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Bleaching Series (Details)Includes 11 courses for $499/year. Pulping Library (Details)Includes 72 courses for $1,499/year.
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Training Time: 31 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Polish, Russian
After wood chips are pulped, either by chemical or mechanical means, the resulting pulp has a brownish color. In order to create a white or lighter colored final product, the pulp much be bleached. This module provides a brief background on wood fibers and chemical pulping, and then provides information on what bleaching is and how it fits into the papermaking process.
At the end of this module, you will be able to:
The following key questions are answered in this module:
What is pulp bleaching?Bleaching is a series of chemical processes that increase the brightness of cellulosic pulps.
What is pulp brightness and how is it measured?Brightness is a measure used to tell how white the pulp appears. Brightness is measured by calculating the amount of blue light that reflects off the surface of a pulp handsheet sample. The higher the brightness, the whiter the pulp.
What are the chemicals used for pulp bleaching?Today, the most common bleaching chemicals are chlorine dioxide, oxygen, hydrogen peroxide, and ozone.
What is the difference between "bleaching" and "brightening"?Bleaching increases the brightness of pulp by removing lignin from the pulp. Brightening preserves and modifies lignin so it no longer appears brown. Brightening is usually temporary.
What does "Selectivity" of a bleaching chemical mean?Selectivity is used to measure how well a bleaching chemical will remove lignin without affecting the cellulose and hemicelluloses in the pulp. A more selective chemical will preferentially react with lignin. Chemicals with low selectivity will attack cellulose and reduce the strength of the bleached pulp.
Below is a transcript of the video sample provided for this module:
Chlorine Dioxide Awareness
View Course
Bleaching Equipment
Bleaching Sequences and Filtrate Recycling
Chlorine Dioxide Bleaching
Chlorine Dioxide Generation
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