Nonisothermal comprehensive 3D analysis of polymer melt flow in a coat‐hanger die

Wu, Tingqi; Jiang, Bo; Xu, Sheng; Bi, Chuan‐Xing

doi:10.1002/pen.20419

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…Velocity is calculated based on the method given by Kim [17].Velocity and temperature profiles are adapted from Wei and Michaeli [5,18,19]. In this method, velocity is given as follows: (9) where:…”

Section: Inflow Boundary Conditionmentioning

confidence: 99%

“…Huang et al [8] analyzed flow distribution of polymer melt in the coat-hanger extrusion die for the purpose of understanding flow behavior, such as dead spots in the die cavity. Wu et al [9] also studied the flow and temperature fields of the coat-hanger die. They concluded that the highest temperature, which is important for temperature-sensitive polymers, occurs at the center of the manifold.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Polymer Extrusion Die Based on Response Surface Method

et al. 2020

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A coupled surface response optimization method with a three-dimensional finite volume method is adopted in this study to identify five independent geometric variables of the die interior that provides a design with the lowest velocity variance at the exit of the coat-hanger extrusion die. Two of these five geometric variables represent the manifold dimension while the other three variables represent the die profile. In this method, B-spline fitting with four points was used to represent the die profile. A comparison of the optimized die obtained in our study and the die with a geometry derived by a previous theoretical work shows a 20.07% improvement in the velocity distribution at the exit of the die.

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Section: Inflow Boundary Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of Polymer Extrusion Die Based on Response Surface Method

et al. 2020

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“…At the border area of the manifold and the slot, the denser meshes are used because of the abrupt change in the geometry. In the simulation the nonslip boundary condition14–16 is applied on the die wall for the three velocity components. At the symmetry plane, zero x‐component velocity and zero surface traction in y and z directions are imposed.…”

Section: Introductionmentioning

confidence: 99%

Optimal geometry design of the coat‐hanger die with uniform outlet velocity and minimal residence time

Wan-jin

Wang

2011

J of Applied Polymer Sci

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In this article a method combining the orthogonal array design and the numerical simulation is used to optimize the geometry parameters of the coathanger die with uniform outlet velocity and minimal residence time. The outlet velocity and the residence time are obtained by simulating the three-dimensional nonisothermal polymer flow in the coat-hanger die, while the optimal geometry design is accomplished via the orthogonal array method. The effects of the manifold angle, the land height and the slot gap on the outlet velocity and the residence time are investigated. The results show that the effects of all the three parameters are significant for the outlet velocity. For the residence time, the manifold angle and the slot gap are the significant factors, while the effect of the land height is insignificant. The optimal geometry parameters of the coat-hanger die achieved in this study are that the manifold angle is 5, the height land is 70 mm, and the slot gap is 3 mm.

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“…The derived equation was based on an average momentum and mass balance within the cavity. Wu et al10 studied the nonisothermal flow of Carreau fluid in the coat‐hanger die. The isobars, the isotherms, and the velocity distribution were obtained as well.…”

Section: Introductionmentioning

confidence: 99%

Modeling of coat‐hanger die under vibrational extrusion

Qu¹,

Zhang²

2007

J of Applied Polymer Sci

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The distributions of the pulsatile pressure field, the pulsatile velocity field, and the pulsatile resident time of the polymeric melt in the coat-hanger die are derived by using the pulsation of volumetric flow rate and pressure. Subsequently, formulae of the manifold radius and the slope of the manifold are deduced via volumetric flow rate pulsation. Polypropylene (PP) was employed for the experiments of the vibrational extrusion. The results indicate that the average extrusion pressure declines with frequency or amplitude decreasing; the distribution of residence time along the width of the coat-hanger die performs uniformly during the vibrational extrusion process; the theoretical extrusion pressure well agrees with the experimental pressure; the experiments of tensile test, impact test implicate that vibration improves the mechanical properties of products; differential scanning calorimetry testing demonstrates that the melting point of PP is moved to a higher temperature value, and the endothermic enthalpy and the crystallinity are improved as well when superimposing the vibrational force field. Accordingly, the model of the coat-hanger die under vibrational extrusion is well consistent with the experiments.

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Nonisothermal comprehensive 3D analysis of polymer melt flow in a coat‐hanger die

Cited by 11 publications

References 20 publications

Optimization of Polymer Extrusion Die Based on Response Surface Method

Optimization of Polymer Extrusion Die Based on Response Surface Method

Optimal geometry design of the coat‐hanger die with uniform outlet velocity and minimal residence time

Modeling of coat‐hanger die under vibrational extrusion

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