Gema Ag Apparatebau

Prazisions-werkzeuge Ag

Gema Ag

Peter Ribnitz

Karl Buschor

Hans Giesinger

A method and apparatus for measuring a quantity of particles deposited on a metal body to be coated with powder or the quantity of powder deposited per unit of time, especially on a moving body. The body is located in a space subjected to an electrostatic field and a quantity of powder deposited, possibly per unit of time, is measured by measuring a charge or current in a circuit connecting the field electrodes. An actual value deposited, indicated by a measurement, is used as a control parameter in a control circuit for adjusting an actual amount deposited to a set deposition amount which is adjustable.

Method and apparatus for measuring a quantity of particles deposited on

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.

Spray method and spray device, particularly for the spray-coating of

An apparatus for the electrostatic application of a coating material in the form of a liquid to articles or the like comprising a nozzle at the region of which there are provided at least two electrodes at which there is applied high-voltage of the same polarity but of different magnitude. The electrical field between the electrodes covers the nozzle opening in the form of a transverse field.

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St. Gallen, Switzerland

Peter Ribnitz