Precision Mold Manufacturing for Polymer Optics

Speich, Marco; Börret, Rainer; Silva, A.K.M. De; Harrison, David K.; Rimkus, W.

doi:10.1080/10426914.2012.727124

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…In this paper, polymer PDMS is selected to make the colour-changing layer of the microfluidic devices due to its characters [20,21], such as high optical transparency in clean environments, less fragile and less expensive. More importantly, it is very convenient to make microfluidic devices with PDMS by using dry film moulds.…”

Section: Fabrication Of the Microfluidic Colour-changing Devices Usinmentioning

confidence: 99%

Low-cost and facile implementation of microfluidic colour-changing devices using dry film photoresist-based moulds

Zhang

2018

Journal of Experimental Nanoscience

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In this work, different microfluidic colour-changing devices are implemented by using dry film photoresist-based moulds instead of standard photolithography moulds. EtertecHT-115T negative dry film photoresist is employed to realise the rapid fabrication of the moulds for colour-changing layers. The major factors that may affect the fidelity of the dry film moulds during fabrication are summarised and analysed, including the optimum exposure times and the appropriate developing times. Especially, the impacts of different concentrations of sodium carbonate (Na 2 CO 3) solution on developing rate are investigated for 1-5 layers (50-250 lm thick) of EtertecHT-115T dry film photoresists by experiments. The created dry film moulds show the advantages of low cost, high manufacturing efficiency and requiring no professional training. Each application of the microfluidic colourchanging devices presents high transparency and good colourchanging effect. The microfluidic colour-changing layers based on dry film moulds can be used in different wearable devices of human, and also can be applied for realising surface camouflage and display functions of soft machines/robotics.

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Section: Fabrication Of the Microfluidic Colour-changing Devices Usinmentioning

confidence: 99%

Low-cost and facile implementation of microfluidic colour-changing devices using dry film photoresist-based moulds

Zhang

2018

Journal of Experimental Nanoscience

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“…They were rotationally polished with a round polishing mask and a manual finishing through an experienced polisher. Cavity one was polished with a fully automated polishing technique (robot with polishing head) [15,16]. The polishing path was arranged in a circular manner.…”

Section: Samples and Measuring Processmentioning

confidence: 99%

Quality control of injection molded eyewear by non-contact deflectometry

Speck

Zelzer

Langenbucher

et al. 2014

J. Eur. Opt. Soc.-Rapid Publ.

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Occupational eye wear such as safety spectacles are manufactured by injection molding techniques. Testing of the assembled safety spectacle lenses in transmission is state of the art, but there is a lack of surface measurement systems for occupational safety lenses. The purpose of this work was to validate a deflectometric setup for topography measurement, detection of defects and visualization of the polishing quality, e.g. casting indentations or impressions, for the production process of safety spectacles. The setup is based on a customized stereo phase measuring deflectometer (PMD), equipped with 3 cameras with f'1,2 = 16 mm and f'3 = 8.5 mm and a specified measurement uncertainty of ± 3 µm. Sixteen plastic lenses and 8 corresponding injection molds from 4 parallel cavities were used for validation of the deflectometer. For comparison an interferometric method and a reference standard (< λ/10 super polished) was used. The accuracy and bias with a spherical safety spectacle sample was below 1 µm, according to DIN ISO 5725-2.2002-12. The repeatability was 2.1 µm and 35.7 µm for a blind radius fit. In conclusion, the PMD technique is an appropriate tool for characterizing occupational safety spectacle and injections mold surfaces. With the presented setup we were able to quantify the surface quality. This can be useful and may optimize the quality of the end product, in addition to standardized measuring systems in transmission.

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“…There are still some unknown factors as the current robot polishing process consists of eight to fourteen different polishing parameters as mentioned by (Speich, Rimkus, Börret, & Harrison, 2012). The variation of these polishing parameters affect the final quality of the surface as it produces different surface roughness and material removal rates.…”

Section: Introductionmentioning

confidence: 99%

Material removal simulation for steel mould polishing

Almeida

Börret

Rimkus

et al. 2017

Production & Manufacturing Research

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The surface finish of an injection mould influences the quality of the moulded polymer optic parts. In order to improve and control the surface finish of the mould it is important to be able to predict the material removal during the polishing process of this mould. The aim of this work is to predict the material removal during the polishing process, comparing the results obtained from polishing attempts on steel samples and the results obtained from a simulation model. A simulation model is developed with the abrasive wear Holm-Archard equation in ANSYS. This simulation model will help to eliminate the iterative trial and error polishing, therefore facilitating the steel mould production.

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Precision Mold Manufacturing for Polymer Optics

Cited by 8 publications

References 7 publications

Low-cost and facile implementation of microfluidic colour-changing devices using dry film photoresist-based moulds

Low-cost and facile implementation of microfluidic colour-changing devices using dry film photoresist-based moulds

Quality control of injection molded eyewear by non-contact deflectometry

Material removal simulation for steel mould polishing

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