Evaluation of replication properties on moulded surface by ultrasonic injection moulding system

Abstract

An ultrasonic injection moulding (UIM) system, which applies ultrasonic waves to injection moulding, as a precision injection moulding technology was developed. Replication properties of the microstructure of the moulded surface were evaluated by the UIM system. In particular, the effects of oscillation conditions on the replication ratio of the moulded surface were investigated. As a result, the replication ratio of the moulded surface was significantly improved in UIM compared with that in conventional moulding. The replication ratio increased when the ultrasonic wave was applied immediately after the resin was filled in a cavity. Results showed that, by applying ultrasonic waves, oscillatory flow was generated inside the cavity and consequently the surface replication was increased. The surface replication during packing and holding stages was improved by the oscillatory flow provided by the ultrasonic vibration.

Keywords

ULTRASONIC WAVE INJECTION MOULDING MICROSTRUCTURE REPLICATION PROPERTY OSCILLATORY FLOW POLYCARBONATE

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