The Preparation of Plantation RubberMorgan, Sidney
Science
The Preparation of Plantation Rubber
Morgan, Sidney
Rubber
METHODS OF PACKING.--The usual method of packing crepe is to fold the
lengths to some measure of the dimensions of the case. This is done in a
haphazard fashion on some estates, with the result that either space is
lost or the packing is badly arranged.
Some ingenuity can be displayed in the packing of sheet rubber in order to
avoid folding the sheets, which, besides increasing the difficulty of
sampling, leads to loss of space. Endeavours are being continually made on
estates to prepare sheet of such a size as to obtain the maximum benefit of
space both in smoke-house accommodation and in packing. A few estates
employ tanks of such calculated dimensions as will yield uniform sheets
which pack flat and fill the superficial area of the case.
In view of the contamination which sometimes characterises the employment
of wooden cases it is sometimes advised that the interior should be lined
with sheets, or pieces of crepe, the ends of which are later folded over
the top of the mass. In this manner it is stated that contamination is
confined only to the exterior of the contents of the case.
WEIGHT OF CONTENTS.--The dimensions of average cases are 19 inches by 19
inches by 24 inches, giving a capacity of 5 cubic feet.
In these it is possible to pack 150 lbs. of crepe rubber and 200 lbs. of
sheet rubber (about 5 per cent. more in cases of three-ply wood). It may
be noted that boxes arrive in better condition when fully packed. The
foregoing figures are not adhered to strictly. For example, some estates
find it expedient to ship rubber in actual ton lots, and for this purpose
pack only 140 lbs. of crepe per case, giving sixteen cases to the ton.
Other estates, using presses, pack more per case than the quantities noted
above. At present there does not appear to be any definite regularity in
practice.
[Illustration: ON ITS ROAD TO THE RAILWAY: BULLOCK-CART TRANSPORT.]
In all instances it should be the invariable rule that the rubber should be
weighed before packing, and that all cases should contain uniform nett
quantities of any particular type of rubber. Invoicing, etc., will thus be
greatly facilitated. If these practices are followed, and the rubber always
weighed on the same scales (assuming it to be perfectly dry when packed)
complaints of "short-weight" should be infrequent.
"SHORT" WEIGHTS.--In some cases the occurrence of "short" weights on
arrival at ports would appear to be inexplicable. It often happens that the
constituent parts of wooden cases have been in stock for a considerable
period. If for no other reason than that indicated below, all cases,
either before or after assembling, should be thoroughly dried in the sun.
"Short" weight could be accounted for to some degree by a lack of
observance of this elementary rule, as it is most probable that there would
be a perceptible difference in weight of the wooden case in a drier
atmosphere.
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