CHARGEMENT UNITAIRE FRAGMENTABLE DE POUDRE PROPULSIVE, CONTENANT UN LIANT AU NITRATE DE POLYVINYLE

CHARGEMENT UNITAIRE FRAGMENTABLE DE POUDRE PROPULSIVE AYANT LES PROPRIETES BALISTIQUES D'UN CHARGEMENT GRANULAIRE. UN TEL CHARGEMENT EST CONSTITUE DE:-85 A 97 DE GRAINS DE POUDRE PROPULSIVE A LA NITROCELLULOSE,-15 A 3 D'UN LIANT ENERGETIQUE, THERMOPLASTIQUE, SE PRESENTANT SOUS FORME DE PETITS GRAINS SOLIDES DANS LES CONDITIONS NORMALES ET AYANT LA COMPOSITION SUIVANTE:A)30A60DE NITRATE DE POLYVINYLE,B)70A40DE NITROCELLULOSE A FAIBLE TAUX D'AZOTE, OU D'ACETATE DE POLYVINYLE OU UN MELANGE DES DEUX,C)EVENTUELLEMENT UN STABILISANT.L'EMPLOI D'UN LIANT SOLIDE PERMET DE REALISER INSTANTANEMENT LE MELANGE HOMOGENE DE LA POUDRE PROPULSIVE AVEC LEDIT LIANT, LA MISE EN MOULE DE QUANTITES PRECISES DU MELANGE AINSI OBTENU, ET DE SIMPLIFIER LES OPERATIONS DE MOULAGE. Unit charge of propellant powder, which can be fragmented and has the ballistic properties of a granular charge. A charge of this type consists of 85 to 97% of grains of propellant powder containing nitrocellulose and 15 to 3% of a thermoplastic energy-producing binder which is in the form of small solid grains, under normal conditions, and has the following composition: (a) 30 to 60% of polyvinyl nitrate, (b) 70 to 40% of nitrocellulose having a low nitrogen content, or polyvinyl acetate or a mixture of the two, and (c) optionally, a stabilizer. The use of a solid binder makes it possible to mix the propellant powder with the said binder homogeneously and instantaneously, to introduce precise amounts of the mixture thus obtained into a mould and to simplify the moulding operations.