The effect of the deformation rate on the wall thickness of 1.5LT PET bottle during ISBM (Injection Stretch Blow Molding) process

Abstract

The biaxial orientation of deformation during the ISBM process forms the final desired volume of the plastic container. The ISBM process comprises stretching and blowing of a preheated preform inside a mold for the formation of a beverage container. The current study deals with the numerical investigation of the effect of deformation rate on the final bottle thickness wall distribution. It was considered that the stretching rod velocity varies from 0.6-0.8m/s and the preblowing pressure from 0.4-1.6MPa. Additionally, the advantage of stretching versus free blow conditions is being discussed. It was found that highest is the stretching velocity, the higher is the resulting material concentration at the base of the bottle. Additionally, it was found that the higher preblowing pressure accumulates thick material at the central region of the bottle while the upper and bottom regions of the bottle get thinner.