Influence of the die entry angle on the entrance pressure drop, recoverable elastic energy, and onset of flow instability in polymer melt flow

1973 ◽  
Vol 17 (5) ◽  
pp. 1403-1413 ◽  
Author(s):  
Chang Dae Han
Keyword(s):  
Pressure Drop ◽  
Elastic Energy ◽  
Flow Instability ◽  
Polymer Melt ◽  
Melt Flow ◽  
Entry Angle ◽  
Entrance Pressure

Wall-Slip and Polymer-Melt Flow Instability

1996 ◽  
Vol 77 (5) ◽  
pp. 956-959 ◽  
Author(s):  
William B. Black ◽  
Michael D. Graham
Keyword(s):  
Flow Instability ◽  
Polymer Melt ◽  
Wall Slip ◽  
Melt Flow

Experimental and Computational Identification of a Polymer Melt Flow Instability

2008 ◽  
Author(s):  
David G. Hassell ◽  
Malcolm R. Mackley ◽  
Mehmet Sahin ◽  
Helen J. Wilson ◽  
Albert Co ◽  
...  
Keyword(s):  
Flow Instability ◽  
Polymer Melt ◽  
Melt Flow ◽  
Computational Identification

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

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.

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