|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Position
|
3rd Press
|
|
|
Uhle Box #
|
1
|
|
|
|
|
Fabric Width
|
|
|
|
Total Slot Width/Open Area
|
|
in^2
|
|
Fabric Speed
|
|
ft/min
|
|
Uhle Box Dwell Time
|
|
msec
|
|
Recommended Dwell
Time
|
2-4
|
ms/uhle box
|
|
VACUUM
CALCULATIONS
|
|
Vacuum
|
|
in Hg
|
|
|
|
|
Selected Pump
Capacity
|
|
cfm
|
|
Estimated Pump
Efficiency
|
|
%
|
|
Total Slot
Area
|
|
in^2
|
|
Uhle Box
Airflow
|
|
cfm/sq.in.
|
|
|
|
Recommended
Airflow
|
15-25
|
cfm/sq.in.
|
|
HERRINGBONE SLOT
CALCULATIONS
|
|
Slot Angle
|
|
degrees
|
|
Slot Size (S)
|
|
in.
|
|
Land Size (L)
|
|
in.
|
|
Pattern Width (W)
|
|
in.
|
|
Open Area per in.
of fab width
|
|
in^2
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
PERFORATED COVER
CALCULATIONS
|
|
|
|
|
Hole Diameter
|
|
in.
|
|
Hole Pitch
|
|
in.
|
|
No. of Rows
|
|
|
|
|
|
MD Length of
Perforation Zone
|
|
in.
|
|
Total Area Covered
by Holes
|
|
in^2
|
|
%Open Area of Cover
|
|
|
|
Holes / Sq. In.
|
|
|
|
Open Area per in.
of fab width
|
|
in^2
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|