Experimental investigation of the polymer melt flow during injection post-filling process

AIChE Journal ◽  
1995 ◽  
Vol 41 (12) ◽  
pp. 2661-2663
Author(s):  
N. T. Cheng ◽  
Y. C. Chen ◽  
S. C. Chen
Keyword(s):  
Experimental Investigation ◽  
Polymer Melt ◽  
Melt Flow ◽  
Filling Process

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

A New Implicit Finite Difference Algorithm of Thermal Melt Flow in Filling Process Based on Projection Method

2012 ◽  
Vol 9 (9) ◽  
pp. 1374-1378 ◽  
Author(s):  
Xiaofeng Niu ◽  
Wei Liang ◽  
Yuhong Zhao ◽  
Hua Hou ◽  
Yanqing Mu ◽  
...  
Keyword(s):  
Finite Difference ◽  
Projection Method ◽  
Melt Flow ◽  
Filling Process ◽  
Implicit Finite Difference

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.

Variational multi-scale finite element method for the two-phase flow of polymer melt filling process

2019 ◽  
Vol 30 (3) ◽  
pp. 1407-1426 ◽  
Author(s):  
Xuejuan Li ◽  
Ji-Huan He
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Method ◽  
Two Phase Flow ◽  
Polymer Melt ◽  
Phase Flow ◽  
Filling Process ◽  
Two Phase ◽  
Content Type ◽  
Element Method

Purpose The purpose of this paper is to develop an effective numerical algorithm for a gas-melt two-phase flow and use it to simulate a polymer melt filling process. Moreover, the suggested algorithm can deal with the moving interface and discontinuities of unknowns across the interface. Design/methodology/approach The algebraic sub-grid scales-variational multi-scale (ASGS-VMS) finite element method is used to solve the polymer melt filling process. Meanwhile, the time is discretized using the Crank–Nicolson-based split fractional step algorithm to reduce the computational time. The improved level set method is used to capture the melt front interface, and the related equations are discretized by the second-order Taylor–Galerkin scheme in space and the third-order total variation diminishing Runge–Kutta scheme in time. Findings The numerical method is validated by the benchmark problem. Moreover, the viscoelastic polymer melt filling process is investigated in a rectangular cavity. The front interface, pressure field and flow-induced stresses of polymer melt during the filling process are predicted. Overall, this paper presents a VMS method for polymer injection molding. The present numerical method is extremely suitable for two free surface problems. Originality/value For the first time ever, the ASGS-VMS finite element method is performed for the two-phase flow of polymer melt filling process, and an effective numerical method is designed to catch the moving surface.

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