Influence of relative low gas counter pressure on melt foaming behavior and surface quality of molded parts in microcellular injection molding process

Li, Shuai; Zhao, Guoqun; Wang, Guilong; Guan, Yanjin; Wang, Xiaoxin

doi:10.1177/0021955x14525961

Cited by 39 publications

(17 citation statements)

References 28 publications

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“…10 Complex medical instrument exterior shells with ideal cell morphology and surface quality can also be obtained by the microcellular injection molding process combined with gas counter pressure process. 11 Recently, supercritical carbon dioxide (scCO 2 ) has been gaining great emphasis in research and polymer processing industries. 12,13 In particular, scCO 2 represents an attractive alternative to ozone-depleting blowing agents as an environmentalfriendly and efficient physical-blowing agent for microcellular foaming applications.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and dielectric properties of microcellular polycarbonate foams with unimodal or bimodal cell-size distributions

Zhang

Yang

et al. 2014

Journal of Cellular Plastics

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This article reports on the compressive, dynamic mechanical and dielectric properties of microcellular polycarbonate foams with unimodal or bimodal cell-size distributions fabricated using the environment-friendly supercritical carbon dioxide. The effects of cell morphologies such as relative density, cell-size distribution and porosity on the compressive strength, Young's modulus, storage modulus, loss modulus, dielectric constant and loss tangent of the microcellular polycarbonate foams are investigated quantitatively. Experimental values of the compressive strength and Young's modulus fit very well with the theoretical values calculated from the Gibson-Ashby model at low relative densities. The higher relative density leads to higher storage modulus and loss modulus. The bimodal foams significantly improve the compressive and dynamic mechanical properties compared to the unimodal foams with the same relative density. The dielectric properties of microcellular foams depend only on the total porosity, but not on the cell-size distribution or microstructure of the foams. With increasing porosity, the dielectric constant of the microcellular foams gradually decreases, and agrees very well with the curve calculated from the Maxwell-Garnett-spheres model.

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Section: Introductionmentioning

confidence: 99%

Mechanical and dielectric properties of microcellular polycarbonate foams with unimodal or bimodal cell-size distributions

Zhang

Yang

et al. 2014

Journal of Cellular Plastics

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“…Shuai Li etc, did an analysis to describe the GCP effect on part surface quality [20] . He used a commercial grade HIPS (PH-888G) polymer as injection material.…”

Section: Gas Counter Pressurementioning

confidence: 99%

Microcellular Foam Injection Molding Surface Improvement Methods

Lu¹,

2016

Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016)

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“…RHCM/MIM was used to investigate the transient flow behavior of foam composites and formation mechanism of the surface defects [8][9][10]. Gas counter pressure (GCP) combined with MIM has been used to improve the surface quality of MIM products by controlling bubbles nucleation in the filling stage [11][12][13]. GCP is the way to inject high-pressure gas into the mold cavity before melt injection and keep a constant back pressure during the melt filling process.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Foamed PP/Nano-CaCO3 Composites in a Combined in-Mold Decoration and Microcellular Injection Molding Process

et al. 2020

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A combined in-mold decoration and microcellular injection molding (IMD/MIM) method has been used in this paper. The foamed PP/nano-CaCO3 composites were prepared to investigate their mechanical properties, cellular structure, and surface quality. The content of nano-CaCO3 varied from 0 to 10 wt %. The results showed that nano-CaCO3 acted as a reinforcing phase and nucleating agent, which help to improve the mechanical properties of foamed composites. The cellular structure and mechanical properties were optimum when the nano-CaCO3 content was 6 wt %. In the vertical section, the cell size and density of transition layer on the film side was bigger than that on the non-film side. In the parallel section, the cell ratio of length to diameter of transition layer on the film side was smaller than that on the non-film side, and the cell tile angle was larger than that on the non-film side. With nano-CaCO3 content increasing, the surface quality showed a trend of decreasing first and then increasing.

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Influence of relative low gas counter pressure on melt foaming behavior and surface quality of molded parts in microcellular injection molding process

Cited by 39 publications

References 28 publications

Mechanical and dielectric properties of microcellular polycarbonate foams with unimodal or bimodal cell-size distributions

Mechanical and dielectric properties of microcellular polycarbonate foams with unimodal or bimodal cell-size distributions

Microcellular Foam Injection Molding Surface Improvement Methods

Investigation on Foamed PP/Nano-CaCO3 Composites in a Combined in-Mold Decoration and Microcellular Injection Molding Process

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