Process for the manufacture of combustible articles by pressing combustible paper discs by means of a flexible punch
First Claim
1. Process for the manufacture of a dish-shaped combustible article (1) with circular external outlines and with cavities or protuberances, and particularly components for combustible cases or combustible containers, such as covers or bottoms, which consists of placing in the interior of a die (10) at least one sheet (21) of combustible paper containing nitrocellulose prepared from an aqueous suspension containing nitrocellulose by a paper making method, in the shape of a disc, wherein said die (10) consists of at least two splits (11, 12) and the inner side faces of the said splits (11, 12) are provided with protuberances or cavities (13, 14), placing a deformable flexible punch (22) on top of said at least one sheet of paper, applying a compressive force on said deformable punch by means of a rigid movable punch (20).
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Accused Products
Abstract
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° C. The pressing operation is accompanied by a thermoforming operation carried out at approximately 115° C.
The process is particularly suitable for the production of bottoms of combustible cases bearing studs or grooves on their side faces.
10 Citations
14 Claims
- 1. Process for the manufacture of a dish-shaped combustible article (1) with circular external outlines and with cavities or protuberances, and particularly components for combustible cases or combustible containers, such as covers or bottoms, which consists of placing in the interior of a die (10) at least one sheet (21) of combustible paper containing nitrocellulose prepared from an aqueous suspension containing nitrocellulose by a paper making method, in the shape of a disc, wherein said die (10) consists of at least two splits (11, 12) and the inner side faces of the said splits (11, 12) are provided with protuberances or cavities (13, 14), placing a deformable flexible punch (22) on top of said at least one sheet of paper, applying a compressive force on said deformable punch by means of a rigid movable punch (20).
Specification