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  1. #1
    erik ok's Avatar

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    Jun 2007
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    Default 45 LPI halftone with veg oil?

    So ive been through three screens of step exposures trying to get a 45 lpi halftone using the following—

    230 yellow mesh on a 30x40 frame
    QTX
    2 500 watt halogen utility lamps
    veg oil bond postives
    total image area of 18"x24"
    distance from lamps to stencil is double the diagonal of the image area—so about 58"

    Im wondering if I am fighting a losing battle trying to get this kind of LPI with halogens and oiled positives. the halftone is damaged by the washout proccess even with 25 min. burn times. whatch'yall think?

  2. #2
    slakow's Avatar

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    Default

    Ha ha ha ha!
    Forget abaut this vegeterian method!
    For halftones you need extremly good (dark) positives.

  3. #3
    IVARTON's Avatar

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    Default

    Use Vag oil instead.

  4. #4
    HYNES's Avatar

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    Default

    Quote Originally Posted by erik ok View Post
    So ive been through three screens of step exposures trying to get a 45 lpi halftone using the following—

    230 yellow mesh on a 30x40 frame
    QTX
    2 500 watt halogen utility lamps
    veg oil bond postives
    total image area of 18"x24"
    distance from lamps to stencil is double the diagonal of the image area—so about 58"

    Im wondering if I am fighting a losing battle trying to get this kind of LPI with halogens and oiled positives. the halftone is damaged by the washout proccess even with 25 min. burn times. whatch'yall think?

    its absolutely possible to get decent halftones with the oil/bond paper method smaller even than 45 lpi. toner on the bond paper will need to be as dark as possible.

    I know nothing about times for halogens etc but ive had best results with lights almost directly against the screen and doing a quick flash exposure, you'd probably need to experiment with times with your light setup but at 58" away i think you'll have better luck going closer - your exposure time should come down too.

  5. #5
    squeegeethree's Avatar

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    Dec 2006
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    Default

    half the distance from your 58". But really try out some film for the results you need.

  6. #6
    erik ok's Avatar

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    Default

    i loaned out my screenprinting today book and forgot the light to stencil ratio...

  7. #7

    Default

    It really shouldn't have... but this made me laugh pretty hard.


    Quote Originally Posted by IVARTON View Post
    Use Vag oil instead.

  8. #8
    necro's Avatar

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    Default

    Quote Originally Posted by skot View Post
    It really shouldn't have... but this made me laugh pretty hard.
    yeah..me too

  9. #9
    Premium Member
    Andymac's Avatar

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    Aug 2003
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    Default

    try about 36"

    if the stencil is washing off, up the time

    if the stencil is staying, but the image is not washing, drop the time.

    going from 58" down to 36", you time will have to come down....

    I'm not going to comment on the oiled paper...ecept to say 80 grit and SAE 30
    Andymac

    services www.squeegeeville.com
    equipment www.tmiscreenprinting.com

    Todo es empezar.

  10. #10
    erik ok's Avatar

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    Default

    thanks guys!

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