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  1. artkul

    Air permeability of paper

    Alright, I see. Well, I tried to apply powder on to a paper sheet, it is really hard to get an even distribution but bulging is not an issue, we prestress the paper in biaxial clamps. Now we will make a controlled pressure chambers and see how this works. We are also thinking about smoke we just...
  2. artkul

    Air permeability of paper

    Thank very much indeed! Yes we need a relative measurement only. A multi-celled grid is an expensive solution. We calculated the price - we cannot afford it. (Those pressure sensors are bloody expensive!) Using powder is an interesting idea indeed! I will try it. Could you please explain the...
  3. artkul

    Air permeability of paper

    Thank you, btrueblood! You are right! I am looking for a cheaper solution. There are ANSI standards to measure permeability but they are all designed for relatively large area and cannot capture 1 cm variations. The method you suggested is a way to go. Someone is already doing this actually but...
  4. artkul

    Air permeability of paper

    Hello everyone, I am looking for a way to capture a variation in air permeability in light paper grades. So we apply the pressure difference on two sides of a paper sheet but how to capture non-uniformities in through-paper flow on 1 cm scale? Does anyone know a suatable experimental technique...

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