Abstract
In Daishowa Honsha Mill. Fuji Division, we have 3 lines of DIP process which amount of product is 630t/d. The current High-Brightness-DIP process, start running from September 2000, makes it possible to brighten 75% of DIP.In here we have Sprit-Flotation System, which is first trial in Daishowa. This process is able to intensify ink rejecting by flotation cell, which set up in front and back of hydrogen peroxide bleaching.This system can discharge ink before it break up into minute particles, like less than 2μm. Therefore, it is effective for manufacturing high brightness DIP. Now, we use mixtured of old newsprint and old magazine, however, from the good result of our new process, we are able to make the best use of any waste papers.In this report, we will introduce system, operation experience and quality of our New-DIP-Process of this two years.
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