Replication of micro and nano surface geometries

Hansen, Hans Nørgaard; Hocken, Robert J.; Tosello, Guido

doi:10.1016/j.cirp.2011.05.008

Cited by 165 publications

(103 citation statements)

References 104 publications

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“…In µ-IM, higher mould temperatures can be adopted to improve moulding performance and for very demanding microfeatures and structures, mould temperatures are set to be higher than the T g of the polymer, which increases the filling ratio significantly, and has a favourable effect on the replication of microstructures [10,11]. During the cooling stage of the IM process polymer materials experience volume variations when they undergo temperature changes, these variations are a result of the polymer pressure-volume-temperature (pvT) behaviour.…”

Section: The Effects Of Process Conditions On Part Demouldingmentioning

confidence: 99%

Characterisation of demoulding parameters in micro-injection moulding

et al. 2014

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Condition monitoring of micro injection moulding is an effective way of understanding the processing effects of variable parameter settings. This paper reports an experimental study that investigates the characteristics of the demoulding behaviour in micro injection moulding (µ-IM) with a focus on the process factors that affect parts' quality. Using a Cyclic Olefin Copolyme (COC) microfluidics demonstrator, the demoulding performance was studied as a function of four process parameters (melt temperature, mould temperature, holding pressure and injection speed), employing the design of experiment approach. The results provide empirical evidences on the effect that processing parameters have on demoulding conditions in µ-IM, and identifies combinations of parameters that can be used to achieve the optimal processing conditions in regards to demoulding behaviour of micro parts. It was concluded that there was a direct correlation between the applied pressure during part filling, holding phases and the demoulding characteristic factors of the µ-IM cycle such as ejection force, integral and time.2

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Section: The Effects Of Process Conditions On Part Demouldingmentioning

confidence: 99%

Characterisation of demoulding parameters in micro-injection moulding

et al. 2014

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“…A mould temperature of 90°C was set following the recommendations from the material supplier, in order to allow successful demoulding of the part from the cavity, to perform the injection process within a suitable cycle time (i.e. short cooling time), and maximize surface replication [15]. An actual injection speed of 200 mm/s was used, taking into account the machine capability.…”

Section: Injection Mouldingmentioning

confidence: 99%

“…surface replication), and tool wear conditions as experienced in production. For these reasons, a melt temperature of 295°C was selected close the maximum recommended from the material supplier in order to avoid polymer overheating and subsequent material degradation, which could compromise the optical performance of the lens, and to optimize polymer surface replication [15]. A mould temperature of 90°C was set following the recommendations from the material supplier, in order to allow successful demoulding of the part from the cavity, to perform the injection process within a suitable cycle time (i.e.…”

Section: Injection Mouldingmentioning

confidence: 99%

“…Also, the inserts have to be dismounted at each quality control step of the quality control process to be positioned on the measuring instrument, making the whole procedure lengthy and cumbersome. For these reasons, an indirect surface metrology method based on surface replication was developed and applied directly on the tool using a soft replica material (polydimethylsiloxane, PDMS) curing at room temperature [15,16]. The polymer casting replication was performed using a compound supplied in cartridges containing both the polymer (PDMS) and the curing agent, which are automatically mixed in a disposable static-mixing nozzle during the application to the surface.…”

Section: Micro Dimensional Geometrical Metrologymentioning

confidence: 99%

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Surface wear of TiN coated nickel tool during the injection moulding of polymer micro Fresnel lenses

et al. 2012

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“…Advanced precision manufacturing processes are capable of producing surfaces with structured micro-and nano-scale topographic features (e.g., by replication [1]), to achieve specific functional properties (e.g., optical, fluidic, etc.) [2].…”

Section: Introductionmentioning

confidence: 99%

An international comparison of surface texture parameters quantification on polymer artefacts using optical instruments

Tosello

Haitjema²,

Leach

et al. 2016

CIRP Annals

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The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk CIRP Template v4.0 An international comparison of surface texture parameters quantification on polymer artefacts using optical instruments G. Tosello (2) An international comparison of optical instruments measuring polymer surfaces with arithmetic mean height values in the sub-micrometre range has been carried out. The comparison involved sixteen optical surface texture instruments (focus variation instruments, confocal microscopes and coherent scanning interferometers) from thirteen research laboratories worldwide. Results demonstrated that: (i) agreement among different instruments could be achieved to a limited extent; (ii) standardized guidelines for uncertainty evaluation of areal surface parameters are needed for users; (iii) it is essential that the performance characteristics (and especially the spatial frequency response) of an instrument is understood prior to a measurement.Optical, Surface, Comparison

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Replication of micro and nano surface geometries

Cited by 165 publications

References 104 publications

Characterisation of demoulding parameters in micro-injection moulding

Characterisation of demoulding parameters in micro-injection moulding

Surface wear of TiN coated nickel tool during the injection moulding of polymer micro Fresnel lenses

An international comparison of surface texture parameters quantification on polymer artefacts using optical instruments

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