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

B - Operations, Transporting

05

D

204/91.33

B05D 3/06 (2006.01) C03C 17/28 (2006.01) F21K 5/08 (2006.01) H01K 3/00 (2006.01)

Patent

CA 1139711

D-22,121 METHOD OF APPLYING PROTECTIVE COATING ON LAMP ENVELOPE ABSTRACT OF THE DISCLOSURE 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.

348760

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