Influence of the processing conditions on the dynamic mechanical properties of gas assisted injection moulded parts

• Autorzy: Postawa P. , Stachowiak T. , Jaruga T.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The main purpose of this research was the estimation of the influence of processing conditions on dynamic mechanical properties moulidings made by Gas-Assisted Injection Moulding technology (GAIM). The research samples were cut from children cart holder - part made by gas-assisted injection moulding and tested using DMTA method. Design/methodology/approach: One of the modern testing methods was used - Dynamic Mechanical Thermal Analysis which is used very often to determinate dynamic mechanical properties and transformations of the structure of polymers and composites as well as parts manufactured from these materials. Findings: The impact of processing conditions used for manufacturing the parts made by gas-assisted injection moulding technology on mechanical properties of these parts were examined. The differences in storage modulus E' and loss factor tand were investigated. During the tests three of processing conditions were changed, on the base of the experimental plan generated in STATISTICA software, in Design of Experiment module. Research limitations/implications: The differences in storage modulus - E' and mechanical loss factor tgd were presented. The research carried out was limited to one material (Copolymer of polypropylene and polyethylene PP/PE included 10-14% of PE fraction) however during investigations some of processing conditions were changed. Practical implications: Received and presented results are very useful from the point of view of industrial applications and they can contribute to the quality improvement of the parts obtained using gas-assisted injection moulding technology. Gas flow in melt polymer in GAIM technology is very unpredictable and it causes many defects in produced parts. Originality/value: A new approach to the estimation of mechanical properties of moulded parts, produced using GAIM technology, gives information about the influence of the processing conditions on mechanical properties and quality of the parts.

Słowa kluczowe

EN

polymeric materials; GAIM; gas assisted injection moulding; thermal analysis; DMTA method

PL

materiały polimerowe; GAIM; formowanie wtryskowe w osłonie gazowej; analiza termiczna; metoda DMTA

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2010
• Tom: Vol. 44, nr 2
• Strony: 104--111
• Opis fizyczny: Bibliogr. 42 poz.

Twórcy

autor

Postawa P.

autor

Stachowiak T.

autor

Jaruga T.

• Department of Polymer Processing and Production Management, Czestochowa University of Technology, Al. Armii Krajowej 19C, 42-201 Częstochowa, Poland,

Bibliografia

• [1] E. Bociąga, Special methods of injection polymer materials, WNT, Warszawa 2008.
• [2] L. Chen, J. Li, H. Zhou, D. Li, Z. He, Q. Tang, A study on gas-assisted injection molding filling simulation based on surface model of a contained circle channel part, Journal of Materials Processing Technology 208 (2008) 90-98.
• [3] R.D. Chien, S.C. Chen, M.C. Jeng, H.Y. Yang, Mechanical properties of gas-assisted injection moulded PS, PP and Nylon parts, Polymer 40 (1999) 2949-2959.
• [4] Y. Dimakopoulos, J. Tsamopoulos, Gas-Assisted Injection Molding In Straight And Constricted Tubes, Polymer. Engineering . Science 46 (2006) 47-68.
• [5] S.Y. Han, J.K. Kwag, C.J. Kim, T.W. Park, Y.D. Jeong, A new process of gas-assisted injection molding for faster cooling, Journal of Materials Processing Technology 155–156 (2004) 1201-1206.
• [6] H.P. Heim, Gas Assisted Injection Moulding - Principles for the Robust Layout of Process and Moulding, PPS 19, Melbourne, Australia, 2003.
• [7] L. Huang, W. Yang, B. Yang, M. Yang, G. Zheng, H. An, Banded spherulites of HDPE molded by gas-assisted and conventional injection molding, Polymer 49 (2008) 4051-4056.
• [8] L.M. Johnson, P. Olley, P.D. Coates, Gas assisted injection moulding: An empirical model for residual wall thickness based on processing conditions and comparison with simulation, PPS 18, Guimaraes, Portugal 2002.
• [9] L.M. Johnson, P. Olley, P.D. Coates, F. Ilinca, J.F. Hetu, Water/Gas Assisted Injection moulding: Comparison of filling simulation results with the instrumented process, PPS 21, Leipzig, Germany, 2005.
• [10] J.C. Liang, Y. Li, D.H. Zhou, Z.R. Li, W. Zhang, Analysis of diffusion mechanism between gas and melt in gas-assisted injection molding, Journal of Materials Processing Technology 187-188 (2007) 685–689.
• [11] S.J. Liu, C.Y. He, A study of the weld line strength in gas assisted injection molding thermoplastic, Plastics Rubber and Composites 31 (2002) 36.
• [12] S.J. Liu, I.H. Lin, Parameters Affecting the Surface Glossy Difference of Gas Assisted Injection Molded Parts, PPS 18, Guimaraes, Portugal 2002.
• [13] Liu S.J., Wu Y.C., Dynamic visualization of cavity-filling process in fluid-assisted injection molding-gas versus water, Polymer Testing 26 (2007) 232–242.
• [14] S.J. Liu, Y.C.Wu., The effect of processing parameters on the stability of gas penetration in gas assist injection molded bifurcation parts, International Polymer Processing 15 (2000) 297-303.
• [15] A. Polynkin, L. Bai, J.F.T. Pittman, J. Sienz, Some insights into the fundamentals of water assisted injection moulding, PPS 24, Salerno, Italy 2008.
• [16] M. Sanchez-Soto, A. Gordillo, B. Arasanz, J. Aurrekoetxea, L. Aretxabaleta, Optimizing the gas-injection moulding of an automobile plastic cover using an experimental design procedure, Journal of Materials Processing Technology 178 (2006) 369–378.
• [17] Y.K. Shen, Study of the gas-liquid interface and polymer melt front in gas assisted injection molding, Int. Comm. Heat Mass Transfer 24 (1997) 295-302.
• [18] Y.K. Shen, The study of polymer melt front, gas front and solid layer in filling stage of gas assisted injection molding, Int. Comm. Heat Mass Transfer 28 (2001) 139-148.
• [19] United State Patent, Gas Assisted Moulding, Patent No. US 6,666,999 B1, 2003.
• [20] United State Patent, Gas injection moulding method and apparatus, Patent Number. US 2005/0133945 A1, 2005.
• [21] United State Patent, Process for gas assisted and water assisted injection molding, Patent number US 6,896,844 B2, 2005.
• [22] United State Patent, Process for gas assisted and water assisted injection molding, Patent Number 6.896.844 B2, 2005.
• [23] United States Patent, Gas assisted injection molding apparatus, Patent number 5,044,924, 1991.
• [24] G.Q. Zheng, W. Yang, L. Huang, M.B. Ynag, W. Li, C.T. Liu, C.Y. Shen, Flow-induced fiber orientation in gas-assisted injection molded part, Materials Letters 61 (2007) 3436-3439.
• [25] H. Zhou, D. Li, Filling simulation and gas penetration modeling for gas-assisted injection molding, Applied Mathematical Modeling 27 (2003) 849-860.
• [26] S.H. Tang, Y.M. Kong, S.M. Sapuan, R. Samin, S. Sulaiman, Design and thermal analysis of plastic injection mould, Journal of Materials Processing Technology, 171 (2006) 259-267.
• [27] J.X. Li, W.L. Cheung, Effect of mould temperature on the formation of α/β polypropylene blends in injection moulding, Journal of Materials Processing Technology 63 (1997) 472-475.
• [28] E. Bociąga, T. Jaruga, Experimental investigation of polymer flow in injection mould, Archives of Materials Science and Engineering 28 (2007) 165-172.
• [29] E. Bociąga, T. Jaruga, Dynamic mechanical properties of parts from multicavity injection mould, Journal of Achievements in Materials and Manufacturing Engineering, 23 (2007) 83-86.
• [30] A.G. Smith, L.C. Wrobel, P.S. Allan, P.R. Hornsby, A computational model for the cooling phase of injection moulding, Journal of Materials Processing Technology 195 (2008) 305-313.
• [31] R. Pantani, A. Sorrentino, V. Speranza, G. Titomanlio, Molecular orientation in injection moldings of thermoplastics polymers, The Polymer Processing Society, PPS-17 Conference Proceedings, Montreal, Canada, 2001.
• [32] P. Postawa, Analyzing of influence processing condition on chosen properties of injection moulded parts, Disertation, Faculty of Mechanical Engineering and Computer Science, Czestochowa University of Technology, Częstochowa, 2003 (in Polish).
• [33] R. Brown, Handbook of polymer testing, Physical Methods, Marcel Dekker, 1999.
• [34] ISO DIN 11359, Plastics - Thermomechanical Analysis, Part 2, Determination of coefficient of linear expansion and glass transition temperature.
• [35] H. Möhler, S. Knappe, Thermal Analysis for Polymers, NETZSCH-Gerätebau GmbH, Selb, Germany 1998.
• [36] W. Przygodzki, Physical Method In Polymers Research, PWN, Warsaw, 1990 (in Polish).
• [37] W. Szlezyngier, Methodology of polymers research, Publ. Rzeszow Univ. of Technology, Rzeszow 1992 (in Polish).
• [38] D. Kwiatkowski, J. Nabialek, P. Postawa, Influence of injection moulding parameters on resistance for cracking on example of PP, Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 97-100.
• [39] P. Postawa, D. Kwiatkowski, Residual stress distribution in injection molded parts, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 171-174.
• [40] A. Gnatowski, J. Koszkul, Investigation PA/PP mixture properties by means of DMTA method, Journal of Materials processing Technology 175 (2006) 212-217.
• [41] E. Bociąga, T. Jaruga, Visualization of melt flow lines in injection moulding. Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 331-334.
• [42] D. Kwiatkowski, Determination of crack resistance on the basis of the J integral for talc filled PP and PA composites, Proceedings of the 13th “Achievements in Mechanical and Materials Engineering” AMME’2005, Gliwice-Wisła, 2005, 391-394.