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对由内包络体和大孔型控制释放膜构成的ＸＤ型膜包络体的释放过程进行了分析，推导了恒速段的传质模型。对控释曲线恒速段进行数学模拟。提出了膜结构参数ω，并对其数值确定方法进行了研究。
The release process of XD membrane envelope composed of inner envelope and macropore controlled release membrane was analyzed and mass transfer model was derived. The constant velocity section of controlled release curve is mathematically simulated. The membrane structure parameter ω is proposed and its numerical determination method is studied.