scholarly journals Planar Extensional Viscosity Measurements for LDPE Polymer Melt by Using Novel Orifice Die Design and Cogswell Model

2011 ◽  
Author(s):  
Martin Zatloukal ◽  
Martin Zatloukal
Keyword(s):  
Polymer Melt ◽  
Extensional Viscosity ◽  
Die Design ◽  
Viscosity Measurements

A comparison of extensional viscosity measurements from various RME rheometers

2001 ◽  
Vol 40 (5) ◽  
pp. 457-466 ◽  
Author(s):  
Jonathan S. Schulze ◽  
Timothy P. Lodge ◽  
Christopher W. Macosko ◽  
Jens Hepperle ◽  
Helmut M�nstedt ◽  
...  
Keyword(s):  
Extensional Viscosity ◽  
Viscosity Measurements

3D FEM Study of the Flow Uniformity of Flat Polypropylene Film/Sheet Extrusion Dies

2020 ◽  
Vol 841 ◽  
pp. 375-380
Author(s):  
Dastan Igali ◽  
Asma Perveen ◽  
Dong Ming Wei ◽  
Di Chuan Zhang ◽  
Almagul Mentbayeva
Keyword(s):  
Polymer Melt ◽  
Die Design ◽  
Manufacturing Companies ◽  
Flow Uniformity ◽  
3D Fem ◽  
Extrusion Dies ◽  
Polypropylene Sheet ◽  
Flat Film ◽  
Extrusion Die Design ◽  
Sheet Extrusion

Coat-hanger dies are widely used in the extrusion of polymer sheets and films. However, when designing the flat film/sheet extrusion dies manufacturing companies still facing difficulties in achieving the flow uniformity of the polymer melt. This affects the product quality and tool life. This study examines the existing extrusion die design which is used in in the industry in Kazakhstan for polypropylene sheet production and proposes better geometry of a die. These die geometries will be tested for flow uniformity in terms of velocity and pressure at the outlet.

Effect of Die Lip Geometry on Polymer Extrudate Deformation in Complex Small Profile Extrusion

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Huiqing Tian ◽  
Danyang Zhao ◽  
Minjie Wang ◽  
Yifei Jin
Keyword(s):  
Three Dimensional ◽  
Polymer Melt ◽  
Quantitative Agreement ◽  
Geometric Parameters ◽  
Die Design ◽  
Wall Region ◽  
Thin Wall ◽  
Minor Variation ◽  
Global Deformation ◽  
A Minor

The extrusion of polymer profile products with complex microcross section is difficult due to the extrudate deformation, especially for the profile with multihollow lumens and inner ribs. In order to investigate the effect of die lip geometry on extrudate deformations, three-dimensional simulations have been undertaken for typical small profile extrusions both inside and outside the die using finite-element method (FEM). The Carreau model was used to describe the shear-thinning behavior of polymer melt. The systematic definitions of the die lip geometric parameters and evaluations of the extrudate deformations were proposed. It was found that the thickness and profile deformations happen asynchronously, and the existence of the inner rib changes the global deformation, which cannot be predicted by a deformation combination of the basic geometries. Among the investigated die lip geometric parameters, the wall thickness ratio has the most pronounced effect on both thickness and external profile deformations of the extrudates, with the maximum variation of more than 80%. The decrease of the hollow ratio significantly reduces the extrudate deformation extent, especially the extrudate external profile and the extrudate thickness of the thin-wall region. Even with uniform thickness, the location and shape of the inner rib also generate extrudate deformations not only on the inner rib but also on the thickness of the outer ring at the region not connected with it, by a minor variation level of 5–25%. Comprehensive understandings on the mechanism of extrudate deformations and effects of die lip geometry were obtained. Some hints for small profile die design were provided accordingly. Numerical results showed qualitative and quantitative agreement with the experiments.

Extensional viscosity measurements of dilute solutions of various polymers

1996 ◽  
Vol 65 (2-3) ◽  
pp. 291-298 ◽  
Author(s):  
Song L. Ng ◽  
Robert P. Mun ◽  
David V. Boger ◽  
David F. James
Keyword(s):  
Extensional Viscosity ◽  
Dilute Solutions ◽  
Viscosity Measurements

The application of shear and extensional viscosity measurements to assess the potential of hylan in viscosupplementation

Biorheology ◽  
1996 ◽  
Vol 33 (4-5) ◽  
pp. 319-332 ◽  
Author(s):  
S ALASSAF ◽  
J MEADOWS ◽  
G PHILLIPS ◽  
P WILLIAMS
Keyword(s):  
Extensional Viscosity ◽  
Viscosity Measurements

Extensional Viscosity Measurements for Low‐Viscosity Fluids

1987 ◽  
Vol 31 (3) ◽  
pp. 235-249 ◽  
Author(s):  
Gerald G. Fuller ◽  
Cheryl A. Cathey ◽  
Brent Hubbard ◽  
Beth E. Zebrowski
Keyword(s):  
Extensional Viscosity ◽  
Viscosity Measurements ◽  
Low Viscosity ◽  
Low Viscosity Fluids

scholarly journals Design of a Cross-Slot Flow Channel for Extensional Viscosity Measurements

2008 ◽  
Author(s):  
Manuel A. Alves ◽  
Albert Co ◽  
Gary L. Leal ◽  
Ralph H. Colby ◽  
A. Jeffrey Giacomin
Keyword(s):  
Flow Channel ◽  
Extensional Viscosity ◽  
Viscosity Measurements
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