Abstract

Abstract Temperature lag in the heating of rubber articles is found to cause marked non-uniformity of cure in the product. The theory of “unsteady state” heat flow is discussed, and a method described for analyzing data on temperatures in rubber being heated. From data on the temperatures at different times during the heating process and on the relation between the rate of cure and the temperature, it is shown how the resulting curing effect at different points in a solid rubber object may be calculated. A new water cure process for tires is described which is very effective in reducing the non-uniformity of cure caused by the temperature lag effect, and at the same time appreciably reduces the necessary curing time.

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