Optimization of the Thickness of PET Bottles during Stretch Blow Molding by Using a Mesh-free (Numerical) Method

2009 ◽  
Vol 24 (3) ◽  
pp. 223-233 ◽  
Author(s):  
B. Cosson ◽  
L. Chevalier ◽  
J. Yvonnet
Keyword(s):  
Numerical Method ◽  
Pet Bottles ◽  
Blow Molding ◽  
Mesh Free ◽  
Stretch Blow Molding

scholarly journals Design and Analysis of Parison Blow Molding Using Adaptive Mesh

2021 ◽  
Vol 9 (VII) ◽  
pp. 1945-1950
Author(s):  
Syed Ayesha Yasmeen
Keyword(s):  
Transient Flow ◽  
Thickness Distribution ◽  
Numerical Data ◽  
Adaptive Mesh ◽  
Time Dependent ◽  
Molding Process ◽  
Pet Bottles ◽  
Blow Molding ◽  
Time Dependent Problem ◽  
Stretch Blow Molding

Blow Molding is one of the most versatile and economical process available for molding hollow materials. When polyethylene is stretched, it exhibits strain-hardening properties, which are temperature, pressure, velocity and strain-rate dependent. In this paper, preform is made by extrusion and forced between two halves by pressurization. This process includes isothermal and transient flow of Newtonian fluid in complex geometries simultaneous with structuring and solidification. A time dependent problem is defined and setting material properties and boundaries condition for bottle blow molding. Numerical data available in POLYDATA for a time dependent problem using ANSYS POLYFLOW were applied. Results display in form contours associated with different variables at different time steps and good agreement with the bottle thickness profile is observed. In this paper, the analysis of the stretch-blow molding (SBM) process of polyethylene terephthalate (PET), parison plastic bottles is studied by the finite element method (FEM). A hyper elastic constitutive behavior was calibrated using material data available in literature in variant high temperatures and strain rates and was used in the numerical simulation. Hydrostatic pressure with convention heat transfer has been used instead of a blowing process. Comparisons of numerical results with experimental observations demonstrate that the model can predict an overall trend of thickness distribution. Through the study, it becomes clear that the proposed model is applicable for simulating the stretch-blow molding process of PET bottles, and is capable of offering helpful knowledge in the production of bottles and the design of an optimum preform.

FSI-Simulation of Liquid Supported Stretch Blow Molding (LBO): Model Validation and Study of Series Production Scenario

2014 ◽  
Vol 611-612 ◽  
pp. 892-900
Author(s):  
Johannes Zimmer ◽  
Markus Stommel
Keyword(s):  
Process Model ◽  
Liquid Product ◽  
Pet Bottles ◽  
Blow Molding ◽  
New Process ◽  
Additional Challenge ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Stretch Blow Molding ◽  
Inertia Forces

Liquid-Driven Stretch Blow Molding is a new and innovative method to produce PET bottles [. In the well-established Stretch Blow Molding (SBM) process, preforms are biaxially deformed by pressurized air into a cavity. The resulting bottles are transferred to a separate machine, where the desired product is filled in. In contrast to that, Liquid-Driven Stretch Blow Molding is characterized by employing the liquid product to deform the material. The former separated blowing and filling steps are thus combined to a single forming stage leading to numerous advantages in energy consumption, cycle time and machine footprint. In this paper, a numerical simulation of the new process is presented. An additional challenge compared to SBM simulations is thereby the consideration of the interaction between liquid and preform. The load application cannot be solely represented by the pressure because the influx behavior as well as gravity and inertia forces influence the preform deformation. A smoothed particle hydrodynamics (SPH) approach is applied to the simulation to incorporate the additional effects. The process model is evaluated by prototype experiments. In addition, a feasibility study shows the applicability of a rotary forming system to the new process.

Numerical Study of Thickness Distribution of Stretch-Blow Bottles for Defects Prediction

2009 ◽  
Vol 413-414 ◽  
pp. 691-698 ◽  
Author(s):  
Ya Yue Pan ◽  
Shui Ying Zheng ◽  
Xiao Hong Pan
Keyword(s):  
Numerical Study ◽  
Thickness Distribution ◽  
Processing Parameters ◽  
Technological Parameters ◽  
Forming Process ◽  
Molding Process ◽  
Pet Bottles ◽  
Blow Molding ◽  
Stretch Blow Molding ◽  
Good Agreement

Nowadays, polyethylene terephthalate (PET) bottles have been increasingly used as drink containers. They are usually manufactured by a stretch-blow molding process. The improper parameters set in the stretch blow molding process may lead to many defects in the stretch-blow bottle. Finite Element (FE) simulations of the forming process were performed in this paper. The influences of the technological parameters, such as the balance between stretching and blowing rate, the movement of the stretch rod and the inflation pressure, were studied. As a result, the defects, such as over-thin area, cracking and deformation, can be predicted by this method. Especially, it is shown that the cracking in the bottom of products may result from the improper values of the dwell time and the stretch rate. The trends shown by the simulation results are in good agreement with the experimental results. The method can be applied to predict the probable defects, assess the structural properties, and optimize the processing parameters of the stretch blow molding process.

FEM-Based Research on Molding Parameter Analysis of the PET Beverage Bottle

2014 ◽  
Vol 488-489 ◽  
pp. 121-124
Author(s):  
Lu Yong Sun ◽  
Jin Long Zou ◽  
Kai Chen
Keyword(s):  
Thickness Distribution ◽  
Element Model ◽  
Parameter Analysis ◽  
Technological Parameters ◽  
Molding Process ◽  
Pet Bottles ◽  
Blow Molding ◽  
Molding Parameter ◽  
Stretch Blow Molding ◽  
Different Thickness

The researched PET beverage bottle molding process was analyzed with the combination of stretch blow molding technological process of the manufacturing enterprise. The molding results would be influenced by some technological parameters. In order to study the effect of these factors on the forming properties and thickness distribution of molding bottle, the article builds the physical model and finite element model of PET bottles stretch blow molding process, and simulates stretch blow molding process by using POLYFLOW software for analyzing the thickness distribution of molding bottle. Comparing different thickness distribution under the different condition of stretch speed, pre-blowing pressure, and blowing pressure, the technological parameters were optimized, so as to achieve the goal of optimization of molding bottle.

Biaxial deformation and experimental study of PET at conditions applicable to stretch blow molding

2011 ◽  
Vol 52 (3) ◽  
pp. 671-688 ◽  
Author(s):  
G.H. Menary ◽  
C.W. Tan ◽  
E.M.A. Harkin-Jones ◽  
C.G. Armstrong ◽  
P.J. Martin
Keyword(s):  
Experimental Study ◽  
Blow Molding ◽  
Biaxial Deformation ◽  
Stretch Blow Molding
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