Societe Nationale Des Poudres Et Explosifs

Jean Lucien Tranchant

Marc Saunier

Robert Omer Grebert

Jacques Picard

Pierre Cougoul

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.

Process for extrusion of pyrotechnical compositions

A screw extruder comprises a casing connected to a bed, the casing comprising two portions connected together longitudinally by connecting elements. At least one of the casing portions is articulated with respect to the bed, and the connecting elements are adapted to release the connection between the casing portions at a predetermined casing pressure to allow the casing portion to articulate to thereby open the casing.

Screw extruder

A composite propellant comprises, by weight:

Growing community of inventors

Vert le Petit, France

Jean Lucien Tranchant