5, the spiral open nozzle device of the cold runner block for liquid silicone rubber mold according to the present invention, the upper mold 10 for injecting the liquid silicone rubber from the top; A nozzle body 20 formed integrally with the upper mold 10; An injection nozzle injection hole 12 which is an injection hole for injecting the liquid silicone rubber from the upper mold and an open nozzle 30 installed in close contact with the injection injection hole 12 to cool the liquid silicone rubber; A waterproof insulating part 40 which wraps the open nozzle 30 from the outside and insulates and waterproofs; It can be seen that comprising a; a cooling water supply pipe 50 having a pipe for supplying the cooling water for cooling the injection through the nozzle body 20.

The injection molded product produced by the spiral open-nozzle mold of the liquid silicone rubber mold cold runner block according to the configuration shown in FIG. 2 (a) is sprue or burr as shown in FIG. It can be seen that the output is in a clean form without burrs).

Referring to FIG. 3, the open nozzle 30 according to the present invention includes a first O-ring inserting hole 33 and a second O-ring 34 for inserting the first O-ring 32 to help maintain a constant waterproof and temperature. A second O-ring insert 35 is provided for insertion. In addition, an end portion of the open nozzle 30 is formed with a nozzle gate 62 having a sharply protruded end portion and an open end portion.

In this way, the shape of the nozzle gate 62 formed at the end of the open nozzle 30 described above is a tip end having a sharp tip, and the tip nozzle gate 62 is directly connected to the body end ( 28) can be achieved by having a configuration for emitting the injection.
In addition, by having a resin packing made of a synthetic resin material on the outside of the open nozzle 30, the liquid silicone rubber introduced from the outside is provided with a leakage preventing function to prevent leakage to the outside of the injection hole 12, In addition, the resin packing made of the synthetic resin material provides a structure in which sprues are not formed by correcting the length of the nozzle tube 38.
Although not shown, the action of the resin packing made of the synthetic resin material is to press the open nozzle 30 installed therein while covering the mold body 20 to correct the length of the nozzle tube 38 as described above. Will be.

By such a configuration, the spiral open nozzle 30 of the cold runner block for liquid silicone rubber mold according to the present invention achieves a configuration in which the liquid silicone rubber injected from the outside is not leaked to the outside, and continues in a constant amount. By being able to supply and not leaking to the surroundings, a configuration is achieved which does not generate sprues or burrs.
In addition, the open nozzle 30 is a synthetic resin for not leaking the liquid silicone rubber (LIQUID SILICON RUBBER; LSR) in close contact with the injection hole 12, and the first O-ring (32) to prevent leakage of cooling water , The second O-ring 34 and the third O-ring 36 are provided at intervals, and a nozzle tube portion 38 for supplying the liquid silicone rubber to be introduced is installed at the center thereof, and the outside of the nozzle tube portion 38 is provided. The pipe 39 is made of a stainless steel (SUS) to surround it, and is configured to form a nozzle gate 62 having a tip-shaped outlet having a pointed end to discharge liquid silicone rubber so as not to leak. do. In the present invention, the material of the pipe is made of stainless, but any material may be applied as long as the material can maintain the cooling temperature inside without contaminating the cooling water supplied. At this time, the open nozzle 30 is in close contact with the injection inlet 12 of the upper mold 10, is sealed with a synthetic resin member in order not to leak the liquid silicone rubber to be administered.

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Referring to FIG. 4, when the open nozzle 30 according to the present invention is installed, a gap formed between the mold and the mold is inserted and supplemented with synthetic resin (insulator material) to prevent the liquid silicon from leaking out, and You can adjust the length to increase or decrease. This can be adjusted by replenishing the synthetic resin (insulation body) by checking the user when the temperature difference occurs or deformation in the actual injection process. Here, it can be seen that a pipe 39 made of sus material for preventing corrosion is formed outside the nozzle tube portion 38.

In the present invention, the number of open nozzles is illustrated as one, but the number can be expanded within a range of 1 to 256, and is not affected by the number of installations. This realizes the advantage of dramatically increasing the output per unit time.

Next, as shown in FIG. 5, when the temperature of the open nozzle 30 maintains the temperature of the cooling water supplied (for example, at 20 degreeC), the nozzle pipe part 38 will be lengthwise. It is possible to make the ejection of the injection molding uniformly by maintaining the same temperature continuously while flowing along. For example, even when the outside temperature is 180 ° C, the liquid silicone rubber penetrating the nozzle tube 38 may maintain 20 ° C which is initially cooled and supplied. In FIG. 5, two rows of grooves are formed in the inner nozzle tube part 38 to implement a feature of keeping the internal temperature constant.

In the present invention, three O-rings surrounding the outside of the open nozzle 30 are configured, but the number can be increased or decreased as necessary.

Next, the first O-ring 32 and the second O-ring 34 are installed in front of the portion where the coolant supply pipe 50 and the open nozzle 30 come into contact with each other (before), and the third O-ring 36 is The cooling water supply pipe 50 and the open nozzle 30 is in contact with the rear portion (after) to be installed. In this way, the waterproofing function and the internal temperature conditions are kept constant.

In addition, the outer side of the nozzle pipe portion 38 penetrating the center of the open nozzle 30 is configured to provide a spiral section 31 which is a spiral of two lines. By doing in this way, the structure of a nozzle can be maintained firmly and the temperature of the cooling water which flows inside can be made uniform.

According to the spiral open nozzle apparatus of the cold runner block for liquid silicone rubber mold according to the present invention as described above, in forming the liquid silicone rubber, the liquid silicone rubber is in the vicinity of the injection hole in which the injection is injected when the liquid silicone rubber is supplied. This prevents the spread of spores and burrs by-products, and can reduce the manpower required to remove these by-products and dramatically improve productivity. Will have

Description of the Related Art [0002]
10: upper mold 12: injection molding hole
20: mold body 24a, 24b: heater cartridge
30: open nozzle 31: spiral part
32: first O-ring 33: first O-ring insertion hole
34: 2nd O-ring 35: 2nd O-ring insertion hole
36: third O-ring 40: waterproof insulation
50: cooling water supply pipe 60: mold nozzle
62: nozzle gate

Claims (1)

An upper mold 10 for forming a cold runner block for cooling and injecting liquid silicon rubber (LIQUID SILICON RUBBER);
An injection molding injection port (12) which branches from the cold runner block to an individual nozzle and forms a path for injecting the injection molding;
A mold body 20 integrally formed with the upper mold 10 and having a nozzle shape;
Heater cartridges 24a and 24b attached to the center left and right sides of the mold body 20 to heat liquid silicone rubber introduced through the injection hole 12;
An open nozzle 30 installed in close contact with the injection hole 12 to form a cooling path of the liquid silicone rubber;
Cooling water supply pipe is installed in the mold body 20 in the longitudinal direction, is installed to cross the upper portion of the open nozzle 30, supplying the cooling water for cooling the injection injected into the nozzle tube 38 in the open nozzle ( 50);
Installed between the cooling water supply pipe formed in the mold body 20 and heater cartridges 24a and 24b, to prevent penetration of the cooling water administered through the cooling water supply pipe, and to provide heat through the heater cartridge. Waterproof insulation unit 40 for blocking the together; And
And a mold nozzle (60) formed at an end of the mold body (20) to eject liquid silicone rubber. The spiral open nozzle mold of a cold runner block for a liquid silicone rubber mold comprising: a mold nozzle (60).

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