Method of applying protective coating on lamp envelope

Details Method of applying protective coating on lamp envelope Method of applying protective coating on lamp envelope

1979-04-20

1980-04-08

Newsome, John H.

Coating processes

Electrical product produced

Welding electrode

427 44, 427 55, 427106, 427425, B05D 306

Patent

active

041973330

ABSTRACT:
A method of applying a protective light-transmitting coating on the exterior surface of the glass envelope of a lamp, the method comprising: holding the lamp with its longitudinal axis disposed horizontally and rotating the lamp about its longitudinal axis; flow-dispensing a liquid coating material of a predetermined viscosity onto the rotating lamp envelope from a dispensing means including a profiled row of needles located above the lamp; and allowing the envelope coating to be cure-hardened, such as by irradiation. The method is particularly useful for applying an optically clear photopolymer coating on the glass envelope of a photoflash lamp in less than one second and then curing the coating by irradiation with a source of ultraviolet light.

REFERENCES:
patent: 2572515 (1951-10-01), Poole et al.
patent: 2574686 (1951-11-01), Brown
patent: 3009209 (1961-11-01), Weinbrenner et al.
patent: 3258521 (1966-06-01), Francel
patent: 3953626 (1976-04-01), Suzuki et al.
patent: 4076489 (1978-02-01), Schroeter et al.
patent: 4082870 (1978-04-01), Yenni

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