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Clean Room Production
Clean Room Production
All KOENEN precision screens are manufactured in air-conditioned
class 10000 (ISO 7) clean rooms. Particularly critical processes such
as coating are carried out under laminar airflow, which meets class
100 (ISO 5) clean room conditions. This clean room concept has been
developed based on decades of experience we have in screen technology.
This enables us to ensure economic production with maximum quality.
The production area in the in-house clean room is divided into 6 zones:
- High-resolution laser photoplotter
- Photo plot development
- Coating
- Exposure
- Screen development
- Quality assurance
- All 6 zones are individually controlled and have the same controlled
environmental conditions:
- Room temperature 21 ± 1°C
- Humidity 50 ± 5 %
The screens are automatically cleaned and degreased in a separate zone and then transferred to the clean room via a special pass through.
High-resolution laser photo plots - a “unique KOENEN Service“
High-resolution laser photo plots as well, in combination with the manufacture of stencils in our in-house clean rooms. A unique service, if you expect maximum quality at an acceptable price.The photo plots are produced on our own high-resolution laser photoplotter. This photoplotter is integrated into the clean room to avoid critical film distortion caused by climatic variations.
Thermal coefficient of expansion of the film material:
- 18 µm per °C per 1 m length of film
- 12 µm pro % humidity per 1 m length of film
(for more information please refer to the table)
Technical data laser photoplotter
- Resolution max. 25,400 dpi
- Positioning accuracy ± 4 µm over the entire plot area of 813 x 711 mm²
- Minimum line width 10 µm
Laser photo plots for fine line printing
A resolution between 16,000 and 25,400 dpi is more than sufficient for manufacturing fine line printing screens with positioning accuracy. Higher resolutions will not increase the quality and are uneconomic.Laser photo plots for special applications
For special applications (for example angle encoders) we can of cause also offer photo plots with a resolution of up to 100,000 dpi and glass masters with 100,000 and 200,000 dpi.Coating process
Direct coating using our proven extremely stable high-resolution emulsions is carried out completely automatically. Direct-indirect coating is completed using presensitized films and matching emulsions. With all coating methods we achieve coating thickness tolerances of ± 1 µm.Quality Control
Even if the processes are optimally controlled and coordinated, extensive certified quality control is important for your production reliability.The positioning accuracy of the photo plots is regularly monitored with an accuracy of ± 1 µm by the 3D coordinate measuring machine, which directly installed in the clean room. This allows a timely reaction to changes even before screen exposure. Upon request, the positioning accuracy of the ready-to-print precision screens is also checked and a measurement protocol with the results is generated.
The conductor track widths can be measured using a stereo microscope with integrated camera system. The fabric and coating thicknesses are checked with an accuracy of ± 0,5 µm using a digital thickness measuring device.
Further details you will receive upon request.
