Improved pulp sheet formation
AssigneeDorset Industrial Chemicals Ltd.
InventorEdwin H. Flaherty
Life of this patent
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Abstract
The drainage of pulp sheet is improved by treatment of the pulp prior to entry to the sheet making machine with a composition comprising a suspension of finely-divided hydrophobic lubricating particles in a suitable carrier liquid. The invention has particular applicability to paper making wherein the smoothness and printability of the paper is improved and to pulp drying.
Claims2
In a method of forming a pulp sheet from an aqueous slurry of cellulosic fibrous material fibres, the improvement which comprises introducing to said slurry immediately prior to said sheet formation a composition in an amount effective to improve the formation of said paper sheet as formed, said composition being formed by mixing two separate mixtures A and B of the following compositions in the weight proportion of about 9:1 to about 1:9:
- ______________________________________ Mixture A hydrophobic silica about 6 to about 15% by weight hydrocarbon oil about 82 to about 88% by weight surfactant selected about 1 to about 2% by from the group weight consisting of anionic, cationic and non-ionic surfactants fumed silica about 0.1 to about 0.5% by weight Mixture B hydrophobic amide wax about 6 to about 10% by weight hydrocarbon oil about 85 to about 90% by weight silicone oil about 1 to about 2% by weight short chain aliphatic about 1.5 to about alcohol 3% by weight fatty acid ester of a about 1 to about 3% long chain fatty acid by weight and a lower alcohol surfactant other than about 1 to about 2% said silicone oil, short by weight chain aliphatic alcohol and fatty acid ester of a long chain fatty acid and a lower alcohol and selected from the group consisting of anionic, cationic and non- ionic surfactants. ______________________________________
A composition for improving the formation of a pulp sheet from an aqueous slurry of cellulosic material fibres which is formed by mixing two separate mixtures A and B of the following compositions in the weight proportion of about 9:1 to about 1:9:
- ______________________________________ Mixture A hydrophobic silica about 6 to about 15% by weight hydrocarbon oil about 82 to about 88% by weight surfactant selected about 1 to about 2% by from the group weight consisting of anionic, cationic and non-ionic surfactants fumed silica about 0.1 to about 0.5% by weight Mixture B hydrophobic amide wax about 6 to about 10% by weight hydrocarbon oil about 85 to about 90% by weight silicone oil about 1 to about 2% by weight short chain aliphatic about 1.5 to about alcohol 3% by weight fatty acid ester of a about 1 to about 3% long chain fatty acid by weight and a lower alcohol surfactant other than about 1 to about 2% said silicone oil, short by weight chain aliphatic alcohol and fatty acid ester of a long chain fatty acid and a lower alcohol and selected from the group consisting of anionic, cationic and non- ionic surfactants. ______________________________________
Dependencies are inferred from the claim text.