Rubber Research Institute of Sri Lanka

Ministry of Plantation Industries



Raw Rubber Process Development & Chemical Engineering Department

The main function of the department is to carry out research and development on raw rubber processing for the betterment and sustainability of the industry while protecting the environment.  The department provides advise on trouble shooting, process development and quality improvement in the raw rubber processing industry.  The department is also responsible for assisting the raw rubber industry in human resource development and human safety.

Providing technical know–how and all other assistance in the management of waste water generated in raw rubber processing and rubber product manufacturing industries is also a major function of the department. The qualified, experienced, dedicated and friendly staff who promptly attends to all the services offered by the department is the major asset.

 

Research Officer

Y.C.Y. Sudusinghe, BSc (SL)
yohansudusinghe[at]gmail.com
  1. Developing two technologies to convert NR latex sludge a waste generated in the natural rubber latex centrifuging factories
     
    1. to inorganic functional filler for NR compounds
    2. to a form of crepe rubber
  2. Introduction of water reutilization protocols in processing of crepe rubber from natural rubber latex
  3. Manufacture of low cost low protein contained natural rubber latex and compounded latex with improved shelf-life
  4. Introduction of Solar-Bio mass hybrid dryer at pilot scale for Ribbed Smoked Rubber Drying
  • Development of novel high performance lighter weight prosthetic foot based on hybrid nanomaterial filled natural rubber compound.-U.N Ratnayake,D.G Edirisinghe,Sampath Wikkramasinghe 2013,2015 The project funded by National Science Foundation (NSF) was carried out in collaboration with Army Rehabilitation Center, Ranaviru Sevana    
  • Development of natural rubber latex/layered silicate nano composites-Ananada  Amarasiri,U.N Ratnayake, S. Walpola 2013,2014 Natural rubber latex –clay nano composite was developed with aqueous dispersion of montromorillonite clay as an alternative for conventional NR latex-CaCo3 composite for latex dipped products.
  • A single day smoke drying system for drying sheet rubber –Susantha Siriwardena,2009-2010 It was developed to dry sheet rubber in a single day reducing conventional drying period by 60-80% and saving firewood consumption by 30 % while reducing space requirement by 80% and improving quality of sheets

  • Effluent treatment technology-Gamini Seneviratne, U  N  Ratnayake, Susantha Siriwardane This project has developed and introduced a cost effective effluent treatment system for the treatment of waste water generated from raw rubber processing factories
  • Development of hybrid dryer for drying of natural rubber universal rubber dryer-S.Siriwardena,2010-2013 This project has developed a single drying system for drying of both crepe rubber    and sheet rubber

The department provides testing & troubleshooting services to the stakeholders on raw rubber processing and waste water treatment technology and also conducts tailor made training programs for the managers, field & factory staff to address Metrolac related issues centrifuged latex & dry  rubber manufactures , frying etc.

 

Analytical Services Available

  1. Analytical Service for industrial waste water (industrial effluents):

    Waste water testing laboratory is listed by the Central Environment Authority of Sri Lanka

  2. Analysis of raw rubber, rubber processing water & chemicals for their metal iron concentrations using Atomic absorption spectrophotometer ( AAS)
  3. Analysis of ZnO strength as per the ASTM test method
  4. Processabiliy of raw rubber and rubber compounds: Mooney viscosity and Mooney stress relaxation
  5. Analysis of extractable proteins of rubber: Modified Lowery Method

 

  • A single day smoke drying unit (SS drying unit) was developed for smoke drying of sheet rubber, reducing drying period to one day from 4-5 days and reducing space requirement by 80%. 
  • Smoking at 60 0C is recommended for drying of sheet rubber in a modified drying chamber (SS drying unit) with minimum interruption to achieve complete dryness within a single day
  • Standards for total iron content in processing water used in the manufacture of crepe rubber is proposed to revise as 5 ppm which has been increased from the current level of 1 ppm

Analytical Services Available

  • Analytical Service for industrial waste water (industrial effluents):  Waste water testing laboratory is listed by the Central Environment Authority of Sri Lanka
  • Analysis of raw rubber, rubber processing water & chemicals for their metal iron concentrations using Atomic absorption spectrophotometer ( AAS)
  • Analysis of ZnO strength as per the ASTM test method
  • Processabiliy of raw rubber and rubber compounds: Mooney viscosity and Mooney stress relaxation
  • Analysis of extractable proteins of rubber: Modified Lowery Method

Conducting tailor made training programs for the managers , field staff & factory staff to address metrolac related issues , centrifuged latex & dry rubber manufacture, drying etc. ( Charges : nominal charges depending on the duration of the training session )

Conducting tailor made training programs for the managers , field staff & factory staff to address metrolac related issues , centrifuged latex & dry rubber manufacture, drying etc. ( Charges : nominal charges depending on the duration of the training session )

  1. Sudusingha Y.C.Y., Siriwardena S., Adhikari A.M.K.S.P, Illeperuma R. D., “Study of DMA Properties of Different Types of Natural Rubber Composites”

    Proceedings of “3rd Biennial International Symposium, University of Sri Jayewardenepura Nugegoda, Sri Lanka, 2017

  2. Illeperuma R. D., Sudusingha Y.C.Y., Siriwardena S., “Cure Characteristics and Physico-  Mechanical Properties of Natural Rubber Composi.es Filled with Used Tea Waste”

    Proceedings of “3rd Biennial International Symposium, University of Sri Jayewardenepura  Nugegoda, Sri Lanka,2017

  3. Adhikari A.M.K.S.P, Sudusingha Y.C.Y, “Correlation between Brookfield viscosity and dry rubber content in natural rubber latex; RRISL 121 Clone”

    Proceedings of “3rd Biennial International Symposium, University of Sri Jayewardenepura Nugegoda, Sri Lanka, 2017

  1. U N Ratnayake, D E Prematunga, C Peiris, V Karunaratne, Gihan A J Amaratunga. (2015) “Effect of polyethylene glycol intercalated organoclay on vulcanization characteristics and reinforcement of natural rubber nanocomposites” publish in Journal of Elastomer and Plastics
  2. S. Rathnayake, P. Dharmathilaka, A. K. D. Warnajith and Siriwardena, S., Raw rubber and curing properties of smoked sheet rubber made out of ammonia preserved natural rubber latex , Proceeding of SLCARP international conference, SLCARP, Colombo, 2014
  3.  A  Amarasiri, U N Ratnayake, U K De Silva, S Walpolage, S Siriwardene (2013) “Natural Rubber Latex-Clay Nanocomposite: use of montmorillonite clay as an alternative for conventional CaCO3” Journal of National Science Foundation of Sri Lanka, 41 (4).
  4. Kumarasinghe, L Samaranayake, F Bondino, E Magnano, N Kottegoda, E  Carlino, U N Ratnayake, A Alwis, V Karunaratne, G Amaratunge. (2013)  “Self-Assembled Multilayer Graphene Oxide Membrane and Carbon Nanotubes Synthesized Using a Rare Form of Graphite" Journal of Physical Chemistry C, 117 (18) pp 9507-9507.
  5. S  Siriwardena, A Attanayake, P H Sarath Kumara, N Karunathilake, H V K Gamage, M M A B Munasinghe. (2012). Raw rubber properties of crepe rubber manufactured from preserved natural rubber latex using different combinations of preservatives. Journal of the Rubber Research Institute of Sri Lanka 92, 32-43, 2012 .
  6. M. P. Dhanushika, B. M.S. G. Banneheka, Keminda Herath, and Siriwardena, S. “Use of Statistical software to construct I-MR control charts for non normal data”,  Proceedings of ITRU Research Symposium, 21st November, 2012, University of Moratuwa.     
  7. B. Haworth, U N Ratnayake(2011), “Co-intercalation in PP-clay nanocomposites: Effect of    short chain-additives on rheological properties” International Polymer Processing, XXVI
  8. U N Ratnayake, P H Sarath Kumara, T A S Siriwardena, A K D W Prasad, V C Rohanadeepa (2010) “ Effect of iron in processing water on quality of crepe rubber” Journal of Rubber Research Institute of Sri Lanka, 91, (2011).
  9. S Siriwardena. P H Sarath Kumara, U M S Priyanka (2011), “ The performance of an accelerated drying system for drying of skim natural rubber laces. Journal of the Rubber Research Institute of Sri Lanka 91, 74-86.
  10. U N Ratnayake, “Application of nanotechnology to upgrade Sri Lankan rubber industry” Journal of the National Institute of Plantation Management, 25 (2), (2011).
  11. S. L. S. RasHida, Siriwadena, S. C. Rohanadeepa, A. K. D. Warnajith, and A. Nugawela, “Development of new manufacturing process of crepe rubber for smallholder sector”, Research symposium of Wayaba University 2011     
  12. U N Ratnayake, A K D W Prasad, W D R Wijesinge, “Viscoelastic behaviour and reinforcement of montmorillonite clay filled natural rubber latex nano-crepe rubber” International Rubber Research Development Board (IRRDB) conference – 2014, 21 – 23 November, Manila, Philippines.
  13. U N Ratnayake, G M C Alwis, N Kottegoda, “Vulcanization characteristics and reinforcement of quaternary alkyl ammonium modified clay filled natural rubber nanocomposites” International Rubber Conference (IRC) - 2014, 16 – 18 Sept. Beijing International Convention Centre, China.
  14. G M C Alwis, U N Ratnayake, N Kottegoda, “Effect of nanoclay on reinforcement of natural rubber nanocomposite” Proceedings of the Young Scientist Forum Symposium- 7th Feb 2014, pp 8-11
  15. W D R Wijesinghe and U N Ratnayake, “Value addition to waste acrylonitrile butadiene rubber through nanotechnology applications” Proceedings of the Young Scientist Forum Symposium- 7th Feb 2014, pp 201-2
  16. D.M.M.D. Jayasingha, N.S Withanage, U N Ratnayake “Reinforcing Effect of Organically Modified Montmorillonite Clay in Skim Rubber Nanocomposites” Research Symposium Dec. 12-13, 2013,  UvaWellassa University. "Value Addition Towards Economic Growth & Prosperity”, pp 20-22
  17. A.C.C. Jayasinghe, R.M.S.D. Rathnayaka, U N Ratnayake “Effect of Storage Conditions on Viscoelastic Properties of Crepe Rubber” Research Symposium Dec. 12-13, 2013,  UvaWellassa University. "Value Addition Towards Economic Growth & Prosperity”, pp 16-19
  18. J Ketiperachchi, U N Ratnayake, “NaturalRubber/Clay Nanocomposites: Effect of Organic Modifier of Clay on Cure Characteristics and Mechanical Properties” International Symposium on Polymer Science and Technology 2012, University of Sri Jayewardenepura, Sri Lanka

For Information

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Contact Info

  • Rubber Research Institute of Sri Lanka.
  • Dartonfield, Agalawatta. 12200
  • 034 - 2247426, 034 - 2247383
  • 034 - 2248459, 034 - 3439999
  • 034 - 2247427
  • dirrri@sltnet.lk