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Dynamics and control of pressure in the injection molding of thermoplastics
Author(s) -
Kamal M. R.,
Patterson W. I.,
Conley N.,
Fara D. Abu,
Lohfink G.
Publication year - 1987
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760271809
Subject(s) - nozzle , materials science , molding (decorative) , pseudorandom binary sequence , injection molding machine , binary number , mechanics , mechanical engineering , composite material , mathematics , engineering , physics , mold , arithmetic
A detailed study was carried out to understand the dynamics of pressure variations at different points in the injection‐molding system. Thus, hydraulic, nozzle, and cavity pressures were evaluated, in addition to the pressure gradient in the cavity. Both steps and pseudorandom binary sequences (PRBS) were employed to obtain and compare dynamic models describing these variables. Subsequently, these models were employed to evaluate and select optimal controllers for the different variables.