【摘要】 研究了气辅注射成型制品气道内壁气/熔两相界面处蜂窝状气泡的形成机理。在气辅注射成型工艺过程中,高压N2达到了超临界状态,导致N2流体向熔融的聚合物熔体内部扩散,泄压后扩散到熔体中的N2流体达到过饱和状态,靠近气/熔两相界面的过饱和N2流体通过界面扩散逸出,剩下的N2流体就在聚合物熔体内部靠近内壁界面处形成蜂窝状气泡。并据此提出了如何减少气道内壁气泡缺陷的工艺条件。更多还原

【Abstract】 The formation mechanism of cellular gas bubbles inside the gas-melt interface on the gas channel wall for a gas-assisted injection molding（GAIM） part was studied.In the process of GAIM,the high-pressure gas such as N₂ comes to a supercritical state,diffusing into the polymer melt.After unloading the pressure,the N₂ in the polymer melt reaches a super-saturation state.The super-saturated N₂ close to the gas-melt interface diffuses through it,and the N₂ close to the internal wall delays to diffuse and remains in the polymer melt to form the cellular bubble blemish gradually.Based on this mechanism,optimization of molding process conditions to reduce the gas bubble blemish was proposed.更多还原