| Título: | Flocculation of cellulose fibre suspensions. |
| Autores: | Hubley, Charles Emerson. |
| Fecha: | 1949 |
| Publicador: | McGill University - MCGILL |
| Fuente: |
 |
| Tipo: | Electronic Thesis or Dissertation |
| Tema: | Chemistry. |
| Descripción: | When a suspension of cellulose fibres in water is shaken or stirred with sufficient violence to produce a uniform dispersion and allowed to come to rest, it is observed that the dispersion tends to become less uniform in distribution of fibres. This important but little understood phenomenon is termed “flocculation” by analogy to the coagulation of a colloidal dispersion. Flocculation is usually undesirable during certain stages in the process of paper making. If it occurs during or just prior to the forming of the sheet on the wire of the paper machine, the pulp fibres are distributed unevenly and a non-uniform sheet results. When a sheet has a very poor “formation”, the ink is not distributed uniformly over the surface of the paper during the printing process. This prohibits the use of the paper in services where good reproduction is required. The strength and general appearance of paper are also determined, in large measure, by the formation. It is therefore of extreme importance that the principles of cellulose fibre flocculation be determined so that they may be available to the paper maker. There are other instances in which a more thorough knowledge of the principles of flocculation would be of value. In fibre recovery systems it is desirable to promote flocculation. In producing dissolving-grade pulps of uniform permeability and swelling properties it is of considerable importance to have the fibres uniformly dispersed when the pulp sheets are formed.[...] |
| Idioma: | en |
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