Observation of Two-Dimensional Shaped Aluminum Flake Orientation During Injection Molding and Its Orientation Mechanism

Park, Sang Hyun; Lyu, Min‐Young

doi:10.1007/s13233-019-7097-1

Cited by 11 publications

(7 citation statements)

References 20 publications

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Section: Resultsmentioning

confidence: 99%

“…A previous study on the normal flow region of aluminum flakes demonstrates that fractional flow causes aluminum flakes to move vertically from the core layer, and most of them are oriented parallel to the skin layer [34]; thus, the remaining fillers in the core layer are believed to have been affected by voids (Figure 6). A previous study on the normal flow region of aluminum flakes demonstrates that fractional flow causes aluminum flakes to move vertically from the core layer, and most of them are oriented parallel to the skin layer [34]; thus, the remaining fillers in the core layer are believed to have been affected by voids (Figure 6). A previous study on the normal flow region of aluminum flakes demonstrates that fractional flow causes aluminum flakes to move vertically from the core layer, and most of them are oriented parallel to the skin layer [34]; thus, the remaining fillers in the core layer are believed to have been affected by voids (Figure 6).…”

Section: Reflectance and Gloss Of Cim And Fimmentioning

confidence: 97%

Section: Reflectance and Gloss Of Cim And Fimmentioning

confidence: 97%

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Effect of Aluminum Flakes on Mechanical and Optical Properties of Foam Injection Molded Parts

et al. 2021

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Injection research using aluminum flakes has been conducted to realize metallic textures on the surface of plastic products. Several studies have focused on the effect of the orientation and quality of the flakes when using conventional injection molding methods; however, limited studies have focused on the foam injection molding method. In this study, we examined the orientation of aluminum flakes through foam injection with an inert gas and observed the changes in texture using a spectrophotometer and a gloss meter. The mechanical properties were also studied because the rigidity of the product, which is affected by the weight reduction that occurs during foaming, is an important factor. The results demonstrate that under foam injection molding, reflectance and gloss increased by 6% and 7 GU, respectively, compared to those obtained using conventional injection molding; furthermore, impact strength and flexural modulus increased by 62% and 15%, respectively. The results of this research can be applied to incorporate esthetic improvements to products and to develop functional parts.

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Section: Resultsmentioning

confidence: 99%

Section: Reflectance and Gloss Of Cim And Fimmentioning

confidence: 97%

Section: Reflectance and Gloss Of Cim And Fimmentioning

confidence: 97%

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Effect of Aluminum Flakes on Mechanical and Optical Properties of Foam Injection Molded Parts

et al. 2021

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“…24 The silver-white particles are Al flakes of varying degrees of inversion and their original shape and size remain unchanged after injection molding of the samples. 34 To further investigate the effect of scN 2 on the morphology of the Al flakes in the weld line region, the average aspect ratio and the projected area of Al flakes are measured. As shown in Figure 8, the average aspect ratio and projected area of Al flakes in the foamed part with scN 2 content of 0.2% was close to that of the solid sample.…”

Section: Effect Of N 2 Content On Weld Line Widthmentioning

confidence: 99%

Effect of supercritical nitrogen content on the weld lines and mechanical properties of microcellular injection molded double gate PP/Al parts

Li,

Zuo,

et al. 2023

J of Applied Polymer Sci

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Injection molding products made of aluminum flakes and polymer blends exhibit a distinctive esthetic effect. However, during the filling process, the melt flows in different directions converge and collide, resulting in the flop effect of the aluminum flake and consequent weld line formation. Herein, microcellular injection molding (MIM) was employed to fabricate polypropylene/aluminum flakes (PP/Al) composite foamed parts with distinct weld lines using supercritical nitrogen (scN2) as the physical blowing agent. The scN2 content has a significant effect on cell diameter and cell density. When the scN2 content was 0.6%, the weld line width of the foamed part was 13.03 μm, while it was 30.41 μm for the solid counterpart due to the expansion and rupture of cells in the flow front during filling. Moreover, the orientation of Al flakes was mostly along the flow direction for the foamed parts, while it was generally aligned perpendicular to the flow direction for solid parts in the weld line region. In addition, the flexural modulus of foamed parts was increased by 29% compared with the solid parts, although the tensile strength was reduced by 18% due to the alignment of Al flakes and the stress concentration on the cell walls. Therefore, this work provides insight into the improvement of flexural property and the mitigation of weld lines for injection molded composite parts using MIM.

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“…16–19 Furthermore, the fluid velocity in the cavity further decreases due to the solidified layer, so-called “skin layer.” On the other hand, the fluid flow in the cavity decelerates by means of the friction between the wall and the resin. 20–22 In this sense, it is not easy to manufacture ultra-thin plates by using injection molding.…”

Section: Introductionmentioning

confidence: 99%

Moldability improvement in microinjection molding via film lamination

Kim

Song

2021

Polymers and Polymer Composites

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The purpose of this study is to integrate a polymeric film onto a mold to impede thermal heat transfer during resin infusion. A thin plastic plate was fabricated by using microinjection molding. A polyimide (PI) film was laminated onto a mold in an effort to produce a thin light guide plate (LGP). The film could decelerate the solidification of molten polymer in the cavity of mold and enhance the wall slip of resin on the mold. The insulation effect was modeled numerically. The surface roughness and pattern transfer characteristics of the LGP were evaluated. It was found that the fluidity of the resin increased due to the decreased skin layer during mold filling. The results showed that the strategy proposed in this study could help decrease the thickness of LGP effectively when manufacturing the part via injection molding.

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Observation of Two-Dimensional Shaped Aluminum Flake Orientation During Injection Molding and Its Orientation Mechanism

Cited by 11 publications

References 20 publications

Effect of Aluminum Flakes on Mechanical and Optical Properties of Foam Injection Molded Parts

Effect of Aluminum Flakes on Mechanical and Optical Properties of Foam Injection Molded Parts

Effect of supercritical nitrogen content on the weld lines and mechanical properties of microcellular injection molded double gate PP/Al parts

Moldability improvement in microinjection molding via film lamination

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