An Improvement in Dandy Rolls for Papermaking.
Year: 1895

page_text: Date of Application, 12th Jan., 1895
Complete Specification Left, 24th May, 1895-Accepted, 11th Jan., 1896
An Improvement in Dandy Rolls for Papermaking.
I, JOHN LISTER, of Strathendry Paper Mills, Leslie, in the County of Fife,
North Britain, Paper Maker, do hereby declare the nature of this invention to be
as follows:-
This invention relates to an arrangement whereby a small supply of steam is led
into and through the hollow spindle of the dandy roll, the spindle being perforated
on its periphery, a fine spray of steam is thrown on the inner surface of the dandy
cover, and prevents the accumulation of froth, which, in the case of small wove
dandy rolls especially, is the source of so much loss and annoyance.
Dated this 11th day of January 1805
JOHNSONS,
115 St. Vincent Street, Glasgow, Applicant's Agents.
An Improvement in Dandy Rolls for Papermaking.
I, JOHN LISTER, of Strathendry Paper Mills, Leslie, in the County of Fife,
North Britain, Paper Maker, do hereby declare the nature of this invention, and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
This invention relates to an arrangement whereby a small supply of steam is led
into and through the hollow spindle of the dandy roll, the spindle being perforated
in its periphery so that a fine spray of steam is thrown upon the inner surface of
the dandy cover, preventing the accumulation of froth, which, in the case of small
wore dandy rolls especially, is the source of much loss and aunoyance.
The accompanying drawing is a vertical section through a portion of a dandy
roll showing the application of this invention.
A represents the dandy roll and B the hollow spindle shown perforated at C
and preferably having tubular extensions C¹ projecting inwardly to prevent the
escape through the holes C of the condensation which will be formed in the tube B.
The water can escape from the tube B through the openings D at the end or may
be drawn off in any other convenient manner. E are any convenient supporting
arms, perforated or other discs or the like, which carry the dandy cover A and
F are the ends of the roll closing in the space between the cover A and the hollow
spindle B, this space being filled with the steam supply through the spindle B and
holes C.
G is any convenient steam nozzle or source of steam supply adapted to inject
the steam into the hollow spindle B; in the drawing the end of B is shown reduced
at B', and countersunk at B 2 so as to facilitate the entry of the steam. With this
arrangement air as well as steam can be driven into the spindle B but this is not
material so long as the required result is obtained. It will be understood that the
steam may be introduced into the roller in any other convenient manner and that
an air or steam tight joint between the nozzle and the spindle may be made by

page_text: means of a stuffing-box or other device if desired; the device shown however is
cheap and simple and as I find it gives satisfactory results in practice I have
described it. The nozzle G is shown carried in any convenient frame or standard H
and by the screwed rod I and nut or hand-wheel J is adapted to be raised or
lowered in accordance with the position of the dandy roll.
It is also capable of lateral adjustment.
Steam may be supplied at one or both ends of the spindle; in the drawing only
one nozzle G is shown but the other end of the spindle is adapted to accommodate
a second nozzle or it may be closed.
By the heating of the roll I find that the accumulation of froth or bubbles upon
the dandy roll is prevented and I have described the employment of steam for this
purpose as being suitable and efficient. I wish it to be understood however that
other means of heating the roll may be employed for example the introduction of
heated air.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is ;-
1. The employment of heat in a dandy roll for the purpose of preventing the
accumulation of froth bubbles and the like.
2. The application of steam to a dandy roll for the purpose of preventing the
accumulation of froth bubbles and the like.
3. The application of steam, hot air or its equivalent to the inner surface of a
dandy roll by means of a hollow perforated spindle such as B C with or without
internal tubes such as C₁ for the purpose of preventing the accumulation of froth
bubbles and the like.
4. The combination and arrangement of parts constituting the dandy roll and
steam supply substantially as described and illustrated in the accompanying
drawings.
Dated this 22nd day of May 1895
BOULT & WADE,
Agents for the Applicant.