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Sizing POB
Brake for Unwind Tension Control
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INPUT
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Enter Tension
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pli
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(see chart below if needed)
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Roll Diameter:
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in.
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Web width
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in.
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Core diameter
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in.
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Web (Linear) Speed
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ft/min
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CALCULATED RESULTS
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Tension
Value Chart
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Foil .001 inches thick
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1
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Foil .002 inches thick
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2
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Tension
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pli
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Mylar .0005 inches thick
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0.25
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Mylar .001 inches thick
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0.75
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Maximum Torque
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lb ft
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Mylar .002 inches thick
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1.5
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Polyethylene .001 inches thick
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0.25
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Slip RPM (at full roll)
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rpm
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Polyethylene .002 inches
thick
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0.5
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Acetate .0005 inches
thick
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0.25
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Heat Dissipated
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W
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Acetate .001 inches
thick
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0.5
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Acetate .002 inches
thick
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1
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Maximum RPM
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rpm
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Polystyrene .0005 inches thick
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0.5
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Polystyrene .001 inches thick
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1
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Polystyrene .002 inches
thick
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2
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Cellophane .001 inches
thick
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0.5
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Wax Paper .001 inches
thick
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1
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The
proper size brake must....
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Wax Paper .002 inches thick
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2
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Newspaper .002 inches thick
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0.25
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have
sufficient torque
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Newspaper .003 inches thick
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0.75
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be able to
dissipate the heat
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Kraftpaper 0.005 inches
thick
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1.5
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not run
above rated speed
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Kraftpaper 0.01 inches thick
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4
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Paperboard 8 pt.
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3
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Paperboard 12 pt.
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4
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The
following brakes meet your specifications:
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Paperboard 15 pt.
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5
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Paperboard 20 pt.
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7
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Paperboard 25 pt.
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9
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Paperboard 30 pt.
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1
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Paper 15 lbs./ream
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0.5
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Paper 20 lbs./ream
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0.75
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Paper 30 lbs./ream
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1
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Choose
the smallest from above and verify on graphs below
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Paper 40 lbs./ream
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1.5
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Paper 60 lbs./ream
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2.5
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Paper 100 lbs./ream
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4
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Sizing
Brake for Cycling or Controlled Starting or Stopping
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INPUT
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Enter Tension
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pli
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(see chart above if needed)
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Roll Diameter:
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in.
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Web width
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in.
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Core diameter
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in.
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Web (Linear) Speed
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ft/min
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Roll Weight:
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lbs.
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Time to stop the
load
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s
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CALCULATED RESULTS
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Tension
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pli
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Torque (due to unwinding)
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lb ft
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Slip RPM (at full roll)
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rpm
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Heat Dissipated
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W
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Maximum RPM
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rpm
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Inertia
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lbft^2
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Torque (due to
inertia)
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lb ft
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(controlled
deceleration conditions)
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Limiting torque
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lb ft
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The
proper size brake must....
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have
sufficient torque
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be
able to dissipate the heat
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not
run above rated speed
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The
following brakes meet your specifications:
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Choose
the smallest from above and verify on graph below
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