CUTTER BLADE

SELECTION

AND USE

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:

SC-5 Sure Cut

Bushing

Knife Cut Path

Knife Cut Path

Model

Diameter

Diameter

Circumference

5

2.25"

28"

87.9"

 

3.25"

29"

91.1"

 

4.25"

30"

94.2"

 

5.25"

31"

97.3"

 

2"x4"

28"

87.9"

 

2"x6"

28"

87.9"

 

2"x8"

28"

87.9"

 

2"x10"

28"

87.9"

 

3"x6"

29"

91.1"

 

4"x7"

30"

94.2"

As an example, calculate the blade interruption (in millisec- onds) for an SC-5 cutter running 1/4 inch (0.250 inch) OD tubing. The blade speed is 718 rpm and the cutting blade is 15/16 inch (0.937 inch) width at the point where it passes through the extrudate, and the cut path circumference is 87.9" for the SC-5.

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

B-4 APPENDIX

CUTTER BLADE SELECTION AND USE

UGE059/1003

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Conair SC-5 manual Calculating Blade Interruption

SC-5 specifications

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