C031 Detection of the Burn Mark on the Plastic Surface Using Image Analysis : Fundamental study for reduction the environmental impact by unpainted plastic products

Suda, Takafumi; Kuroiwa, Hiroki; Fukushima, Yoshio; Suzuki, Takashi; Terauchi, Fumio

doi:10.1299/jsmelem.2013.7.444

Cited by 2 publications

(1 citation statement)

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“…Another example is the porous mold inserts in plastic injection molding for gas escape to avoid flow lines, short shots, burn marks defects, etc. [6][7][8][9][10]. Among these applications, fluidity is critical inside the cellular parts.…”

Section: Introductionmentioning

confidence: 99%

Permeability of Additive Manufactured Cellular Structures—A Parametric Study on 17-4 PH Steels, Inconel 718, and Ti-6Al-4V Alloys

Liu

Cheng²,

Chiu³

et al. 2022

JMMP

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Cellular structures of metallic alloys are often made for various industrial applications by additive manufacturing. The permeability for fluid flow in these cellular structures is important. The current investigated the gas fluidity of cellular structures made by selective laser melting (SLM). The porosity and permeability of the SLM cellular structures were measured for 17-4 PH stainless steel, Inconel 718, and Ti-6Al-4V alloys. The relations between porosity and energy density are expressed using the power law. The characteristic molar energies were 1.07 × 105, 9.02 × 104, and 7.11 × 104 J/mole for 17-4 PH steel, Ti-6Al-4V, and Inconel 718 alloys, respectively. 17-4 PH steel gave rise to higher porosity at the same energy density when compared with Ti-6Al-4V and Inconel 718 alloy. The values of these molar energy density are related to the heat needed to melt the alloys, viscosity, and thermal conductivity. It was further shown that air permeability is not only concerned with the percentage of porosity in the cellular materials, but it also relates to the tortuosity of pore pathways formed in the cellular materials. At the same porosity, Inconel 718 demonstrates higher air permeability in comparison with that of Ti-6Al-4V and 17-4 PH alloys due to its smoother pore pathways. Ti-6Al-4V, on the other hand, demonstrates the highest specific surface areas due to powder sticking along the pore pathways and led to the lowest permeability among the three alloys.

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Section: Introductionmentioning

confidence: 99%

Permeability of Additive Manufactured Cellular Structures—A Parametric Study on 17-4 PH Steels, Inconel 718, and Ti-6Al-4V Alloys

Liu

Cheng²,

Chiu³

et al. 2022

JMMP

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Reducing the Burn Marks on Injection-Molded Parts by External Gas-Assisted Injection Molding

Liu

Xia

et al. 2021

Polymers

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A burn mark is a sort of serious surface defect on injection-molded parts. In some cases, it can be difficult to reduce the burn marks by traditional methods. In this study, external gas-assisted injection molding (EGAIM) was introduced to reduce the burn marks, as EGAIM has been reported to reduce the holding pressure. The parts with different severities of burn marks were produced by EGAIM and conventional injection molding (CIM) with the same molding parameters but different gas parameters. The burn marks were quantified by an image processing method and the quantitative method was introduced to discuss the influence of the gas parameters on burn marks. The results show that the burn marks can be eliminated by EGAIM without changing the structure of the part or the mold, and the severity of the burn marks changed from 4.98% with CIM to 0% with EGAIM. Additionally, the gas delay time is the most important gas parameter affecting the burn marks.

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C031 Detection of the Burn Mark on the Plastic Surface Using Image Analysis : Fundamental study for reduction the environmental impact by unpainted plastic products

Cited by 2 publications

References 0 publications

Permeability of Additive Manufactured Cellular Structures—A Parametric Study on 17-4 PH Steels, Inconel 718, and Ti-6Al-4V Alloys

Permeability of Additive Manufactured Cellular Structures—A Parametric Study on 17-4 PH Steels, Inconel 718, and Ti-6Al-4V Alloys

Reducing the Burn Marks on Injection-Molded Parts by External Gas-Assisted Injection Molding

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