Abstract: An industrial dryer particularly suited for small parts has a tub to contain the parts and a helical ramp along the interior tub wall. Vibratory motion makes the small parts move along the ramp. The tub has a double wall, the inside space between the walls defining an air plenum. The interior wall of the tub is formed with exit spaces through which the hot air emerges and blows over the parts as they move along the ramp. The plenum is continuously supplied with hot air to replace the losses. A unique method of forming the ramp from stair-step segments and partitions forms special conduits which focus hot air streams upon the parts as they move along the ramp in staircase fashion.

Abstract: A system and apparatus for treating articles of variable size and shape is disclosed in the illustrative embodiment utilizing vibrating feeder bowls into which fluids are introduced for treating the articles simultaneously with their automatic advancement. The system is further adapted for various spacial dispositions in accordance with the area available. A particular system is disclosed for treating aluminum nails by continuous advancement through a succession of feeder bowls at which the nails are subject to cleaning, washing, coating and rinsing.