Recent developments in hot embossing – a review

Deshmukh, Swarup S.; Goswami, Arjyajyoti

doi:10.1080/10426914.2020.1832691

Cited by 43 publications

(23 citation statements)

References 230 publications

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“…Due to the simple and low temperature processing, the final surfaces are free of toxic or chemically modified leftovers. According to the required processing throughput and final textured area, hot embossing can be implemented in plate-to-plate, roll-to-plate or roll-to-roll systems [ 13 , 14 , 15 ]. Therefore, this method can be tailored to specific application requirements with low costs and high productivity.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps

et al. 2021

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Nowadays, the demand for surface functionalized plastics is constantly rising. To address this demand with an industry compatible solution, here a strategy is developed for producing hierarchical microstructures on polyethylene terephthalate (PET) by hot embossing using a stainless steel stamp. The master was structured using three laser-based processing steps. First, a nanosecond-Direct Laser Writing (DLW) system was used to pattern dimples with a depth of up to 8 µm. Next, the surface was smoothed by a remelting process with a high-speed laser scanning at low laser fluence. In the third step, Direct Laser Interference Patterning (DLIP) was utilized using four interfering sub-beams to texture a hole-like substructure with a spatial period of 3.1 µm and a depth up to 2 µm. The produced stamp was used to imprint PET foils under controlled temperature and pressure. Optical confocal microscopy and scanning electron microscopy imaging showed that the hierarchical textures could be accurately transferred to the polymer. Finally, the wettability of the single- and multi-scaled textured PET surfaces was characterized with a drop shape analyzer, revealing that the highest water contact angles were reached for the hierarchical patterns. Particularly, this angle was increased from 77° on the untreated PET up to 105° for a hierarchical structure processed with a DLW spot distance of 60 µm and with 10 pulses for the DLIP treatment.

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Section: Introductionmentioning

confidence: 99%

Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps

et al. 2021

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“…Roll-to-roll (R2R) hot embossing is a large-batch thermoforming process for mass manufacturing microfluidic devices. 135 An inertial microfluidic device with a simple and low-aspect-ratio straight microchannel was fabricated using R2R hot embossing on polymethyl methacrylate (PMMA) foil and was successfully employed for size-based particle separation (Fig. 3(b)).…”

Section: Rapid Prototyping For Mass Manufacturing and Creating Novel ...mentioning

confidence: 99%

Inertial microfluidics: current status, challenges, and future opportunities

Xiang

Zhang

2022

Lab Chip

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“…Because of the distinct vibrational motion of polymer molecules and nano size effect, the thermal energy can exceed the potential barrier for the rotation and translation of polymer molecules. [ 70 ] Thus, by applying thermoforming under a rubbery state of polymers with micro/nanostructures, the mass production of functional devices with high‐precision features can be realized.…”

Section: Micro/nanomoldingmentioning

confidence: 99%

Current and Future Trends for Polymer Micro/Nanoprocessing in Industrial Applications

et al. 2022

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Polymers are widely used in optical devices, electronic devices, energy‐harvesting/storage devices, and sensors, owing to their low weight, excellent flexibility, and simple fabrication process. With advancements in micro/nanoprocessing techniques and more demanding application requirements, it is becoming necessary to realize high‐resolution fabrication of polymers to prepare miniaturized devices. This is particularly because conventional processing technologies suffer from high thermal stress and strong adhesion/friction, which can irreversibly damage the micro/nanostructures of miniaturized devices. In addition, although the use of advanced fabrication methods to prepare high‐resolution micro/nanostructures is explored, these methods are limited to laboratory research or small‐batch production. This review focuses on the micro/nanoprocessing of polymeric materials and devices with high spatial precision and replication accuracy for industrial applications. Specifically, the current state‐of‐the‐art techniques and future trends for micro/nanomolding, high‐energy beam processing, and micro/nanomachining are discussed. Moreover, an overview of the fabrication and applications of various polymer‐based elements and devices such as microlenses, biosensors, and transistors is provided. These techniques are expected to be widely applied for multiscale and multimaterial processing as well as for multifunction integration in next‐generation integrated devices, such as photoelectric, smart, and biodegradable devices.

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Recent developments in hot embossing – a review

Cited by 43 publications

References 230 publications

Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps

Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps

Inertial microfluidics: current status, challenges, and future opportunities

Current and Future Trends for Polymer Micro/Nanoprocessing in Industrial Applications

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