F - Mech Eng,Light,Heat,Weapons – 42 – B
Patent
F - Mech Eng,Light,Heat,Weapons
42
B
102/18, 86/3
F42B 5/18 (2006.01) C06B 45/12 (2006.01) F42B 5/188 (2006.01)
Patent
CA 1273241
ABSTRACT OF THE DISCLOSURE This invention concerns the field of combustible or semi-combustible cases intended in particular for artillery ammunition. More precisely, the invention concerns combustible cases bodies obtained by spirally winding combustible paper tapes containing nitrocellulose and having an improved mechanical resistance relative to previous combustible tape bodies, thanks to the fact that the combustible paper tapes form three distinct coaxial layers in terms of their density and structure. The case bodies according to the invention are obtained by spiral winding around a mandrel, a sheet consisting of an uncalendered combustible paper tape and six calendered combustible paper tapes with density between 0.9 and 1.2 g/cm3, the tapes being pasted to each other according to a helical angle ? such that the helical pitch P is larger than the width wl of the tape which thus forms a helix with turns which are not joined together. A calendered combustible paper tape previously pasted with density lying between 1.15g/cm3 and 1.3g/cm3 is then spirally wound around the tube thus formed according to a helical angle .beta. such that the turns of the helix formed by the tape overlap. The tube thus formed is then cut to the desired length for the case body.
468084
Brasquies Alain
Maures Michel
Brasquies Alain
Goudreau Gage Dubuc
Maures Michel
Societe Nationale Des Poudres Et Explosifs
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