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유영은(Y.-E. Yoo),김태훈(T. H. Kim),김창완(C. W. Kim),제태진(T.J. Je),최두선(D.S. Choi) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
The injection molding is very effective process for various plastic products due to its high productivity. It is also good for precise products like optical parts. Various thermoplastic materials are also available with this injection molding process. In recent, however, as the overall size of the product increases and micro or nano scale of patterns are applied to the products, we now have some problems such as low fidelity of the replication of the pattern, high molding pressure, or warpage from the in-mold stress. Injection/compression molding is studied to overcome those problems in molding large thin plate with micro pattern array on its surface. An injection compression mold is designed to 3 pieces mold for side gate. We install 4 pressure transducers and 9 thermocouples to measure the melt pressure and surface temperature in the cavity during the process. As a result, the maximum molding pressure for injection compression molding is reduced to 1/3 compared to injection molding and the uniformity of the pressure in the cavity is enhanced by about 15%.
유영은(Y.-E. Yoo),권기환(K. H. Kwon),김재현(J. H. Kim),윤재성(J.-S. Yoon),최두선(D.-S. Choi),김명호(M. H. Kim) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
UV curable resin is coated on the polymer film for very thin adhesive layer by roll-to-roll process. The thickness of the coated layer was affected by the clearance between the coating roll and the gap roll, the viscosity of the resin or the accuracy of the system, etc. Among these process parameters, the clearance was investigated to see the effect on the thickness of the coated layer. As the clearance decreases, the thickness of the coated layer decreases too, but the clearance becomes smaller than the thickness of the base film. From this result, the coating roll or the gap roll moves backward or forward when loaded. And also the adhesion characteristics was studied according to the intensity of the UV light.
유영은(Y.-E. Yoo),이관희(K.H. Lee),윤재성(J.S. Yoon),최두선(D.-S. Choi),김선경(S.K. Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Hydrophobic plastic plates employing nano surface features are injection molded using thermoplastic materials. A variotherm molding process is devised for filling the nano pores and releasing the molded nano features from the master. The size of the molded nano surface features are about 100㎚ in diameter and 200㎚ in height. The size of the molded plate is about 30㎜ × 30㎜ and the thickness is 1㎜. As molding materials, Polypropylene, PMMA, COC and PC are employed, which are all typical co㎜odity thermoplastic materials. The mold temperature(stamper temperature) is investigated as a major processing parameter for molding high aspect ratio nano surface features. Almost fully molded nano features are fabricated above a certain level of mold temperature depends on the employing material. The contact angles on the injection molded plates are measured to estimate the hydrophobicity and found to have higher contact angle up to 180% compared to the blank plate with no surface features