KR20130107717A - Side valve gate nozzle - Google Patents

Abstract

PURPOSE: A side valve gate nozzle is provided to extend the lifetime because the damage or the malfunction relative to a valve pin or a valve pin lift driving unit is low and the transfer distance of the valve pin is relatively small so that the abrasion is less. CONSTITUTION: A side valve gate nozzle (1) comprises a main body (3), a nozzle tip, and a valve pin. A runner (7) penetrates through the inside of the main body and the nozzle tip. The valve pin has a through-hole forming a round route connecting a side gate (13) in which is formed in the front lower end and an opening unit (14) in which is positioned in the rear lower end. The side gate comes in contact with the inner circumferential surface of the nozzle tip and is closed when the valve pin is lifted. A part of the side gate is positioned in the lower part of the nozzle tip and is opened when the valve pin descends.

Description

SIDE VALVE GATE NOZZLE < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side valve gate nozzle, and more particularly, to a side valve gate nozzle, which is free from the problem of occurrence of a burr formation problem due to a halftone dot, a resin flow mark, , While the conventional injection molding apparatus for vertically mounting the nozzles is used as it is, the vertical runner in the nozzle is injected from the side by switching the high temperature and high pressure molten resin in the horizontal direction through the round path formed on the valve pin, To an innovative side valve gate nozzle.

BACKGROUND ART [0002] Generally, a valve gate method for forming a medium-sized injection-molded article is a method in which an injection opening formed in a nozzle tip of an injection molding nozzle, that is, the opening and closing of a gate, The opening is opened and closed.

In the injection-molding apparatus of the valve gate type, most of the injection molding machine has a port, a manifold communicated with the manifold, and a manifold communicated with the manifold. The nozzle is formed by a direct injection molding method in which the nozzle is injected in a state of being directly in contact with a substantially central portion of the upper surface of a cavity in which a molded product is formed in a vertical direction .

Accordingly, since the nozzles are vertically positioned with respect to the cavity in the mold for forming the plate-like molded article such as a large-sized TV, the molten resin of high temperature and high pressure is continuously and continuously injected from the nozzle at one point, The portion of the molded product is excessively heated, so that a malfunction such as halftone dulling is likely to occur. Since the flow of the injection resin at the time of injection is perpendicular to the direction of the cavity in which the molded article is molded, there is a fear that flow line defects may occur and injection pressure is applied through the front surface of the molded product, so that when the mold clamping force is insufficient, burrs may occur due to momentary gaps between the upper and lower molds.

In order to solve the above-described problem, unlike the current injection molding apparatus in which the injection part including the nozzle is located above the front surface of the mold, the injection part including the nozzle uses an injection molding apparatus located on the side surface of the mold, It is necessary to use an injection molding apparatus positioned on the side of the mold. However, such an injection molding apparatus is not realized at all due to problems in design and lack of versatility with other molds.

Therefore, as a conventional method for solving the problems described above, a pan is provided on the side of the cavity in the mold, the nozzle is positioned in the direction perpendicular thereto, and then the molten resin at high temperature and high pressure There has been proposed a fan gate injection molding method in which a cold runner remaining in the fan is removed after the molding is completed and the mold is not horizontally inserted into the cavity so that the halftone defect and the resin flow mark defect do not occur in the molded article, The molten resin of high temperature and high pressure is injected vertically from the nozzle into the fan and collides with the fan vertically and then bends at right angles to flow into the cavity, so that the effect of reducing the mold clamping force is difficult to expect and burrs In accordance with the trend of enlargement of molded products, W, and a problem that a mold clamping force applying mechanism hayeoyaman replacement such as a hydraulic cylinder for pressing the mold, the nozzle is no side valve-gate structure is applied.

Korean Patent Laid-Open Publication No. 10-2010-0008869 (published on Jan. 21, 2010) discloses a valve element having an annular groove or a plurality of recessed grooves forming a side gate or a disk gate, The injection pressure is vertically applied to the resin cut portion of the valve pin and is transmitted to the valve pin. Therefore, when the valve pin is broken There is a possibility that the driving part is damaged or the effect of reducing the mold clamping force is not sufficiently satisfactory.

Accordingly, it is a first object of the present invention to provide a side valve gate nozzle capable of remarkably reducing a mold clamping force by injecting a vertical runner in a nozzle through a round path formed in a valve pin, .

A second object of the present invention is to provide a side gate gate nozzle having a lower risk of damage or breakage of a valve pin or a valve pin lifting and driving part, in addition to the above first object.

A third object of the present invention is to provide a side valve gate nozzle having a relatively long moving distance of the valve pin and having a low wear resistance and a long life reputation.

A fourth object of the present invention is to provide a side valve gate nozzle which is free from the problem of occurrence of a burr formation problem due to a halo or a resin flow mark or a lack of mold clamping force in an injection molded article in addition to the above object.

The fifth object of the present invention is to provide an injection molding apparatus which can use a conventional injection molding apparatus which vertically mounts a nozzle as it is and in addition to the above object, So that there is no need to replace a mold clamping force applying mechanism such as a hydraulic cylinder for a hydraulic cylinder, and thus a side valve gate nozzle having high economical efficiency is provided.

According to a preferred embodiment of the present invention for achieving the above objects, a nozzle and a nozzle tip are provided with a runner through which the runner passes; It has a through-hole forming a round passage for communicating a side gate formed in the front lower end portion and the opening located in the lower rear portion, and consists of a valve pin located in the runner described above: Side valve gate nozzle is closed when the side gate is in contact with the inner peripheral surface of the nozzle tip, and at least a portion of the side gate is located below the nozzle tip when opening the valve pin. nozzles are provided.

According to another preferred aspect of the present invention for smoothly achieving the above object, a side valve in which the side gate is located in the center of a recess formed in the lower end of the front surface and the opening is located in the lower end of the rear surface above the side gate. A gate nozzle is provided.

According to another preferred aspect of the present invention for smoothly achieving the above object, the side gate and the opening is located at the front lower end and the rear lower end of the valve pin, respectively, the upper end of the side gate and the opening is the same Since the bottom portion of the opening is located above the bottom portion of the side gate, the side valve gate nozzle is formed so that resin flows from both the upper side of the side gate and the entire opening when the side gate is opened. Is provided.

According to another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, the method comprising the steps of: There is provided a side valve gate nozzle formed so as to have an inclined gradient.

According to another aspect of the present invention, there is provided a side gate gate nozzle having a step formed at a lower end of the side gate and an extension formed at an end of the valve pin do.

According to another preferred embodiment of the present invention, the valve pin is formed as a polygonal column having a polygonal surface or a slot or a protruding surface formed in a longitudinal direction A side valve gate nozzle formed of a cylindrical columnar body having a plurality of openings is provided.

According to another aspect of the present invention, there is provided an ink jet printer comprising: a main body and a nozzle tip through which a runner passes; At least one annular groove formed in the outer peripheral surface in the longitudinal direction, an annular portion serving as a side gate forming a lower passage of the annular groove and forming a round passage, and a step portion having a step between the annular portion and the bottom surface, Wherein the annular portion is closed by contacting the inner peripheral surface of the nozzle tip when the valve pin rises, and when the valve pin is lowered, the annular portion is located below the nozzle tip A side valve gate nozzle is provided.

According to another preferred embodiment of the present invention, the annular portion forming the round path can smoothly rotate the molten resin at high temperature and high pressure in the horizontal direction from the annular groove in the vertical direction There is provided a side valve gate nozzle which is formed to have a stepwise curved gradient.

According to another aspect of the present invention, there is provided a side valve gate nozzle in which two to four of the annular grooves are spaced apart from each other.

According to another aspect of the present invention, there is provided a side valve gate nozzle having a through hole at the back of the annular groove and communicating with a bottom hole formed at the center of the bottom of the through hole, / RTI >

The side valve gate nozzle according to the present invention is capable of remarkably reducing the mold clamping force by injecting the vertical runner in the nozzle through the round path formed in the valve pin and switching the molten resin of high temperature and high pressure in the horizontal direction and injecting from the side, The valve pin movement distance is relatively small so that there is little wear and no damage to the lifting and driving part. Furthermore, since the wear distance is relatively small, it has a long life reputation, It is possible to apply the present invention directly to a conventional injection molding apparatus in which nozzles are mounted vertically. In addition, in accordance with the trend toward larger molds, a mold clamping force applying mechanism, such as a hydraulic cylinder for pressing a mold, There is little need to replace .

1 is a front view of a main part of a valve pin applied to a side valve gate nozzle according to a preferred embodiment of the present invention.
2 is a side cross-sectional view of a side valve gate nozzle to which a valve pin according to another variant of FIG. 1 is applied.
3 is a bottom perspective view of a main portion of another valve pin applied to a side valve gate nozzle according to another preferred embodiment of the present invention.
4 is a side cross-sectional view of the side valve gate nozzle to which the valve pin of Fig. 3 is applied.
Fig. 5 is another modification of Fig.
Figure 6 is a cross-sectional view of an injection molding apparatus illustrating the application of the side valve gate nozzles of Figures 2 and 4;
Fig. 7 is a schematic diagram showing an application example of the side gate gate nozzle according to the present invention.
Fig. 8 is a schematic view showing an application example of a conventional fan gate valve nozzle.
Fig. 9 is a schematic diagram showing an example of application of a conventional fan gate valve nozzle and a round runner as a comparison.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Prior to a specific description of the valve pins 10, 20 and 20a having round paths applied to the side gate gate nozzles 1 and 1a according to the present invention, The injection molding apparatus 100 that exemplifies the case where the side valve gate nozzle 1, 1 a is applied to the right side and the left side, respectively, will be described first with reference to FIG. 6 which is a sectional view thereof.

The illustrated injection molding apparatus 100 of the valve gate type is known except for the side valve gate nozzles 1, 1 a according to the present invention, and its basic structure is formed by connecting a molten resin pot (not shown) A manifold 130 communicating with the nozzle locator 111 in which the nozzle locator 111 is placed and for injecting molten resin at a high temperature and a high pressure and a mold (not shown) comprising an upper mold 151 and a lower mold 152 A holding plate 160 mounted on the manifold 130 and supported by a holding plate 160 and provided with a cavity 153 for injection molding the molded article in the mold 150 A valve for opening and closing an injection opening (gate) formed in the nozzle tip, which is located in the side valve gate nozzle (1, 1a) and injects a molten resin into the nozzle gate The pins 10, 20 and the valve pins 10, And a driving unit 120 for lifting and lowering.

More specifically, the manifold 130 serves to provide a path for transferring the supplied molten resin to at least one desired position, and typically includes a clamping plate 110 and a holding plate (Not shown).

A nozzle locator 111 for introducing molten resin into the manifold 130 is installed on the upper side of the central portion of the manifold 130. A nozzle locator 111 is disposed inside the manifold 130 A plurality of branched channels 131 are formed for conveying the molten resin to be introduced, and a heater (not shown) for heating and holding the molten resin introduced into the manifold 130 at a predetermined temperature ).

The side valve gate nozzle 1, 1 a according to the present invention for injecting the molten resin into the cavity 153 of the mold 150 is vertically installed at the end of the channel 131 of the manifold 130.

A driving unit 120 such as a pneumatic or hydraulic cylinder for moving the valve pins 10 and 20 up and down is provided above the nozzles 1 and 1 a above the manifold 130, In the present invention, in consideration of the hydraulic pressure applied to the valve pin (1, 1 a), the driving part (120) is provided below the end of the valve pin (1, 1a) It is to be understood that the driving unit 120 may be installed on both sides, and the driving unit 120 may be driven by other means known in the art.

In the figure, reference numeral 140 denotes a center post, and reference numeral 141 denotes a spacer.

The valve pins 10 and 20 are provided through runners of the side valve gate nozzles 1 and 1a according to the present invention and are connected to the valve pins 10 When the valve pins 10 and 20 are lifted, the side gate forming the round path is closed by contacting the inner peripheral surface of the nozzle tip. When the valve pins 10 and 20 are lowered, And will be described later with reference to FIG. 2 and FIG. 4.

The side valve gate nozzle (1, 1a) according to the present invention is provided with a heating means (not shown) such as a hot wire coil or a high frequency induction coil for heating and holding the resin at a predetermined temperature on the outer peripheral surface thereof, (Not shown) for detecting the temperature of the resin inside the gate nozzles 1 and 1 a and a housing 5 for protecting and supporting the heating means provided on the outer circumferential surface of the side valve gate nozzle 1, Is mounted outside the side valve gate nozzle (1, 1 a), and the cover (6) is mounted on the outside of the side valve gate nozzle (1, 1 a).

Referring again to FIG. 1, which is a front view of a main part of a valve pin 10 applied to a side gate valve nozzle 1 according to a preferred embodiment of the present invention, will be described again.

The side gate valve nozzle 1 according to a preferred embodiment of the present invention includes a main body 3 and a nozzle tip 4 through which a runner 7 passes, A valve pin 15 having a through-hole 15 forming a round path for communicating the side gate 13 located at the center of the formed concave portion 12 and the opening 14 located at the bottom of the rear surface above the side gate 13, (10).

The through hole 15 forming the round path can smoothly and smoothly change the molten resin at high temperature and high pressure from the vertical direction to the horizontal direction while preventing the resin injection pressure from being exerted to the valve pin 10 Is formed so as to have a gradual curved gradation gradient and is formed such that the directional change of 90 degrees from the vertical direction to the horizontal direction can be gradual, stepwise, and smoothly occurring smoothly.

The stepped portion 16 can be formed at the lower end of the side gate 13 to reinforce the end portion of the valve pin 10 and the end portion of the valve pin 10 The side gate 13 can be more reliably closed by forming the gate insulating film 18 as the gate insulating film.

As a result, when the valve pin 10 is lifted, the side gate 13 comes into contact with the inner peripheral surface of the nozzle tip 4 and is closed. When the valve pin 10 is lowered, the side gate 13 In the side valve gate nozzle 1 according to the present invention, the lift distance of the valve pin 10 is 3 to 8 mm, suitably about 3 to 5 mm The lift distance of the valve pin 10 can be made much smaller than about 15 mm in the normal case, so that the wear of the valve pin 10 is reduced and the life of the valve pin 10 is relatively long.

In the illustrated example, the valve pin 10 is formed as an octagonal column having octagonal sides. However, the present invention is not limited to this, and the valve pin 10 may be rotated (Not shown) or an embossed protruding frame (not shown) extending in the longitudinal direction of the cylindrical body to form a recessed slot And this is also within the scope of the present invention.

2 is a side cross-sectional view of a side gate valve nozzle 1 to which a modified example of the valve pin 10 of FIG. 1 is applied. In the form of a through hole 15 forming a round path formed in the illustrated valve pin 10 The side gate 13 is formed at the lower end of the front surface of the valve pin 10 and the opening 14 is located at the lower end of the rear surface of the valve pin 10, The round path is formed to be wider so that the side gate 13 and the upper end of the opening 14 are formed at the same height and the bottom portion of the opening 14 is located above the bottom portion of the side gate 13, And the resin can flow in through the side gate 13.

In the present invention, slots may be formed on both sides of the valve pin 10 instead of the through holes 15, and the lower ends of both slots may be formed to communicate with the side gate 13, Area.

3, which is a bottom perspective view of a main portion of another valve pin 20 applied to the side valve gate nozzle 1a according to another preferred embodiment of the present invention, and FIG. 3 which is a bottom perspective view of the valve pin 20 of FIG. 4 which is a side sectional view of the valve gate nozzle 1a will be described together.

The side valve gate nozzle 1a according to another preferred embodiment of the present invention includes a main body 3 and a nozzle tip 4 through which a runner 7 passes, An annular portion 23 serving as a side gate forming a round passage and forming at least one annular groove 22 and a lower end of the annular groove 22 and an annular portion 23 as a side gate, And a valve pin (20) having a step (24) between the bottom (25) and located in the runner (7).

The annular portion 23 forming the round path can smoothly and smoothly change the molten resin of high temperature and high pressure from the vertical direction to the horizontal direction while the resin injection pressure of the valve pin 20 , And is formed such that the directional change of 90 degrees from the vertical direction to the horizontal direction can be gradual, stepwise, and continuously smoothly occur.

As a result, when the valve pin 20 is lifted up, the annular portion 23 as the side gate comes into contact with the inner peripheral surface of the nozzle tip 4 and is closed. When the valve pin 20 is lowered In the side valve gate nozzle 1 according to the present invention, the upward and downward movement distance of the valve pin 20 is 3 to 20 mm, 8 mm, and suitably about 3 to 5 mm, so that the wear of the valve pin 20 is relatively reduced and the valve pin 20 has a relatively long life.

In the illustrated example, four annular grooves 22 are formed at equal distances from each other. However, the present invention is not limited thereto and may be formed by only one, two or three, Within the scope of the present invention.

Next, another modification of FIG. 3 will be described with reference to FIG. 5. However, since the structure thereof is substantially the same as that of FIG. 3, only the difference will be briefly explained to avoid verbosity.

In the illustrated example, a through hole 26 is formed behind each of the annular grooves 23, and the through hole 26 is communicated with the bottom hole 27 formed at the center of the bottom surface, When injected to the upper side, injection is performed in a relatively small amount not only in the four directions in the horizontal direction but also in the direct downward direction, thereby forming a structure capable of exhibiting an effective and good resin filling profile while avoiding the occurrence of the halo phenomenon 3, except that it is the same as that of FIG. 3, so further detailed description thereof will be omitted.

FIG. 7 is a schematic view of an application example of the side gate gate nozzle 1 according to the present invention, FIG. 8 is a schematic view of an application example of a conventional fan gate valve nozzle, and FIG. 9 is a cross- Fig.

7 to 9, the analytical boundary simulation was performed under the same conditions, and the boundary conditions were as follows.

* Resin: Lexan ML3485 (polycarbonate) manufactured by SABIC Innovative Plastics Europe Co.,

       * Filling time: 5 seconds

       * 5 speed control

       * Packing time: 20 seconds

       * Melting temperature: 320 ° C

       * Mold temperature: 90 ℃ and 120 ℃

       * Cooling time: 35 seconds

       * Number of Gates: 3

The results are shown in Table 1 below.

Side valve
The gate nozzle (Figure 2) Conventional fan-gated nozzle Round Runner + Original nozzle (virtual) Strength (ton) 90 ° C 2700 4100 8100 120 DEG C 2500 4400 7400 Average injection pressure (MPa) 90 ° C 28.579 51.058 86.823 120 DEG C 27.314 46.526 78.430

On the other hand, the mold-clamping force measured in the same manner for the conventional direct injection system in which three nozzles are injected vertically directly from the upper surface of the cavity in which the molded article is formed in the mold was 5500 ton at 90 ° C and 4600 ton at 120 ° C.

From the above results, the simulation results clearly show that the mold-closing gate nozzle according to the present invention can be applied to an existing injection molding apparatus to achieve a mold-clamping force reduction effect of about 43% to 51% .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention, You must understand.

11a: side gate valve nozzle according to the present invention
2: Head 3: Body
4: nozzle tip 5: housing
6: Cover 7: Runner
10: side gate pin
11: polygon 12: concave
13: side gate 14: opening
15: through hole 16:
17: Retraction part 18: Extension part
20,20a: side gate pin
21: outer peripheral surface 22: annular groove
23: annular portion 24:
25: bottom 26: through hole
27: Bottom ball
100: injection molding device
110: clamping plate 111: nozzle locator
120:
130: manifold 131: channel
140: center post 141: spacer
150: Mold
151: upper mold 152: lower mold
153: cavity
160: Holding plate

Claims (10)

A main body and a nozzle tip through which a runner passes;
And a valve pin located in the runner, the valve pin having a through-hole forming a round passage communicating with an opening located at a lower side of the rear surface,
When the valve pin is raised, the side gate is closed in contact with the inner circumferential surface of the nozzle tip, and when the valve pin is lowered, at least a part of the side gate is positioned below the nozzle tip to open. Nozzle (side valve gate nozzle). The side valve gate nozzle according to claim 1, wherein the side gate is located at the center of a recess formed in the lower end of the front surface, and the opening is located at the bottom of the rear surface above the side gate. 2. The bottom of the opening according to claim 1, wherein the side gate and the opening are located at the front lower end and the rear lower end of the valve pin, respectively, and the upper end of the side gate and the opening are formed at the same height while the bottom of the opening is lower than the bottom of the side gate. The side valve gate nozzle is formed so that the resin flows from both the upper side of the side gate and the entire side of the opening when the side gate is opened by the upper side. According to any one of claims 1 to 3, wherein the through-holes forming the round path is a stepwise gradient gradient (gradient) so that the high-temperature high-pressure molten resin can be smoothly redirected from the vertical direction to the horizontal direction The side valve gate nozzle is formed to have. The side valve gate nozzle according to any one of claims 1 to 3, wherein a stepped portion is formed at a lower end of the side gate, and an extension is formed at an end of the valve pin. The valve pin according to any one of claims 1 to 3, wherein the valve pin is formed of a polygonal pillar having a polygonal surface, or formed of a cylindrical pillar formed to have a slot or a protruding frame elongated in the longitudinal direction. Side valve gate nozzle. A main body and a nozzle tip through which a runner passes;
At least one annular groove formed in the outer circumferential surface in the longitudinal direction, an annular portion in a side gate forming a lower passage of the annular groove and forming a round passage, And a valve pin located in said runner, said valve pin having:
Wherein the annular portion is closed when the valve pin is lifted and the annular portion is closed by being in contact with the inner peripheral surface of the nozzle tip, and when the valve pin is lowered, the annular portion is positioned below the nozzle tip, nozzle. The method according to claim 7, wherein the annular portion forming the round path is formed to have a stepwise curved gradient so that the molten resin of high temperature and high pressure can be smoothly turned in the horizontal direction from the annular groove in the vertical direction The side valve gate nozzle is turned. The side gate gate nozzle according to claim 7, wherein two to four of the annular grooves are spaced apart from each other. The side gate gate nozzle according to claim 7, wherein a through hole is formed at the rear of the annular groove and the through hole is communicated with a bottom hole formed at the center of the bottom.

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