Integral approach for production of thermoplastics microparts by injection moulding

Zhiltsova, Tatiana; Oliveira, Mónica; Ferreira, J. A.

doi:10.1007/s10853-012-6669-7

Cited by 17 publications

(19 citation statements)

References 107 publications

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“…The polycarbonate plate was fabricated using an injectionmoulding technique that allowed the molten polycarbonate to fill a mould cavity where the mirror-image stamper of the plate was placed. 22,23 The polycarbonate plate was then retrieved and used for the experiments after quality inspection.…”

Section: Adhesive Fabricationmentioning

confidence: 99%

Gecko-inspired chitosan adhesive for tissue repair

et al. 2016

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The advent of nanotechnology has opened the possibility of fabricating nanoscopic pillars on the surface of polymeric films mimicking the Gecko's foot, in an attempt to increase their adhesive capabilities enhanced by van der Waals forces. However, these forces are considerably weakened in a wet physiological environment. To circumvent this loss in force, current biocompatible adhesives with nanopillars require complex multiple-step fabrication, including an extra layer of adhesive coating to stabilize tissue bonding under physiological conditions. In this report, we describe a simple one-step fabrication process of a single-layer chitosan film that has pillars with base diameter in the range of 100-600 nm and a height of~70 nm. The nanostructured adhesive is laser-bonded to tissue and does not require pillar coating to enhance bonding in water. In comparison with a 'flat' adhesive (without pillars), the nanostructured adhesive bonded significantly stronger to tissue under either stress or pressure. Atomic force spectroscopy also confirmed the superior bonding capability of the nanostructured adhesive. This study demonstrates a one-step fabrication technique to produce a monolayer gecko-inspired adhesive that is biocompatible and bonds effectively to tissue.

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Section: Adhesive Fabricationmentioning

confidence: 99%

Gecko-inspired chitosan adhesive for tissue repair

et al. 2016

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“…First, tight tolerances claim good warpage control. Moreover, it often relies on the variotherm process control where cooling and heating phases alternate in accordance to the injection cycle in order to improve part quality [4,6].…”

Section: Cooling and Mold Blockmentioning

confidence: 99%

Advancements on the Simulation of the Micro Injection Moulding Process

Marhöfer¹,

Tosello²,

Hansen³

et al. 2013

Proceedings of the 10th International Conference on Multi-Material Micro Manufacture

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“…Compared to conventional injection molding, MIM is capable of more precise microfeature replication due to its having a more precise electrical control system compared to the hydraulic system of conventional injection molding. However, due to the miniaturised features and thinner mold cavity, the micro injection molding process has major challenges including significantly higher shear rates during filling, and more difficult filling due to faster heat loss resulting in premature solidification of polymer melt [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Several methods have been proposed as methods to improve nano/micro feature replication, such as using variotherm (or rapid thermal cycling) and vacuum venting method [1][2][3]7].…”

Section: Introductionmentioning

confidence: 99%

“…Vacuum venting has been used as a way to improve feature replication in both conventional and micro injection molding [1][2][3]. Inadequate venting in conventional injection molding has caused some common defects such as short-shot, poor appearance, burn marks and even permanent mold damage, and it is believed that the defects could be accentuated in MIM since the process involves high injection velocity and pressure, and rapid cooling [1][2][3]8].…”

Section: Introductionmentioning

confidence: 99%

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Vacuum Venting Enhances the Replication of Nano/Microfeatures in Micro-Injection Molding Process

Choi

Zhang

Toner

et al. 2016

Journal of Micro and Nano-Manufacturing

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Vacuum venting is a method proposed to improve feature replication in microparts that are fabricated using micro-injection molding (MIM). A qualitative and quantitative study has been carried out to investigate the effect of vacuum venting on the nano/microfeature replication in MIM. Anodized aluminum oxide (AAO) containing nanofeatures and a bulk metallic glass (BMG) tool mold containing microfeatures were used as mold inserts. The effect of vacuum pressure at constant vacuum time, and of vacuum time at constant vacuum pressure on the replication of these features is investigated. It is found that vacuum venting qualitatively enhances the nanoscale feature definition as well as increases the area of feature replication. In the quantitative study, higher aspect ratio (AR) features can be replicated more effectively using vacuum venting. Increasing both vacuum pressure and vacuum time are found to improve the depth of replication, with the vacuum pressure having more influence. Feature orientation and final sample shape could affect the absolute depth of replication of a particular feature within the sample.

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Integral approach for production of thermoplastics microparts by injection moulding

Cited by 17 publications

References 107 publications

Gecko-inspired chitosan adhesive for tissue repair

Gecko-inspired chitosan adhesive for tissue repair

Advancements on the Simulation of the Micro Injection Moulding Process

Vacuum Venting Enhances the Replication of Nano/Microfeatures in Micro-Injection Molding Process

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