| 摘要 |
PROBLEM TO BE SOLVED: To eliminate flapping just after a printing paper is passed through blanket drums, prevent the generation of delamination and improve the printing quality by blowing air on the surface of the printing paper so that the looseness of the printing paper is eliminated just after having passed through the blanket drums in an offset rotary printing machine. SOLUTION: In delamination preventing devices 19a and 19b, air is blown onto the surface of a printing paper 5 so that the looseness of the printing paper is eliminated just after the printing paper 5 has passed through blanket drums 11a, 11b, 12a and 12b of respective printing units, and the devices are provided at the rear of respective printing units. Respective delamination devices 19a and 19b are provided with air nozzles 23 and 24 facing the printing paper 5 just after having passed blanket drums 11a and 11b, and the air nozzles are provided with slit-shaped openings 25 crossing orthogonally the driving direction of the printing paper 5, and air is fed from an air feed box 26. Ventilation pipes 29, 29 are provided between the air nozzles 23, 24 and the air feed box 26, and air flow rate control valves 30 are provided on respective ventilation pipes 29. |
