Improvements in and relating to Paper Calendering Machines.
Year: 1893

page_text: Date of Application, 31st Oct., 1893
Complete Specification Left, 18th July, 1894-Accepted, 18th Aug., 1894
PROVISIONAL SPECIFICATION.
Improvements in and relating to Paper Calendering Machines.
We, CHARLES CHALMERS of Lochmill, in the Town and County of Linlithgow,
Paper Manufacturer, and JAMES THOMSON of same address, Foreman, do hereby
declare the nature of our invention to be as follows:-
This invention has reference to and comprises a new or improved mode and
means of damping paper before or while passing through the usual paper calender
machines, and whereby a machine surfaced paper of great smoothness will be
obtained.
The improvements consist in mounting a longitudinal tube or box over and in
front of the calender roll over which the paper is fed to be damped, and in forming
the lower surface of this tube with a series of perforated openings or alternatively
a longitudinal slit may be formed in the tube, and strengthened by stays at
intermediate parts. Water under gravitation, steam, or other pressure, and
preferably of a lukewarm temperature, is admitted through a regulating valve to
this tube, and is sprayed in jets through the perforations or slit and projected on to
the surface of the calender roll. A guard board or "doctor" is mounted on a
bracket or other support parallel to and in front of the calender roll with its inner
end close up to the roll and a sheet or layer of felt, or a compact series of yarn
threads, or other fibrous or soft material is placed over the "doctor" and interposed
to cover up the junction space between it and the roll and bear over the surface of
latter close up to or under the perforated tube, so that as the water is sprayed on
to the surface of roll this felt or fabric material will distribute and spread it
uniformly.
Dated the 30th October 1893.
W. R. M. THOMSON & CO.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to Paper Calendering Machines.
'We, CHARLES CHALMERS, of Lochmill in the Town and County of Linlithgow,
Paper Manufacturer, and JAMES THOMSON of same address, Foreman, do
hereby declare the nature of our invention, and in what manner the same is
to be performed to be particularly described and ascertained in and by the
following statement in writing, that is to say :-
This invention has reference to and comprises a new or improved mode and
means of damping paper before or while passing through the usual paper calender
machines, and whereby a machine surface paper of great smoothness will be
obtained.
And in order that our said invention and the manner of performing or carrying
the same into effect or practice may be properly understood, we have hereunto
appended an explanatory sheet of drawings in which Figure 1 represents an
elevation and Figure 2 a plan view of the rolls of a paper calender machine as fitted
with our improvements. While Figure 3 represents an end sectional elevation at
right angles to and corresponding to Figure 1.

page_text: Referring to these drawings
The improvements consist in mounting a longitudinal tube or box a over and in
front of the calender roll A round which the paper is fed to be damped, and in
forming the lower surface of this tube with a series of perforated openings at a¹, or
alternatively a longitudinal slit may be formed in the tube a and strengthened by
stays at intermediate parts. Water under gravitation, steam, or other pressure and
preferably of a lukewarm temperature, is admitted through a regulating valve a² to
this tube a, and is sprayed in jets through the perforations a¹, or slit, and projected
on to the surface of the calender roll A, as shown in Figures 1 and 3. A guard
board or "doctor" B, is mounted on a bracket or other support parallel to and in
front of the calender roll A with its inner end close up to the roll A. and a sheet or
layer of felt B', or a compact series of yarn threads, or other fibrous or soft
material is placed over the "doctor" B and interposed to cover up the junction
space between it and the roll A, and bear over the surface of latter close up to or
under the perforated tube a so that as the water is sprayed on to the surface of roll A
this felt or fabric material B' will keep it from running down the surface of the
roll and cause it to spread uniformly.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
First. In paper calender machines, the fitting of a perforated or slitted tube
through which water or liquid under pressure is spread on to the calender roll,
substantially as herein described in reference to and shown in the accompanying
drawings.
66
Second. In paper calender machines, the combination of a perforated or slitted
tube, through which water or liquid under pressure is sprayed, a guard board or
doctor," and a sheet or layer of fibrous or soft material for spreading the sprayed
liquid on the calender roll, substantially as herein described in reference to and
shown in the accompanying drawings.
Dated the 17th July 1894.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.