KR100246928B1 - Plastic forming method offering high quality appearance of product - Google Patents

Plastic forming method offering high quality appearance of product Download PDF

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Publication number
KR100246928B1
KR100246928B1 KR1019970055761A KR19970055761A KR100246928B1 KR 100246928 B1 KR100246928 B1 KR 100246928B1 KR 1019970055761 A KR1019970055761 A KR 1019970055761A KR 19970055761 A KR19970055761 A KR 19970055761A KR 100246928 B1 KR100246928 B1 KR 100246928B1
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South Korea
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mold
temperature
molding method
thermoplastic resin
molded article
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KR1019970055761A
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Korean (ko)
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KR19990034257A (en
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아츄시 에비사와
아키라 시카노
토호루 슈지야마
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제오프 알 데일
지이 플라스틱 제펜 리미티드
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Priority to KR1019970055761A priority Critical patent/KR100246928B1/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
    • B29C45/76Measuring, controlling or regulating
    • B29C45/78Measuring, controlling or regulating of temperature
    • 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
    • B29C45/1703Introducing an auxiliary fluid into the mould
    • 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
    • B29C45/72Heating or cooling
    • B29C45/73Heating or cooling of the mould
    • B29C45/7306Control circuits therefor
    • 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
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76494Controlled parameter
    • B29C2945/76531Temperature

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

Abstract

소망하는 고품질외관을 갖는 플라스틱성형품을 얻을 수 있는 성형법을 제공하는 것으로서, 열가소성수지의 가스어시스트성형법에 있어서, 용융된 열가소성수지를 금형내부로 사출할 때, 그 금형의 금형온도를 사출하는 열가소성수지의 열변형온도보다 10-100℃높은 온도가 되도록 제어하는 고품질외관을 갖는 플라스틱성형품을 얻는 성형법이다.The present invention provides a molding method for obtaining a plastic molded article having a desired high quality appearance, and in the gas assist molding method of a thermoplastic resin, when a molten thermoplastic resin is injected into a mold, a mold temperature of the mold is injected. It is a molding method to obtain a plastic molded article having a high-quality appearance that is controlled to be a temperature 10-100 ℃ higher than the heat deformation temperature.

Description

고품질외관을 갖는 플라스틱 성형법Plastic molding method with high quality appearance

본 발명은 열가소성수지의 가스어시스트성형법에 있어서, 각종 제품의 외장부품과 외판 등의 성형품에서 고품질의 표면외관이 요구되는 분야에 적용가능한 플라스틱성형품을 얻기 위한 성형법에 관한 것으로, 특히 웰드라인과 젯팅 등의 외관불량, 무기필러충진재에 기인하는 외관불량을 해소하기 위한 고품질외관을 갖는 플라스틱성형품을 얻는 성형법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding method for obtaining a plastic molded article applicable to a field requiring high quality surface appearance in molded parts such as exterior parts and outer plates of various products, in particular, weld lines and jetting. The present invention relates to a molding method for obtaining a plastic molded article having a high-quality appearance for eliminating appearance defects caused by poor appearance and inorganic filler filler.

종래, 가스어시스트성형법에 있어서 성형품내부에 불활성가스를 주입할 때, 중공부를 목표대로 성형하기 위하여 가스채널이라고 불리는 두꺼운 부분을 형성하고 있다. 이 두꺼운 부분에 대해서는 성형품의 일반면과의 제품두께에 차이를 주고 불활성가스가 두꺼운 부분에 대하여 선택적으로 들어가도록 설계하고 있다. 그러나 제품두께차가 있기 때문에 일반면과 가스채널부에서의 용융수지의 흐름속도가 다르기 때문에 웰드라인이 발생하고, 성형품외관을 손상하였다.Conventionally, when inert gas is injected into a molded article in the gas assist molding method, a thick portion called a gas channel is formed in order to mold the hollow portion as a target. This thick part is designed to give a difference in product thickness from the general surface of the molded part and to selectively enter the inert gas into the thick part. However, due to the difference in product thickness, weld lines occurred because the flow rates of the molten resin in the general surface and the gas channel part were different, which damaged the appearance of the molded product.

또한, 가스어시스트성형의 특징의 하니인 제품 두께가 10mm를 넘는 극히 두꺼운 성형에 있어서는, 용융수지가 금형내의 게이트를 통과하여 제품부로 흐를때에 극단적인 체적팽창을 일으키기 때문에 수지온도가 강하여 젯팅이 발생하게 되고 성형품외관을 손상하였다.In addition, in the case of extremely thick molding having a product thickness of more than 10 mm, which is a characteristic of gas assist molding, jetting occurs due to the strong resin temperature because molten resin causes extreme volume expansion when it flows through the gate in the mold to the product part. And damaged molding appearance.

또한, 가스어시스트성형에 있어서, 무기필러를 충전한 수지를 사용하는 경우, 일반사출성형에 비하여 금형내 수지압력이 낮기 때문에 금형전사성이 나쁘고, 무기필러가 성형품표면에 들떠서 성형품외관을 손상하였다.In addition, in the gas assist molding, when the resin filled with the inorganic filler is used, the mold transfer property is poor because the resin pressure in the mold is lower than that of the general injection molding, and the inorganic filler floats on the molded article surface to damage the appearance of the molded article.

이들 제반 문제점을 해결하기 위하여, 성형수지온도와 금형온도를 높게 설정하는 것은 주지의 사실이다. 그러나 용융수지가 냉각고화할 때까지의 시간이 필요하기 때문에 성형사이클이 길어져 버린다는 결점이 있었다. 또한, 금형온도를 수지의 열변형온도이상으로 설정하면 용융수지가 굳지 않아 이형될 수 없다는 문제도 발생하였다.In order to solve these problems, it is well known to set the molding resin temperature and the mold temperature high. However, there is a drawback that the molding cycle becomes long because the time required for the cooling and solidification of the molten resin is required. In addition, when the mold temperature is set above the heat deflection temperature of the resin, there is a problem that the molten resin is not hardened and cannot be released.

본 발명은 종래의 가스어시스트성형에 있어서의 결점을 해소하고, 소망하는 고품질외관을 갖는 플라스틱성형품을 얻을 수 있는 중공성형품의 성형법을 제공하는 것을 과제로 한다.An object of the present invention is to provide a method for molding a hollow molded article that can eliminate the drawbacks of conventional gas assist molding and obtain a plastic molded article having a desired high quality appearance.

본 발명의 과제는, 루프레일, 도어핸들, 그립 등의 자동차부품, FAX, 복사기등의 사무기기, 가정용 전기제품의 하우징 등으로서 이용되는 중공성형부를 갖는 가스어시스트성형법에 있어서, 제품형상을 형성하는 금형의 온도를 1사이클내에서 용융수지를 사출할 때에는 성형하는 수지의 열변형온도보다 10-100℃높게 설정하고, 냉각공정에서는 수지의 열변형온도보다 0-100℃낮게 제어할 수 있는 금형온도 제어시스템 및 그 금형구조를 이용한 중공성형품의 성형법에 의해 해결할 수 있다.SUMMARY OF THE INVENTION An object of the present invention is to form a product shape in a gas assist molding method having a hollow molded part used as an automobile part such as a roof rail, a door handle, a grip, an office device such as a fax machine, a copier, a housing of a household electrical appliance, and the like. When injecting molten resin in one cycle, the mold temperature is set to 10-100 ° C higher than the thermal deformation temperature of the resin to be molded, and the mold temperature that can be controlled 0-100 ° C lower than the thermal deformation temperature of the resin in the cooling process. This can be solved by the molding method of the hollow molded article using the control system and the mold structure thereof.

본 발명에서 사용하는 금형온도제어시스템이라는 것은, 승온시에는 냉수, 냉각유를 멈추고 열수, 가열유 혹은 전열히터를 단독 또는 병용하여 사용하고, 온도 강하시에는 열수, 가열유 혹은 전열히터로의 통전을 멈추고 냉수, 냉각유를 동일한 금형온도조절관로 또는 각각의 금형온도조절관로로 돌리는 것이다.The mold temperature control system used in the present invention is used to stop cold water and cooling oil at elevated temperature and to use hot water, heating oil or electrothermal heater alone or in combination, and to supply hot water, heating oil or electrothermal heater during temperature drop. Stop the cold water and coolant to the same mold temperature control pipe or to each mold temperature control pipe.

이때, 승온에 사용하는 열수, 가열유의 온도는 높을수록, 온도강하에 사용하는 냉수, 냉각유의 온도는 낮을수록, 또한 그 유량은 많은수록 성형사이클의 단축이 가능하게 된다. 전열히터에 대해서는 전력밀도가 높을수록 좋다.At this time, the higher the temperature of the hot water and heating oil used for the elevated temperature, the lower the temperature of the cold water and cooling oil used for the temperature drop, and the larger the flow rate, the shorter the molding cycle becomes possible. For electric heaters, the higher the power density, the better.

금형온도조절관로에 대하여 금형강도상 문제가 없는 범위에서 많이 설치할수록 효율은 좋게 되며 사이클의 단축이 가능하게 된다.The more it is installed in the range where there is no problem in mold strength with respect to the mold temperature control pipeline, the better the efficiency and the shorter the cycle becomes possible.

본 발명에 의하면, 용융수지의 사출시에 금형온도를 열변형온도보다도 높게 함으로써, 용융수지는 급격히 냉각되는 일없이 충분한 용융상태대로 충전할 수 있다.According to the present invention, when the mold temperature is higher than the heat deformation temperature at the time of injection of the molten resin, the molten resin can be filled in a sufficient molten state without being rapidly cooled.

이와같이 용융상태대로 충전함으로써, 젯팅과 웰드라인을 해소할 수 있다. 또한, 금형의 전사율도 비약적으로 좋게 되고 성형품의 광택이 향상됨과 함께 무기필러충전재료에 대해서는 필러의 들뜸은 완전히 없어지고 무충전재료와 동등한 뛰어난 외관품질의 성형품을 얻을 수 있다.By filling in the molten state in this manner, jetting and weld lines can be eliminated. In addition, the transfer rate of the mold is dramatically improved, the gloss of the molded article is improved, and the filler is completely lifted off for the inorganic filler filling material, and a molded article having excellent appearance quality equivalent to that of the non-filling material can be obtained.

제1도는 본 발명에 따른 성형법을 실시하는데 적합한 금형온도제어계의 개략구성예를 나타내는 블록도이다.1 is a block diagram showing a schematic configuration example of a mold temperature control system suitable for carrying out the molding method according to the present invention.

제2도는 본 발명에 따른 성형법을 실시하는데 적합한 금형의 실시예의 구성예를 나타내는 단면도이다.2 is a cross-sectional view showing a configuration example of an embodiment of a mold suitable for carrying out the molding method according to the present invention.

제3도는 본 발명에 따른 성형법에 의해 성형한 성형품의 실시예를 나타내는 사시도이다.3 is a perspective view showing an embodiment of a molded article molded by the molding method according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 열수용 온도조절기 2 : 냉수용 칠러1: temperature controller for hot water 2: chiller for cold water

3 : 절환·제어유니트 4 : 금형3: switching and control unit 4: mold

5 : 금형으로의 열·냉수공급로 6 : 금형으로부터의 열·냉수복귀구5: Heat and cold water supply path to the mold 6: Heat and cold water return from the mold

7 : 고정금형 8 : 가동금형7: fixed mold 8: movable mold

9 : 캐비티 10 : 탕구9: Cavity 10: Tanggu

11 : 게이트 12 : 가스주입구11: gate 12: gas inlet

이하, 실시예를 나타내는 첨부도면을 참조하면서 본 발명을 개시한다. 제1도는 본 발명에 따른 성형품의 성형법을 실시하는데 적합한 금형온도제어계의 개략구성을 나타내는 블록도이다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is disclosed, referring an accompanying drawing which shows an Example. 1 is a block diagram showing a schematic configuration of a mold temperature control system suitable for carrying out a molding method of a molded article according to the present invention.

이 금형온도제어계는, 열수용 온도조절기(1)와 냉수용 칠러(2)를 배치하고, 절환유니트(3)에 접속하고 있다. 절환·제어유니트(3)에는, 금형(4)에 냉수, 열수를 공급하기 위한 공급구(5)와 회수하기 위한 복귀구(6)이 있다. 소망하는 금형온도를 달성하기 위하여 장치내의 각 절환밸브(VIN, VR)가 적절한 상태로 되도록 절환·제어유니트(3)의 제어를 행한다.This mold temperature control system arranges the temperature controller 1 for hot water and the chiller 2 for cold water, and is connected to the switching unit 3. The switching / control unit 3 includes a supply port 5 for supplying cold water and hot water to the mold 4 and a return port 6 for recovery. In order to achieve a desired mold temperature, the switching and control unit 3 is controlled so that the respective switching valves VIN and VR in the apparatus are in an appropriate state.

제2도는 본 발명에 의한 성형법을 실시하기 위해 적합한 금형의 단면도이다. 이 금형은 고정금형(7)과 가동금형(8)의 결합면에 캐비티(9)가 형성되며, 고정금형(7)에는 캐비티(9)내에 용융수지를 충전시키기 위한 탕구(10)와 게이트(11)가 설치되고 있고, 가동금형(8)에는 충전된 수지내부에 가스를 주입하기 위한 가스주입구(12)가 있다.2 is a cross-sectional view of a mold suitable for carrying out the molding method according to the present invention. The mold is formed with a cavity 9 at the mating surface of the stationary mold 7 and the movable mold 8, and the stationary mold 7 has a spout 10 and a gate (10) for filling molten resin in the cavity 9. 11), the movable mold 8 has a gas inlet 12 for injecting gas into the filled resin.

이 실시예에서는, 열가소성수지인 변성PPO수지 Noryl GFN3(상표 : 일본 지이플라스틱(주)제, 유리섬유충전량 30%) 및 폴리카보네이트수지와 폴리브틸렌테레프탈레이트수지의 알로이 XENOY 1760(상표 : 일본 지이플라스틱(주)제, 유리섬유충전량 10%)로 행하였다. 실시예의 효과를 확인하기 위해, 동일금형을 사용하여 통상의 가스어시스트성형 등에 이용되는 금형온도로 성형을 하고 비교하였다.In this embodiment, the modified PPO resin Noryl GFN3 (trademark: made by Japan Plastic Co., Ltd., glass fiber filling amount: 30%), and an alloy of polycarbonate resin and polybutylene terephthalate resin, XENOY 1760 (trademark: Japan Paper Plastics, and a glass fiber filling amount of 10%). In order to confirm the effect of the examples, the same mold was used and the molding was performed at the mold temperature used for ordinary gas assist molding and the like.

제3도는 제2도의 금형을 이용하여 사출성형하여 얻은 성형품의 개략도이다. 가스주입에 의한 중공부를 형성하는 두께부(13)를 가지고 있다. 이 실시예의 성형은 표 1의 성형조건에 따라서 행하였다.3 is a schematic view of a molded article obtained by injection molding using the mold of FIG. It has the thickness part 13 which forms the hollow part by gas injection. Molding of this example was performed according to the molding conditions of Table 1.

Figure kpo00002
Figure kpo00002

이 실시예의 효과를 확인하기 위하여, 만능표면형상측정기((주)小坂硏究所제, MODEL SE-3H)를 사용하고, 성형품의 표면조도의 측정을 행한 결과를 표 2에 나타낸다.In order to confirm the effect of this Example, the result of having measured the surface roughness of a molded article using the universal surface shape measuring instrument (MODEL SE-3H Co., Ltd. product) is shown in Table 2.

웰드라인에 대해서도, 비교예에서는 성형품표면에 분명히 나타나며, 그 깊이는 30μ도 있었지만 본 발명에서의 성형방법을 이용한 것은 웰드라인을 확인할 수 없을 때까지 해소하였다. 또한, 젯팅에 대해서도 비교예에서는 성형품표면에 분명히 나타나며 성형조건으로 해소하는 것은 곤란하지만, 본 발명에서의 성형방법을 이용한 것은 전혀 문제없이 성형이 가능하게 되었다.Also about the weld line, the comparative example was clearly shown on the surface of the molded article, and the depth was 30 mu. In addition, in the comparative example, the jetting also appears clearly on the surface of the molded article, and it is difficult to eliminate the molding conditions. However, the molding method in the present invention can be molded without any problem.

Figure kpo00003
Figure kpo00003

본 발명에 따르면, 가스어시스트성형에 있어서 외관품질이 뛰어난 제품을 안정하게 성형할 수 있다. 특히 무기필러가 충전되어 있는 재료에 있어서는, 필러의 들뜸, 웰드라인과 젯팅 등의 문제를 해소할 수 있으므로 샌딩, 도장과 도금 등과 같은 표면외관을 개선하기 위한 2차가공을 생략할 수 있게 된다.According to the present invention, a product excellent in appearance quality can be stably molded in gas assist molding. Particularly, in the material filled with the inorganic filler, problems such as the lifting of the filler, the weld line and the jetting can be solved, so that secondary processing for improving the surface appearance such as sanding, painting and plating can be omitted.

Claims (7)

열가소성수지의 가스어시스트성형법에 있어서, 용융된 열가소성수지를 금형내부로 사출할 때, 그 금형의 금형온도가 사출하는 열가소성수지의 열변형온도보다 10-100℃높아지도록 설정되는 것을 특징으로 하는 고품질외관을 갖는 플라스틱성형품을 얻는 성형법.In the gas assist molding method of the thermoplastic resin, when the molten thermoplastic resin is injected into the mold, the mold temperature of the mold is set to be 10-100 ° C. higher than the thermal deformation temperature of the thermoplastic resin to be injected. Molding method to obtain a plastic molded article having a. 제1항에 있어서, 금형온도를 열가소성수지의 열변형온도보다 10-100℃높게 해두는 시간은 열가소성수지를 금형내부로 사출개시하고 나서 완료할 때까지의 적어도 일부의 기간인 것을 특징으로 하는 고품질외관을 갖는 플라스틱성형품을 얻는 성형법.The method of claim 1, wherein the mold temperature is set at a temperature of 10-100 ° C. higher than the thermal deformation temperature of the thermoplastic resin, which is at least part of a period from the start of the injection of the thermoplastic resin into the mold to completion. Molding method to obtain a plastic molded article having an appearance. 제1항 또는 제2항에 있어서, 성형사이클의 동안에 열가소성수지의 열변형온도보다 10-100℃높게 설정된 상기 금형온도가, 금형내부로 사출된 열가소성수지를 냉각하기 위하여, 열가소성수지의 열변형온도보다 0-100℃낮은 온도가 되도록 온도제어되는 것을 특징으로 하는 고품질외관을 갖는 플라스틱성형품을 얻는 성형법.3. The heat deflection temperature of the thermoplastic resin according to claim 1 or 2, wherein the mold temperature set 10-100 DEG C. higher than the heat deflection temperature of the thermoplastic resin during the molding cycle is used to cool the thermoplastic resin injected into the mold. Molding method to obtain a plastic molded article having a high-quality appearance characterized in that the temperature is controlled to be a temperature lower than 0-100 ℃. 제3항에 있어서, 성형사이클의 동안에 금형온도를 승온, 강하하기 시작하는 타이밍이 임의로 제어가능한 것을 특징으로 하는 고품질외관을 갖는 플라스틱성형품을 얻는 성형법.4. The molding method according to claim 3, wherein the timing at which the mold temperature starts to rise and fall during the molding cycle can be arbitrarily controlled. 제4항에 있어서, 금형의 승온을 위해 열수, 가열유 또는 전열히터의 적어도 하나의 가열원을 사용하고, 금형의 승온을 위해 냉각 또는 냉각유의 적어도 한 쪽을 사용하는 것을 특징으로 하는 고품질외관을 갖는 플라스틱성형품을 얻는 성형법.The high-quality appearance of claim 4, wherein at least one heating source of hot water, heating oil, or electrothermal heater is used for raising the temperature of the mold, and at least one of cooling or cooling oil is used for raising the temperature of the mold. Molding method to obtain a plastic molded article having. 제5항에 있어서, 상기 금형의 승온 또는 강하를 제어하는 계와 금형온도조절계가 부분적으로 공용되는 것을 특징으로 하는 고품질외관을 갖는 플라스틱성형품을 얻는 성형법.The molding method according to claim 5, wherein the system for controlling the temperature rise or fall of the mold and the mold temperature control system are partially shared. 제3항에 있어서, 상기 금형의 승온 또는 강하를 제어하는 계와 금형온도조절계가 별개의 계통으로서 형성되는 것을 특징으로 하는 고품질외관을 갖는 플라스틱성형품을 얻는 성형법.4. The molding method according to claim 3, wherein the system for controlling the temperature rise or fall of the mold and the mold temperature control system are formed as separate systems.
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