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Conformal Coating Application Techniques

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All of the facts for installation and use in production for today’s conformal coatings

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    Presentation Transcript

    1. Slide 1: Conformal Coating Application Techniques All of the facts for installation and use in production for today’s conformal coatings  
    2. Slide 2: Coating Application • A close look at all coating techniques – What the process is? – How they impact on production? – Their typical capital and running costs ? – How processes integrate with the new conformal coating materials?
    3. Slide 3: Possible coating application methods!
    4. Slide 4: Coating Application Techniques • Dip • Spray – Aerosol / hand spray • Brush • Selective Spray • Vapour Deposition
    5. Slide 5: Dip Coating • Typical System
    6. Slide 6: Dip Coating • Process – PCBs hung on arm – Boards lowered into dip tank containing coating – Immersion <12” min. Minimises entrapment – Dwell time. For penetration. – Withdrawal 3-6”/min. Controls thickness. – Can dip horizontal or vertical
    7. Slide 7: Dip Coating • Advantages – Coating penetrates under components – Coating is applied to both sides – Coating thickness is assured – Can be extremely fast process – Low skilled process in application
    8. Slide 8: Dip Coating • Disadvantages – Where intensive masking can be skilled process – Inflexible for coating change – Thin tip coverage is an issue (see next slide)
    9. Slide 9: Dip Coating • Thin Tip Coverage Single Dip - Possibility of Sharp Edges being exposed Double Dip Solves this Problem
    10. Slide 10: Dip Coating • Capital Costs & Process Capability – Capital investment low – Running costs low – Masking costs may be significant – Low skilled process
    11. Slide 11: Dip Coating • Compatibility – Suitable for all solvent & water based coatings – Unsuitable for UV cure – Can handle some moisture cure products – Can be suitable for silicone coatings
    12. Slide 12: Spray Coating • Typical System
    13. Slide 13: Spray Coating • Process – Aerosol or spray gun – Material is diluted and sprayed – Multiple passes each at 90 degrees and multiple coats – Spray assembly horizontally with spray gun at around 45 degrees – Keep humidity >40% and <60%
    14. Slide 14: Spray Coating • Advantages – Two-part Materials may be used – Flexibility for alternate materials –Reduced masking: shield v barrier –Easier/Better tip and edge coverage
    15. Slide 15: Atomised Spray Good Sharp Edge Coverage
    16. Slide 16: Spray Coating • Disadvantages – Less penetration under components – 3D shadow effects can limit – Multiple layers required – Semi-skilled process
    17. Slide 17: Spray Coating • Capital Costs & Process Capability – Capital investment low – Running costs low – Masking costs could be significant – Semi-skilled process – Capable of >1000 PCBs / week.
    18. Slide 18: Spray Coating • Compatibility – Suitable for all conformal coatings if viscosity can be lowered to a suitable level (<300 cps)
    19. Slide 19: Brush Coating • Process – Keep the brush “loaded” from pot – Thin coating (10%) for levelling – Flow the coating - DO NOT PAINT! – Use high quality solvent resistant brushes
    20. Slide 20: Brush Coating • Advantages – Suited for low volume – Excellent for repair & rework – Extremely low cost!
    21. Slide 21: Brush Coating • Disadvantages – Volume work very expensive! – Can be slow on large boards – Quality of finish can be questionable – Thick coating applied
    22. Slide 22: Brush Coating • Capital Costs & Process Capability – Capital investment very low! – Running costs low – Labour costs could be significant – Repeatability may be an issue – Semi-skilled process – Capacity staff dependent!!!
    23. Slide 23: Brush Coating • Compatibility – Suitable for all conformal coatings if viscosity can be lowered to a suitable level (<100 cps)
    24. Slide 24: Selective Coating • Typical System
    25. Slide 25: Selective Spray • Process – XYZ & Φ platform – Spray valve(s) of various designs – Program valves through software
    26. Slide 26: Selective Spray • Advantages – Maximises throughput – Minimises masking – Automates and conveyorises the production – Minimises Labour costs – Highly controlled process
    27. Slide 27: Selective Spray • Disadvantages – May require masking – Limitations on coating application (connectors) – Skilled Process to operate & program – Limitations in 3D spraying
    28. Slide 28: Selective Spray • Capital Costs & Process Capability – Capital investment high – Running costs low – Skilled process in programming – High volume capacity dependent on valve
    29. Slide 29: Selective Spray • Compatibility – Suitable for all conformal coatings if viscosity can be lowered to a suitable level (<250 cps)
    30. Slide 30: Vapour Deposition • Process – Material is applied under a vacuum and is converted from gaseous monomers to a layer of dimerised material
    31. Slide 31: Vapour Deposition • Advantages – Extremely good protection – Uniform coverage
    32. Slide 32: Vapour Deposition • Disadvantages – By nature it is a batch process – Masking MUST be 100% – Extremely costly
    33. Slide 33: Vapour Deposition • Capital Costs & Process Capability – Capital investment very high – Running costs high – Skilled process in masking – Low volume capacity
    34. Slide 34: Vapour Deposition • Compatibility – Unsuitable for all conformal coatings
    35. Slide 35: Summary of Results Method Process Skill Capital Costs Throughput Compatibility Dip Low Low High Most Spray Semi Low Medium All Brush Semi Very Low Low All Selective Spray Low High High All Vapour Deposition High Very High Low None
    36. Slide 36:    Whatever issues you currently have we can  certainly help and are available to offer advice  however complex. SCH Technologies www.conformalcoating.co.uk

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