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INFINITY EX SCRE ENS AN D SCRE EN IM AGES SCREEN FI DUCIAL MA INTEN ANCE 26.1 2 Technical Reference Manual Chapter Iss ue 1 Mar 01

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INFINITY
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SCREENS AND SCREEN IMAGES
SCREEN FIDUCIAL MAINTENANCE
26.10 Technical Reference Manual Chapter Issue 1 Mar 01
6. Place the shield over the fiducial area and gently rub the screen surface with
the course eraser, as shown in the Figure. Do not rub aggressively. The
objective is to remove any minute excess of the filler and to create the
contrast between the screen and fiducial.
7. With the shield still in place rub gently with the soft eraser to give the screen
a bright finish. This enhances the screen to fiducial contrast.
After the pre-determined maintenance period has lapsed, the fiducial to screen
contrast requires a touch up, therefore a screen burnish is required. If fiducial
erosion is occurring, the fiducial fill procedure is required.
Figure 26-8 Fiducial Burnishing
Stencil
Eraser
Eraser Shield
Eraser
Burnishing the Screen and Fiducial Using Eraser and Shield
Stencil
Filler
Eraser Shield
INFINITY
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SCREENS AND SCREEN IMAGES
SCREEN FIDUCIAL MAINTENANCE
Chapter Issue 1 Mar 01 Technical Reference Manual 26.11
Burnishing Carry out the following burnishing procedure for brass stencils:
1. Place the shield over the fiducial area and gently rub the screen surface with
the course eraser. Do not rub aggressively. The objective is to remove any
tarnishing to create the contrast between the screen and fiducial.
2. With the shield still in place rub gently with the soft eraser to give the screen
a bright finish. This enhances the screen to fiducial contrast.
Materials • Filler & activator - Black Tak 410 from Loctite type.
• Eraser - course type as used for typing correction.
• Eraser - soft type as used for drafting film.
• Applicator - green, available from Loctite.
• Blade - scalpel type Swan-Morton No. 11 + holder.
• Shield - thin metal type with various shapes and sizes ie circles squares etc.
Fiducial Repair Kit A kit for fiducial filling is available from the DEK Precision Screen Division.
• Part No. 173257
INFINITY
EX
SCREENS AND SCREEN IMAGES
SCREEN FIDUCIAL MAINTENANCE
26.12 Technical Reference Manual Chapter Issue 1 Mar 01