Polymer melt flow and gas penetration in gasassisted injection molding of a thin part with gas channel design

1996 ◽  
Vol 39 (14) ◽  
pp. 2957-2968 ◽  
Author(s):  
Shia Chung Chen ◽  
Kuo Fu Hsu ◽  
Ke Sheng Hsu
Keyword(s):  
Injection Molding ◽  
Polymer Melt ◽  
Melt Flow ◽  
Channel Design ◽  
Gas Channel ◽  
Thin Part ◽  
Gas Penetration

scholarly journals Numerical Analysis for Polymer Melt Flow in Injection Molding.

1994 ◽  
Vol 37 (3) ◽  
pp. 531-537 ◽  
Author(s):  
Katsuhiko Sagae ◽  
Makoto Koizumi ◽  
Masanori Yamakawa
Keyword(s):  
Numerical Analysis ◽  
Injection Molding ◽  
Polymer Melt ◽  
Melt Flow

A Design for Spinning Die Channel of Melt-Blown Nonwoven Fabric

2011 ◽  
Vol 66-68 ◽  
pp. 922-926
Author(s):  
Ming Fu Yin ◽  
Xiao Qing Li ◽  
Hui Gong
Keyword(s):  
Polymer Melt ◽  
Nonwoven Fabric ◽  
Melt Flow ◽  
Design Requirement ◽  
Channel Design ◽  
Flow Process ◽  
Technological Requirement ◽  
Speed Distribution ◽  
Distribution Of Flow ◽  
Melt Blown Nonwoven

This paper has designed the T-channel, the fish-tail channel and the coat-hanger channel, and compared them separately. The conclusion has been obtained, which the coat-hanger channel conforms to the production technological requirement of melt-blown nonwoven fabric. In order to further confirm the coat-hanger channel design, the pressure and speed distribution of flow process which polymer melt flow in the channel have been simulated by ANSYS. The results indicated that the coat-hanger die channel conformed to the design requirement perfectly.

scholarly journals NUMERICAL INVESTIGATION OF THE POLYMER MELT FLOW IN INJECTION MOLDING BY USING ILU PRECONDITIONED GMRES

1999 ◽  
Vol 4 (1) ◽  
pp. 174-184
Author(s):  
U. Türk ◽  
A. Ecder
Keyword(s):  
Linear System ◽  
Injection Molding ◽  
Krylov Subspace ◽  
Polymer Melt ◽  
Computational Domain ◽  
Melt Flow ◽  
Polymer Flow ◽  
Non Linear ◽  
Energy Equations ◽  
Non Linear System

The implementation of a modern preconditioned Newton‐Krylov solvers to the polymer melt flow in injection molding is the main focus of this paper. The viscoelastic and non‐isothermal characteristics of the transient polymer flow is simulated numerically and the highly non‐linear problem solved. This non‐linear behavior results from the combination of the dominant convective terms and the dependence of the polymer viscosity to the changing temperature and the shear rate. The governing non‐Newtonian fluid flow and energy equations with appropriate approximations are discretized by finite differencing. Elliptic Grid Generation technique is used to map physical domain to computational domain. The resulting non‐linear system is solved by using Newton's method. GMRES, one of the Krylov subspace methods, used as an iterative algorithm in order to solve the linear system at each non‐linear step. Incomplete LU preconditioner is used for better convergence. Numerical solution of polymer flow is presented to demonstrate that these methods are efficient and robust for solving such flow problems.

SIMULATION FOR POLYMER MELT FLOW IN INJECTION MOLDING

1991 ◽  
pp. 569-572
Author(s):  
Katsuhiko SAGAE ◽  
Makoto KOIZUMI ◽  
Masanori YAMAKAWA
Keyword(s):  
Injection Molding ◽  
Polymer Melt ◽  
Melt Flow

scholarly journals Evaluation by nanoindentation of technological products manufactured by pulse injection molding process

2018 ◽  
Vol 145 ◽  
pp. 02006
Author(s):  
Margarita Natova ◽  
Ivan Ivanov ◽  
Sabina Cherneva ◽  
Maria Datcheva ◽  
Roumen Iankov
Keyword(s):  
Injection Molding ◽  
Polymer Melt ◽  
Injection Molding Process ◽  
Melt Flow ◽  
Molding Process ◽  
Polymer Injection ◽  
Pulse Injection ◽  
Molding Flow ◽  
Different Parts ◽  
Technological Products

During conventional polymer injection molding, flow- and weld lines can arise at the molded parts caused by disturbed polymer melt flow when it crosses different parts of the equipment. Such processed plastic goods have discrete zones of inhomogeneities of very small dimensions. In order to stabilize the melt flow and to equalize dimensions of such defective products, an approach for pulse injection molding is applied during production of polymer packagings. Testing methods used for evaluation of macromechanical performance of processed polymer products are not readily applicable to estimate the changes in visual surface obtained during pulse injecting. To overcome this testing inconvenience the performance of processed packagings is evaluated by nanoindentation. Using this method, a quantitative assessment of the polymer properties is obtained from different parts of technological products.

An Investigation into the Influencing Factors for Polymer Melt at the Filling Stage in Micro Injection Molding

2013 ◽  
Vol 562-565 ◽  
pp. 1380-1386
Author(s):  
Jian Zhuang ◽  
Da Ming Wu ◽  
Ya Jun Zhang ◽  
Lin Wang ◽  
Xiong Wei Wang ◽  
...  
Keyword(s):  
Injection Molding ◽  
Influencing Factors ◽  
Polymer Melt ◽  
Theoretical Models ◽  
Injection Molding Process ◽  
Melt Flow ◽  
Molding Process ◽  
Micro Injection Molding ◽  
Filling Stage ◽  
Conventional Injection Molding

The flow behaviors for polymer melt at the filling stage in micro injection molding are different from those in conventional injection molding due to the miniaturization of plastic parts. This paper focuses on the study of the effects of three main influencing factors, including the microscale viscosity and wall slip, on melt filling flow in microscale neglected those in conventional injection molding process. The theoretical models and the interrelation of these factors in microscale channels were constructed by means of the model correction method. Then, the micro melt flow behaviors were investigated with comparisons of the available experimental data. The results indicate that the dimensions affect the shear rates and viscous dissipation, which in turn affects the apparent viscosity. Finally, the conclusion is that the melt flow behaviors in microchannels are different from those in macrochannels owing to these significant influencing factors.

Study of polymer melt flow in sequential injection molding process

AIChE Journal ◽  
1996 ◽  
Vol 42 (6) ◽  
pp. 1706-1714 ◽  
Author(s):  
S. C. Chen ◽  
N. T. Chen ◽  
K. S. Hsu ◽  
K. F. Hsu
Keyword(s):  
Injection Molding ◽  
Polymer Melt ◽  
Injection Molding Process ◽  
Sequential Injection ◽  
Melt Flow ◽  
Molding Process

Numerical Simulation of Polymer Melt Flow Control for a Multi-Cavity Mold During Injection Molding Processes

2003 ◽  
Author(s):  
Ahmet Pinarbasi ◽  
Gregory S. Layser ◽  
John P. Coulter
Keyword(s):  
Numerical Simulation ◽  
Injection Molding ◽  
Flow Control ◽  
Polymer Melt ◽  
Volumetric Flow Rate ◽  
Melt Flow ◽  
Valve System ◽  
Control Concept ◽  
Flow Through ◽  
Plastic Parts

Process control is an important factor for improving the performance and consistency of thermoplastic parts manufactured by injection molding processes. A critical process parameter for manufacturing of high quality plastic parts is cavity pressure. This paper presents direct numerical simulation results of a new manufacturing concept developed to improve injection molding processing for all runner types by monitoring shot to shot product quality and controlling the filling of multi-cavity molds in real time. A cold runner system supplying polymer melt to a two-cavity mold incorporating mechanical valves in the runner systems was modeled. Each valve was controlled independently to meter flow and pressure to its portion of the mold. Simulations were performed for two different materials: PPS Ryton R-4-200 and LCP Vectra E130D-2. Shear-rate dependence of viscosity of the materials is modeled through the Cross rheological equation. Flow rates and maximum shear-rates through valves were calculated and the results of the simulations were analyzed to validate the concept of individual cavity filling modification. Flow through one valve system leading to a single cavity was simulated first, followed by flow through two-valve system for filling two cavities. For one valve simulations, pressure at the inlet was specified, whereas for flow through two-valve system, volumetric flow rate at the inlet was supplied for simulations. It was concluded that the flow control concept developed was numerically validated, and it was shown that the valve system proposed here is applicable to control melt flow through cavities at industrial manufacturing facilities. The future directions for the continuing project are also discussed.

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