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