Importance

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Abstract

The invention provides a powder coating apparatus, comprising a fresh powder container for receiving fresh powder, a recovery container for receiving powder recovered from the coating process, and a mixing container, which is connected to the fresh powder container and the recovery container via a first powder line and a second powder line, and comprising a control means for adjusting the mass flow rates of powder flowing in the first and the second powder line at a predetermined ratio of fresh powder and recovered powder. A first powder mass sensor is provided in or at the first powder line, and a second powder mass sensor is provided in or at the second powder line, wherein the control means is coupled with the first and the second powder mass sensor to adjust the ratio of the mass flow rates of powder flowing in the first and the second powder line. First of all fresh powder is supplied into the mixing container via the first powder line until a predetermined filling level is reached; the fresh powder is then substantially completely supplied to the coating device and is sprayed there; excess powder is collected and supplied to the recovery container; when a predetermined filling level is reached in the recovery container, the recovered powder and the fresh powder are substantially simultaneously supplied into the mixing container.

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First Claim