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Influence of mold design on the mechanical properties of high‐pressure injection—molded polyethylene
Author(s) -
Kubáut J.,
Månson J.A.,
Rigdahl M.
Publication year - 1983
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.760231604
Subject(s) - materials science , mold , composite material , ultimate tensile strength , modulus , molding (decorative) , stiffness , young's modulus , polyethylene , high density polyethylene
High‐pressure injection molding (nominal pressure 500 MPa) is known to substantially improve the mechanical properties of high‐density polyethylene of a high molecular weight (HMWPE). This work shows that if the mold is equipped with an exit cavity, the tensile modulus and strength of HMWPE‐bars molded is further improved at high pressure levels. The maximum values of the stiffness and strength (thin bars, 1 mm) obtained with the exit chamber is about 12 GPa and 260 MPa, respectively. The improvement due to the exit cavity is of the order of 30 percent for the tensile strength for thicknesses lower than 4mm, while the modulus increases about 1 to 1.5 GPa for bars with thicknesses between 1 and 6 mm. The orientation of the melt during the filling of the mold was also found to have an influence on the mechanical properties of the HMWPE bars.