IMPROVEMENTS IN THE TREATMENT OF THE MATERIALS WHICH HAVE BEEN BOILED WITH LYE OR LIME IN PREPARING THEM FOR THE MANUFACTURE OF PAPER OR FOR OTHER PURPOSES, AND IN THE APPARATUS TO BE USED IN SUCH TREATMENT.”
Year: 1879

page_text: PROVISIONAL SPECIFICATION left by James Robertson at the Office of
Commissioners of Patents on the 21st May 1879.
"
JAMES ROBERTSON, of Springfield Mills, Lasswade, in the County of Midlothian,
North Britain. IMPROVEMENTS IN THE TREATMENT OF THE MATERIALS WHICH
HAVE BEEN BOILED WITH LYE OR LIME IN PREPARING THEM FOR THE MANUFACTURE
OF PAPER OR FOR OTHER PURPOSES, AND IN THE APPARATUS TO BE USED IN SUCH
TREATMENT.”
The said Invention relates to improvements in the treatment of the materials
which have been boiled with caustic, or soda lye, or lime, in preparing them for
the manufacture of paper or for other purposes, and in the apparatus to be used in
such treatment, and has for its object to extract, eject, blow, or suck the strong or
concentrated lye or lime from the esparto grass, rag, or other material which has
been boiled in lye or lime for the purposes of paper-making or for other purposes,
the Invention being applicable in all cases where lye or lime is used for boiling
purposes.
At
In carrying out the said Invention after the said material has been boiled and the
lye drained off in the usual way, steam superheated or not, and at a high, low, or any
suitable pressure, is admitted to the vessel wherein the boiling operation was effected,
preferably at the upper part thereof through a pipe provided for the purpose.
the lower part of the said vessel is a pipe provided with a cock which is opened to
allow the strong lye or lime which is discharged from the material by the said
process to escape to a suitable receptacle. After the greater part of the lye or
lime has been discharged, the admission of steam may be discontinued, and water
(hot or cold, or of other suitable temperature,) may be admitted in the form of a
shower or spray or otherwise over the material, and for this purpose the vessel is
provided with a pipe which may terminate inside the vessel in a rose or perforated
nozzle. After this the water is turned off and steam is again admitted as before.
In place of using steam, air, hot or cold, or of other suitable temperature, may be
blown through the material in the boiling vessel, or the lye or lime may be
extracted by vacuum created at the lower part of the boiling vessel, the said vessel
in these cases being provided with blowing or exhausting apparatus which may be
of the ordinary kind, and communicate with the boiling vessel by pipes which may
be discontinued from or shut off from communication with the said vessel by
means of cocks or otherwise, whilst the said blowing or exhausting apparatus is
out of operation.

page_text: By this Invention the lye or lime is extracted or expelled from the material
after it has been boiled in a strong or concentrated and valuable state, and the
material washed clean much more rapidly and in a superior manner to that accom-
plished in the ordinary manner. Also less lye or lime will answer for boiling and
softening a given quantity of material. Moreover the discharged liquid from the
factories in which this Invention is employed is much less foul than that discharged
where the materials are treated in the ordinary way.