Meter for measuring brightness of bleached fibers and controlling the bleaching process

Abstract

Abstract Apparatus for continuously controlling the bleaching of fibers and for continuously measuring and recording the brightness of light reflected from the bleached fibers comprising a bleaching tank, pipe lines for feeding fibers to and from the tank, drums for forming the fibers leaving and entering the tank into mats on the drums, and a first and a second photoelectric measuring apparatus supported by rollers on the fiber mats on the first and second drums, respectively, for producing first and second control signals representative of the separate brightnesses of the fiber mats. Motor controlled valves responsive to the first control signal regulate the flow of bleaching agent into the tank as well as the temperature of the fibers entering the tank. A computerized controller compares the value of the second control signal, representative of the brightness of fibers leaving the tank, with a predetermined standard value and modifies the response of the motor controlled valves to the first control signal in accordance with changes in the comparative value. Two reflectance standardization plates are mounted in at least one of the photoelectric measuring devices for calibrating the device over the range of brightness values which it must measure.

Inventors

• 👤 J Chappelle

Bibliographic Details