Dynamic mechanical properties of parts from multicavity injection mould

• Autorzy: Bociąga, E. , Jaruga, T.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The examination of dynamic mechanical properties of injection moulded parts, obtained from different cavities of injection mould, was the purpose of this research. The parts were manufactured from polypropylene. Design/methodology/approach: The testing method used was DMTA - "Dynamic Mechanical Thermal Analysis" - which is often used to determine the properties of polymers, blends and composites as well as the manufactured parts. Findings: The differences in storage modulus E' and loss factor tan delta of parts from particular mould cavities were found. The differences are caused by polymer flow and thermal conditions specific for each cavity. Research limitations/implications: An injection mould with geometrically balanced runners was used for investigation. The differences in parts' properties occur for every injection mould, but they are dependent on the cavities layout and runners configuration. Practical implications: The results of investigation provided the information that there are significant differences in parts' properties. Knowing that, the mould designers should take an effort to minimize the temperature differences in the mould and to assure the equal cavity filling. Originality/value: Usually the naturally balanced runners were supposed to assure the equal filling for all the cavities. Lately some research was made which discovered that this is not true. There were some solutions of this problem proposed. All investigation was focused on simultaneous plastic flow into all cavities, but there were no investigation of parts' properties.

Słowa kluczowe

PL

odkształcenie plastyczne; formowanie wtryskowe; wtryskiwanie; właściwości mechaniczne dynamiczne

EN

plastic forming; injection moulding; dynamic mechanical properties

• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 23, nr 2
• Strony: 83-86
• Opis fizyczny: Bibliogr. 15 poz., fot., rys.

Twórcy

autor

Bociąga, E.

autor

Jaruga, T.

• Institute of Polymer Processing and Production Management, Czestochowa University of Technology, Al. Armii Krajowej 19 c, 42-200 Częstochowa, Poland,

Bibliografia

• [1] X.G.Ye, K.S.Lee, J.Y.H.Fuh, Y.F.Zhang, A.Y.C.Nee, Automatic initial design of injection mould, International Journal of Materials and Product Technology 15 (2000) 503-517.
• [2] P. Postawa, J. Koszkul, Influence of processing conditions on changing of shrinkage and mass POM injection molding parts, Proceedings of the 13th Scientific International Conference „Achievements in Mechanical and Materials Engineering” AMME'2005, Gliwice-Wisła, 2005, 531-534.
• [3] L. Xu, W. Xu, Y. Chen, Plastic injection molding process optimization using software tools, International Journal of Vehicle Design 25 (2001) 53-63.
• [4] J.P. Beaumont, R. Nagel, R. Sherman, Successful Injection Molding, Hanser Publishers, Munich, 2002.
• [5] R. Sikora, E. Bociąga, Characteristic of Tools in Precision Multicavity Injection Moulding, Polymers Manufacturing 81-82 (2001) 161-168 (in Polish).
• [6] J.P. Beaumont, Runner and Gating Design Handbook. Tools for Successful Injection Moulding, Hanser, Munich Cincinatti, 2004.
• [7] Beaumont Runner Technologies Inc., http://meltflipper.com .
• [8] H.E. Casaldi, and T. Michel, Process Window as Effected by Shear Induced Flow Imbalance in Multicavity Moulds ANTEC 2001, Vol. 3, 2001, 3112-3116.
• [9] P.S. Cook, H. Yu, V. Clinton, V. Kietzmann, F.S. Costa, Prediction of flow imbalance in geometrically balanced feed systems, Proceedings of the Scientific International Conference ANTEC 2005, Vol. 1, 2005, 526-530.
• [10] R. Cooney, D. Neill, L. Pomorski, An Investigation of Part Variation in Multi-Cavity Pressure Control, Proceedings of the Scientific International Conference ANTEC 2001, Vol. 3, 2001, 3116-3120.
• [11] M. Makowski, Runners design for semi-crystalline plastics in injection moulds, Modern Injection Moulds, Design and Exploitation Problems, Proceedings of the Scientific International Conference PLASTECH 2001, Warsaw, 179 (in Polish).
• [12] G.Y. Su, H. Yokoi, W.M. Yang, A Study on Filling Imbalance of Plastic Injection Moulding in Multi-cavity Mould with “H” Pattern Runner System, PPS 2003 - Greece.
• [13] E. Bociąga, T. Jaruga, J. Koszkul, Plastic Flow Investigation in Multicavity Injection Mold, Proceedings of the 12th Scientific International Conference „Achievements in Mechanical and Materials Engineering” AMME'2003, Gliwice-Zakopane, 2003, 107-110.
• [14] E. Bociąga, T. Jaruga, Microscopic investigations of polymer flow in the runners of 16-cavity injection mold, Polymers 51 (2006) 843-851 (in Polish).
• [15] E. Bociąga, T. Jaruga, Visualization of melt flow lines in injection moulding, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 331-334.