... up to the thickness of 200mm, equipped with independent gear box and cardan drive with submerged lubrication system to avoid noise and ... corrugated roll is made of 52CrMo precision forging alloy steel, with the treatment of hardening and tempering, grinding, laser-quenching, ... tungsten carbide, make the hardness up to HVC1200.Equipped with spay wetness adjusting deivce to avoid paper cracking and keep ...