Operating press

1. Operating press

2. Adjusting the press
Colour register
- manually
Ink feed: - automatically
- total
- CD
Fountain solution feed:
- total
Press speed, web tension
Folder adjustments

3. Adjusting the press
Ink and water feed
adjustment at low speed to
minimize waste
Ink feed is adjusted
according to
MD
• constant print
density
• pressman’s eye
• proof accepted by
client
32 mm

4. Adjusting press
Water feed is adjusted
according to
• minimum water feed
(just above toning
level)
• by pressman’s
experience with the
MD
paper
• but also very often
according to the
previously printed
paper
Make-ready waste usually ~
500 - 5000 copies

5. Makeready - running
Running the press
• pressman adjustes ink and water feed during the run
• samples are taken for the customer between agreed
number of copies
• blankets are washed after certain amount of copies
• depending on the printer’s tolerance
• depending on the paper used
• typically
• 30 000 - 300 000 copies (heatset)
• few thousand (sheet-fed)

6. Paper waste in printing
Heatset
• White paper waste
• Slab waste (0.2-0.5 %)
• Core waste
• Make ready on press (-5000 cps)
• Running waste
• Web breaks (0.5-5% from the reel used)
• Blanket washing (30 000 – 300 000 cps)
• Bindery waste
Total paper waste ~10-20%
Sheetfed
• Much less than in heatset