초록 ▼

There is described a process for the continuous or semi-continuous fabrication of propellant powders for the production of a powder having reproducable characteristics, in extremely safe conditions, thus overcoming the disadvantages found in the existing batch processes. In accordance with the inven

There is described a process for the continuous or semi-continuous fabrication of propellant powders for the production of a powder having reproducable characteristics, in extremely safe conditions, thus overcoming the disadvantages found in the existing batch processes. In accordance with the invention, raw nitrocellulose is homogenised and stored under water in large tanks, from which it is fed in a controlled manner to a continuous centrifuge which removes water and alcoholises the nitrocellulose gradually. The alcoholised nitrocellulose is fed continuously to a stage where it is mixed with solvents and additives to form a gel which is compacted and extruded into filaments. Granules are made from the filaments and are transported in small batches to a preliminary drying step which removes that larger part of the solvents, in suitable vessels in a programmed manner. The granules discharged from these vessels are collected, in an inert state, and thereafter the powder is prepared and transported hydraulically to subsequent stages, including boiling and final drying.

대표청구항 ▼

Process for the production of propellant powders comprising the steps of: (a) storing homogenized nitrocellulose free of foreign bodies under water in storage tanks or silos; (b) feeding said nitrocellulose in aqueous suspension in a controlled and continuous manner to continuous centrifuge, where t

Process for the production of propellant powders comprising the steps of: (a) storing homogenized nitrocellulose free of foreign bodies under water in storage tanks or silos; (b) feeding said nitrocellulose in aqueous suspension in a controlled and continuous manner to continuous centrifuge, where the water is removed and the nitrocellulose is gradually and continuously alcoholized; (c) continuously feeding the alcoholized nitrocellulose to a mixer and mixing the nitrocellulose with solvents and additives to form a gel; (d) compacting and extruding the gel to form filaments; (e) cutting the filaments to form granules; (f) intermittently transporting small batches of the granules to a preliminary drying stage; (g) preliminarily drying the granules to eliminate the larger part of the solvent in suitable vessels, in a controlled manner; (h) intermittently discharging the vessels by means of a collector in which the granules are collected in an inert state; and (i) hydraulically transporting the powder thus prepared to subsequent stages, including boiling and final drying.