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M. Heneczkowski

Simulations of injections of selected multiprocessed thermoplastics

Polimery 2001, No 5, 359



Summary

The deteriorating processability in multiprocessed (injection molding) LDPE, PP, and glass fiber-reinforced PET thermoplastics (Table 1), observed in mold filling and in molded piece warpage (Tables 2-4, 7, 8), was studied by simulations using the I-DEAS Master SeriesTM 4 system. Melt viscosity of the multiprocessed polymers was modeled by using database-retrieved equations (la, b) which relate the viscosity to process parameters. Temperature and pressure relations of polymer density allowed to estimate shrinkage variations in the recyclates (Table 2). Simulations showed mold filling to be only slightly affected by viscosity changes. The calculated warpage was distinctly lower in glass fiber-reinforced PET molded pieces than in unreinforced polyolefins. A special holding pressure profile (Table 5) was found to suppress warpage in both polyolefins examined.
Keywords: LDPE, PP, glass fiber-reinforced PET, multiple processing, computer simulation using I-DEAS Master Series program, mold filling, shrinkage of recyclate, molded piece warpage
M. Heneczkowski (547.1 KB)
Simulations of injections of selected multiprocessed thermoplastics