A finite piece method for simulating polymer melt flows in extrusion sheet dies

Li, Yong; Zheng, Jinhua; Xia, Chunmin; Zhou, Wei

doi:10.1002/app.34979

Cited by 4 publications

(6 citation statements)

References 24 publications

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“…The substitution of Equations ( 10) and (11) in Equation (7) gives the following equation of the radius:…”

Section: Design Of the Manifold Curvementioning

confidence: 99%

“…Han and Wang [6] integrated a CFD simulation with a genetic algorithm for the optimization of velocity distribution and residence time of a tapered coat-hanger die. Lie et al [7] proposed a modified finite element method, namely finite piece method, for the simulation of a tapered coat-hanger die. Their method proved to save up to 80% of the CPU time.…”

Section: Introductionmentioning

confidence: 99%

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A Multi-Rheology Design Method of Sheeting Polymer Extrusion Dies Based on Flow Network and the Winter–Fritz Design Equation

et al. 2021

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In the polymer sheet processing industry, the primary objective when designing a coat-hanger die is to achieve a uniform velocity distribution at the exit of the extrusion die outlet. This velocity distribution depends on the internal flow channels of the die, rheological parameters and extrusion process conditions. As a result, coat-hanger dies are often designed for each polymer based on its individual rheological data and other conditions. A multi-rheology method based on a flow network model and the Winter–Fritz equation is proposed and implemented for the calculation, design and optimization of flat sheeting polymer extrusion dies. This method provides a fast and accurate algorithm to obtain die design geometries with constant wall-shear rates and optimal outlet velocity distributions. The geometric design when complemented and validated with fluid flow simulations could be applied for multi-rheological fluid models such as the power-law, Carreau–Yasuda and Cross. This method is applied to sheet dies with both circular- and rectangular-shaped manifolds for several rheological fluids. The designed geometrical parameters are obtained, and the associated fluid simulations are performed to demonstrate its favorable applicability without being limited to only the power-law rheology. The two such designed dies exhibit 32.9 and 21.5 percent improvement in flow uniformity compared to the previous methods for dies with circular and rectangular manifolds, respectively.

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“…The substitution of Equations ( 10) and (11) in Equation (7) gives the following equation of the radius:…”

Section: Design Of the Manifold Curvementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Multi-Rheology Design Method of Sheeting Polymer Extrusion Dies Based on Flow Network and the Winter–Fritz Design Equation

et al. 2021

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“…Groot et al [2] reduce design errors of blow molds by using a numerical method and computer aided manufacturing techniques to save development cycle and reduce costs. Li et al [3] simulated 3-D slit flows in extrusion sheet dies.…”

Section: Introductionmentioning

confidence: 99%

Numerical Optimization of the Parison Thickness of Oil Drum in Extrusion Blow Molding

Jian

Peng

Chen

et al. 2014

AMR

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The optimization parison thickness can reduce the oil drum weight and meet the requirement of the minimum thickness. The profile thickness of the extruded parison can be optimized by simulation. Under different blowing pressures, extrusion blow molding non-isothermal process of the high density polyethylene oil drum with a handle was simulated by using Polyflow. The initial parison was respectively divided into 11, 51, 101 and infinite segments. After seven optimizations, the oil drum wall thickness was equal or larger than 2 mm. An appropriate inflation pressure of 0.6 MPa was obtained. The results show that the production efficiency increases with the inflation pressure increasing. With the parison segments increasing, the oil drum thickness distribution inflated from the optimized parison is more uniform and approaches to the required thickness. The oil drum mass is decreased with the segments increasing. It is necessary that the non-uniform thickness parison was produced by injection molding.

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“…The finite piece method is kind of semi-analytical FEM. Li [7] succeeded in using this method to analyze the flow of PTT fluid in slab die. In the paper the finite piece method is adopted to solve space slit flow of K-BKZ fluid.…”

Section: Introductionmentioning

confidence: 99%

“…We postulate the pressure does not change along the thickness direction and create Cartesian coordinate system which the Z axis is the thickness direction of slit channel. For an incompressible fluid under isothermal, creeping flow conditions, the continuity equation and the motion equation are given by [7]:…”

mentioning

confidence: 99%

Application of the Finite Piece Method to Simulate Viscoelastic Fluid Flows in L-Shaped Channel

Zhou

2014

AMM

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The finite piece method is established to solve the flows of K-BKZ fluid in L-shaped channel. Numerical results are given to compare to the three-dimensional simulation using the finite element method (FEM). It is found that the results are highly consistent as a whole. The error of flow distribution is smaller than 2% at the outlet. There is a minor discrepancy of the pressure in the convergence region of channel but they are restricted to a small region. The present approach demonstrates its superiority over the conventional FEM for analyzing slit flow.

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A finite piece method for simulating polymer melt flows in extrusion sheet dies

Cited by 4 publications

References 24 publications

A Multi-Rheology Design Method of Sheeting Polymer Extrusion Dies Based on Flow Network and the Winter–Fritz Design Equation

A Multi-Rheology Design Method of Sheeting Polymer Extrusion Dies Based on Flow Network and the Winter–Fritz Design Equation

Numerical Optimization of the Parison Thickness of Oil Drum in Extrusion Blow Molding

Application of the Finite Piece Method to Simulate Viscoelastic Fluid Flows in L-Shaped Channel

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