Method for producing aerosol can tops
US4290294A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 7, 1979 |
| Grant date | Sep 22, 1981 |
| Priority date | — |
| Expiry date | Mar 7, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D51/383
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of making the opening in aerosol can tops in two operations on a transfer press. One operation produces a score line on the upper radius of the pre-drawn cylindrical portion which compresses the material and permits a clean and burr-free separation. In the following station the disc is pulled radially towards the center, formed into a cup and ejected downwards. The fact that the material is being compressed in the scoring operation, that the edge thickness is equal to the original material thickness and that the edge of the opening is clean, smooth and free of burrs, permits the subsequent formation of the curl without the risk of splitting when using harder and less expensive material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.