| 摘要 |
1,146,854. Extracting flour and/or starch from tubers, roots &c. R. HEIN. 9 May, 1966 [18 May, 1965], No. 20523/66. Heading A2Q. [Also in Division C3] In extracting flour and/or starch from unpeeled parts of plants, such as cassava roots, Jerusalem artichoke roots, sweet potatoes, yams, arrowroot, colocasia roots, beetroots, turnips, carrots and bananas, the plant parts are mechanically reduced to coarse pieces, in the form of cubes, slices or shreds having a thickness between 0.5 and 2.0 cm., which are then rapidly dried, as by infra-red radiation and/or vacuum drying, and ground, or otherwise reduced, to yield particles having. a desired size which are finally sifted, or separated by classification, into particles of flour and/or starch and fibrous particles, e.g. peel or skin. The coarse pieces, before being dried, may be treated with a dilute acid, or a dilute mixture of acids, e.g. selected from: benzoic, formic, lactic, sulphuric and phosphoric acids; or with an aqueous solution of potassium chloride or sodium phosphate; or subjected to electric fields, electrophoresis, or ultra sonic waves, to coagulate any gums and mucilages, and inactivate any spoiling ferments or enzymes, which may be present. In treating water-soaked, unpeeled casssava roots in the apparatus shown in Figs. 1 and 2, the roots are cut into slices in a shredder 1, the slices are washed with water in a conventional washing drum 2, sorted on a table 4 to remove rotten and woody portions, cut into 0.8 to 1.0 cm. cubes in a conventional cutting machine 6, sprayed, if desired, with an aqueous solution of benzoic and formic acids (in which the ratio of benzoic to formic acid is 1 : 1 by weight) as the slices are being conveyed on a conveyer belt 7, then dried in a conventional belt-dryer 13, and finely ground in a drying and grinding mill 15, e.g. to yield particles 0.17Á in size. Fibrous matter is removed by a cyclone separator 16 and the resulting flour and/or starch is classified in a micro-classifier 17. |
