Abstract
This study carries the numerical effort for the investigation of effect of preform length on the final product wall thickness distribution. For the investigation, three different preform length cases were taken under consideration. Preform A, preform B and preform C of length 144.75mm, 165.7mm and 186.65mm respectively. All the preforms were stretched up to a same critical point respect to mold length so that the axial deformation during blowing was fair for all the preform cases. Blowing conditions were the same for all cases. The stretching period for each case was set in accordance to the to the limit of critical stretching point. The mass of all preform cases was 58.33grams. It was found that preform B and C result in more uniform thickness distribution. The optimum results are given by preform C, since the resulting product appears the less spots with excess usage of raw material. The heavier bottle bottom region resulting from preform C enhances the steadiness of the bottle.
Highlights
Injection Stretch Blow Molding process is a widely used fabrication technique for the production of hollow plastic containers [1], [2] [3] [4] [5] [6] [7], [8]
For the simulation three preform case were taken under consideration
All the cases were stretched up to the same axial location respect to the mold length in an effort to eliminate the effect of the axial deformation during the blowing process since the preform cases have different length
Summary
Injection Stretch Blow Molding process is a widely used fabrication technique for the production of hollow plastic containers [1], [2] [3] [4] [5] [6] [7], [8]. The preform is similar to a test tube Both stretching and blowing take place in a mold, which has the shape of the desired bottle/container. One of the most crucial parameters in Stretch Blow Molding (SBM) is the temperature distribution along the preform length. The numerical results obtained using the non-isothermal model were closer to the experimental SBM During both simulations and experiments the final temperature distribution is slightly higher than the initial temperature distribution due to energy dissipation during SBM. The commercial simulation package POLYFLOW has been implemented in another study for the investigation of blowing pressure and stretch rod velocity on the final thickness distribution along the surface of a 680ml PET bottle [13]. The highest the percentage of crystals in the materi highest is the strength [18]
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