A “sealed” coating system that reduces solvent vaporization between the supply system and coating head is an essential criterion for consistently delivering high-quality coating. HIRANO TECSEED offers multiple “Die Coating Methods” adjusted to various coating film thicknesses, resin properties, and substrate characteristics to do just this. Of these, the “DV Coater” is especially suited to ultra-thin-film coating.
With shear coating methods, typified by lip coating, the “coating gap” formed between the die lip and the backup roller plays an important role in film forming. With recent ultra-thin-film coatings of less than 10 μm (wet), the influence of machine precision can have a significant negative impact on film thickness profiles in shear coating methods, even if the roller runout is only 1 μm. With the DV Coater, which allows for coating using a coating gap that is more than 10 times the wet coating thickness, it is possible to achieve high-precision coating that exceeds the machine precision. Moreover, This coating method can handle a high range of coating thicknesses and viscosities, as well as resin coating where high-shear is a problem in units that come in contact with the coating fluid.

Characteristics:
(1) Coating Range: able to coat a wide range of coating from 3 to 200 μm (wet)
(2) Coating Gap (between slot die and substrate): because the coating system coats with a gap that is several times to several tens of times the coating thickness (wet), coating is not subject to disturbance on the coating surface from substrate thickness variation, contaminants, and dust, etc.
(3) Viscosity Range: able to handle a range of 1 to 10,000 MPa•s
(4) Coating Speed: Able to coat at speeds ranging from low speed to high speed

Specifications/Applications:
Roll Width: Max. width 2,500 mm
Machine Speed: Max. speed 200 m/min
Optical functional films, photosensitive films, masking films, adhesive coating, electronic materials