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9

Magazine 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.

Requirements for

electronics films

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 device

LabCo 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