The Influence of the Processing Parameters in the Ultrasonic Activated Injection and Extrusion

Abstract:

A multifunction experimental system was designed in a flexible configuration allowing simulation of thermoplastic material processing through extrusion, injection or micro-injection in the presence of the ultrasonic activation. The paper presents the results from a set of experiments performed at first in classical extrusion conditions of most common polyolefines (LDPE and PP) and then in the presence of the ultrasonic activation. The main processing parameters were compared, analyzed and ranked after their effect on extruded flow as output data. For the specific conditions of extrusion through narrow interstice, the ultrasonic activation was proved to be the main factor of influence overcoming the classical factors as temperature and the pressure. The last presented set of experiments was focused on particular processing conditions of injection through narrow section thin-wall injection and microinjection. In these cases, the ultrasonic activation does not play an important role as single influence factor but could amplify or strengthen the influence of classical setting parameters of the process: mould temperature, injection pressure and temperature.

• Periodical: Applied Mechanics and Materials (Volume 420)
• Pages: 149-153
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.420.149
• Online since: September 2013
• Authors: Andrei Adam, Daniel Stan
• Keywords: Extrusion, Melted Polymer, Process Parameter, Thermo-Pellicular Effect, Ultrasonic Activation

References

[1] G. Chen, S. Guo and H. Li: Ultrasonic improvement of rheological behavior of polystyrene. Journal of Applied Polymer Science, vol. 84 (2002), p.2451–2460.

DOI: 10.1002/app.10535

[2] S. Guo, Y. Li, G. Chen, H. Li: Ultrasonic improvement of rheological and processing behaviour of LLDPE during extrusion. Polymer International Journal, vol. 52, p.68–73 (2003).

DOI: 10.1002/pi.1005

[3] T. Iclanzan, D. Stan: A possible new ultrasonic thermo-pellicular effect and applications. International Journal of Material Forming, vol. 1, suplem. 1, pp.743-746, edited by Spriger France (2008).

DOI: 10.1007/s12289-008-0282-y

[4] T. Iclanzan, D. Stan: Limits in the ultrasonic activation of polymeric materials in injection extrusion processes. Materiale Plastice, vol. 42, issue 2, pp.127-132 (2005).

[5] ISI Web of Knowledge, Derwent Innovations Index database, Patent JP 2001-001370 and Patent JP 2001-062878, Available from: www. derwent. com, Accesed: 03 febr. (2013).

[6] A. Kikuchi, J.P. Coulter, D. Angstatd, A. Pinarbasi: Study of application of ultrasonic wave to injection molding. J. of Manufacturing Sci. and Engg. No 402, pp.127-132 (2005).

[7] H. Kutruff: Ultrasonics-Fundamentals and Applications. Elsevier, Appl. Sci. Paris (1991).

[8] A. Sato, I. Hiroschi, K. Kiyohito: Study of Application of Ultrasonic Wave to Injection Molding. Polym. Engg. & Sci. no. 44, pp.768-773 (2009).

[9] D. Stan: Activation ultrasonique des thermo-plastiques lors de la mise en oeuvre par injection et extrusion, these de doctorat. Univ. Montpellier France.

[10] D. Stan, T. Iclanzan, M. Abadie: L`effect de surface dans le cas de l`activation ultrasonique des milieux viquueux sous pression. Synthetic Polymer J. , ed. by Romanian Academy, vol. VII, pp.84-92, Bucuresti, Romania (2000).

[11] C. Yurong, L. Huilin: Influence of ultrasounds on the processing and structure of polypropylene during extrusion, Polym. Engg. & Sci., vol. 42, issue 7, pp.1534-1540, (2002).