KR101384323B1 - Molding device for injection compression molding and method using the same - Google Patents

Molding device for injection compression molding and method using the same Download PDF

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Publication number
KR101384323B1
KR101384323B1 KR1020100097900A KR20100097900A KR101384323B1 KR 101384323 B1 KR101384323 B1 KR 101384323B1 KR 1020100097900 A KR1020100097900 A KR 1020100097900A KR 20100097900 A KR20100097900 A KR 20100097900A KR 101384323 B1 KR101384323 B1 KR 101384323B1
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KR
South Korea
Prior art keywords
mold
injection
surface
pressing
resin
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KR1020100097900A
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Korean (ko)
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KR20120036176A (en
Inventor
문초록
황철환
오수석
이언석
Original Assignee
주식회사 엘지화학
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Priority to KR1020100097900A priority Critical patent/KR101384323B1/en
Publication of KR20120036176A publication Critical patent/KR20120036176A/en
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Publication of KR101384323B1 publication Critical patent/KR101384323B1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/46Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561Injection-compression moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/27Sprue channels Runner channels or runner nozzles
    • B29C45/2701Details not specific to hot or cold runner channels
    • B29C45/2708Gates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/38Cutting-off equipment for sprues or ingates

Abstract

The present invention discloses an injection compression molding apparatus for producing an injection compression molding product and an injection compression molding method using the same.
The mold apparatus for injection compression molding of the present invention includes a first pressing portion, a first mold installed on the first pressing portion, a second pressing portion disposed at a position facing the first pressing portion, and moved by a driving means, and a second pressing portion. A second mold disposed at a position facing the first mold and disposed at a position facing the first mold; a gap maintaining member and a gap maintaining member disposed on one side of the second mold and adhered to one surface of the first mold; 1, a support portion for pushing to the mold side, and a resin injection portion provided with the injection hole filling the resin in the cavity provided in the first mold and the first mold and the second mold are bonded to each other,
In the process of compressing the resin filled in the cavity by bringing the first mold and the second mold into close contact with each other, the gate may be cut by the first mold and the second mold.

Description

Mold device for injection compression molding and injection compression molding method using the same {Molding device for injection compression molding and method using the same}

The present invention relates to an injection compression molding apparatus for producing an injection compression molding product, and an injection compression molding method using the same.

Conventional general injection molding charges the molten resin metered into a predetermined space after the mold is closed. At this time, high pressure resin is filled in the predetermined space, and molding pressure is applied. Such excessive molding pressure affects the product, causing problems such as appearance defects, warping, and birefringence. Therefore, an injection compression molding method is mainly used in producing a thin film molded article such as a light guide plate or an optical product, rather than a general injection molding.

Injection compression molding is a molding method in which a resin is filled in a cavity in a state that the cavity is thicker than the actual product thickness, that is, the cavity is not completely closed, and then the mold is closed. Such injection compression molding can achieve a pressure reduction effect because the required pressure is significantly lower than the injection filling pressure in general injection molding.

Conventional injection compression molding is performed by filling a cavity with resin and compressing a mold and then cooling and solidifying or curing to form a molded product and cutting a gate using a separate cutting device. The conventional injection compression molding has a problem in that the structure of the injection compression molding apparatus is complicated because a device for cutting a gate is added as a separate device. In addition, since the method using the injection compression molding apparatus has a separate gate cutting process, the tack time is increased and the working process time is increased, thereby reducing productivity.

Therefore, the present invention is proposed to solve the above problems, the object of the present invention is made of a simple structure and injection compression that can reduce the manufacturing cost of the injection compression molding apparatus by using the existing injection compression molding apparatus as it is The present invention provides a mold apparatus for a mold.

In addition, the present invention is to provide an injection compression mold apparatus and an injection compression molding method using the same that can simplify the injection molding process to increase the productivity by reducing the tack time (Tact time).

In addition, the present invention provides an injection compression mold apparatus and an injection compression molding method using the same, which can increase productivity by allowing the gate portion to be automatically separated without compression.

In order to achieve the object of the present invention as described above, the present invention is disposed in a position facing the first pressing portion, the first mold installed in the first pressing portion, the first pressing portion is moved by the drive means. A second mold part, a second mold part provided at the second pressing part and disposed at a position facing the first mold part, and positioned at one side of the second mold part and installed on the second pressing part part of one surface of the first mold part; Filling a resin into a cavity maintained in close contact with the gap holding member, a support portion for pushing the gap holding member toward the first mold side, and a cavity provided to the first mold to make the first mold and the second mold join each other; It includes a resin injecting portion having an injection hole,

An injection compression mold apparatus for cutting a gate by the first mold and the second mold in the process of compressing the resin filled in the cavity by bringing the first mold and the second mold into close contact with each other.

The first mold is provided with a first cut edge, the second mold is provided with a second cut edge corresponding to the first cut edge, and the cavity is brought into close contact with the first mold and the second mold. In the process of compressing the resin accommodated therein, the gate may be cut while the first cut edge portion and the second cut edge portion cross each other.

The first cutting edge may be provided at an injection hole surface forming the same surface as the injection hole and an inner wall surface of the cavity so that the injection hole surface and the inner wall surface of the cavity meet the first mold.

The second cutting edge may be provided at a portion where the pressing surface facing the cavity and the side surface of the pressing surface face the second mold so that the side of the pressing surface and the pressing surface meet.

The first mold is provided with an injection hole surface forming the same surface as the injection hole, a dam portion protruding from the injection hole surface is provided, and the gap maintaining member is provided with an extension portion extending from one side thereof, and the dam portion and one surface of the extension portion are provided. The close contact may form a passage for filling the resin into the cavity at the injection hole.

The extension portion may be provided with a surface facing the second mold, and the surface facing the second mold may be in close contact with a side of the pressing surface provided in the second mold.

The support part may be made of an elastic member or a hydraulic or pneumatic actuator.

The first pressing portion and the second pressing portion maintain a resin compression interval in a state of injecting resin into the cavity through the resin injecting portion, and a space is provided on a side surface of the pressing surface of the second mold, and the first mold The distance formed by the space with respect to the moving direction may be greater than or equal to the resin compression interval.

In addition, the present invention comprises the steps of forming a cavity by combining the first mold and the second mold separated from each other, filling the resin into the cavity by a resin injection portion after the step of forming the cavity, filling the resin in the cavity After the step, the first mold and the second mold is in close contact with each other to compress the resin filled in the cavity, the compression and gate cutting step of cutting the gate in the process of compressing the resin, the molded article after the compression and gate cutting step Cooling or hardening the step, and after the cooling or curing step, separating the first mold and the second mold to separate the molded article from the cavity provides an injection compression molding method using an injection compression mold apparatus. do.

In the compression and gate cutting step, the gate may be cut by the first mold and the second mold while the resin is compressed by the first mold and the second mold.

In the compression and gate cutting step, the gate may be cut while the first cutting edge portion provided in the first mold and the second cutting edge portion provided in the second mold cross each other.

Without the addition of the gate cutting device as described above of the present invention by compressing the resin filled in the cavity with the first mold and the second mold and at the same time provide a structure that can cut the gate with the first mold and the second mold Although it is made of a simple structure, the existing injection compression molding apparatus can be used as it is, it has the effect of reducing the production cost of the injection compression molding apparatus.

The present invention can cut the gate in the process of compressing the resin contained in the cavity with the first mold and the second mold, so that the compression process and the gate cutting process are performed at the same time, thereby reducing the tack time of the injection compression molding process to increase productivity. Has the effect.

In addition, the present invention can increase the productivity by automatically separating the gate without applying a compressive force for injection compression molding to the gate portion.

1 is a view showing the external shape of the injection molding die apparatus for explaining an embodiment of the present invention.
2 is a cross-sectional view taken along line II-II of FIG.
3 is a view showing the main part of FIG.
4 is a view showing a state in which a resin is injected into the cavity to explain an embodiment of the present invention.
5 is a view showing a state in which the gate is cut during the compression process of the cavity to explain an embodiment of the present invention.
6 is a view for explaining a process in which the product is separated to explain an embodiment of the present invention.
Figure 7 is a flow chart for explaining the injection compression molding method for explaining an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

FIG. 1 is a perspective view for explaining an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a section II-II of FIG. 1, illustrating a mold apparatus for injection compression molding.

The injection compression mold apparatus according to the embodiment of the present invention includes a first pressing part 1, a first mold 3, a second pressing part 5, a second mold 7, a resin injecting part 9, and a gap keeping. Member 11 and support 13.

And the injection compression mold apparatus according to the embodiment of the present invention, the controller (C) for controlling the actuator 15, the drive means such as the actuator 15 for providing a compressive force to the first mold 3 and the second mold (7) And it may include a resin supply device (I) for supplying a resin to the resin injection portion (9).

The first pressing portion 1 is a kind of frame that can fix the first mold 3. The first pressing portion 1 can be kept fixed without moving. And the 2nd press part 5 is a kind of frame which can fix the 2nd metal mold | die 7. The second pressing portion 5 may move toward the first pressing portion 1 by a driving means such as the actuator 15.

The first pressing portion 1 is provided with a first contact surface 1a facing the second pressing portion 5. In addition, the second pressing portion 5 is provided with a second contact surface 5a that can be in close contact with the first contact surface 1a of the first pressing portion 1. The first contact surface 1a may be provided along the side side of the first pressing part 1. The second contact surface 5a may also be provided along the side of the second pressing part 5. The first contact surface 1a and the second contact surface 5a may maintain a constant distance or may be in close contact with each other.

In the embodiment of the present invention, as an example, the first pressing unit 1 is fixed, and the second pressing unit 5 will be described as an example of moving.

The second pressing part 5 may be coupled to the actuator 15 to move toward the first pressing part 1. The actuator 15 may have a cylinder CY and a piston rod R operated by hydraulic pressure. That is, the piston rod (R) actuated by hydraulic pressure is coupled to one side of the first pressurizing portion (1), and the second pressurizing portion (5) is moved to the first pressurizing portion (1) by the movement of the piston rod (R). ) Can be moved to the side. The controller C may control the moving distance of the actuator 15 described above.

The embodiment of the present invention shows an example of a driving means in which the actuator 15 is composed of a hydraulic actuator operated by hydraulic pressure, but the present invention is not limited thereto, and the second pressing unit 5 is not limited thereto. 1) If it can move to the side may be applied to other drive means.

When the first mold 3 and the second mold 7 are joined to face each other, a cavity 17 of a product shape, which is made by injection compression molding, is made. An embodiment of the present invention will be described by showing an example in which the cavity 17 is provided in the first mold 3 as an example.

The first mold 3 is provided with a cavity 17 in a partially open form, and the second mold 7 has a pressing surface capable of closing the opened portion of the cavity 17 of the first mold 3. 7a is provided. That is, the pressing surface 7a of the second mold is accommodated in the cavity 17 of the first mold 3 to form a closed cavity 17.

The resin injecting unit 9 into which the resin supplied by the resin supply device I flows may be provided in the first pressing unit 1 and the first mold 3. The resin injecting unit 9 can supply resin to the cavity 17.

In addition, the second pressing part 5 is provided with a space keeping member 11 at one side where the second mold 7 is disposed. In addition, the second pressing part 5 is provided with a supporting part 13 for supporting the space keeping member 11.

It is preferable that a part of the gap holding member 11 protrudes from the second contact surface 5a of the second pressing part 5 toward the first mold 3 side. That is, the gap maintaining member 11 may be supported by the support 13 to be in close contact with a portion of the first mold 3.

The gap holding member 11 forms a cavity 17 by combining the first mold 3 and the second mold 7, and injects resin into the cavity 17 through the resin injection part 9. When in a possible state, it serves to keep the distance between the first contact surface 1a of the first pressing part 1 and the second contact surface 5a of the second pressing part 5 constant. When the resin 17 can be injected into the cavity 17 through the resin injecting unit 9, the second contact surface of the first contact surface 1a of the first press section 1 and the second press section 5 is provided. The interval of 5a will be referred to as the resin compression interval t1 (shown in FIG. 2).

That is, the gap holding member 11 is supported by the support 13 to protrude from the second contact surface 5a of the second pressing part 5 to serve to maintain the resin compression interval t1.

The support 13 may be made of an elastic member such as a compression coil spring, and may be made of a hydraulic actuator controlled by the controller C.

On the other hand, the above-mentioned 1st metal mold | die 3 is provided with the wall part 3a in the part which surrounds the cavity 17. As shown in FIG. In other words, the wall portion 3a has a constant height to form the cavity 17. In addition, grooves 3b (shown in FIGS. 1 and 3) may be dug into a portion of the wall portion 3a. As shown in FIG. 3, the groove 3b is provided with an injection hole 9a which is an end of the resin injection portion 9 described above. The groove 3b is provided with an injection hole surface 3c forming the same plane as the injection portion 9a. And the outer side of this injection port surface 3c is provided with the dam part 3d formed lower than the height of the wall part 3a mentioned above. That is, the dam part 3d can be made into the surface higher than the injection port surface 3c (shown in FIG. 3).

On the other hand, as shown in Figures 1 to 3, the interval holding member 11 is provided with an extension portion (11a) on one side. The extension part 11a may be fitted into the groove 3b and disposed in close contact with the dam part 3b. Thus, when the extension part 11a is arrange | positioned in close contact with the dam part 3b, the channel | path 3e (shown in FIG. 3) which can inject resin between the injection port surface 3c and the extension part 11a is provided. Form.

The extension part 11a may be in close contact with the side of the pressing surface 7a of the second mold 7 whose surface facing the second mold 7 is extended. As for the side surface 7b of the press surface 7a of the 2nd metal mold | die 7, it is preferable that the constant space 7c is provided. It is preferable that the side surface 7b of the pressing surface 7a of the second die 7 is made perpendicular to the pressing surface 7a.

The extension part 11a of this space holding member 11 arrange | positioned in the space 7c (shown in FIG. 2) provided in the side surface 7b of the pressing surface 7a of the 2nd metal mold | die 7, and this extension part It is preferable that the distance t2 with the 2nd metal mold | die 7 which 11a faces is larger than or equal to the above-mentioned resin compression space | interval t1.

On the other hand, the first die 3 is provided with a first cut edge 3f, and the second die 7 is provided with a second cut edge 7d corresponding to the first cut edge 3f. .

The first cutting edge 3f and the second cutting edge 7d may be a process of compressing the resin filled in the cavity 17 by bringing the first mold 3 and the second mold 7 into close contact with each other. At the second cutting edge 7d can pass the first cutting edge 3f to a position corresponding to the thickness of the product while cutting the gate 19 that can be made by the passage 3e described above. have.

The first cut edge 3f may be provided at a portion where the injection port surface 3c of the first mold 3 and the inner wall surface of the cavity 17 meet. In addition, the second cutting edge 7d may be provided at a portion where the pressing surface 7a of the second die 7 meets the side surface 7b of the pressing surface 7a.

On the other hand, the height t3 (shown in FIG. 2) from the first cut edge portion 3f provided to the first mold 3 to the bottom surface of the cavity 17 provided to the first mold 3 is a product. Is the thickness.

The operation of the embodiment of the present invention will be described in detail as follows.

 First, the actuator 15 which is a driving means is driven by the control of the controller C in the state which the 1st press part 1 and the 2nd press part 5 are separated. The rod R of the actuator 15 moves to move the second press section 5 to the first press section 1 side. 2 and 4, the space keeping member 11 presses the first mold 7 to balance the force while maintaining the resin compression interval t1.

At this time, the first mold 3 and the second mold 7 are coupled to each other to form a cavity 17 (states shown in S1 and FIG. 4 of FIG. 7). And resin is supplied to the resin injecting part 9 by the resin supply apparatus I. The resin supplied to the resin injecting portion 9 is filled in the cavity 17 through a passage 3e formed by the first mold 3 and the extension portion 11a of the gap holding member 11 through the inlet 9a. (S3 of FIG. 7).

When the resin is filled in the cavity 17, the controller C controls the actuator 15 to move the second pressing part 5 to the first pressing part 1 side. Then, the 2nd press part 5 moves to the 1st press part 1 side. At the same time, the resin filled in the cavity 17 is compressed while the second mold 7 moves toward the first mold 3 side. At this time, the first mold 3 pushes the gap holding member 11 by pushing. And the 1st contact surface 1a of the 1st press part 1 and the contact surface 5a of the 2nd press part 5 contact each other. That is, the resin compression interval t1 can be eliminated or minimized.

As the second die 7 moves toward the first die 3, the second cut edge 7d of the second die 7 passes past the first cut edge 3f of the first die 3. Move to the position corresponding to the thickness of the product. At this time, the gates 19 (shown in FIG. 4) made by the passages 3e are the first cut edges 3f of the first die 3 and the second cut edges of the second die 7 ( 7d) (shown in S5 of FIG. 7 and FIG. 5).

In this state, the resin filled in the cavity 17 is compressed by the first mold 3 and the second mold 7, but the gate 19 is not compressed. Therefore, the embodiment of the present invention can produce a product by compressing only the resin filled in the cavity 17.

Subsequently, the resin contained in the cavity 17 is cooled or cured (S7 in FIG. 7). And the controller C controls the actuator 15 so that the 2nd press part 5 may be isolate | separated from the 1st press part 1 (S9 of FIG. 7). Then, as shown in FIG. 6, the first mold 3 and the second mold 7 may be separated from each other to separate the injection compression molded product P. Referring to FIG.

As described above, in the embodiment of the present invention, the gate 19 may be cut in the process of pressing the second mold 7 to the first mold 3, thereby reducing work time and improving productivity.

In addition, the embodiment of the present invention provides a structure in which the gate 19 can be cut using the first mold 3 and the second mold 7, so that a separate gate cutting device is not required. The cost of manufacturing the injection molding die apparatus can be reduced.

In addition, since the embodiment of the present invention provides a structure for cutting the gate 19 by using the first mold 3 and the second mold 7, the existing injection compression molding apparatus can be used as it is, thereby reducing the manufacturing cost. have.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

1. First press section, 1a. First contact surface,
3. 1st mold, 3a, wall part,
3b. Home, 3c. Injection Sphere,
3d. Dam section, 3e. Passage,
3f. The first cut-
5. Second press section, 5a. A second contact surface,
7. Second mold, 7a. Pressing Surface,
7b. Side of pressure surface, 7c. space,
7d. Second cutting edge,
9. Resin injection portion, 9a. Inlet,
11. Space keeping member, 11a. Extension,
13. Support, 15. Actuator,
17. Cavity, 19. Gate

Claims (11)

  1. The first pressing portion,
    A first mold installed in the first pressing part,
    A second pressing portion disposed at a position facing the first pressing portion and moving toward the first pressing portion by the driving means,
    A second mold provided on the second pressing part and disposed at a position facing the first mold;
    A spacing member disposed on one side of the second mold and installed on the second pressing part to be in close contact with one surface of the first mold;
    A support part for pushing the gap holding member toward the first mold;
    And a resin injecting part provided in the first mold and having an injection hole filling the cavity formed by combining the first mold and the second mold with each other.
    The gate is cut by the first mold and the second mold in a process of compressing the resin filled in the cavity by bringing the first mold and the second mold into close contact with each other.
    In the first mold
    An injection hole surface forming the same surface as the injection hole is provided, and a dam portion protruding from the injection hole surface is provided,
    The gap maintaining member is provided with an extension portion extending from one side,
    One side of the dam portion and the extension portion is in close contact with the injection molding die apparatus for forming a passage for filling the resin into the cavity.
  2. The method according to claim 1,
    In the first mold
    A first cut edge portion is provided,
    In the second mold,
    A second cutting edge portion corresponding to the first cutting edge portion is provided,
    The first compression mold and the second mold in close contact with each other in the process of compressing the resin accommodated in the cavity, the first cutting edge portion and the second cutting edge portion in the injection compression molding die apparatus for cutting the gate.
  3. The method according to claim 2,
    The first cutting edge portion
    Injection molding apparatus for injection compression molding is provided in the injection mold surface and the inner wall surface of the cavity formed in the same surface as the injection hole in the first mold and the injection hole surface and the inner wall surface of the cavity.
  4. The method according to claim 2,
    The second cutting edge portion
    Injection mold apparatus for injection compression molding is provided in the second mold is provided with a pressing surface facing the cavity and the side of the pressing surface is the portion where the side of the pressing surface and the pressing surface meet.
  5. delete
  6. The method according to claim 1,
    The extension part
    A surface facing the second mold is provided,
    The surface facing the second mold of the extension portion
    Injection compression molding mold apparatus in close contact with the side of the pressing surface provided in the second mold.
  7. The method according to claim 1,
    The support
    An injection mold for injection compression molding comprising an elastic member or oil and a pneumatic actuator.
  8. The method according to claim 1,
    The first pressing portion and the second pressing portion
    A resin compression space is maintained in a state where resin is injected into the cavity through the resin injection unit,
    A space is provided on a side surface of the pressing surface of the second mold,
    An injection compression mold apparatus according to the direction in which the first mold moves, the distance made by the space is greater than or equal to the resin compression interval.
  9. delete
  10. delete
  11. delete
KR1020100097900A 2010-10-07 2010-10-07 Molding device for injection compression molding and method using the same KR101384323B1 (en)

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Application Number Priority Date Filing Date Title
KR1020100097900A KR101384323B1 (en) 2010-10-07 2010-10-07 Molding device for injection compression molding and method using the same
JP2010264967A JP5184614B2 (en) 2010-10-07 2010-11-29 Mold apparatus for injection compression molding and injection compression molding method using the same
TW099141897A TWI443007B (en) 2010-10-07 2010-12-02 Molding device for injection compression molding and method using the same
CN201010591394.4A CN102441970B (en) 2010-10-07 2010-12-13 Molding device for injection compression molding and method using the same

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KR101384323B1 true KR101384323B1 (en) 2014-04-10

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JP5851379B2 (en) * 2012-10-26 2016-02-03 小島プレス工業株式会社 Injection compression mold

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KR20110005048A (en) * 2009-07-09 2011-01-17 주식회사 엘지화학 Mold for effective control of injection-compression molding

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