Offset printing presses used by sublimation heat transfer ink for offset occurs overprint error in the printing process, mainly from continued paper overlay error and transfer paper overlay error.
Monochrome printing press get on four-color printing, need to go through four continuous paper, each continuous paper is independent and is not affected by last one, if the sheet feeding error is 0.05mm, then any overlay error between two color printing on the print is 0.05mm. When four-color offset press get on color printing, need to go through a sheet feeding and three transfer paper, the error generated by continued paper only make the entire color image producing error in the location of the paper, it does not affect the overlay error between the colors. Overprint error sum constitute the actual overlay error between each color on the sheet in the transfer process between each printing unit and the paper.
Printing press overprint error not only related with precision machinery manufacturing, but also related with the machine during use of wear-related, it is an important indicator of the quality of the machine, press overprint error is an important project to press for acceptance testing. The faster printing speed, more severe vibration during operation, usually overprint error is greater.
