ポリアセタール射出成形品におけるウェルドラインのモルホロジーと特性
Morphology and Properties of Weld Line in Injection Molded Polyacetal
水野 渡・泊 清隆・_田泰以
Mizuno, Wataru / Tomari, Kiyotaka / Hamada, Hiroyuki
The morphology and tensile properties of polyacetal in molded standard bars with a weld line were investigated. The morphology of the samples without weld lines showed a layer structure with skin, middle and core layers. The weld line region morphology of the samples with weld lines contained transcrystalline and core regions. The samples without weld lines broke after necking. The yield strength of the samples without weld lines increased with increasing mold temperature and decreasing cylinder temperature. The displacements of the samples without weld lines decrease with increasing mold temperature and decreasing with cylinder temperature. The samples with weld lines broke after cracking at weld lines. The yield strength of the samples with weld lines increased with increasing mold temperature. The displacements of the samples with weld lines were decreased by the cracking at weld lines.
Key words: Polyacetal / Tensile properties / Morphology / Weld line