Method for producing an apertured work piece

Details Method for producing an apertured work piece Method for producing an apertured work piece

B - Operations, Transporting

08

B

149/10

B08B 3/08 (2006.01) B08B 3/10 (2006.01) H01J 9/14 (2006.01)

Patent

CA 1052673

METHOD FOR PRODUCING AN APERTURED WORK PIECE ABSTRACT OF THE DISCLOSURE An apertured work piece, such as a shadow mask for a color television picture tube, is produced by coating opposite major surfaces of a thin metal sheet with etch- resistant patterns. One pattern comprises an array of larger open areas surrounded by etch-resistant material, and the other pattern comprises smaller open areas of similar shape and registered with the larger open areas. Each of the smaller open areas has therewithin a still- smaller solid area of etch-resistant material. The coated sheet is etched from both sides to produce the desired apertures, and then the coatings are removed from the sheet. -1-

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