BATCH DRYING OF UNSMOKED SHEET RUBBER UNDER VARIOUS DRYING STRATEGIES AND QUALITY APPROACH
Rubber (Hevea brasiliensis) is the most important commercial natural source in ASEAN countries.Mostly natural rubber industries were followed by old traditional method.However, understanding in the rubber drying process occurred.Then, this research aims to verify model for describing equilibrium moisture content of fresh rubber sheet and to study effect drying conditions on kinetics and quality of unsmoked sheet rubber.The results showed that equilibrium moisture content decreased with increasing temperature at constant relative humidity.The Modified Halsey model was found to be the most suitable for describing the relationship among equilibrium moisture content, relative humidity and temperature.The five different drying strategies were carried on by green house drying, green house and natural convention drying, open sun and natural convention drying, infrared drying and hot air drying.Initial moisture content of fresh rubber sheet was varied between 30 and 50％ dry-basis and dried samples had final moisture content of 1±0.5％ dry-basis.From the experiments, it was found that falling drying rate stages and mathematical models of Approximation of diffusion model can predict the behavior of unsmoked sheet rubber was good.For evaluating the effective diffusion coefficient by Fick’s law of diffusion was found that the effective diffusion coefficient increased with temperature.Unsmoked sheet rubber was dried by green house and natural convention drying longer period than those of open sun and natural convention drying, green house drying, hot air drying and infrared drying, respectively.Additionally, drying at a low drying temperature has a low specific energy consumption compared to those drying of high temperature.To determine qualities following the highest standard Thai rubber (STR5L) grade, the results showed that quality of samples was acceptable in market level.
EMC unsmoked sheet rubber green house drying quality
Waiyarat Suchonpanit Supawan Tirawanichakul Yutthana Tirawanichakul
Department of Chemical Engineering,Faculty of Engineering,Prince of Songkla University,Hat Yai,Songk Plasma and Energy Technology Research Laboratory,Department of Physics,Faculty of Science,Prince of
国际会议
The 7th Asia-Pacific Drying Conference(第七届亚太地区干燥会议 ADC2011)
天津
英文
1-10
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）