with DIAZO N° 6
Before coating it is recommended to clean and degrease the screen mesh to achieve reproducible coating results. Ensure proper tension of the screen mesh. Use manual degreasers of the PREGAN range or KIWOCLEAN degreasing concentrates for automatic units (see separate technical information). After thorough rinsing with water and drying the screens are ready for coating.
Coating can be done done manually or by machine. The use of the KIWOMAT coating machine is especially recommended because it achieves a reproducible coating result. If coating is done manually ensure that the mesh openings are filled from the printing side (generally 2-3). Only then begin with the emulsion build-up from the squeegee side - depending on the print job.
The screen must be dried thoroughly before exposing to achieve the highest ink resistance. This should preferably be done in a dust-free drying-chamber with fresh-air inlet at temperatures of between 35 - 40°C.
The stencil is created by UV-light hardening of the non-printing stencil parts. Expose with blue actinic light at a wave length of 350 - 400 nm. A metal halide lamp provides the best results. Due to the many variables that determine the actual exposure time, accurate exposure times cannot be given. Optimum copying results can only be achieved by trials (step exposure). For best resistances, please choose an exposure time which is as long as possible. This maximum exposure time must still allow reproduction of fine details. This is especially important when water based printing inks are used, as the required ink resistance in this case will be achieved by a higher exposure time. Guide values: Light source: 5.000 W metal halide lamp at a distance of 1 m. Manual coating (H), e.g. twice from the printing side and three times from the squeegee side [2D/3R(H)] or automatically with a KIWOMAT MODULAR (MA); coating trough R 125:
8 ± 1 µm
6 ± 1 µm
4 ± 1 µm
* D = coating from printing side, R = coating from squeegee side -: one coating process, /: following coating process
For retouching / blocking-out use products of the KIWOFILLER range. When printing with aqueous inks, preferably use water based products which dry water resistant. These can be removed with PREGASOL decoating agents and a high pressure water washer. For further information contact your KIWO distributor or KIWO direct.
In general, stencils made using AZOCOL Z 1 can easily be decoated with PREGASOL products. Use a PREGAN post-cleaner to remove any ink residue or so-called ghost images which may remain on the screen after decoating. Trials are essential as the type of residue may vary. Please make tests and ask for samples.
Please note that the printing resistance of a screen printing stencil is influenced by a lot of parameters e.g. mesh, coating technique, drying, exposure time etc. Furthermore, a lot of printing media and printing machines are being used in practice which have not all been tested by us. Therefore, please accept our offer and test the suitability of our products by asking for free-of-charge emulsion samples, as we can only guarantee a constant quality according to our own working conditions.
Unsensitized: blue / Sensitized: green
Approx. 7000 mPas (Rheomat RM 180 nach DIN 53019, D = 100 s-1)
Please follow further information given in the material safety data sheet.
Unsensitized: 1 year (at 20 - 25°C). Protect against freezing. Sensitized: approx. 6 weeks (at 20 - 25°C) Screens coated in advance: approx. 4 weeks (at 20 - 25°C and in complete darkness). With longer storage of precoated screens the copying material can absorb humidity from the environment. Dry again prior to copying.
This data sheet is for your information, a legally binding guarantee of the product's suitability for a particular application cannot be derived. No responsibility can be undertaken for occurring damages. Our products are subject to a continuous production and quality control and leave our factory in perfect condition.