Apparatus for coating interior surfaces of objects with abrasive materials.

摘要

Apparatus for coating interior surfaces of objects employs an electrostatic fluidized bed unit (10) in which the fluidization chamber (64, 66, 68) is relatively shallow, and is circumscribed by a marginal portion (30) that conforms closely to the dimensions and configuration of the cavity of the object. The apparatus employs, as a feature of its recovery and recirculation system, a fluidized bed for agitating and facilitating feeding of the particulate material, thus making the system especially well suited for depositing coatings of abrasive materials, such as vitreous frit.