GB/T 13217.8-2009 "Test Method for Blocking Resistance of Liquid Inks" specifies the test method for evaluating the blocking resistance of printed coatings from liquid inks, applicable to various types of liquid ink products. The method involves placing a printed sample in contact with a clean substrate, applying a specified pressure, and maintaining it at a specific temperature. The degree of blocking is assessed by observing the adhesion upon separation. The test requires instruments such as a blocking resistance tester, a constant temperature oven, and a standard pressure roller, providing a technical basis for evaluating the reliability of ink after printing.