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Due to improper design of the original rubber smoking-room, Ribbed Rubber Smoked Sheets (RSS) productions at Thai Rubber Smoking Cooperatives (RSCs) are undergoing. In this research, a prototype of the two-stage forced convection system has been proposed to renovate the traditional smoking process. Generally speaking, to enhance the efficiency of fuel consumption and to increase the number of qualitative RSS, the new hot-gas supplying system was carefully designed and constructed. Eight small ventilating lids were specifically used at the smoking-room ceiling to improve the velocity and temperature distributions. To obtain the optimal temperature (60°C) for natural rubber smoking, the feeding rates of firewood and the supplying rates of hot gas while operating this new forced convection system were optimized. According to the RSS production (1458 sheets), the drying time and the fuel consumption were found at 90 hrs., and 1.04 ton per a ton of the dried sheets, respectively. Surprisingly, 92% (822 kg) of the dried RSS were found to be above the selling grades; nevertheless, the remaining was in the cutting-grade due to having the unacceptable thickness (> 3mm). Overall, the new two-stage forced convection system could save 25% of production time and 35% of fuel consumption compared with the original natural convection system. Because the harmful aerosol particles could be trapped, so this new forced convection system may be friendly to the environment as well. In future work, a Computational Fluid Dynamics (CFD) technique will be used to enhance the efficiency of this new smoking-room system for RSS production.

TWO-STAGE FORCED CONVECTION FURNACE FOR RIBBED RUBBER SMOKED SHEET (RSS) PRODUCTION: PERFORMANCE EVALUATION