Polyethylene foamed sheet (film), also named as pearl cotton, is a kind of new-type packing materials with the features of damp proofing, shockproof, sound insulation, heat preservation and good plasticity. It is an ideal substitute of traditional packing materials and used widely in the wrappings of electronic product, daily necessities, glass, pottery, electrical household appliances, spraying, furniture, hardware product, toy, etc.