Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31824
Mathematical Model of Smoking Time Temperature Effect on Ribbed Smoked Sheets Quality

Authors: Rifah Ediati, Jajang


The quality of Ribbed Smoked Sheets (RSS) primarily based on color, dryness, and the presence or absence of fungus and bubbles. This quality is strongly influenced by the drying and fumigation process namely smoking process. Smoking that is held in high temperature long time will result scorched dark brown sheets, whereas if the temperature is too low or slow drying rate would resulted in less mature sheets and growth of fungus. Therefore need to find the time and temperature for optimum quality of sheets. Enhance, unmonitored heat and mass transfer during smoking process lead to high losses of energy balance. This research aims to generate simple empirical mathematical model describing the effect of smoking time and temperature to RSS quality of color, water content, fungus and bubbles. The second goal of study was to analyze energy balance during smoking process. Experimental study was conducted by measuring temperature, residence time and quality parameters of 16 sheets sample in smoking rooms. Data for energy consumption balance such as mass of fuel wood, mass of sheets being smoked, construction temperature, ambient temperature and relative humidity were taken directly along the smoking process. It was found that mathematical model correlating smoking temperature and time with color is Color = -169 - 0.184 T4 - 0.193 T3 - 0.160 0.405 T1 + T2 + 0.388 t1 +3.11 t2 + 3.92t3 + 0.215 t4 with R square 50.8% and with moisture is Moisture = -1.40-0.00123 T4 + 0.00032 T3 + 0.00260 T2 - 0.00292 T1 - 0.0105 t1 + 0.0290 t2 + 0.0452 t3 + 0.00061 t4 with R square of 49.9%. Smoking room energy analysis found useful energy was 27.8%. The energy stored in the material construction 7.3%. Lost of energy in conversion of wood combustion, ventilation and others were 16.6%. The energy flowed out through the contact of material construction with the ambient air was found to be the highest contribution to energy losses, it reached 48.3%.

Keywords: RSS quality, temperature, time, smoking room, energy

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2483


[1] Statistics Indonesia. 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007. Foreign Trade Statistics. Export Table, According Month and Year. (Accessed on March 20th 2009).
[2] E. Ritonga, Vietnam Diminta Ikut Kendalikan Harga Karet. th
[3] The Green Book. 1968, 1969, 1979. Lemar International. International Standards of Quality and Packing for Natural Rubber Grades. (Accessed March 17, 2009).
[4] Tonisah. Energy Usage of Rubber Production of PTP Nusantara IX (Persero) Krumput Banyumas. Internship Report. Agriculture Faculty of University of Jenderal Soedirman. 2007
[5] M. Promtong, P. Tekasakul. CFD Study of Flow in Natural Rubber Smoking Room: I. Validation with The Present Smoking Room. Applied Thermal Engineering 27, 2007, pp 2113-2121.
[6] National Standardization Board (BSN). 1999. SNI National Standards Indonesia. SNI 06-1903-2000. Standard Indonesian Rubber (SIR).
[7] S. Prasertsan, P. Kirirat, S. Sen-Ngam, G. Prateepchaikul. Monitoring of The Rubber Smoking Process. Prince of Songkhla University Hat Yai, Thailand. 2004.