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Additional resources for Aircraft Profile No. 35: The Curtiss P-40 Tomahawk

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The smoke simultaneously dries and preserves the sheets, so that the rubber does not become mouldy. Today smoking in smokehouses has been replaced by smok­ ing in tunnel driers. Preservation by smoking is necessary because in this method of processing the serum is not completely eliminated. The coagulation of latex in tanks divided by partitions causes various irregu­ larities in individual sheets. Therefore, attempts have been m a d e to substitute the batch precipitation by a continuous precipitation process.

During this operation the colouring components pass into the first fractions, representing a b o u t 15%, which are sold under the n a m e yellow crepe. The production of crepe is m o r e expensive and is produced in limited a m o u n t s only; the major part of the latex is processed to produce smoked sheets. Smoked sheets In the processing of coagulated blocks to give ribbed smoked sheets (RSS), the blocks also pass through a battery of two-roll mills under constant washing with a water shower, b u t the rolls are smooth and rotate at the same rate, so that the material is only squeezed out and thinned.

Little is known a b o u t the composition of nitrogen-containing substances. 25 is not completely substantiated and the true content of rubber hydrocarbon can differ by 1 — 2%. The relatively considerable variations in the contents of individual components is due to climatic and biological effects, differences in processing, etc. Humidity The water content in rubber depends on temperature and atmospheric humidity, and also partly on the composition of the rubber. With increasing air humidity the humidity of rubber also increases, and as air humidity in tropical regions is generally much higher than in the regions where the rubber is used, small losses of weight of rubber usually occur.

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