• 제목/요약/키워드: In-mold coating

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사출금형 안에서 코팅을 위한 충돌혼합에 관한 해석 (Analysis of impingement mixing for coating in injection mold)

  • 김슬우;이호상
    • Design & Manufacturing
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    • 제13권4호
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    • pp.1-9
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    • 2019
  • In-mold Coating is a method that can simultaneously perform injection molding and surface coating in injection mold. The material used for coating is two-component polyurethane which is composed of polyol and isocyanate. L-type mixing head can be used to mix polyol and isocyanate uniformly, and inject them inside the mold cavity. The surface quality of the injection molded products by using in-mold coating depends on the mixing uniformity between main agent and hardener. In this study, flow analysis was performed to design a mixing head for uniform mixing of two-component polyurethane. Especially the effects of design parameters of mixing head on mixing uniformity and nozzle pressure were investigated. The parameters of mixing head were mixing chamber diameter, cleaning cylinder diameter, nozzle alignment angle in the horizontal and vertical direction, and cleaning piston position. It was found that optimal design values were mixing chamber diameter of 3.5 mm, cleaning cylinder diameter of 5.0 mm, nozzle horizontal/vertical alignment angles of 140°/160°, and cleaning piston position of 1.8 mm. The optimal values would be used to develop a two-component mixing head achieving an uniform mixing for in-mold coating.

자동차 주유구 커버에 대한 사출성형과 2색 코팅 동시 구현에 관한 연구 (A study on simultaneous injection molding and two-color coating for car gas cap cover)

  • 배형섭;박동현;김부곤;서창호;허원근;이호상
    • Design & Manufacturing
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    • 제15권1호
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    • pp.32-40
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    • 2021
  • Mold design for in-mold coating was carried out to achieve simultaneous injection molding and two-color coating for car gas cap cover. The developed mold includes one core and three cavities which are composed of a substrate cavity and two coating cavities. To provide a sealing edge for complete seal during the second coating, the first coated material was used at the boundary between the first coating and the second one, and injection molded substrate was used at the parting line. The materials used were PC/ABS for substrate and 2-component Polyurea for coating. Through experiments, it was found that the suggested sealing edges were effective for complete seal during the second coating. In cavity pressure traces, there were three peaks caused by mold closing, coating-material injection and cleaning-piston advancement inside the mixing head. The cavity pressure increased with decreasing coating thickness.

자동차 암레스트의 사출성형과 인몰드코팅에 관한 해석 (Analysis for injection molding and in-mold coating of automotive armrests)

  • 박종락;이호상
    • Design & Manufacturing
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    • 제13권1호
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    • pp.48-54
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    • 2019
  • Analytical and experimental study were carried out in order to achieve simultaneous coating and injection molding of an automotive armrest. A mold was designed to be included one core and two cavities, which were composed of a substrate cavity and a coating cavity. The materials used were PC/ABS for substrate and 2-component Polyurethane for coating. The predicted flow patterns were in good agreement with experimental results in injection molding and in-mold coating. Based on analysis and experiment, it was found that the optimal processing conditions were packing pressure of 90MPa and holding time of 7sec.

원통금형의 전자빔 가공을 위한 PR 코팅 및 측정 팁을 이용한 두께측정 (PR Coating for Electron Beam Lithography of Cylindrical Mold and Measuring Coating Thickness of It using Measuring Tip)

  • 이승우;김정오;서정
    • 한국정밀공학회지
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    • 제29권10호
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    • pp.1144-1148
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    • 2012
  • Process conditions for generating nano patterns handle different process according to the pattern characteristics, and different process data according to patterns in questions. To efficiently find optimal process conditions for generating nano patterns, process data by experiment is needed consideration of the pattern characteristics concerning the equipment. In particular, coating methods of a cylindrical mold differ from it of a flat plate because of viscosity of coating materials. Also the coating thickness affects nano process and pattern line width. So coating method of coating thickness for cylindrical mold is very important on nano pattern generating. In this study, a method is proposed for coating Photo Resist through the spray in order to coat cylindrical mold and measuring the thickness of coating using measuring tip considering the size of cylindrical mold because there is no method in the existing SEM. The proposed method is applied to a real printed electronics system to verify its accuracy and efficiency.

A Study on the Behavior of Bubbles Trapped in the In-Mold Coating Process

  • NguyenThi, Phuong;Kwon, Arim;Yoo, Yeong-Eun;Yoon, Jae Sung
    • 한국생산제조학회지
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    • 제21권6호
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    • pp.998-1002
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    • 2012
  • This paper investigates the behavior of bubbles trapped in the in-mold coating (IMC) process. Silicon oil with different viscosity, 100, 150, 200, 300 and 400cps, was selected instead of the coating materials. To observe the flow front inside, a special mold was designed, where front plate was made of transparent material (acrylate). The overall size of front plate was $150mm{\times}120mm$. Mold gate location can be changed from up to down. Four heaters were used to investigate the effectiveness of temperature. The results show that silicon viscosity, mold gate location and mold temperature play an important role on the appearance of bubbles trapped in IMC process.

오일팜 EFB 섬유 적용에 따른 펄프몰드 공정효율 및 제품품질 변화 (Changes in the Process Efficiency and Product Properties of Pulp Mold by the Application of Oil Palm EFB)

  • 김동섭;성용주;김철환;김세빈
    • 펄프종이기술
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    • 제48권1호
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    • pp.67-74
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    • 2016
  • The demand of environmental friendly packaging materials such as pulp mold has been increased. The application of the oil palm biomass, EFB (Empty Fruit Bunch) fiber as natural raw materials to the pulp mold could increase the usability of the pulp mold by the reduced production cost brought from the relatively low cost of EFB. The effects of the EFB(Empty Fruit Bunch) fibers on the properties of pulp mold and on the process efficiency were evaluated in this study. The pulp mold samples were prepared with mixture ONP (Old news paper) and EFB by using laboratory wet pulp molder. The changes in the drying efficiency were measured with the changes in the solid contents of pulp mold samples during drying process. The efficiency of the surface coating treatment on the pulp mold depending on the condition of the pulp mold samples were also evaluated in order to improve the water resistance properties of pulp mold. The addition of EFB increased the drying efficiency by providing the bulkier structure and the higher water contact angle, which indicated the better water resistance properties. The water resistance were improved by the surface coating treatments and the application of surface coating on the pulp mold at the higher moisture contents resulted in the higher improvement in the water resistance. The bulkier structure originated from the application of EFB fiber reduced the effects of the surface coating, which could be overcome by the control of surface coating process.

FMC법에서 모형 도형제가 순알루미늄 주물의 응고와 주형의 열적거동에 미치는 영향 (The Effects of Pattern Coatings on the Solidification of Pure Aluminum Castings and the Thermal Behavior of Molds in FMC Processes)

  • 조남돈;김용남
    • 한국주조공학회지
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    • 제7권2호
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    • pp.122-132
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    • 1987
  • Full mold casting process is a new technique offering numerous advantages and promising possibilities. The present study is aimed to bring out the results of experiments carried out to study the effect of pattern coatings on the solidification of 99.5% pure aluminum plate-shaped castings in the various sand molds and the thermal behavior of the molds. The results of the investigation indicate that (i) with increase in pattern coating thickness, the relative chilling power decreases gradually for silica and increases for zircon coating, and (ii) the application of a pattern coating significantly reduces the maximum interface temperature by the mold which is more pronounced in the case of thinner mold wall. The investigation also indicates that Chvorinov's rule is not found to be valid for the casting in the full mold, with or without pattern coating. Therefore in full mold process, the pattern coating thickness will be a very important parameter in the study of thermal behavior.

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In-mold Decoration 포일에 사용되는 경질 코팅 수지의 전자빔 경화 (Electron Beam Curing of Hard Coating Resin for In-mold Decoration Foils)

  • 심현석;윤덕우;김건석;이광희;이병철
    • 폴리머
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    • 제35권2호
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    • pp.141-145
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    • 2011
  • In-mold decoration 포일의 경질 코팅 층에 사용하는 수지를 대상으로 전자빔(electron beam, EB) 경화에 관한 연구를 수행하였다. 시료에 다른 양의 EB를 조사하고 경화 반응 정도를 Fourier transform infrared(FTIR) spectroscopy를 사용하여 관찰하였다. EB 조사선량 증가에 따른 코팅 물성의 변화를 표면 경도와 내마모성을 중심으로 알아보았다. 또한 나노 입자 첨가가 코팅 물성에 미치는 영향을 조사하였다. 본 연구로부터 얻은 실험적 결과는 자외선(ultraviolet, UV) 경화 시스템과 유사한 EB 경화 시스템의 상업적 개발에 이용될 수 있을 것으로 기대된다.

인몰드 코팅을 위한 이액형 폴리우레탄의 혼합특성에 관한 해석적 연구 (A Study on Mixing Characteristics of Two-component Polyurethane for In-mold Coating)

  • 이호상;김동미
    • 한국정밀공학회지
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    • 제30권3호
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    • pp.317-323
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    • 2013
  • In-mold coating is a reactive fluid designed to improve the surface quality of injection molded thermoplastic substrate in functional and cosmetic properties. In this study, a mixing head for in-mold coating was designed, and mixing characteristics of two-component polyurethane flowing through runner were investigated based on flow simulations. In order to achieve uniform mixing of two components injected through straight mixing head, an impingement aftermixer was used in runner design. Semi-circular cross-section was better than circular one for runners for uniform mixing. With increasing runner length and flow rate, mixing became more uniform. In addition, the degree of mixing was more improved with decreasing viscosity of isocyanate.

펄프몰드용 새로운 고기능 코팅제 제조기술개발(제1보) - 합성 및 천연코팅제의 기능 구명 - (Development of Higher functional Coating Agents for Pulp Mold (I))

  • 강진하;임현아
    • 펄프종이기술
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    • 제34권4호
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    • pp.37-43
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    • 2002
  • In recent years, numerous studies have been carried out to find out the possible substitution of PE-coated paperboards used in packaging of watery or oily foods. Accordingly, this study was carried out to obtain the basic data for producing higher functional coating agents for pulp mold by evaluating various kinds of synthetic and natural coating agents on the market. Physical properties of coated paperboards were tested. Conclusions obtained from this study were as follows. AKD and PVA showed higher functions than the other synthetic coating agents, while functions of CMC, Com starch and Oxidized starch were higher than those of other natural coating agents. Based on concentrations, AKD 0.5%, PVA 10%, CMC 1.5%, corn starch 6% and oxidized starch 8% were appeared as the proper concentrations. W3 consider that AKD may be suitable for the storage of higher moisture vegetables and other food, and PVA may be suitable for higher oily fried food.