... dryers, with internal and external machining, surface roughness ≤ 0.4, cylinder surface hardness HB ≥ 200, equipped with 3,113,156 bearing ... two cylinders are the box-type rack frame, the first cylinder is trislot base plate, the other one is single groove ... three–roller calendar.12. One set of Φ 900 × 1800 cylinder reeling machine, equipped with bearings 113528 and three Φ157 paper winding rolls ...