石墨烯模具改善注塑制品表面“浮纤”缺陷的实验研究
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摘要
通过石墨烯辅助快速热循环技术研究了制品在成型过程中对模具型腔温度的控制。结果表明,提高模具型腔表面温度可降低模具表面与熔体温度差,减弱热交换,可使熔体能够保持较高的流动性,防止熔体充填时玻纤遇冷在表面淤积,从而有效改善聚丙烯表面"浮纤"状况;当模具型腔温度为120℃时,可完全消除制件表面的"浮纤"缺陷。
A temperature control for mold cavities was realized during injection-molding process by a graphene-assisted rapid heat cycle molding technology,and an intensive investigation indicated that the improvement of the surface temperature of mold cavities could reduce the temperature difference between mold surface and melt,and also resulted in a decrease in heat exchange.This made the melt have a low viscosity and prevented glass fiber depositing on mold surface when cooled.In this case,the glass fiber-floating phenomenon on the surface of injection-mold parts could be well prevented.Fiber-floating defects could be completely eliminated when temperature of the mold cavities was set to 120 ℃.
A temperature control for mold cavities was realized during injection-molding process by a graphene-assisted rapid heat cycle molding technology,and an intensive investigation indicated that the improvement of the surface temperature of mold cavities could reduce the temperature difference between mold surface and melt,and also resulted in a decrease in heat exchange.This made the melt have a low viscosity and prevented glass fiber depositing on mold surface when cooled.In this case,the glass fiber-floating phenomenon on the surface of injection-mold parts could be well prevented.Fiber-floating defects could be completely eliminated when temperature of the mold cavities was set to 120 ℃.
引文
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