The Preparation of Plantation Rubber

Renew：Part 35
Author：Sidney Morgan
Update：08-15-2023
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Chapter List

Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter VI. on the conditions under which latex is transported, it follows that nothing but the very best and most suitable vessels should be used in the store. A point to which adequate attention is not given in many factories might be mentioned here. Considering the importance attached to colour in the dry rubber by brokers and consumers, and knowing how extremely trivial are the causes which may mar the colour, it is rather surprising that better provision is not made for the reception and handling of latex in factories. Too often the receiving vessels are placed on the floor of the store close to the entrance. Coolies bringing in latex cannot avoid bringing with them quite a considerable amount of dirt. Presuming that a hose-pipe has been installed, and that the floor is constantly being sluiced down with water, no great harm will result. But would it not be ever so much better if the dirt were kept out? In how many factories is provision made for this? Such an arrangement is not difficult to make, and is already in practice on a few estates. A verandah is built outside the wall of the factory and all latex is received there. In another place open chutes are provided which terminate in the straining sieves. The coolie thus stands on the verandah where he removes coagulated lump and impurities from the latex, which is then poured down the chute, pa.s.sing through the sieve into large coagulating jars or tanks.
Chapter 7
Chapter VII. It used to be the general custom to mix the acid and latex in each individual dish, and in some small or non-progressive factories that is still the procedure.
Chapter VII.) to familiarise the reader with the use of this term for the description of latex diluted daily to a level of dry rubber content. Whatever may be the practice elsewhere, it is now fairly general on estates in Malaya to reduce all latices to a uniform "strength" for the preparation of sheet rubber. It is claimed that only in this manner can uniformity of product be achieved.
Chapter XI.
Chapter VIII., and is applicable to latex standardised to 1-1/2 lbs. dry rubber per gallon. If a higher standard is chosen the quant.i.ty calculated as in (_b_) of that formula may be increased slightly, and the exact requirements found by experience. The caution must again be given that the employment of an excess of sodium bisulphite will lead to the production of an over-pale rubber, and a prolongation of the drying period. If thick crepes are made, an excess of the chemical is sometimes made visible by a greyish powder deposited on the edges of the strips of dry rubber.
Chapter 12
Chapter 13
Chapter IX. It is sufficient only to allow adequate time for furnace water to drip from the sheets before transferring them to the smoke-house. As it is the general rule to roll sheet rubber in the morning, this arrangement fits in very well. The furnaces of the smoke-house are usually extinguished as soon as the sun is well risen, and the rest of the day is occupied in sorting dry sheets, etc. Towards noon the day"s wet sheets should have been admitted, and smoking may be commenced as soon as the sun is well in the west--say, at half-past four o"clock or earlier.
Chapter IX.), not the slightest ill-effect is found to result from the short interval of preliminary drying or dripping practised on many estates preparatory to smoke-curing.
Chapter 16
Chapter IX.
Chapter 18
Chapter 19
Chapter 20
Chapter 21
Chapter XIII., and is here only mentioned with the view of emphasising the point that no estate can be blamed for a lack of "finish" in crepe rubbers if the equipment of machinery is inadequate or in poor condition.
Chapter 23
Chapter 24
Chapter 25
Chapter 26
Chapter 27
Chapter V.
Chapter 29
Chapter 30
Chapter 31
Chapter 32
Chapter 33
Chapter 34
Chapter 35