Process abilities of the riblet-coating process with dual-cure lacquers

Kordy, Heinrich

doi:10.1016/j.cirpj.2015.08.003

Cited by 8 publications

(8 citation statements)

References 5 publications

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“…The general principle of the (automated) embossing-curing technology for painted Dual-cure Riblets is described by Stenzel et al (2011) and Kordy (2015) and illustrated in Figure 1. The paint formulation is based on a combination of two separate curing mechanisms; to fix the microstructure, UV-curable acrylate binders were used, and to achieve good wear resistance polyurethane components were integrated for a post-curing step.…”

Section: Dual-cure Ribletsmentioning

confidence: 99%

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Drag-reducing riblets with fouling-release properties: development and testing

et al. 2018

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The manufacture and preliminary testing of a drag-reducing riblet texture with fouling-control properties is presented. The commercial fouling-release product Intersleek® 1100SR was modified to manufacture riblet-textured coatings with an embossing technology. Hydrodynamic drag measurements in a Taylor-Couette set-up showed that the modified Intersleek® riblets reduced drag by up to 6% compared to a smooth surface. Barnacle settlement assays demonstrated that the riblets did not substantially reduce the ability of Intersleek® 1100SR to prevent fouling by cyprids of Balanus amphitrite. Diatom adhesion tests revealed significantly higher diatom attachment on the riblet surface compared to smooth Intersleek® 1100SR. However, after exposure to flow, the final cell density was similar to the smooth surface. Statically immersed panels in natural seawater showed an increase of biofilm cover due to the riblets. However, the release of semi-natural biofilms grown in a multi-species biofilm culturing reactor was largely unaffected by the presence of a riblet texture.

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Section: Dual-cure Ribletsmentioning

confidence: 99%

“…Schematic of the simultaneous embossing-curing technology developed by fraunhofer ifAM (see alsoKordy 2015).…”

mentioning

confidence: 99%

Drag-reducing riblets with fouling-release properties: development and testing

et al. 2018

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“…Unfortunately, the material cost of such coatings is quite high and the generation of surface relief structures is laborious and difficult to scale-up due to the crosslinked nature of these coatings. Processes to generate such surface relief structures have been developed but involve complex and costly mask exposures, etching procedures and/or dedicated equipment for simultaneous ultra-violet light curing and surface structuring (Stenzel et al 2010;Stenzel et al 2011;Kordy 2015;Kommeren et al 2016;Kommeren et al 2019).…”

Section: Discussionmentioning

confidence: 99%

Thermoplastic, rubber-like marine antifouling coatings with micro-structures via mechanical embossing

et al. 2020

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New processing routes and materials for non-biocidal, antifouling (AF) coatings with an improved performance are currently much sought after for a range of marine applications. Here, the processing, physical properties and marine AF performance of a fluorinated coating based on a thermoplastic (non-crosslinked) fluorinated polymer are reported. It was found that the addition of lubricating oil and hydrodynamic drag reducing microstructures improved the AF properties substantially, i.e. the settlement of a marine biofilm, containing mixed microalgae including diatoms, was reduced to low levels. More importantly, the remaining fouling was removed from the coatings at low hydrodynamic shear rates and promising AF properties were obtained. Moreover, additional potential benefits were revealed originating from the thermoplastic nature of the coating material which might result in significant cost reductions.

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“…The second term H w describes the initial web shape, which partly follows the roller surface. The last term W w (X ′ ) represents the web deformation, which will follow from equation (11). It is assumed that the resin can sustain small negative pressures without cavitating.…”

Section: Model Descriptionmentioning

confidence: 99%

“…7 The patterning method can be used to fabricate functional layers or to enhance the optical or mechanical properties of a substrate. Applications can be found in, for example, anti-reflection or light-trapping films for displays and solar panels, 8,9 optical waveguides for augmented reality, 10 drag reduction films for aviation and shipping, 11,12 antifouling surfaces, 13,14 and many more.…”

Section: Introductionmentioning

confidence: 99%

Elastohydrodynamic lubrication of soft-layered rollers and tensioned webs in roll-to-plate nanoimprinting

Snieder

Dielen²,

Ostayen

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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This work presents the development of a numerical model for the elastohydrodynamic lubrication of roll-to-plate nanoimprinting with flexible stamps. Roll-to-plate nanoimprinting is a manufacturing method to replicate micro- and nanotextures on large-area substrates with ultraviolet-curable resins. The roller is equipped with a relatively soft elastomeric layer, which elastically deforms during the imprint process. The elastic deformation is described by linear elasticity theory. It is coupled to the pressure build-up in the liquid resin film, which is described by lubrication theory. The flexible stamp, which is treated as a tensioned web, is pre-tensioned around the roller. The elastic deformation of the tensioned web is described by the large-deflection bending of thin plates equations, considering its non-negligible bending stiffness. A Fischer–Burmeister complementarity condition captures the contact mechanics between the tensioned web and the roller. The governing equations combine in a coupled elastohydrodynamic lubrication model, which is fully described by a set of non-dimensional numbers. These are used in a parameter study to investigate the effect on the pressure and film height distributions. It is shown that the bending stiffness of the tensioned web results in an additional hydrodynamic pressure peak and corresponding minimum in the film height, near the inlet of the roller contact. An increase of the bending stiffness corresponds to a decrease in film height. The numerical results are compared with benchmarks from literature and experimentally validated with layer height measurements from flat layer imprints. Good agreement is found between the numerical and experimental results.

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Process abilities of the riblet-coating process with dual-cure lacquers

Cited by 8 publications

References 5 publications

Drag-reducing riblets with fouling-release properties: development and testing

Drag-reducing riblets with fouling-release properties: development and testing

Thermoplastic, rubber-like marine antifouling coatings with micro-structures via mechanical embossing

Elastohydrodynamic lubrication of soft-layered rollers and tensioned webs in roll-to-plate nanoimprinting

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