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Title: Physico-chemical aspects of rosin emulsion sizing of paper
Author: Swales, Darren Keith
ISNI:       0000 0004 2738 8850
Awarding Body: Loughborough University
Current Institution: Loughborough University
Date of Award: 1992
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A study has been made on the mechanism of rosin sizing in papermaking. By using microelectrophoresis and laboratory prepared handsheets, a study of the effect of pH, certain metal salts, and various physical parameters on the overall electrokinetics and sizing efficiency of the system has been made. By the use of a novel sizing method it was possible to effectively size handsheets in the alkaline pH range, which had previously not been possible when using rosin dispersion sizes. This permitted the inclusion of calcium carbonate as a filler, which has particular advantages in the finished paper. Use of the theory proposed by Derjaguin-Landau-Verwey and Overbeek on colloidal interaction, made it possible to explain and predict the likely outcome of sizing experiments, by analysing the electrokinetics of the system components. A comparative study on the effect of rosin fortification and the stabilisation of the dispersions by the use of casein has been made. From the results obtained, fortification leads to an improvement in sizing, particularly if the drying of the paper is not very efficient. Whereas the interactions of casein primarily effect the stabilisation of the dispersion, protein desorption from the solid-liquid interface causes initial flocculation of the dispersion. If the desorption is kept to a minimum, the dispersion is still stable and an effective sizing agent.
Supervisor: Not available Sponsor: Roe Lee Paper Chemicals Co. Ltd.
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available