Difference between revisions of "Chemical wood pulp"
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Paper pulp made from chemically treated wood fibers. Chemical pulp is produced by treating debarked, ground wood with strong solutions to dissolve the lignin. The undissolved cellulose fibers are washed, rinsed, sometimes bleached, then used to produce paper. The three main types of solutions used to make chemical pulp are: | Paper pulp made from chemically treated wood fibers. Chemical pulp is produced by treating debarked, ground wood with strong solutions to dissolve the lignin. The undissolved cellulose fibers are washed, rinsed, sometimes bleached, then used to produce paper. The three main types of solutions used to make chemical pulp are: | ||
| − | - alkaline: [ | + | - alkaline: [[sodium sulfide]] followed by [[sodium hydroxide|caustic soda]] solution (kraft process), |
- alkaline: caustic soda (soda process), | - alkaline: caustic soda (soda process), | ||
| − | - acid: [ | + | - acid: [[calcium bisulfite|acid bisulfite]] (sulfite process). |
[[File:100_Chem. softwood_conif_pol adj.jpg|thumb|Chemical hardwood (non-coniferous)]] | [[File:100_Chem. softwood_conif_pol adj.jpg|thumb|Chemical hardwood (non-coniferous)]] | ||
| + | |||
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
Revision as of 18:58, 12 January 2014
Description
Paper pulp made from chemically treated wood fibers. Chemical pulp is produced by treating debarked, ground wood with strong solutions to dissolve the lignin. The undissolved cellulose fibers are washed, rinsed, sometimes bleached, then used to produce paper. The three main types of solutions used to make chemical pulp are:
- alkaline: Sodium sulfide followed by caustic soda solution (kraft process),
- alkaline: caustic soda (soda process),
- acid: acid bisulfite (sulfite process).
Synonyms and Related Terms
chemical pulp; woodfree pulp
Other Properties
Produces a pale blue-violet to red violet response to iodine-zinc chloride solution.
Additional Images
Chemical softwood (coniferous)
Chemical softwood (coniferous)
Authority
- Encyclopedia Britannica, http://www.britannica.com Comment: "Paper Pulp." Encyclopædia Britannica. 2003. 11 Sep, 2003 .
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 574
- The Dictionary of Paper, American Paper Institute, New York, Fourth Edition, 1980
- E.J.LaBarre, Dictionary and Encyclopedia of Paper and Paper-making, Swets & Zeitlinger, Amsterdam, 1969
- Boise Cascade Paper Group, The Paper Handbook, Boise Cascade, Portland OR, 1989
- Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
- Silvie Turner, Which Paper?, Design Press, New York, 1991