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South African Pulp and Paper Industries Limited was founded in 1936. [9] The company is now known as Sappi and is headquartered in Johannesburg, [10] [11] It produces and sells commodity paper products, pulp, dissolving pulp, and forest and timber products for Southern Africa and export markets. [12]
Dissolving pulp is mainly produced chemically from pulpwood in a process that has a low yield (30 - 35% of the wood). This makes up of about 85 - 88% of the production. [2] Dissolving pulp is made from the sulfite process or the kraft process with an acid prehydrolysis step to remove hemicelluloses. For the highest quality, it should be derived ...
A special grade of bleached sulfite pulp is known as dissolving pulp [12] which is the raw material for a wide variety of cellulose derivatives, for example rayon, cellophane, cellulose acetate and methylcellulose. Rayon is a reconstituted cellulose fiber used to make many fabrics.
The pulp produced up to this point in the process can be bleached to produce a white paper product. The chemicals used to bleach pulp have been a source of environmental concern, and recently the pulp industry has been using alternatives to chlorine, such as chlorine dioxide, oxygen, ozone and hydrogen peroxide.
Chemical pulping involves dissolving lignin in order to extract the cellulose from the wood fiber. The different processes of chemical pulping include the Kraft process, which uses caustic soda and sodium sulfide and is the most common; alternatively, the use of sulfurous acid is known as the sulfite process, the neutral sulfite semichemical is treated as a third process separate from sulfite ...
Fluff pulp was first developed for use in disposable sanitary napkins. [2] Kotex's first advertisement for products made with wood pulp (Cellucotton) appeared in 1921. [3] Disposable diaper producers also were early to convert to fluff pulp because of its low cost and high absorbency. Normal usage of fluff pulp in a diaper was about 55 percent.
Pages in category "Pulp and paper companies of South Africa" ... Mondi; S. Sappi This page was last edited on 24 July 2019, at 19:03 (UTC). ...
Cacia Pulp and Paper Mill, [211] [212] Figueira da Foz Pulp and Paper Mill, Figueira da Foz [211] [213] Setúbal Pulp and Paper Mill, Setúbal [211] [214] Altri Celbi, Celulose Beira Industrial S.A, Figueira da Foz Caima-Indústria de Celulose S.A., Constância Celtejo, Empresa de Celulose do Tejo, S.A., Vila Velha de Ródão