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An experimental study of sandwich injection molding of two polymer melts using simultaneous injection
Author(s) -
White James L.,
Lee BiingLin
Publication year - 1975
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.760150702
Subject(s) - materials science , rheology , molding (decorative) , annulus (botany) , polymer , mold , composite material , viscosity , core (optical fiber) , transfer molding
An experimental study of two phase flow of polymer melts relating to injection molding has been carried out. The experiments specifically concern rheological phenomena which may occur when two melts are simultaneously injected through a runner system leading to a mold cavity. Injection in the form of annulus‐core configurations and simple stratified flow are investigated. A new injection molding method is proposed which is based upon the latter technique. Encapsulation of one melt by the other occurs in the runner system and formation of a sandwich structure in the cavity results. Annulus‐core injected configurations were only found to be stable when the lower‐viscosity melt is in the annular region.