Anisotropy and dimensions of blow‐molded polyethylene bottles

Musa R. Kamal, Dilhan Kalyon, Victor Tan

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)287-291
Number of pages5
JournalPolymer Engineering and Science
Volume22
Issue number5
DOIs
StatePublished - Apr 1982

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