The Manufacture of Paper: With Illustrations, and a Bibliography of Works Relating to Cellulose and Paper-MakingSindall, R. W. (Robert Walter)
History
The Manufacture of Paper: With Illustrations, and a Bibliography of Works Relating to Cellulose and Paper-Making
Sindall, R. W. (Robert Walter)
Papermaking
The beaten pulp, contained in a vat placed below the wire, was thrown
up in a continual stream upon the surface of the wire, and carried
forward towards the squeezing rolls. A shaking motion was imparted to
the travelling wire so as to cause the fibres to felt properly. A great
deal of the water fell through the meshes of the gauze, and further
quantities were removed by means of the press rolls. The wet paper was
then wound up on to a wooden roller, which was taken out as soon as
sufficient paper had been made.
[Illustration: FIG. 5.--The Improved Paper Machine of A.D. 1810.]
The whole process was carried on under great difficulties, but
substantial improvements were soon made by the enterprising
Fourdriniers, who commenced operations in Bermondsey, employing Mr.
Bryan Donkin, then in the service of Messrs. Hall & Co., of Dartford,
who had shown himself keenly interested in the machine. In 1803 the
first "Fourdrinier," so called, was built at Bermondsey, and erected at
Two Waters Mill in Herefordshire.
In this machine the mixture of pulp and water was carried forward
between two wires, and, after passing through the couch rolls,
transferred to an endless felt. This arrangement proved to be faulty
because the water did not escape freely enough from the wire, and a
great deal of the paper was spoilt.
Donkin, however, hit upon a simple but effective device for curing this
fault by altering the relative position of the two couch rolls. Instead
of keeping the two rolls exactly in a vertical position one over the
other, he placed them at a slight angle so that the upper one should
bear gently on the web of paper carried by the wire before receiving
the full pressure of the rolls, and thus remove a greater proportion of
the water. In this way the paper was firmer and less liable to break
when pressed between the couch rolls, an additional advantage being
secured in the fact that the upper wire could be dispensed with.
The various improvements effected resulted in a machine the details of
which appear in the appended diagram, the device of the inclined couch
rolls being fitted about 1810.
The mixture of water and pulp flowed from a stuff chest into a small
regulating box and on to the wire over a sloping board. The pulp at
once formed into a wet sheet of paper, the water falling through the
meshes of the wire, being caught in a bucket-shaped appliance, and
conveyed back to the regulating box. The stream of pulp was confined
upon the wire by means of a deckle. Further quantities of water were
removed by the aid of a pair of squeezing rolls before the web passed
through the couch rolls after which the paper was reeled up on a wooden
spindle.
Public-domain text, read in full here on John Shaqi.
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