Fotecoat 1915 WR Emulsion

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FOTECOAT 1915 WR

Sensitizing by the DIR-AD System

Description

− 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.

 

Application advantages

− 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.

 

Stencil quality

− The definition is excellent. The high solids content allows to reach a flat stencil surface combined with excellent mesh bridging.

− The resolution is good.

 

Stocking

− Unsensitized: up to 1 year

− Sensitized, at 20°C: 1 - 2 weeks

− Pre-coated screens stored

 in complete darkness at 20°C:: 3 weeks

 

Exposure times

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

 

Decoating

− 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.

 

Post-exposure

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.

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