New plasticising process for increased precision and reduced residence times in injection moulding of micro parts

This paper describes the design, development and commissioning of an alternative plasticising unit for micro injection moulding. In the first step, the geometry of the so-called Inverse screw is designed and a test rig for plasticising trials is developed. After optimising the geometry based on experimental tests different concepts for non-return valves are designed and tested for their closing performance. Finally, the concept is transferred to a micro injection moulding machine and the applicability in practical investigations is demonstrated.