End cap for a propellant container

An end cap adapted to fit on one end of a tubular container for propellant material,

• the end cap comprising a deep drawn cup adapted to receive a propellant igniter means,
• the outer width dimension of the cup being less than the inner width dimension of the container,
• the cup having a flange engirding one of its ends,
• the cup being inserted into the propellant container to a depth permitted by the flange abutting a peripheral edge of the container,
• the excess material of the flange being rolled and crimped over the container peripheral edge for retention of the cup within the container,
• the cup having at its end opposite the flanged end a base wall having a centrally located aperture through which a signal from an igniter means is passable to ignite the propellant in the container,
• the aperture normally being sealed by a composite laminate of plastic film and metal foil that is rupturable upon occurrence of the igniter means signal,
• and a plastic annulus interposed between the igniter means and the laminate to protect the latter against frictional erosion by the igniter means by environmental vibrations transmitted to the propellant container.