The story of paper-making : $b an account of paper-making from its earliest known record down to the present timeButler, Frank Osgood
History
The story of paper-making : $b an account of paper-making from its earliest known record down to the present time
Butler, Frank Osgood
Papermaking
When the screen has finished its work, the water carrying the pulp in
solution flows in an even stream, whose volume varies according to the
width of the web of paper to be produced, through a discharge-cock
onto the Fourdrinier or cylinder machine, as the case may be, each of
which will be duly described. This stream has a filmy appearance, and
is of diverse color, depending upon the shade of paper to be produced.
From its consistency, which is about that of milk, it is difficult to
imagine that it floats separate particles of fiber in such quantities
as, when gathered on the wire cloth and passed to a felt blanket and
then pressed between rollers, to form in a second of time a broad web
of embryo paper sufficiently strong and firm to take definite form.
Man’s mastery of the process by which this startling and wonderful
change is effected has come as one of the rewards of his long and
patient study.
The Fourdrinier machine, which preserves at least the name of the
enterprising developers of the invention, takes up the work that was
formerly done by the molder. The wire cloth upon which the fibers
are discharged as described is an endless belt, the full width of
the paper machine. Upon this the fibers spread out evenly, being
aided by a fan-shaped rubber or oil cloth, which delivers the smooth
stream under a gate regulated to insure perfect evenness and to fix
uniformly the fibers of the web now commencing its final formation.
♦Deckel-straps♦ Deckel-straps of india-rubber are fastened on both
sides of the wire screen, and move with it, thus holding the watery
pulp in place. The deckel-straps are adjustable, and fix or regulate
the width of the paper. These and the gate, or “slicer,” are attached
to what is termed the deckel-frame, which corresponds to the deckel
used by paper-makers in the days when the manufacture was carried on by
hand. ♦Endless wire cloth♦ As the stream flows onto the endless belt
of wire cloth, the water which has borne the fibers filters into the
trough beneath. Being charged with very fine fibers, size, coloring
matter, and other similar ingredients, it is carried back into the
pulp-chest, to save these materials, as well as to contribute again
to the extra supply of water needed. ♦The save-all♦ For this reason
the trough into which it falls from the revolving “wire” is called the
“save-all.” A shaking motion is imparted to the “wire” from the frame
upon which rest the rolls that keep it in its never-ending round. This
aids in draining away the water, and mats or interlaces the fibers
together. At the end of the “save-all,” where the fibers are to leave
the “wire” for the next stage of their journey, suction-boxes are
placed, provided with an air-pump to take up the surplus water that
has not yet found its way through the meshes. ♦The dandy roll♦ Between
these suction-boxes above the wire is a wire-covered roll, which
impresses the newly formed sheet; this impression cylinder is called a
Public-domain text, read in full here on John Shaqi.
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