Blank cartridges
A blank cartridge (1) has the front end (4) closed by a crimping operation carried out in two stages. In the first stage inner folds (8) are produced to leave a central opening of at least 2mm in diameter. In the second stage the inner folds are further compressed by exerting pressure on the outer f...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A blank cartridge (1) has the front end (4) closed by a crimping operation carried out in two stages. In the first stage inner folds (8) are produced to leave a central opening of at least 2mm in diameter. In the second stage the inner folds are further compressed by exerting pressure on the outer folds (7), by means of a conical die. |
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