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首页> 外文期刊>International Polymer Processing: The Journal of the Polymer Processing Society >Water Penetration Stability in Water Assisted Injection Molded Symmetric Ribs
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Water Penetration Stability in Water Assisted Injection Molded Symmetric Ribs

机译：水辅助注射成型对称肋的渗透稳定性

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摘要

Water assisted injection molding technology has received extensive attention in recent years,due to its light weight,relatively lower resin cost per pan,faster cycle time,and its flexibility in the design and manufacture of plastic parts.However,there are still some unsolved problems that confound the overall success of this technology.Unstable water penetration in molded symmetric channels is one of them.This report was to study the water penetration behavior in the water assisted injection molded symmetric cavity.Experiments were carried out on an 80-ton injection-molding machine equipped with a water injection unit.A plate cavity with symmetric water channels was used.The materials used were amorphous polystyrene and semi-crystalline polypropylene.Various processing variables were studied in terms of their influence on the water penetration behavior inside the symmetric parts:melt temperature,mold temperature,melt fill speed and fill pressure,short-shot size,water temperature and water pressure,and water injection delay time and water hold time.The effect of channel layout was also investigated.Tapered channels were found to mold parts with better penetration stability than flat channels.In addition,the penetration behaviors of water and gas in molded symmetric parts were also compared.The experimental results suggested that water penetration stability is more stable than that of gas in molded symmetric parts.
机译：水助注射成型技术由于其重量轻，每盘树脂成本相对较低，周期时间较短以及在塑料零件的设计和制造中的灵活性而受到了广泛的关注。然而，仍然存在一些未解决的问题其中一个就是成型对称通道中不稳定的水渗透。本报告旨在研究水辅助注射成型对称腔中的水渗透行为。在80吨注塑机上进行了实验。装有注水单元的成型机，使用具有对称水通道的板腔，使用的材料为非晶态聚苯乙烯和半结晶聚丙烯，研究了各种加工变量对对称零件内部透水性能的影响：熔体温度，模具温度，熔体填充速度和填充压力，短期尺寸，水温和水还研究了通道布局的影响。发现锥形通道比平通道具有更好的渗透稳定性。此外，水和气体在对称模压成型中的渗透行为实验结果表明，在对称成型件中，水的渗透稳定性比气体更稳定。

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