Apparatus for molding plastic products
US4681525A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 23, 1985 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Sep 23, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C49/22
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Apparatus for molding plastic products of virtually any complicated configuration is provided. When a parison is extruded out of a nozzle, a separating agent, preferably oil, is supplied into the parison as a lubricant. Since a thin film of the separating agent is formed on the inside surface of the parison, portions of the inside surface do not stick together even if they are brought into contact from some reasons. This insures to mold a plastic product of a very complex configuration. Use of a separating agent also allows to form sheet-type products by dividing the parison into several sections as desired. This is a very efficient way of forming sheet-type products since at least two may be formed at the same time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.