By Jean-Maurice Vergnaud, Iosif-Daniel Rosca
Featuring the paintings one of many world’s top-rated experts on rubber curing, this uniquely finished source presents precious facts that might enable researchers and engineers to discover recommendations to their very own curing problems. It delves right into a number of present review practices for unvulcanized and vulcanized rubber and curing equipment, together with using molds and injection molding. It additionally explores a few suggestions to on-going demanding situations with recycling scrap rubber. In all circumstances, theoretical remedies are provided in a didactic demeanour, in order that readers now not absolutely acquainted with the phrases can, however, simply comprehend the advancements during this field.
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Extra info for Rubber Curing and Properties
26) Of course, in this case, it is implied that when the surface of the rubber is heated, the mold surface is somewhat cooled, at least over a given time which depends on the reactivity of the heating system of the mold. 4 Heat Transfer between a Solid and a Fluid When a fluid (liquid or gas) of large volume at temperature Test is in contact with the solid (rubber or mold), the heat transfer is achieved by convection in the fluid. The convection is forced when the fluid is stirred, and it is natural or free when the fluid is motionless.
M. 6 Extent of reaction as a function of time at the mid-plane of sheets of various thicknesses. Temperature of 180°C and 2% sulfur. (With permission from Rubber Chemistry and Technology, copyright 1983, 56, 689, Figure 6. Calculation of the temperature and extent of reaction during the vulcanization of powdered rubber. A. Accetta and J. M. ) v. 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.
2 Boundary Conditions Various surface conditions may arise, depending on the nature of the atmosphere surrounding the heated material, rubber, or mold. 1 No Heat Flux at the Surface This case is very extreme from a practical point of view, as perfect insulators do not exist. Nevertheless, from a theoretical point of view, the problem can be considered as it leads generally to easier solutions. 2 Constant Temperature at the Surface This is the other extreme case, after the previous one obtained without heat transfer.
Rubber Curing and Properties by Jean-Maurice Vergnaud, Iosif-Daniel Rosca