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Thread: Developing Problem

  1. #1
    Member printr00t will become famous soon enough printr00t will become famous soon enough printr00t's Avatar
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    Developing Problem

    Hi
    how to check plate after developing that is to be good develop or poor develop.


    anybody suggest me...

  2. #2
    Donor Shap will become famous soon enough
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    Use a drop of Acetone

    I believe the "standard" method for verifying if a CTP plate is fully exposed and developed is to put a small drop a Acetone on a corner of the plate on an image-less area.
    After the liquid evaporates, there should be no noticeable "borders" of that vanished drop.
    Usually a very faint thin border is permissible, but darker borders indicate that there are traces of emulsion on the areas of the plate, that should have come out clean.
    Assuming that the plate exposure is OK and the developer solution is new or in good working order, and there are still traces of emulsion, the remedy is to increase processing (slower machine speed and/or higher temperature for the developer).
    This is probably typical to over-dated CTP plates.
    Good luck.

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  4. #3
    Donor eflatun is on a distinguished road
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    Quote Originally Posted by printr00t View Post
    Hi
    how to check plate after developing that is to be good develop or poor develop.


    anybody suggest me...
    more detail, better help;
    photopolymer,silver,thermal,conventional ? positive, negative ?

  5. #4
    Member BeerMan will become famous soon enough BeerMan will become famous soon enough
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    Quote Originally Posted by printr00t View Post
    Hi
    how to check plate after developing that is to be good develop or poor develop.


    anybody suggest me...
    Usually use scale and metering equipment.
    Example: _http://wpc.ilatec.com/wpcinfo63ctp.html

    Good luck

  6. #5
    Member print2011 will become famous soon enough
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    Quote Originally Posted by Shap View Post
    I believe the "standard" method for verifying if a CTP plate is fully exposed and developed is to put a small drop a Acetone on a corner of the plate on an image-less area.
    Good luck.
    +1000000

  7. #6
    Member printr00t will become famous soon enough printr00t will become famous soon enough printr00t's Avatar
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    Quote Originally Posted by Shap View Post
    I believe the "standard" method for verifying if a CTP plate is fully exposed and developed is to put a small drop a Acetone on a corner of the plate on an image-less area.
    After the liquid evaporates, there should be no noticeable "borders" of that vanished drop.
    Usually a very faint thin border is permissible, but darker borders indicate that there are traces of emulsion on the areas of the plate, that should have come out clean.
    Assuming that the plate exposure is OK and the developer solution is new or in good working order, and there are still traces of emulsion, the remedy is to increase processing (slower machine speed and/or higher temperature for the developer).
    This is probably typical to over-dated CTP plates.
    Good luck.
    thanks for your best solution....
    I tried it and i think, this is very useful way to analyze the CTP Plate. Great Brother

  8. #7
    Junior Member Pavlo is on a distinguished road
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    Quote Originally Posted by printr00t View Post
    Hi
    how to check plate after developing that is to be good develop or poor develop.


    anybody suggest me...
    Developed for photopolymer plate you can check the PH. PH must be 12 + -0.3. Some types of thermal developer can check the conductivity

  9. #8
    Junior Member aerol is on a distinguished road
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    You should use a plate reader Xrite's[URL="http://www.xrite.com/product_overview.aspx?Action=support&ID=796"] iCPlate2[/URL] or Techkon's[URL="http://www.techkon.com/en/spectroplate.html"] SpectroPlate[/URL] and there is UGRA/FOGRA [URL="http://www.ugra.ch/digital-plate-control-wedge.phtml"]digital plate control wedge[/URL] and/or [URL="http://www.ugra.ch/offset-plate-control-wedge-1982.phtml"]Offset plate control wedge[/URL] where you can measure the dots.

    If the measured values are in the tolerance (+/- 2%) the developing is ok but as Shap mentioned before the "aceton-test" is a good way to check that everything is ok.

  10. #9
    Junior Member pioupiou is on a distinguished road
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    Good morning.
    I think the principle is to edit a line with the CTP and then measured with a spectrodensitometer.

  11. #10
    Junior Member Cyan is on a distinguished road
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    quality control process is a fundamental step and require analysis: Thermal, Violet, processless or chemical, kind of developer etc.

    For a classical "Thermal+chemical" combo, Acetone for nails, an "handy made" control wedge and Spectroplate (imho the best istrument on the market) is enoght for a *basic* qc.

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  13. #11
    ndoring10
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    Solution

    If you don't have specytometer you can try following... trow away existing developer, wash the whole machine, change the filter... than fill the new developer... you can develop the plate few seconds longer... if this doesn't help, try to adjust more pressure on the brush... that can help... if you use chinese plates developing will take some bit longer... also look onto water section... in some cases water can fill up the water section and then overflow to developer section... and reduce the strength of the developer... that can cause your problem...

  14. #12
    PRC Member peto31 is on a distinguished road
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    Quote Originally Posted by ndoring10 View Post
    If you don't have specytometer you can try following... trow away existing developer, wash the whole machine, change the filter... than fill the new developer... you can develop the plate few seconds longer... if this doesn't help, try to adjust more pressure on the brush... that can help... if you use chinese plates developing will take some bit longer... also look onto water section... in some cases water can fill up the water section and then overflow to developer section... and reduce the strength of the developer... that can cause your problem...
    yes this is very good solution

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