NEWSPRINT

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through these narrow slits by the jogging motion of the outer half-cylindrical
container, which is flexibly coupled to the main framework of the strainer by
rubber jointing each end. Material, such as coarse shives and slivers, which
is rejected by the screens, will accumulate in the outer jogging container. It
may be removed by bleeding continually a small quantity of stock from the
bottom of the container and passing it to an auxiliary flat screen, such as that

[Walmsleys (Bury), Ltd.
[.Y FOR A LARGE

On the left, the flexibly mounted container of one of the four inward-flow cylindrical screens can be seen

FIG. 115.—A TYPICAL STRAINER, BREAST Box AND PROJECTION SLICE ASSEMBLY FOR A LARGE

NEWSPRINT MACHINE

illustrated in Fig. 50, where accepted stock is returned to the wire pit, and
rejected material is sent to the main drain.
A large machine producing 150 tons of newsprint a day will require four
strainer units mounted parallel to each other and parallel to the direction of
the machine. The screened stock is discharged from the strainers into the
flow box which leads it over various baffles and weks to the slice (see Fig. 115).
In the single case of the world's largest paper machine, making 200 tons or
more of paper per 24 hours, there are six strainers all arranged at right angles
to the direction of flow, in two lines of three, on either side of a central collecting
trough.
The art in designing efficient flow (or breast) boxes consists firstly in aiming