This chemical cooking dissolves the lignin, freeing the individual cellulose fibers to form a strong, flexible mat known as pulp. Paper made from mechanical pulp is often used for newspapers and magazines due to its low cost, though it tends to yellow and become brittle over time because the lignin remains.
Achieving Washing Lignin Free Paper Production Through Chemical Cooking
This is done using chlorine or oxygen-based chemicals to remove any residual coloring agents while maintaining the integrity of the fiber structure. The result is a continuous sheet of paper known as a "web," which is then wound onto a massive reel.
Coating and Finishing To enhance the printing surface, the paper may undergo a coating process. Wood chips are cooked in a solution of chemicals, such as sodium hydroxide and sodium sulfide, in a massive pressure vessel known as a digester.
Achieving Washing Lignin Free Paper Production with Chemical Cooking
Stage Key Purpose Primary Output Pulping Separate cellulose fibers from lignin Raw fiber mixture Refining Condition fiber flexibility and bonding Improved fiber quality. This process crushes the wood fibers without removing the lignin—the natural polymer that binds the cellulose together—resulting in a high yield of material.
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