imagecureSMART® XV501T-4 - Coates Screen

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imagecureSMART® XV501T-4 LDI SCREEN5) PRE-CLEANEnsure that all copper surfaces are completely clean, tarnish free and dry prior to applying imagecureSMART®. Forpanels that are badly oxidised and tarnished then a micro-etch prior to mechanical pre-cleaning is recommended. Themicro-etch should be capable of removing any oxide or tarnish staining and of thoroughly rinsing and drying the panelbefore being mechanically cleaned.Mechanical pre-cleaning is recommended as follows: -Brushing280 - 400 grit silicon carbide brushes are recommended having a footprint on the copper of 8 - 15mm.(0.3 - 0.6 in). The water rinse and heater sections should be capable of thoroughly rinsing and drying thepanels such that no water is left in the holes or between closely spaced conductors and that moisture ortarnish is not present on the freshly brushed panels.It is important that each brush is regularly checked and dressed as necessary to ensure optimumefficiency during use.Please note that Nylon brushes of 600 - 800 grit can also be used.PumicePumice or Aluminium oxide slurry of between 12 - 18% is recommended with an optimum of 15%. Thewater rinse and heater sections must be capable of rinsing and drying the panels such that residualpumice particles are completely removed and that no water is left in the holes or between closely spacedconductors and that moisture or tarnish is not present on the freshly cleaned panels.Microetch Where panels have close track/gap configurations, which may not be suitable for mechanical precleaning,the use of a “deep etching“ micro etch chemistry is recommended. It is recommended that each userensures that the Imagecure product is compatible with the particular micro-etch used and all subsequentmetal finishing processes.Surface roughness figures of :-Ra 0.2 - 0.4µm.R delta q 4 - 9ºwould be considered to be optimum values for copper surfaces pre-cleaned as above. A minimum Ra of 0.2µm. withan R delta q value of >4º is recommended (optimum R delta q values 7 - 9º).Please refer to separate technical document on surface roughness for a fuller explanation of the above roughnessvalues.NOTE. It is recommended that all freshly cleaned panels are coated with imagecureSMART® XV501T-4 within amaximum time of 2 - 4 hours. The actual maximum time will vary depending upon ambient temperature and humidity.Panels left longer than 4 hours before coating should be pre-cleaned again.T227/3 Page 4 of 10 January 2005
imagecureSMART® XV501T-4 LDI SCREEN6) PRINTINGFor optimum performance, screen print through a 43T/cm. (110TPI) polyester mesh for 0.5 or 1.0 oz. copper tracks.For improved encapsulation at higher plating thicknesses, a 32T/cm. (80TPI) mesh may be required.For best results, a 70 - 75° Shore squeegee, angled at 10 - 15° (from vertical) is preferred.Print tests with subsequent micro-sections are recommended to ensure adequate track encapsulation.All screens must be cleaned and thoroughly dried before use and free from residues of screen cleaner and ink.7) WASHING UPA range of specially formulated screen cleaners are available.8) PRE-DRYimagecureSMART® XV501T-4 LDI has a wide process window, meaning tack-dry temperature and times can betailored to a specific process. The following data can be used as a guide:For Batch ovens: -Side 1:Side 2:10 minutes at 75 - 80°C (167 - 176°F).30 - 40 minutes at 75 - 80°C (167 - 176°F).The maximum drying time (Side 1 + 2) should not exceed 45 minutes at 80°C (176°F).The recommended air velocity across the panels is > 1m/s, and they should be racked at least 30mm - 40mm. (1.2” -1.6”) apart.Because of the extreme photosensitivity of this material, it is recommended that the panels be allowed to cool either ina yellow light area or a darkened room (with controlled temperature and humidity). It is recommended that all panelsbe exposed and developed within 24 hours. If the humidity increases above 60% RH then the storage time of thedried panels will be reduced.Please note that due to the varying efficiency of some ovens, drying tests should be conducted to ensure optimizeddrying.T227/3 Page 5 of 10 January 2005
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imagecureSMART® XV501T-4 - Coates Screen

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