Improvements in Blotting Paper and in the Manufacture of' the same.
Year: 1888

page_text: Improvements in Blotting Paper and in the Manufacture of'
the same.
I, JOHN HAWKE of Lapford House, New Barnet, in the County of Herts, Gentleman,
do hereby declare the nature of this invention to be as follows:-
This invention has for its object to produce an improved kind of blotting paper the
efficiency of which shall not depend solely upon its absorbent qualities but upon
chemical action with the wet ink on which it is used, by means of which the cost of
production can be cheapened, as less expensive material may be used for the pulp, and
the thinner kinds of colored blotting papers, such as those prepared for interleaving
Diaries, etc., nuch improved, as a smaller quantity of coloring matter than that now
used in them (by which their obsorbent properties are impaired) will be necessary.
The paper prepared according to this invention will also be lighter in weight in
proportion to its efficiency than all other blotting papers. The said paper can be
prepared inexpensively and will be economical in use.
The essential feature of my invention consists in the preparation of special blotting
papers and the improvement of the present kinds by using to mix with the pulp during
the process of manufacture water containing a protosult or a persalt of iron in
solution or of mixtures of the same (or salts of sodium) or water impregnated with
oxide of iron resulting from the decomposition of salts of iron or by adding to the
water used for the purpose of mixing with the pulp a solution of a protosalt or of a
persalt of iron or of mixtures of the same (or salts of sodium); or by treating the
material of the paper lator in the process of manufacture with such water
solutions, or in lieu of mixing either of the said iron solutions (or salts of sodium)
with the pulp of the paper or treating the material thereof, as before mentioned,
in impregnating or saturating ordinary paper suitable for the purpose, of the desired
substance, with a solution of a protosalt or of a persalt of iron or of mixtures of the
same (or salts of sodium) and allowing it to dry before using as blotting paper.
Dated this 28th day of March 1888.
or

page_text: COMPLETE SPECIFICATION.
Improvements in Blotting Paper and in the Manufacture of
the same.
JOHN HAWKE, Gentleman, of Lapford House, New Barnet Herts, do hereby declare
the nature of my invention for "IMPROVEMENTS IN BLOTTING PAPER, AND IN THE
MANUFACTURE OF THE SAME," and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:
This Invention has for its object the production of an improved kind of Blotting
Paper in which the absorbent qualities of the paper will be assisted by chemical action with
the wet ink on which it is used, whereby less expensive materials may be used for the pulp,
and Thinner Kinds of Colored Blotting Papers be produced of greater efficiency than
the Thin Blotting Papers generally in use, owing to a smaller quantity of coloring
matter which impairs their absorbent qualities, being necessary by my process.
The essential feature of my Invention consists in incorporating or combining the
protosalts or persalts of iron or of mixtures of the same (or salts of sodium) in solution
or water impregnated with oxide of iron resulting from the decomposition of salts of
iron, with the pulp from which blotting paper is to be made, or in impregnating
blotting paper with a solution of the said salts of iron or salts of sodium, whereby the
efficiency of Blotting Papers is increased, in relation to their cost.
In carrying out my Invention I either mix the protosalts or persalts of iron or
mixtures of the same (or Salts of sodium) in solution or water impregnated with oxide
of iron resulting from the decomposition of Salts of iron with the pulp when in the
process of manufacture of the Blotting Paper, or after suchi Blotting Paper has been
manufactured. When the Salts are to be mixed with the pulp it may be conveniently
effected by adding the same or a solution thereof to the material from which the
Blotting Paper is to be made, and which material is about to undergo the pulping
process in what is known as the pulping engine, but I do not confine myself to this
mode of preparation, as the said mixing or incorporation with the pulp may be effected
at any time during the process of manufacture. When the Blotting Paper, or paper
manufactured for that purpose is to be impregnated with the solution either by immer-
sion or damping I prefer to pass the paper from a cylinder or roll of paper through a
trough or vessel containing the same.
The proportion of Salts of Iron (or Sodium) to be employed will depend upon the
quality and thickness of the paper to be manufactured or prepared.
I have found that good results may be obtained, when the paper, whether it be of
the ordinary kind and impregnated after it is made, or if it be specially manufactured
of impregnated pulp, is at the time when it is used for blotting impregnated with
a solution of a salt of iron, the perchloride of iron for example, in such quantity
as that the paper shall contain about one and a half per cent. to about two and a
half per cent. of perchloride of iron calculated at Fe, Cl, and I find that the required
degree of saturation can be obtained by the employment of a solution of perchloride

page_text: of iron containing from about one and a half to two and a half per cent. of perchloride
of iron either to saturate the pulp in the process of manufacture, or to prepare a
paper made in the ordinary way for being employed as blotting paper according to
my Invention by saturating or impregnating it with iron solution.
Altho' I have mentioned the employment of perchloride of iron I wish it to be
understood that I do not limit myself to such compound as other soluble salts of iron
may be employed, but I prefer the perchloride on account of its economy.
When a solution of salts of sodium (I prefer the carbonate) is employed for the
immersion into or for the damping of the blotting paper when manufactured, I have
found that a solution of one part by weight of the common salts of sodium to four
parts weight of water gives good results, but these proportions vary, as the relative
proportion of the water should increase with the thickness of the paper employed.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to he performed, I declare that what
I claim is :
(1.) The incorporating or combining of Salts of Iron or a solution of the same or of
Salts of Sodium or a solution of the same with the pulp from which blotting paper
is to be made for the purpose hereinbefore described.
(2) The steeping or otherwise impregnating of blotting paper in or with Salts
of Iron or Sodium or a solution of either for tlie purpose hereinbefore described.
Dated this the Twenty first day of December 1888.