In-process visualization of kinetic and thermal behaviors of high thermal conductivity PPS

High thermal conductivity PPS is expected to be applied to cooling cases of in-vehicle parts because of its light weight and high heat dissipation. However, the flowing behavior of this resin is so peculiar that it can causes breakage at the flow front during the filling process, resulting in short...

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Bibliographic Details
Main Authors: Kurita, Akifumi, Yoshimura, Yohei, Suzuki, Makoto, Yokoi, Hidetoshi, Kajihara, Yusuke
Format: Conference Proceeding
Language:English
Subjects:
Breakage
Conduction heating
Conductive heat transfer
Cooling
Heat conductivity
Infrared cameras
Optimization
Resins
Sapphire
Surface layers
Thermal conductivity
Thermodynamic properties
Visualization
Weight reduction
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Summary:High thermal conductivity PPS is expected to be applied to cooling cases of in-vehicle parts because of its light weight and high heat dissipation. However, the flowing behavior of this resin is so peculiar that it can causes breakage at the flow front during the filling process, resulting in short shots and cracks on the surface layer at the end of the flow. In order to suppress these defects, it is necessary to elucidate the filling behavior and obtain the requirements for optimization. We thus here intend to visualize the filling behavior of high thermal conductivity PPS. To achieve this goal, we develop an in-process visualization system to reveal both thermal and kinetic behavior of the resin while the resin is filling in the cavity. In the system, a sapphire prism glass is utilized in the mold for visualization since it shows high strength, high heat conduction, and high infrared transmittance. Both a high-speed visible camera for kinetic behavior and an infrared camera for thermal behavior are used. With the developed system, we successfully obtain the filling behavior of thermal conductivity PPS for the first time. Visualization experiments show that the temperature of conventional PPS gradually decreases from the tip of the flow to the rear. On the other hand, the temperature of the high thermal conductivity PPS drops sharply from the tip of the flow to the rear, and the breakage at the flow front near the cavity wall is generated. Our interpretation is that the flow front near the cavity wall can be easily broken when it is stretched since the ductility of the high thermal conductivity PPS largely decreases because of the rapid temperature drop.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0135767