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C
UTTER
B
LADE
S
ELECTION AND
U
SE
UGE048/1103
B-4
A
PPENDIX
C
UTTER
B
LADE
S
ELECTION
AND
U
SE
Calculating Blade Interruption
Blade interruption
is the length of time which the blade
interrupts the extrudate during the cutting process. Knowing
blade interruption allows you to optimize blade speed and
design for specific applications.
You can calculate blade interruption for your application if
you know:
●
the cutting blade width
●
blade speed (cutter rpm)
●
extrudate cross section.
The rotary knife cut path circumference is fixed for each cut-
ter model:
CSC
Bushing Knife Cut Path Knife Cut Path
Model
Diameter
Diameter
Circumference
2L
1.25"
14"
44.0"
2
2.25"
14" 44.0"
3L
2.25"
15"
47.1"
3
2.25"
15"
47.1"
4L
3.25" 14" 44.0"
4
4.25"
14"
44.0"
5
5.25" 15"
47.1"
As an example, calculate the blade interruption (in millisec-
onds) for an CSC2 cutter running 1/4" (0.250") OD tubing.
The blade speed is 718 rpm and the cutting blade is 15/16"
(0.937") width at the point where it passes through the extru-
date, and the cut path circumference is 44.0" for the CSC2.
Calculate the blade interruption time. The interruption time
starts when the blade makes its first contact with the extrudate
and ends when the blade is totally clear of the product (i.e. no
longer interrupting it). Because we know the blade travel
speed, we can calculate the interruption time if we know how
far the blade travels during period of interruption. This dis-
tance is equal to the sum of the extrudate outer diameter and
the blade width at the point of contact.
Blade interruption = (Product OD + Blade width) X 60,000
time, msec
Knife circumference rpm