Extrusion coating of magnetic recording layers onto strip for manufacture of a data storage medium involves measurement of height deviation across the edges of the coating head blocks

摘要

A continuously moving strip moves over the outer edges(34A,36A) of a coating head(14). The head comprises two or more blocks(34,36) whose edges can be adjusted relative to each other. Blocks are supported on a base(41) forming a reference plane and allowing a specific edge height difference to be set. Deviation of height difference is then measured in the strip breadth direction and adjusted before fluid is applied to the strip via an outlet(30A) between the block edges. An Independent claim is made for the coating equipment which has a measuring arrangement(20) for detemination of height difference deviation in the direction of the strip breadth and a mechanism(62) for correcting any deviation. Preferred Features: Measuring equipment(20) for determining height difference deviation can be either a microscope, a contact type detector with a dial gauge and lever or a laser displacement detector. Height difference is measured along a tangent to the outer edges(34A,36A).