Effect of mold opening on microcellular polyether-ether-ketone fabricated by injection molding

Yang, Jing‐hui; Xie, Jun; Ji, Kaipeng; WANG, Xianghong; Jiao, Xiaolong; Zhi-nong, XU; Zhao, Peng

doi:10.1016/j.jmrt.2022.05.146

Cited by 12 publications

(5 citation statements)

References 42 publications

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“…The 3D surface profiles of solid and foamed gear samples were characterized using a white‐light interferometer and the results were illustrated in Figure 6. It was found that the solid injection molded samples exhibit smoother surface appearances than the foamed parts, with few appearance defects on the surface 33 . However, the surface appearance was still not flattened enough with many hollows distributed on the local surface, as illustrated in Figure 6a,c.…”

Section: Resultsmentioning

confidence: 98%

“…It was found that the solid injection molded samples exhibit smoother surface appearances than the foamed parts, with few appearance defects on the surface. 33 However, the surface appearance was still not flattened enough with many hollows distributed on the local surface, as illustrated in Figure 6a,c. Compared to the solid injection molded gears, 3D surface profiles of the foamed gears became more complicated.…”

Section: D Surface Profilesmentioning

confidence: 98%

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Microcellular injection molding of foamed engineering plastic parts with high dimensional accuracy

Feng

Zhan

et al. 2023

J of Applied Polymer Sci

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Polyformaldehyde (POM) and Polyamide 66 (PA66) are engineering plastics with excellent mechanical properties and thermal stability. Producing microcellular injection molded POM and PA66 parts with high dimensional accuracy would be beneficial to reduce material cost and product quality. In this research, foamed POM and PA66 gear parts were fabricated by using microcellular injection molding with supercritical nitrogen as the blowing agent. Compared to conventional injection molded parts (parts that foaming is not involved), the foamed POM and PA66 gear parts achieved 5% and 10% average weight reduction, respectively. The foamed parts displayed a lower shrinkage ratio when compared to the solid counterparts, which was attributed to the cell expansion that offset part of the inward shrinkage stress. Moreover, POM gear parts with a higher crystallinity degree presented more serious shrinkage ratio compared to the PA66 gear parts, which contributed to the denser polymer molecular chains arrangement. The shrinkage ratio in both directions of PA66 foamed gear parts depended on the injection volume, and the lowest shrinkage ratio of 0.043‰ was obtained at the injection volume of 74 mm, when the polymer reached the maximum foaming ratio. The findings from this study could provide practical guidance for preparing microcellular injection molded products with high dimensional accuracy.

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Section: Resultsmentioning

confidence: 98%

Section: D Surface Profilesmentioning

confidence: 98%

Microcellular injection molding of foamed engineering plastic parts with high dimensional accuracy

Feng

Zhan

et al. 2023

J of Applied Polymer Sci

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“…The cell distribution gradually widens, and the foaming quality deteriorates. For Group A, the growth of cells was greatly limited when the core‐back distance was small, resulting in smaller cell size 23 . The hindrance to cell growth decreased with increasing core‐back distance so that the cell size gradually increased and the cell density gradually decreased 24 .…”

Section: Resultsmentioning

confidence: 99%

“…For Group A, the growth of cells was greatly limited when the core-back distance was small, resulting in smaller cell size. 23 The hindrance to cell growth decreased with increasing core-back distance so that the cell size gradually increased and the cell density gradually decreased. 24 Under Group B (Figure 3), as the weight reduction level increases (10%-30%), the average cell sizes initially decreased and then increased, while the cell density initially increased and then decreased.…”

Section: Cell Morphology Of the Pp-ifr Flame Retardant Foams Under Di...mentioning

confidence: 99%

Effect of foaming behavior of polypropylene foams on flame retardant properties under different weight reduction methods

Li,

Luo,

Liu

et al. 2024

J of Applied Polymer Sci

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In previous studies, the effect of cell structures of polypropylene (PP) foam materials on flammability behavior had been largely overlooked. In this work, ammonium polyphosphate and pentaerythritol were used as intumescent flame retardants (IFR) for PP, and then the PP‐IFR flame retardant foams were prepared by using injection foaming technology with two different weight reduction methods (same mold volume before foaming and after foaming). The results showed that the average cell size of all the PP‐IFR flame retardant foams in the 10% to 30% weight reduction was less than 100 μm. The PP‐IFR flame retardant foams with an average cell diameter of 26.22 μm and cell density of 7.88 × 106 cells/cm3 had the best limiting oxygen index (LOI) of 27.9%. In addition, the PP‐IFR flame retardant foams with better foaming quality had a higher LOI and a denser foam carbon layer whatever the weight reduction methods, resulting in better flame retardant properties. The escape of gases from the foamed and un‐foamed areas not only reduced the concentration of flammable gases but also led to the collapse and rupture of the foam carbon layer during the combustion process. Hence, it provides guidance for preparing PP foam materials with excellent flame retardancy.

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“…The use of the microcellular molding technique ensures that carbon fiber-enhanced polypropylene composites achieve high electrical and mechanical performance [130]. MIM technology reduces product weight and energy consumption [131]. MIM products are a frequent subject of research to optimize the process and obtain products with desired properties.…”

Section: Microcellular Injection Moldingmentioning

confidence: 99%

Advanced Injection Molding Methods: Review

Czepiel,

Bańkosz,

Sobczak-Kupiec

2023

Materials

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Injection molding is a method commonly used to manufacture plastic products. This technology makes it possible to obtain products of specially designed shape and size. In addition, the developed mold allows for repeated and repeatable production of selected plastic parts. Over the years, this technology grew in importance, and nowadays, products produced by injection molding are used in almost every field of industry. This paper is a review and provides information on recent research reports in the field of modern injection molding techniques. Selected plastics most commonly processed by this technique are discussed. Next, the chosen types of this technique are presented, along with a discussion of the parameters that affect performance and process flow. Depending on the proposed method, the influence of various factors on the quality and yield of the obtained products was analyzed. Nowadays, the link between these two properties is extremely important. The work presented in the article refers to research aimed at modifying injection molding methods enabling high product quality with high productivity at the same time. An important role is also played by lowering production costs and reducing the negative impact on the environment. The review discusses modern injection molding technologies, the development of which is constantly progressing. Finally, the impact of the technology on the ecological environment is discussed and the perspectives of the process were presented.

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Effect of mold opening on microcellular polyether-ether-ketone fabricated by injection molding

Cited by 12 publications

References 42 publications

Microcellular injection molding of foamed engineering plastic parts with high dimensional accuracy

Microcellular injection molding of foamed engineering plastic parts with high dimensional accuracy

Effect of foaming behavior of polypropylene foams on flame retardant properties under different weight reduction methods

Advanced Injection Molding Methods: Review

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