Method and apparatus for molding a closure cap
US4803031A · kind A · utility
67Cited by
9References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1984 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Mar 16, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/809
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved molded closure cap is described which has a softer sealing portion and a relatively hard closure engaging portion. The cap is molded using two differing plastics where the container engaging portion is molded of a softer seal-forming plastic and the remaining portion or shell is molded of a harder plastic. The novel molding apparatus and method employ plunger or die movement to facilitate a successive molding of the soft and hard cap portions without changing the molding plunger or die.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.