How a Screed Works
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2-3
Because the screed floats, it will not immediately react to a change
in the tow point. It needs a certain amount of time or distance to
make a correction in the mat thickness (Figure 2-4).
• If the tow point is changed by a unit of one, the paver must
move one tow arm length before the screed will correct 63% of
the elevation.
• After 2 tow arm lengths 83% of the correction is made and 3
tow arm lengths would account for 95%.
• It takes 6 tow arm lengths to achieve 100% of the elevation
change.
Considering that 95% of the change takes place after 3 tow arm
lengths, this can be used in practical applications to qualify for full
correction.
Figure 2-4. Tow Arm Travel
Tow Point Path
Tow Point Path
1 Tow Arm
Length Travel
2 Tow Arm
Lengths Travel
3 Tow Arm
4 Tow Arm
5 Tow Arm
6 Tow Arm
63%
87%
95%
98%99%100%
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Tow Point Path
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