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2-5 mm Thickness PVC Free Foam Board Low Density Conical Twin Screw Extruder, Find Details and Price about PVC Free Foam Board Production Line PVC Free Foam Board Extrusion Line from 2-5 mm Thickness PVC Free Foam Board Low Density Conical Twin Screw Extruder - Qingdao Sanyi Plastic Machinery Co., Ltd.