Sheen_Catalogue AW.indd

Appearance
4.0
oranGe peel & doi
Orange peel is a phenomenon perceived as
a wavy pattern disturbing highly glossed
painted surfaces e.g. automotive body
finishes. It affects the smoothness and the
mirror-like appearance of such finishes.
The causes could be due to a number
of factors: the flow and levelling
characteristics of the paint system,
processing parameters, coating thickness,
substrate roughness, or paint formulation.
This effect can be seen from varying
distances, from approx. 0.4 to 3 m, as small
and large waviness patterns. In addition
to the visible conditions, invisible patterns
less than 0.1 mm reduce the gloss, and as
a result affect the Distinctness of Image
(DOI).
In the past, these appearance attributes
were measured in various different terms
or scales, depending on the manufacturers
and their evaluation practices. Today the
Wave-Scan DOI offers standard methods
to objectively define these attributes and
ensure better process control, of particular
use in the automotive industry.
Small waves large waves
Measurement of orange peel
Measurement of dullness
16
40
30
20
10
0
< 0.1 < 0.1-0.3 < 0.3-1 1-3 3-10 10-30 mm
du Wa Wb Wc Wd We
50
40
Structure spectrum
16 µm
30
24 µm
20
30 µm
10
0
50 µm
< 0.1 < 0.1-0.3 < 0.3-1 1-3 3-10 10-30 mm
du Wa Wb Wc Wd We
influence of film thickness
Wavescan Dual
This portable instrument allows objective qC evaluation of
surface quality after each point of the painting process.
as with the Wave-scan doi, the integrated laser system
scans the specimen at 60< degrees symbol> over a defined
distance collecting the optical profile.
in order to reproduce human eye response the orange peel
structures are divided into different levels within a spectrum
ranging from 0.1 to 30 mm wavelengths.
additionally an infra-red high energy led also performs
dullness measurement over the same distance using a newly
integrated CCd camera, providing greater information on the
image forming qualities, related to the doi, of the surface
caused by structures < 0.1mm.
data can be transferred from the instrument to a powerful
data capture/analysis package, autochart, which is provided
with the instrument.
Features
optimal correlation to the visual perception of
orange peel & doi
output of long Waves & Short Waves, and doi
independent of paint system and refractive index
reliable measurements on test panels or curved parts
Suitable for solid and metallic coatings
one-hand operation, self calibration
user–defined sampling procedure
Memory 599 values with zone identification
data analysis & management with auto-chart software
Standard package: instrument, Certified reference tile,
protective cover, auto-chart software on Cd, docking
station and interface cable, 2 rechargeable li-ion battery
packs, Battery holder for aa alkaline or rechargeable
batteries, 3 Batteries, operating Manual and Carrying case.
Auto-chart software
instrument programming:
- object identification: car model, colour, paint line
- definition of measurement sequence and zones
identification
analysis with excel TM and access TM :
- trend graph, products comparison, history, structure
“spectrum”
Performance
Application
High to Semi Gloss: du