EP 4135983 B1 20240410 - METHOD FOR CHECKING THE QUALITY OF PRINTED PRODUCTS
Title (en)
METHOD FOR CHECKING THE QUALITY OF PRINTED PRODUCTS
Title (de)
VERFAHREN ZUM KONTROLLIEREN DER QUALITÄT VON DRUCKPRODUKTEN
Title (fr)
PROCÉDÉ DE VÉRIFICATION DE LA QUALITÉ DE PRODUITS IMPRIMÉS
Publication
Application
Priority
- DE 102020123472 A 20200909
- EP 2021067489 W 20210625
Abstract (en)
[origin: WO2022053195A1] The invention relates to a method for checking the quality of printed products (01) which are produced successively in a specific production process by means of a plurality of printing machines. In this method: on each surface to be printed of each of these printed products (01) at least three printed images (03; 04; 06) are arranged spaced apart from one another with a spacing (A; B; C; D) which is fixed for this printed product (01); these at least three printed images (03; 04; 06) are each printed in printing processes which differ from one another; for checking the quality of the individual printed product (01), two printed images (03; 04; 06) which are printed in printing processes which differ from one another are selected by an inspection system in order to form a printed image pair; the printed image pair is assigned a spacing dimension which is fixed for the spacing (A; B; C; D) of the printed images (03; 04; 06) in said pair; before the start of the specific production process this spacing dimension is provided with a tolerance which is fixed according to the printing process used in the relevant printed image pair; the quality of the printed products (01) produced is checked in such a way that during the specific production process, by means of a computer unit of the inspection system, at least in the case of one sub-set taken from the set of all printed products (01) produced successively in the specific production process, in each case with the same printed image pair, a current value is determined for the particular spacing (A; B; C; D) between the printed images (01) selected for this printed image pair; the computer unit compares the currently determined value of each of the relevant spacings (A; B; C; D) with the spacing dimension fixed for this spacing (A; B; C; D), taking account of the associated tolerance, and a deviation of the currently determined value of each of the relevant spacings (A; B; C; D) from its fixed spacing dimension is determined, taking account of the associated tolerance.
IPC 8 full level
B41F 33/00 (2006.01); B41F 11/02 (2006.01); B41M 3/14 (2006.01)
CPC (source: EP US)
B41F 11/02 (2013.01 - EP); B41F 33/0036 (2013.01 - EP US); B41N 3/003 (2013.01 - US); B41P 2233/13 (2013.01 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
DE 102020123472 A1 20220310; EP 4135983 A1 20230222; EP 4135983 B1 20240410; US 11760082 B2 20230919; US 2023191775 A1 20230622; WO 2022053195 A1 20220317
DOCDB simple family (application)
DE 102020123472 A 20200909; EP 2021067489 W 20210625; EP 21736301 A 20210625; US 202117928650 A 20210625