发明名称 |
METHOD OF MAKING COMBUSTIBLE OBJECTS BY THE DEEP-DRAWING OF COMBUSTIBLE PAPER BLANKS BY MEANS OF A EXPANDING DIE AND DEVICE TO CARRY OUT THE METHOD |
摘要 |
The invention relates to the field of combustible ammunition and relates chiefly to the manufacture of bottoms or covers for combustible cases. According to the invention, a combustible article is manufactured by pressing in a die 10 at least one sheet 21 of combustible paper containing nitrocellulose and having the shape of a disc, by virtue of a rigid movable punch 20 exerting a compressive force on a deformable flexible punch 22 arranged inside the said die 10 between the sheets 21 and the said movable punch 20. The flexible punch 22 is in the shape of a substantially cylindrical thick disc, consists of neoprene or a silicone resin and has a hardness of between 55 and 65 Shore at 20 DEG C. The pressing operation is accompanied by a thermoforming operation carried out at approximately 115 DEG C. The process is particularly suitable for the production of bottoms of combustible cases bearing studs or grooves on their side faces. |
申请公布号 |
EP0238409(B1) |
申请公布日期 |
1991.11.06 |
申请号 |
EP19870400580 |
申请日期 |
1987.03.17 |
申请人 |
SOCIETE NATIONALE DES POUDRES ET EXPLOSIFS |
发明人 |
MAURES, MICHEL;BONNABAUD, THIERRY;GENDREAU, FRANCOIS |
分类号 |
B21D22/10;B31B43/00;F42B5/188 |
主分类号 |
B21D22/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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