QB/T 5488-2020 "Determination of Liquid ink composite strength" This standard specifies the determination method of Liquid ink composite strength, which is suitable for Liquid ink Spreader or printing on a non-absorbent flexible substrate (such as film, aluminum foil or plastic sheet), after passing the Adhesive composite strength test. The standard uses the T-type disbonding test method to determine the composite strength of the composite layer and the substrate by disbonding a sample of a specified width at a certain speed. Test conditions include temperature (23 +/- 2 ° C), relative humidity (50% +/- 10%), etc., designed to provide a unified test basis for the quality control and performance evaluation of inks composites.