Precise nanoinjection molding through local film heating system

Oh, Hwa Jin; Song, Young Seok

doi:10.1039/c5ra20206j

Cited by 23 publications

(9 citation statements)

References 25 publications

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“…The manufacturing process of the curved polymeric plates was simulated numerically. For it, governing equations are as below: 25 where ρ is the density, ṽ is the velocity vector, P is the pressure, is the viscous stress tensor, g̃ is the gravity/body-force vector, C p is the specific heat at constant pressure, β is the coefficient of thermal expansion, and q̃ is the heat flux. Since the polymer melt was regarded as a non-Newtonian viscous fluid in this study, the viscosity, η can be expressed using the following modified Cross model.…”

Section: Methodsmentioning

confidence: 99%

Surface analysis of curved polymeric plates irradiated with proton and ion beams

et al. 2018

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Section: Methodsmentioning

confidence: 99%

Surface analysis of curved polymeric plates irradiated with proton and ion beams

et al. 2018

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“…[5,14] In general, pattern structures, such as pattern size, shape, and aspect ratio, and molding conditions, such as melting temperature, mold temperature, injection pressure, and injection speed, affect the precision of replication. [15][16][17][18][19] Improved replication precision has been reported by adjusting molding methods such as rapid heating of mold surface, [20,21] vacuum molding, [22] and injection compression molding. [23,24] Polymer resin, a material used in injection molding, is injected into the mold by an injection molding machine resulting in solidification of the resin followed by rapid decrease in its flowability, which makes it difficult for it to fill the nanostructure of the nano-pattern.…”

Section: Introductionmentioning

confidence: 99%

Improvement in nano‐pattern replication of injection molding by polyamide/dendrimer blend

Kang

Kim

2021

Polymer Engineering & Sci

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In general, lower viscosity of materials leads to desirable nano‐pattern replication characteristics in injection molding processes. However, such materials do not meet the properties required for manufacturable products owing to their poor mechanical properties. In this study, we blended a small amount of dendrimer with high‐viscosity polyamide 6 to lower viscosity and enhance flowability of the polymer blend while maintaining desirable mechanical properties. It was observed that the flowability of the polyamide 6/dendrimer blend increased significantly with an increase in dendrimer content without affecting the mechanical properties of high‐viscosity polyamide 6. To investigate the nano‐pattern replication characteristics of the blend, injection molding process and the mold of metal stamp were used to manufacture a nano‐pattern specimen. Blending more than 0.6 wt% of dendrimer with high‐viscosity polyamide 6 significantly improved its nano‐pattern replication characteristics and flowability.

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“…Although some researchers have shared their definitions of micro-molded products, which will be Polymers 2021, 13, 2877 2 of 41 discussed later in this paper [1,[4][5][6][7][8], the size of the micro-molded parts is expected to exceed their definitions due to the continuous development of MIM. In fact, micro-molded parts have been gradually extending to sub-micron [9][10][11] or even nano-scale [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Tuning Power Ultrasound for Enhanced Performance of Thermoplastic Micro-Injection Molding: Principles, Methods, and Performances

Zhao

Qiang

et al. 2021

Polymers

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With the wide application of Micro-Electro-Mechanical Systems (MEMSs), especially the rapid development of wearable flexible electronics technology, the efficient production of micro-parts with thermoplastic polymers will be the core technology of the harvesting market. However, it is significantly restrained by the limitations of the traditional micro-injection-molding (MIM) process, such as replication fidelity, material utilization, and energy consumption. Currently, the increasing investigation has been focused on the ultrasonic-assisted micro-injection molding (UAMIM) and ultrasonic plasticization micro-injection molding (UPMIM), which has the advantages of new plasticization principle, high replication fidelity, and cost-effectiveness. The aim of this review is to present the latest research activities on the action mechanism of power ultrasound in various polymer micro-molding processes. At the beginning of this review, the physical changes, chemical changes, and morphological evolution mechanism of various thermoplastic polymers under different application modes of ultrasonic energy field are introduced. Subsequently, the process principles, characteristics, and latest developments of UAMIM and UPMIM are scientifically summarized. Particularly, some representative performance advantages of different polymers based on ultrasonic plasticization are further exemplified with a deeper understanding of polymer–MIM relationships. Finally, the challenges and opportunities of power ultrasound in MIM are prospected, such as the mechanism understanding and commercial application.

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Precise nanoinjection molding through local film heating system

Abstract: A new local film heating system (LFHS) can precisely control the local mold wall temperature in the nanoinjection molding process.

Cited by 23 publications

References 25 publications

Surface analysis of curved polymeric plates irradiated with proton and ion beams

Surface analysis of curved polymeric plates irradiated with proton and ion beams

Improvement in nano‐pattern replication of injection molding by polyamide/dendrimer blend

Tuning Power Ultrasound for Enhanced Performance of Thermoplastic Micro-Injection Molding: Principles, Methods, and Performances

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