Identification of cell‐nucleation mechanism in foam injection molding with gas‐counter pressure via mold visualization

Shaayegan, Vahid; Mark, Lun Howe; Park, Chul; Wang, Guilong

doi:10.1002/aic.15433

Cited by 26 publications

(15 citation statements)

References 54 publications

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“…Within the study Polystyrene (PS) in combination with CO 2 were used. [53][54][55][56] The processing variables of injection speed, flow resistance of the gate, content of the blowing agent, melt flow rate and addition of talc were investigated. It was concluded that the injection speed and the resistance of the gate did not affect the resulting cell density whilst the dissolved gas content within the polymer melt affect cell density.…”

Section: Cell Structurementioning

confidence: 99%

Advances in microcellular injection moulding

Llewelyn

Rees

Griffiths

et al. 2020

Journal of Cellular Plastics

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Injection moulding is a well-established replication process for the cost-effective manufacture of polymer-based components. The process has different applications in fields such as medical, automotive and aerospace. To expand the use of polymers to meet growing consumer demands for increased functionality, advanced injection moulding processes have been developed that modifies the polymer to create microcellular structures. Through the creation of microcellular materials, additional functionality can be gained through polymer component weight and processing energy reduction. Microcellular injection moulding shows high potential in creating innovation green manufacturing platforms. This review article aims to present the significant developments that have been achieved in different aspects of microcellular injection moulding. Aspects covered include core-back, gas counter pressure, variable thermal tool moulding and other advanced technologies. The resulting characteristics of creating microcellular injection moulding components through both plasticising agents and nucleating agents are presented. In addition, the article highlights potential areas for research exploitation. In particular, acoustic and thermal applications, nano-cellular injection moulding parts and developments of more accurate simulations.

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Section: Cell Structurementioning

confidence: 99%

Advances in microcellular injection moulding

Llewelyn

Rees

Griffiths

et al. 2020

Journal of Cellular Plastics

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show abstract

“…Therefore, in this process, the magnitude of the external force has a great influence on the melt pressure, that is, the higher the applied force, the greater the pressure of the polymer melt. When the external force is removed, the pressure drop rate increases, and the system quickly reaches the thermodynamic instability state, which leads to a rapid rise in cell number and a short time for cell stabilization, thus improving the efficiency of cell formation [ 32 , 33 ]. According to formula (1), with the increase in melt pressure, Δ G decreased obviously ( Table 5 ).…”

Section: Resultsmentioning

confidence: 99%

In-Situ Visualization of the Cell Formation Process of Foamed Polypropylene under Different Foaming Environments

et al. 2021

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In this paper, the dynamic foaming process of micro-foaming polypropylene (PP) in different foaming environments in real time was obtained via a visualization device. The relationship curve between cell number (n) and foaming time (t) was plotted, and then the nucleation kinetics of foam cells was analyzed. Results showed that the formation rate of cells changed obviously with the variation of melt temperature and the content of the foaming agent. The n-t curves presented a typical “S” shape, which indicated that the appearance of the cell number increased slowly in the initial foaming period, then increased rapidly in a short time, and finally maintained a certain value. When a certain pressure was applied to the PP melt, the external force had a great influence on the n-t curve. With the increasing external force, the rate of cell formation increased rapidly, and the shape of the n-t curve changed from “S” to “semi-S” without an obvious slow increase. The investigation of the n-t relationship in the PP dynamic foaming process under different foaming environments could provide effective bases for improving the foaming quality of injection molding foaming materials.

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“…Except the above solutions, GCP technology 26–28 has been proved to be an effective method to solve the gas mark defects of FIM parts. Wu et al.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the forming and evolution process of cell structure in gas counter pressure assisted chemical foaming injection molded parts

Sun

Wang

et al. 2020

Journal of Cellular Plastics

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By using a standard stretch spline as the research object, the influence of gas counter pressure (GCP) technology on melt foaming behavior in chemical foaming injection molding (CFIM) process was investigated. Related experimental line for GCP assisted CFIM foam was designed, and the effect of GCP technology on melt flow front, spline surface quality and internal cell was studied. According to the results obtained from the experiment, two critical GCP pressures and one critical GCP holding time were innovation proposed. Two critical GCP pressures are the critical GCP pressure of melt flow front cell not cracking and the critical GCP pressure of melt not foaming, respectively. The critical GCP holding time is the secondary foaming behavior time. Based on the proposed critical GCP pressures and critical GCP holding time, the influence mechanism of GCP technology on melt foaming action during CFIM process was revealed.

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Identification of cell‐nucleation mechanism in foam injection molding with gas‐counter pressure via mold visualization

Cited by 26 publications

References 54 publications

Advances in microcellular injection moulding

Advances in microcellular injection moulding

In-Situ Visualization of the Cell Formation Process of Foamed Polypropylene under Different Foaming Environments

Experimental investigation on the forming and evolution process of cell structure in gas counter pressure assisted chemical foaming injection molded parts

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