엘라스토머 TPV의 사출성형조건에 따른 기계적 물성

정영득,한성렬 한국기계가공학회 2006 한국기계가공학회지 Vol.5 No.1

Thermoplastic elastomer(TPE) has many advantages such as high flexibility, high elasticity and high elongation, etc. TPE is easily molded as plastic materials, therefore, many TPE parts are applied as home appliances and mechanical parts. However, its mechanical properties would be changed by injection molding conditions such as melt temperature, mold temperature, injection pressure and holding pressure, etc. In this study, the influences of the injection molding condition on the mechanical properties as tensile strength, hardness of thermoplastic vulcanizates(TPVs), which is one of the TPE, were investigated. By the injection molding experiment, the molding's tensile strength and hardness was influenced on the melt temperature and composition ratio of PP and EPDM. The morphology of moldings were shown by the scanning electron microscope.

다수캐비티 사출금형에서 엘라스토머 TPV의 충전 불균형

한동엽(Dong Yeop Han),권윤숙(Yun Suk Kwon),노병수(Byeong Su No),정영득(Yeong Deug Jeong) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.2

Recently, the study for filling imbalance in thermoplastic polymer has gradually been increased. However, it is hard to find the researches for filling imbalance of thermoplastic elastomer(TPE). The experiment of filling imbalance was conducted for the three kinds of thermoplastic vulcanizes(TPVs) in the mold with geometrically balanced runner system. In this experiment, the effects of the melt temperature and injection speed on the filling imbalance were investigated. To solve the filling imbalance, Runner Core pin(RC pin) in the experimental mold was adopted and it's effects was tested. In this paper, we present that the insert length of RC pin is dependent to each polymers for optimal filling balance.

동일배열 폴리프로필렌,엘라스토머,나노충전제 복합체의 전력케이블 절연체로서의 사용 가능성에 대한 문헌적 고찰

변선호 ( Sun Ho Pyun ) 한국유화학회 2012 한국응용과학기술학회지 Vol.29 No.2

본 논문은 절연유 불포함 재활용 가능 전력케이블 절연체에 동일배열 폴리프로필렌(IPP) 기반 열가소성 폴리올레핀 엘라스토머(TPO) 나노복합체 사용 가능성을 문헌적으로 고찰한 리뷰논문이다. 2010년 IPP 기반 나노복합 유전체는 파워 커패시터 연구에서 유전손실을 제외한 고전압 특성이 크게 향상되었다. IPP 기반 TPO 나노복합체 사용 자동차 외장부품 연구에서는 나노충전제 최대 3 wt% 함유로 전력케이블 절연체의 필수특성인 저온 충격성을 비롯한 기계적 특성향상이 보고되었다. 특히 유전손실의 원천인 상용화제 사용의 최소화 기술이 보고되어, 3 wt% 이하 나노충전제함유 IPP 기반 TPO의 전기적 특성조사가 필요하다. For use as recyclable power cable insulations without dielectric oil, technology trends of IPP based thermoplastic polyolefin elastomer(TPO) nanocomposites were reviewed. In 2010 research results of IPP nanocomposite dielectrics for power capacitors showed promising high voltage properties except dielectric loss. Research of IPP based TPO nanocomposites for automotive exterior parts revealed considerable improvements of mechanical properties including impact strength, especially minimization of compatibilizer content, the origin of dielectric loss. A study on electrical properties of IPP based TPO nanocomposites containing a few weight percent of nanofillers for power cable insulations is suggested.

편측 분기형 러너시스템을 가진 사출금형에서 엘라스토머 TPV의 충전 불균형

한동엽(Dong Yeop Han),정영득(Yeong Deug Jeong) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.4

Recently, the study for filling imbalance in thermoplastic polymer has gradually been increased. However, it is hard to find the researches for filling imbalance of thermoplastic elastomer(TPE). The experiment of filling imbalance was conducted for the three kinds of thermoplastic vulcanizes(TPVs) and PP polymer in the mold with geometrically balanced runner system(Unary Branch Type Runner System). In this experiment, the effects of the￢melt temperature, injection pressure and injection speed on the filling imbalance were investigated. There was also the imbalance in TPV injection molding process as well as in conventional injection molding with plastics. The tendency of filling imbalance in TPV injection molding specially decreased by taking place the hesitation of TPV melt.

엘라스토머 사출성형시 CAE 유동해석과 실제 성형품의 비교

한성렬(S. R. Han),김준형(J. H. Kim),전승경(S. G. Jeon),이규호(G. H. Lee),정영득(Y. D. Jeong) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월

Thermoplastic elastomer(TPE) can be molded by conventional injection molding. Therefore TPE injection molding could be analyzed by commercial flow analysis software. However there are a little of gaps on CAE simulation results and practical molding. In this study, the properties of TPE were measured and applied to CAE simulation for comparing the simulation flow pattern and real flow pattern. The pattern that was controlled by injection time was match. The pattern that was controlled by injection stroke and rate was not match.

TPE를 적용한 자동차 윈도우 모터커버의 개발

조영태,고범용,이충호,Cho, Young-Tae,Ko, Boum-Yong,Lee, Choong-Ho 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.1

It was attempted to develop an auto part by over molding injection mold that produces precision products in high productivity with use of an eco-friendly TPE substitute material for NBR. NBR is currently used in motor gear cover, one of the key parts in motor module for auto doors. Gear cover is composed of plastics and rubber mostly today, which requires a two (2) step process for production using two presses of different types. A hot press is used at this time for forming the rubber, which has drawback of requiring a rather long forming time of 400 seconds for one forming process. Even though this difficulty is overcome by reducing production time through employment of multi-cavity molds, time for forming process must be shortened for improvement of the productivity eventually, and the existing method of insert injection for products that have been formed with plastic material must be outgrown. In this point of view, over molding injection using TPE has a big advantage. Forming time is shortened to 54 seconds, and working the two (2) processes in series by one (1) press could solve the durability problem caused by deflection of the plastics, not to mention shortening the process time. Enhancement of productivity by almost 80% and improvement in the accuracy of the product could thus be achieved.

폴리스틸렌계 엘라스토머의 사출성형조건에 따른 기계적 물성 변화

정영득,한성렬,김준형,전승경 한국기계가공학회 2006 한국기계가공학회지 Vol.5 No.4

From the past, most of the studies about thermoplastic elastomers(TPEs) have been conducted for theirs compounded materials and morphology. However these studies do not directly affect on injection molding processing. Therefor this study is focus on the variation of mechanical properties on TPEs moldings by increasing injection molding conditions which included injection molding conditions include injection pressure, holding pressure, melt temperature, mold temperature. The used experimental TPEs is a group of styrene(TPS). Injection pressure slightly affected on tensile strength, shrinkage and hardness. Holding pressure only affected on hardness. The melt temperature was the most affective condition on tensile strength.

TPE를 적용한 자동차 윈도우 모터커버의 개발

조영태(Young-tae Cho),고범용(Boum-yong Ko),이충호(Choong-ho Lee) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.6

It was attempted to develop an auto part by over molding injection mold that produces precision products in high productivity with use of an eco-friendly TPE substitute material for NBR. NBR is currently used in motor gear cover, one of the key parts in motor module for auto doors. Gear cover is composed of plastics and rubber mostly today, which requires a two (2) step process for production using two presses of different types. A hot press is used at this time for forming the rubber, which has drawback of requiring a rather long forming time of 400 seconds for one forming process. Even though this difficulty is overcome by reducing production time through employment of multi-cavity molds, time for forming process must be shortened for improvement of the productivity eventually, and the existing method of insert injection for products that have been formed with plastic material must be outgrown. In this point of view, over molding injection using TPE has a big advantage. Forming time is shortened to 54 seconds, and working the two (2) processes in series by one (1) press could solve the durability problem caused by deflection of the plastics, not to mention shortening the process time. Enhancement of productivity by almost 80% and improvement in the accuracy of the product could thus be achieved.

자동차용 웨더스트립의 물성시험과 유한요소해석

한창용(Chang Yong Han),장왕진(Wang Jin Jang),이성범(Seong Beom Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5

Automotive industries are interested in material development with low weight and recycling. Weather strip for Automobile is made from EPDM or TPE. This study concerns uni-axial and equi-biaxial tension test to achieve stress-strain relation results. Also, we obtain nonlinear material constants that performed finite element analysis for weather strip. The finite element analysis results are executed to predict the material property of weather strip.

TPEE 소재를 이용한 펜더 인슐레이션 물성개선 연구

김보미(Bomi Kim),박장석(Jangsoek Park) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6

펜더 인슐레이션(Fender Insulation)은 펜더 패널과 사이드 아웃터 패널 사이에 장착되어 주행 시 바퀴가 회전하면서 튀게 되는 물이나 모래와 같은 기타 이물질들이 엔진 룸안으로 들어오는 것을 방지함으로써, 소음을 저감하고 운전자가 안전하게 주행할 수 있도록 돕는 역할을 한다. 기존 펜더 인슐레이션의 레이어 구조는 PE 혹은 PU필름이 폴리우레탄 폼을 감싼 형태로, 포깅 현상으로 인한 표면 손상 문제가 발생하게 된다. 또한 강성이 약해 쉽게 휘거나 꺾이므로 조립에 어려움이 발생하기도 하는데, 이는 작업 시간의 증가로 이어져 생산 효율이 떨어지는 문제가 발생한다. 본 연구에서는, EPP(Expanded Polypropylene) 폼을 금형에 인서트하고 TPEE(Thermoplastic Polyether Ester Elastomer)를 사출 성형하여 EPP 폼 전체를 감싼 형태의 펜더 인슐레이션을 제작하였다. 친환경 소재이면서도 강성이 우수한 TPEE는 VOCs(Volatile Organic Compounds)를 거의 발생하지 않으면서도 물성이 강해 표면 손상 문제와 동시에 생산 효율을 크게 개선할 수 있다. TPEE로 사출 성형한 펜더 인슐레이션은 인장강도 0.85~0.95 ㎫, 신율 150~170 %, 그리고 인열 80~93 N/cm을 가지며, 폴리우레탄 폼을 사용하여 제작한 종래 기술보다 우수한 물성을 가진 것을 확인하였다. 특히 내가수분해성 시험에서는 표면 손상, 끈적임, 부스러짐, 갈라짐이 거의 발생하지 않았으며, 냄새평가 에서도 기준치인 3등급을 만족하였다.