Apparatus for pre-heating thermoplastic parisons
US4268975A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1980 |
| Grant date | May 26, 1981 |
| Priority date | — |
| Expiry date | Jan 28, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C49/648
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to an apparatus for effecting the uniform pre-heating of thermoplastic parisons of the type that are introduced into a blow molding machine for fabrication into a blow molded article. The invention provides a hopper which is intermittently supplied with batches of parisons and through which the parisons move by gravity. A convection heating zone is provided in the hopper to uniformly heat each parison passing therethrough, and a temperature equalization zone is provided adjacent to the heating zone. The parisons are removed from the temperature equalization zone by a continuously moving parison conveyor which forms part of the temperature equalization zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.