Experimental investigation and numerical simulation of liquid supported stretch blow molding

Abstract

An innovative production process for PET bottles ad containers is analyzed in this article. Liquid Bi‐Orientation (LBO) is a liquid supported stretch blow molding (SBM), which combines the separate blowing and filling phases of conventional SBM. The process modification is mainly characterized by forming the bottle using the desired liquid product instead of pressurized air. Consequently, possible improvements evolve regarding production cycle time, energy consumption and machine footprint. To make use of these capabilities, comprehensive process understanding is required, which can be increased using numerical simulation methods. Therefore, in this article, an LBO process model is set‐up and experimentally evaluated. The model explicitly considers the fluid‐structure interaction between liquid and PET, which significantly influences the PET forming behavior. The key simulation parameters namely the strong rate and temperature dependency of PET and a realistic process parameter determination are also included. The model is evaluated using two different methods to show the reliability of the process prediction. POLYM. ENG. SCI., 55:933–944, 2015. © 2014 Society of Plastics Engineers

In situ adjustment of a visco hyper elastic model for stretch blow molding process simulation of poly‐ethylene terephthalate bottles

“…iii. Zimmer et al 11 managed numerical simulation of the liquid-forming process (LF). The internal pressure in the bottle is due to the liquid devoted.…”

“…1,[7][8][9][10] As a consequence, the mechanical behavior of PET, which is strongly related to the microstructural morphology of the material changes: rigidity or strength are multiplied by two or three in regard of the characteristics of the preform. 9 Many researches [1][2][3][4][5][6][11][12][13][14][15][16][17][18][19] have been carried out to capture the PET behavior during the SBM process: the experimental research 2,[11][12][13] provides the data to assess the accuracy of the numerical simulation. [14][15][16][17][18][19] Understating the mechanical performance of bottle by an experimental approach is of high-cost and decreases the productivity.…”

“…Recently, Stephen et al 20 applied the meshfree method to simulate the SBM process. This method can lead to a stable and accurate numerical solution for SBM process. Zimmer et al 11 managed numerical simulation of the liquid‐forming process (LF). The internal pressure in the bottle is due to the liquid devoted. In SBM process, viscous dissipation during elongation has an effect on the evolution of the temperature and this phenomena call “self‐heating” needs to be taken into account in order to predict accurately the temperature distribution 18 .…”

Numerical modelling of heat transfer in a cavity due to liquid jet impingement for liquid supported stretch blow moulding

“…However, the presence of liquid as the forming medium introduces additional considerations; due to the increased density of the forming fluid versus air, gravity and inertial forces on the preform are no longer negligible, illustrated by Zimmer et al [3] in a numerical and experimental mechanical study. Heat transfer is also potentially increased, for if convection is considered to be the primary mode of heat transfer at the inner surface of the preform, liquid flowing over a solid has a much greater heat transfer coefficient than air.…”

The Effect of Selected Conditions in a Thermoforming Process on Wall Thickness Variations

“…This method is used in polymer processing primarily for measuring the temperature of both finished parts and processing tools [3,6,9,15,19]. The measurements were made using the V-20 II ER005-10 infrared camera from VIGO System S.A. and the Therm V 20 software.…”