172

MODERN PAPER-MAKING

The remedy, of course, is to shift slightly the offending box or boxes, or
if this fails to overcome the trouble, then it may be necessary to remove the
suction boxes from the machine and face up the tops.

Machine wire manufacturers have their own methods of overcoming this
objectionable feature, but up to date it appears that whilst they have been
successful in 99 per cent of cases, there are still the odd few which give trouble,
and when they do it is trouble indeed unless immediate steps are taken to
counteract the fault.

The life of a wire is the length of time it runs or, more correctly, the weight
of paper made during that time. But it can readily be understood that no

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FIG. 59 FIG. 60
[The United Win Works Ltd.
FIGS. 59 AND <5o.—PHOTOGRAPHS OF THE UNDER SIDES OF HAND-$EWN SEAM AND Twnx WIRE, BOTH OF WHICH
HAVE BEEN ALLOWED TO GROOVE
definite time or weight can be calculated on, since a machine making thin
papers will wear out a wire with less output than one making heavier sub-
stances with the same width. The factors that influence the life of a wire are
of two kinds. First, the care taken of the wire by the machinemen and their
skill in its use, and accidental damage; secondly, those agencies which are con-
stant and unavoidable.
In the first may be placed the putting on of the wire when new. Without
going into all the details of putting a new wire on the machine, we will just
mention some of the items where damage may be done and how to avoid it.
The box containing the wire must be carefully opened. The screws which
fasten, die lid should be withdrawn entirely by the screw-driver and removed.