基于正交试验的医用聚丙烯瓶胚注塑工艺优化研究

Research on Optimization of Medical Polypropylene Bottle Embryo Injection Molding Process Based on Orthogonal Experiment

摘要

本文基于正交试验，通过分析各因素对聚丙烯输液瓶壁厚影响，研究了医用聚丙烯瓶胚的注塑工艺，结果表明，影响医用聚丙烯瓶胚注塑因素依次为：主流道温度、熔胶时间、保压压力、填充时间、熔胶压力。正交试验表明，在主流道温度为220℃、熔胶压力为115MPa、熔胶时间为1.8s、保压压力为45MPa、填充时间为8.5s时得到的瓶胚具有较好的壁厚均匀度。使用最佳工艺参数制备的聚丙烯瓶胚平均壁厚为12.445-12.447mm，合格率达到94.6%-96.1%，与初步调试相比较，合格率提高3.5%，平均壁厚减小了0.03mm，从而使瓶胚达到吹瓶要求。采用医用聚丙烯R530A、RP260进行对比试验，两种医用聚丙烯制备的瓶胚中，医用聚丙烯RP260和R530A制备的瓶胚效果比较接近。

Abstract

This article is based on orthogonal experiments and analyzes the influence of various factors on the wall thickness of polypropylene infusion bottles to study the injection molding process of medical polypropylene bottle preforms. The results show that the factors affecting the injection molding of medical polypropylene bottle preforms are, in order: main channel temperature, melt adhesive time, holding pressure, filling time, and melt adhesive pressure. Orthogonal experiments showed that the preform obtained at a main channel temperature of 220℃, melt adhesive pressure of 115MPa, melt adhesive time of 1.8s, holding pressure of 45MPa, and filling time of 8.5s had good wall thickness uniformity. The average wall thickness of polypropylene preforms prepared using the optimal process parameters is 12.445-12.447mm, with a pass rate of 94.6%-96.1%. Compared with preliminary debugging, the pass rate has increased by 3.5%, and the average wall thickness has decreased by 0.03mm, thus meeting the requirements for bottle blowing. Comparative experiments were conducted using medical grade polypropylene R530A and RP260. Among the preforms prepared from the two types of medical grade polypropylene, RP260 and R530A showed similar effects.

关键词

医用聚丙烯 / 正交试验 / 瓶胚 / 优化 / 注塑工艺

Key words

medical polypropylene / orthogonal experiment / bottle embryo / optimization / injection molding process

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