Drying process for casting powders

Details Drying process for casting powders Drying process for casting powders

1968-03-29

1979-10-30

Lechert, Jr., Stephen J.

Plastic and nonmetallic article shaping or treating: processes

Explosive or propellant article shaping or treating

Rolling to form sheet or rod

149 38, 149 42, 149 76, 149 92, 149 96, 149 97, 149 98, C06B 2100

Patent

active

041728661

ABSTRACT:
Process for removal of residual "processing" solvent from propellant casting powder particles, following their manufacture, which comprises "liquid drying" the particles by contacting them with an organic liquid miscible with the processing solvent but exhibiting substantially no solvent action for the powder particle ingredients with substantially no penetration of the particles. Normally liquid hydrocarbons are exemplary liquid drying solvents of which n-heptane and n-hexane are now preferred.
In preferred practice the liquid drying solvent is maintained in substantially complete wetting relationship with the particle surfaces until emplacement of the particles for casting. This eliminates safety hazards involved in conventional heat drying of the green powder and subsequent handling of the resulting dry material.

REFERENCES:
patent: 2554179 (1951-05-01), Fordham
patent: 3255281 (1966-06-01), Alexander
patent: 3311678 (1967-03-01), Brock et al.
patent: 3379796 (1968-04-01), Newson et al.

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