TY - JOUR
T1 - Anisotropy and dimensions of blow‐molded polyethylene bottles
AU - Kamal, Musa R.
AU - Kalyon, Dilhan
AU - Tan, Victor
PY - 1982/4
Y1 - 1982/4
N2 - A commercial blow‐molding grade, high‐density polyethylene resin was employed to produce cylindrical bottles in a commercial reciprocating screw‐extrusion blow‐molding machine. The distributions of thickness, crystallinity, birefringence, and impact strength were obtained at various positions. The thickness is greatest near the parting lines, while minimum thickness occurs at the top and bottom of the bottle. The thickness tends to be uniform in the middle section, in agreement with earlier studies of the parison during processing. Density and crystallinity distributions are closely associated with the distribution of thickness and its effect on the cooling rates prevailing during molding. Frozen stresses and birefringence are largest at the outer surface, where cooling rates are highest. The impact strength is lowest near the parting line. Photomicrographs suggest that this is associated with internal flow and crystallization phenomena.
AB - A commercial blow‐molding grade, high‐density polyethylene resin was employed to produce cylindrical bottles in a commercial reciprocating screw‐extrusion blow‐molding machine. The distributions of thickness, crystallinity, birefringence, and impact strength were obtained at various positions. The thickness is greatest near the parting lines, while minimum thickness occurs at the top and bottom of the bottle. The thickness tends to be uniform in the middle section, in agreement with earlier studies of the parison during processing. Density and crystallinity distributions are closely associated with the distribution of thickness and its effect on the cooling rates prevailing during molding. Frozen stresses and birefringence are largest at the outer surface, where cooling rates are highest. The impact strength is lowest near the parting line. Photomicrographs suggest that this is associated with internal flow and crystallization phenomena.
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U2 - 10.1002/pen.760220504
DO - 10.1002/pen.760220504
M3 - Article
AN - SCOPUS:0020114140
SN - 0032-3888
VL - 22
SP - 287
EP - 291
JO - Polymer Engineering and Science
JF - Polymer Engineering and Science
IS - 5
ER -