The Pacific commercial advertiser. [volume] (Honolulu, Hawaiian Islands) 1885-1921, 1902-01-01

roller mill with rollers 34XIS inches
grinding 1000 tons of cane in "a hours,
this would mean an extraction of 132. rs
tons of sugar going with the juice to
the boiling house, and 1925 tons of
sugar being carried off to the furnaces
with the bagasse. If these 1925 tons of
sugar could be recovered, they would
make about 15.5 tons commercial sugar
for shipment and at $50 a ton, would
represent a daily loss of 1890 AS the
above described work of a single g.
roller mill, under even conditions, lost
Caily s., 100. we have in reality gained
the difference, or 81 10 worth of sugar
per day by the use of the additional
mills.
The capacity of a mill depends main
~ upon the length of its rollers, and
the extraction should be as good in a
small as in a large MILL within reason
able limits, provided the strength of
the construction, shafts, gears etc, will
allow the required pressure to be applied
on the cane. $50 tons pressure for every
foot of roller is the limit observed by
the writer as used on mills regardless
of size. An old fashioned 30X60 mill, con-
Structed like the aforementioned 7-rol-
Ter mill, would grind about 400 tons of
cane in "a hours, producing about 80
tons of sugar in that time. We may
deduce from the above that this mill
would gain 1872 worth of sugar per day
over single 3-roller mill of same size
and grinding the same kind of cane, so
during the grinding of 5000 tons of
sugar crop in 100 grinding days, the
total gain would be $37, 200. But as said
before, this was an extreme test case, 5
and 7-roller 30X60 mills did not usual
ly get such an extraction, and but few
mills ground "A hours every day. Even
by greatly reducing the above total
gain, these rough figures easily bear
out the well established fact that the
cost of the additional mills was nearly
always regained during the first season
by the additional sugar recovered by
them. There was also an enormous
saving in the extra cost for fuel. 1t is
no wonder, therefore, that every Ha-
waiian sugar house was supplied with
additional 2-roller mills during the
years from 1855 to 1893.
The next great epoch in the Hawaii
an mill evolution was inaugurated by
Eva Plantation Co., when in 1894, on
Mr. II. p. Baldwin's recommendation,
they imported the first Stroller mill
from Fulton Iron Works Co, st. Louis.
The principal feature of this milling
plant is three 3-roller mills resting on
One bed and coupled up to one common
gearing, giving each succeeding mill
slightly increased speed over the for
ner mill, and all driven by one engine,
generally of the Corliss type with auto
natic ''cut-off,'' insuring regular speed.
Each mill is fitted with Independent
and adjustable hydraulic pressure on
he top roller, ranging from 800 to 450
ons. The main point which gives this
tNTln Of
'ver the former and roller mills, is G
he absolute uniform relative speed, and l
therefore, feed, of the mills, the most ;
ssential requirement for obtaining the ,
'est possible extraction of juice. If l
rain of mills are coupled to separate
earrings and engines, it is practically ;,
n 1mpossibility to adjust the speeds II
f the mills properly in relation to each
Their. If block of cane occurs in one :
h1ll, the first one for instance, and it
slowed down a moment to let it
Ass, the other mills will meanwhile =
un at their usual speed and a L
bin, uneven feed will be the result I'M II
Il the cane from the first mill reaches l.
he other mills, and not before then u
J good grinding resumed. AS this q
ften happens every day with separate ~
Hills, the good extraction will be badly :,
lterfered with. Coupled to one en- -
inc, the mills will all slow down, and .,
peed up, simultaneously, and the even, -
lanket-like, feed will never be dis ~
lrbed. :"
By Analysing the extraction in each -
Ill and adjusting the hydraulic pres e.
lre and opening between the rollers, ~
ne engineer can readily procure the -
est results from the various kinds of a,
lne delivered to the mills
In all the large new 34X7S Stroller h.
ills, and in number of the 32x6O g. m