Improvements in the Treatment of Rice Flour with a view to its Substitution for various Starches used in Sizing and Finishing.

摘要

16,351. Soc. Anon. des Rizeries Franþaises. Aug. 1, A.D. 1903, [date applied for under Patents Act, A.D. 1901]. Sizes and similar finishes.-In order to render rice flour suitable for making paste or size for finishing or sizing paper, &c , alkaline, neutral, or acid substances are added thereto so that, on boiling the flour with water, the gluten casein which it contains is gelatinized or dissolved. (1) The flour is mixed in the dry state with a small quantity of caustic soda or potash and a sufficient quantity of boric acid to form a triborate with the alkali. When the mixture is boiled with water in the preparation of the size, the gluten casein is rendered soluble by the caustic soda &c., which is neutralized later by the slowly-dissolving boric acid. (2) Dry pulverized hyposulphite of soda is added to the flour, when, on boiling the mixture with water, the gluten casein passes into an extremely swollen condition. (3) The flour is sprayed with lactic acid, which may be replaced by another organic acid, such as tartaric or pectic acid. Mineral acids, such as hydrochloric or phosphoric acid, have the same effect but are not of use industrially.