Operating press

Operating press

Adjusting the press

Ink feed:

- total

- CD

Fountain solution feed:

- total

Press speed, web tension

Colour register

- manually

- automatically

Folder adjustments

Adjusting the press

Ink and water feed

adjustment at low speed to

minimize waste

Ink feed is adjusted

according to

• constant print

density

• pressman’s eye

• proof accepted by

client

MD

32 mm

Adjusting press

Water feed is adjusted

according to

• minimum water feed (just above toning level)

• by pressman’s experience with the paper

• but also very often according to the previously printed paper

Make-ready waste usually ~

500 - 5000 copies

MD

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)

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