ASTM D7734/D7734M-13 Open Time of Oxidative Printing Inks

ASTM D7734/D7734M-13 Open Time of Oxidative Printing Inks

ASTM D7734-13 describes a finger transfer method for determining the stay open time of oxidative drying printing inks and overprint varnishes. A wet ink/varnish film is defined as open. Oil-based sheetfed offset, letterpress, and screen inks are examples of inks and overprint varnishes that dry through oxidation.


    It is critical to know the stay open time when creating printing inks and overprint varnishes that dry predominantly by oxidation so that premature drying does not occur. Other components of a printing press include rollers and other components.


    In ASTM D7734-13 the clearance gap is chosen that will result in a wet film thickness. A wide sample of the ink or overprint varnish is applied in front of the gap in the pulling direction with the applicator on the glass. The applicator’s sides are grasped with fingers and pressed down. A suitable amount of pressure is drawn down at a consistent rate. A timer is set for 1 hour. The condition of the film surface is checked at the conclusion of each time interval by touching a fingertip to the film and then to an adjacent clean piece of the glass next to the ink or overprint drawdown. When there is no ink or varnish transfer to the fingertip, the ink or overprint varnish film is deemed closed.

    Results are obtained from the open time for oxidative printing inks and overprint varnishes that are recorded during the test method.


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