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Progress in Rubber, Plastics and Recycling Technology

ANALYSIS OF THE WATER ASSISTED INJECTION TECHNIQUE BY USING ULTRASONIC

January 1, 2013 By: Becker S; Hopmann Ch Research article

Title: ANALYSIS OF THE WATER ASSISTED INJECTION TECHNIQUE BY USING ULTRASONIC
Page Range: p.55-68
Author(s): Becker S; Hopmann Ch
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Journal: Progress in Rubber, Plastics and Recycling Technology
Issue Year: prprt
Volume: 29
Issue No: No.1

Abstract
Water-assisted injection technique (WAIT) is well established for the production of plastics parts with functional hollow sections. This technique is widely used to manufacture handholds and pipes for transportation of fluids in particular. The process sequence of WAIT is characterised by the injection of water into the mould part after the filling stage. Thus, the still liquid melt is displaced and a cavity is formed in the interior of the part. Since WAIT is primarily used for the production of technical parts, a comprehensive quality control and process monitoring is essential [2, 3]. The moulding process is much more complex compared to the injection moulding of compact parts. Furthermore, internal properties (e.g. the residual wall thickness, eccentricity) or internal part defects (e.g. water inclusions) play a decisive role in the compliance with quality requirements. A promising approach in this context is the utilisation of the ultrasonic measurement technology for the analysis of the hollow space formation and for the identification of internal part properties. 5 Refs.

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