Abstract: The apparatus for forming and applying a substantially strip-shaped powder layer onto a weld seam of a can body, comprises a spray head including a spray chamber. A powder supply device supplies a powder composed of powder particles transported by a carrier gas and in the form of a substantially bundled powder jet into the spray chamber of the spray head. The spray chamber is provided with a spray opening which is open towards the weld seam and is located opposite the weld seam. Structure is provided for establishing a pressure in the spray chamber which is lower than the pressure of the surrounding stmosphere to ensure retention of the bundled powder jet entering the spray chamber and to prevent formation of a spray cloud of the powder particles of the bundled powder jet composed of the powder transported by the carrier gas.

Abstract: In order to apply a strip-shaped powder layer onto the inside of a can body to cover a welding seam of the can body in a controlled manner, the can body is moved in a predetermined direction over a spraying head transporting the powder, due to the kinetic energy imparted thereto by a moving air current, to an elongated opening of the spraying head. This elongated opening flow communicates with a spray chamber of the spraying head and is located opposite the welding seam of the can body. While the can body moves past the spraying head there is formed a strip-shaped powder layer at the welding seam without any cloud formation of the powder in the spray chamber.

Abstract: A strip-shaped powder layer is applied onto a weld seam of a container so that powder/gas mixture is supplied into a chamber having a lower pressure than in the surrounding atmosphere, is statically charged there, and partially applied onto the seam.