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Proceedings Paper

Chemical control of water penetration in paper
Author(s): Jonathan C. Roberts
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Paper Abstract

Paper makers use many different synthetic and natural chemical additives for a variety of different reasons during the wet formation process. They are used to influence the efficiency of the formation process or to impart specific sheet properties. They are usually added (with the exception of pigments) at a level of around 0-5% by weight of the other components of the furnish and, because of their relatively high cost, they often represent a significant proportion of the total raw material costs - particularly for recycled grades where the fibre costs may be very low. When it is necessary to modify bulk sheet properties, as in the control of aqueous fluid penetration (internal sizing), the chemicals have to be added to the wet fibre suspension so that they become well distributed throughout the z-direction of the sheet. Chemicals which are added as a surface treatment to the dry sheet are usually only able to influence surface properties.

Paper Details

Date Published: 4 August 1997
PDF: 20 pages
Proc. SPIE 3227, Interactive Paper, (4 August 1997); doi: 10.1117/12.280763
Show Author Affiliations
Jonathan C. Roberts, Univ. of Manchester Institute of Science & Technolgoy (United Kingdom)

Published in SPIE Proceedings Vol. 3227:
Interactive Paper
Graham G. Allan; Jean J. Robillard, Editor(s)

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