Improved Manufacture of Paper and Cardboard.
Year: 1891

page_text: Date of Application, 16th Apr., 1891
Complete Specification Left, 13th Jan., 1892-Accepted, 13th Feb., 1892
PROVISIONAL SPECIFICATION.
Improved Manufacture of Paper and Cardboard.
1, CARL LENZ, of 111 Marxergasse 9, Vienna, Austria, Manufacturer, do hereby
declare the nature of this invention to be as follows:-
This invention relates to an improved manufacture of paper and cardboard
whereby the material for the production thereof is subjected to a treatment in the
rag engine which renders the paper or cardboard made therefrom impervious to
moisture.
The processes heretofore employed for this purpose consisted either in the
treatment of the finished product with sulphuric acid, tar, wax or the like, or in
adding to the pulp material, in addition to the substances employed for sizing, such
as animal or vegetable glue or resin soap, tannin or sulphate of alumina.
The results obtained in this way were however not satisfactory, because no great
strength nor any sufficient degree of imperviousness was imparted to the product
thereby.
According to my present invention these defects are obviated by adding chrome
alum to the stuff in the rag engine, in addition to resin soap and sulphate of
alumina, whereby the fibres of the material are not only made to adhere more
firmly together in the finished material, but they are brought into such a condition
as to offer greatly increased resistance to the action of water than is possible
with existing processes of preparation.
The material thus produced is therefore applicable with advantage for packing
paper or cardboard, floor coverings seats and backs of chairs, sieve frames, soles for
boots and shoes &c.
The process is as follows:-
There is added to every hundred parts by weight of dry stuff in the rag engine,
four parts by weight of resin soap, made of the best resin, and four parts by weight
of sulphate of alumina, and the whole is treated for about half an hour in the rag
engine.
There is then added from one to two parts by weight of chrome alum dissolved
in hot water, and the stuff is worked for another twenty minutes in the rag engine,
after which the stuff' can be made into paper or cardboard in the usual manner.
The chrome alum imparts to the glutinous materials in the paper or cardboard
the property that they do not dissolve under ordinary contact with water, thus
rendering the paper or cardboard waterproof.
Dated this 16th day of April 1891.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improved Manufacture of Paper and Cardboard.
1, CARL LENZ, of II Marxergasse 9, Vienna, Austria, Manufacturer, 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 an improved manufacture of paper and cardboard
whereby the material for the production thereof is subjected to a treatment in the
rag engine which renders the paper or cardboard made therefrom impervious to
moisture

page_text: The processes heretofore employed for this purpose consisted either in the
treatment of the finished product with sulphuric acid, tar, wax or the like, or in
adding to the pulp material, in addition to the substances employed for sizing,—
such as animal or vegetable glue or resin soap,-tannin or sulphate of alumina.
The results obtained in this way were however not satisfactory because no great
strength nor any sufficient degree of imperviousness was imparted to the product
thereby.
According to my present invention these defects are obviated by adding chrome-
alum to the stuff in the rag engine in addition to resin soap and sulphate of
alumina, whereby the fibres of the material are not only made to adhere more
firmly together in the finished material, but they are brought into such a condition
as to offer greatly increased resistance to the action of water than is possible
with existing processes of preparation.
The material thus produced is therefore applicable with advantage for packing
paper or cardboard, floor coverings, seats and backs of chairs, sieve frames, soles
for boots and shoes &c.
The process is as follows:-
There is added to every hundred parts by weight of dry stuff in the rag engine,
four parts by weight of resin soap, made of the best resin, and four parts by weight
of sulphate of alumina, and the whole is treated for about half an hour in the rag
engine.
There is then added from one to two parts by weight of chrome alum dissolved
in hot water and the stuff is worked for another twenty minutes in the rag engine
after which the stuff can be made into paper or cardboard in the usual manner.
The chrome alum imparts to the glutinous materials in the paper or cardboard
the property that they do not dissolve under ordinary contact with water, thus
rendering the paper or cardboard waterproof.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. Process for rendering paper and cardboard impermeable to moisture wherein
the material employed is first treated with resin soap and sulphate of alumina, and
then with chrome alum, substantially as described.
2. Paper and cardboard rendered impervious to moisture by the treatment of the
material thereof with resin soap, sulphate of alumina and chrome alum, substantially
ns described.
Dated this 13th day of Jan 1905
ABEL & IMRAY,
Agents for the Applicant.