The Preparation of Plantation RubberMorgan, Sidney
Science
The Preparation of Plantation Rubber
Morgan, Sidney
Rubber
CHOICE OF CASES.--Consumers complain justly of the presence of chips,
splinters, and wood-dust. It will be evident, therefore, that whatever the
type of case employed the interior surfaces should be smooth, there should
be no cracks or gaps in the timber, and the cases should be cleaned out
before using. There remains great room for improvement in the means and
method of packing, and in spite of suggested alternatives we are at present
restricted to the use of wooden cases.
From comparisons of actual quality and fulfilment of the requirements
indicated above, there can be no question that cases made of three-ply
wood, such as the "Venesta," are in every respect superior to the ordinary
wooden cases of "Momi" type. The consideration of cost and available
supplies, of course, enters largely into the question, and three-ply cases
are not at present so largely employed as they deserve to be.
A new type of case was recently exhibited in Singapore. It emanates from
the U.S.A. and is made of a fibrous material, resembling in appearance a
very stout cardboard. The complete case when assembled consists really of
two boxes, one of which is inverted and slides down over the other. Packing
is completed by means of stout wire, which is strained by a simple ratchet
arrangement. It is claimed that from 225 to 250 lbs. of rubber can be
contained. Other claims made amount to the statement that the case is
practically indestructible under normal conditions of handling and
shipping. A demonstration given certainly appeared to substantiate the
statement fully. Rubber packed in cases of various and average type was
allowed to fall from a height of about twenty feet. In all instances the
wooden cases of every type were either smashed or badly burst, whereas the
fibre cases were merely dented. These cases are obtained in flat sections,
which, in assembling, are folded and clamped by means of copper rivets in
a special but simple machine. It was pointed out that objection might be
lodged against the use of copper for this purpose.
More recently there is announced a new packing case which is stated to be
made from low-grade rubbers, but information is rather vague.
BAGS.--There are in local use stout canvas bags which have the advantage of
being used many times, as long as they are waterproof and kept in good dry
condition. Their employment for the conveyance of smoked-sheets would
appear to be permitted, but crepe rubbers sent in them are often reported
upon as being "massed" at the edges, and hence difficult to "sample."
BALES.--Attempts to bale rubber for the market have been frequent, but no
success seems to have attended the efforts. In some quarters the failure
has been ascribed to prejudice on the part of buyers, but it is the opinion
of the writers that the objections to baling are, or could be,
well-founded. Massed rubber often cannot be inspected properly, and hence
is always open to suspicion that internally there may be unsuitable
portions.
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