Method and apparatus for extrusion coating of fluorescent...

B - Operations – Transporting – 29 – C

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B29C 41/08 (2006.01) B05C 3/10 (2006.01) B05D 1/26 (2006.01) B05D 3/06 (2006.01) B05D 5/00 (2006.01) C03C 17/00 (2006.01) C03C 17/32 (2006.01) H01J 9/46 (2006.01) H01J 61/35 (2006.01) H01J 61/50 (2006.01)

Patent

CA 2498398

A method and apparatus (40) for coating the glass envelope (13) and portions of the end caps (11) of fluorescent light tubes (15) in a continuous and sequential manner with a thermo~plastic material. The coating is applied by a cross head extruder (65) through which the light tubes (15) are sequentially fed. A vacuum applied during the coating process promotes direct and intimate contact between the coating and the light tubes (15). The end caps (11) may be heated prior to coating to ensure adherence of the coating to the end caps (11) and not to the glass envelope (13). Post-coating processes include cooling the coating, severing individual light tubes (15) from the chain of sequentially coated light tubes (15), and readying the coated light tubes (15) for packaging. The method is automatic, with the apparatus (40) being automatically controlled by a control unit (100).

La présente invention concerne un procédé et un dispositif (40) pour revêtir l'enveloppe de verre (13) et des parties des embouts (11) de tubes fluorescents (15) d'une manière continue et séquentielle avec une matière thermoplastique. Le revêtement est appliqué par une extrudeuse cruciforme (65) par laquelle on fait passer les tubes fluorescents (15) de façon séquentielle. Un vide appliqué au cours du processus de revêtement favorise le contact direct et intime entre le revêtement et les tubes fluorescents (15). Les embouts (11) peuvent être chauffés avant d'être revêtus pour garantir l'adhérence du revêtement aux embouts (11) et non à l'enveloppe de verre (13). Des procédés de post-revêtement comprennent le refroidissement du revêtement, la séparation des tubes fluorescents individuels (15) de la chaîne de tubes fluorescents (15) revêtus de façon séquentielle, et la préparation des tubes fluorescents (15) revêtus à l'emballage. Le procédé est automatique, le dispositif (40) faisant l'objet d'une commande automatique de la part d'une unité de commande (100).

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