METHOD FOR EVALUATING PARTICLES IN PRINTING INK

摘要

PROBLEM TO BE SOLVED: To provide a simple method for inspecting and evaluating coarse particles in a printing ink with less human measurement errors at any stage of manufacturing processes of the printing ink. SOLUTION: The printing ink of a sample 1 is placed at a tip of a lower film made of a heat-sealable resin as a lower welding member 2 in a width of approximately 70-80% of the width of the film in such a way as not to extend beyond either side of the film, and an upper film of an upper welding member 3 is placed matching the lower film. By winding the films of the upper and lower welding members 2 and 3 between upper and lower heat rolls 5 and 6 previously set at an appropriate temperature and a speed, the ink is uniformly and thinly spread to create an evaluation sample 9. The presence or absence of particles 10 in the evaluation sample 9 is confirmed.