Patent GB-370878-A (GB)
Title: Process for securing impermeability to more or less pulverulent materials
IPC: C04B20/10
Filed: 1930-10-09
Abstract: Pulverulent materials which are acted upon by liquid are proofed against such action by coating each particle of the material with a thin film of a substance insoluble in the liquid in such a manner that the film is destroyed by stirring the material.  The process may be applied to building materials such as lime, fireclay, and other earths, gypsum, and limestone.  The coating substance may be animal, vegetable, or mineral gums or oils, varnishes, lacs, resins, copal, solid or liquid paraffin, gelatine, glue, enamel, &c.  The coating may be effected by the aid of heat, with or without pressure, and by mixing the protecting substance with the material.  The protecting substance may be vaporized in order to apply it to the material. Lime, for example, is treated with a water-insoluble substance such as paraffin, so that it is protected from the action of water during storage or handling.  When the lime is mixed with sand or gravel, the film of paraffin is destroyed by friction.ALSO:Pulverulent materials which are acted upon by liquid are proofed against such action by coating each particle of the material with a thin film of a substance insoluble in the liquid in such a manner that the film is destroyed by stirring the material.  The process may be applied to organic food products such as grain, starch, and flour.  The coating substance may be animal, vegetable, or mineral gums or oils, varnishes, lacs, resins, copal, solid or liquid paraffin, gelatine, glue, enamel, &c. The coating may be effected by the aid of heat, with or without pressure, and by mixing the protecting substance with the material. The protecting substance may be vaporized in order to apply it to the material.ALSO:Pulverulent materials which are acted upon by liquid are proofed against such action by coating each particle of the material with a thin film of a substance insoluble in the liquid in such a manner that the film is destroyed by stirring the material. The process may be applied to schists or ores.  The coating substance may be animal, vegetable, or mineral gums or oils, varnishes, lacs, resins, copal, solid or liquid paraffin, gelatine, glue, enamel, &c. The coating may be effected by the aid of heat, with or without pressure, and by mixing the protecting substance with the material. The protecting substance may be vaporized in order to apply it to the material.ALSO:Pulverulent materials which are acted upon by liquid are proofed against such action by coating each particle of the material with a thin film of a substance insoluble in the liquid in such a manner that the film is destroyed by stirring the material. The process may be applied to building materials such as sand, lime, fireclay and other earths, gypsum, limestone, cement, puzzuolana, or to starch.  The coating substance may be animal, vegetable, or mineral gums or oils, varnishes, lacs, resins, copal, solid or liquid paraffin, gelatine, glue, enamel, &c.  The coating may be effected by the aid of heat, with or without pressure, and by mixing the protecting substance with the material.  The protecting substance may be vaporized in order to apply it to the material.  Cement or lime, for example, is treated with a water-insoluble substance such as paraffin, so that it is protected from the action of water during storage or handling. When the cement is mixed with sand or gravel, the film of paraffin is eliminated by friction.ALSO:Pulverulent materials which are acted upon by liquid are proofed against such action by coating each particle of the material with a thin film of a substance insoluble in the liquid in such a manner that the film is destroyed by stirring the material.  The process may be applied to organic food products such as seasonings, grain, starch, or flour. The coating substance may be animal, vegetable, or mineral gums or oils, solid or liquid paraffin or gelatine.  The coating may be effected by the aid of heat, with or without pressure, and by mixing the protecting substance with the material.  The protecting substance may be vaporized in order to apply it to the material.