Improvements in the Manufacture of Animal Glue.
Year: 1892

page_text: Date of Application, 31st Aug., 1892-Accepted, 1st Oct., 1892
COMPLETE SOIFICATION.
Improvements in the Manufacture of Animal Glue.
I, ERICH BRAND of Rostock, Mecklenburg, in the German Empire, Merchant,
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 :-
This invention relates to a process for the production of animal glue in such
a form that it may be supplied to users and kept for an unlimited time ready
for immediate use without smell and without affecting its tenacity or holding
power. The invention has for object to supersede the existing method of manu-
facturing animal glue in the form of cakes or sheets dried to hardness, this
dried form and the large additional expense attendant thereon being necessary
to preserve the glue from deterioration.
The process, in the bone, leather or skin glue manufacture, consists in adding
to the boiling hot glue water a solution of borax and calcined potash.
By the
addition of borax a good keeping property is given to the glue but this property
is not lasting because the borax does not have a sufficiently strong alkaline
effect to kill the corrupting bacteria in the glue gelatine.
To give the desirable durability to the glue in the soft state calcined potash
is added, thereby bringing about an intimate combination of the borax and also
the alkali with the glue water so as to prevent the crystallisation of the borax
and its separation from the gelatinous glue.
The process is performed by dissolving 60 kilogrammes of pulverised borax in
100 kilogrammes of water to which in the boiling state 4 kilogrammes of
90 per cent. calcined potash is added the whole being made to boil and then
passed into 1450 kilogrammes of boiling hot glue water or liquor shewing 12° by
the hydrometer, stirring being constantly done.
The glue produced by this process presents the advantages hitherto unobtainable
that its keeping properties and its freedom from smell are lasting without being
made worthless for many purposes by injurious ingredients and that it may be sold
in a state suitable for immediate and direct application. Painted work when
coated over with the glue of this invention is rendered more durable. It is also
useful in the carpet manufacture, leather manufacture and in book binding. The
process may also be employed for rendering the dry cake glue useful for many
purposes by giving it keeping qualities with freedom from smell even when it
contains injurious acids the bad effect of which is thereby destroyed. To this end
the dry cake glue is again reduced to boiling hot glue water and the aforesaid
solution then stirred into the same.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The process for the production of animal glue keeping and remaining free
from smell for an unlimited time, consisting in adding calcined potash to a mixture
of borax and water in the boiling state and passing this solution into the boiling
glue water whilst being constantly stirred, substantially as described.
2. The application of the process referred to, to dry cake or sheet glue for the.
purpose specified, substantially as described.
Dated this 31st day of August 1892
CAPITAINE & VON HERTLING,
89, Chancery Lane, London, W.C., Agents for the Applicant..