POWUER COATING APPARATUS U.S. Patent 6,068,702. May 30, 2000 C. Bertellotti et al., assignors to Nordson Corp., Westlake, Ohio

A powder coating apparatus capa- ble of converting between at least two different powder coating sys- tems, the apparatus comprising an operating hood having sides generally surrounding a powder coating area, with at least one side having an opening to allow the introduction of a part to be coated within the powder coating area; an air circulation system connected to the operating hood for drawing air from the powder coating area as the part is coated with powder; and an adjustable air flow regulator operatively con- nected with the air circulation system for controlling the draw of

air and powder out of the powder coating area between a first draw amount and a second, higher draw amount, wherein the first draw amount allows use of the hood as one powder coating sys- tems and the second, higher draw amount allows use of the hood as another powder coating system.

ELECTROSTATIC COATING SYSTEM U.S. Patent 6,068,877. May 30, 2000 K. Seitz et al., assignors to Wagner International AG, Alstatten, Switzerland

A method of detecting and coating workpieces in an electrostatic coating system comprising apply- ing a high voltage to an electrode of at least one electrostatic coat- ing device, in which a spray cur- rent containing electrical charges

for charging particles of a coating material to be sprayed is gener- ated by the electrode; passing an electrically conductive workpiece to be coated by the at least one coating device; determining the spray current of the high voltage electrode; detecting whether the workpiece is in front of the at least one coating device depend- ing on the magnitude of the deter- mined spray current; starting a discharge of the coating material by the at least one coating device when the spray current exceeds a first threshold value of spray cur- rent; and stopping the discharge of coating material by the at least one coating device when the spray current falls below a second threshold value of spray current.

Coating and Surface Treatment Systems for Metals by/. Edwards 470 pages $135.00

Selection of the most appropriate coating or other surface treatment is addressed in this comprehensive guide. Part I covers 76 industrially important coating types from acrylic polymers through zinc alloys. Part II provides an overview of the 19 most important coating and treatment methods with emphasis on the implications for a particular product in terms of its substrate or shape. Part Ill offers a guide to coating characteristics.

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Zinc Plating by H. Geduld 360 pages $125.00

This book contains 15 chapters includ-

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128 Metal Finishing