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적외선 예열을 이용한 롤-투-플랫 텍스쳐링 시스템 개발과 공정 변수의 연구

적외선 예열을 이용한 롤-투-플랫 텍스쳐링 시스템 개발과 공정 변수의 연구
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Manufacturing technology of nano/micro structure has been utilized since the information technology and the bio technology increased its importance in these days. Thermoplastic materials have been used in mass production of nano/micro structure because of their various characteristics and low cost. Roll type texturing, one of thermoplastic mass production method, has simple characteristics of continuous and one-step process which Rolling cylindrical mold on the thermoplastic substrate with proper pressure and temperature. However, this method does not have any specific cooling process which setting textured structure under glass transition temperature. The absence of cooling process causes recovery or reflow problem, so the textured structure shows distortion of its shape. That bad transcription quality with respect to the roll mold increases with height of the structure of the mold. In case of transcribing structures with height bigger than 100 μm, the transcription quality of depth decreases to less than 60%. However, structures more than 100 μm depth are applied to IT or BT technologies, for example microfluidic devices. To increase transcription quality of micro structure and apply to microfluidic devices, 3 objectives were set in this study, 1) Development of Roll-to-Flat system to increase transcription quality, 2) Processing parametric study and optimization with Taguchi method, 3) Application to the fabrication of microfluidic device. Roll-to-Flat system was developed with components: roll mold, cartridge heater-temperature controller, pneumatic cylinder, and step motor based 1-axis actuator. For the fast heating and cooling of the thermoplastic substrate, Infrared preheating system was applied to Roll-to-Flat system. Infrared preheating system showed surface temperature difference of the substrate with before and after of the roll mold contact, and increase of the transcription quality. Four main controllable processing parameters
roll mold temperature, pressure of pneumatic cylinder, speed of 1-axis actuator, surface temperature of the preheated substrate, were studied experimentally. For the efficient study, L9 (34, 4 paramters, 3 levels) orthogonal array based Taguchi method was used. Optimization of transcription quality and processing parameters was estimated with Taguchi method, and its reliability was tested by experiment. As a application of developed Roll-to-Flat system, microfluidic devices were fabricated and its feasibility was tested with microfluidic experiment.
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