Researches on Cellulose, 1895-1900Cross, C. F. (Charles Frederick)
Science
Researches on Cellulose, 1895-1900
Cross, C. F. (Charles Frederick)
Cellulose
In the oxidising processes which follow the alkaline treatments, the
hypochlorites are still the staple agents. Owing to the steady relative
fall in the selling prices of the permanganates these are coming into
more extensive use, but the consumption is still small, and they are
mainly used for certain special effects, chiefly in linen or more
generally flax cloth bleaching.
~Paper-pulp Spinning.~--Paper is a continuous web or fabric produced by
the interlocking of the structural fibrous units of the well-known short
length. In Japan and other countries paper is made to serve for all or
some of the purposes for which we employ string or twine, and to give
the necessary tensile strength the paper is twisted or rolled on itself.
Such twisting, however, adds nothing to the intrinsic tensile qualities
of the original paper.
A new technical effect is realised in this direction by the treatment of
paper-pulp in the process of its conversion into a continuous web: The
pulp is formed into continuous strips of convenient breadth (usually
from 2 to 8 mm.), these receive a 'rolling-up' treatment immediately
following the squeeze of the press rolls by which the superfluous water
is removed: they are then further but incompletely dried, and in this
condition are subjected to a final spinning or twisting treatment on
ring-spinning machinery of special construction.
Such a process was originally patented by C. Kellner in this country
(E.P. No. 20,225/1891), and is fully described in his specification.
Later improvements in detail were patented by G. Tuerk (E.P. 4621/1892).
A joint system is now being industrially developed in Germany by the
Altdamm-Stahlhammer Pulp and Paper Company under the technical direction
of Dr. Max Mueller, and there appears to be every prospect of the product
taking a position as a staple textile.
The process has only the incidental interest in connection with our main
subject, that it employs chiefly the 'chemical' pulps or celluloses as
raw materials. The industrial future of the application must, of course,
be largely determined by costs of production, as the directions of
application in the weaving industries will be limited by the necessarily
inferior grade of tensile strength belonging to these products and the
degree by which this is lowered on complete wetting. All these questions
have been duly weighed by those engaged in this interesting development,
and the conclusion of those qualified to judge is that the new industry
has vindicated for itself a permanent position.
Public-domain text, read in full here on John Shaqi.
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