Sungai Buloh, Malaysia
Sungai Buloh, Malaysia

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Ng C.S.,JPS Partners | Lim H.M.,Malaysian Rubber Board | Hashim M.Y.A.,Malaysian Rubber Board
Journal of Rubber Research | Year: 2016

See Toh's report on 'Statistical Designed Experiments in Rubber Compounding' filled the gap in the literature on this technique, detailing specific experimental work on full factorial design, fractional factorial design, and rotatable central composite design for rubber product manufacturing. In the latex technology area, Ng, et al.2 gives specific details on the use of design of experiment (DOX) in latex compounding. Despite these authors' efforts in promoting the use of DOX adoption of their techniques has not been encouraging. To bridge the gap between theory and practice, the authors described the detailed steps in DOX practice, and describe how R statistical computing language and environment allow wider adoption by practitioners. Emphasis has been placed on graphical presentation and wider scope involving equipment, latex types, and compounding ingredients.


Yau Y.H.,University of Malaya | Wong H.F.,Malaysian Rubber Board | Ahmad N.,Malaysian Rubber Board
International Journal of Heat and Mass Transfer | Year: 2012

The physical processes of heat transfer are typically complicated in the curing of rubber. In this study, the image plot and the plot of the temperature profile were obtained in such an environment, and then compared with the finite element method (FEM), which is used in finite element analysis (FEA) software. A good agreement was observed, and the difference was less than 1% when evaluating the different curing conditions. This confirms that the correct curing time can be determined by studying the temperature profile, which will help to avoid the deterioration of the mechanical properties of thick rubber products. © 2012 Elsevier Ltd. All rights reserved.


Lim H.M.,Malaysian Rubber Board | Misni M.,University of Kuala Lumpur
Applied Rheology | Year: 2016

Natural rubber latex concentrate (NRLC) is an important material used in manufacturing dipped products, yet thorough analysis of their colloidal and rheological properties are still lacking in these areas. In this work, the colloidal and rheological behaviour of the NRLC was studied. The NRLC particle size was in the range of 0.3 to 2 m with narrow particle size distribution. The response of NRLC to an applied deformation was assessed through rheological experiments which include dynamic oscillation and steady state measurements. A change from liquid-like to solid-like behavior was observed as the volume fraction of the NRLC was increased above 0.48. The plastic viscosity and yield stress of the NRLC increased with increasing volume fraction according to the Bingham equation. The maximum packing volume fraction of the NRLC was found to be 0.75 with a diffused double layer thickness of 14 nm at φ=0.61. © Appl. Rheol.


Maarof F.,Technical University of Madrid | Fauzi M.A.F.A.,Malaysian Rubber Board | Mohamed S.,Technical University of Madrid
AIP Conference Proceedings | Year: 2014

This paper presents results on statistical distribution fitting and polynomial regression on accumulated biomass of seven year-old tree species Hopea odorata, which were planted in three different soil series of ultisols, namely Rengggam, Baling and Kuala Berang. Data were collected from a study conducted in a Hopea odorata plantation at FRIM Research Station, Segamat, Johor. Thirty tree stands in each soil series were randomly sampled to measure their growth performance and accumulated biomass. The Kolmogorov-Smirnov and Anderson-Darling tests indicated that for all tree stands, diameter, height, above ground (stem, branch, leaves) and below ground (root) biomass were found to be best fitted with the four parameters Johnson's System Bounded (SB) distributions. Then, for each soil series, a polynomial regression model was estimated to describe the relationship between total accumulated biomass and functions of tree diameter and height. © 2014 AIP Publishing LLC.


Hazir M.H.M.,Malaysian Rubber Board | Muda T.M.T.,Malaysian Rubber Board
IOP Conference Series: Earth and Environmental Science | Year: 2016

The Malaysian rubber industry, especially in the upstream sector, is much dependent on smallholders to produce latex or cup lumps. Identification and monitoring of rubber smallholders are essential tasks when it comes to the Malaysian rubber industry's sustainability. The authorised agencies who support the rubber smallholders can do better planning, arranging, and managing. This paper introduces a method of calculating the total number of smallholders as well as identifying the location of their planted rubber area. The scope of this study only focused on land owners as rubber smallholders in the selected study area of Negeri Sembilan. The land use map provided by the Department of Agriculture Malaysia gave information on distribution of rubber area in Malaysia, while the cadastral map from the Department of Survey and Mapping Malaysia was specifically used for identifying land owners of each rubber parcel or rubber lot. Both data were analyzed and processed with ArcGIS software to extract the information, and the results were then compared to the Malaysian Rubber Board smallholders database.


Abdullah N.,Malaysian Rubber Board | Mustafa A.,Malaysian Rubber Board | Lang M.K.,Malaysian Rubber Board
Malaysian Journal of Analytical Sciences | Year: 2016

This paper describes the effect of protein denaturants namely, urea and sodium dodecyl sulphate (SDS) in the deproteinisation of high ammonia natural rubber latex (HA-NRL). It had been shown that latex proteins were reduced more in the presence of urea alone (48%) than in the presence of SDS (18%). The synergistic effect when both urea and SDS were used in the latex deproteinisation attributed to the higher protein removal efficacy (55%). Higher zeta potential value was observed when only SDS was used, suggesting higher colloidal stability. Environmental Scanning Electron Microscopy (ESEM) revealed that without SDS, the use of urea single-handedly in the deproteinisation process promoted aggregation of latex particles, possibly due to the dismissal of latex proteins which helped to stabilise latex colloidal. Thus, it is most likely that urea serves as a protein unfolding agent during latex deproteinisation process, while SDS functions as a latex stabiliser with no significant effects on latex proteins discharge. © 2016, Malaysian Society of Analytical Sciences. All rights reserved.


Razar R.M.,Malaysian Rubber Board | Mohd. Aris M.N.,Malaysian Rubber Board
Journal of Rubber Research | Year: 2014

Lignin and cellulose distribution in plant parts of seven Hevea species which are H. brasiliensis (RRIM 3001), H. benthamiana, H. guianensis, H. pauciflora, H.spruceana, H. nitida and H. camargoana were studied to ascertain the pattern of distribution among plant parts, to project total lignin and holocellulose that could be extracted from unused plant parts of the rubber tree during rubber replanting programmes as well as to suggest new planting materials in rubber forest plantation for the purpose of wood harvesting. The study has successfully analysed different distribution patterns among plant parts of Hevea trees, where lignin was found to be of highest concentration in the leaf while holocellulose concentration was highest in clear bole samples. For a 25,000 ha area in rubber forest plantation replanting programme, the estimated amount of lignin combustion energy and ethanol production are 13.34 TJ and 545 million kg respectively, while for the replanting programme in rubber plantation which involves a 20,000 ha area, the estimated amount of lignin combustion energy and ethanol production are 13.94 TJ and 570 million kg, respectively. Since lignin is a co-product of biofuel processes it can be recovered and used for power generation in biofuel production. The study has also recognised H. spruceana and H. benthamiana as possible planting materials for rubber forest plantation since both species have a comparable high biomass weight and high amount of lignin as well as holocellulose in unused plant parts. Immediate future work will focus on investigating optimal methods and conditions for biomass pretreatment, cellulosic hydrolysis and sugar fermentation to yield ethanol.


Patent
Malaysian Rubber Board | Date: 2012-07-05

A practical and environmentally-friendly method, i.e. the high temperature-mechanical mixing by using an internal mixing device and a two-roll open milling device is used to produce the carbon blacks-free electrically conductive sulfur-vulcanised rubber blends of solid poly(butadiene-co-acrylonitrile) and solid sulfonic acid doped polyaniline. The addition of sulfur vulcanisation system does not affect the electrical properties of the vulcanised blends. All vulcanised blends prepared by using this method show useful electrical conductivities up to the order of 10^(2 )S/cm, good tensile strengths up to 18.0 MPa and colourable with the addition of a whitening agent. As a result, they have good potential to be used for manufacturing any antistatic products, electrostatic discharge or dissipative products and electromagnetic or radio frequency interferences shielding products.


Patent
Malaysian Rubber Board | Date: 2010-04-14

A practical and environmentally-friendly method, i.e. the high temperature-mechanical mixing by using an internal mixing device and a two-roll open milling device is used to produce the carbon blacks-free electrically conductive sulfur-vulcanised rubber blends of solid poly(butadiene-co-acrylonitrile) and solid sulfonic acid doped polyaniline. The addition of sulfur vulcanisation system does not affect the electrical properties of the vulcanised blends. All vulcanised blends prepared by using this method show useful electrical conductivities up to the order of 10^(2 )S/cm, good tensile strengths up to 18.0 MPa and colourable with the addition of a whitening agent. As a result, they have good potential to be used for manufacturing any antistatic products, electrostatic discharge or dissipative products and electromagnetic or radio frequency interferences shielding products.


Smg

Trademark
Malaysian Rubber Board | Date: 2010-10-26

gloves for medical use, gloves for use in hospitals, latex medical gloves, surgical gloves.

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