The Experts below are selected from a list of 84 Experts worldwide ranked by ideXlab platform
Jean-yves Charmeau - One of the best experts on this subject based on the ideXlab platform.
-
Numerical simulation and optimization of the Injection Blow Molding of polypropylene bottles - a single stage process
International Journal of Material Forming, 2016Co-Authors: Jordan Biglione, Yves Bereaux, Jean-yves Charmeau, J. Balcaen, S. ChhayAbstract:Single stage Injection Blow Molding process, without preform storage and reheat, could be run on a standard Injection Molding machine, with the aim of producing short series of specific hollow parts. The polypropylene bottles are Blow molded right after being injected. This implies that the preform has to remain sufficiently malleable to be Blown while being viscous enough to avoid being pierced during the Blow Molding stage. These constraints lead to a small processing window, and so the process takes place between the melting temperature and the crystallization temperature, where the polypropylene is in its molten state but cool enough to enhance its viscosity without crystallizing. This single stage process introduces temperature gradients, high stretch rate and high cooling rate. Melt rheometry tests were performed to characterize the polymer behavior in the temperature range of the process, as well as Differential Scanning Calorimetry. A viscous Cross model is used with the thermal dependence assumed by an Arrhenius law. The process is simulated through a finite element code (POLYFLOW) in the ANSYS Workbench framework. The geometry allows an axisymmetric approach. The transient simulation is run under anisothermal conditions and viscous heating is taken into account. Sensitivity studies are carried out and reveal the influence of process parameters such as the material behavior, the Blowing pressure and the initial temperature field. Thickness measurements using image analysis are performed and the simulation results are compared to the experimental ones. The simulation shows broad agreements with the experimental results. An optimization loop is run to determine the optimal initial thickness repartition. Design points are defined along the preform and the optimization modifies the thickness at these locations.
-
Numerical Simulation of the Injection Blow Molding Single Stage Process: Shaping of Two Different Geometries and Comparison with Experimental Thickness Measurements
International Polymer Processing, 2016Co-Authors: Jordan Biglione, Yves Bereaux, Jean-yves CharmeauAbstract:Abstract Thanks to the single stage Injection Blow Molding process, specific hollow parts can be produced with standard Injection Molding machine. A specific mold is designed, enabling the preform Injection Molding, as well as its Blow Molding on the same machine. The preform is Blow molded right after its Injection Molding. This particular process does not involve preform storage and reheating before the Blow Molding stage. This implies that the preform has to remain sufficiently malleable to be Blown while being viscous enough to avoid being pierced during the Blow Molding stage. The polymer used is a polypropylene random copolymer. Therefore the process takes place between the melting temperature and the crystallization one. As the preform is Blow molded right after being injected, this single stage process involves high temperature before the Blowing. The polymer rheological behavior is investigated through dynamic rheometry in its molten state at various temperatures. A viscous Cross model is used wi...
Jordan Biglione - One of the best experts on this subject based on the ideXlab platform.
-
Numerical simulation and optimization of the Injection Blow Molding of polypropylene bottles - a single stage process
International Journal of Material Forming, 2016Co-Authors: Jordan Biglione, Yves Bereaux, Jean-yves Charmeau, J. Balcaen, S. ChhayAbstract:Single stage Injection Blow Molding process, without preform storage and reheat, could be run on a standard Injection Molding machine, with the aim of producing short series of specific hollow parts. The polypropylene bottles are Blow molded right after being injected. This implies that the preform has to remain sufficiently malleable to be Blown while being viscous enough to avoid being pierced during the Blow Molding stage. These constraints lead to a small processing window, and so the process takes place between the melting temperature and the crystallization temperature, where the polypropylene is in its molten state but cool enough to enhance its viscosity without crystallizing. This single stage process introduces temperature gradients, high stretch rate and high cooling rate. Melt rheometry tests were performed to characterize the polymer behavior in the temperature range of the process, as well as Differential Scanning Calorimetry. A viscous Cross model is used with the thermal dependence assumed by an Arrhenius law. The process is simulated through a finite element code (POLYFLOW) in the ANSYS Workbench framework. The geometry allows an axisymmetric approach. The transient simulation is run under anisothermal conditions and viscous heating is taken into account. Sensitivity studies are carried out and reveal the influence of process parameters such as the material behavior, the Blowing pressure and the initial temperature field. Thickness measurements using image analysis are performed and the simulation results are compared to the experimental ones. The simulation shows broad agreements with the experimental results. An optimization loop is run to determine the optimal initial thickness repartition. Design points are defined along the preform and the optimization modifies the thickness at these locations.
-
Numerical Simulation of the Injection Blow Molding Single Stage Process: Shaping of Two Different Geometries and Comparison with Experimental Thickness Measurements
International Polymer Processing, 2016Co-Authors: Jordan Biglione, Yves Bereaux, Jean-yves CharmeauAbstract:Abstract Thanks to the single stage Injection Blow Molding process, specific hollow parts can be produced with standard Injection Molding machine. A specific mold is designed, enabling the preform Injection Molding, as well as its Blow Molding on the same machine. The preform is Blow molded right after its Injection Molding. This particular process does not involve preform storage and reheating before the Blow Molding stage. This implies that the preform has to remain sufficiently malleable to be Blown while being viscous enough to avoid being pierced during the Blow Molding stage. The polymer used is a polypropylene random copolymer. Therefore the process takes place between the melting temperature and the crystallization one. As the preform is Blow molded right after being injected, this single stage process involves high temperature before the Blowing. The polymer rheological behavior is investigated through dynamic rheometry in its molten state at various temperatures. A viscous Cross model is used wi...
S. Chhay - One of the best experts on this subject based on the ideXlab platform.
-
Numerical simulation and optimization of the Injection Blow Molding of polypropylene bottles - a single stage process
International Journal of Material Forming, 2016Co-Authors: Jordan Biglione, Yves Bereaux, Jean-yves Charmeau, J. Balcaen, S. ChhayAbstract:Single stage Injection Blow Molding process, without preform storage and reheat, could be run on a standard Injection Molding machine, with the aim of producing short series of specific hollow parts. The polypropylene bottles are Blow molded right after being injected. This implies that the preform has to remain sufficiently malleable to be Blown while being viscous enough to avoid being pierced during the Blow Molding stage. These constraints lead to a small processing window, and so the process takes place between the melting temperature and the crystallization temperature, where the polypropylene is in its molten state but cool enough to enhance its viscosity without crystallizing. This single stage process introduces temperature gradients, high stretch rate and high cooling rate. Melt rheometry tests were performed to characterize the polymer behavior in the temperature range of the process, as well as Differential Scanning Calorimetry. A viscous Cross model is used with the thermal dependence assumed by an Arrhenius law. The process is simulated through a finite element code (POLYFLOW) in the ANSYS Workbench framework. The geometry allows an axisymmetric approach. The transient simulation is run under anisothermal conditions and viscous heating is taken into account. Sensitivity studies are carried out and reveal the influence of process parameters such as the material behavior, the Blowing pressure and the initial temperature field. Thickness measurements using image analysis are performed and the simulation results are compared to the experimental ones. The simulation shows broad agreements with the experimental results. An optimization loop is run to determine the optimal initial thickness repartition. Design points are defined along the preform and the optimization modifies the thickness at these locations.
Yves Bereaux - One of the best experts on this subject based on the ideXlab platform.
-
Numerical simulation and optimization of the Injection Blow Molding of polypropylene bottles - a single stage process
International Journal of Material Forming, 2016Co-Authors: Jordan Biglione, Yves Bereaux, Jean-yves Charmeau, J. Balcaen, S. ChhayAbstract:Single stage Injection Blow Molding process, without preform storage and reheat, could be run on a standard Injection Molding machine, with the aim of producing short series of specific hollow parts. The polypropylene bottles are Blow molded right after being injected. This implies that the preform has to remain sufficiently malleable to be Blown while being viscous enough to avoid being pierced during the Blow Molding stage. These constraints lead to a small processing window, and so the process takes place between the melting temperature and the crystallization temperature, where the polypropylene is in its molten state but cool enough to enhance its viscosity without crystallizing. This single stage process introduces temperature gradients, high stretch rate and high cooling rate. Melt rheometry tests were performed to characterize the polymer behavior in the temperature range of the process, as well as Differential Scanning Calorimetry. A viscous Cross model is used with the thermal dependence assumed by an Arrhenius law. The process is simulated through a finite element code (POLYFLOW) in the ANSYS Workbench framework. The geometry allows an axisymmetric approach. The transient simulation is run under anisothermal conditions and viscous heating is taken into account. Sensitivity studies are carried out and reveal the influence of process parameters such as the material behavior, the Blowing pressure and the initial temperature field. Thickness measurements using image analysis are performed and the simulation results are compared to the experimental ones. The simulation shows broad agreements with the experimental results. An optimization loop is run to determine the optimal initial thickness repartition. Design points are defined along the preform and the optimization modifies the thickness at these locations.
-
Numerical Simulation of the Injection Blow Molding Single Stage Process: Shaping of Two Different Geometries and Comparison with Experimental Thickness Measurements
International Polymer Processing, 2016Co-Authors: Jordan Biglione, Yves Bereaux, Jean-yves CharmeauAbstract:Abstract Thanks to the single stage Injection Blow Molding process, specific hollow parts can be produced with standard Injection Molding machine. A specific mold is designed, enabling the preform Injection Molding, as well as its Blow Molding on the same machine. The preform is Blow molded right after its Injection Molding. This particular process does not involve preform storage and reheating before the Blow Molding stage. This implies that the preform has to remain sufficiently malleable to be Blown while being viscous enough to avoid being pierced during the Blow Molding stage. The polymer used is a polypropylene random copolymer. Therefore the process takes place between the melting temperature and the crystallization one. As the preform is Blow molded right after being injected, this single stage process involves high temperature before the Blowing. The polymer rheological behavior is investigated through dynamic rheometry in its molten state at various temperatures. A viscous Cross model is used wi...
Satjarthip Thusneyapan - One of the best experts on this subject based on the ideXlab platform.
-
Finite-Element Analysis of Preform Deformation for Flat Wall Thickness Distribution in the Injection Blow Molding Process
Materials Science Forum, 2020Co-Authors: Nuchnalin Atigkaphan, Satjarthip ThusneyapanAbstract:The wall thickness of plastic bottle is a major consideration for engineers in designing products with strength. For Injection Blow Molding, the thickness depends on the preform size, and shape of the required product. The polyethylene terephthalate (PET) is injected in a mold with the shape of the preform. A stretch Injection Blow Molding machine is used for processing the preform to the shape of the bottle. This research applied finite-element analysis for the process simulation; started from applying the air pressure inside the heated perform – until the PET expanded to the required bottle shape. While most studies were interested in axis-symmetry shape, this paper concentrated on a bottle with uniform flat wall thickness on four sides of a squared section bottle. Several finite-element models were studied and compared the simulation efficiency. Under the investigated area of ±15 mm x 90 mm, the thickness deviation found to be within 3.573%.