3i6

MODERN PAPER-MAKING

As the weight of the web increases, the paper is pressed harder to the cylinders
and wound tighter, which is the reverse of the friction type, where the pull
of the friction has less effect as the web increases in diameter. The weight of
the levers is so applied that the web can be partly supported to ensure regular
pressure from the start to the finish of the reel. In the drum winder all the
slit webs are wound on one spindle, strawboard centres of the requisite width

[Messrs. Masson, Scott and Co., Ltd.
fig. 134.—voith type high-speed slitting and rewinding machine
being put on the bar and kept tight and in position by an expanding device.
The paper is wound by the action of two cylinders travelling close together in
the same direction, the webs being in contact with both. The cylinders are
sometimes spiralled on the surface, outwards from the centres, to reduce the
chances of creasing. If only one cylinder is used, the web is pressed against
it by means of levers at the spindle ends, or else it runs directly on top of it.
When it is necessary to reel two webs of different yardage a four-drum winder
is used. By this means two webs of different lengths may be run off at the
same time from the same reel.