Mold heater startup method
US5853631A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 1997 |
| Grant date | Dec 29, 1998 |
| Priority date | — |
| Expiry date | Dec 8, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2945/76943
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for mold heater startup and sequencing detects the heater zones associated with greater mass and allows them to heat up before zones of lesser mass, thereby reducing wear of the associated mechanical components and minimizing degradation of plastic material. The zones of smaller mass are kept at minimal temperatures until the zones with greater mass reach a set point. The system is capable of detecting multiple levels of thermal load and provides appropriate sequential startup of the identified thermal loads. The operator may also manually program the system to override certain automated sequences in order to ensure an optimal startup sequence. The sequencing of power application to large heaters also minimizes the peak current draw of the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.