Year: 1887

page_text: A communication from LOUIS WILLIAM SINSABAUGH, of Washington, in the District
of Columbia, United States of America, Engineer.
I, ALFRED JULIUS BOULT of 323 High Holborn, in the County of Middlesex,
M.I.M.E. 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 relates to the manufacture of gossamer water proof fabrics and
consists in the method and apparatus hereinafter described for producing said water-
proof fabrics the main improvement being that the final film of rubber coating is
arranged in the form of stripes.
In carrying this invention into practice a long sheet or piece of the material to be
coated with the rubber solution, is made in the form of an endless belt and is
supported by a pair of rollers which distend and move the fabric longitudinally in the
usual way to apply to it several successive coatings or thin films of rubber in solution
spread over the exterior surface by the ordinary straight edged knife as practiced
generally in making plain gossamer fabrics.
After the foundation coating is thus spread and while it is still fresh the straight
edge knife is removed and in its place a striping apparatus is substituted which will
now be described reference being had to the accompanying drawings forming a part
of this specification.
Fig. 1 is a perspective view of the bottom of the trough shaped knife used in
putting on the stripes of rubber.
Figs. 2 and 3 are sectional views.
Fig. 4 is a top or plan view of a portion of the trough knife.
Fig. 5 is a plan view of the fabric.
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page_text: fabric as already stated having been coated with a series of layers or films of the
rubber solution in the usual manner.
D indicates the trough shaped knife mounted in suitable supports and adapted to
receive the rubber compound in solution and deliver the same upon the fabric
through the perforations E formed in the bearing face of the trough D.
The perforations E extend into shallow grooves H, the number and width and
distance apart of the grooves determine the number and width and distance apart
of the stripes.
Without the grooves the rubber compound in solution will not form the stripes
properly as the cloth with its foundation coatings is sagged by the pressure of the
knife upon it and hugs up so close under the ridge of the trough knife that it prevents
the proper escape of the semi-liquid compound through the perforations, but with the
shallow grooves this difficulty is obviated.
In the manufacture of this improved fabric the use of this trough knife is preferred
for the reason that stripes of different colored rubber compounds can be applied
simultaneously by means of a partition G running through the trough.
In this instance the openings E are placed on each side of the partition staggered
as indicated in figure 4 or a number of partitions G may be otherwise arranged to
enable the operator to apply more than two different colored stripes as the finishing
film of rubber fabric.
The several perforations and grooves may of course be of different widths to form
wide and narrow stripes.
After the stripes of rubber have been applied to the fabric the next step in the
process is to render the fabric non-adhesive so that it can be rolled up and vulcanized
this is done by removing the trough shaped or other striping knife from the machine
and substitute therefore a straight edged knife and apply upon the fabric in front of the
knife a small quantity of dry farinaceous material preferably corn starch and move
the fabric longitudinally once through the machine, spreading said material uniformly
and smoothly with the straight edged knife over the entire surface of the fabric.
The straight edged knife is now removed and the fabric brushed with a rotary or
other suitable brush so as to remove as much of the farinaceous material as can be
readily detached mechanically without injuring the fabric.
The fabric is then treated with a solution of paraffine in naptha or an equivalent
thereof applied upon the surface in front of the replaced straight edged knife and the
fabric moved again through the machine beneath said knife.
This operation cleanses and freshens the surface of the fabric and in connection with
the farinaceous treatment renders it non-adhesive so that it may be rolled up and
removed for such further curing or vulcanization as the rubber may require.
Some method of vulcanization is necessary to prevent the rubber surface from
ultimately softening to an objectionable degree under heat or pressure and as a final
step in the process the fabric is exposed in the ordinary way to solar or artificial
heat for such length of time and under such conditions as will cure the rubber thereon.
Where a fabric is to be made with stripes of two colors only a serrated edges knife
may be used placed across the fabric in place of the straight edged knife, and in front
of it is placed a small quantity of the rubber solution of the color desired, to contrast
with that of the coatings first applied to the material and then move the fabric
longitudinally by revolving its supporting rollers until the fabric has made one
complete circuit, during which movement a limited portion of the striping compound
has passed through the notches of the knife edge and been deposited in parallel lines
upen the fresh rubber surface presented to it while said compound could not pass
except in the thinnest of films beneath the uncut portions of the knife edge alternating
with the notches thus producing a rubber striped surface upon the fabric the trough
knife just described may be used for making the fabric with two or more stripes of
contrasting colors.
The fabric thus produced is characterized by a velvety dull finish which is readily
distinguishable in the market from the shiny surface of the old style gossamer fabrics
and from the lustrous or glossy surface produced by a corn starch finish.

page_text: Having now particularly described and ascertained the nature of this invention as
communicated to me by my foreign correspondent, and in what manner the same is to
be performed, I declare that what I claim is :-
1. The described improvement in the art of making rubber striped water-proof
fabrics said improvement consisting in coating the web of the textile fabric with
successive films of rubber compounds in solution then knife coating upon such coated
surface stripes of a like solution of contrasting color and subsequently rendering the
compound or solution non-adhesive and curing it, as set forth.
2. The described improvement in the art of making rubber striped water-proof
fabrics the same consisting in coating the web with successive films of rubber
compound applying to such coated surface while fresh, stripes of like compound of a
contrasting color coating the striped surface with dry farinaceous material spread
uniformly thereon brushing such material away to expose said surface cleaning such
surface by a solution of paraffine in naptha and vulcanizing the rubber thereon for the
purpose set forth.
3. The improved gossamer fabric above described consisting of a woven fabric
coated with films of rubber in solution the finishing films forming rubber stripes as
set forth.
4. The improved gossamer fabric herein described consisting of a woven fabric
coated with films of rubber in solution the finishing film forming rubber stripes and
the surface being velvety or dull finished as distinguished from a lustrous or a printed
surface as set forth.
5. In a knife coating machine the trough knife D with perforations in its lower
edge and grooves extending from said perforations at right angles to the length of
the trough knife substantially as and for the purpose specified.
6. In a knife coating machine the trough knife D with perforations and grooves as
described and one or more partitions separating it into chambers substantially as and
for the purpose specified.
Dated this 20th day of December 1887.
W. P. THOMPSON & BOULT,
Agents.