A comprehensive 3-D analysis of polymer melt flow in slit extrusion dies

2004 ◽  
Vol 23 (2) ◽  
pp. 111-124 ◽  
Author(s):  
Yihan Huang ◽  
C. Richard Gentle ◽  
J. Barry Hull
Keyword(s):  
Polymer Melt ◽  
Melt Flow ◽  
Extrusion Dies

Conjugate transport in polymer melt flow through extrusion dies

1997 ◽  
Vol 37 (9) ◽  
pp. 1582-1595 ◽  
Author(s):  
P. Lin ◽  
Y. Jaluria
Keyword(s):  
Polymer Melt ◽  
Melt Flow ◽  
Extrusion Dies ◽  
Flow Through

POLYMER MELT FLOW IN ASYMMETRIC SUDDEN EXPANSIONS: A NUMERICAL STUDY

2016 ◽  
Author(s):  
Felipe Oliveira Basso ◽  
Paulo Zdanski ◽  
Diego Beppler ◽  
Miguel Vaz Jr.
Keyword(s):  
Numerical Study ◽  
Polymer Melt ◽  
Melt Flow

scholarly journals Determination of an Extrusion Machine Performance Based on the Working Field of the Extruder Die

2021 ◽  
Vol 58 (3) ◽  
pp. 217-230
Author(s):  
Valeriu V. Jinescu ◽  
Mihail Juganaru ◽  
Cosmin Jinescu ◽  
Nicoleta Sporea
Keyword(s):  
Polymer Melt ◽  
Ethylene Vinyl Acetate ◽  
Heating System ◽  
Maximum Output ◽  
Economic Output ◽  
Extrusion Dies ◽  
Machine Performance ◽  
Extrusion Die ◽  
Short Service Life ◽  
Extruded Product

Some inventions along with theoretical and experimental research made it possible to increase the output of a thermally homogeneous melt provided by the screw. However, the quality of the extruded product depends on some specific features of the extrusion die and to a large extent on the rheological behavior (viscous and elastic) of the polymer melt. The mismatch between the design of the screw-cylinder subassembly and the design of the extrusion die results in products with relatively short service life. The present paper has drawn up the working field of the extruder die and adjusted it based on the limitations imposed by the screw-cylinder subassembly, namely: - the maximum output rate that ensures the required thermal homogeneity of the melt; - the maximum output at which the heating system on the barrel (and possibly the screw) ensures the extrusion temperature; - the minimum economic output corresponding to the diameter of the screw. The working field of some extrusion dies for blown films of the following polymers have been plotted: polypropylene, low density polyethylene, high density polyethylene and ethylene vinyl acetate.

Polymer Melt Flow through Channels with Vibrating Walls

2002 ◽  
Vol 230-232 ◽  
pp. 300-302 ◽  
Author(s):  
M. Martins ◽  
José A. Covas
Keyword(s):  
Polymer Melt ◽  
Melt Flow ◽  
Flow Through

Modeling and Characterization to Minimize Effects of Melt Flow Fronts on Premolded Component Deformation During In-Mold Assembly of Mesoscale Revolute Joints

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
A. Ananthanarayanan ◽  
S. K. Gupta ◽  
H. A. Bruck
Keyword(s):  
Plastic Deformation ◽  
High Speed ◽  
Polymer Melt ◽  
Production Costs ◽  
Melt Flow ◽  
Flow Front ◽  
Melting Temperatures ◽  
Second Stage ◽  
Revolute Joints ◽  
Front Position

In-mold assembly can be used to create mesoscale articulating polymeric joints that enable the miniaturization of devices, reduction in production costs, and increase in throughput. One of the major challenges in miniaturizing devices using the in-mold assembly is to develop appropriate characterization techniques and modeling approaches for the interaction between polymer melt flow fronts and premolded components. When a high speed, high temperature second stage melt comes in contact with a premolded mesoscale component that has similar melting temperatures, the premolded component can experience a significant plastic deformation due to the thermal softening and the force associated with impingement of the melt flow front. In our previous work, we developed methods to inhibit the plastic deformation by supporting the ends of the mesoscale premolded components. In this paper, we present an alternative strategy for controlling premolded component deformations. This involves a mesoscale in-mold assembly strategy that has a multigate mold design for bidirectional filling. This strategy permits in-mold assembly using polymers with comparable melting points. This paper demonstrates the technical feasibility of manufacturing in-mold-assembled mesoscale revolute joints using this bidirectional filling strategy. An experimental technique was developed for characterizing the transient impact force of the melt flow front on premolded components inside of a mold. The experimental data were used to validate a new computational model for predicting the effects of the melt flow front position in order to minimize the plastic deformation of premolded component using the bidirectional filling strategy. This paper also investigates the effects of the flow front position on the force applied on the premolded component and its corresponding plastic deformation.

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.

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