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基于压差控制气体流速的限流式超临界流体输送形式是微孔注塑发泡设备的一种常用手段。这一控制方式每次在气体注射器打开瞬间存在初始气涌,初始气涌会严重破坏单项溶液的制备质量。通过设计实验定量研究了初始气涌量与超临界流体压力和熔体体压力形成的压差之间的关系,拟合出初始气涌量与压差之间的关系式,并通过实际注塑发泡制品对预测值进行验证。
The flow-through type of supercritical fluid delivery based on differential pressure control gas flow rate is a common means of micro-hole injection molding foaming equipment. Each time this control is in place there is an initial surge of gas at the moment the gas injector is turned on. The initial gas surge can severely damage the preparation quality of the individual solutions. Through the design experiment, the relationship between the initial gas surge volume and the pressure difference between the supercritical fluid pressure and the melt pressure was quantitatively studied, and the relation between the initial gas surge volume and the pressure drop was fitted out. Through the actual injection molding Bubble products to predict the value of validation.