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Technologies for Quality Improvement of the Injection Molded Polymer Products Utilizing the Heat Transfer Control Technique

利用传热控制技术提高注塑聚合物产品质量的技术

基本信息

批准号：
03555041
负责人：
KUROSAKI Yasuo
金额：
$ 10.18万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

The main purpose of this research project is to develop the technologies for improvement of the quality of injection molded polymer products by utilizing the heat transfer control techniques, Which have been used only for maintaining the mold wall temperature uniform. The obtained results can be summarized into the followings:1. Phenomena occurring in the Packing-Holding Process and Control of Sink Mark Location by Controlling the Mold Wall Temperature Distribution. First of all, the phenomena occurring in the packing-holding process, which is used to be applied for reducing the sink mark generation, were investigated by means of visualization. And then, the control technique of the sink mark location by controlling the mold wall temperature distribution was examined under the packing-holding process. So as to apply the control technique for the practical molding, we tried to control the mold wall temperature distribution by changing the mold wall materials, which have the different thermal diffusivities, and the effectiveness of this method was confirmed.2.Rheological Examination of the Generation of Residual Stress and Molecular Orientation within the Injection Molded Polymer Products. The residual stress and molecular orientation are strongly affected both by the generation rate, i.e., cooling rate, and by their relaxation during the cooling process. In the injection molded polymer products, the generation of residual stress and molecular orientation shows complicated behaviors, because the cooling rate of the polymeric material varies in the thickness direction. From this point of view, generation process of the residual stress and molecular orientation was examined with the rheological approach. The results showed that the residual stress and molecular orientation frozen in the molded polymer can be controlled by controlling the cooling conditions through the molding processes.

本研究项目的主要目的是利用以往仅用于保持模壁温度均匀的传热控制技术，开发提高注塑成型聚合物产品质量的技术。所得结果可归纳为以下几点：1。通过控制模壁温度分布来控制包封过程中出现的现象及凹痕位置。首先，采用可视化的方法研究了用于减少沉痕产生的填料-保温过程中出现的现象。然后，研究了在填料保持过程中通过控制模壁温度分布来控制凹痕位置的控制技术。为了将该控制技术应用于实际成型，我们尝试通过改变具有不同热扩散系数的模壁材料来控制模壁温度分布，并验证了该方法的有效性。注射成型聚合物制品中残余应力和分子取向产生的流变学研究。残余应力和分子取向受产生速率（即冷却速率）和冷却过程中的弛豫的强烈影响。在注塑成型的聚合物制品中，由于聚合物材料的冷却速度在厚度方向上的变化，残余应力和分子取向的产生表现出复杂的行为。从这个角度出发，用流变学方法研究了残余应力和分子取向的产生过程。结果表明，在成型过程中，通过控制冷却条件，可以控制成型聚合物中冻结的残余应力和分子取向。