DISPENSING OF FLUIDS TO SMALL AREAS
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Abstract
In the manufacture of a number of small parts, selected areas of the surface of a sheet are inspected and defective areas are magnetically identified with a specially formulated, relatively high viscosity magnetic fluid. The sheet is then divided into a number of small parts and those parts formed from defective areas of the sheet are magnetically separated from the remaining parts. In this method, air pressure is applied to a free piston located within the barrel of a pen that forces the magnetic fluid through the capillary tip of the the pen onto the selected surface areas. Methods and apparatus are provided for controlling the size and shape of the magnetic mark.
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