Improvements in the Production and Manufacture of Paper having Water-proof, Non-conducting, and other Valuable Properties and Qualities.
Year: 1888

page_text: Date of Application, 12th Mar., 1888
Complete Specification Left, 1st Jan., 1889
Complete Specification Accepted, 9th Mar., 1889
PROVISIONAL SPECIFICATION.
Improvements in the Production and Manufacture of Paper having
Water-proof, Non-conducting, and other Valuable Properties and
Qualities.
We TRUMAN JUNIUS PEARCE of No. 664 Tenth Street, Oakland, in the State of
California, in the United States of America, Inventor, and MELVIN WARREN
BEARDSLEY, of No. 1316 Grove Street Oakland, in the said state of California, Oil
Refiner, do hereby declare the nature of this invention to be as follows:-
Our invention relates to the production and manufacture of a paper for general use
as well as for many special purposes where a wrapping covering or lining is required
that will afford complete protection from air and moisture that will be unaffected by
exposure to heat or cold and the action of acids and alkalies, and that will be free
from odor. We have discovered that paper coated impregnated or saturated with
Maltha will acquire several valuable properties and qualities which will not deteriorate
under exposure and use, but will endure for an indefinite length of time. It will
withstand extremes of heat and cold and will be found highly useful for a non-
conducting lining or covering. It is waterproof and weatherproof and will resist
acids and alkalies to a remarkable degree. Its natural flexibility not being materially
affected by the process of manufacture or treatment it will be suitable for wrapping or
packing goods or merchandise where protection from air and moisture, salt water
and other injurious agencies is desired.
It will be found useful also for many purposes and in many situations where tarred
paper and similar material can not be employed to advantage because of the unpleasant
and objectionable odor, for when properly prepared our paper is free from odor.
Our invention consists therefore in the production of a non absorbent non conducting
waterproof and odorless paper of various grades and qualities of thickness body and
surface with Maltha as hereinafter explained.
The substance or product known as Maltha which we employ and utilize in the
manufacture of our said paper is the solid residuum obtained in the distillation of the
heavier grades of petroleum. As procured from oil refineries in many localities it is

page_text: sufficiently free from earthy and other foreign solid matter to be used without any
preparatory treatment, but where it is found or obtained in a more or less unclean
condition it is necessary to eliminate the sand and other impurities mixed with it before it
is suitable for the purpose. Where this condition is obtained the Maltha is melted
and reduced to a consistency sufficiently fluid to enable it to be applied to the paper,
and in this condition being maintained during the operation the paper is coated and for
some purposes is saturated with the material by using suitable machinery for applying
it in an uniform manner. The Maltha is kept as nearly as possible at uniform
temperature for this purpose and sufficiently fluid to work well.
A temperature of from 150 to 250 degrees Fahrenheit will keep the Maltha at
suitable consistency for general use.

page_text: COMPLETE SPECIFICATION.
Improvements in the Production and Manufacture of Paper having
Water-proof, Non-conducting, and other Valuable Properties and..
Qualities.
We, TRUMAN JUNIUS PEARCE, of No. 664 Tenth Street, Oakland, in the State of
California, in the United States of America Inventor, and MELVIN WARREN
BEARDSLEY, of No. 1316 Grove Street, Oakland, in the said state of California,
Oil-refiner, 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 :-
Our invention relates to the production and manufacture of a paper for general use
as well as for many special purposes where a wrapping, covering, or lining is required
that will afford complete protection from air and inoisture, that will be unaffected by
exposure to heat or cold and the action of acids and alkalies, and that will be free
frou odor.
We have discovered that paper coated, impregnated or saturated with maltha will
acquire several valuable properties and qualities which will not deteriorate under exposure.
and use, but will endure for an indefinite length of time. It will withstand extremes..
of heat and cold and will be found highly useful for a non-conducing lining or covering.
It is water-proof and weather-proof and will resist acids and alkalies to a
remarkable degree. Its natural flexibility not being materially affected by the process
of manufacture or treatment, it will be suitable for wrapping or packing goods or
merchandise where protection from air and moisture, salt water and other injurious
agencies is desired. It will be found useful also for many purposes and in many
situations where tarred paper and similar material cannot be employed to advantage
because of the unpleasant and objectionable odor; for when properly prepared our
paper is free from odor.
Our invention consists therefore in the production of a non-absorbent, non-
conducting, water-proof and odorless paper of various grades and qualities of thickness,
body and surface, with maltha as herinafter explained.
The substance or product known as maltha which we employ and utilize in the
manufacture of our said paper is the solid residuum obtained in the distillation of the
heavier grades of petroleum. As procured from oil refineries in many localities, it is
sufficiently free from earthy and other foreign solid matter to be used without any
preparatory treatment, but where it is found or obtained in a more or less unclean
condition it is necessary to eliminate the sand and other impurities mixed with it
before it is suitable for the purpose.
When this condition is obtained the maltha is melted and reduced to a consistency
sufficiently fluid to enable it to be applied to the paper, and in this condition being
maintained during the operation the paper is coated and for some purposes is saturated
with the material by using suitable machinery for applying it in an uniform manner.
An apparatus which we have used to good advantage consists of a vat or receptacle

page_text: with a furnace or steam-heater beneath it and a set of rollers. In preparing our paper
it first passes through the maltha in the vat and then passes on to the rollers
which spread the material on to the paper and make it of any uniform thickness
required. The rollers should have suitable adjustability as to the space between
them and the degree of pressure with which they act on the paper to properly
distribute the maltlin on the two sides of the paper. By this means the paper can
be treated at a single operation in going once through the apparatus, but additional
coats or an increased degree of saturation can be obtained by running the paper
through again.
For thinner paper, such as manilla paper, we use scrapers.
In this manner wo run
the paper through the vat and then under and over the scrapers which may be formed
of thin blades arranged alternately above and beneath the paper to act on both sides
or surfaces thereof as it is drawn through them, these scrapers being kept hot by steam
or other means. This forms a better mode of applying the coating.
The maltha is kept as nearly as possible at uniform temperature to maintain the
desired consistency and in a condition sufficiently fluid to work well.
A temperature of from 150 to 250 degrees Fahrenheit will keep the maltha at
suitable consistency for general use. All grades of paper from thin to the thickest
and heaviest kinds can be treated with the maltha to produce any desired weight,
strength or thickness of our improved articles, and by having suitable arrangement of
rollers for carrying the paper after being treated until it is sufficiently dry to be rolled
we can treat paper in the roll as well as in sheets.
An excellent article for use as a non-conducting lining for refrigerators and cold-air
rooms and for like purposes is produced by covering or saturating heavy paper or
straw-board with naltha.
From the foregoing description any person skilled in the art of coating or treating
paper with substances that require to be applied warm or in a melted condition
will understand how to produce our improved article in any grade or character of
thickness weight and stiffness.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
As a new article of manufacture and of commerce, paper coated or saturated with
maltba, substantially as herein set forth.