Coating processes – Electrical product produced – Fluorescent or phosphorescent base coating
Patent
1983-07-25
1985-03-26
Smith, John D.
Coating processes
Electrical product produced
Fluorescent or phosphorescent base coating
427106, 427185, 427282, 427287, H01J 6135
Patent
active
045073325
ABSTRACT:
Methods of and apparatus for coating the glass envelope and predetermined portions of the end caps of a fluorescent lamp with a coating of polymeric material including securing the end caps against displacement, subsequently, preheating the glass envelope and the predetermined portion of the end caps to a first predetermined temperature above the melting point of the polymeric material for a predetermined amount of time; subsequently, masking the electrical connecting pins and all of the end caps except the predetermined portion thereof; subsequently, exposing the glass envelope and the predetermined portion of the end caps to a fluidized bed of powder of the polymeric material for a predetermined amount of time to apply a coating of the powder to the glass envelope and to the predetermined portion of the end caps; subsequently, reheating the glass envelope and the predetermined portion of the end caps to a predetermined temperature above the melting point of the polymeric material and for a predetermined amount of time to melt and fuse the powder on the glass envelope and the predetermined portion of the end caps to form the applied powder into a substantially uniform thick coating of polymeric material and; subsequently, unmasking the pins and the end caps and unsecuring the end caps. Additionally, the glass envelope and the predetermined portion of the end caps may be cooled after reheating to a predetermined temperature and for a predetermined amount of time to quench and clarify the coating of polymeric material. Additionally, the temperature of the fluidized bed may be controlled to provide more uniform coating and pressurized air may be supplied to surround the connecting pins during coating to further prevent coating of the pins.
REFERENCES:
patent: 2868670 (1959-01-01), Van Laar
patent: 3018187 (1962-01-01), Boyce
patent: 3440078 (1969-04-01), Sharetts
patent: 3856498 (1974-12-01), Campagna
patent: 3902946 (1975-09-01), Anderre
patent: 3937853 (1976-02-01), Shank
patent: 3937854 (1976-02-01), Shank
patent: 3959525 (1976-05-01), Sentementor
patent: 3989859 (1976-02-01), Koerpir
Karlsson Axel T.
Nolan James D.
Rhodes, Jr. R. Gale
Smith John D.
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