| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a positive pressure can which has an approximately smooth surface before unsealing and exhibits a three-dimensional form after unsealing by forming a polyhedral wall on a can barrel, and its manufacturing method. SOLUTION: The can comprises a can barrel formed by drawing and ironing a metallic plate and can lids or caps provided at an upper end of the barrel and a can bottom having an easy-to-unseal port. The can has, on at least a portion of the can barrel, component unit surfaces, border ridges where the unit surfaces are in contact with one another and intersections where the border ridges intersect with one another. The border ridges and the intersections protrude relatively outward from the can compared with the component unit surfaces. The surfaces have dents between the opposite intersections. In addition, a peripheral polyhedral wall is formed, where can body axis orientations adjacent in a peripheral direction of the unit surface exhibit a difference in phase. The dents of the surface swell due an internal pressure and form an approximately smooth surface where the polyhedral wall is exhibited when the can is filled with contents and the internal pressure of the can is applied. Once the can is unsealed, the polyhedral wall comprising the component unit surfaces is formed. Thus the positive pressure can formed with the polyhedral wall on its barrel and its manufacturing method are provided.</p> |
