Analysis of Temperature Distribution and Thermal Conductivity of Rubber Compound during Compression Molding Process

DOI: 10.14416/


  • Rutchadaporn Sudto Department of Material Engineering, Faculty of Engineering, Kasetsart University
  • Somjate Patcharaphun Department of Material Engineering, Faculty of Engineering, Kasetsart University


Compression molding, Rubber Compound, Temperature distribution, Thermal Conductivity, Filler type and content, Vulcanizing system


Uneven cure of thick-wall rubber products is regarded as one of the most undesirable phenomena since it results in a significant loss of mechanical properties. The primary objective of this study was to investigate the effect of the curing system, filler type, and content on the temperature distribution and thermal conductivity of rubber compounds during the compression molding process. A special compression mold was designed and constructed to measure the temperature distribution across the thickness of rubber parts. The measured results indicated that the efficient vulcanizing system (EV) gave a better temperature distribution across the thickness than conventional vulcanization (CV). Concerning the thermal conductivity of rubber compounds and vulcanizates, it was found that the thermal conductivity increased with the increase of filler content. In addition, the thermal conductivity of cured rubber dramatically decreased as compared to uncured rubber. Furthermore, it should be noted that the decreasing thermal conductivity of rubber compounds, especially for high carbon black loading and thick-wall moldings, directly affected the uneven cure of rubber products. In this work, the step cure was proposed to enhance the temperature distribution across the thickness of rubber compounds. The results obtained in this measurement showed that the step cure could improve the vulcanization efficiency as compared to the conventional method.


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W. Hofmann, Rubber technology handbook, Hanser Publishers, NY, USA, 1989.

S.P. Johnson, Rubber processing and introduction, Hanser Gardner Publications Inc., OH, USA, 2001.

D.M. Park, W.H. Hong, S.G. Kim and H.J. Kim, Heat generation of filled rubber vulcanizates and its relationship with vulcanizate network structures, European Polymer Journal, 2000, 36(11), 2429-2436.

R.L. Fan, Y. Zhang, F. Li, Y.X. Zhang, K. Sun and Y.Z. Fan, Effect of high-temperature curing on the crosslink structures and dynamic mechanical properties of gum and N330-filled natural rubber vulcanizates, Polymer Testing, 2001, 20(8), 925–936.

A. Arrillaga, A.M. Zaldua, R.M. Atxurra, and A.S. Farid, Techniques used for determining cure kinetics of rubber compounds, European Polymer Journal, 2007, 43(11), 4783-4799.

J.E. Mark, B. Erman and F.R. Eirich, Science and technology of rubber, Elsevier, Inc., VT, USA, 2005.

J.G. Sommer, Elastomer molding technology, Bookmasters Inc., OH, USA, 2003.

J.G. Sommer, Materials, process, and design factor” in Troubleshooting rubber problems, Hanser Publications, OH, USA, 2014.

W. Amaro, L. Diviani, D. Montorfano, E. Oberrauch, G. Depinto, S. Segalini, M. Levi and S. Turri, Controlling the shrinkage of polymers for customized shoe sole manufacturing, International Journal of Computer Intergrated Manufacturing, 2004, 17(7), 633-644.

M.H.R. Ghoreshy and G. Naderi, A new method for the determination of the thermal conductivity of rubber compound, Iranian Polymer Journal, 2001, 10(5), 315-320.

M. Rafei, M.H.R. Ghoreshy, and G. Naderi, Development of an advanced computer simulation technique for the modeling of rubber curing process, Computational Materials Science, 2009, 47(2), 539-547.

C.E. Barnett, Thermal properties of rubber compounds, Industrial and Engineering Chemistry, 1934, 26(3), 303-306.

R.J.W. Walker, The effect of crosslink density on the thermal conductivity of rubber, Thesis, University of Lancaster, United Kingdom, 1982.

N.S. Saxena, P. Pradeep, G. Mathew, S. Thomas, M. Gustafsson and S.E. Gustafsson, Thermal conductivity of styrene butadiene rubber compound with natural rubber prophylactics waste as filler, European Polymer Journal, 1999, 35(9), 1687-1693.

N.C. Tham, G. Juttner, C. Loser, T. Pham and M. Gehde, Determination of the heat transfer coefficient from short-shots studies and precise simulation of microinjection molding, Polymer Engineering and Science, 2010, 50(1), 165-173.






บทความวิจัย (Research article)