Abstract
Present manufacturing methods are characterized by repeatedly plastifying the rubber, partly by mastication and partly by heating. These operations involve the use of heavy machinery, and furthermore in certain cases the rubber mixes are then dissolved in organic solvents, a procedure which has the additional drawback of a more or less considerable loss of organic solvents. The question at once arises: why should these many difficult and expensive steps be necessary in order to prepare a shaped body containing all the compounding and other ingredients from the original latex? There is only one answer to this question, and that is, the actual rubber manufacturer does not start with the liquid sap. Obviously it should be much easier to handle a liquid, to add to it the desired dispersed ingredients, and then to use it in some way or another to obtain the shaped article instead of performing all the masticating operations which are carried out with so much power and such heavy and expensive machinery. But not only is this an economic question. There is more involved. The mastication of the rubber impairs its quality, and the longer the mastication of a certain mix, the poorer the physical properties of the product obtained therefrom will be.

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