Improvements in the Manufacture of Varnish.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Varnish.
I, ARTHUR JAMES SMITH, of No. 21, Park Row, Greenwich, in the County
of Kent. Analytical Chemist, do hereby declare the nature of this invention
to be as follows:-
The manufacture of varnish as it is at present carried on involves great labour,
difficulty and loss. Much of the expensive material employed goes to waste in
the process and the operation is accompanied by evolution of deleterious vapours.
My invention relates to means of overcoming these difficulties, rendering
the manufacture of varnish simple, easy and comparatively inexpensive.
For this purpose in a close vessel capable of sustaining great internal pressure
and provided with safety valve and pressure gauge, I gradually heat a mixture
of purified linseed or such like oil and gum, such as cowrie or copal, carrying
the heat up to 300° Fahr. or higher according to the character of the gum
treated. As the vessel is closed there is no escape of vapour causing loss or
nuisance as in the ordinary manufacture of varnish. The heat and pressure
are maintained for several hours, and then the contents of the vessel are allowed
to cool to a certain extent, and the necessary quantity of turpentine and driers
being added, the manufacture of the varnish is complete.
For heating the vessel I prefer to employ high pressure or superheated steam,
or water heated under pressure applied in a jacket or coil.
Dated this 8th day of February 1899.
ABEL & IMRAY,
Agents for the Applicant.
Improvements in the Manufacture of Varnish.
I. ARTHUR JAMES SMITH, of No. 21, Park Row, Greenwich, in the County
of Kent, Analytical Chemist, 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:-
1
The manufacture of varnish as it is at present carried on involves great labour,
difficulty and loss. Much of the expensive material employed goes to waste in
the process and the operation is accompanied by evolution of deleterious vapours.
My invention relates to means of overcoming these difficulties, rendering
the manufacture of varnish simple, easy and comparatively inexpensive.
For this purpose in a close vessel capable of sustaining great internal pressure
D
077

page_text: and provided with safety valve and pressure gauge, I gradually heat a mixture
of purified linseed or such like oil and gum, such as cowrie or copal, carrying
the heat up to 300° Fahr. or higher according to the character of the gum
treated. As the vessel is closed there is no escape of vapour causing loss or
nuisance as in the ordinary manufacture of varnish. The heat and pressure
are maintained for several hours, and then the contents of the vessel are allowed
to cool to a certain extent, and the necessary quantity of turpentine and driers
being added, the manufacture of the varnish is complete.
For heating the vessel I prefer to employ high pressure or superheated steam,
or water heated under pressure applied to a jacket or coil.
Having thus 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. The process of method herein described of manufacturing varnish, which
consists in introducing oil and gum into a closed vessel capable of sustaining
internal pressure, heating said gum and oil under pressure in said closed vessel,
until the gum is melted and mixed with the oil, then cooling the mixed gum
and oil and adding turpentine and a drier, substantially as set forth.
2. The herein described method of preparing varnish, which consists in heating
the oil and gum in a closed vessel under a high pressure, allowing the mixture
to cool, then adding turpentine and a drier, and then boiling in the same vessel,
substantially as described.
Dated this 7th day of November 1899.
ABEL & IMRAY,
Agents for the Applicant.