초록 ▼

A method and apparatus are disclosed for spray coating one or a series of objects with at least two powder coating materials in succession or alternately. When a change of the material being sprayed is to be effected, the flow of the first material is terminated, preferably by means of a squeeze val

A method and apparatus are disclosed for spray coating one or a series of objects with at least two powder coating materials in succession or alternately. When a change of the material being sprayed is to be effected, the flow of the first material is terminated, preferably by means of a squeeze valve, the flow path of the first material is flushed with a fluid, preferably air, and the second spray material is sprayed. The relative positions of the apparatus forming the respective flow paths of the two spray materials are not changed during this process. In one preferred embodiment, feed conduits corresponding to respective spray materials converge into a single delivery conduit. Each feed conduit includes means for closing and opening it. Means are provided for flushing at least part of a given feed conduit, or the delivery conduit, or both, with a fluid. The flushing can preferably be done pulsatingly.

대표청구항 ▼

A method for spray-coating objects with a powdered coating material selected from a plurality of powdered coating materials, comprising the steps of: transporting a first powdered coating material via a first feed conduit and a delivery conduit to a spray gun, for spraying an object therewith; termi

A method for spray-coating objects with a powdered coating material selected from a plurality of powdered coating materials, comprising the steps of: transporting a first powdered coating material via a first feed conduit and a delivery conduit to a spray gun, for spraying an object therewith; terminating the flow of the powdered coating material; transporting a second powdered coating material via a second feed conduit and the delivery conduit to the spray gun, for spraying the object therewith; these three steps being performed without changing the relative position of the conduits; and flushing with a fluid at least a portion of the respective path along which each powdered coating material is transported to the spray gun, the flushing step being performed at least during a time when no powdered coating material is being transported through the portion of the path that is flushed.