Improvements in Apparatus for Damping Paper.
Year: 1886

page_text: Improvements in Apparatus for Damping Paper.
I, ALEXANDER ANNANDALE, of Beltonford Paper Works, Dunbar, in the County
of. Haddington, 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, that is to say :-
•
My said Invention has for its object to improve the construction and action of
apparatus for damping paper by means of spray according to the method described
in the Specification of Patent N° 2104 of 1879, granted to me; and my improved
apparatus is shown upon an accompanying sheet of explanatory drawings.
In carrying out my Invention the spray is produced by a number of jets of nig
issuing from improved nozzles fixed horizontally in a horizontal pipe supplied with
compressed air by means of a Root's Blower or other suitable apparatus. These air,
jets issue directly across improved nozzles at the upper ends of vertical tubes which.
dip down into water contained in a trough, and by a well known action causes the
water to ascend in the vertical tubes and to issue from the nozzles; the air throwing
the water into spray and causing it to be distributed over the web of paper which.
is made to move from one guide roller to another in a suitable position for
receiving the spray.
Figure 1, of the drawings is a horizontal section of one of the air-jet nozzles and
also comprises a plan or end view of one of the water nozzles. Figure 2, is a
vertical section of the water trough, of the air supply pipe, and of the nozzle and
other details. Figures 3, and 4, are an end view and longitudinal section of a
stopper cap for closing any of the air-jet nozzles when required. Figures 5, and 6,
are an end view.and longitudinal section of another form of stopper cap. Figures 7,
and 8, are front and side elevations of an improved bracket for holding the water
tubes; and figures 9, and 10, are a plan and side elevation of an improved holder
to be adjustably fixed in the bracket and to have the vertical water tube adjustably
fixed in it. In these drawings the same reference numerals are used to mark the
same or like parts wherever they are repeated.
According to my present Invention the orifices of the air-jet nozzles, 11, and
water nozzles, 12, instead of being round as heretofore, are in the form of slits as
shown, the slits of the air-jet nozzles being horizontal and those of the water
nozzles at right angles to the centre lines of the air-jet nozzles. With this
improved construction of the nozzles the spray producing action is much increased

page_text: and improved, the volume of spray being augmented. I prefer to make the nozzle
orifices in the form of simple straight slits, but the slits may be curved or oval, any
deviation from the circular, or equi-sided shape being of advantage.
Stopper caps, 13, such as are shown in figures 3, to 6, are provided for closing
any of the air-jet nozzles, 11, when required. When the paper to be damped is of
less width than the maximum for which the air supply pipe, 14, and air-jet
nozzles, 11, are provided it is necessary to close those at the ends beyond the width
of the paper and for this purpose a number of stopper caps, 13, are provided these
caps being strung on or attached to cords or small chains by means of eyes, 15,
formed at their outer ends for the purpose. In the inner end of each stopper cap
there is placed a sinall piece of rubber or other suitable compressible material to
close the orifice of the nozzle without injuring it. Each cap is held on the nozzle
by its wider end which is made to fit tightly on a parallel part, 16, of the nozzle.
The necessary tightness may be secured by having the cap slit at one side as shown
in figures 3, and 4, with lugs, 17, formed at the sides of the slit to be drawn
together by a screw; or the cap may be slit at two or more sides as shown in
figures 5, and 6, the larger end being in this case made slightly smaller than the
part, 16, of the nozzle on which it has to fit so as to be sprung a little when
put on.
The vertical water tube; 18, having the nozzle, 12, at its upper end is held in a
split bearing or socket, 19, formed on the outer end of the holder spindle, 20, this
bearing being made with lugs, 21, at the sides of the slit, to be drawn together by
a screw. In a similar way the holder spindle, 20, is held in a split bearing or
socket, 22, formed on the bracket, 23, and made with lugs, 24, at the sides of the
slit to be drawn together by a screw. With these arrangements the water tubes, 18,
with their nozzles, 12, can each be adjusted horizontally and vertically, so that the
best positions for effective action may be easily ascertained by trial and then
secured by tightening the screws by which the bearings, 19, and 22, are made to
grip the vertical tube, 18, and holder spindle, 20.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is:-
1. Making the orifices of the air-jet and water nozzles of apparatus for
producing spray for damping paper, of a slit-like or other elongated form sub-
stantially as herein before déscribed.
2. The improved stopper caps herein before described with reference to figures 3
to 6 of the accompanying drawings combined with the adaptation of the air-jet
nozzles to receive them, substantially as hereinbefore described.
3. The improved construction of parts for adjusting and bolding the water
tubes with their nozzles substantially as herein before described with reference to
figures 7 to 10 of the accompanying drawings.
Dated this twenty first dow of April 1986