Design of precision hot embossing machine for micropatterning on PMMA

SS Bahga, JP Khatait - Journal of Micro …, 2021 - asmedigitalcollection.asme.org
Journal of Micro and Nano-Manufacturing, 2021asmedigitalcollection.asme.org
A microfluidic chip requires microchannels to be created on a substrate. This paper focuses
on the design and development of a precision hot embossing machine for replication of
microstructures on a polymethyl methacrylate (PMMA) substrate. Kinematic coupling using
three spherical balls in radial v-grooves is used to achieve precise positioning of the mold
insert with the base. Flexure-based parallel guidance mechanism is used for one degree-of-
freedom (DOF) motion required for the embossing process. The mechanism allows the …
Abstract
A microfluidic chip requires microchannels to be created on a substrate. This paper focuses on the design and development of a precision hot embossing machine for replication of microstructures on a polymethyl methacrylate (PMMA) substrate. Kinematic coupling using three spherical balls in radial v-grooves is used to achieve precise positioning of the mold insert with the base. Flexure-based parallel guidance mechanism is used for one degree-of-freedom (DOF) motion required for the embossing process. The mechanism allows the motion of the mold normal to the substrate surface. Flexure-based kinematic coupling with the thermal center is designed to mitigate thermal stress build-up during heating and cooling of the mold insert. An Arduino-based microcontroller is developed to control the temperature profile during the process. A prototype is fabricated and experiments are performed with an aluminum mold insert on a PMMA substrate. The result shows the feasibility of the concept and the setup can be used to develop a cost-effective precision hot embossing machine for creating micropatterns for microfluidic applications.
The American Society of Mechanical Engineers
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