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Process for joining a shell with a cartridge case

Image Number 2 for United States Patent #4359925.

An improved process for joining a shell having a plastic base portion to a cartridge case within a joining region. The joining region extends along a plastic base portion of said shell when it is inserted into the neck portion of the casing and has an upper and lower limit. The base portion is being axially inserted into the neck portion of the casing while being subjected to a relative rotational movement. A glueing or synthetic substance having flow capability is introduced into the neck portion of the casing. This plastic or glueing substance after hardening adheres more strongly to the inner surface of the neck portion than on said plastic base portion. The process includes making a groove in the plastic base portion extending at least partially between said upper and lower limit; dosing a predetermined region of said neck portion; thereafter axially introducing the plastic base portion of the shell into the neck portion while imparting a relative rotation thereto; transporting at least a portion of said dose of glueing or synthetic substance due to translational and centrifugal forces into the groove; and letting the synthetic or glueing substance harden therein.

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