| 摘要 |
PCT No. PCT/GB86/00015 Sec. 371 Date Nov. 7, 1986 Sec. 102(e) Date Nov. 7, 1986 PCT Filed Jan. 9, 1986 PCT Pub. No. WO86/03993 PCT Pub. Date Jul. 17, 1986.A method of and apparatus for the electrostatic application of a coating material on a product of either electrically conducting or non-conducting material. The product is caused to descend from a hopper (10) in free fall in the form of spaced curtains (28, 30) across two streams (40, 42) of electrostatically charged coating material directed laterally of the curtains from opposite sides thereof. The rate of flow and spacing of the curtains (28, 30) is adjustable (32, 14, 16, 18, 20, 22, 26) as required depending upon the nature of the product and the properties of the coating material. Charges of opposite polarity are applied respectively to the two streams with the result that an electrostatic charge opposite to that of a stream is imparted to that side of each of the two curtains towards which the stream is directed causing attraction between the coating material and the product. The uniformity of the applied coating is much improved as compared with conventional techniques. |
