Behavior of Water-Based Flexographic Inks in Newsprint Deinking, 1992 Pulping Conference Proceedings
This paper investigates the behavior of water based flexo inks in the deinking process as it applies to newsprint deinking. The results are compared with conventional offset newsprint deinking process.
Benchscale trials are performed to study the influence of major deinking unit operations such as pulping, flotation and washing on the deinkabiity of flexographic newsprint. The response of various flexographic - offset newsprint blends to conventional deinking methods is also reviewed. Bench trials concluded that washing is an important unit operation required in the deinking system for the removal of flexographic inks.
Pilot plant trials performed using various types of washer on furnish containing 25% flexographic inks concluded that fiber web network during washing is a critical factor for washer performance. Highest performance is achieved for a washer operating under no mat formation conditions. Theoretical particle removal efficiencies of various washers are compared to actual data obtained from field trials to confirm the results of pilot plant trials.