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Screening-apparatus-for-a-papermaking-machine

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Screening apparatus for a papermaking machine

Details

Inventors: Justus, Edgar J.;
Assignee: Beloit Corporation (Beloit, WI)
Primary Examiner: Prunner; Kathleen J.
Assistant Examiner:
Attorney, Agent or Firm: Hill, Van Santen, Steadman, Chiara & Simpson

A screen apparatus for processing stock flowing into a papermaking headbox which includes a cylindrical housing, a tubular screen mounted longitudinally within the housing, and inlet means for introducing a stock suspension into the housing for flow through the screen. Outlet means are provided for receiving the suspension passing through the tubular screen for delivery to the headbox. The improvement of the present invention provides a helical slot in the housing which discharges stock passing through the screen into the outlet means. Foil means mounted for rotation coaxially with the cylinder are provided which create a pressure pulsation to cause a dispersal of the fibers and aid in the screening operation.

DETAILED DESCRIPTION The present invention provides a screen apparatus for processing stock flowing to a papermaking headbox.
In general, it includes a cylindrical housing, and a tubular screen mounted longitudinally within the housing.
An inlet means is provided for introducing a stock suspension into the housing for flow through the screen.
An outlet means receives the suspension passing through the tubular screen for delivery to the headbox.
One of the features of the invention is the provision of a helical slot formed in the housing which discharges stock passing through the screen into the outlet.
The screen apparatus is also provided with foil means mounted for rotation coaxially with the axis of the cylinder.
In the preferred form of the invention, the helical slot extends for more than 75% of the length of the foils.

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