scholarly journals Modeling morphology evolution during injection molding of thermoplastic polymers

2015 ◽  
Author(s):  
R. Pantani ◽  
F. De Santis ◽  
V. Speranza ◽  
G. Titomanlio
Keyword(s):  
Injection Molding ◽  
Morphology Evolution ◽  
Thermoplastic Polymers

Morphology Evolution during Injection Molding: effect of packing pressure

2007 ◽  
Author(s):  
R. Pantani ◽  
I. Coccorullo ◽  
V. Speranza ◽  
G. Titomanlio
Keyword(s):  
Injection Molding ◽  
Morphology Evolution ◽  
Packing Pressure

scholarly journals Multiscale Modeling and Simulation of Polymer Blends in Injection Molding: A Review

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3783
Author(s):  
Lin Deng ◽  
Suo Fan ◽  
Yun Zhang ◽  
Zhigao Huang ◽  
Huamin Zhou ◽  
...  
Keyword(s):  
Injection Molding ◽  
Modeling And Simulation ◽  
Polymer Blends ◽  
Multiscale Modeling ◽  
Technological Development ◽  
Future Research ◽  
Morphology Evolution ◽  
Immiscible Polymer Blends ◽  
Injection Molding Simulation ◽  
Pros And Cons

Modeling and simulation of the morphology evolution of immiscible polymer blends during injection molding is crucial for predicting and tailoring the products’ performance. This paper reviews the state-of-the-art progress in the multiscale modeling and simulation of injection molding of polymer blends. Technological development of the injection molding simulation on a macroscale was surveyed in detail. The aspects of various models for morphology evolution on a mesoscale during injection molding were discussed. The current scale-bridging strategies between macroscopic mold-filling flow and mesoscopic morphology evolution, as well as the pros and cons of the solutions, were analyzed and compared. Finally, a comprehensive summary of the above models is presented, along with the outlook for future research in this field.

scholarly journals A Novel Multiscale Methodology for Simulating Droplet Morphology Evolution during Injection Molding of Polymer Blends

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 133
Author(s):  
Lin Deng ◽  
Suo Fan ◽  
Yun Zhang ◽  
Zhigao Huang ◽  
Shaofei Jiang ◽  
...  
Keyword(s):  
Injection Molding ◽  
Polymer Blends ◽  
Critical Role ◽  
Pressure Sensors ◽  
Underlying Mechanism ◽  
Mold Filling ◽  
Morphology Evolution ◽  
Filling Process ◽  
Molded Parts ◽  
Droplet Morphology

The morphology of polymer blends plays a critical role in determining the properties of the blends and performance of resulting injection-molded parts. However, it is currently impossible to predict the morphology evolution during injection molding and the final micro-structure of the molded parts, as the existing models for the morphology evolution of polymer blends are still limited to a few simple flow fields. To fill this gap, this paper proposed a novel model for droplet morphology evolution during the mold filling process of polymer blends by coupling the models on macro- and meso-scales. The proposed model was verified by the injection molding experiment of PP/POE blends. The predicted curve of mold cavity pressure during filling process agreed precisely with the data of the corresponding pressure sensors. On the other hand, the model successfully tracked the moving trajectory and simulated morphology evolution of the droplets during the mold-filling process. After mold-filling ended, the simulation results of the final morphology of the droplets were consistent with the observations of the scanning electron microscope (SEM) experiment. Moreover, this study revealed the underlying mechanism of the droplet morphology evolution through the force analysis on the droplet. It is validated that the present model is a qualified tool for simulating the morphology evolution of polymer blends during injection molding and predicting the final microstructure of the products.

Morphology evolution and crystalline structure of controlled-rheology polypropylene in micro-injection molding

2015 ◽  
Vol 27 (4) ◽  
pp. 494-503 ◽  
Author(s):  
Mengjue Li ◽  
Yang Qi ◽  
Zhongguo Zhao ◽  
Zhang Xiang ◽  
Xia Liao ◽  
...  
Keyword(s):  
Injection Molding ◽  
Crystalline Structure ◽  
Morphology Evolution ◽  
Micro Injection Molding

Reaction Injection Molding

2006 ◽  
Author(s):  
Chang Dae Han
Keyword(s):  
Injection Molding ◽  
Cross Sections ◽  
Elevated Temperatures ◽  
Three Dimensional ◽  
Industrial Applications ◽  
Processing Temperature ◽  
Thermoplastic Polymers ◽  
Reaction Injection Molding ◽  
Rapid Injection ◽  
Sink Marks

Reaction injection molding (RIM) is a thermoset processing operation during which the incoming feedstream(s) undergo cure reactions that give rise to a three-dimensional network structure (Becker 1979; Macosko 1989). Different from the operation of injection molding thermoplastic polymers presented in Chapter 8, in RIM operation the component(s) must cure rapidly (say, within 90 seconds) and a finished product is removed in 1−10 minutes, depending on the chemical systems, the part thickness, and the capabilities of the processing machine. The chief advantages of RIM over the injection molding of thermoplastic polymers are: (1) large parts can be produced at low energy consumption, (2) large parts with varying cross sections with or without inserts can be produced without the problem of sink marks, and (3) lightweight parts, owing to the microcellular structure, can be produced. However, the predominant industrial applications are in the automotive industry; for instance, in the production of automobile fascia. In the 1970s and 1980s, very intensive research activities were reported on a better understanding of the RIM operation. Thermosets must meet with some stringent requirements for RIM operation. These are: (1) viscosities must be fairly low at processing temperature, so that a rapid injection of the feedstreams can be realized; (2) the feedstreams must have sufficient compatibility for efficient mixing by the static impingement mixing technique; (3) cure reaction must be sufficiently fast, such that a finished product can be removed in a very short time after injection is completed; (4) a finished product must have sufficient stiffness and resiliency at elevated temperatures; and (5) a finished product must be released easily from the mold surface, etc. It is then clear that not many thermosets meet these requirements. It has been found that urethanes, with proper chemistry of the components, meet with the requirements. For this reason, urethanes have been the most widely used resin for RIM, although other thermosets (e.g., epoxy) have also been used to some extent.

Morphology Evolution of Polymer Blends under Intense Shear During High Speed Thin-Wall Injection Molding

2017 ◽  
Vol 121 (25) ◽  
pp. 6257-6270 ◽  
Author(s):  
Yi Zhou ◽  
Feilong Yu ◽  
Hua Deng ◽  
Yajiang Huang ◽  
Guangxian Li ◽  
...  
Keyword(s):  
Injection Molding ◽  
Polymer Blends ◽  
High Speed ◽  
Morphology Evolution ◽  
Thin Wall ◽  
Wall Injection ◽  
Intense Shear
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