Apparatus for expanding mold cavities for making plastic articles with volume expanding agents
US6290486A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 16, 2000 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | May 16, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C44/586
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Molded plastic articles are prepared in accordance with the process and apparatus of the present invention. A first mold cavity is filled via a feeding unit in engagement with a first mold cavity with plastic containing a volume expanding agent, the filled first mold cavity and feeding unit are moved away from each other and a second mold cavity and the feeding unit are moved into engagement with each other, the second mold cavity is filled with plastic containing a volume expanding agent via the feeding unit, the plastic is expanded in the first mold cavity via the volume expanding agent while the second mold cavity is in engagement with the feeding unit, and the expanded article is ejected from the first mold cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.