APPARATUS FOR EXTERNALLY COATING ENDLESS METAL TUBING

摘要

An apparatus for externally coating an elongated metal member, comprises: means forming a fluidized bed of a synthetic-resin powder; means forming a transport path through the bed for the elongated metal member; means upstream of the bed along the path for heating the member to a temperature sufficient to cause the powder to adhere to the surface of the member; means forming a coating head in the bed along the member, the coating means having an annular opening communicating with the bed; and means spaced from the opening for applying suction to the head to draw powder from the bed through the head and along the member, thereby coating the member with the powder. The resulting coatings are highly uniform and adhere very firmly to the surface of the elongated member.