A Process of and Apparatus for Drying Viscous and like Substances.
Year: 1898

page_text: Date of Application, 10th Nov., 1898-Accepted, 17th Dec., 1898
COMPLETE SPECIFICATION.
A Process of and Apparatus for Drying Viscous and like Substances.
I, CARL MARTINI, of 15, Feldstrasse, Lehrte, near Hanover, in the Empire of
Germany, Engineer, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
When muddy or viscous substances are dried in the form of pulp or lumps,
the drying operation occupies a very long time as it proceeds from the exterior
to the interior, because a crust or cake is formed upon the outside of the sub-
stance to be dried, which renders the drying of the inner and still moist mass
difficult. With such a system of drying there is always present side by side
with the dry material some which is still wet, and the dry portion remains
exposed to the heat which is continuously applied and which is unnecessary and
in many cases absolutely prejudicial. This latter circumstance is more especially
of importance when it is a question of drying material which will not support a
high temperature.
The subject of this invention is an improved method of drying such muddy
or viscous masses in such a manner that previous to undergoing the drying
operation the substance to be dried is pressed through a sieve surface, such for
example as a perforated sheet or a plate provided with apertures so as to form
thin strings, so to speak. These strings or threads are dried almost instan-
taneously by the hot air stream passing over them, and this drying of the thin
string like particles which offer a very large surface, takes place without leaving
any wet internal portion; moreover the dried substance may be readily and
speedily removed from the heat.
By means of this process substances which should not be heated above a
certain temperature may be dried at a higher temperature as the drying tem-
perature is reduced to the permissible height by means of the condensed water
of the wet substance, whilst such substance may, when completely dry, be
immediately removed from the further action of the heat.
In the accompanying drawing, Fig. 1 illustrates in cross-section a device for
carrying out the above process, and
Figure 2 is a longitudinal section through the same.
The apparatus comprises a sieve e suspended in a trough h, the substance to
be treated being supplied to this sieve by means of a hopper a. By the rotation
of blades b obliquely arranged upon the arms c mounted upon the shaft d the
mass is pressed down through the bottom e and divided into downwardly
hanging strings which are very speedily dried by means of hot air entering the
apparatus at f and passing therefrom at g. The dried material breaks off of
itself upon touching the bottom of the trough h and may be readily removed
by means of a conveving screw or the like.

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is;
1. A process for drying muddy or viscous substances, characterised by the
fact that the substance to be dried is previous to the drying pressed through a
sieve and so formed into thin strings or threads and dried in this form.
2. A device or apparatus serving for carrying out the process described in
Claim 1, in which the substance to be dried is pressed through a perforated
bottom or sieve (e) by means of obliquely arranged blades (b) into the drying
chamber.
Dated this 10th day of Nawambon 1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.