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Dry Electrostatic Spray Coated Towpregs for Thermoplastic Composites
Vijay Goud,Ramasamy Alagirusamy,Apurba Das,Dinesh Kalyanasundaram 한국섬유공학회 2018 Fibers and polymers Vol.19 No.2
Though the processing steps for the manufacture of thermoplastic composites present little difficulty when compared to those for thermoset composites, it is not cost effective as a result of difficulty in accomplishing thorough infusion of resin into fibers and fibrous structures. Tremendously high viscosity for thermoplastic resin leads to numerous problems in the manufacturing process of thermoplastic composites. Pre-impregnation processes such as melt impregnation or solution impregnation, tend to form a stiff towpreg that cannot be used for any textile preforming operation. Powder coating can be a destined to be a cost effective as well as efficient processing technology to produce a flexible towpreg. A method for production of flexible towpregs for thorough infusion of resin into fibers using electrostatic spray gun, which involves powder coating a bundle of filaments is described. During the powder coating process using electrostatic spray gun, powder particles fetched by a conveying air stream, from a fluidizing hopper, are charged in the high voltage corona discharge by ion bombardment and transported to the fiber tow through the combination of electrostatic, aerodynamic and gravitational forces. Aerodynamic forces have the obligation to carry the powder particles to the tow where electrostatic forces dominate and cause the adherence of powder particles to the potentially grounded tow. After the powder deposition, tow is made to pass through convective oven where powder particles glue to the reinforcement as a result of partial liquefaction of the powder. The towpreg formed is then wound by the take up device. Take up device is equipped with dancerarm which ensures constant line tension and thereby consistent powder deposition. The effects of process variables of the electrostatic spray process such as corona voltage, fluidizing air pressure, conveying air pressure, distance of gun from tow and tow velocity on maximum powder deposition are investigated and reported.
박용민(Yongmin Park),황태경(Tae Kyung Hwang),정상기(Sangki Chung),박노현(Nohyun Park),정연중(Yeanjung Jeong),허몽영(Mongyoung Huh) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.5
본 논문에서는 필라멘트 와인딩 공정을 통해 제조되는 로켓 모터케이스, 수소연료전지 자동차용 연료탱크, 산업용 고성능 압력용기 등 성능과 신뢰성을 동시에 필요로 하는 부품 제조용 소재로 주목받고 있는 탄소섬유 토우프리프레그의 국내외 최신 연구동향에 대하여 살펴보았다. Carbon fiber towpreg is the one of spotlight materials for high-performance rocket motor cases, fuel tanks for hydrogen vehicles and other high-quality commercial pressure vessels. In this article, we reviewed the recent research trends in carbon fiber towpreg.
고성능 CFRP 압력용기 적용을 위한 고인성 에폭시 Matrix에 관한 연구
박용민(Yongmin Park),정상기(Sangki Chung),정연중(Yeanjung Jeong),박노현(Nohyun Park),김소영(Soyoung Kim),허몽영(Mongyoung Huh),이학성(Haksung Lee) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11
고성능 복합재 압력용기 제조에 적용 가능한 토우프레그용 Matrix에 관한 연구를 수행하였다. 복합재 압력용기 Matrix의 요구 물성인 우수한 접착성, 높은 신율, 우수한 피로물성에 부합하는 고인성 수지 개발을 위해 열가소성 Nylon계 수지의 에폭시 수지 강인화제 (Toughener) 적용 가능성을 확인해 보았다. In this Study, in order to improve the performance of composite pressure vessel, we evaluated the applicability of thermoplastic nylon resins as epoxy toughener for carbon fiber towpreg.
3-Roll Coater를 이용한 핫멜트 에폭시-탄소섬유 토우프레그 제조방법에 관한 연구
박용민(Yongmin Park),정상기(Sangki Chung),윤영주(Youngju Yun),정연중(Yeanjung Jeong),배성우(Sungwoo Bea),허몽영(Mongyoung Huh),이학성(Haksung Lee),최동현(Donghyun Choi) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11
경량이면서 고강도인 고성능 탄소섬유 복합재 연소관 제조에 적용 가능한 핫멜트 에폭시 수지 적용탄소섬유 토우프레그 제조공정 연구를 수행하였다. 3-Roll Coater를 이용한 핫멜트 에폭시 수지함침 공정 연구를 수행하여 탄소섬유의 입사각에 따른 토우프레그의 스프레딩 및 함침특성을 연구하였으며, 이에 따른 토우프레그의 성능을 함께 평가하여 보았다. This research has been studied the manufacturing method of hot melt epoxy resin applied carbon-fiber towpreg for light-weight, high strength composite motor case. We checked the characteristics of spreading and impregnation properties of the carbon fiber in accordance with the incident angles of the carbon fiber and evaluated the performance of towpreg as well.
박용민(Yongmin Park),황태경(Tae Kyung Hwang ),정상기(Sangki Chung),박노현(Nohyun Park),장준열(Jun Yeol Jang),나창운(Changwoon Nah) 한국추진공학회 2017 한국추진공학회지 Vol.21 No.2
Tow Prepreg is the intermediate material for filament winding process that has been “pre-impregnated fiber tow” with resin system. As “dry filament winding” process emerges as a reliable alternative to conventional filament winding (called “wet filament winding”) process, interest in tow prepreg as a material for dry filament winding is rising as well. In this article, we have reviewed the recent research trends in carbon fiber tow prepreg for high-performance rocket motor cases, fuel tanks for hydrogen vehicles and other high-quality commercial pressure vessels.
수소저장용기 제작을 위한 건식필라멘트 와인딩용 토우프리프레그 평가 방법 연구
김경주(Kyoung-ju Kim),이후관(Hoo-kwan Lee),김병진(Byung-jin Kim),박용민(Yong-min Park),정연중(Yean-jung Jeong) 한국추진공학회 2020 한국추진공학회 학술대회논문집 Vol.2020 No.7
수소저장용기는 기체 상태의 수소를 고압으로 압축하여 저장하는 용기로 가스 상태인 수소의 기밀을 유지하고 700기압 이상의 내압성능을 확보하기 위해 뼈대가 되는 라이너 위에 연속으로 탄소섬유를 감는 복합재료 성형법인 필라멘트와인딩(Filament Winding) 공법으로 제작한다. 필라멘트와인딩 공법은 습식과 건식으로 분류되며, 와인딩 정밀도가 높고 섬유와 수지의 체적비 조절이 쉬운 건식와인딩 방법으로 대체되는 추세이다. 토우프리프레그는 건식와인딩을 위해 토우 한 가닥을 수지에 미리 함침시켜 놓은 프리프레그의 한 종류로서 수지/섬유 체적비가 일정하고 기계적 물성, 내열성, 내화학적 특성의 컨트롤이 가능하다는 장점을 가지고 있다. 본 연구는 수소저장용기 제작을 위해 제조된 토우프리프레그의 소재의 중요 물성평가 방법을 서술하고 있다. The hydrogen storage container is a container for compressing and storing gaseous hydrogen at high pressure, and is a composite material forming method that continuously wraps carbon fibers on a liner that serves as a skeleton to maintain gas-tightness of hydrogen in the gaseous state and secure pressure resistance of over 700 atm. It is manufactured by the filament winding method. The filament winding method is classified into wet and dry, and is replaced by a dry winding method with high winding precision and easy control of the volume ratio of fibers and resins. Tow prepreg is a kind of prepreg in which one strand of tow is pre-impregnated with resin for dry winding. It has the advantage of constant resin/fiber volume ratio and control of mechanical properties, heat resistance, and chemical properties. This study describes an important method for evaluating material properties of tow prepreg manufactured for the production of hydrogen storage containers.