scholarly journals Microcellular foam injection molding with cellulose nanofibers (CNFs)

2016 ◽  
Author(s):  
Masahiro Ohshima ◽  
Masaya Kubota ◽  
Shota Ishihara ◽  
Yuta Hikima ◽  
Akihiro Sato ◽  
...  
Keyword(s):  
Injection Molding ◽  
Cellulose Nanofibers ◽  
Microcellular Foam ◽  
Foam Injection Molding

Bubble morphological evolution and surface defect formation mechanism in the microcellular foam injection molding process

RSC Advances ◽  
2015 ◽  
Vol 5 (86) ◽  
pp. 70032-70050 ◽  
Author(s):  
Lei Zhang ◽  
Guoqun Zhao ◽  
Guiwei Dong ◽  
Shuai Li ◽  
Guilong Wang
Keyword(s):  
Injection Molding ◽  
Surface Defect ◽  
Defect Formation ◽  
Morphological Evolution ◽  
Injection Molding Process ◽  
Multiphase Model ◽  
Microcellular Foam ◽  
Molding Process ◽  
Foam Injection Molding ◽  
Surface Collapse

A multiphase model was established to simulate the bubble morphological evolution in MFIM, and a new phenomenon of surface collapse and pits with the gradient depth was discovered.

scholarly journals A Novel Hybrid Foaming Method for Low-Pressure Microcellular Foam Production of Unfilled and Talc-Filled Copolymer Polypropylenes

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1896 ◽  
Author(s):  
Llewelyn ◽  
Rees ◽  
Griffiths ◽  
Jacobi
Keyword(s):  
Injection Molding ◽  
Mechanical Characteristics ◽  
Low Pressure ◽  
Microcellular Foam ◽  
Foaming Agents ◽  
Blowing Agent ◽  
Weight Saving ◽  
Microcellular Foams ◽  
Foam Injection Molding ◽  
Foam Production

Unfilled and talc-filled Copolymer Polypropylene (PP) samples were produced through low-pressure foam-injection molding (FIM). The foaming stage of the process has been facilitated through a chemical blowing agent (C6H7NaO7 and CaCO3 mixture), a physical blowing agent (supercritical N2) and a novel hybrid foaming (combination of said chemical and physical foaming agents). Three weight-saving levels were produced with the varying foaming methods and compared to conventional injection molding. The unfilled PP foams produced through chemical blowing agent exhibited the strongest mechanical characteristics due to larger skin wall thicknesses, while the weakest were that of the talc-filled PP through the hybrid foaming technique. However, the hybrid foaming produced superior microcellular foams for both PPs due to calcium carbonate (CaCO3) enhancing the nucleation phase.

Research Progress of Improving Surface Quality of Microcellular Foam Injection Parts

2011 ◽  
Vol 66-68 ◽  
pp. 2010-2016 ◽  
Author(s):  
Yue Wang ◽  
Guang Hong Hu
Keyword(s):  
Injection Molding ◽  
Surface Quality ◽  
Dimensional Stability ◽  
Surface Defects ◽  
Research Progress ◽  
Microcellular Foam ◽  
Counter Pressure ◽  
Foam Injection Molding ◽  
Application Scope

Microcellular foam injection parts have many advantages such as saving material and energy, reducing cycle time, and processing excellent dimensional stability. Despite these advantages, the low surface quality problems limit its application scope seriously. In this study, the microcellular foam injection molding principle and some surface defects were introduced, and the technologies to improve surface quality, such as Gas Counter Pressure (GCP), Rapid Heat Cycle Molding (RHCM), and Film Insulation were summarized in detail. Finally, the prospect of CAE technologies about microcellular foam injection molding was proposed.

Investigation of Parameters Relevant to Microcellular Foam Injection Molding

2013 ◽  
Vol 785-786 ◽  
pp. 1041-1045 ◽  
Author(s):  
Luo Hong Deng ◽  
Zai Liang Chen ◽  
Fei Wang
Keyword(s):  
Injection Molding ◽  
Gas Content ◽  
Technological Parameters ◽  
Range Analysis ◽  
Microcellular Foam ◽  
Melt Temperature ◽  
Experiment Method ◽  
Molding Materials ◽  
Foam Injection Molding ◽  
Single Factor Experiment

The paper is proposed that we can use single factor experiment method and range analysis method to investigate four technological parameters (Melt temperature, Weight loss, Injection time and Gas content) of the technological parameters in the process of microcellular foam injection molding. By investigating the rules and degree which are obtained from the factors influence on bubbles morphology, it is actually meaningful that we can control and improve the bubbles morphology for improving the capability of Microcellular Foam Injection Molding materials.

scholarly journals About the numerous cost and processing advantages of the microcellular foam injection molding process for thermoplastics materials in the automobile industry

2015 ◽  
Vol 9 (2) ◽  
pp. 6-14
Author(s):  
Alexandru Oprea-Kiss ◽  
Imre Kiss
Keyword(s):  
Injection Molding ◽  
Automobile Industry ◽  
Dimensional Stability ◽  
Injection Molding Process ◽  
Microcellular Foam ◽  
Molding Process ◽  
Microcellular Injection Molding ◽  
And Performance ◽  
Plastic Parts ◽  
Foam Injection Molding

Today one of the goals of the automobile industry is to reduce weight. And physical foaming has already demonstrated its potential in this sector, improving the value and performance of applications under the bonnet: engine and gearbox cases, inlet air filters, cockpits, radiator baffles and so on. Around the world, the microcellular injection molding (MuCell) is used in thousands of applications in the automotive, packaging, technical molding, office machinery and electric and electronic component industries. The research opportunities purpose is to obtain even lighter pieces, with greater dimensional stability and with an excellent surface finish, in other words, perfect plastic parts. More component functionality with reduced weight, and cost control at the same time: MuCell is a process to physically foam thermoplastics, which combines technical and economic objectives. Besides weight reduction, it also provides improved dimensional stability of the moulded parts.

scholarly journals Shrinkage and Warpage Minimization of Glass-Fiber-Reinforced Polyamide 6 Parts by Microcellular Foam Injection Molding

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 889 ◽  
Author(s):  
Youngjae Ryu ◽  
Joo Seong Sohn ◽  
Chang-Seok Yun ◽  
Sung Woon Cha
Keyword(s):  
Injection Molding ◽  
Polyamide 6 ◽  
Injection Molding Process ◽  
Microcellular Foam ◽  
Molding Process ◽  
Glass Fiber Reinforced ◽  
Molded Parts ◽  
Injection Molded ◽  
Process Factors ◽  
Foam Injection Molding

Shrinkage and warpage of injection-molded parts can be minimized by applying microcellular foaming technology to the injection molding process. However, unlike the conventional injection molding process, the optimal conditions of the microcellular foam injection molding process are elusive because of core differences such as gas injection. Therefore, this study aims to derive process conditions to minimize the shrinkage and warpage of microcellular foam injection-molded parts made of glass fiber reinforced polyamide 6 (PA6/GF). Process factors and levels were first determined, with experiments planned accordingly. We simulated designed experiments using injection molding analysis software, and the results were analyzed using the Taguchi method, analysis of variance (ANOVA), and response surface methodology (RSM), with the ANOVA analysis being ultimately demonstrating the influence of the factors. We derived and verified the optimal combination of process factors and levels for minimizing both shrinkage and warpage using the Taguchi method and RSM. In addition, the mechanical properties and cell morphology of PA6/GF, which change with microcellular foam injection molding, were confirmed.

A new microcellular foam injection-molding technology using non-supercritical fluid physical blowing agents

2016 ◽  
Vol 57 (1) ◽  
pp. 105-113 ◽  
Author(s):  
Atsushi Yusa ◽  
Satoshi Yamamoto ◽  
Hideto Goto ◽  
Hiromasa Uezono ◽  
Fumiya Asaoka ◽  
...  
Keyword(s):  
Injection Molding ◽  
Supercritical Fluid ◽  
Microcellular Foam ◽  
Blowing Agents ◽  
Foam Injection Molding

Microcellular Foam Injection Molding of Thermoplastics Using Green Physical Blowing Agent

2016 ◽  
Vol 875 ◽  
pp. 77-111
Author(s):  
S.J.A. Rizvi
Keyword(s):  
Injection Molding ◽  
Membrane Separation ◽  
Batch Process ◽  
Injection Molding Process ◽  
Microcellular Foam ◽  
Molding Process ◽  
Blowing Agents ◽  
Carbon Dioxide Gas ◽  
Microcellular Injection Molding ◽  
Foam Injection Molding

The microcellular injection molding technology, commercially offered by Trexel Inc. and other manufacturers, is primarily a close cell foaming technique. This process is capable of offering light weight non-porous thermoplastics moldings. The foaming of thermoplastics with open cellular morphology has got various high end applications among others like tissue engineering and membrane separation. Some of the researchers were successful in synthesis of open cellular thermoplastics at laboratory scale via solid state batch process. The growing demand for microporous thermoplastics, especially the biodegradable plastics (e.g. Polylactic acid), motivated the researchers develop a specialized microcellular injection molding process for processing of open cell thermoplastics using physical blowing agents such as supercritical nitrogen or carbon dioxide gas. A brief of theoretical and conceptual treatment of microcellular injection molding is presented.

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