Advances in Flexographic Printing Inks Technology. A Re-solubility Study on BOPP film - (PPT)

摘要

We have developed a new, quantifiable test method using Banded anilox cylinders for comparing resolubility of water based ink formulations. Density measurements have proven to be effective for quantifying percent recovery of ink after drying. Formulations containing styrene, acrylic acid and a "base" tend to be "more" resoluble when there are more acid groups (and in turn more salt) present. Resolubility is more of an issue with-higher Ipi cylinders (600 Ipi, 2.5 bcm) than with lower Ipi cylinders (300, 4.8 bcm) for a given ink formulation: (1) because ink will completely dry in a smaller cell quicker than a larger cell (since there is less to dry); (2) Higher Ipi anilox cylinders are desirable for best quality. This test methodology helps us differentiate between our ink formulations and also helps us specify ideal anilox cylinders for selected applications. Good resolubility is key for high performing water based inks. Next: 1. Testing plate drying: (1) Halftones. 2. Testing to continue with higher Ipi anilox cylinders: (1) 700 through 1400 Ipi; (2) Improve abilities to differentiate ink formulations.