Abstract: A coating apparatus with a spray head is provided for coating can bodies internally. The spray head is supplied with coating material through a feed line which passes through the seam welding machine for the container bodies. The combined spray and extraction head is also connected to a suction line which extracts excess coating material which has not been deposited on the internal walls of the container bodies, and returns it through the welding machine. In this way, the escape of coating material between the individual can bodies can largely be avoided, thus reducing contamination of equipment.

Abstract: A coating apparatus with a spray head is provided for coating can bodies internally. The spray head is supplied with coating material through a feed line which passes through the seam welding machine for the container bodies. The combined spray and extraction head is also connected to a suction line which extracts excess coating material which has not been deposited on the internal walls of the container bodies, and returns it through the welding machine. In this way, the escape of coating material between the individual can bodies can largely be avoided, thus reducing contamination of equipment.

Abstract: A method is provided for use with an injector arrangement where particulates are to be entrained in a gas transport medium. The apparatus has a nozzle discharging conveying gas and a secondary, dosing gas flow provided from an annular passage. This secondary flow envelopes the conveying gas. Particulates are drawn into the combined gas streams by a venturi effect.

Abstract: An injector for conveying a pulverulent material is supplied with entraining air via a line and with dosing air via another line. Dosing air and entraining air are kept constant in their total rate of flow by a flow controller. This yields a particularly homogeneous powder/air mixture, which is particularly advantageous in the conveying of coating powder for coating welded seams on can bodies.

Abstract: An injector arrangement for use where particulates are to be entrained in a gas transport medium. The apparatus has a nozzle discharging conveying gas and a secondary, dosing, gas flow provided from an annular passage. This secondary flow envelopes the conveying gas. Particulates are drawn into the combined gas streams by a venturi effect.