The Preparation of Plantation RubberMorgan, Sidney
Science
The Preparation of Plantation Rubber
Morgan, Sidney
Rubber
There have been several schemes put forward for winding crepe rubber on
spindles so as to form a cylindrical package complete in itself. We have
seen the process, and certainly the method had much which appeared
commendable. Apart from other objections which might be raised, there is
always the one prominent objection mentioned in the preceding paragraph.
While baling of rubber is thus not likely to suit the general market, there
is no reason why, as in one or two instances, it should not be practised by
agreement between producer and consumer. It is believed that "slab" rubber
is shipped in bales from Sumatra to the U.S.A.
Quite recently a proposal has been put forward to revert to a simple form
of baling for ordinary plantation rubber. Under this scheme wooden cases
are discarded, the packing material being composed of scrap-grade crepe
rubber which, it is claimed, could be put to use by the manufacturer. An
obvious drawback would be evident if these bales happened to be exposed to
direct sunlight or a continuous high temperature. The tackiness which might
supervene would make the handling of such bales unpleasant, even if it did
not affect the internal rubber.
FOLDING FOR PACKING.--In the packing of smoked sheets it would appear to be
advisable to avoid, if possible, the folding of any pieces, as the
objection is made that such rubber is difficult to "sample" on arrival,
especially in cold weather. Sheets should be prepared or cut to such length
that they occupy the full superficial area of the box, either singly or
side by side.
[Illustration: A SHIPMENT OF RUBBER, PACKED AND READY FOR TRANSPORT.]
The same remark applies to the packing of crepe rubbers, except that here
we deal with units of folded rubber. Crepes are generally folded by hand,
and coolies usually work to a certain dimension by means of a standard
stick. The work is slow, but often gives employment, at a cheap rate of
pay, to women and weak coolies.
Several machines have been invented to replace this labour. The best of
these yet seen has a simple device by means of which the length of the fold
is adjustable to suit the size of any packing case. It is called the
"Senang" folder, and is made by the General Engineering Company (Radcliffe)
Ltd., Radcliffe, near Manchester.
CARE IN ASSEMBLING.--Whatever the type of case employed, great care must be
given to the assembling of parts and the final fastening. It is not
uncommon to find in the operation of putting on the "strapping" that nails
have been driven into the rubber. Extra bands of strapping are sometimes
advised, and where these bands pass over the sides (not edges) of the case
only specially short nails should be used.
All wood should be planed, and in cases other than three-ply should be of
stout wood, not less than 5/8 inch in thickness. All timber used should be
of uniform type and thickness.
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