Set Point Based Material Selection Method in Case of Recycled Polypropylene Application

Abstract:

Due to the economic reasons of the injection moulding process, robust technology set point was given in the case of a polypropylene part manufacturing. The part, named lid plate was a relatively humble product not sensitive for small strength parameter changing. K392 coded polypropylene (PP) was given as reference raw material for injection moulding. The technical task was to replace the reference material by using recycled PP. It was necessary to keep the production cycle term. The flow characteristics of the offered recycled polymers were previously unknown. New method and capillary rheometry experimental technique was used to aid the material selection. In the method, the repeatability and the accuracy of rod type capillary rheometry was investigated in order to get more reliable flow behavior data of recycled PP polymer. Relatively low repeatability deviance could be determined in the range of 800-1100 s^-1 shear rate range by using rod capillary rheometry. By means of the adequate validated rheometry, the recycled polypropylene could be applied for the given technology set point based forming process.

• Periodical: Materials Science Forum (Volume 885)
• Pages: 257-262
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.885.257
• Online since: February 2017
• Authors: György Czél*, Mate Zattler
• Keywords: Capillary Rheometry, Flow Curve Repeatability, Injection Molding, Recycled PP Application, Round Capillary Die, Technology Set Point

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