KR20120029599A - Injection mold apparatus and manufacturing method for foam resin product - Google Patents

Injection mold apparatus and manufacturing method for foam resin product Download PDF

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Publication number
KR20120029599A
KR20120029599A KR1020100091491A KR20100091491A KR20120029599A KR 20120029599 A KR20120029599 A KR 20120029599A KR 1020100091491 A KR1020100091491 A KR 1020100091491A KR 20100091491 A KR20100091491 A KR 20100091491A KR 20120029599 A KR20120029599 A KR 20120029599A
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KR
South Korea
Prior art keywords
mold
injection
molten resin
resin
cavity
Prior art date
Application number
KR1020100091491A
Other languages
Korean (ko)
Inventor
김학도
Original Assignee
삼성전자주식회사
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Publication date
Application filed by 삼성전자주식회사 filed Critical 삼성전자주식회사
Priority to KR1020100091491A priority Critical patent/KR20120029599A/en
Publication of KR20120029599A publication Critical patent/KR20120029599A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE: An injection molding device and a method of manufacturing foam resin products are provided to prevent a weld line from becoming formed since while melted resin and gas are injected, first and second molds are maintained at over a heat deflection temperature of the melted resin through a heating unit. CONSTITUTION: An injection molding device(10) comprises first and second molds(11,12), an injection unit(14), and a heating unit(15). The second mold surface(12a) of the second mold forms a cavity(13) with the first mold surface(11a) of the first mold. The injecting unit injects melted resin(R) and gas into the cavity in a mixed gel state. The heating unit heats melted resin injected into the cavity to maintain melted resin at over a heat deflection temperature.

Description

Injection Molding Device and Manufacturing Method of Foam Resin Products {INJECTION MOLD APPARATUS AND MANUFACTURING METHOD FOR FOAM RESIN PRODUCT}

The present invention relates to an injection mold apparatus for producing a foamed resin product.

In general, an injection mold apparatus is an apparatus for manufacturing a resin product in a form corresponding to a cavity of a mold by injecting molten resin into the mold.

The injection mold apparatus includes a first mold and a second mold coupled to each other and provided with a cavity having a shape corresponding to the shape of the product to be manufactured therebetween, and an injection apparatus for injecting molten resin into the cavity. The molten resin is injected into the cavity, and the molten resin injected into the cavity is cooled to solidify, thereby producing a resin product having a shape corresponding to the cavity.

Among such injection mold apparatuses, there is an injection mold apparatus for manufacturing a foamed resin product by allowing a molten resin to be foamed in a cavity.

The present invention relates to an injection mold apparatus capable of manufacturing a foamed resin product of the present invention and a method of manufacturing a foamed resin product through the same.

According to an aspect of the present invention, an injection mold apparatus includes a first mold having a first mold surface, a second mold having a second mold surface for forming a cavity together with the first mold surface, and a molten resin and a gas mixed with each other. And an injection mold apparatus including an injection apparatus for injecting into the cavity in a gel state, and a heating apparatus for maintaining the molten resin injected into the cavity at or above its heat deflection temperature.

The apparatus further includes a cooling device for cooling the molten resin in the cavity.

The heating apparatus also heats the first mold and the second mold so that the first mold and the second mold are maintained above the heat deflection temperature of the molten resin while the molten resin is injected into the cavity.

The cooling apparatus also cools the first mold and the second mold after the injection of the molten resin into the cavity is completed.

The injection apparatus also heats the resin in the solid state and the blowing agent supplied into the injection apparatus to melt the resin and vaporize the blowing agent with gas.

In addition, the method of manufacturing a water-repellent resin product according to an aspect of the present invention supplies the resin and the blowing agent to the injection device, by applying heat to the resin and the blowing agent supplied in the injection device to melt the resin and vaporize the blowing agent into a gas, The molten resin and the gas are injected into the cavity formed between the first mold and the second mold in a gel state mixed with each other, and the first mold and the second mold are melted by a heating device while the molten resin and the gas are injected into the cavity. Heat above the heat distortion temperature of resin.

Also, after the injection of the molten resin and the gas is completed, the first mold and the second mold are cooled by the cooling apparatus.

As described above, while the molten resin and the gas are injected, the first mold and the second mold are maintained at or above the heat deformation temperature of the molten resin through the heating apparatus, so that the transfer from the first mold surface and the second mold surface of the molten resin is performed. The improved properties and the formation of weld lines can be prevented to produce a foamed resin product having a glossy surface.

1 is a schematic view of an injection mold apparatus according to an embodiment of the present invention.
2 is a schematic view of an injection mold apparatus according to an embodiment of the present invention, which shows a process in which molten resin and gas are injected.
3 is a partially enlarged view of a product manufactured by an injection mold apparatus according to an embodiment of the present invention.

Hereinafter will be described in detail with reference to the injection mold apparatus and a foamed resin product manufacturing method through the same according to an embodiment of the present invention.

As shown in FIG. 1, the injection mold apparatus 10 according to the exemplary embodiment of the present invention is coupled to the first mold 11 and the first mold 11 having the first mold surface 11a and coupled to the first mold 11. It is formed by the 2nd metal mold | die 12 provided with the 2nd metal mold surface 12a which forms the cavity 13 with the metal mold surface 11a, and the 1st metal mold surface 11a and the 2nd metal mold surface 12a. An injection device 14 for injecting molten resin into the cavity 13 is included.

The injection device 14 is formed in a solid state and is formed in the form of resin (R) and pellets or powder which are melted by heat, and is supplied with a blowing agent (F) vaporized into a gas by heat. The supplied resin and the blowing agent are heated in the injection device 14, so that the resin is melted and the blowing agent is vaporized into a gas so that the molten resin and the gas in the injection device 14 are transformed into a mixture of gels mixed with each other. The molten resin and the gas are injected into the cavity 13 by the injection device 14 in a gel state mixed with each other.

In addition, the injection mold apparatus 10 heats the first mold and the second mold 12 above the heat deformation temperature of the molten resin to prevent the molten resin from solidifying in the process of injecting the molten resin and the gas into the cavity 13. The heating device 15 for improving the flowability of the molten resin and the first mold 11 and the second mold 12 are cooled after the injection of the molten resin and the gas is completed to cool the first mold surface 11a and the second mold. It includes a cooling device 16 to allow the molten resin adjacent to the face 12a to be rapidly cooled.

The following describes a foamed resin product manufacturing method by the injection mold apparatus 10 configured as described above.

First, the resin and the blowing agent are supplied to the injection apparatus 14, and the resin and the blowing agent supplied to the injection apparatus 14 are heated in the injection apparatus. Since the resin is heated to melt and the blowing agent is heated and vaporized into a gas, in the injection apparatus 14, the molten resin and the gas are transformed into a mixture of gel states mixed with each other.

The injection apparatus 14 injects the mixture of the gel state which mixed molten resin and gas into the cavity 13 as shown in FIG. The molten resin injected into the cavity 13 is foamed by the gas injected together. At this time, the molten resin and the gas form a cell of uniform density in the cavity 13 by the injection pressure.

As such, in the process of injecting the molten resin and the gas into the cavity 13 by the injection device 14, the heating device 15 is configured to maintain the first mold 11 and the second mold at a temperature higher than the heat deformation temperature of the resin. The first mold and the second mold are heated. Accordingly, the molten resin remains unsolidified until the injection of the molten resin and the gas is completed, thereby improving the transferability of the molten resin on the first mold surface 11a and the second mold surface 12a. This prevents the generation of weld lines and enables the production of foamed resin products having a glossy surface.

After the injection of the molten resin is completed, the heating by the heating device 15 is stopped, and the cooling device 16 operates to rapidly cool the first mold 11 and the second mold 12. In this way, when the first mold 11 and the second mold 12 are rapidly cooled, the molten resin adjacent to the first mold surface 11a and the second mold surface 12a solidifies quickly and, accordingly, the first mold 11 and the second mold 12 are solidified. The molten resin adjacent to the mold surface 11a and the second mold surface 12a is solidified in a state in which foaming by gas is not performed.

Accordingly, as shown in FIG. 3, in the case of the foamed resin product P manufactured by the injection mold apparatus 10 described above, the inside is foamed to have a rough structure, while the surface side portion thereof is not foamed so that it is relatively dense. Having a structure, the injection mold apparatus 10 can produce the foamed resin product P having a higher gloss surface through the cooling device 16.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

10: injection mold apparatus 10a: cavity
11: first mold 11a: first mold surface
12: second mold 12a: second mold surface
13: Cavity 14: Injection Device
15: heater 16: chiller

Claims (7)

A first mold provided with a first mold surface,
A second mold provided with a second mold surface for forming a cavity together with the first mold surface;
An injection apparatus for injecting molten resin and gas into the cavity in a mixed gel state;
And an injection mold apparatus including a heating apparatus to maintain the molten resin injected into the cavity at a temperature higher than its heat deflection temperature. The method of claim 1,
Injection mold apparatus further comprises a cooling device for cooling the molten resin in the cavity. The method of claim 1,
The heating apparatus is an injection mold apparatus for heating the first mold and the second mold so that the first mold and the second mold are maintained above the heat deformation temperature of the molten resin while the molten resin is injected into the cavity. The method of claim 2,
The cooling apparatus is an injection mold apparatus for cooling the first mold and the second mold after the injection of molten resin into the cavity is completed. The method of claim 1,
The injection apparatus is an injection mold apparatus for heating a solid resin and a blowing agent supplied into the injection apparatus to melt the resin and vaporize the blowing agent with a gas. Supply resin and blowing agent to the injection device,
Heat is applied to the resin and the blowing agent supplied in the injection apparatus to melt the resin and vaporize the blowing agent into a gas,
Injecting the molten resin and the gas through the injection machine into the cavity formed between the first mold and the second mold in a gel state mixed with each other,
A method of producing a foamed resin product, wherein a molten resin and a gas are heated to a temperature higher than the heat deformation temperature of the molten resin by a heating device in a process of injecting the molten resin and a gas into the cavity. The method according to claim 6,
And after the injection of the molten resin and the gas is completed, cooling the first mold and the second mold through a cooling device.
KR1020100091491A 2010-09-17 2010-09-17 Injection mold apparatus and manufacturing method for foam resin product KR20120029599A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100091491A KR20120029599A (en) 2010-09-17 2010-09-17 Injection mold apparatus and manufacturing method for foam resin product

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100091491A KR20120029599A (en) 2010-09-17 2010-09-17 Injection mold apparatus and manufacturing method for foam resin product

Publications (1)

Publication Number Publication Date
KR20120029599A true KR20120029599A (en) 2012-03-27

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103568232A (en) * 2013-10-31 2014-02-12 浙江工业大学 External gas-assisted rapid mould temperature variable injection mould
KR20170001968A (en) 2015-06-29 2017-01-06 엠티코리아 주식회사 partial foam-injection and foam-injection molding mold
KR20190031118A (en) 2017-09-15 2019-03-25 강명호 Foam Molding Machine And Foam Molding Method Thereby
WO2021029594A1 (en) 2019-08-13 2021-02-18 강명호 Foam molding apparatus and foam molding method thereby

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103568232A (en) * 2013-10-31 2014-02-12 浙江工业大学 External gas-assisted rapid mould temperature variable injection mould
CN103568232B (en) * 2013-10-31 2015-12-30 浙江工业大学 The rapid mould temperature variable injection mould that a kind of extraneous gas is auxiliary
KR20170001968A (en) 2015-06-29 2017-01-06 엠티코리아 주식회사 partial foam-injection and foam-injection molding mold
KR20190031118A (en) 2017-09-15 2019-03-25 강명호 Foam Molding Machine And Foam Molding Method Thereby
WO2021029594A1 (en) 2019-08-13 2021-02-18 강명호 Foam molding apparatus and foam molding method thereby
KR102218682B1 (en) 2019-08-13 2021-02-22 강명호 Foam Molding Machine And Foam Molding Method Thereby

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