Harrisburg telegraph. [volume] (Harrisburg, Pa.) 1879-1948, 1914-01-17
THE NEW METHOD
OF TIRE BUILDING.
Complete New Machinery and
Manufacturing Processes
Are Utilized
RY FRANK g. .MILLHoFF

b1 cfSAINh ".
Sales Manager. The Miller Rubber co.
Ask ten automobile owners what is
the greatest single item of motoring
upkeep and nine will reply, Tire ex-
pense." Ask another ten about the
annoyances and nine will shout at
you, Tire trouble"
With this feeling toward tires
made under the old methods, 1t Will
easily be understood why the Miller
organization was not content TO iol-
low either the Full mold unit con-
struction" or the "two cure wrapped
tread" methods then in vogue. when
they determined eight years ago TO
add tire building to their established
lines.
The Miller One-cure Wrapped-tread
method of tire building is result OF
our % years experience in making
wear-resisting rubber, and several
years additional labor and expense In
designing and perfecting the special
machinery required.
The tremendously increased de-
mand for tires during the past rev
years has given tire makers In gen.
eral but little opportunity to perrec'
new methods, nor in fact do anything
else than endeavor to meet the de-
mand with such tires as they could
readily get the machinery TO make.
The Miller organization, on the CON
trary, has anticipated the demand ior
a new standard in tire service by de-
vising this new method ana ASKING
special machinery for it.
Built Up by Machinery
Under this new process the carcass
is built by stretching the required
number of layers one over another
upon a mold core of the same shape
as the desired tire. The fabric has
previously been cut in one long
strip of the required width, coated
with raw rubber in order that the
successive layers will adhere to each
other when stretched into place over
the core.
In this way, the Miller process
avoids three of the fertile causes or
tire trouble: Firstly. the fabric Is ap-
piled to the core at an even pressure
Instead of being jerked over 1t by
hand, leaving loose places. Secondly
there is no possibility of perspiration
or foreign material getting in be-
tween the layers from the hands or
knees OF the operator to cause trou-
BILE later on as when the tire is built
by hand. Thirdly, there are no Jumps
or seams in the carcass where the IN
dividual strips OF fabric overlap as In
other tires. These machines do tneir
work with precision and every ure
Is built up to a standard of 100 per
cent.
Vulcanized in Live Steam
After the tire is completely built
upon the core, light rings are placed
upon each side of the completed tire.
These rings conform exactly to the
bead of the tire and extend nearly up
to the tread. AS these rings are
drawn together by pressure, the fab-
ric is drawn tight from the apex OF
the tire toward the bead. This makes
buckling or pinching of the fanric
an impossibility. Unlike tull moio
tires there are no molds to warp or
press the layers of fabric and rubber
out of shape, and cause blowouts and
ruptures in the completed tire.
Two-cure wrapped tread tires are
made by partially curing the carcass,
then adding on the tread and giving
the combination a second curing. The
One-cure Miller method makes uneven
curing and separation of tread parcti-
cally impossible.
Every batch of Miller tires that
goes into the huge steam Vulcanlzers
is accompanied by an eight inch test
section of tire which is used as
guide to insure accurate vulcaniza-
ton. And the batch of tires is not
pronounced cured until this test sec
ton is correctly vulcanized through
out. After that every tire is tested by
the Miller plastometer. delicate IN
strument which registers the precise
toughness and elasticity of the rub
ber.
These new methods of tire building
add considerably to the expense OF
manufacture, but they enable us 10
do all our own experimenting in our
own factory at our own expense. In
a word, to keep the flaws out and
build extra mileage in so that the
buver of Miller tires may be assured
of as nearly perfect tire service as 1t
is possible to furnish. The public
have been quick to appreciate this
new standard in tires for the sale Oh
Miller tires has tripled the past year.