PRODUCTION OF GUDOL POWDERS

摘要

1458746 Propellants DYNAMIT NOBEL AG 29 March 1974 [3 April 1973] 14153/74 Heading C1D A propellant powder is prepared by mixing nitroguanidine with a water-containing composition comprising nitrocellulose and diglycol dinitrate, reducing the water content in a first drying stage, subjecting the mixture to a continuous kneading operation to effect homogenization and plasticizing, further reducing the water content in a second drying stage, subjecting the mixture to plasticizing and granulation in a continuously-operating screw press, adjusting the water content of the granulated product, and then compressing to a final powder form in a further continuouslyoperating screw press. The granulation stage may comprise extruding and cutting into small cylinders. The homogenization and granulation steps may be repeated. The final compression stage may be carried out in a multiple die extruder to produce propellant in the form of a pipe. Unidirectionally rotating double screw presses may be used for the granulation step and also for the final compression. In addition to the ingredients specified above, the propellant composition may contain MgO, graphite, methyl diphenylurea as a stabilizer, ethyl phenylurethane or diphenyl urethane as a plasticizer, candellila wax as a lubricant, and potassium nitrate as a muzzle flash reducing agent.