FLOW SPLITTING DEVICE FOR WEB PROFILE CONTROL STOCK DILUTION SYSTEM

摘要

PURPOSE: A devices and a headbox is provided which controls the flow of stock to a headbox in general and in particular employs stock dilution for controlling web base weight profile. CONSTITUTION: A Y-shaped flow splitter(36) passes papermaking fluid with some fibers with reduced clogging and has a flat surface(68) opposite the leg(44) of the Y where the flow divides into the two arms(46) of the Y. A generally flat rectangular surface is positioned opposite the leg of the Y of the flow splitter which divides the flow evenly without providing a place for fibers to collect and thus clog the flow through the splitter. The splitter allows the flow to a pair of dilution tubes to be controlled by a single valve with a single flow passage reducing clogging and valve cost. The flow splitter is constructed of stainless steel by a by casting process. A process known commercially as the Extrude hone process is used to produce smooth flow passages.