A New Injection Molding Technology for Micro Parts

Michaeli, Walter; Spennemann, A.

doi:10.1515/polyeng.2001.21.2-3.87

Cited by 11 publications

(6 citation statements)

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“…Future enhancements for micro-injection moulding focuses on decreasing the sprue size and developing plastification units suitable for providing small amounts of melt using, for example, ultrasonic energy (Michaeli and Spennemann 2001;Michaeli et al 2002).…”

Section: Handling and Inspectionmentioning

confidence: 99%

Micro-injection moulding of polymer microfluidic devices

Attia

Marson

Alcock

2009

Microfluid Nanofluid

408

268

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Microfluidic devices have several applications in different fields, such as chemistry, medicine and biotechnology. Many research activities are currently investigating the manufacturing of integrated microfluidic devices on a mass-production scale with relatively low costs. This is especially important for applications where disposable devices are used for medical analysis. Micromoulding of thermoplastic polymers is a developing process with great potential for producing low-cost microfluidic devices. Among different micromoulding techniques, micro-injection moulding is one of the most promising processes suitable for manufacturing polymeric disposable microfluidic devices. This review paper aims at presenting the main significant developments that have been achieved in different aspects of micro-injection moulding of microfluidic devices. Aspects covered include device design, machine capabilities, mould manufacturing, material selection and process parameters. Problems, challenges and potential areas for research are highlighted.

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Section: Handling and Inspectionmentioning

confidence: 99%

Micro-injection moulding of polymer microfluidic devices

Attia

Marson

Alcock

2009

Microfluid Nanofluid

408

268

View full text Add to dashboard Cite

show abstract

“…In order to achieve a small injection volume (<1 mg), IKV (Institute für KunststoffVerarbeitung, Aachen, Germany) has prepared a small desktop-level micro-injection-molding machine that is only the size of a shoe box, in which 2 mm injection plungers, 5 mm metering plungers, TOOLVAC technology TM -have been used [ 101 ]. However, plasticization time has become a large proportion of the entire molding cycle due to the electric heating plasticization; hence, ultrasonic plasticization of trace polymers was investigated in order to improve the efficiency by Michaeli et al [ 19 ], and the molding process based on this kind of plasticization method is called UPMIM.…”

Section: Ultrasonic Plasticization Micro-injection Moldingmentioning

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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“…Mass production of miniaturized components still poses serious challenges to overcome in terms of precision manufacturing [1,2,3], but also offers great benefits in terms of production time and costs [4,5]. Micro injection molding (µIM) has shown enormous potential as a cost-effective technique to fabricate micro-components and/or meso-parts with intricate 3D features for various industrial applications [6,7].…”

Section: Introductionmentioning

confidence: 99%

Replication of Overmolded Orthopedic Implants with a Functionalized Thin Layer of Biodegradable Polymer

et al. 2018

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The present paper reports on the development of a biodegradable overmolded orthopedic implant: a metal bone fixing screw, which has been overmolded with a functionalized thin layer of biodegradable polymer to enhance cell adhesion during the healing process. The main challenges were to integrate precise, high-throughput and repeatable solutions to achieve a thin, defect-free structured polymer layer and to ensure a high and consistent implant quality. The work carried out entailed determining proper materials (Purasorb PDLG 5010) for the biodegradable overmolding layer and its economical substitute (NaKu PLA 100HF) to be used during initial tool and process development, designing the surface structure of the overmolded polymer layer, development of injection molding tools, as well as feeding and handling procedures. The injection overmolding process of Purasorb PDLG 5010 polymer was controlled, and the process parameters were optimized. In particular, the dominant process parameters for the overmolding, namely injection pressure, barrel temperature and mold temperature, were experimentally examined using a circumscribed three-factor central composite design and two quality marks; overmolding roughness and mass of polymer. The analysis of the experimental results shows that the mass of the overmolding is not feasible for use as the quality mark. However, the optimal parameters for the overmolding of a metallic implant screw with a thin, micro-structured polymer layer with a predefined roughness of the surface texture have been identified successfully.

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A New Injection Molding Technology for Micro Parts

Cited by 11 publications

References 0 publications

Micro-injection moulding of polymer microfluidic devices

Micro-injection moulding of polymer microfluidic devices

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

Replication of Overmolded Orthopedic Implants with a Functionalized Thin Layer of Biodegradable Polymer

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