FOTECOAT 1915 WR
Sensitizing by the DIR-AD System
− Fast, duo-cure polymer type textile printing screen process emulsion with separate diazo sensitizer powder, for aqueous ink systems.
− Light purple color with excellent see-through.
− The ready-made stencil can be post-hardened by light to increase the mechanical and the solvent resistance.
− Very short exposure time.
− Ecologically sound.
− 41% solids content.
− Medium viscosity, appropriate for meshes between 45 T and 120 T (lower viscosity than FOTECOAT 1065 and a higher viscosity than FOTECOAT 1636).
− FOTECOAT 1915 WR is a water resistant emulsion that can be printed with most inks containing water and little solvents.
− A longer exposure renders the stencil more resistant against abrasion and therefore allows to print longer runs.
− FOTECOAT 1915 WR can be decoated.
− If a permanent stencil for all inks is desired a longer post-hardening by light or a chemical treatment with FOTECHEM 2110 or 2100 Hardener can be used. In such a case the stencil can no longer be decoated.
Coating technique and stencil build-up
Because of the relatively high viscosity of FOTECOAT 1915 WR it is recommended to degas the emulsion after sensitizing during a few hours.
Mesh Coating Stencil thickness below mesh
43 T multifilament 1/2 20 microns
43 T monofilament 1/1 20 microns
77 T monofilament 1/2 15 microns
120 T monofilament 1/1 4 microns
120 T monofilament 2/3 14 microns
FOTECOAT 1915 WR is ideal for machine coating. If necessary, the emulsion can be diluted with water to reach a lower viscosity.
− The definition is excellent. The high solids content allows to reach a flat stencil surface combined with excellent mesh bridging.
− The resolution is good.
− Unsensitized: up to 1 year
− Sensitized, at 20°C: 1 - 2 weeks
− Pre-coated screens stored
in complete darkness at 20°C:: 3 weeks
5 KW metal halide lamp at 100 cm distance; iron charged high pressure burner at 100 hours burning time.
Coating Mesh Time in seconds
1/2 43 T multifilament white 100
1/1 43 T monofilament white 70
1/2 43 T monofilament dyed 105
1/2 77 T monofilament white 90
1/2 77 T monofilament dyed 135
1/1 120 T monofilament white 50
1/1 120 T monofilament dyed 75
1/2 120 T monofilament white 60
1/2 120 T monofilament dyed 90
2/3 120 T monofilament white 70
2/3 120 T monofilament dyed 105
− Only possible with high pressure gun.
− A higher concentrated remover than usual has to be used. Ideal are FOTECHEM 2004 liquid or FOTECHEM 2005 paste.
− For machine decoating the concentration of the remover liquid has to be increased and the speed of the machine be reduced to a minimum.
− A post-exposure makes the stencil removal easier.
Once the stencil is washed-out and dryed it can be exposed again under the sun, day light fluorescent tubes or with the standard exposure lamp; it is recommended to make the post-exposure without the vacuum frame so that no glass between the lamp and the stencil interferes with light absorption.