Improvements in Waterproof Cloth for Protecting Goods in Bales and the like.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Waterproof Cloth for Protecting Goods in Bales and
the like.
1, JOHN DUNCAN BLACKWELL, of Gorse Bank, Chapel Street, Hyde, in the County
of Chester, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to an improvement in the manufacture of waterproof
cloth such as is employed for protecting goods in bales. The object of this inven-
tion is to produce a waterproof cloth that is pliable and light but strong, and that
will not be injuriously affected by variations of temperature. The oil cloth that
is now and has hitherto been employed for the purpose herein before named fre-
quently becomes brittle and cracks, and also increases considerably the weight
of the bale by the heavy substances of which it is composed. For the purpose of
this invention I use plain cotton cloth preferably finished by calendering so as to
have a smooth surface. In order to render said cloth waterproof I employ a compo-
sition consisting, in or about the proportion, of two parts of cotton seed pitch to
one part of stearine pitch that is melted, and when in a boiling state I pass the
cloth through the tank containing said composition. As the cloth is drawn from
the tank it is caused to pass between two knives that are set to a gauge and by
which a thin coating of the aforesaid composition is retained on the cloth which is
then received by and passed through a mangle whose rollers are filled with cold
water by which their surfaces are chilled the cloth being thereby cooled and finished
ready for immediate use. When goods in bales are encased in waterproof cloth
such as is herein before described, and put under hydraulic pressure, the edges at
the folds of the protecting cloth will unite or adhere and perfectly protect the
goods from injury from water.
·ות
Improvements in Waterproof Cloth for Protecting Goods in Bales and
the like.
I, JOHN DUNCAN BLACKWELL, of Gorse Bank, Chapel Street, Hyde, in the County
of Chester, Manufacturer, do hereby declare the nature of this invention and in

page_text: what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement;-
This invention relates to an improvement in the manufacture of waterproof
cloth such as is employed for protecting goods in bales. The object of this inven-
tion is to produce a waterproof cloth that is pliable and light but strong, and that
will not be injuriously affected by variations of temperature. Oil cloth that is
now and has hitherto been employed for the purpose herein before named frequently
becomes brittle and cracks by the nature of the substances, such as beetled lineu
cloth of which it is composed. In the preparation of waterproof cloth according
to this my invention I employ as a foundation, plain cotton cloth of a close texture
in which specially heavy yarns have been used in the manufacture of said cloth,
and which is finished by calendering so as to have a smooth surface. I obtain
a waterproof composition by melting cotton seed pitch and stearine pitch either
in equal proportions or in the proportion of two parts of cotton seed pitch to one
part of stearine pitch, or in the reverse proportions according to the character
and quality of the waterproof cloth it is desired to produce. Said waterproof
composition is heated, and when in a boiling state the plain cotton cloth herein
before named is passed through the tank containing the composition by drawing
the cloth over and under rollers fitted in a tank containing said composition. As
the cloth is drawn from the tank it is caused to pass between two knives that are
set to a gauge and by which a thin coating of the aforesaid composition is retained
on the cloth which is then received by and passed through a mangle whose rollers
are filled with cold water, by which their surfaces are chilled, the cloth being
thereby cooled and finished ready for immediate use.
When goods in bales are encased in waterproof cloth such as is hereinbefore
described, and put under hydraulic pressure, the edges at the folds of the protecting
cloth will not break, but will unite or adhere, and perfectly protect the goods from
injury from water.
Having now particularly described and ascertained the nature of this my said
invention and in what manner the same is to be performed I declare that what
I claim is
1st. Waterproof cloth that is manufactured by the employment of plain cotton
cloth of a close texture woven with heavy yarns as a foundation and waterproofed
with a composition of cotton seed pitch and stearine pitch in the manner and for
the purpose substantially as herein before described.
2nd. In the manufacture of waterproof cloth the use of a composition consisting
of cotton seed pitch and stearine pitch either in equal or other preferred proportions
substantially as and for the purpose herein before described.
3rd. Waterproof cloth such as is or may be employed for protecting goods in
bales and for other purposes manufactured substantially as herein before described.
Dated this 28th day of December 1897.
THOMAS PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for the Applicant.