KR20100028978A - Cold runner block open nozzle apparatus for liquid silicon rubber - Google Patents

Abstract

PURPOSE: A cold runner block open nozzle apparatus for a liquid silicone rubber are improve productivity by preventing loss and burr generated in molding LSR. CONSTITUTION: A cold runner block open nozzle apparatus for a liquid silicone rubber includes a mold upper part(10), a mold body(20), an injection port(12), an open nozzle(30), an insulating unit(40), and a cooling water supply part(50). The mold upper part is inserted into a LSR downwardly. The injection port supplies LSR from the mold upper part. The open nozzle adheres closely to the injection port. The open nozzle cools the LSR. The insulating unit covers the open nozzle and is functioned as insulation and waterproofing.

Description

COLD RUNNER BLOCK OPEN NOZZLE APPARATUS FOR LIQUID SILICON RUBBER}

The present invention relates to a spiral open nozzle device of a cold runner block for a liquid rubber silicone mold, and in particular, a liquid rubber silicone mold cold for greatly shortening the curing time when forming the liquid silicone rubber and enabling complex joint molding without pretreatment coating. It relates to a spiral open nozzle device 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, since the curing time is short enough to correspond to one minute of water when the thickness is the same as that of compression molding using general rubber, the number of molds required can be reduced by that, resulting in higher productivity and higher utility of LSR. to be.

In addition, LSR is a flexible elastic raw material and competes with TP elastomer, but LSR 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 molded articles using such LSR include the following. 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 an LSR having one cavity (One Cavity) generally used, (b) is a LSR molding structure having one cavity (One Cavity) It is a state figure which shows the shape of sprue and burrs which arise in the produced product.

Referring to the drawings, a molding structure of an LSR having a generally used circular cavity will be described. When the LSR is supplied through a cavity formed in the upper portion of the mold, as shown in FIG. The liquid LSR is supplied in accordance with the property of heating through the formed heater cartridge.

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 generated LSR is an unnecessary component, a problem arises in that sprues and burrs must be removed through separate work.

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 rapidly cool an LSR supplied in a molding structure of liquid silicone rubber, and to produce sprues, burrs, and the like. It is an object of the present invention to provide a spiral open nozzle device of a cold runner block for a liquid rubber silicone mold to prevent the formation of by-products.

Another object of the present invention is to provide a spiral open nozzle device of a cold runner block for a liquid rubber silicone mold which improves productivity per unit time by preventing the generation of losses and burrs generated during LSR molding.

Spiral open nozzle device of the liquid rubber silicone mold cold runner block according to the present invention for achieving the above object, the mold upper portion 10 for injecting the liquid silicone rubber at the imaginary part; A mold body 20 formed integrally with the mold upper portion 10; An injection inlet 12 which is an injection hole for injecting liquid silicone rubber from the upper part of the mold; An open nozzle 30 in close contact with the injection inlet 12 and having a structure for cooling a liquid silicone rubber ("LSR"); A heat insulating part 40 which wraps the open nozzle 30 from the outside and insulates and waterproofs; And a cooling water supply unit 50 having a pipe for supplying cooling water for cooling the injection molded product through the mold body 20.

At this time, the open nozzle 30 is a synthetic resin for not leaking the liquid silicone rubber to be in close contact with the injection inlet 12, the first O-ring 32 for preventing 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 LSR to be introduced is installed at the center thereof, and the nozzle tube portion 38 is wrapped around the outside of the nozzle tube portion 38. It is preferred that the pipe 39 is made of stainless steel, and is configured to form a nozzle end 60 at its end having a tip-shaped outlet having a pointed shape to discharge the LSR from leaking.

According to the spiral open nozzle apparatus of the cold runner block for liquid rubber silicone mold according to the present invention, the LSR supplied in the forming structure of the liquid silicone rubber is rapidly cooled, and sprue and burrs by-products are generated. To implement the effect of providing a spiral open nozzle device of the cold runner block for a liquid rubber silicone mold to prevent the.

Further, according to the present invention, it is possible to provide a spiral open nozzle device of a cold runner block for a liquid rubber silicone mold which not only prevents the loss and burr generated during LSR molding but also improves productivity.

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

(Example)

FIG. 2 (a) is an overall configuration diagram showing a cold runner block type spiral open nozzle device 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, Figure 4 is a block diagram showing a spiral open nozzle device of a cold runner block for a liquid rubber silicone mold employing an open nozzle according to the present invention, Figure 5 is a (a) It is explanatory drawing for demonstrating the action of the open nozzle shown.

In the figure, reference numeral 10 denotes a side for injecting liquid silicone rubber into the upper part of the mold, reference numeral 12 denotes an injection inlet for injecting injection, reference numeral 14 denotes an injection tube into which liquid silicone rubber is injected, and reference numeral 20 denotes a mold Body is shown, 24a, 24b is a heater cartridge (heater) to give the appropriate temperature to the LSR is installed and put in the body 20, 30 is an open nozzle (open nozzle) employed by the present invention No. 40 denotes a heat insulating part which surrounds the outside of the open nozzle 30 and inserts a synthetic resin to correct waterproofness and nozzle length, and 50 denotes an open nozzle (through the mold body 20). A cooling water supply unit having a pipe for supplying cooling water to 30 is shown, and reference numeral 60 denotes a nozzle end of the open nozzle 30, respectively.

Here, the body end 28 is formed in the mold body 20 in a concave shape (or trapezoidal shape, etc.) where the injection is discharged, and the open nozzles 30 have first, second and third O-rings. (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 rubber silicone mold according to the present invention, the upper mold 10 for injecting the liquid silicone rubber from the top; A mold body 20 formed integrally with the mold upper portion 10; An injection nozzle 12 which is an injection hole for injecting liquid silicone rubber from the upper part of the mold, and an open nozzle 30 installed in close contact with the injection injection hole 12 to cool the liquid silicone rubber; A heat insulating part 40 which wraps the open nozzle 30 from the outside and insulates and waterproofs; It can be seen that it comprises a; a cooling water supply unit 50 having a pipe for supplying cooling water for cooling the injection through the mold body 20.

The injection molded product produced by the spiral open nozzle device of the cold runner block for liquid rubber silicone mold 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, the end of the open nozzle 30 is formed with a nozzle end 6, the end of which is sharply projected and the end is open.

In this way, the shape of the nozzle end 60 formed at the end of the open nozzle 30 described above is a tip-shaped end having a pointed tip, and the tip-shaped nozzle end 60 is directly the body end ( 28) can be achieved by having a configuration for emitting the injection.

In addition, the outside of the open nozzle 30 is provided with a heat insulating portion 40 made of a synthetic resin material to add a waterproof function so as not to spill the liquid silicone rubber introduced from the outside, the length of the nozzle pipe 38 By correcting this, it provides a structure that does not form a sprue.

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 inlet 12, 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 LSR to be introduced is installed at the center thereof, and the outside of the nozzle tube portion 38 is provided. A pipe (39) made of stainless steel (sus) is enclosed, and the end is configured to form a nozzle end 60 having a tip-shaped pointed outlet at the end to discharge the LSR from leaking. 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.

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 cooling water supply unit 50 and the open nozzle 30 come into contact with (before), and the third O-ring 36 is The cooling water supply unit 50 and the open nozzle 30 are 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 rubber silicone mold according to the present invention as described above, in forming the liquid silicone rubber, as well as preventing the production of sprue and burrs by-products, The manpower required to remove these by-products can be reduced, and the productivity can be dramatically improved.

Figure 1 (a) is a block diagram showing a molding structure of an LSR having one cavity (One Cavity) generally used, (b) is a LSR molding structure having one cavity (One Cavity) State diagram showing the shape of sprues and burrs generated in the resulting product,

FIG. 2 (a) is an overall configuration diagram showing a cold runner block type spiral open nozzle device 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 according to a),

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 rubber silicone 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.

* Description of the symbols for the main parts of the drawings *

10: upper part of the mold 12: injection hole

20: mold body 24a, 24b: heater cartridge

30: Open nozzle 31: Spiral 2-row screw

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: heat insulation

50: cooling water supply 60: nozzle end

62: nozzle gate

Claims (6)

A mold upper portion 10 for injecting liquid silicone rubber from the upper portion; A mold body 20 formed integrally with the mold upper portion 10; An injection inlet 12 which is an injection hole for injecting liquid silicone rubber from the upper part of the mold; An open nozzle 30 in close contact with the injection inlet 12 and having a structure for cooling a liquid silicone rubber ("LSR"); A heat insulating part 40 which wraps the open nozzle 30 from the outside and insulates and waterproofs; And a cooling water supply unit (50) having a pipe for supplying cooling water for cooling the injection product through the mold body (20). The method of claim 1, wherein the open nozzle 30 is a synthetic resin for not leaking the liquid silicone rubber to be in close contact with the injection inlet 12, and the first O-ring (32), the second for preventing leakage of cooling water The O-ring 34 and the third O-ring 36 are provided at intervals, and a nozzle tube portion 38 for supplying the LSR to be introduced is installed at the center of the O-ring 34 and the outside of the nozzle tube portion 38. Pipe (39) made of a material, the liquid rubber silicone mold, characterized in that configured to form a nozzle end (60) having a tip-shaped outlet of the pointed end to discharge the LSR so as not to leak Spiral open nozzle device of cold runner block. According to claim 1, wherein the heat insulating part 40 is a synthetic resin material, by surrounding the open nozzle 30 from the outside, by adding a synthetic resin to the pressure to prevent the liquid silicone rubber to flow out, the runner of the nozzle ( RUNNER) Spiral open-nozzle device of a cold runner block for liquid silicone molds, characterized in that the length is corrected. According to claim 2, wherein the first O-ring 32 and the second O-ring 34 is installed at a position before the contact portion of the coolant supply 50 and the open nozzle 30, the third O-ring 36 Spiral open nozzle device of the cold runner block for a liquid rubber silicone mold, characterized in that the cooling water supply unit 50 and the open nozzle 30 is installed in a position after the contact portion. The spiral open nozzle of the liquid rubber silicone mold cold runner block according to claim 1, wherein the temperature of the nozzle pipe portion 38 penetrating the inside of the open nozzle 30 is kept constant regardless of external conditions. Device. The liquid rubber silicone mold cold according to claim 1, characterized in that a spiral portion formed in two rows is formed on the outside of the nozzle pipe portion 38 penetrating the center of the open nozzle 30. Spiral open nozzle device of runner block.

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