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Thread: Mesh Size

  1. #1
    Deepakvarma Guest

    Mesh Size

    HI,


    I have a simple yet important querry-

    If we have to replace a wire mesh used for sifting
    with a SS perforated screen, how is the diameter of
    the screen selected so as to obtain the same powder
    characteristics while using the wire mesh.

    For eg If I want to replace 20# how much mm perforated
    sieve should I use?

    With thanks and regards,

    ____________
    Deepak Varma

  2. Hello Mr. Deepak,

    I believe, you have the published data indicating the sieve number vrs. the aperture size. So, you can choose the perforation size accordingly.

    However, the screen cloth made of wires will have more screening area compared to perforated screen. This is in context of screening net space per centimeter square or inch square. The perforated screen has comparatively less net screening area, and hence its screening function will become less effective.

    In general wire cloth screens are good for fine screening where particle size is small enough not to damage the wire. The perforated screen will be good when it has to deal with bigger size of particle (lumps) which can damage the wire.

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyor.
    Email : parimul@pn2.vsnl.net.in
    Tel.: 0091 (0)20 5882916

  3. #3
    Deepakvarma Guest

    mesh size

    Hello Mr. Gulani,

    Thanks for your reply.
    I dont have any supporting data regarding comparative
    values of mesh size and apperture size as you mentioned.

    The only value I am having is a British standard specification
    stating that a 20# wire sieve should have an optimum
    apperture size( diameter,should be) of 0.84 microns.
    But this pertains only towire mesh .
    What about perforated screens? How much mm perforated
    screen should I use to replace a 20# wire mesh?

    Hoping you would enlighten me further,

    With Thanks and Regards,

    ____________
    Deepak Varma

  4. Hello Deepak,

    Presently, I have only following data about USA Tyler screen :

    Screen number 3, Opening size 0.371 inch (6.68 mm),
    Screen number 4, Opening size 0.185 inch (4.70 mm),
    Screen number 6, Opening size 0.131 inch (3.33 mm),
    Screen number 8, Opening size 0.093 inch (2.37 mm),
    Screen number 10, Opening size 0.065 inch (1.65 mm),
    Screen number 14, Opening size 0.046 inch (1.17 mm),
    Screen number 20, Opening size 0.0328 inch (0.84 mm, i.e. 840 microns),
    Screen number 28, Opening size 0.0232 inch (0.59 mm, i.e. 590 microns),
    Screen number 35, Opening size 0.0164 inch (0.42 mm, i.e. 420 microns),

    There could be different standards for the above, but possibly there may not be remarkable difference amongst them for mentioned screen size number.
    Coming to your specific query, as per my information you will not get perforated screen for screen size # 20 as it is very fine (very small) opening, and it may be difficult to make such screen.

    If need be, please refer to screen manufacturers for more specific information.

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyor.
    Advisor / Consultant for Bulk Material Handling System & Issues.
    Email : parimul@pn2.vsnl.net.in
    Tel.: 0091 (0)20 5882916

  5. #5
    Deepakvarma Guest

    mesh size

    Hello Gulani,

    Thanks for your reply.
    The info you have provided is almost what I am looking for.

    As per it,Screen 20 should have an apperture of 0.84mm as
    per US TYLER STANDARD.
    It matches the data I am having for the apperture size
    required for a 20# wire mesh which states 0.84 mm + - 5%.
    There is minor difference between standards.For eg in
    US TYLER the next screen is 28 while the one I am having
    mentions 30.

    The point remaining is that effective screening surface reduces
    for perforated screens for a comparative wire mesh.
    So what mm should I use to compensate this loss?

    Looking for further enlightment,

    With thanks and regards,

    ____________
    Deepak Varma

  6. #6
    Join Date
    Sep 03
    Posts
    20

    vibrating screen mesh

    Hello Mr. Deepak Varma,

    Concerning your inquiry about comparative production between wire steel mesh and punched ss sheets:
    -the selection under 1 mm. with punched sheets is very difficulty
    -the free screening surface is reduced comparated with wire steel mesh
    If you want to replace the wire steel mesh for wearing lifetime problem and you like to improve prouctivity please consider the elastic polyurthane anti clogging slotted mesh (realized with water jet process)

    Hoping to help you in your choice

    Regards

    A. MARIO
    Sales Mining Eng.

    Eurogomma

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