Great Facts: A Popular History and Description of the Most Remarkable Inventions During the Present CenturyBakewell, Frederick C. (Frederick Collier)
History
Great Facts: A Popular History and Description of the Most Remarkable Inventions During the Present Century
Bakewell, Frederick C. (Frederick Collier)
Inventions
The wire gauze, on to which the pulp is poured, is about 4 feet wide,
and 25 feet long, and it is kept constantly moving onwards, by rollers
at each end, over which it passes. The gauze is stretched out perfectly
level, and the pulp is prevented from flowing over the edges by straps
on each side, which limit the width of the paper. As the endless
wire cloth moves along, an agitating motion is given to it, by which
means the pulp is spread evenly over the surface; the water is also
drained off through the interstices of the gauze, and this part of the
process is expedited in the improved machines by producing a partial
vacuum underneath. Before the sheet of pulp has arrived at the farther
extremity of the wire cloth, it passes between two cylinders, the under
one of which is of metal, covered with felt, and the upper one of wood.
A slight pressure given to the pulp in passing between those cylinders
imparts sufficient tenacity to it to enable it to be transferred from
the wire gauze on to an endless web of felt, by means of a slice that
clears the pulp from the wire gauze, and deposits it on the felt. The
latter is kept moving at exactly the same speed as the wire gauze,
otherwise there would be either a rent or a fold on the sheet. The
paper, still in a very wet state, is carried between cast iron rollers,
and its fibres are forcibly pressed together, which operation squeezes
out the water, and so far gives tenacity to the pulp that it may be
handled without tearing. The sheet then passes on to other rollers, by
which it is further compressed, and its surface smoothened. The paper
is, however, still damp, and requires to be dried. This is done by
passing it over large metal cylinders, heated by steam. The process of
making the paper is then completed, and the continuous sheet may be
wound upon a reel to any length; but it is now usual to cut it up into
sheets as soon as it leaves the drying cylinders.
The wire cloth moves at the rate of from 25 to 40 feet per minute, and
such a machine would consequently make at least 10 yards of paper in
that time, which is equal to a mile in three hours. The width of the
paper is usually about 4½ feet, therefore each machine will make 10,450
square yards of paper in twelve hours; and there are upwards of three
hundred of such machines at work in this country. The value of the
paper thus produced is calculated to exceed two millions sterling.
Public-domain text, read in full here on John Shaqi.
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