He covered the impression cylinder of a printing press with a rubber blanket and paper sheets were then fed incorrectly several times during a printing run.
The impression from the printing forme ended up on the rubber blanket and from there was passed on to the back of the sheet.
Rubel discovered that these misprints were of a better quality than the regular prints, and consequently went on to develop the first offset printing press.
www.heidelberg.comEr hatte den Gegendruckzylinder einer Druckmaschine mit einem Gummituch überzogen, und während eines Drucklaufs waren mehrmals Papierbogen versehentlich nicht angelegt worden.
Dadurch gelangte der Abdruck von der Druckform auf das Gummituch und von dort jeweils auf die Rückseite des nächsten Bogens.
Rupffestigkeit
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