Apparatus for applying a strip-shaped powder layer onto a weld seam of containers

摘要

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. There is also provided structure for diverting at least part of the powder particles of the bundles powder jet from the spray chamber in the direction of the weld seam and for depositing such diverted powder particles onto the weld seam in the form of a substantially strip-shaped powder layer.