| 摘要 |
<p>This invention relates to a safety device for sheet metal containers comprising an improved section of calibrated and even sheet metal with reduced thickness, and a breakaway section carved inside the improved section. The method comprises a preparatory phase that consists in submitting a determined area of sheet metal to a reduction of thickness through cold crushing, and an operative phase that consists in obtaining, through a further cold crushing phase, a groove that defines a breakaway area.</p> |
