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Thread: Varnishing blanket

  1. #1
    Banned Algis is on a distinguished road
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    Varnishing blanket

    Hi everyone,

    Can someone help me? Please.

    How do I calculate the distortion factor when plotting partial varnishing blanket?

    I'm using Package designer 2013 and the standart scale factor is wrong.
    I can calculate it by inserting cylinder D and thickness of varnishing blanket, but I don't have the abilty to disassemble the printing machine and measure it..

    Printing machine: Heidelberg SpeedMaster 102

    Does anyone already plots their varnishing blankets? Maybe you can provide me with more information?

    Photo: [IMG][URL=http://s1308.photobucket.com/user/algirdasbab1/media/Varnishingblankethelp_zps6f4cdc66.jpg.html][/URL][/IMG]

  2. #2
    Banned stradivarious is a splendid one to behold stradivarious is a splendid one to behold stradivarious is a splendid one to behold stradivarious is a splendid one to behold stradivarious is a splendid one to behold stradivarious is a splendid one to behold stradivarious is a splendid one to behold
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    I have never used this software, but maybe in youtube you can find a good solution. luck!

  3. #3
    Banned frknight is on a distinguished road
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    formula to calculate the distortion factor

    Dear,

    I used the following formula for the distortion factor calculation:

    a = length of the blanket
    b = blanket thickness
    C = circumference of cylinder with blanket
    D = diameter of the cylinder
    D2 = diameter of the cylinder and blanket

    a ÷ pi = D

    D + (2b) = D2

    D2 x pi = C

    a ÷ C = distortion factor

    this a long the y axes, there is also distortion for x axes if you got it kindly share.

    Best Regards
    frknight
    Last edited by frknight; 09-15-2014 at 02:15 AM.

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  5. #4
    Banned Algis is on a distinguished road
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    Formula to count the Distortion factor

    I've investigated this further and found more info.

    This is for counting Flexo printing distortion.

    It works here also , but only when we have the correct diameter of cylinder (on which we mount the varnishing plate).

    Counting form the blank length is incorrect because the plate is fixed in the cylinder by clamps, not glued on the surface! Clamps takes about 17% of the cylinder surface.

    Also when you'll get your cylinders diameter, you should add the double thickness of the dekel (material placed on the cylinders surface) A

    I've have found that you have to measure varnishing plates thickness without the base material. B

    Then the math is simple: [A-(2B)]/A

    The result is the same as the Package designers calculator (where you have to add Cylinder diameter and rubber thickness)

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  7. #5
    Banned Algis is on a distinguished road
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    No more updates in counting the distortion factor?

    C'mon, does nobody uses plotters to cut their Varnishing blankets?

    Also which blankets do you use?

  8. #6
    Junior Member Roman is on a distinguished road
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    For the Heidelberg SpeedMaster 102 the vertical stretch coefficient is 0.9845

    You should test it on your own rubber blank.

  9. #7
    Donor zooz82 will become famous soon enough
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    I use the Package designer since 2011 till now with package designer 2016.

    You should go to your printing machine and check the in the cp2000 the manual and go to the coating Unit, and the check for the diameter of the cylinder, then check the thickness under the blanket, and then go to package designer and write the two values when you create varnish blanket.

    done.

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