Recycled Furnish Strength Enhancement via Enzyme Application to the Refiners – Mill Trial Results, 19PaperCon
For years the papermaker has used mechanical refining to give fiber the qualities desired for the grade being produced. In many cases the refining operation is a balance between positive and negative qualities. Other considerations these days include the cost of power and the declining quality of several grades of recycled fiber. When refining alone can’t develop enough fiber strength to meet the required specifications, it is common to add or increase the amount of more expensive, higher strength pulp in the furnish. In addition, various strength chemicals may be employed with varying degrees of success. All of these avenues result in increased cost of production. In the last few years, the use of enzymes to give the papermaker desired fiber qualities has increased. The proper choice of enzyme can give targeted modification to the fiber. This allows the quality targets to be met with an overall reduction in cost of production. A fiber modifying enzymatic product supplied by Buckman was applied on a commercial recycle board machine in an effort to enhance strength properties of the final product without negatively impacting freeness and drainage on the wet end of the paper machine. Applied refining energy was not changed during the month‐long trial. Results from a lightweight 23# sheet were as follows: significant reduction in starch application with a small increase in Concora crush strength, slightly increased machine speed and slightly reduced basis weight while maintaining the remaining properties at relatively constant levels. Mill data were used to validate the results.
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Recycled Furnish Strength Enhancement via Enzyme Application to the Refiners – Mill Trial Results, 1