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US 8,617,328 B1Granted
Foamed celluloid mortar propellant increment containers
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsMing-Wan Young, Costas G. Gogos, Niloufar Faridi, Linjie Zhu, Peter Bonnett, Howard Shimm, Elbert Caravaca, Joseph Palk, Jr.
Life of this patent
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Abstract
An economical, low residue, mortar increment propellant container manufactured of foamed celluloid, which is composed of 50 to 84% nitrocellulose, having a nitrogen content of from about 10.5 to about 13.5%, and about 15 to about 50% camphor. The burn rate of the foamed celluloid can be enhanced by the addition of energetic additives, such as energetic plasticizers.
Claims11
A low residue mortar increment container comprising:
- foamed celluloid containing about 50% to about 84% nitrocellulose, having a nitrogen content of from about 10.5% to about 13.5%, and about 16% to about 50% camphor.
A method of manufacture of low residue mortar increment containers (MICS) comprising:
- (a) combining in a heated mixer about 50 weight % nitrocellulose, having a nitrogen content of from 10.5 wt. % to 13.5 wt. %;
- with about 15 wt. % camphor;
- with about 3% of a chemical blowing agent;
- and about 32% by weight of a solvent, to form a mixture;
- (b) agitating said mixture at about 30 rpm, for about 25 to about 35 minutes, at about 120 to about 125° F., until the mixture therein appears dough-like;
- (c) adding an additional quantity of solvent, about 25% of that originally solvent quantity, while increasing the rpm of the mixer to about 45 rpm, and increasing the temperature to about 150 to about 160° F.;
- (d) continuing to agitate for about another 30 minutes, thereafter decanting the mixer onto a flat surface, and placed the decanted mixture within a conventional heated press;
- (e) pressing the decanted mixture at 10,000 lbs of force, at about 160° F., until it sets up as a sheet, at the desired thickness of from about 0.1 to about 10 mm;
- (f) placing the sheet under vacuum over night to remove the solvent, thereby forming a dried sheet;
- (g) placing the dried sheet in an autoclave;
- (h) pressurizing the autoclave to, from about 250 psi to about 1,000 psi by the injection of a PBA, and raising the temperature in the autoclave to between about 250° F. and 350° F., for a period of from 90 seconds to 30 minutes, to form a sheet of foamed celluloid;
- (i) heating the sheet of foamed celluloid to a pliable forming temperature and then pressed into MIC half molds to form the respective generally u-shaped halves of the MIC;
- (j) joining two generally u-shaped halves to form a whole MIC, by vibration welding, application of a solvent, or a combination thereof.
10 more elements
A method of manufacture of low residue mortar increment containers (MICS) comprising:
- (a) combining in a heated mixer about 50 weight % nitrocellulose, having a nitrogen content of from 10.5 wt. % to 13.5 wt. %;
- with about 17 wt. % camphor;
- and about 33% by weight of a solvent, to form a mixture;
- (b) agitating said mixture at about 30 rpm, for about 25 to about 35 minutes, at about 120 to about 125° F., until the mixture therein appears dough-like;
- (c) adding an additional quantity of solvent, about 25% of that originally solvent quantity, while increasing the rpm of the mixer to about 45 rpm, and increasing the temperature to about 150 to about 160° F.;
- (d) continuing to agitate for about another 30 minutes, thereafter decanting the mixer onto a flat surface, and placed the decanted mixture within a conventional heated press;
- (e) pressing the decanted mixture at 10,000 lbs of force, at about 160° F., until it sets up as a sheet, at the desired thickness of from about 0.1 to about 10 mm;
- (f) placing the sheet under vacuum over night to remove the solvent, thereby forming a dried sheet;
- (g) placing the dried sheet in an autoclave;
- (h) pressurizing the autoclave to a pressure of from about 2,000 psi to about 12,000 psi, by the injection of a PBA, at a temperature between about 250° F. and about 350° F., for a period of from about 10 minutes to about 24 hours, thereby foaming the dried sheet to a foamed celluloid sheet;
- (i) removing the foamed celluloid sheet is removed from the autoclave;
- (j) heating the sheet of foamed celluloid to a pliable forming temperature and then pressed into MIC half molds to form the respective generally u-shaped halves of the MIC;
- (k) joining two generally u-shaped halves to form a whole MIC, by vibration welding, application of a solvent, or a combination thereof.
10 more elements
Dependencies are inferred from the claim text.