Due to the collision and impact of the plate cylinder and the impression cylinder during the process of conversion with the working surface, the cam, connecting rod and other mechanisms will vibrate under the action of inertia, and the working cylindrical surface of the cylinder no longer performs uniform speed and uniform rolling. Therefore, there will be slight slippage between the ink roller and the printing plate, between the plate cylinder and the rubber cylinder, and between the rubber cylinder and the impression cylinder, which will destroy the water-ink balance and affect the ink layer due to the cracking of the ink layer. The thickness causes the dot to increase or decrease, and a bar appears parallel to the axis of the drum. The higher the running speed of the machine, the more serious the bar phenomenon.
1. Design aspects
The arrangement position of the rollers is not reasonable. The reversing of the cross-ink rollers is not performed when the rollers are empty and when they are rolled. The wallboard and rollers are deformed due to insufficient strength and rigidity.
2. Accuracy
The assembly precision of gears, eccentric sleeves, rollers, etc. is not high, which affects the stability of mechanical movement.
3. Dynamic load
The effect of dynamic load on the ink stick is that the rotating parts rotate unbalanced, the mechanism reciprocates to generate vibration and the cam mechanism accelerates to cause impact. Related to the factors that produce the bar are imprinting, ink leveling, wetting part of the roller, bearing, roller gear, main transmission gear, ink roller gear, ink roller, rubber roller, water roller, paper delivery cam, Assembly and adjustment of racks and machine chassis. The accuracy errors formed by these components during printing are directly expressed in the form of a bar, so the severity of the bar is also an overall evaluation of the accuracy of the offset press.
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