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May 1, 2020 · In this paper, we present a review of pulping technologies to convert logs or wood chips and non-woody materials into pulp for use in papermaking which consist of mechanical, chemical and semi-mechanical.
- K F Rullifank, M E Roefinal, M Kostanti, L Sartika, Evelyn
- 2020
- Overview
- Processes for preparing pulp
Mechanical or groundwood pulp is made by subjecting wood to an abrading action, either by pressing the wood against a revolving grinding stone or by passing chips through a mill. The wood fibres are separated and, to a considerable degree, fragmented.
Chemical wood pulp is made by cooking wood chips with chemical solutions in digesters operated at elevated temperature and pressure. The chemicals used are (1) sulfite salts with an excess of sulfur dioxide and (2) caustic soda and sodium sulfide (the kraft process). The lignin of the wood is made soluble, and the fibres separate as whole fibres. Further purification can be accomplished by bleaching. Chemical wood pulp that is purified both by bleaching and by alkaline extraction is called alpha or dissolving pulp. It is used for specialty papers, for rayon and cellulose film production, and for cellulose derivatives, such as nitrate and acetate.
Mechanical or groundwood pulp is made by subjecting wood to an abrading action, either by pressing the wood against a revolving grinding stone or by passing chips through a mill. The wood fibres are separated and, to a considerable degree, fragmented.
Chemical wood pulp is made by cooking wood chips with chemical solutions in digesters operated at elevated temperature and pressure. The chemicals used are (1) sulfite salts with an excess of sulfur dioxide and (2) caustic soda and sodium sulfide (the kraft process). The lignin of the wood is made soluble, and the fibres separate as whole fibres. Further purification can be accomplished by bleaching. Chemical wood pulp that is purified both by bleaching and by alkaline extraction is called alpha or dissolving pulp. It is used for specialty papers, for rayon and cellulose film production, and for cellulose derivatives, such as nitrate and acetate.
In the paper making industry process, the journey from pulp to perfection is a meticulous process that involves several stages to ensure the production of high-quality paper products. It begins with the creation of pulp, where wood fibers are extracted from raw materials such as softwood and hardwood trees.
Jun 18, 2020 · In this paper, we present a review of pulping technologies to convert logs or wood chips and non-woody materials into pulp for use in papermaking which consist of mechanical, chemical and...
The pulping process is aimed at removing lignin without loosing fiber strength, thereby freeing the fibers and removing impurities that cause discoloration and possible future disintegration of the paper.
Pulp and paper mills are highly complex and integrate many different process areas including wood preparation, pulping, chemical recovery, bleaching, and papermaking to convert wood to the final product.
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Introduction to Key Concepts: Wood Raw Material, Kraft Pulping Process, Sulfite Pulping Process, and Hybrid Pulping Methods. Pulp is largely dependent on the wood material, which undergoes a number of processes to satisfy the needs of the business.
