Multi-stage AP mechanical pulping with refiner blow line treatment
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United States of America Patent
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Jul 10, 2012
Grant Date -
Oct 21, 2010
app pub date -
Mar 26, 2010
filing date -
Jul 19, 2001
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Abstract
The invention combines the step of adding chemicals such as alkaline peroxide to an intermediate line after refining, with the step of applying chemicals such as alkaline peroxide as a pre-treatment before primary refining and/or applying chemicals such as alkaline peroxide at the primary refiner. This is implemented in the preferred embodiment, by pre-treating feed material, refining the materials into a pulp in a superatmospheric refiner, and adding chemicals in the post refining blowline.
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