Bungard COTHERM 2,2 W/MK 1X 35#M CU 150X250X1,5 161156E38 Manual Do Utilizador
Códigos do produto
161156E38
Bungard Presensitized Base Material
Manual
page 1 / 4
Equipment
Yellow light or dim light is recommended.
You need:
Yellow light or dim light is recommended.
You need:
•
An exposure machine like the Bungard HELLAS
•
A developing tray
•
An etching machine / etching cuvette
•
A thorough black, high-contrast positive film
•
1 liter of water (approx. 20 ° C)
•
1 bag Bungard special developer
•
Water for rinsing
•
Paper towels to dry the plate
Exposure:
The photoresist reproduces positive with a maximum spectral
sensitivity of approximately 400 nm.
Remove protective foil. Align layout. Exposure is carried out
layer by layer, that is, the colour / toner side of the film should
come to rest on the board, in order to minimize exposure
undercut. Layout must lay snug and free of bubbles (ideally
pressed on by vacuum). Exposure time with Bungard HELLAS
approximately 120 s. With other devices we recommend to find
best exposure time with a step test.
The photoresist reproduces positive with a maximum spectral
sensitivity of approximately 400 nm.
Remove protective foil. Align layout. Exposure is carried out
layer by layer, that is, the colour / toner side of the film should
come to rest on the board, in order to minimize exposure
undercut. Layout must lay snug and free of bubbles (ideally
pressed on by vacuum). Exposure time with Bungard HELLAS
approximately 120 s. With other devices we recommend to find
best exposure time with a step test.
Step test for optimum exposure time:
remove a narrow strip of the protective foil from the pcb and expose
20s. Remove another strip of foil and repeat n-times. This way you
remove a narrow strip of the protective foil from the pcb and expose
20s. Remove another strip of foil and repeat n-times. This way you
get a board, whose final stage is 20 seconds exposed and the first
stage, however, was exposed n x 20 seconds.
If now for example the 5th stage properly develops in less than 1
stage, however, was exposed n x 20 seconds.
If now for example the 5th stage properly develops in less than 1
minute, the minimum exposure time is on your device 5 x 20 = 100
seconds. Add a safety margin of 1 stage, you have the optimum
exposure at 120 seconds.
Development
Completely dissolve by stirring a bag of Bungard special
developer in 1 liter of water (approx. 20 ° C).
Pour developer in cuvette, so that the pcb will just be covered.
Slide pcb softly into the cuvette. The colour of the resist should
directly change colour at the exposed areas. Carefully rock the
liquid, do not rub the resist.
After 60 s rinse pcb with tab water.
Completely dissolve by stirring a bag of Bungard special
developer in 1 liter of water (approx. 20 ° C).
Pour developer in cuvette, so that the pcb will just be covered.
Slide pcb softly into the cuvette. The colour of the resist should
directly change colour at the exposed areas. Carefully rock the
liquid, do not rub the resist.
After 60 s rinse pcb with tab water.
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: +49 (0) 2292/5036, Fax: +49 (0) 2292/6175, E-mail: support@bungard.de