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Патент USA US2131981

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Oct. 4-, 1938..
Filed March 18, 1955
7.2:. ghephirj
Patented-Oct. 4, 1938
Thomas Lewis Shepherd, London, England
Application March 18, .1935, Serial No. 11,720
InGreat Britain March 221, 1934i
6 Claims. ‘(CL 117-2)
This invention relates to elastic or rubber
whereby a rubber thread may be coated‘ as will ' I
threads or yarns which are intended to be subse—
quently used in the manufacture of fabric,
hereafter be described;
> Figure 2 is aviewbf two coatedthreads being
clothing, lacework and the like or parts thereof
twisted together;
5 or for‘ wearing apparel of any description.
Such a yarn is usually made by ?rst forming
a core of a rubber ?lament or thread which has
been either extruded into a coagulating or spinning bath, or has been cut from a sheet of rub10 ber, and such ?lament is then covered with a
double helical winding of cotton, silk and the
like of relatively opposite twist so as to form
as it were a ?brous jacket or covering to the
rubber core. This ?brous covering will constl15 tute a protection to‘the‘ core when the threads
or yarns are laid‘across one another as will re-
sult when the yarn is being woven or knitted
into a fabric, so that the intercrossing cores will.
not cut into one another.
Such. a fabric covering is not altogether suc-
Figure 3 is a diagrammatic view of apparatus 5
for extruding ,a- thread.
Th'erubber thread is to be coated with com
minuted material and a suitable adhesive ,is pre
pared, so that the comminuted material is held.
in suspension. The thread bto be covered is now 10
drawn or‘ otherwise passed under rollers eand
‘through the mixture (1 in a bath 0 in the man.
her shown inFigure 1 'sothat it will pick up a
coating of the mixture,,i. e. the solution and the
comminuted material. When the thus .coat'ed vl5
thread leavesthe receptacle, it is subjected to a
squeezingor pressing action by the rollers ffto
consolidate the coating and bring it into .inti
~mate contact with the ‘thread.- The coated
thread is then led away for drying, after which 20
cessful in practice, because the twisted convo- ' a vulcanizing or a hardening treatment may be
lutions of the ?brous covering may and do exert
an undesired in?uence on the degree of stretch
t0 be given to the elastic yarn. and interfere
25 with its contractibility back to normal size. The
application of the ?brous covering is expensive
and requires to be very carefully executed, and
again the ?brous covering possesses a tendency
to creep 01‘ move relatively to the core.
Moreover, when rubber threads are to be led
such a system‘of coating thread may be ex
tended to the manufacture of compound threads
or yarn according to which and referring to Fig- 25
ure 5, two (or more) threads of rubber m in an
unvulca'nized or tacky condition are‘ brought‘
together and twisted or doubled one upon the
other. These threads which have already been
coated as shown at n with the ?nely divided or 30
into a loom or knitting machine so as to be
formed into a fabric, it is very often dif?cult
to control the rubber threads because of the
results in the fabric when completed having a
comminuted material or have had such material
incorporated therein and under tension or not
are then twisted together as shown at o by any
suitable means (not shown) and while this twist—,
ing proceeds the ?nely divided material already 35
present on each thread becomes ?rmly amalga- '
non-uniform surface appearance or causes shire
mated and mixed with the doubled thread 0 '
extensive and variable stretch that they possess
35 and the result of this capacity of the thread
ring and other defects in the ?nished material.
The object of the invention, hereinafter de40 scribed is to overcome this last mentioned defect
and also to prevent the threads cutting into one
another when they are laid across one another
or across textile threads as is the case when
they are woven into a fabric.
Other objects and advantages will appear from
the following description.
I find that by using comminuted material ac-
cording to the invention, a thread maybe produced which is resistant to’ cross-cutting, does
50 not possess a frictional surface, possesses reduced
extensibility, and may be dyed.
The invention will now be described by way
of example with reference to the accompanying
drawing in which—
Figure 1 is a diagrammatic view of a device
which can now be described-as yarn, and it
will be understood'that an additional quantity
of the coating mixture as indicated at 10 may be 40
added as ‘the manufacture of the compound
thread proceeds.
The rubber thread to be used according to any
of the above arrangements may be produced in
various ways, for instance it maybe formed by 45
extruding or otherwise or it may be a thread al
ready vulcanized.
Additional comminuted material may also be
mixed in suspension in the bath containing the
rubber solution and the mixture extruded 50
through nozzles as usual into a coagulating
bath, which system will be hereafter referred to
in connection with Figure 3, the resulting rub
ber thread being then coated as described above.
The adhesive when used may be any kind 55
coagulated in passing through the coagulating ,
which is suitable and may comprise rubber, Cel
liquid w, the thread being subsequently led away
luloid, cellulose, a suitable varnish, a resin, syn
under a suitable tension if desired over a roller :1:
thetic or natural, glue, linseed oil and the like.
for subsequent treatment including the coating
Further, it may have a consistency which sets
or is stabilized by means of heat, chemical ac
tion or otherwise so that it may be left in any
desired ?nal condition, that is to say it will be
?exible or tough or hard. Moreover, the adhe
sive maybe vulcanizable similarly to rubber‘ and
10 the term “rubber” used herein should be un
derstood as including rubber in any suitable
as described above.
I claim:
' \
1. A compound thread formed of elastic rub
ber and coated‘with a protective material to hold
the thread rigid, such protective material being
lacking at predetermined local areas to form‘a 10
2. A compound rubber thread consisting of
form, namely any of those compounds as used
for proo?ng cloth and the like material, any
aqueous dispersion thereof, latex or a natural
rubber threads twisted together and holding ad
or arti?cial compound of rubber and in a‘ con
throughout which comminuted material is sus
centrated or compounded form.
It is to be noted that substances may be used
according to the invention that are usually treat
ditional comminuted material in the interstices,
each rubber thread being provided with a coating 15
3'. A process for coating rubber thread with a
coating throughout which comminuted material -
ed as waste. ' Moreover the subdivided material
is suspended which consists in passing it through 20
may be dyed or capable of absorbing a dye so as
a bath of liquid coating throughout which com
20 to impart to the ?nishedproductamulti-coloured
r speckled appearance and in some cases the
coated ?lament after vulcanization or harden
ing may be so treated with a solvent that small
portions of’ the outer skin of the coating will be
removed or dissolved so as to expose to view the
?nely subdivided material and thus give the
thread a speckled appearance. .
Referring to Figure 3, q shows a bath con
taining a mixture of an aqueous dispersion of
latex, for example, suspended in which is a de
sired quantity of' ?nely divided comminuted
?ock-like or similar material indicated at r.
From the bath q the solution is pumped at s into
a duct t leading to any usual form of extruding
85 nozzle u,' the duct and the nozzle'being sub
merged in a tank 1) containing any suitable liquid
coagulant such as w. The compound-thread
which is extruded by the nozzle vu. will thus be
minuted material is suspended, consolidating the
coating on the thread by rollers, and drying the
liquid on the thread.
4.- A process‘ for forming a compound rubber
thread, which consists in ‘coating rubber threads
as specified in claim 3, with the addition that‘
twisted together before drying.
, the threads are
5. A process for forming a compound rubber
thread, which consists in coating rubber threads
as speci?ed in claim 3, with the addition that
twisted together before drying,
and that comminuted material is added during
- the threads are
the twisting.
' >
6. A process as claimed in claim 3, and re- .
moving the outer skin of the coating at least in
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