... calendering roll, for plastic sheet extrusion production line roll sleeve, roller sleeve, for plastic sheet calendering roll, for plastic sheet ... curving...) Roll body material: Fine quality Seamless steal pipe, integrated forging 45# steel; 20# steel; 42CrMoA steel aloy, etc. ... Roll shaft material: 45 steel, integrate forging; Cooling water: big screw pitch, multi flow or cross twin ...