Improvements in and relating to the Finishing and Surfacing of Paper.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to the Finishing and Surfacing
of Paper.
We, GEORGE JOHNSTON and JAMES BLAINE, Papermakers, and THOMAS MARSHALL,
Engineer, all of Carron-Grove Paper Works, Denny, Stirlingshire, do hereby
declare the nature of our invention to be as follows:-
This invention has reference to an improved method of applying a finish or
surface to paper at the calender rolls.
According to these improvements we fit a tube to be carried in housings pro-
jecting from the calender roll brackets. This tube is formed with holes or
perforations on one side, and side plates or wings project out from the sides of
tube and are formed with bent out flanges.
A sieve of wire cloth is fitted on these side plates, with flanged plate ends to
overlap the flanges on these side plates, and be removable for being periodically
cleaned, while the ends of the trough shaped vessel or space thus formed would
be made steam tight, and these ends would be fitted with a portable or moveable
plug piece, so as to act as a stopper and enable any width of paper to be treated.
A curved doctor or guard plate would be attached to perforated tube, and curve
under the wire screen or sieve and extend the whole length of calender rolls.
The end of the perforated tube is coupled to an injector which by a steam jet
and central and annular nozzles forces a steam spray of saponified water or liquid
to pass through the perforated tube and sieve in the form of a spray or vapour to
play on the paper immediately before passing through the calender rolls. This
method of spraying the paper can be applied at the various calender rolls to act
on both surfaces of the paper or only on one surface as desired.
The end of perforated tube opposite to that at which the fluid enters would be
fitted with an exhaust pipe so as to carry away any condensed steam that may
accumulate in tube, while the doctor or guard plate will prevent any drops of
condensed liquid that may accumulate on wire screen from coming in contact
with the paper.
The effect of this method is to give a very high and thoroughly even surface over
the sheet of paper without in any way lessening the bulk or sizing of paper.
Dated the 22nd day of February 1898
Improvements in and relating to the Finishing and Surfacing
of Paper.
We, GEORGE JOHNSTON and JAMES BLAINE, Papermakers, and THOMAS MARSHALL,
Engineer, all of Carron-Grove Paper Works, Denny, Stirlingshire, do hereby
Price 8d 1

page_text: declare the nature of our invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement, that is to say: -
This invention has reference to an improved method of applying a finish or
surface to paper at the calender rolls.
And in order that our said invention and the manner of carrying same into
practice may be properly understood we have hereunto appended a sheet of
explanatory drawings in which Figure 1 is an elevation and Figure 2 a transverse
section of apparatus illustrating our improvements while Figure 3 represents a
detached elevation and transverse section of a stopping up plug piece, and
Figure 4 is a diagram end view of the calender rolls.
Referring to these drawings:-
According to these improvements we fit a tube a to be carried in housings
projecting from the calender roll brackets. This tube is formed with holes or
perforations at a on one side and side plates or wings b project out from the sides
of tube a and are formed with bent out flanges A. sieve of wire cloth c is
fitted on these side plates, with flanged plate ends to overlap the flanges b¹ on
these side plates, and be removable for being periodically cleaned, while the ends
of the trough shaped vessel or space thus formed would be fitted with portable or
moveable plug pieces d so as to act as stoppers and enable any width of paper 1
to be treated. A curved doctor or guard plate e is attached to perforated tube a
and curves under or near the wire screen or sieve c and comes in contact with,
or is fitted to calender rolls A.
The one end of the perforated tube a is coupled to an ordinary injector f which
by a steam jet from a pipe f2 fitted with a regulating cock f3 through a central
nozzle f forces saponified liquid and air to pass from a vessely with a regulating
cock through à pipe g² and the annular space in the injector f and then
through the perforations a¹ in the tube and sieve c in the form of a spray or
vapour to play on the paper immediately on passing through the calender rolls A.
This method of spraying the paper can be applied at the various calender rolls A
to act on both surfaces of the paper or only on one surface as desired.
An exhaust pipe would be fitted at a near the end of perforated tube a opposite
to that at which the fluid enters so as to carry away any condensed steam that may
accumulate in tube, while the doctor or guard plate e will prevent any drops of
condensed liquid that may accumulate on wire screen from coming in contact with
the paper.
The effect of this method is to give a very high and thoroughly even surface on
both sides over the sheet of paper without in any way lessening the bulk or sizing
of paper.
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:-
The method of applying a finish or surface to paper by spraying a liquid or
vapour on to same on passing through the calender rolls, substantially as set
forth.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.