Printing quality control method and system for relief printing press

Abstract

Printing quality control method and system for a relief printing press which enable a reduction in a burden of the operator by enabling automatic adjustment of nip pressures and a printing pressure, and a reduction in costs by reducing the number of waste sheets to be produced, the relief printing press including: a first rotor, such as an ink form roller (1), to which ink is supplied; a second rotor, such as a plate cylinder (3), to which the ink is supplied from the first rotor (1); and adjustment means, such as a motor (9), for adjusting, for example, the nip pressure between the first rotor (1) and the second rotor (3). The width of a line portion printed on paper (W) by the relief printing press is measured by using a line-width measuring camera (44), and the adjustment means such as the motor (9) is controlled on the basis of the line portion width obtained by the line-width measuring camera (44).

Description

technical field [0001] The invention relates to a printing quality management method and device for letterpress printing machines Background technique [0002] In the past, in letterpress printing, in the case of the usual offset printing method, due to the clamping pressure (contact pressure) between the ink form roller and the plate cylinder, between the plate cylinder and the rubber cylinder, and between the rubber cylinder and the impression cylinder ) and printing pressure changes, in the case of the direct printing method, due to the clamping pressure (contact pressure) and printing pressure between the ink form roller and the plate cylinder, between the plate cylinder and the impression cylinder and the change of printing pressure, on both sides In the case of the printing method, coupled with the change of the clamping pressure (contact pressure) between the rubber impression cylinder and the rubber cylinder, these will cause the ink to overflow to the periphery of t...

AI Technical Summary

Problems solved by technology

[0007] Therefore, in the past, the operator had to repeat printing many times, check the printed material, and adjust each clamping pressure and printing pressure. This not only increased the burden on the operator, but also because the operator made the adjustment intuitively, so Adjustment errors will cause quality fluctuations and produce a large number of damaged paper, resulting in increased costs

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