以羟丙基交联淀粉为主要成膜基质,添加普鲁兰多糖、甘油和水等辅助剂,研究了挤压温度、螺杆转速以及水分含量对复合膜机械性能、水蒸气透过率以及热性能的影响。结果表明:在挤压温度140℃、螺杆转速30r/min、水分含量25%条件下,膜的综合性能较好,断裂伸长率,阻水系数优于普通膜,可以作为熔融挤出的合适参数。

The edible films were made mainly by hydroxypropyl distarch phosphate with pullulan,glycerol and water.Effects of extrusion temperature,screwing speeds and water content on the mechanical properties,water vapor permeability and thermal properties of the films were studied.The results indicated that,the comprehensive properties of the film was better under the conditions of extrusion temperature of 140℃,screwing speeds of 30rpm and water content of 25%.The elongation after the break and water vapor permeability were superior than the controls.Therefore,these conditions could be the optimal parameters during the melt-extrusion process.