press acceptance tests - wan-ifrafile/moritzschwarzpressacceptancetest.pdf · ifra acceptance tests...
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![Page 1: Press Acceptance Tests - WAN-IFRAFile/MoritzSchwarzPressAcceptanceTest.pdf · IFRA Acceptance Tests Aim: helping newspapers buying and checking investments Acceptance tests for CTP,](https://reader031.vdocument.in/reader031/viewer/2022011900/5ee12078ad6a402d666c1f1f/html5/thumbnails/1.jpg)
© 2009 WAN-IFRA
Press Acceptance Tests
Master of Science
Moritz SchwarzSenior Consultant
[email protected]+49 6151 733 761
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© 2009 WAN-IFRA
General Remarks
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© 2009 WAN-IFRA, 3
IFRA Acceptance Tests
Aim: helping newspapers buying and checking investments
Acceptance tests for CTP, press, and mailroom
Test procedures were developed and approved by the IFRA Newspaper Production committee
Members in the committees:
Press Manufacturers
Newspapers
IFRA
Results are published in Special Reports:
Press: 3.16 (1991), 3.16.2 (1999), 3.16.3 (2003), 1-2008
Mailroom: 4.11.1 (1996), 4.11.2 (2001)
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© 2009 WAN-IFRA, 4
IFRA Acceptance Tests
The test should be performed:
After new installation
After reconstructions
In parts as necessary
Different tests for:
Acceptance of print quality
Checking of the folder performance
It should be determined weather:
Press performance in accordance with sales contract
Waste is in accordance with contract
Quality is in accordance with guaranteed values
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© 2009 WAN-IFRA, 5
IFRA Acceptance Test Benefits
Find hidden problems
Security for further processing (mailroom)
Independent checking of investments
Detailed report gives documentation of status for future reference which is useful for the buyer, manufacturer, operators etc.
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© 2009 WAN-IFRA, 6
IFRA Acceptance Tests Organisation
Presence of:
Press manufacturer representative
Buyer representative
Experienced printers from buyer/manufacturer
Third neutral party (WAN-IFRA)
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© 2009 WAN-IFRA, 7
IFRA Press Tests Organisation
Manufacturer and buyer must agree on:
Materials
Underpacking
Blankets
Roller and impression settings
Tension controls
Dampening values/curves (temperature, …)
Press hall air conditions
If necessary manufacturer must be given opportunity to check and change settings and materials
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© 2009 WAN-IFRA, 8
IFRA Press Tests
Conditions during test:
Use a warm press
Print measuring targets on one side only
Go up to specified speeds
No big changes (web lead, inks, plates) during test
Particular tests should be collected from one paper reel
No adjusting or changes during sampling
Random set of 5 copies are evaluated from each sample set (20 copies)
Always run some minutes in same conditions before taking samples (not valid for changing speed tests)
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© 2009 WAN-IFRA
Quality Acceptance Tests
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© 2009 WAN-IFRA, 10
Subparts of Quality Acceptance Tests
A1 – Pre-setting according to scanner or RIP data
A2 – Pre-setting according to stored data
B – Register repeatability
C – Increasing speed
D – Max. production speed
E – Decreasing speed
F – Safety stop
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© 2009 WAN-IFRA, 11
Sequence of Press Quality Tests
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© 2009 WAN-IFRA, 12
Test A1 – Presetting to RIP Data
Only dampening adjustments allowed
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© 2009 WAN-IFRA, 13
Test A2 – Presetting to stored Data
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© 2009 WAN-IFRA, 14
Test B – Register Repeatability
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© 2009 WAN-IFRA, 15
Test C – Increasing Speed
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© 2009 WAN-IFRA, 16
Test D – Process Quality and Stability
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© 2009 WAN-IFRA, 17
Test E – Decreasing Speed
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© 2009 WAN-IFRA, 18
Test F – Emergency Stop
F
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© 2009 WAN-IFRA, 19
Tested Parameters
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© 2009 WAN-IFRA, 20
Testform
First printed edge →
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© 2009 WAN-IFRA, 21
Testform
Custom made to:
• page size
• press ink zones
Aims:
• Even distribution of
ink across press
• Check printing
problems
• Evaluate quality
indicators
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© 2009 WAN-IFRA, 22
Testform
• Information fields
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© 2009 WAN-IFRA, 23
Testform
• Slurring• Dot doubling
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© 2009 WAN-IFRA, 24
Testform
• Ghosting
D75
DG
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© 2009 WAN-IFRA, 25
Testform
• Starvation
DSDN
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© 2009 WAN-IFRA, 26
Testform
Greybalance bar = C 30%, M 24%, Y 24%
Black halftone bar = K 34%
Horizontal solid bars to adjust ink distribution
Aim dry solid densities: C, M, Y = 0,90; K = 1,10
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© 2009 WAN-IFRA, 27
Testform
Monochrome halftones:
• Plate curve
• Print curve
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© 2009 WAN-IFRA, 28
Testform
Vernier marks/Techkon dots :
• Color-to-color register
• Register stability
• Fan-out
• Register in each page
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© 2009 WAN-IFRA, 29
Testform Placement Example 4/2 press
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© 2009 WAN-IFRA, 30
Average Density Deviation from Target Value
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© 2009 WAN-IFRA, 31
4c-Midtone Spread
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© 2009 WAN-IFRA
Performance Tests
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© 2009 WAN-IFRA, 33
Performance Tests
Aims:
Achieved net production (folder capacity)
Quality check at different productions
Test P1: paper waste level(s)
Tests run conditions:
constant speed
changing speed
minimum pagination
maximum pagination
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© 2009 WAN-IFRA, 34
Performance Tests Conditions
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© 2009 WAN-IFRA, 35
Performance Tests Conditions
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© 2009 WAN-IFRA, 36
Performance Tests Indicators
Tested indicators:
Pasting/splicing failures
Waste during reel splice, press start, press restart
Fold quality:Fold heightOver foldFormer fold registersCylinder fold registersQuarter fold registers
Slitting register
Cylinder cut-off register
Shingle stream delivery
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© 2009 WAN-IFRA, 37
• Former fold register
Performance Tests Indicators
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© 2009 WAN-IFRA, 38
Performance Tests Indicators
• Cylinder fold register• Quarter fold register
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© 2009 WAN-IFRA, 39
Performance Tests Indicators
• Cut-off register
• Slitting deviations
• Cylinder cut-off deviations
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© 2009 WAN-IFRA, 40
Performance Tests Indicators
Shingle stream quality for single and double production
a: longitudinal distance
b: tolerance
c: inclined position
d: lateral offset
cd
d
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© 2009 WAN-IFRA, 41
Performance Tests Indicators
Prefold accuracy:
h: height of folded edge
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© 2009 WAN-IFRA, 42
Performance Tests Indicators
Web wander
Size and position of pinholes on product
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© 2009 WAN-IFRA, 43
Further readings
Special Report 1-2008 includes:
Acceptance test description
Evaluation method
Testform layout
Tolerances applicable on anaverage modern press
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© 2009 WAN-IFRA, 44
Further readings
Special Report 4.11.2