IMPROVEMENTS IN THE MANUFACTURE OF PAPER AND APPARATUS THEREFOR
Year: 1877

page_text: LETTERS PATENT to George Tidcombe, junior, of the Firm of G. Tidcombe &
Son, Paper Makers' Engineers, of Watford, in the County of Herts, and Arthur
Milbourn, of No. 11, Victory Place, New Kent Road, in the County of Surrey,
for the Invention of "IMPROVEMENTS IN THE MANUFACTURE OF PAPER AND
APPARATUS THEREFOR."
Sealed the 8th March 1878, and dated the 24th September 1877.
PROVISIONAL SPECIFICATION left by the said George Tidcombe and
Arthur Millbourn at the Office of the Commissioners of Patents on the 24th
September 1877.
GEORGE TIDCOMBE, junior, of the Firm of G. Tidcombe & Son, Paper Makers'
Engineers, of Watford, in the County of Herts, and ARTHUR MILLBOURN, of No. 11,
Victory Place, New Kent Road, in the County of Surrey. "IMPROVEMENTS IN
THE MANUFACTURE OF PAPER AND APPARATUS THEREFOR.”
"
Our Invention relates to improvements in the process and apparatus employed in
the manufacture of paper; whereby we are enabled to obtain a stronger and tougher
paper than by the ordinary methods of procedure. For this purpose, in converting
the pulp into paper we pass it between two continuous webs of wire gauze through
pressing rollers, so as to squeeze out the moisture or the greater part thereof, and
to press the fibres together on both sides alike.
In order more effectually to remove the moisture, one or both of the pressing
rollers may be perforated or grooved on the periphery, and clothed with porous
fabric, so that the principal portion of the moisture may escape through these pores;
and in some cases we prefer to connect the interior of such perforated pressing
rollers with a vessel in which a partial vacuum is maintained, so as to draw the
moisture more completely out of the pulp. Or, instead of employing vacuum rollers,
the double wire web with the pulp between may be passed over, under, or between
vacuum boxes.
For sizing the paper in continuous web, we pass it through a size trough under
or over a vacuum roller or vacuum box, so that the size solution is drawn through

page_text: the body of the paper, the surplus being squeezed out by pressing rollers. For
treating separate sheets in this manner we pass them successively through the
sizing trough between travelling webs.

page_text: Fig. 3 represents an arrangement in which a perforated or grooved vacuum
cylinder A is employed to assist in drawing the water from the pulp which is
carried over it between the travelling webs D and E. The rollers B, B, serve to
press out extra moisture, and the paper leaves them at F. The periphery of the
cylinder A may be covered with a felt or porous fabric.
Fig. 4 represents an arrangement, according to which the water is extracted from
the pulp between two travelling webs by the hugging action of three or more
rollers A, A, A. The pulp enters between the webs at B, and leaves them as paper
at C.
Fig. 5 is a modified arrangement having one cylinder A, which may have a
vacuum box B above it, and pressing rollers C, C, beyond it. The cylinder A may
be used without a vacuum box, and its circumference may consist of bars D, D, the
water being squeezed through the interstices between the bars. The pulp enters
at E and leaves as paper at F. A felt G may be used for removing the extra
moisture from the upper web.
For sizing or impregnating paper in the web or in sheets, the arrangement, shewn
at Fig. 3, is suitable, the paper having been passed through a sizing trough enters
at C, and leaves the travelling webs at F as sized paper.
Having thus described the nature of our Invention, and in what manner the
same is to be performed, we claim, in converting pulp into paper, squeezing it
between two travelling webs of wire gauze, substantially as and for the purposes
herein set forth.
In witness whereof, I, the said George Tidcombe, junior, have hereunto set
my hand and seal, this Twenty-second day of March, in the year of our
Lord One thousand eight hundred and seventy-eight.
G. TIDCOMBE, JUN (LS.)