Tensile Strength Analysis of High Density Polyethylene for Injection Moulded Parts
This paper investigates the performance of pure high density polyethylene (p-HDPE) and recycled high density polyethylene (r-HDPE) by comparing the tensile strength of both materials. The specimens were injected by injection moulding machine and the parameters investigated were melting temperature (200-240°C), injection pressure (75-95 MPa), and holding time (20-30 s). Response Surface Methodology (RSM) was used to accommodate the experimental run as well as to analyse the experimental results. The result from Analysis of Variance (ANOVA) showed that the melting temperature is the most significant parameters affecting the tensile strength of both materials with the F-value is 307.58, followed by injection pressure (77.32) and holding time (19.67). The result also showed that the tensile strength of both materials increase with increasing of melt temperature, injection pressure and holding time. The optimal tensile strength of p-HDPE (27.04 MPa) was obtained at the melting temperature of 240°C, injection pressure of 95 MPa and holding time of 20 s. On the other hand, the optimal tensile strength of r-HDPE (16.058 MPa) was achieved at the melting temperature of 240°C, injection pressure of 95 MPa, and holding time of 29 s. The reduction percentage of tensile strength for r-HDPE as compared to p-HDPE was in the range of 43.478% - 40.703%. Even though the tensile strength of r-HDPE has been reduced by around 40% as compared to p-HDPE, the r-HDPE can still be utilised for packaging application such as containers, bottles, and jars. Therefore, this will help to significantly reduce waste in order to sustain the environment.
M. L. H. Low, and K. S. Lee, “Mould data management in plastic
injection moulding industries,” International Journal of Production
Research, vol. 46, pp. 6269-6304, Nov. 2008.
T. C. Chang, and E. Faison, “Shrinkage behavior and optimization of
injection molded parts studied by the Taguchi method,” Polymer
Engineering and Science, vol. 41, pp. 703-710, May 2008.
D. M. Bryce, Plastic injection molding: manufacturing process
fundamentals. Mich,USA: Society of Manufacturing Engineers, 1996.
D. C. Montgomery, Design and Analysis of Experiments, John Wiley,
C. M. Hsu, “Improving the electroforming process in optical
recordable media manufacturing via an integrated procedure,”
Engineering Optimization, vol. 36, pp. 659–675, Dec. 2004.
J. P. Wang, Y. Z. Chen, X. W. Ge, and H.Q. Yu, “Optimization of
coagulation-flocculation process for a paper-recycling wastewater
treatment using response surface methodology,“ Colloids and
Surfaces A – Physicochemical and Engineering Aspects, vol. 302, pp.
-210, Jul. 2007.
D. D. Frey, F. Engelhardt, E. M. Greitzer, “A role for ‘‘one-factor-attime’’ experimentation in parameter design,” Research in Engineering
Design, vol. 14, pp. 65-74, May 2003.
R. M. Solow, “The economics of resources or the resources of
economics,” American Economic Review, vol. 64, pp. 1-14, 1974.
L. R. Brown, Earth Policy Institute. Eco-Economy: Building an economy for the earth, 1st ed. New York: Earthscan, 2001.
C. R. Santi, A. C. Correa, S. Manrich, “Films of post-consumer
polypropylene composites for the support layer in synthetic paper,”
Polímeros, Vol. 16, pp. 123-128, Jun 2006.
A. F. Martins, J. C. Suarez, E. B. Mano, “Recycled polyolefin products with higher performance than the corresponding virgin materials,” Polímeros, Vol. 9, pp. 27-32, Dec. 1999.
A. Conroy, S. Halliwell, T. Reynolds, “Composite recycling in the
construction industry,” Composites Part A: Applied Science and
Manufacturing, Vol. 37, pp. 1216-1222, Aug. 2006.
M. M. Rahman, M. A. Islam, M. Ahmed, “Recycling of Waste Polymeric
Materials as a Partial Replacement for Aggregate in Concrete,” Int. Conf. on Chemical, Environmental and Biological Sciences, Penang: Malaysia, 2012.
M. Batayney, I. Marie, I. Asi, “Use of selected waste materials in concrete mixes,” Waste Management, Vol. 27, pp. 1870-1876, 2007.
L. Leonard, “Comparable Data for Plastic Materials -- Help is on the Way,” Plastics Design Forum, pp. 37-40, 1993.
M. Kohan, Nylon Plastics Handbook. New York: Hanser / Gardner
Publications, Inc., 1995, pp. 631.
G. H. Choi, K. D. Lee, N. Chang, S. G. Kim, “Optimization of Process Parameters of Injection Moulding with Neural Network Application in a Process Simulation Environment,” CIRP Annals-Manufacturing Technology, Vol. 43, pp. 449-452, Jan. 1994.
W. He, Y. F. Zhang, K. S. Lee, T. I. Liu, “Development of a Fuzzy-Neuro System for Parameter Resetting of Injection Moulding,” Journal of
Manufacturing Science and Engineering, Vol. 123, pp. 110-118, Feb. 2001.
B. Ozcelik, A. Ozbay, E. Demirbas, “Influence of injection parameters and mold materials on mechanical properties of ABS in plastic injection molding,” International Communications in Heat and Mass Transfer Vol. 9, pp. 1359-1365, Nov. 2010.
Z. A. Khan, S. Kamaruddin, A. N. Siddiquee, “Feasibility study of use of recycled High Density Polyethylene and multi response optimization of injection moulding parameters using combined grey relational and principal component analyses,” Materials and Design, Vol. 31. Pp. 2925-2931, Jun 2010.
N. C. Fei, S, Kamaruddin, A. N. Siddiquee, Z. A. Khan, “Experimental investigation on the recycled HDPE and optimization of injection moulding process parameters via Taguchi method,” Int J Mech Mater Eng Vol. 1, pp. 81-91, Jan. 2011.
S. E. Mirvar, R. M. Kaleybar, A. Afsari, “Optimization of Injection Molding Process Parameters to Increase the Tensile Strength in Polyamide-
Specimen Using the Taguchi Method,” In Advanced Materials Research,
Vol. 341, pp. 395-399, 2012.
R. Pareek, J. Bhamniya, “Optimization of Injection Moulding Process using Taguchi and ANOVA,” International Journal of Scientific and Engineering Research, Vol. 4, Jan. 2013.
A. B. Humbe, M. S. Kadam, “Optimization of Critical Processing
Parameters for Plastic Injection Molding for Enhanced Productivity and
Reduced Time for Development,” International Journal of Mechanical
Engineering & Technology, Vol. 6, pp. 223-226, 2013.
W. L. Chen, C. Y. Huang, C. Y. Huang, “Finding efficient frontier of
process parameters for plastic injection molding,” Journal of Industrial
Engineering International, Vol. 1, pp. 25, Dec. 2013.
E. Kuram, G. Timur, B. Ozcelik, F. Yilmaz, “Influences of injection
conditions on strength properties of recycled and virgin PBT/PC/ABS,”
Materials and Manufacturing Processes, Vol. 10, pp. 1260-1268, Oct. 2014.
F. Gu, P. Hall, N. J. Miles, “Experimental Investigating Effect of
Reprocessing on Properties of Composites based on Recycled
Polypropylene.” Proceedings of International Conference on Power
Electronics and Energy Engineering, 2015.
S. Gobinath, D. Elangovan, E. Sivakumar, S. R. Devadasan, “Viability Study of Use of Reprocessed High Density Polyethylene for Manufacturing Products and Multi Response Optimization of Injection Moulding Parameters Using Grey Relational Analysis,” Polymers & Polymer Composites, Vol. 7, p. 547, Aug. 2016.
ASTM Subcommittee, International A. Standard test method for tensile properties of plastics ASTM D638-10. West Conshohocken., ASTM International, 2010.
A. Dasari, R. D. K. Misra, “On the strain rate sensitivity of high density polyethylene and polypropylenes,” Materials Science and Engineering: A, Vol. 358, pp. 356-371, Oct. 2003.
H. W. Starkweather, E. Richard, “Effect of spherulites on the mechanical properties of nylon 66,” Journal of Applied Polymer Science, Vol. 1, pp. 236-239, Mar. 1959.
S. A. Cruz, M. Zanin, “Dielectric Strength of the Blends of Virgin and Recycled HDPE,” Journal of Applied Polymer Science, Vol. 91, pp. 1730- 1735, Feb. 2004.
R. Su, K. Wang, Q. Zhang, F. Chen, Q. Fu, “Effect of melt temperature on the phase morphology, thermal behavior and mechanical properties of injection-molded PP/LLDPE blends,” Chinese Journal of Polymer Science, Vol. 28, pp. 249-255, Mar. 2010.
S. Liang, H. Yang, K. Wang, Q. Zhang, R. Du, Q. Fu, “Unique crystal morphology and tensile properties of injection-molded bar of LLDPE by adding HDPE with different molecular weights,” Acta Materialia, Vol. 56, pp. 50-59 Jan. 2008.
F. Gu, P. Hall, N. J. Miles, Q. Ding, T. Wu, “Improvement of mechanical properties of recycled plastic blends via optimizing processing parameters using the Taguchi method and principal component analysis,” Materials and Design, Vol. 62, pp. 189-198, Oct. 2014.
A. B. Humbe, M. S. Kadam, “Optimization of Process Parameters of Plastic Injection Moulding For Polypropylene To Enhance Productivity
and Reduce Time For Development,” International Journal of Mechanical Engineering & Technology, Vol. 5, pp. 157-169, Nov. 2014.
B. Ozcelik, “Optimization of Injection Parameters for Mechanical
Properties of Specimens with Weld Line of Polypropylene using Taguchi
Method,” International Communications in Heat and Mass Transfer, Vol.
, pp. 1067-1072, Oct. 2011.
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