Improvements in the Treatment of "Sulphite Pulp" Used in the Manufacture of Paper and the like from Wood:
Year: 1894

page_text: Date of Application, 17th Feb., 1894
Complete Specification, Left, 6th July, 1891 - Accepted, 11th Aug., 1894
4
PROVISIONAL SPECIFICATION.-
Improvements in the Treatment of "Sulphite Pulp" Used in the
Manufacture of Paper and the like from Wood:->
:
I EDWARD PARTINGTON of Turn Lee Paper Mills, Glossop, in the County of
Derby, Paper Manufacturer, do, hereby declare the nature of this invention to be
as follows:-
"
This invention has for its object the purification of wood pulp (known in the
trade as "sulphite pulp") in the process of its manufacture.
In the manufacture of " sulphite pulp from wood, after the wood has been
digested, and washed with water, there is found in the pulp a certain amount of
pitchy or resinous matter which is not' perfectly soluble in water, but which adheres
more or less to the wood fibres in very minute particles and also to those vessels
or other parts of the machinery in which the fibres are being treated, eventually
forming thereon a black coating of a pitchy 'nature, which becomes smeared or
rubbed off the surface by the action of the moving pulp and forms dirty, specks
which deteriorate the value of the pulp.
'
In order to prevent the formation of these partly insoluble specks in the pulp,
and the partial coating of the vessels or parts of the machinery with the pitchy or
resinous matter previously named; according to my invention I add petroleum or
paraffin oil (or other suitable hydro-carbon) to the partly washed pulp in sufficient
quantities to render soluble the minute particles of pitchy or resinous matter in
the pulp which may then be washed out in the usual way known to paper makers.
I find that the proportion of petroleum or paraffin oil most useful for this purpose
is about six to eight quarts to one ton of 'air-dried pulp. If the boiling has been
carried' on a long time in the digester it requires a little less oil than when the pulp
has not been so well boiled, but I find the above proportion is about the average
quantity required per ton...
+16
By the use of this invention the vessels and other machinery used in the washing,
cleansing and treating of "sulphite pulp" can be kept perfectly clean, and free
from the objectionable coating of the pitchy or resinous matter and the pureness and
quality of the pulp will be greatly improved.
The method of applying the oil to the pulp can be varied to a considerable
extent; for example it can be added to the pulp when it is passing through the
"pulp-opener" by dropping in the oil with the pulp as it enters after which it is
well mixed with the pulp and comes in contact with and dissolves the pitchy or
resinous matter.
Or, the oil may be added in given proportions to quantities of pulp put into
washing engines, cisterns or the like, with the object of mixing and triturating
the same.
1
1
The most effective way however I find is to apply the oil to the pulp whilst the
fibres are being rubbed or separated by suitable machinery like a pulp opener,
rag-engine or "Hollander."
..
The oils which I use for the purposes of my invention are mineral hydro-carbon
oils such as petroleum or paraffin (either crude or refined) preferably of a specific
gravity of 800 to 850 and with a flashing point of from 80° to 120° Fahrenheit.
Dated this 16th day of February 1894.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in the Treatment of "Sulphite Pulp" Used in the
Manufacture of Paper and the like from Wood.
I EDWARD PARTINGTON of Turn Lee Paper Mills, Glossop, in the County of
Derby, Paper 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 has for its object the purification of wood pulp (known in the
trade as "sulphite pulp") in the process of its manufacture.
In the manufacture of "sulphite pulp" from wood, after the wood has been
digested, and washed with water, there is found in the pulp a certain amount of
pitchy or resinous matter which is not perfectly soluble in water, but which adheres
more or less to the wood fibres in very minute particles and also to those vessels or
other parts of the machinery in which the fibres are being treated, eventually
forming thereon a black coating of a pitchy nature, which becomes smeared or
rubbed off the surface by the action of the moving pulp and forms dirty specks
which deteriorate the value of the pulp.
In order to prevent the formation of these partly insoluble specks in the pulp,
and the partial coating of the vessels or parts of the machinery with the pitchy or
resinous matter previously named, according to my invention I add petroleum or
paraffin oil (or other suitable hydro-carbon) to the partly washed pulp in sufficient
quantities to render soluble the minute particles of pitchy or resinous matter in the
pulp, which may then be washed out in the usual way known to paper makers.
I find that the proportion of petroleum or paraffin oil most useful for this purpose
is about six to eight quarts to one ton of air-dried pulp. If the boiling has been
carried on a long time in the digester it requires a little less oil than when the pulp
has not been so well boiled, but I find the above proportion is about the average
quantity required per ton.
By the use of this invention the vessels and other machinery used in the washing,
cleansing and treating of "sulphite pulp" can be kept perfectly clean, and free from
the objectionable coating of the pitchy or resinous matter and the pureness and
quality of the pulp will be greatly improved.
The method of applying the oil to the pulp can be varied to a considerable
extent, for example it can be added to the pulp when it is passing through the
pulp opener" by dropping in the oil with the pulp as it enters, after which it is
well mixed with the pulp and comes in contact with, and dissolves, the pitchy or
66
resinous matter.
Or, the oil may be added in given proportions to quantities of pulp put into
washing engines, cisterns or the like, with the object of mixing and triturating
the same.
The most effective way however I find is to apply the oil to the pulp whilst the
fibres are being rubbed or separated by suitable machinery like a pulp opener, rag
engine or "Hollander."
The oils which I use for the purposes of my invention are mineral hydro-carbon
oils such as petroleum or paraffin (either crude or refined) preferably of a specific
gravity of 800 to 850 and with a flashing point of from 80° to 120° Fahrenheit.
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
The improvements in the treatment of "sulphite pulp" used in the manufacture
of paper and the like from wood, consisting in the application or addition to such
sulphite pulp" during the process of manufacture of petroleum or paraffin oil or
66

page_text: other suitable mineral hydrocarbon oils for the purpose of removing or preventing
the formation of partly insoluble specks of a pitchy or resinous nature in the said
pulp and for preventing the partial coating or fouling of the vessels or other] parts.
of the machinery therewith.
Dated this 5th day of July 1894.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant..