wood pulp
Quick Summary
Wood pulp is the raw material for making paper and other cellulose derivatives. It is primarily derived from the fibrous material of trees, with both softwoods and hardwoods contributing different qualities to the final product. Softwood fibers provide strength, while hardwood fibers offer smoothness and opacity.1
There are two main categories of wood pulp: mechanical and chemical. Mechanical pulping, also known as groundwood, involves grinding wood to separate fibers. Chemical pulping uses solutions like sulfite or alkaline chemicals (soda and sulfate/kraft) to dissolve lignin, the substance that binds wood fibers together, yielding purer cellulose fibers. Semichemical pulping combines chemical treatment with mechanical refining. Recovered paper is also a significant source of pulp.234
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paperOrigin and development…wetted to produce the paper pulp, or stock. The pulp is then filtered on a woven screen to form a sheet of fibre, which is pressed and compacted to squeeze out most of the water. The remaining water is removed by evaporation, and the dry sheet is further compressed and,…
Read More…wetted to produce the paper pulp, or stock. The pulp is then filtered on a woven screen to form a sheet of fibre, which is pressed and compacted to squeeze out most of the water. The remaining water is removed by evaporation, and the dry sheet is further compressed and,…
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papermakingImprovements in materials and processes…methods for manufacturing paper from wood pulp and other vegetable pulps. Several major pulping processes were gradually developed that relieved the paper industry of dependency upon cotton and linen rags and made modern large-scale production possible. These developments followed two distinct pathways. In one, fibres and fibre fragments were separated…
Read More…methods for manufacturing paper from wood pulp and other vegetable pulps. Several major pulping processes were gradually developed that relieved the paper industry of dependency upon cotton and linen rags and made modern large-scale production possible. These developments followed two distinct pathways. In one, fibres and fibre fragments were separated…
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- cellophane
…obtained in large quantities from wood pulp or cotton linters. In 1892 English chemists Charles F. Cross and Edward J. Bevan patented viscose, a solution of cellulose treated with caustic soda and carbon disulfide. Viscose is best known as the basis for the man-made fibre rayon, but in 1898 Charles…
Read More…obtained in large quantities from wood pulp or cotton linters. In 1892 English chemists Charles F. Cross and Edward J. Bevan patented viscose, a solution of cellulose treated with caustic soda and carbon disulfide. Viscose is best known as the basis for the man-made fibre rayon, but in 1898 Charles…
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nitrocelluloseComposition, properties, and manufacture of nitrocellulose…the commercial manufacture of nitrocellulose, wood pulp is the primary source of cellulose. Cellulose sheet and nitrating acids are fed into a reacting vessel, where nitration proceeds until the acids have been centrifuged from the nitrated product. Remaining acid is removed by washing the nitrocellulose slurry in water and boiling…
Read More…the commercial manufacture of nitrocellulose, wood pulp is the primary source of cellulose. Cellulose sheet and nitrating acids are fed into a reacting vessel, where nitration proceeds until the acids have been centrifuged from the nitrated product. Remaining acid is removed by washing the nitrocellulose slurry in water and boiling…
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