Cheraw gazette. [volume] (Cheraw, S.C.) 1835-1838, 1837-03-28

inder, this pressure will be transmitted to
the fluid of the larger, increased in propor-
ton to the volume of the two cylinders.
Thus, fthe contents Of the larger cylinder
is one hundred times that of the small, the
pressure on the surface Of the first will
be one hundred times that which was ex-
erted on the other. This being we'll under
stood, it is easy to calculale the action OF a
hydraulic press.-If the two cylinders be-
ing full, new quantity Of water is made to
enter by means of a small forcing pump put
in play by the same lever which gives the
pressure to the small piston, this WATER
pressing from all sides, will raise the move
able stopper in the large cylinder which ral-
ses to the upper part of the plate OF the
the press.
This kind of press, which offers great
advantages, has been adopted IN all the fac.
tories where considerable pressure is re-
qured.
Whatever press, in fine, any one has at
its disposal, one of the most important points
is, that it work quick, and that the interval
between the rasping and the pressure should
be the shortest possible, so that the juice
should not undergo any change.
The pulp, in order to be passed through
the press, is enclosediin bags of strong cloth,
but not too close for the liquid to escape
easily. for if it should not escape, the bags
would break under the pressure. The dI,
mcnsions ofthese bags is to be determined
by that of the press, leaving an excess OF
length sufficient for the fold that is to form
the bag. The quantity Of pulp put into
each bag should be such as to form. when
spread, bed not exceeding an inch and a
half or two inches thick. For this, work
man after having put the pulp in the bag,
bears it on hurdle ofoziers placed on a tray,
there, with his hands he spreads this pulp
in bed in the inside Of the bag, the end of
which open below, he fills with it.-He pla.
ccs hurdle on it, and above second bag
which he disposes like the preceding. When
he has thus formed a pile of ten bags, a
second workman raises it, and places it on
the plate of the press. When the press has
received its quota of twenty or thirty bags,
varying according to its height, it is put in
play.
We give to the whole ofthe bags which
are put to the press, and which should be
the same at each time, the name ola set Of
bags. Thus there are many sets, and some
bags for changes, in cases Of accident.
While one set is in the press, the work
men prepare another, in order that there
may be no interruption in the labor. The
tray on which they are arraigned is design
ed to receive the juice that flows from the
pulp when it is spre ID in bed on the bags.
The hurdles rest on two traverses Of wood
placed parallel on the length of the tray,
in the direction of It's breadth.
Blythe effect ofthe pressure, the juice run
ming out of all parts, falls on the plate, and
thence is conducted by gutter into reser-
voir of wood lined with copper. AS it is
necessary that the pressure should be made
gradually, a single workman at first works
the press, i second. third, and so on, coming
successfully TO join him, to produce the
greatest pressure. Then they leave the
press, which, after remaining quarter Of
an hour, is looscd, the bags taken out, and
carried to the place destined to receive the
pulp, where they are emptied, turned and
beaten, in order to detach the matter ad-
herring 10 them.
The bags and the hurdles should be wash.
ed at least every twelve hours with boiling
water, to which should be added u little salt
of soda. 1t should be the same also with
the trays, the plates ofthe press, and gener-
ally all the utensils used in the operations
above described. The washing of these
should be done with cold lime water.-ln
some factories where the screw press is
used, they are accustomed to slack the
press, to put the bags below, to remove the
pulp, and then to subject it to a second pres.
sure. This is intended to supply the defect
of power, which cannot be otherwise obtain.
ed by these presses.
With hydraulic press, capable of re-
ceiving each time thirty bags oftwenty.two
inches long, and fifteen broad, filled each
with an inch and half thick, the whole
weight being about 800 pounds, may be
made in twelve hours, ten or twelve pres
sings, which at the rate Of 10 parts ofiuice
for 100 of pulp, will produce from $500 to
$4,000 litres* of juice.
INSUBoRDINATIoN-BAD Company.