Measurement and calculation of parison dimensions and bottle thickness distribution during blow molding

Musa R. Kamal, Victor Tan, Dilhan Kalyon

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Experimental data are reported regarding the dynamics of the blow molding process, including parison formation, growth, and inflation. These data have been obtained with the aid of high speed cinematography and pinch mold experiments, in conjunction with two commercial blow molding polyethylene resins. It is shown that pinch mold experiments alone do not yield accurate data regarding thickness and diameter swell. Furthermore, the inflation process involves decreasing rates of inflation with time, as a result of the rise in viscosity due to the cooling of the parison during inflation. Mathematical procedures are proposed for a first‐order estimation of parison length and swell as a function of time and the inflation behavior after clamping. In the absence of more dependable basic procedures, the proposed treatment is employed to estimate the effective transient swell functions for the parison using experimental data obtained under the specified conditions. The mathematical treatment is extended to determine the thickness distribution of the bottle. Good agreement is obtained between experimental and calculated results.

Original languageEnglish (US)
Pages (from-to)331-338
Number of pages8
JournalPolymer Engineering & Science
Volume21
Issue number6
DOIs
StatePublished - Jan 1 1981
Externally publishedYes

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Bottles
Blow molding
Polyethylene
Polyethylenes
Resins
Experiments
Viscosity
Cooling
Cinematography

All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Chemistry(all)
  • Polymers and Plastics

Cite this

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abstract = "Experimental data are reported regarding the dynamics of the blow molding process, including parison formation, growth, and inflation. These data have been obtained with the aid of high speed cinematography and pinch mold experiments, in conjunction with two commercial blow molding polyethylene resins. It is shown that pinch mold experiments alone do not yield accurate data regarding thickness and diameter swell. Furthermore, the inflation process involves decreasing rates of inflation with time, as a result of the rise in viscosity due to the cooling of the parison during inflation. Mathematical procedures are proposed for a first‐order estimation of parison length and swell as a function of time and the inflation behavior after clamping. In the absence of more dependable basic procedures, the proposed treatment is employed to estimate the effective transient swell functions for the parison using experimental data obtained under the specified conditions. The mathematical treatment is extended to determine the thickness distribution of the bottle. Good agreement is obtained between experimental and calculated results.",
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Measurement and calculation of parison dimensions and bottle thickness distribution during blow molding. / Kamal, Musa R.; Tan, Victor; Kalyon, Dilhan.

In: Polymer Engineering & Science, Vol. 21, No. 6, 01.01.1981, p. 331-338.

Research output: Contribution to journalArticle

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