Process for extrusion of pyrotechnical compositions

Details Process for extrusion of pyrotechnical compositions Process for extrusion of pyrotechnical compositions

1976-09-20

1978-10-17

Miller, Edward A.

Plastic and nonmetallic article shaping or treating: processes

Explosive or propellant article shaping or treating

Rolling to form sheet or rod

149 96, 264 3B, C06B 2100

Patent

active

041209206

ABSTRACT:
Screw extruder and process utilizing same for the production of extrusions formed of compositions based on plasticized nitrocellulose. Process comprises at least one sequence of the following main operations carried out in corresponding zones in the extruder: (i) mixing and shearing the constituents of the composition to effect gelatinization thereof; (ii) retarding the forward movement of the composition by throttling; and (iii) drying the gelatinized composition by evaporation under a reduced pressure prior to extrusion of the composition from the outlet die of the extruder.

REFERENCES:
patent: 2926386 (1960-03-01), Hutchinson
patent: 3155749 (1964-11-01), Rossen et al.
patent: 3296043 (1967-01-01), Fluke et al.
patent: 3928514 (1975-12-01), Brachert et al.

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