Fast mold surface temperature evolution in injection molding improves the surface finishing and replicability of the molded parts, and may significantly reduce frozen-in orientation. In this paper the effect of a fast control of cavity surface temperature evolution on the morphology and processing conditions of iPP molded parts has been characterized. Phenomena not previously encountered, such as a double pressure packing step when the cavity surface heating lasts longer than the packing step, have been pointed out. Significant effects on the samples frozen-in orientation have been observed by optical microscopy and confirmed by X-ray analysis. AFM analysis shows that it is possible to achieve isotropic morphology with cavity surface temperature kept constant at 150 °C for a long heating time and low holding pressure.
Fast cavity surface temperature evolution in injection molding: Control of cooling stage and final morphology analysis
Liparoti, Sara
;Titomanlio, Giuseppe
2016-01-01
Abstract
Fast mold surface temperature evolution in injection molding improves the surface finishing and replicability of the molded parts, and may significantly reduce frozen-in orientation. In this paper the effect of a fast control of cavity surface temperature evolution on the morphology and processing conditions of iPP molded parts has been characterized. Phenomena not previously encountered, such as a double pressure packing step when the cavity surface heating lasts longer than the packing step, have been pointed out. Significant effects on the samples frozen-in orientation have been observed by optical microscopy and confirmed by X-ray analysis. AFM analysis shows that it is possible to achieve isotropic morphology with cavity surface temperature kept constant at 150 °C for a long heating time and low holding pressure.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
