Microinjection Molding ‐ Principles and Challenges

Ruprecht, R.; Finnah, G.; Piotter, V.

doi:10.1002/9783527616725.ch10

Cited by 5 publications

(6 citation statements)

References 37 publications

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“…In a variotherm process, the micropatterned‐mold inserts are heated to temperatures close to the melting points of the feedstocks in order to achieve complete filling of the microcavities, that is to prevent freezing of the feedstocks on the molding tool's wall due to a high‐temperature gradient and a large surface‐to‐volume ratio of microparts. The second step of the variotherm process is cooling down the tool after mold filling to a temperature that allows safe and defect‐free demolding 11 . Additionally, the adhesion of the components is also influenced by the post pressure.…”

Section: Basic Considerationsmentioning

confidence: 99%

“…The adhesion force formed at the interface between the two materials in the green body, however, depends on further injection parameters like tool temperature, temperatures of the hot runners, and the usage of variotherm process. 11 In a variotherm process, the micropatterned-mold inserts are heated to temperatures close to the melting points of the feedstocks in order to achieve complete filling of the microcavities, that is to prevent freezing of the feedstocks on the molding tool's wall due to a high-temperature gradient and a large surface-to-volume ratio of microparts. The second step of the variotherm process is cooling down the tool after mold filling to a temperature that allows safe and defect-free demolding.…”

Section: Basic Considerationsmentioning

confidence: 99%

“…The second step of the variotherm process is cooling down the tool after mold filling to a temperature that allows safe and defect-free demolding. 11 Additionally, the adhesion of the components is also influenced by the post pressure.…”

Section: Basic Considerationsmentioning

confidence: 99%

See 2 more Smart Citations

Development of Two-Component Micropowder Injection Molding (2C-MicroPIM)-Process Development

Ruh

Piotter

Plewa

et al. 2011

International Journal of Applied Ceramic Technology

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The increasing importance of two‐component microinjection molding is due to the potential to integrate different functionalities in one assembly without applying additional procedures. Furthermore, it enables a mass production technique of assemblies made up of two or more components. For mechanical advantages like toughness, hardness, or sufficient tribological behavior, metal or ceramic materials have to be used; the resulting process type is known as two‐component micropowder injection molding (2C‐MicroPIM). As this technology permits, in principle, the realization of fixed as well as movable junctions, a variety of new applications will be available. However, the two crucial aspects of 2C‐MicroPIM research are the selection of adequate materials and an optimized process development. This article describes the challenges and approaches of the process development. The feasibility of ceramic 2C‐MicroPIM assemblies has been demonstrated by a shaft‐to‐collar connection, which is composed by a zirconia gear wheel and a shaft made of alumina.

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Section: Basic Considerationsmentioning

confidence: 99%

Section: Basic Considerationsmentioning

confidence: 99%

See 1 more Smart Citation

Development of Two-Component Micropowder Injection Molding (2C-MicroPIM)-Process Development

Ruh

Piotter

Plewa

et al. 2011

International Journal of Applied Ceramic Technology

View full text Add to dashboard Cite

show abstract

“…The design of new molding apparatus is based on the 'variotherm' method that has been used in polymer injection molding [16]. The variotherm mold was initially developed in order to injection mold plastic micro parts or micro patterns with large surface-to-volume ratio [4]. It can also be adapted to µPIM.…”

Section: Mold Design and Fabricationmentioning

confidence: 99%

“…Further, high aspect ratio micro-structures (the aspect ratio of the micro-structure is the ratio of the height/length of the micro-structure to the width of the micro-structure [4]) are demanded in various applications. They include micro electromechanical systems (MEMS), microfluidic applications and biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

A micro powder injection molding apparatus for high aspect ratio metal micro-structure production

Tor

Loh

et al. 2007

J. Micromech. Microeng.

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A new variotherm molding apparatus is presented in this paper for the fabrication of high aspect ratio 316L stainless steel micro-structures using micro powder injection molding (μPIM) technology. The molding apparatus prototype includes an injection mold in which a silicon insert with an array of 24 × 24 (576) microcavities is mounted, a set of rapid tempering systems for the mold and a set of vacuum systems. The key advantage of this molding apparatus lies in the real-time monitoring and rapid adjustment of the mold cavity temperature during injection molding and part ejection, which makes molding and demolding of high aspect ratio green micro-structures possible. For example, incomplete filling occurs while injection molding micro-structures of 60 µm × height 191 µm with an aspect ratio of 3.2 using a conventional mold. In comparison, smaller micro-structures with higher aspect ratio are produced successfully in the case of the new molding apparatus, e.g. micro-structures of 40 µm × height 174 µm with an aspect ratio of 4.35 and 20 µm × height 160 µm with an aspect ratio of 8 were molded successfully.

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1.16 Net-Shape Microfabrication Technique by Micrometal Powder Injection Molding

Abdullahi

Nahar²,

Azuddin³

et al. 2017

Comprehensive Materials Finishing

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Microinjection Molding ‐ Principles and Challenges

Cited by 5 publications

References 37 publications

Development of Two-Component Micropowder Injection Molding (2C-MicroPIM)-Process Development

Development of Two-Component Micropowder Injection Molding (2C-MicroPIM)-Process Development

A micro powder injection molding apparatus for high aspect ratio metal micro-structure production

1.16 Net-Shape Microfabrication Technique by Micrometal Powder Injection Molding

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