KR20080029163A - Foaming apparatus and method having multi-layers of different magnifying ratio - Google Patents

Foaming apparatus and method having multi-layers of different magnifying ratio Download PDF

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KR20080029163A
KR20080029163A KR1020060094827A KR20060094827A KR20080029163A KR 20080029163 A KR20080029163 A KR 20080029163A KR 1020060094827 A KR1020060094827 A KR 1020060094827A KR 20060094827 A KR20060094827 A KR 20060094827A KR 20080029163 A KR20080029163 A KR 20080029163A
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South Korea
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pressure air
high pressure
mold
discharge hole
molding apparatus
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KR1020060094827A
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Korean (ko)
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KR101278133B1 (en
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신동원
최원준
김남형
오은택
조희안
소철원
길용길
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한화엘앤씨 주식회사
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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
    • B29C44/04—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0461—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other
    • B29C44/0469—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other provided with physical separators between the different materials, e.g. separating layers, mould walls
    • 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
    • B29C44/34—Auxiliary operations
    • B29C44/3403—Foaming under special conditions, e.g. in sub-atmospheric pressure, in or on a liquid
    • 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
    • B29C44/34—Auxiliary operations
    • B29C44/58—Moulds
    • B29C44/588—Moulds with means for venting, e.g. releasing foaming gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3044—Bumpers

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  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

A foaming apparatus and a method having multi-layers of a different magnifying ratio are provided to improve the strength at a boundary because there is no gap at the boundary as compared with a boundary formed by a separator. A fixture cavity is formed with a high-pressure air injection hole(12) used to inject high-pressure air such that an air curtain(18) is formed inside a mold. A movement core is formed with a high-pressure air discharge hole(22) used to discharge the high-pressure air injected through the high-pressure air injection hole. Guide grooves have a thread shape. The guide grooves are formed from the high-pressure air injection hole to the high-pressure air discharge hole in the fixture cavity and the movement core. The high-pressure air discharge hole has a plurality of slits.

Description

이종배율 발포 성형장치 및 방법{Foaming apparatus and method having multi-layers of different magnifying ratio}Foaming apparatus and method having multi-scale expansion molding

도1 및 도2는 종래의 방법에 의한 이종배율 발포 성형방법을 설명하기 위한 도면;1 and 2 are views for explaining a heterogeneous expansion molding method according to a conventional method;

도3은 본 발명의 이종배율 발포 성형방법에 의한 이종배율 발포 성형체를 제조하기 위한 장치의 구성을 개념적으로 나타낸 도면;3 is a view conceptually showing the configuration of an apparatus for manufacturing a heterogeneous expansion molded article according to the heterogeneous expansion molded molding method of the present invention;

도4는 본 발명의 장치를 이루는 고정측 캐비티와 이동측 코어의 내면에 형성된 가이드홈의 형상을 나타낸 도면;Figure 4 is a view showing the shape of the guide groove formed on the inner surface of the fixed side cavity and the moving side core constituting the device of the present invention;

도5 내지 도7은 본 발명의 장치를 이루는 이동측 코어의 고압공기 배출구멍에 대한 다양한 실시예를 나타낸 도면이다.5 to 7 show various embodiments of the high-pressure air outlet holes of the moving side core forming the apparatus of the present invention.

※도면의 주요부분에 대한 부호의 설명※※ Explanation of symbols about main part of drawing ※

10 : 캐비티10: cavity

11, 21 : 가이드홈11, 21: guide groove

12 : 고압공기 분사구멍12: high pressure air injection hole

20 : 코어20: core

22 : 고압공기 배출구멍22: high pressure air discharge hole

26 : 대경부26: Dae Kyungbu

27 : 소경부27: small diameter part

본 발명은 이종배율 발포 성형장치 및 방법에 관한 것으로서, 특히 에어커튼에 의해 형성된 경계를 기준으로 이종 배율의 발포가 이루어지는 이종배율 발포 성형장치 및 방법에 관한 것이다.TECHNICAL FIELD The present invention relates to heterogeneous foam molding apparatus and method, and more particularly, to a heterogeneous foam molding apparatus and method in which heterofoam foaming is performed based on a boundary formed by an air curtain.

이종배율 발포 성형체는, 예컨대 자동차의 앞, 위쪽에 설치되는 범퍼커버와 지지빔 사이의 업소버에 적용되며, 상대적으로 저밀도를 갖는 부위와 상대적으로 고밀도를 갖는 부위가 일체로 형성된 구성을 갖는다.The hetero magnification foam molded article is applied to, for example, an absorber between a bumper cover and a support beam installed at the front and top of a vehicle, and has a structure in which a portion having a relatively low density and a portion having a relatively high density are integrally formed.

이러한 이종배율 발포 성형체를 제조하기 위한 다양한 방법이 알려져 있다.Various methods for producing such hetero magnification foam molded articles are known.

가장 기본적인 방법은, 다른 밀도를 갖도록 성형된 제품을 접착이나 용융에 의해 서로 고정시키는 기술이다.The most basic method is a technique for fixing products molded to different densities by bonding or melting.

그러나, 이 기술은 접착이나 용융을 위한 별도의 공정이 필요하여 제품 단가를 상승시키는 요인이 되는 것은 물론, 제품의 품질이 열악한 단점을 갖는다.However, this technique requires a separate process for adhesion or melting, which not only increases the cost of the product but also has a disadvantage of poor product quality.

다른 방법으로서, 일본국 특개평 1-257018호에는 발포특성이 다른 복수의 수지를 동시에 다른 사출공에서 성형금형으로 사출하여 성형하는 기술이 제시되어 있다.As another method, Japanese Patent Application Laid-Open No. 1-257018 discloses a technique of molding a plurality of resins having different foaming properties by simultaneously injecting them into molding molds in different injection holes.

그러나, 이 기술은 발포특성이 다른 복수의 수지 사이의 경계부가 명확하게 형성되지 않을 뿐만 아니라 그 경계부의 위치가 매우 가변적이어서 표준화된 제품 의 제조가 곤란하다는 단점을 갖는다.However, this technique has the disadvantage that not only the boundary between a plurality of resins having different foaming properties is clearly formed, but also the position of the boundary is very variable, making it difficult to manufacture a standardized product.

또 다른 방법으로서, 일본국 특개평 11-334501 및 미국특허 5,252,270호 등에는 실린더(4) 등의 기구에 의해 작동되는 격벽(5)에 의해 발포특성이 다른 복수의 수지 사이의 경계부를 형성하는 기술이 제시되어 있다. 상기 격벽(5)은 판재 모양을 이루거나, 핀이 일정 간격 떨어진 모양을 가질 수 있다.As another method, Japanese Patent Laid-Open Nos. 11-334501 and US Pat. No. 5,252,270 disclose a technique for forming a boundary between a plurality of resins having different foaming characteristics by the partition wall 5 operated by a mechanism such as a cylinder 4. Is presented. The partition 5 may have a shape of a plate or may have a shape in which pins are spaced apart from each other.

이러한 기술은 크게 두 가지 형태로 분류되며, 첫 번째 형태는 도1에 도시된 것처럼, 이종밀도의 원재료를 갖는 2개의 압력충진호퍼(1)(2)가 구비된 구성의 것이며, 두 번째 형태는 도2에 도시된 것처럼, 한 종류의 원재료를 갖는 하나의 압력충진호퍼(3)가 구비된 구성의 것이다. 그리고, 후자의 형태를 갖는 구성에서는 첫 번째 충진시 모든 챔버의 인젝터가 열린 상태이며, 두 번째 충진시 낮은 밀도를 갖는 챔버의 인젝터가 닫힌 상태로 유지되게 함으로써 이종배율 발포 성형체의 제조가 이루어진다.This technique is largely classified into two types, and the first type is composed of two pressure filling hoppers (1) and (2) having raw materials of different densities, as shown in FIG. As shown in Fig. 2, one pressure filling hopper 3 having one kind of raw material is provided. In the latter configuration, the injectors of all the chambers are open at the first filling, and the injector of the chambers having the lower density is kept closed at the second filling, thereby producing a heterogeneous foam molded article.

그러나, 격벽(5)을 이용하여 발포특성이 다른 복수의 수지 사이의 경계부를 형성하는 상기의 기술은, 실린더 등의 기구가 금형에 설치되어 금형의 전체 구조가 복잡해지고, 특히 성형시 접착계면이 취약한 단점을 갖는다.However, in the above technique of forming a boundary between a plurality of resins having different foaming characteristics by using the partition wall 5, a mechanism such as a cylinder is installed in the mold, which complicates the overall structure of the mold, and in particular, an adhesive interface during molding. Has a weak disadvantage.

따라서, 본 발명은 상기한 종래의 문제점을 해결하기 위한 것으로서, 고압의 에어를 분사하여 형성되는 에어커튼을 이용하여 발포특성이 다른 복수의 수지 사이의 경계부를 이루도록 하여 이종배율 발포 성형체를 제조할 수 있는 이종배율 발포 성형장치 및 방법을 제공하는 것을 그 목적으로 한다.Therefore, the present invention is to solve the above-described problems, it is possible to produce a heterogeneous expansion molded article by forming a boundary between a plurality of resins having different foaming characteristics by using an air curtain formed by injecting a high-pressure air. It is an object of the present invention to provide a heterogeneous expansion molding apparatus and method.

상기한 목적을 달성하기 위한 기술적인 구성으로서, 본 발명은, 이종배율 발포용 수지를 금형의 내부로 공급하여 이종배율 발포 성형체를 제조하도록 구성된 이종배율 발포 성형장치로서, 금형의 내부에 에어커튼이 형성되도록 고압공기를 분사하는 고압공기 분사구멍이 형성된 고정측 캐비티와, 상기 고압공기 분사구멍에서 분사된 고압공기가 배출되는 고압공기 배출구멍이 형성된 이동측 코어를 포함하여 구성된 이종배율 발포 성형장치를 특징으로 한다.As a technical configuration for achieving the above object, the present invention is a heterogeneous expansion foam molding apparatus configured to supply heterogeneous foaming resin into a mold to produce a heterogeneous foam molding, wherein an air curtain is formed inside the mold. A heterogeneous expansion molding apparatus comprising a fixed side cavity having a high pressure air injection hole for injecting high pressure air to be formed, and a moving side core having a high pressure air discharge hole for exhausting the high pressure air injected from the high pressure air injection hole. It features.

또한, 본 발명은, 고압공기의 분사에 의해 금형의 내부에 에어커튼을 형성하고 그 에어커튼에 의해 형성된 경계부의 양쪽에 이종배율 발포용 수지를 각각 공급하여 이종배율 발포 성형체를 제조하는 이종배율 발포 성형방법을 특징으로 한다.In addition, the present invention is to form a double-sided foam to form a double-fold foamed molded article by forming an air curtain in the mold by the injection of high-pressure air, respectively supplying the resin for the double-fold expansion foam to both sides of the boundary formed by the air curtain It is characterized by a molding method.

이하, 본 발명의 실시예를 첨부된 도면을 참조하여 보다 상세하게 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도3은 본 발명의 이종배율 발포 성형방법에 의한 이종배율 발포 성형체를 제조하기 위한 장치의 구성을 개념적으로 나타낸 도면이다.3 is a view conceptually showing the configuration of an apparatus for producing a hetero magnification foam molded article by the hetero magnification foam molding method of the present invention.

고정측 캐비티(10)와, 이동측 코어(20)의 사이에 소정의 공간이 형성되며, 이 공간에 발포특성이 다른 복수의 수지를 공급함으로써 이종배율 발포 성형체가 제조된다.A predetermined space is formed between the fixed side cavity 10 and the moving side core 20, and a heterogeneous expansion molded article is produced by supplying a plurality of resins having different foaming characteristics to the space.

상기 고정측 캐비티(10)에는 금형의 내부로 고압공기를 분사하기 위한 고압공기 분사구멍(12)이 형성되며, 이 고압공기 분사구멍(12)에는 각각 밸브(16)가 갖춰진 고압공기 공급관(14)이 연결된다.The fixed side cavity 10 is formed with a high pressure air injection hole 12 for injecting high pressure air into the mold, and each of the high pressure air injection holes 12 is provided with a high pressure air supply pipe 14 equipped with a valve 16. ) Is connected.

그리고, 상기 고압공기 공급관(14)은 미도시된 고압공기 공급원으로부터 고 압공기를 제공받도록 연결된다.In addition, the high pressure air supply pipe 14 is connected to receive high pressure air from a high pressure air supply source (not shown).

상기 이동측 코어(20)에는 상기 고압공기 분사구멍(12)에서 분사된 고압공기를 외부로 배출시키기 위한 고압공기 배출구멍(22)이 형성되며, 이 고압공기 배출구멍(22)은 상기 고압공기 분사구멍(12)에서 분사된 고압공기의 경로 상에 있도록 배치된다.The moving side core 20 is formed with a high-pressure air discharge hole 22 for discharging the high-pressure air injected from the high-pressure air injection hole 12 to the outside, the high-pressure air discharge hole 22 is the high-pressure air It is arranged to be on the path of the high pressure air injected from the injection hole (12).

이러한 고압공기 배출구멍(22)의 크기는 금형 내부로 공급되는 수지의 크기보다 작게 형성되어 수지가 고압공기 배출구멍(22)을 통해 외부로 배출되지 않게 한다.The size of the high pressure air discharge hole 22 is smaller than the size of the resin supplied into the mold to prevent the resin from being discharged to the outside through the high pressure air discharge hole 22.

이와 같이 고압공기 분사구멍(12)을 통해 분사되어 상기 고압공기 배출구멍(22)을 통해 배출되는 고압공기는 금형의 내부에서 발포특성이 다른 복수의 수지 사이의 경계부를 이루는 에어커튼(18)을 형성한다.As such, the high pressure air injected through the high pressure air injection hole 12 and discharged through the high pressure air discharge hole 22 forms an air curtain 18 forming a boundary between a plurality of resins having different foaming characteristics in the mold. Form.

상기 고압공기 분사구멍(12)에서 분사되어 상기 고압공기 배출구멍(22)으로 이동하는 고압공기의 통로를 이루는 상기 고정측 캐비티(10)와 이동측 코어(20)의 내부 표면에는 도4에 도시된 것처럼 나사산 모양의 가이드홈(11)(21)이 형성될 수 있으며, 이러한 가이드홈(11)(21)은 고압공기의 진행 방향을 따라 연속되어 고압공기에 의한 에어커튼의 형성에 도움이 된다.An inner surface of the fixed side cavity 10 and the moving side core 20 which forms the passage of the high pressure air which is injected from the high pressure air injection hole 12 and moves to the high pressure air discharge hole 22 is shown in FIG. Threaded guide grooves 11 and 21 may be formed as shown, and the guide grooves 11 and 21 may be continuous along the advancing direction of the high pressure air to help form the air curtain by the high pressure air. .

물론, 상기에서 고압공기를 분사하는 것으로 설명하고 있지만, 이에 한정하고자 하는 취지는 아니며, 고온증기 등 기타 유체에 의해 에어커튼을 형성하는 것도 본 발명의 범주에 포함됨은 당연하다.Of course, it is described as the injection of high-pressure air, but is not intended to be limited to this, it is natural to form an air curtain by other fluids such as high temperature steam is included in the scope of the present invention.

또한, 상기 고압공기 배출구멍은 다양한 모양으로 형성될 수 있다.In addition, the high pressure air discharge hole may be formed in various shapes.

즉, 도5에 도시된 고압공기 배출구멍(22A)은 여러 개의 슬릿 모양으로 형성되며, 도6에 도시된 고압공기 배출구멍(22B)은 여러 개의 원형 구멍으로 형성되며, 도7에 도시된 고압공기 배출구멍(22C)은 내경의 크기가 상대적으로 크게 형성된 대경부(26)와 내경의 크기가 상대적으로 작게 형성된 소경부(27)로 이루어진다.That is, the high pressure air discharge hole 22A shown in FIG. 5 is formed in a plurality of slit shapes, and the high pressure air discharge hole 22B shown in FIG. 6 is formed of several circular holes, and the high pressure shown in FIG. The air discharge hole 22C includes a large diameter portion 26 having a relatively large internal diameter and a small diameter portion 27 having a relatively small internal diameter.

그리고, 상기 에어커튼(18)에 의해 형성되는 경계부 양쪽에는 각각 발포특성이 다른 복수의 수지가 공급되는 수지공급관(24)(25)이 설치되며, 이 수지공급관(24)(25)은 고정측 캐비티(10) 또는 이동측 코어(20)에 설치된다.In addition, resin supply pipes 24 and 25 are provided on both sides of the boundary formed by the air curtain 18, and the resin supply pipes 24 and 25 are supplied with a plurality of resins having different foaming properties, respectively. It is installed in the cavity 10 or the moving side core 20.

상기 수지공급관(24)(25)은 압력충진호퍼(31)(32)에 연결되어 각각 수지를 공급받는다.The resin supply pipes 24 and 25 are connected to the pressure filling hoppers 31 and 32 to receive resins, respectively.

상기 압력충진호퍼(31)(32)에 충진된 수지는 EPP, EPE, EPS 등으로 이루어지며, 특히 저배율 제품은 충돌시 에너지 흡수력이 높아 자동차 범퍼 코어에 적합하다.The resin filled in the pressure filling hoppers 31 and 32 is made of EPP, EPE, EPS, and the like. In particular, the low magnification product has a high energy absorbing power in a collision and is suitable for an automobile bumper core.

이러한 장치를 이용한 이종배율 발포 성형방법은 다음과 같이 수행될 수 있다.The heterogeneous expansion molding method using such a device may be performed as follows.

전체적인 공정은 금형의 내부로 수지(비드)를 충진하는 단계와, 금형에 충진된 수지를 가열하는 단계와, 가열이 완료된 후 금형을 냉각하는 단계와, 제품을 금형으로부터 빼내는 이형 단계를 포함한다.The overall process includes filling a resin (bead) into the mold, heating the resin filled in the mold, cooling the mold after the heating is completed, and releasing the product from the mold.

먼저, 금형의 내부로 수지를 충진하는 단계를 수행한다.First, the step of filling the resin into the mold is performed.

금형의 내부로 수지를 충진하기 전에, 금형내 잔유 수분을 고압공기에 의해 제거하여 비드의 충진을 용이하게 하는 프리 블로워(Free Blower) 단계와, 비드를 열분해하여 충진시 에어의 배출과 금형내에 비드의 충진을 용이하게 하는 크래킹 단계를 수행한다.Before the resin is filled into the mold, a free blower step is performed to remove the residual water in the mold by high pressure air to facilitate the filling of the beads, and the air is discharged and the beads are filled in the mold when the beads are pyrolyzed. Carry out a cracking step to facilitate filling.

계속하여, 금형의 내부로 비드를 충진하는 단계를 수행한다.Subsequently, filling the beads into the mold is performed.

이러한 비드 충진 단계가 이루어지고 상기 냉각 단계를 수행하기 전에, 피더 및 호스 내에 잔류하는 비드를 고압공기에 의해 호퍼로 회수하는 블로우 백(Blow Back) 단계를 수행한다.Before the bead filling step is performed and the cooling step is performed, a blow back step of recovering the beads remaining in the feeder and the hose to the hopper by high pressure air is performed.

다음, 금형에 충진된 수지를 가열하는 단계를 수행한다.Next, a step of heating the resin filled in the mold is performed.

이러한 가열은, 일방가열, 역일방가열, 양면가열 및 보열을 포함한다.Such heating includes one-way heating, reverse one-way heating, double-sided heating and heat keeping.

일방가열은, 증기의 흐름 방향을 캐비티에서 코어로 향하도록 하는 것으로, 비드가 충진될 때 비드 사이의 에어를 외부로 배출하고 또한 비드를 약하게 융착되게 한다.One-sided heating directs the flow direction of the vapor from the cavity to the core, and when the beads are filled they release the air between the beads to the outside and also weakly fuse the beads.

역일방가열은, 증기의 흐름 방향을 코어에서 캐비티로 향하도록 하는 것으로, 일방가열에 의한 열균형을 맞추는 기능을 한다.Inverse heating causes the steam flow direction from the core to the cavity, and serves to balance the thermal balance caused by the heating in one direction.

양면가열은, 캐비티측과 코어측에서 동시에 가열이 이루어지며, 비드의 융점에 인접하는 고열로 가열하여 성형품이 제조되게 한다.The double-sided heating is performed at the same time on the cavity side and the core side, and is heated to a high temperature adjacent to the melting point of the beads so that the molded article is produced.

보열은, 드레인밸브와 증기밸브를 닫아 금형을 외부와 차단시킴으로써 성형품 전체의 융착을 균일화한다.The heat retention uniformly fuses the molded product by closing the drain valve and the steam valve to block the mold from the outside.

다음, 가열이 완료된 후 금형을 냉각하는 단계를 수행한다.Next, the step of cooling the mold after the heating is completed.

이러한 냉각은 예비냉각, 제1 수냉각, 제2 수냉각 및 방냉을 포함한다.Such cooling includes precooling, first water cooling, second water cooling and room cooling.

예비냉각은, 드레인밸브를 닫은 상태로 금형 내부로 냉각수를 넣은 후 내압 을 낮추는 과정이다.Pre-cooling is a process of lowering the internal pressure after the cooling water is put into the mold with the drain valve closed.

제1 수냉각은, 캐비티와 코어금형을 동시에 물로 냉각시킴에 의해 성형품이 냉각되게 한다.The first water cooling allows the molded article to be cooled by simultaneously cooling the cavity and the core mold with water.

제2 수냉각은, 코어금형만을 물로 냉각시킴에 의해, 캐비티 금형과의 온도 균형을 맞추는 기능을 한다.The second water cooling functions to balance the temperature with the cavity mold by cooling only the core mold with water.

방냉은, 수냉을 종료하고 에어에 의한 냉각에 의해 수행된다. 금형 온도로 성형품을 냉각하고 또한 냉각의 균일화가 이루어진다.The cooling is performed by the end of the water cooling and cooling by air. The molded article is cooled to the mold temperature and the cooling is made uniform.

다음, 제품을 금형으로부터 빼내는 이형 단계를 수행한다.Next, a release step is performed to remove the product from the mold.

이러한 이형은 제1 이형, 제2 이형 및 이젝터를 포함한다.Such releases include first release, second release, and ejector.

제1 이형은, 금형과 성형품의 표면을 이형시킬 때 이형을 용이하게 하기 위해, 금형을 닫고 압축 에어를 주입함에 의해 이루어진다.The first mold release is performed by closing the mold and injecting compressed air in order to facilitate the mold release when the surfaces of the mold and the molded article are released.

제2 이형은, 성형품을 캐비티 쪽으로 붙도록 하기 위해 코어 쪽에서 에어를 주입하는 것에 의해 이루어진다.The second mold release is made by injecting air from the core side in order to stick the molded article toward the cavity.

이젝터는, 금형 개방 도중에 캐비티 쪽에서 에어를 주입하고 성형품을 캐비티 금형에서 쉽게 이형되도록 이젝터 핀이 사용된다.The ejector is used with ejector pins to inject air from the cavity side during mold opening and to easily release the molded article from the cavity mold.

특히, 본 발명의 경우, 금형의 내부로 비드를 충진할 때, 고압의 에어를 분사함에 의해 금형의 내부에서 에어커튼이 형성되게 하고, 이 에어커튼은 금형의 내부에서 발포특성이 다른 복수의 수지 사이의 경계부를 형성한다.In particular, in the case of the present invention, when filling the beads into the mold, the air curtain is formed in the mold by injecting a high-pressure air, the air curtain is a plurality of resins having different foaming characteristics in the mold Form a boundary between them.

상기한 구성으로 이루어진 본 발명의 이종배율 발포 성형장치 및 방법에 의 하면, 고압의 에어를 분사하여 에어커튼을 형성함으로써 그 에어커튼에 의해 발포특성이 다른 복수의 수지 사이의 경계부를 이루도록 하여, 이종배율 발포 성형체를 제조할 수 있다.According to the heterogeneous expansion foam molding apparatus and method of the present invention having the above-described configuration, by forming an air curtain by injecting high-pressure air, the air curtain forms a boundary between a plurality of resins having different foaming characteristics. A magnification foam molded article can be produced.

특히, 격판 등에 의해 기계적으로 경계부를 형성하는 것과 비교할 때 경계부에서의 공극 발생이 없기 때문에 경계부에서의 강도가 향상되는 우수한 효과를 갖는다.In particular, since there is no generation of voids at the boundary compared with mechanically forming the boundary by diaphragm or the like, the strength at the boundary is improved.

Claims (6)

이종배율 발포용 수지를 금형의 내부로 공급하여 이종배율 발포 성형체를 제조하도록 구성된 이종배율 발포 성형장치로서,A hetero magnification foam molding apparatus configured to supply a hetero magnification foaming resin into a mold to produce a hetero magnification foam molded article, 금형의 내부에 에어커튼이 형성되도록 고압공기를 분사하는 고압공기 분사구멍(12)이 형성된 고정측 캐비티(10)와,A fixed side cavity 10 having a high pressure air injection hole 12 for injecting high pressure air such that an air curtain is formed in the mold; 상기 고압공기 분사구멍(12)에서 분사된 고압공기가 배출되는 고압공기 배출구멍(22)이 형성된 이동측 코어(20)를 포함하여 구성된 이종배율 발포 성형장치.And a moving side core (20) having a high pressure air discharge hole (22) through which the high pressure air injected from the high pressure air injection hole (12) is discharged. 제1항에 있어서, 상기 고정측 캐비티(10)와 이동측 코어(20)의 내면에는 상기 고압공기 분사구멍(12)에서 고압공기 배출구멍(22) 쪽으로 이동하는 방향으로 길게 형성된 나사산 모양의 가이드홈(11)(21)이 구비됨을 특징으로 하는 이종배율 발포 성형장치.According to claim 1, The fixed side cavity 10 and the inner side of the moving side core 20 is a thread-shaped guide formed in the direction moving toward the high pressure air discharge hole 22 from the high pressure air injection hole 12 Heterogeneous expansion molding apparatus characterized in that the groove (11) (21) is provided. 제1항 또는 제2항에 있어서, 상기 고압공기 배출구멍은, 여러 개의 슬릿 모양으로 형성됨을 특징으로 하는 이종배율 발포 성형장치.The heterogeneous expansion molding apparatus according to claim 1 or 2, wherein the high-pressure air discharge hole is formed in a plurality of slit shapes. 제1항 또는 제2항에 있어서, 상기 고압공기 배출구멍은, 여러 개의 원형 구멍이 일정 간격 떨어져 배치된 모양으로 형성됨을 특징으로 하는 이종배율 발포 성형장치.The heterogeneous expansion molding apparatus according to claim 1 or 2, wherein the high-pressure air discharge holes are formed in a shape in which a plurality of circular holes are spaced apart by a predetermined interval. 제1항 또는 제2항에 있어서, 상기 고압공기 배출구멍은, 내경의 크기가 상대적으로 크게 형성된 대경부(26)와 내경의 크기가 상대적으로 작게 형성된 소경부(27)로 이루어짐을 특징으로 하는 이종배율 발포 성형장치.The method of claim 1 or 2, wherein the high-pressure air discharge hole, characterized in that the large diameter portion 26 is formed of a relatively large inner diameter and the small diameter portion 27 is formed a relatively small size of the inner diameter. Heterogeneous expansion foam molding apparatus. 고압공기의 분사에 의해 금형의 내부에 에어커튼을 형성하고 그 에어커튼에 의해 형성된 경계부의 양쪽에 이종배율 발포용 수지를 각각 공급하여 이종배율 발포 성형체를 제조하는 것을 특징으로 하는 이종배율 발포 성형방법.A double magnification foam molding method for forming a double magnification foam molded article by forming an air curtain in the mold by injection of high pressure air and supplying a hetero magnification foam resin to both sides of the boundary formed by the air curtain. .
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