Mold device, easy-open end, method of manufacturing easy-open end, and laminated steel sheet for easy-open end
US7871230B2 · kind B2 · utility
0Cited by
8References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 22, 2004 |
| Grant date | Jan 18, 2011 |
| Priority date | — |
| Expiry date | Dec 25, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31681
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The mold apparatus has a pair of upper and lower molds being used for forming a score on one side surface of an easy-opening can end fabricated by a laminated metal sheet. The upper mold has a convex part for forming the score, and the cross sectional shape of the convex part at the portion contacting the laminated metal sheet is composed of a curve having a change rate of inclination of 0.08 or smaller to the upper surface of the facing lower mold, or having the curve and a straight line. The formed score has a maximum width of 0.80 mm or smaller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.