... board production line 1,full automatic in cheap price 2,different modle size 3,3 layer , 5 layer or 7 layer Corrugated board ... production line in 3' 5' 7 layerA. Main technical ... are used when the 1st testing of the production line. 7 Lubricating oil, consistent lubricant, machine oil ... advanced, 70%TT before delivery. corrugated board production line for sale