BCD input from WG2 WG2 12/08/2005 H. Hayano Chris Adolphsen Terry Garvey Hitoshi Hayano.
Knot test development CEN/TC 139/WG2 N 348 Peter Svane Coating Consultancy Copenhagen.
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Transcript of Knot test development CEN/TC 139/WG2 N 348 Peter Svane Coating Consultancy Copenhagen.
![Page 1: Knot test development CEN/TC 139/WG2 N 348 Peter Svane Coating Consultancy Copenhagen.](https://reader035.fdocuments.us/reader035/viewer/2022070415/5697bf781a28abf838c81d9c/html5/thumbnails/1.jpg)
Knot test developmentCEN/TC 139/WG2 N 348
Peter Svane
Coating Consultancy
Copenhagen
![Page 2: Knot test development CEN/TC 139/WG2 N 348 Peter Svane Coating Consultancy Copenhagen.](https://reader035.fdocuments.us/reader035/viewer/2022070415/5697bf781a28abf838c81d9c/html5/thumbnails/2.jpg)
Contribution to knot test development
• Starting point Doc. N.303
• Try test method
• Is an internal standard useful?
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Coating systems
• 9 WB systems (primer + acrylic paint)
• SB Polyurethane paint (Internal reference)
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Exposure time in QUV
Days exposure in QUV - Delta E for Primer 1
0
2
4
6
8
10
12
14
16
Del
ta E
1 day
2 days
3 days
A - acrylic B - alkyd/acrylic E - long oil alkyd F - polyurethane
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Knots
![Page 7: Knot test development CEN/TC 139/WG2 N 348 Peter Svane Coating Consultancy Copenhagen.](https://reader035.fdocuments.us/reader035/viewer/2022070415/5697bf781a28abf838c81d9c/html5/thumbnails/7.jpg)
B-knots vs. C-knotsAverage. B- vs. C-knot - primer 1 - 3 days in QUV
0,0
5,0
10,0
15,0
20,0
25,0
Del
ta E
B
C BC
B
C
BC
A - acrylic B - alkyd/acrylic E - long oil alkyd F - polyurethane
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B- vs. C-knots
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
0 1 2 3 4 5 6
Del
ta E
B-knots
C-knots
System A
![Page 9: Knot test development CEN/TC 139/WG2 N 348 Peter Svane Coating Consultancy Copenhagen.](https://reader035.fdocuments.us/reader035/viewer/2022070415/5697bf781a28abf838c81d9c/html5/thumbnails/9.jpg)
Polyurethane
0,0
2,0
4,0
6,0
8,0
10,0
12,0
0 1 2 3 4 5 6
Del
ta E
C
B
C- vs. B-knots
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Time between machining and coating
12,2
8,7
5
6,6
0
2
4
6
8
10
12
14
0 2 4 6 8 10 12 14 16
Døgn
Del
ta E
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Shellac or not
0,0
2,0
4,0
6,0
8,0
10,0
12,0
0 1 2 3 4 5 6
Del
ta E
K
K
K K
K
B
BB
B
BShellac
No shellac
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Gruppe 5. PU vs. acrylic
0,0
2,0
4,0
6,0
8,0
10,0
12,0
0 1 2 3 4 5 6
Del
ta E
K
KK
K
K
BB
B
B
B
PU
Acrylic
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”B-knots”
”C-knots”
Reference
Test system
Matched panels
Suggested setup using matched panels and an internal reference coating
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Colour measurement on knots"Worst" vs. mean
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
19 B 19 K 78 B 78 K 79 B 79 K 164 B 164 K 165 B 168 K
Del
ta E
"worst"
Coating system A
"mean"
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Primer 1 vs. PU
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
1 2 3 4 5 6
Del
ta E
PU
Acrylic
![Page 16: Knot test development CEN/TC 139/WG2 N 348 Peter Svane Coating Consultancy Copenhagen.](https://reader035.fdocuments.us/reader035/viewer/2022070415/5697bf781a28abf838c81d9c/html5/thumbnails/16.jpg)
Primer 3 vs. PU
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
1 2 3 4 5 6
Del
ta E
PU
Acrylic
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Primer 4 vs. PU
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
1 2 3 4 5 6
Del
ta E
Acrylic
PU
![Page 18: Knot test development CEN/TC 139/WG2 N 348 Peter Svane Coating Consultancy Copenhagen.](https://reader035.fdocuments.us/reader035/viewer/2022070415/5697bf781a28abf838c81d9c/html5/thumbnails/18.jpg)
Primer 5 contra PU
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
1 2 3 4 5 6
Del
ta E
PU
Acrylic
![Page 19: Knot test development CEN/TC 139/WG2 N 348 Peter Svane Coating Consultancy Copenhagen.](https://reader035.fdocuments.us/reader035/viewer/2022070415/5697bf781a28abf838c81d9c/html5/thumbnails/19.jpg)
Comments
• Conditioning: 50 %RH → 65 %RH• Weather-Ometer → QUV (?)• Panel dimensions acc. to exposure apparatus• Black panel temp. 60 °C → 40 °C (?)• Time from machining to coating strongly influences
staining• Time from machining to coating: 2 weeks• Staining should be measured as the worst
discolouration on a knot• Internal reference concept works, but is it
worthwhile?
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Consequences
• Doc. N 303 revised
• Present version is N 341
• Further experiments
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Primer 6 vs PU
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
Del
ta E
Primer 6
PU
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Primer 7 vs PU
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
Del
ta E
P
Primer 7
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Primer 8 vs PU
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
Del
ta E
Primer 8
PU
![Page 24: Knot test development CEN/TC 139/WG2 N 348 Peter Svane Coating Consultancy Copenhagen.](https://reader035.fdocuments.us/reader035/viewer/2022070415/5697bf781a28abf838c81d9c/html5/thumbnails/24.jpg)
Primer 9 vs PU
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
Del
ta E
PU
Primer 9
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Comments II
• Graphs for test systems and references have the same shape. Often however one knot gives a much different discolouration
• No influence from the type of knot (“B-” or “C-knot”).
• Whether the concept of using an internal reference is useful calls for statistic evaluation
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Statistic evaluation
• Ranking according to draft 927-7 (N341):
9 = 6 = 4 = 2 = 1 < 5 < 3 = 7 < 8 9 < 1
• Ranking with internal reference included:
9 = 4 = 6 = 1 = 2 < 5 < 7 = 3 = 8
6 < 2 7 < 8
![Page 27: Knot test development CEN/TC 139/WG2 N 348 Peter Svane Coating Consultancy Copenhagen.](https://reader035.fdocuments.us/reader035/viewer/2022070415/5697bf781a28abf838c81d9c/html5/thumbnails/27.jpg)
Conclusion
• Draft EN 927-7:
• Large variation between individual test panels
• Inclusion of an internal standard apparently does not improve discrimination
![Page 28: Knot test development CEN/TC 139/WG2 N 348 Peter Svane Coating Consultancy Copenhagen.](https://reader035.fdocuments.us/reader035/viewer/2022070415/5697bf781a28abf838c81d9c/html5/thumbnails/28.jpg)
Suggestion
• Test procedure should be polished
• Round Robin on draft EN 927-7
• Maybe more test panels