Sp series Three-layer co-extrusion machine it is widely used in packing industries as food,medicine,toy,gift,cloth,staionairy. Introduction: The SP series three-layers co-extrusion machine is specialized in producing kinds of plastic sheets of PP,HIPS,PE,PS,ect.it is available to makes proucts with various clrs of sheet and mixed plastic raw materials sheet through single layer,double layers, ...