Internationale technische Fachzeitschrift für Flexo- und - Saueressig

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Morphological assessment of the flexo printing in comparison to the gravure printing Flexo printing: 1) photopolymeric plate: PP, 2) Digisleeve: DS, 3) endless/seamless-sleeve: E/S-S, 4) gummed flexo forme: GFF Gravure printing: 5) gravure cylinder with journal steel base: GC/JSB, 6) gravure cylinder with hollow cylinder: GC/HC, 7) gravure sleeve: GS Flexibility of the printing forme in view of the configuration possibilities of the printed image Using of the base object for different circumferences Flexo printin g 1) PP 2) DS 3) E/S-S 4) GFF Gravure printing 5) GC/JSB 6) GC/HC 7) GS * The assessment in the morphological box will be made with plus signs. The number of plus signs describes only an average ranking of the individual printing formes types and their strengths + ++ +++ +++ ++++ ++++ ++++ The printed image in the flexo printing is always screened halftone. At the gravure printing forme, different, volume-variable engravings are possible: halftone configuration, variable area/variable depth configuration, continuoustone configuration and their mixed formes. More finely screen resolutions as in the flexo printing. Further using possibilities of the gravure printing forme are stylus gravure printing and the transfer of high colour volume per area unit, which is not possible for the flexo printing forme. ++ ++ + + +++ +++ +++ Flexo sleeves can only be used very limited in connection with an installation layer for changeable printing circumferences, as the most forme manufacturers do not have production machines for this or they prefer the new purchase. Gravure printing formes can always be adapted in certain tolerances for different printing circumferences due to the high wall strength (reduction of the wall strength) of the steel bases and the material precipitation (set-up of the wall strength). Printing quality + ++ +++ +++ ++++ ++++ ++++ The screen resolution of the printing subject is lay down limits for the flexo formes because of the small module of the used polymeric and the high relief depth. The gravure printing forme can obtain a more finely image resolution due to its low relief depth in combination with the high module of the metallic surface. This characteristic is especially interesting for high-quality printings. Only one part of the flexo printing formes is seamless. At the gravure printing the register accuracy is higher than at the flexo printing. Printing check + ++ ++ ++ +++ +++ +++ The photopolymeric plates are often not proofed. As a rule, a proof which is however not colourreliable is made for other flexo printing formes. In the gravure printing, delivery is almost
Printing costs per meter (print runs up to 40,000 meters) Printing costs per meter (print runs from 40,000 to 200,000 meters) Printing costs per meter (print runs from 200,000 to 1,000,000 meters) Development potential Sales proceed per meter printing carrier Profit per meter printing carrier (Western Europe) ++++ ++++ + +++ + + ++ exclusively made with colourreliable proof. Considerable advantages are arising at smaller printing runs for the most flexo printing formes – in comparison to the gravure printing – referring to the proportionate total costs. ++ ++ ++ ++ + + ++ For middle print runs, the difference between a flexo- and a gravure printing form referring to the proportional total costs becomes steadily smaller. On this occasion the photopolymeric plate has still advantages in comparison with all other procedures. + + ++ ++ ++ ++ +++ The higher the print runs, the more the gravure printing gains an advantage compared with the flexo printing forme. The high production security of the gravure printing forme in the printing process is paid off on this occasion. The gravure printing forme has also advantages for repeated orders as it has a higher form resistance compared with the flexo printing forme. + + ++ ++ + + ++ We assume that the flexo- and gravure printing forme will more and more come closer in relation to the production costs, sleeve use and printing quality. In the future, the production processes in the printing forme production will approach more and more. Direct structured surfaces by means of laser technology as well as faster illustration systems are the trend. The gravure printing sleeve will be successfully on the market. ? ? ? ? ? ? ? ? ? ? ? ? ? ?
Page 1 and 2: E 12044 13. Jahrgang · März 2002
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Internationale technische Fachzeitschrift für Flexo- und - Saueressig

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