Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1981-05-11
1983-03-08
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
219530, 222146HE, 425549, 425566, H05B 306
Patent
active
043762441
ABSTRACT:
This invention relates to an integral heated probe for plastic injection molding and a method of making the same. The probe has an elongated steel outer body with a cylindrical well extending to a pointed tip end. An electrical cartridge heater member positioned in the well with the leads extending out the open end. The space adjacent the pointed tip end and all around the cartridge heater is filled with copper to improve heat transfer between the heater member and the outer body. The copper fusing is performed by two-stage heating in a vacuum furnace. First a slug of copper is inserted into the well and heated to melt it into the pointed tip end. Then the heater member is inserted into the well through a sleeve of copper at the top and heated to melt the copper. The copper flows down around the heater member and fuses to it, the outer body and the previously inserted copper. Melting the copper under a partial vacuum ensures that the copper flows into all the spaces displacing the air and fusion bonding to the heater member and the outer body to improve heat transfer between them.
REFERENCES:
patent: 4033485 (1977-07-01), Kohler
patent: 4279588 (1981-07-01), Gellert
patent: 4303382 (1981-12-01), Gellert
patent: 4304544 (1981-12-01), Crandell
patent: 4330258 (1982-05-01), Gellert
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