scholarly journals Simulation of the Injection Stretch Blow Molding Process: An Anisotropic Visco‐Hyperelastic Model for Polyethylene Terephthalate Behavior

2020 ◽  
Vol 60 (4) ◽  
pp. 823-831 ◽  
Author(s):  
Yun‐Mei Luo ◽  
Luc Chevalier ◽  
Eric Monteiro ◽  
Shiyong Yan ◽  
Gary Menary
Keyword(s):  
Polyethylene Terephthalate ◽  
Molding Process ◽  
Blow Molding ◽  
Hyperelastic Model ◽  
Stretch Blow Molding

Experiment and Simulation of PET Stretch Blow Molding Process

2005 ◽  
Author(s):  
Ji-hu Liu ◽  
Han-Xiong Huang ◽  
Zhan-Song Yin
Keyword(s):  
Polyethylene Terephthalate ◽  
Viscoelastic Model ◽  
Great Influence ◽  
Time Sequence ◽  
Experimental Measurements ◽  
Molding Process ◽  
Blow Molding ◽  
Two Factors ◽  
Stretch Blow Molding ◽  
Good Agreement

This paper deals with various cases for PET (polyethylene terephthalate) in two-stage stretch blow molding process with a transparent mold and a digital camcorder. The simulations were carried out by POLYFLOW software with K-BKZ viscoelastic model. The predicted wall thickness distributions of the formed bottle were found to be in good agreement with those of experimental measurements. Under same reheating treatment, the two factors, both of the stretch rate and the time sequence of the rod movement and the gas blow, show more great influence on the thickness distributions of final bottle than blow pressure. Besides the three cases of the preform free blow, and the air pressure applied after/before the stretching rod touched the bottom of the mold cavity, the interaction of the two factors may cause another phenomenon, which is the stretching rod touches off the preform bottom after the rod pulls it for a moment. The phenomenon easily makes for an eccentricity of the bottle bottom.

scholarly journals STUDY OF DEFECT ON 180 ML HDPE BOTTLES YOGURT PRODUCTS WITH SMC B11 EXTRUSION BLOW MACHINE AT PT X

KREATOR ◽  
2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Tommy Prasetya Kana ◽  
Handika Dany Rahmayanti ◽  
HM Didik
Keyword(s):  
High Density Polyethylene ◽  
Plastic Material ◽  
Production Cycle ◽  
Molding Process ◽  
Plastic Packaging ◽  
Cycle Times ◽  
Blow Molding ◽  
Plastic Bottle ◽  
Extrusion Blow Molding ◽  
Stretch Blow Molding

The type of plastic packaging that is popular in the community is bottle packaging. The plastic material that is generally used to make plastic bottles is High Density Polyethylene (HDPE). The plastic bottle industry in Indonesia usually uses a blow molding process in its production process, where the blow molding process consists of injection blow molding, extrusion blow molding and stretch blow molding. The SMC B11 machine is one of the extrusion blow molding machines used to produce plastic bottle packaging. In producing workpieces, this machine still produces several products that are not in accordance with company standards, including in terms of production cycle times and product defects. Defects or defects that are often encountered include the appearance of spots, bent parison which causes the bottle to bend (the bottle body is thin one side) and blow pin which causes the thread to not fit.Keywords— Bottle, Plastic, Defect, Extrussion Blow Molding

scholarly journals Finite Element Analysis of PMMA Stretch Blow Molding

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Afef Bougharriou ◽  
Mohieddine Jeridi ◽  
Mohamed Hdiji ◽  
Anoir Boughrira ◽  
Kacem Saï
Keyword(s):  
Finite Element ◽  
Thickness Distribution ◽  
Geometrical Parameters ◽  
Molding Process ◽  
Element Analysis ◽  
Blow Molding ◽  
Stretch Blow Molding ◽  
Crucial Parameter

The electric bubbles are a useful product made of PMMA material. They are produced by the stretch blow molding process. Thickness, which reflects the quality of the electric bubble, is a crucial parameter that deserves special attention for the molding process. In this work, finite element simulations of the stretch blow molding process are performed aiming at the determination of the preform geometry to ensure homogeneous thickness of the finished product. The geometrical parameters of the preform are optimized allowing a better homogeneity thickness compared to existing data. The predicted parameters allow the improvement of the thickness distribution. The standard deviation of the thickness is reduced to about 95% compared to the existing bubble.

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.

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