DISCUSSIONS

Die vs roller diameter

Dear all,

I got a question which i would like to throw in the group;

I know a plant where the sizes of the die/rollers used are as follows

Dies;

inside diameter = 52 cm
outside diameter= 62 cm
Width (contact with rollers) = 14 cm
Width die = 18 cm

Rollers: outside diameter = 24 cm
outline = 77.5 cm

However we do not achieve a good capacity with this press, even while we are using formulations which are running smoothly in other mills. We noticed low amperes mostly, but these switch to very high amperes at sudden but frequent intervals, causing us to have to reduce load and thus reducing capacity.

Could the problem be related to the diameter ratio between rollers and die? or might the manufacturor of the dies be selling dies with badly drilled holes?

With thanks for your answers,


W

Comments

  • edited November -1
    Dear all,

    I got a question which i would like to throw in the group;

    I know a plant where the sizes of the die/rollers used are as follows

    Dies;

    inside diameter = 52 cm
    outside diameter= 62 cm
    Width (contact with rollers) = 14 cm
    Width die = 18 cm

    Rollers: outside diameter = 24 cm
    outline = 77.5 cm

    However we do not achieve a good capacity with this press, even while we are using formulations which are running smoothly in other mills. We noticed low amperes mostly, but these switch to very high amperes at sudden but frequent intervals, causing us to have to reduce load and thus reducing capacity.

    Could the problem be related to the diameter ratio between rollers and die? or might the manufacturor of the dies be selling dies with badly drilled holes?

    With thanks for your answers,


    W
    Dear MR Wouter..
    the dies quality is focus on
    1. holes condition..
    by gun drill the process speed is very important to cause smooth surface. if the drill speed is less than 12000rpm it is very easy to block in dies if pellet less than 2mm.
    2. hardness normally the hardness must control under 54HRC.
    3. holes inlet gorrve. if this wear out will cause the amper rise.
    4. impurity block holes cause material no way to pass smoothly.
    5. pellet mill bearing damaged cause shaft jumping.
    6. inner and outter scraper wear out cause material guiding failure.

    roller..
    1. roller wear out.
    2. roller to dies kept distance to much.
    3. roller hardness too soft.
    4. open and close end roller match mistake.

    formulation..
    1. fat contain
    2. moisture.
    3. starch.
    4. ash..

    The easy way is change a new dies and roller to compare the variation between each.
    and trial to modify formula.

    for more information please contact to me..
    <!-- e --><a href="mailto:younder2000@yahoo.com">mailto:younder2000@yahoo.com</a><!-- e -->
    younder.

    6.
  • edited November -1
    Given that the mechanics are OK. Firstly you should look at die speed and conditioning.. There are so many variables but these would be the first things to check..
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