Indiarubber And Gutta Percha a Complete Practical Treatise On Indiarubber And G
Indiarubber And Gutta Percha a Complete Practical Treatise On Indiarubber And G
Th Seeligmann
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Six-roll double-effect calender. TRANSFORMATION OF NORMAL RUBBER 157 nervous, cold rubber. The speed of the rolls is 10 to 30 revolutions a minute. The horse-power averages 10, but may suddenly reach 20. Large-sized calenders revolve at about 5 centimetres per second, the force absorbed varies from 15 to 25- horse-power. When the number of rolls is four or five, their temperature is brought to 60 to 75 C. From three to four persons are required to attend to a calender, feed the rubber, adjust t...he rolls, regulate the distance between the knives, gauge the thickness of the sheet, roll it up, receive it, drive the motor, and attend to the clutches. These machines are generally driven by a special adjacent steam engine, an engine with two oblique cylinders with steam of 6 kilogrammes per sq. Cm. Six-roll calender vnth double effect. This machine, of more recent invention, FIG. 65. Six-roll double-effect calender. is constructed by the Birmingham Iron Foundry, U. S. A. Figs. 61, 64, and 65 repre- sent this powerful machine in three different positions.
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