Apparatus for powder coating sucker rod

Coating apparatus – Projection or spray type – Applying solid particulate material

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Details

118308, 118312, 118320, 118DIG4, 118DIG5, 427195, B05C 500

Patent

active

042638712

ABSTRACT:
Elongated members to be plastic coated are cleaned, preheated to a temperature above the melting point of powdered plastic, and axially rotated while moved through a special coating chamber. Air locks located on opposed walls of the chamber freely receive the heated rotating member therethrough. An isolated, dry fluidized bed of plastic particles is formed below the airlocks and in underlying relationship to the moving member. A conduit has an inlet thereof located within the bed and an outlet thereof is directed downwardly towards the rotating member. An air lift moves the fluidized plastic from the bed, through the conduit, and into contact with the outer surface of the heated, rotating member, whereupon some of the powdered plastic fuses into a uniform coating which adheres to the outer surface of the member. A wet quench chamber is located immediately adjacent to the dry coating chamber. Liquid coolant flows about the hot plastic coated member and reduces the temperature thereof to a value which enables the coating to become sufficiently hard for handling.

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