Mold heater startup method

Details Mold heater startup method Mold heater startup method

1997-12-08

1998-12-29

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling heat transfer with molding material

26432814, 36447507, 425144, 425548, B29C 4574

Patent

active

058536310

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.

REFERENCES:
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patent: 4707310 (1987-11-01), Debeaud
patent: 4726751 (1988-02-01), Shibata et al.
patent: 5153007 (1992-10-01), Watkins
patent: 5280422 (1994-01-01), Moe et al.
patent: 5397515 (1995-03-01), Searle et al.
patent: 5456870 (1995-10-01), Bulgrin
patent: 5683633 (1997-11-01), Liehr

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