Patents Assigned to Francis Shaw & Co. (Manchester) Ltd.
  • Apparatus for and method of treating a viscous material
    Patent number: 4793957
    Abstract: Material to be colored is fed from an extruder to a positive displacement means such as a gear pump. The output from which is split into at least two streams one of which is fed to a mixer which is preferably a cavity transfer mixer. Colorant is injected into one of the streams either before or at the mixer and the two streams are recombined downstream of the mixer preferably in a diehead. The arrangement provides for reliable coloration whilst premitting flexibility in production.
    Type: Grant
    Filed: February 25, 1987
    Date of Patent: December 27, 1988
    Assignee: Francis Shaw & Co. (Manchester) Ltd.
    Inventor: John G. A. Lovegrove