Electrical requirements of certain machines in the rubber industry

The paper outlines the principal operations carried on in a rubber factory and gives some figures on the corresponding power requirements. The crude rubber as it comes from the forest or plantation must be cleaned, thoroughly kneaded, and mixed with various ingredients to form the final compound. Rubber has a great capacity for absorption of power and is materially benefited thereby. Electrical power can be advantageously used in the working up of rubber, particularly in rolling the compound into sheets, where adjustable speed operation is productive of economies. The author concludes with a comparison of methods for obtaining adjustable speed operation and points out the desirable features which should be embodied in the control.