Apparatus for molding a plastic closure with air-assisted ejection
US7255824B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2005 |
| Grant date | Aug 14, 2007 |
| Priority date | — |
| Expiry date | Feb 15, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/565
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for molding a plastic closure includes a male mold assembly including a forming pin and an outer pin sleeve which cooperate with a female mold for defining a mold cavity. To facilitate mechanical stripping of a molded closure from the forming pin, pressurized air is introduced into the molded closure through at least one air passageway which extends axially between the forming pin and pin sleeve. By outwardly expanding and forming the plastic closure during ejection from the forming pin, forces to which the closure is subjected during ejection are significantly reduced, thereby desirably reducing the amount of cooling of the closure that is required during the molding cycle prior to ejection. Significantly increased operating speeds for the compression molding apparatus can thus be achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.