Effect of Temperature and Pressure on Spray Properties of Tapioca Starch Adhesives


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The use of starches as a material in urea granules coating industry is a recent development. The pure starches do not meet the standards set by many industrial processes due to slow tacking and to low viscosities, and require necessary modifications in their physical properties. The objective of the work was to synthesize and characterize the tapioca base biopolymers for future urea granules coating applications. For this purpose, three compositions of starch-urea-borate complex were prepared and their sprays were characterized using a bottom to top spraying system. The characterization of physical properties of the synthesized starch adhesives was carried out by determining the effect of temperature, shear rate and mass concentration of thickener/stabilizer on solution viscosity. A shear-thinning behavior followed by shear-thickening was observed for all solution compositions. This shear thinning to shear thickening transition becomes less prominent above 80°C of solution heating temperature. Using a high speed camera (Phantom v9.1), the jet breakup dynamics were also visualized as a function of the solution temperature and pumping pressure. . An increasing trend was noticed in spray cone angle with temperature upto 80°C and thereafter it became almost constant. Similarly, a linear increase in spray tip penetration was noticed with time from start of the injection which became steady after 70 ms of injection time.



Edited by:

Mohd Jailani Mohd Nor, Bashir Mohamad Bali Mohamad, Mariana Yusoff et al.






M. Y. Naz et al., "Effect of Temperature and Pressure on Spray Properties of Tapioca Starch Adhesives", Applied Mechanics and Materials, Vol. 699, pp. 81-86, 2015

Online since:

November 2014




* - Corresponding Author

[1] L. J. Meinke, Z. Mayo and T. J. Weissling, Pheromone delivery system: western corn rootworm (Coleoptera: Chrysomelidae) pheromone encapsulation in a starch borate matrix, J. Econ. Entomol., vol. 82, pp.1830-1835, (1989).

DOI: 10.1093/jee/82.6.1830

[2] S. Widiarto, Effect of borax on mechanical properties and biodegradability of sago starch - poly(vinylalcohol) blend films, J. Sains Tek, vol. 2, pp.151-157, (2005).

[3] Patrick Ilg, Markus Hütter and Martin Kröger, Ideal contribution to the macroscopic quasiequilibrium entropy of anisotropic fluids, Phys. Review E, vol. 83, pp- 62011, (2011).

DOI: 10.1103/physreve.83.061713

[4] J. Mewis and A. B. Metzner, The rheological properties of suspensions of fibres in Newtonian fluids subjected to extensional deformations, J. Fluid Mech., vol. 62, pp.593-600 (1974).

DOI: 10.1017/s0022112074000826

[5] S. Jin, Y. Wang, J. He, Y. Yang, X. Yu and G. Yue, Preparation and properties of a degradable interpenetrating polymer networks based on starch with water retention, amelioration of soil, and slow release of nitrogen and phosphorus fertilizer, J. Appl. Polym. Sci., (2012).

DOI: 10.1002/app.38162

[6] M.Y. Naz, , S.A. Sulaiman, B. Ariwahjoedi and K.Z.K. Shaari, Characterization of Modified Tapioca Starch Solutions and Their Sprays for High Temperature Coating Applications, Sci. World J., vol. 2014, (2014).

DOI: 10.1155/2014/375206

[7] M.Y. Naz, , S.A. Sulaiman, B. Ariwahjoedi and Ku Zilati, Visual study of hollow cone water spray jet breakup process at elevated temperatures and pressures, Appl. Mech. Mater., vol. 465-466, pp.485-489 (2014).

DOI: 10.4028/www.scientific.net/amm.465-466.485

[8] M.Y. Naz, , S.A. Sulaiman, B. Ariwahjoedi and K.Z.K. Shaari, Investigation of vortex clouds and droplet sizes in heated water spray patterns generated by axisymmetric full cone nozzles, Sci. World J., vol. 2013, (2013).

DOI: 10.1155/2013/796081

[9] C. Dumouchel, The experimental investigation on primary atomization of liquid streams, Exp. Fluids, Vol. 45, pp.371-422 (2008).

DOI: 10.1007/s00348-008-0526-0

[10] M.Y. Naz, , S.A. Sulaiman and B. Ariwahjoedi, Experimental study of airless spray jet breakup at elevated temperature and pressure, Appl. Mech. Mater., vol. 393, pp.711-716 (2013).

DOI: 10.4028/www.scientific.net/amm.393.711

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