DANDY ROLLS

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ij inches apart. These are called the 'chain* wires. Letters and devices of
wire may be sewn or soldered on the surface of the roll.

Hollow Dandies.—Nowadays increasing use is being made of hollow-type
dandies having no spindles or journals (Fig. 94), These are very rigidly con-
structed and have many advantages over the old type. In the first place they run
on a rim supported by rollers on ball bearings, and have a very fine adjustment
(Fig. 95). The bracket which is illustrated also has a quick lift lever, enabling
the dandy to be lifted clear of the wire instantaneously. The fact that the dandy

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Re. 95.-0AHi>Y STAND, BEAHNGS AND ADJUSTED MBCHAHSU *ot Botiow DANWHS
is hollow enables stationary steam- and water-pipes to remain inside die dandy
and to be used crotmuously or intermittently for fining it from die inside.
The advantage of tbis will be obvious. It is also possible to fit a stationary
tray inside to catch water and pieces of stuf£ and run diem dear of the dandy.
The introduction of diese aoDow dandies las enabled much greater speeds
to be attained without deterioration i» tbc quality of the paper, and it is possible
to run these daadies for 6 to 8 weeks continuously without having to remove
them from the machine for cleaning.
The function of the dandy roll is primarily to assist in closing up the sheet
by pressure on the fibres while in a wet state* For this reason a roll as heavy