... . Good quality and service 3. Turn-key project plastic hollow grid board extrusion line 1. Widely used into daily life 2 ... , case and bag, postage, food industries. Advantages: The PP hollow grid board is light weight, non-toxic, pollution-free, water-proof ... is the special equipment for extruding LDPE/PP hollowness grid board. The grid board has the strong point of smooth and clean ...