可視化加熱シリンダによる計量可塑化過程の画像解析

第1報 可視化定量解析手法

抄録

The reciprocating plastication process in injection molding is performed intermittently and the relative positions of the screw and heating cylinder always changes. In order to visualize the process, we developed a glass-inserted heating cylinder and screw displacement tracing unit which fixes the view to one position of the screw and captures video images at that position. In this study, we analyzed the reciprocating plastication process of polypropylene. The results can be summarized as below:
(1) The resin melting process can be shown clearly by an extended lamination image of the screw surface, which is created from the obtained video images. The solid bed ratio, which is the ratio of the solid bed width to the channel width, was calculated from the extended image. The variation of this solid-bed ratio reflects the change in the melting pattern. The results confirm that a quantitative analysis of the reciprocating plastication process is feasible.
(2) Two types of solid-bed break-up phenomena occurred in the second half of the screw compression zone in each molding condition. It is thought that the solid-bed is partially low density at the start of the charge process at the entrance of the screw compression zone and the second half of the feed zone, and that the break-up occurs as the plastication process progresses.