ASTM D6073-08a(R2020) pdf free download

ASTM D6073-08a(R2020) pdf free download.Standard Test Method for Relative Setting of Heatset Printing Inks
1. Scope
1.1 This test method describes the procedure for determin- ing the relative setting speed of heatset inks using a tester consisting of a forced hot air oven and print delivery system. 1.2 This test method is applicable to printing inks intended to be dried by the application of heat and for which a suitable reference standard is available. 1.3 Although heatset inks are normally printed by the offset process, this test method specifies the direct letterpress mode because the higher ink film thicknesses obtained tend to amplify subtle differences in ink setting speed. Prints are prepared by a flatbed printing apparatus using a constant depth printing gage. 1.4 This tester reads temperature and belt speed in nonmet- ric terms; therefore, instrument settings in this test method are stated first in U.S. Customary Units (inch pound units of measurements). The values given in parentheses are for infor- mation only. 1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.7 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Summary of Test Method
4.1 A printing gage is used to prepare a laboratory print containing both the test sample and a standard ink. The freshly prepared print is immediately subjected to forced hot air in the tester, which is initially set at 350°F (177°C) and a belt speed of 30 fpm (0.15 m/s). 4.2 The print is cooled, overlaid with a clean sheet of stock, passed through the printing apparatus, and examined for setoff. 4.3 The process is repeated at different belt speeds or temperatures until either the test sample or the standard exhibits setoff and the other does not, or it is established that both are the same. The sample is then reported to dry faster than, slower than, or equal to the standard.
5. Significance and Use
5.1 The setting speed of heatset printing inks is important because it influences the efficiency of the drying process. This test method provides a means for comparing the setting of a heatset ink directly against a standard at the same conditions of temperature and exposure time. While the method does not determine the setting speed of an ink on a production press, it is useful for specification acceptance between the supplier and the customer. 5.2 The setting speed of a printing ink depends on a number ofvariables such as the substrate on which it is printed, the film thickness on the print, the temperature ofthe forced air, the rate of air flow, and the time that the print is subjected to heat. For these reasons, it is important to conduct the tests under conditions that are controlled and as realistic as practical.
6. Apparatus
6.1 Tester, equipped with a forced hot air oven and print carrier system consisting of heat resistant revolving belts that act as the print delivery system. The air temperature is adjustable between 100 and 600°F (38 and 315°C) and the speed of the print delivery unit between 0 and 100 fpm (0 and 0.5 m/s). The print delivery system allows the print to be exposed to hot air from the top and bottom at the same time.