Static molds – Including electric heating means
Patent
1986-07-17
1989-01-03
Echols, P. W.
Static molds
Including electric heating means
425549, 29611, 29613, 219424, B22D 2702
Patent
active
047951265
ABSTRACT:
A unitary integral electrically heated nozzle device for plastic molding or die casting equipment which has a novel casing integral with a heater core, which is insulated to prevent conduction of electricity and loss of thermal transmission to the casing, the electrical insulation being compacted within the casing and around the heater core and the assembly being sealed and swaged into a unitary form, said device being structured to heat the area of a gate or passage for delivery of molten material into a forming cavity. The nozzle device may be shaped, and the nozzle systems include such nozzle devices in the gate channels for delivering molten material to the forming cavity.
The invention also includes a heated nozzle of the character referred to wherein at least a part of said electrical insulation comprises a layer of mica or cermaic insulator material having electrical resistance wire wound thereabout, and a method for making such a nozzle which includes the steps of winding electrical resistance wire about a strip of green insulator material, fitting the wire wound strip in a casing and insulating the wire from the casing, compressing the assembly and heating the compressed assembly.
The invention also includes a lead arrangement where the unitary nozzle is opened midway its ends to expose the wires and lead are connected sealed and insulated through the casing; and also included is a method for making such a lead arrangement.
REFERENCES:
patent: 3970821 (1976-07-01), Crandell
Echols P. W.
Fast Heat Element Manufacturing Co., Inc.
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