By Jean-Maurice Vergnaud, Iosif-Daniel Rosca
Featuring the paintings one of many world’s superior gurus on rubber curing, this uniquely complete source presents worthy info that would let researchers and engineers to discover suggestions to their very own curing problems. It delves right into a number of present evaluate practices for unvulcanized and vulcanized rubber and curing tools, together with using molds and injection molding. It additionally explores a few suggestions to on-going demanding situations with recycling scrap rubber. In all situations, theoretical remedies are provided in a didactic demeanour, in order that readers no longer absolutely accustomed to the phrases can, however, simply comprehend the advancements during this field.
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Additional resources for Rubber Curing and Properties
Iii. Results of interest can be obtained by calculation, either for the profiles of temperature or, much better, for the state of cure. iv. 6. 1. In fact, as shown in this figure, it takes some time for the heat transfer to be achieved through the thickness of the rubber sheets. The obvious statement holds: the thicker the rubber sheet, the longer the sheet needs to be completely heated and cured. 5 Temperature profiles developed through the thickness of rubber sheet cured at 180°C with 2% sulfur.
It should be said that the state of cure at time t is expressed in this paper by the heat evolved at time t from the cure reaction as a fraction of the total heat evolved. vi. The mathematical analysis is correct but the numerical treatment is poor, based on an explicit method with finite differences. The assumption used for the heat transfer at the rubber–mold interface is better than taking an infinite heat transfer at this interface, which leads to the fact that the temperature on the surface of the rubber reaches instantaneously that of the mold surface.
And generally, people working on a rubber compound have to determine themselves the thermal properties of their material. Nevertheless, in our calculations for the profiles of temperature or of state of cure developed through the thickness of the sample during the cure, the values taken for these thermal properties will be given beforehand. 6 HEATING OR COOLING STAGES WITHOUT CURE REACTION The cooling period is of practical importance for the vulcanized compound, when this material has been extracted from the mold and let cool in the surrounding atmosphere.