Method for heat control of hot runner molds

Details Method for heat control of hot runner molds Method for heat control of hot runner molds

1985-05-10

1987-11-17

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling heat transfer with molding material

2643289, 26432814, 425144, 425548, B29C 4527, B29C 4578

Patent

active

047073101

ABSTRACT:
A method of controlling the heating of hot runner molds for injection molding of thermoplastic objects is disclosed, whereby the mold cavities (11, 12) receive the material to be molded via channels or runners divided into five heating zones (I through V), the temperature of each zone being controlled by means of an electric heating element (EC) associated with a thermocouple. In the event of failure of one zone's thermocouple, heat control is continued in said zone according to the power applied to the heating element of an adjacent zone.

REFERENCES:
patent: 3520026 (1970-07-01), Stidham et al.
patent: 3822867 (1974-07-01), Evans
patent: 3911251 (1975-10-01), Day

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