A Process for Impregnating Down with Pulverized Rosin 1.
Year: 1898

page_text: Date of Application, 28th July, 1898-Accepted, 1st Oct.,
1898
COMPLETE SPECIFICATION.
A Process for Impregnating Down with Pulverized Rosin
1. HUGO BERGER, of 8, Friedrichstrasse, Berlin, in the Empire of Germany,
Manufacturer of Counterpanes and Quilta, do hereby declare the nature of this
invention und in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
The ordinary eider and other downs have, as is well known, many defects owing
to which they are useless for filling cases made of particularly fine material, but
the chief defect is that the down passes through the seams as well as through the
material while it cannot be weighed in open receptacles as the least draught of air
scatters the down about.
It has been accordingly necessary to provide better casings for such downs which
however did not remedy all the above defects but caused the feather beds, eider
down quilts and the like to be very much more expensive. Furthermore in fine
silky material of light color and particularly in somewhat transparent material,
the dark color of the down showed through and spoiled in this manner the appear-
ance of the casing.
All these defects are remedied by the present impregnating process for ordinary
down. By this process, the down is rendered as valuable as eider down, while
the price is much lower than heretofore. The downs impregnated according to
this improved process pass no more through the material, retain their beautiful
white color as well as their elasticity, are free from dust, while its action is not
diminished but increased by the influence of corporal heat.
In the accompanying drawings is shown by way of example a drum which is
used in carrying the process into practice. The impregnation of the down follows
in the proportion of 10 gr. of light powdered rosin (colophony) in a state resemb-
ling flour to 100 gr. of down and the impregnation takes place in a drum a wherein
is mounted a shaft a provided with paddles or vanes. The down and the powdered
rosin are thoroughly mixed by the vanes or paddles when the drum is heated from
below to a temperature of about 40° C. by means of a perforated gas pipe 6 this
heating taking place while the shaft is being rapidly rotated with its paddles
or vanes. It is obvious that the heating may be carried on by the aid of steam.
The impregnation of the down obviates the need for the special linings used for
sewn casings such as had to be used heretofore, and hence the casings will here-
after be much lighter in weight.
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;-
A process for impregnating down with powdered rosin for the purpose of enabling

page_text: down proof casings to be used without a lining and consisting in mixing the down
with the powdered rosin and then heating it to a temperature of about 40° C.
Dated this 27th day of July 1898.
CRUIKSHANK & FAIRWEATHER,
Chartered Patent Agents, 62, Saint Vincent Street, Glasgow,
Agents for the Applicant.