9Magazine for Organic & Printed Electronics
Next, the product scales up through
a series of pilot coating trials, testing a
range of coating solutions and conditions.
Data from these trials is typically analysed
collaboratively to construct the best possible
plan for each subsequent trial. The optimal
process conditions for transitioning to com-
mercialisation are identified during bench
and pilot evaluations. The coating conditions
developed on the pilot line are verified or
adjusted for larger-scale production. Once
the product meets all key requirements, the
process is finalised and fully documented.
Creating high-quality electronics films
involves numerous complex variables and
stringent quality guidelines, which require
proper metrics and film quality inspec-
tion methods. As a result, projects should
involve a rigorous production release test,
specialised to meet the stringent optical
and cosmetic requirements of electronics
films. These exacting guidelines include
quality inspection, extensive analyti-
cal testing and clean-room practices.
Quality inspection: Sophisticated 100%
inline quality inspection and process control
techniques optimised to meet high-end
electronics films enable the coating process
to run continuously while monitoring
and controlling deviations that would
negatively affect product performance.
Best-practice inspection techniques help
to identify and characterise contaminants,
minimise anomalies and defects, and
ensure uniform thickness control for high
productivity and high yield processes.
While quality inspection techniques
depend on the material, electronics applica-
tions commonly require sophisticated
optical inspection systems that scan across
the web. The ideal system is designed
to detect objects much smaller than the
defect size limit for the product. When
implementing optical inspection methods,
inspection can be reflective or transmis-
sive with dark field and bright field results.
Another consideration with optical inspec-
tion is the angle of incidence between light
source and the inspected web material.
Optimising incidence angles and correlat-
ing multiple inspection methods enable
anomalies to be spotted in the web.
In coating a clear product, for example,
a dark field inspection might be performed
with the signal reflected because dark
particles and clear gels will reflect light
differently. By using multiple channel (bright
field and dark field/transmissive and reflec-
tive) inspection methods, technicians can
gain a good understanding of any defects
and begin to characterise and correct them.
The latest electronic devices use multiple
layers of optical grade films that contribute a
range of functional properties to the deviceLabCo The Universal Genius for roll-to-roll coating, printing and laminating The perfect solution for laboratory, prototyping or production. With its modular design and versatility, the compact machine is ideal for the widest variety of applica- tions. The LabCo produces high-precision results which are to 100% transferable to wider working widths, also in clean room environments. The LabCo is available to our customers for testing at our in house Technology Center. Contact us now! www.kroenert.de Flexible Photo Voltaics Li-ion Batteries Blister Packaging UV Protective Film Printed Electronics Fuel Cells KROENERT The Coating Machinery Experts Booth No. B0/305