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乳液在工业中有着广泛的应用，传统的制备乳液的方法多种多样，但主要采用的方法是机械搅拌或高压分散，这种方法能耗大，制乳效果差，制得的乳液液滴不均匀。膜法制乳的方法是靠膜两侧的压差使分散相以微小液滴的形式通过微孔膜，并分散在连续相中，从而形成乳状液。这种方法所需压力很小，形成的液滴直径均一，并能形成不同粒径的乳液，是理想的制乳方法。膜法制乳受膜材料、膜孔径、压差和表面活性剂等因素的影响。
Emulsion has a wide range of applications in the industry, the traditional methods of preparation of emulsion varied, but the main method used is mechanical stirring or high pressure dispersion, this method energy consumption, poor milk system, the emulsion droplets produced Evenly. Membrane milk method is based on the differential pressure across the membrane so that the dispersed phase in the form of tiny droplets through the microporous membrane and dispersed in the continuous phase to form an emulsion. The pressure required for this method is small and the resulting droplets are uniform in diameter and capable of forming emulsions of different particle sizes, making the method ideal for making milk. Membrane milk membrane material, membrane pore size, pressure and surfactant and other factors.