To prepare a biodegradable cushioning packaging material poly( butyleneadipate-co-terephthalate) by melt extrusion,and its apparent density,thermal and cushioning properties were investigated. Methods range analysis of orthogonal experiment was used to optimize foaming process. Thermal and cushioning performance were studied by DSC,Fourier transform infrared spectroscopy and texture analyzer. Results show that the optimum foaming process was obtained as follow: the foaming agent 20%,the foaming temperature ...