Process and apparatus for the evaluation of the printing quality

Details Process and apparatus for the evaluation of the printing quality Process and apparatus for the evaluation of the printing quality

1984-10-29

1987-05-12

Lall, Parshotam S.

Boots, shoes, and leggings

101335, 101365, 250559, 364552, G01J 346, B41F 3300

Patent

active

046654968

ABSTRACT:
Printed products and their respective corresponding printing plates are divided into a plurality of image elements. For each image element the surface coverage is determined by photoelectric measurements; a reference reflectance value is then calculated from these measurements, taking into consideration such parameters as the printing characteristic. These reference reflectance values are compared with the actual reflectance values measured on the printed products and the results of the comparison are evaluated to form a quality measure and to calculate control values for the ink feed devices of the printing machine. In this manner, the use of special color measuring strips may be eliminated.

REFERENCES:
patent: 3322025 (1967-05-01), Dauser
patent: 3958509 (1976-05-01), Murray et al.
patent: 4183657 (1980-01-01), Ernst et al.
patent: 4210818 (1980-07-01), Green et al.
patent: 4217648 (1980-08-01), Thurm et al.
patent: 4505589 (1985-03-01), Ott et al.
patent: 4535413 (1985-08-01), Shiota et al.
patent: 4553033 (1985-11-01), Hubble, III

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