Polypropylene foam sheet is featured by little energy consumption, small density, and great performance in shock resistance, thermal insulation and cold resistance. It is widely applied in food packaging, interlining of bags and suitcases, pass box, automotive interior, building templates and so on, with a good market prospect. The patented polypropylene microcellular foaming technique researched and developed by zeqi is utilized in pp foam sheet production line, effectively limiting the density of pp sheet to 0. 25-0. 50G/cm3.