Glass annealing lehr having gas and electric heating means

Details Glass annealing lehr having gas and electric heating means Glass annealing lehr having gas and electric heating means

1975-03-24

1976-12-14

Kellogg, Arthur D.

Glass manufacturing

Product cooling means

With preceding reheater

65351, 432145, 432149, 432150, C03B 2504

Patent

active

039973174

ABSTRACT:
This disclosure relates to glass annealing lehrs in which glass ware is supported on an endless conveyor to convey it through a closed tunnel consisting of separately controllable temperature zones which expose the ware to a glass annealing temperature gradient produced and maintained by gaseous fuel burners and electrical heaters employed separately or jointly, depending upon the availability of the fuel or electrical energy. In accordance with the invention, circulating fans are positioned at both sides of each lehr section, and air inlet ducts are provided for admitting controlled amounts of ambient air to the inlet of each fan.

REFERENCES:
patent: 2544947 (1951-03-01), Baker
patent: 2637754 (1953-05-01), Shaw et al.
patent: 3261596 (1966-07-01), Bowman
Letter of Apr. 21, 1975 to Mr. Jaspert from Mr. Jeffery, Letter of Sept. 4, 1975 of Mr. Jeffery to "Office of the Solicitor".

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