Large area roller embossing of multilayered ceramic green composites

Shan, Xuechuan; Soh, Y. C.; Shi, Chee Wai Patrick; Tay, Cho Jui; Lu, Chuanhe

doi:10.1109/dtip.2008.4753009

Cited by 5 publications

(5 citation statements)

References 11 publications

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“…Embossing speed from 0.2 to 20 m min −1 was used to demonstrate a high volume process. The best replication was achieved at the speed of 0.2 m min −1 using a pressure of 8 MPa and a temperature of 105 • C. In order to optimize the R2R hot embossing, process parameters such as roller temperature, applied load and roller speed have been explored in detail [118,119] and the selected results are presented in figure 13. A sustainable throughput of 3 m min −1 was achieved with accurate transcript of the dot shape of 10 μm by the load of 3 kN.…”

Section: Process Study Of R2r Hot Embossingmentioning

confidence: 99%

Micro hot embossing of thermoplastic polymers: a review

Peng

Deng

et al. 2013

J. Micromech. Microeng.

212

157

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Micro hot embossing of thermoplastic polymers is a promising process to fabricate high precision and high quality features in micro/nano scale. This technology has experienced more than 40 years development and has been partially applied in industrial production. Three modes of micro hot embossing including plate-to-plate, roll-to-plate and roll-to-roll have been successively developed to meet the increasing demand for large-area patterned polymeric films. This review surveys recent progress of micro hot embossing in terms of polymeric material behavior, embossing process and corresponding apparatus. Besides, challenges and innovations in mold fabrication techniques are comprehensively summarized and industrial applications are systematically cataloged as well. Finally, technical challenges and future trends are presented for micro hot embossing of thermoplastic polymers.

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Section: Process Study Of R2r Hot Embossingmentioning

confidence: 99%

Micro hot embossing of thermoplastic polymers: a review

Peng

Deng

et al. 2013

J. Micromech. Microeng.

212

157

View full text Add to dashboard Cite

show abstract

“…Processing parameters, e.g. the embossing temperature, the applied force, the feeding speed etc, greatly influence the formability of micro features [31,32]. Makela et al [33] structured submicron-scale gratings on 95 μm thick cellulose In the present study, an R2R hot embossing system has been developed in-house and the R2R hot embossing process for large-area polymeric film with micro-pyramids has been systematically investigated.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the large-area fabrication of micro-pyramid arrays by roll-to-roll hot embossing on PVC film

Deng

Peng

et al. 2014

J. Micromech. Microeng.

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Large-area polymeric components with micro-pyramids have been widely applied in the fields of optics, optoelectronics, biology and chemistry, etc. Roll-to-roll (R2R) hot embossing is regarded as a promising approach to fulfil high throughput fabrication of patterned polymeric films. In this study, an R2R hot embossing system has been developed in-house and effective and continuous production of the polymeric component with micro-pyramids is demonstrated by R2R hot embossing. The influence of processing parameters has been firstly investigated by using the one-variable-at-a-time method. Afterwards, a series of experiments based on the central composite design approach have been conducted for the analysis of variance and the establishment of empirical models of the R2R hot embossing process. As a result, a 90 mm × 90 mm PVC sample with a feature height of 65 µm was successfully fabricated and the height consistency reached 94.5%. Additionally, a process window with a mold temperature of 150–160 °C, an applied force of 18–25 kgf and a feeding speed of 0.3–0.5 m min−1, was established to achieve 100% passable micro-pyramid arrays. The processing rules and the concrete ranges of parameter values can guide the process production of large-area micro-pyramids.

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“…Among these main factors for R2R hot embossing, the roller speed is also related to the time duration effects of heat transfer. A slower roller speed properly secures a longer contact time between mold and polymer, improving embossing results (Ng & Wang, 2008; Shan et al, 2008). However, the substrate’s reverse side against the pressure roll might be better left untreated instead of being preheated because it needs to be more solid to provide proper support for the greater polymer deformation.…”

Section: Discussionmentioning

confidence: 99%

Effects of Preheating and Cooling Durations on Roll-to-Roll Hot Embossing

et al. 2014

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In this study, we examined the sensitivity of embossed pattern depth to preheat supply and cooling and investigated how the pattern type and density affect the embossed depth. The main factors that affect embossed pattern qualities of roll-to-roll hot embossing, such as roller temperature, roller speed, and applied force, were determined using the response surface methodology. Eight conditions were then added to determine the time-dependent effects of heat transfer with custom-designed preheating and cooling systems. An extended preheat time for the polymethylmethacrylate substrate contributed to the significant change in the embossed depth, whereas the substrate-cooling did not exhibit a clear increasing or decreasing trend. Larger embossed depths were achieved in the horizontal patterns with lower density than in the vertical patterns, and the lower pattern densities showed greater embossed depths in most embossing conditions. We expect that this result will help to understand the effects of the pre- and posttreatment of roll-to-roll hot embossing by employing time duration factors of heat transfer, depending on the mold pattern type and density.

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Large area roller embossing of multilayered ceramic green composites

Cited by 5 publications

References 11 publications

Micro hot embossing of thermoplastic polymers: a review

Micro hot embossing of thermoplastic polymers: a review

Experimental investigation on the large-area fabrication of micro-pyramid arrays by roll-to-roll hot embossing on PVC film

Effects of Preheating and Cooling Durations on Roll-to-Roll Hot Embossing

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