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Factors affecting metering accuracy in reaction injection molding
Author(s) -
Olabisi Olagoke,
Gau Y.
Publication year - 1982
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.760220308
Subject(s) - metering mode , momentum (technical analysis) , materials science , calibration , molding (decorative) , mixing (physics) , mechanics , process engineering , mechanical engineering , head (geology) , composite material , automotive engineering , engineering , mathematics , physics , statistics , finance , quantum mechanics , geomorphology , economics , geology
Several parameters affecting the metering accuracy in reaction injection molding (RIM) are identified and their effects evaluated on a laboratory‐scale machine (mini‐RIM HP‐6. Polyurethane Technology of America). The experimental results show that the delay time must be greater than a critical value in order for the system pressure to attain the steady‐state value; that the matching of the recirculation and pouring pressure is necessary to have consistent amounts of materials at the calibration or mixing head; and that a variable momentum ratio can have an adverse effect on the metering accuracy. Two approaches are used in the determination of the optimum process parameters for the mini‐RIM machine and an attempt is made to explain the effect of momentum ratio variation on the metering accuracy in RIM.