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Slot die

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Slot Die Coating 

Slot die coating is a processing technique for the deposition of homogeneous wet films. Liquid is delivered through a fixed slot gap onto a moving substrate. Between die and substrate a so-called coating bead forms, bounded by the upstream and down-stream menisci. It is usually used to coat large areas or stripes with high uniformity by precise metering the ink and dispensing it at a controlled rate on the moving substrate.

Schematic of the slot die coating process and TSE Troller Slot Die Coater

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Key features

  • Coating of organic or inorganic inks on flexible or rigid substrates
  • Non-contact method
  • Coating of large-area / stripes
  • Homogeneous films with high uniformity
  • Applicable to roll-to-roll processing
  • Broad range of viscosities (from < 1 mPas to several thousand Pas)
  • Film thickness range is large (from 20 nm to approx. 150 nm)

Slot Die Coating of a metaloxide layer using a slot die head from TSE Troller at Empa`s Coating Competence Center.

Slot Die Coating of a thick conductive carbon layer using a slot die head from TSE Troller at Empa`s Coating Competence Center.

Aerosoljet Printing of silver structures for printed transistors at Empa`s Coating Competence Center. Source, drain as well as gate contacts are printed on office paper. The second part of the video shows Inkjet Printing of the active layer to finish the fully-printed-tarnsistor.