中文字数:5884,中文页数:15  英文字数:5042页数:10

Abstract

The purpose of this report was to experimentally study the water-assisted injection molding process of poly-butylene-terephthalate
(PBT) composites. Experiments were carried out on an 80-ton injection-molding machine equipped with a lab scale water injection sys-
tem, which included a water pump, a pressure accumulator, a water injection pin, a water tank equipped with a temperature regulator,
and a control circuit. The materials included virgin PBT and a 15% glass fiber filled PBT composite, and a plate cavity with a rib across
center was used. Various processing variables were examined in terms of their influence on the length of water penetration in molded
parts, and mechanical property tests were performed on these parts. X-ray diffraction (XRD) was also used to identify the material
and structural parameters. Finally, a comparison was made between water-assisted and gas-assisted injection molded parts. It was found
that the melt fill pressure, melt temperature, and short shot size were the dominant parameters affecting water penetration behavior.
Material at the mold-side exhibited a higher degree of crystallinity than that at the water-side. Parts molded by gas also showed a higher
degree of crystallinity than those molded by water. Furthermore, the glass fibers near the surface of molded parts were found to be ori-
ented mostly in the flow direction, but oriented substantially more perpendicular to the flow direction with increasing distance from the
skin surface.
2006 Elsevier Ltd. All rights reserved.

Keywords: Water assisted injection molding; Glass fiber reinforced poly-butylene-terephthalate (PBT) composites; Processing parameters; B. Mechanical
properties; Crystallinity; A. Polymer matrix composites; Processing

摘要：本报告的目的是通过实验研究聚对苯二甲酸丁二醇复合材料水辅注塑的成型工艺。实验在一个配备了水辅注塑统的80吨注塑机上进行，包括一个水泵，一个压力检测器，一个注水装置。实验材料包括PBT和15%玻璃纤维填充PBT的混合物以及一个中间有一个肋板的空心盘。实验根据水注入制品的长度的影响测得了各种工艺参数以及它们的机械性能。XRD也被用来分别材料和结构参数。最后,作了水辅助和气体辅助注塑件的比较。实验发现熔体压力,熔融温度，及短射类型是影响水注塑行为的决定性参数。材料在模具一面比在水一面展示了较高的结晶度。气辅成型制品也要比水辅成型制品结晶度高。另外，制品表面的玻璃纤维大部分取向与流动方向一致，而随着离制品表面距离的增加，越来越多的垂直与流动方向。
关键词：水辅注塑成型，玻璃纤维增强PBT，工艺参数，机械性能，结晶，

An experimental study of the water-assisted injection molding of
glass fiber filled poly-butylene-terephthalate (PBT) composites

Shih-Jung Liu *, Ming-Jen Lin, Yi-Chuan Wu
Polymer Rheology and Processing Lab, Department of Mechanical Engineering, Chang Gung University, Tao-Yuan 333, Taiwan
Received 12 September 2005; received in revised form 29 June 2006; accepted 11 September 2006
Available online 7 November 2006

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