Thehollow grid board extrusion line is applicable to produce PC, PP, PE hollow grating board. The products are used widely in building, decorating, advertisement laying, road noise isolation and packing. PP hollow grating board has features like light weight, high strength, moisture-proof, antisepsis, etc. and can take place of carton as packing material. Width of the boards this line produces is 1100-2100 mm and thickness is 2-20 mm.