Plastic and nonmetallic article shaping or treating: processes – Explosive or propellant article shaping or treating – Extrusion to form sheet or rod
Patent
1985-10-04
1987-06-02
Nelson, Peter A.
Plastic and nonmetallic article shaping or treating: processes
Explosive or propellant article shaping or treating
Extrusion to form sheet or rod
264 34, 264 36, C06B 2100
Patent
active
046702008
ABSTRACT:
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.
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patent: 4014655 (1977-03-01), Brunnberg
patent: 4120920 (1978-10-01), Cougoul et al.
patent: 4126497 (1978-11-01), Johnson et al.
patent: 4298552 (1981-11-01), Gimler
patent: 4444606 (1984-04-01), Bertrand et al.
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