干渉ふく射照射による高分子射出成形品表面層の複屈折のパターン状制御

概要

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In this paper, the authors propose a novel technique for controlling the birefringence in the surface region of polymer injection-moldings as a described "pattern" by utilizing interfered laser irradiation. In general, surface region of the injection-molded polymer products inherently contain large birefringence due to molecular orientation, since the high-temperature polymer melt is suddenly cooled in its surface region by the unsteady heat transfer to the cold mold wall during the melt flows within the mold cavity. The proposed technique controls the unsteady heat transfer by utilizing heat generation within the polymer in the surface region due to interfered laser irradiation, so as to reduce generation of birefringence as a pattern. The effects of molding and irradiation conditions on the recorded birefringence pattern were examined both experimentally and numerically, and the results clearly showed that the recordability of the birefringence pattern is dominated by the thickness profile of low-temperature region appeared on the polymer surface adjacent to the mold wall due to interfered laser irradiation.
一般社団法人日本機械学会の論文
2000-12-25