water wringer rolls, oiler rolls, non-woven rolls and 3M Mill Rolls from JVM
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Technical Data of JVM Rolls
Roll outside-Ø: 35-1500 mm
Face (covering) length: max. 8000 mm
Hardness range: 30-100° Shore A
Nip (roll) pressure: max. 90 N/mm
Range of application: pH 0-14
Operating temperature: max. 150°C
Strip speed: max. 2000 m/min
Roll revolution: max. 2500 r.p.m.

Friction Values of JVM Rolls

Also for pinch (driving) and brake rolls, a higher and constant friction value is required, particularly in case the strip surface is wet or oily. Conventional rolls have low friction values even when they are new, and generally deteriorate significantly after short time of operation. JVM Rolls are perfectly suitable for these different tasks, regardless of the strip surfaces being dry, wet or oiled.

Comparison or Friction Factors, Data of the Friction Values in µ
   JVM Roll Rubber Coated Roll
Steel strip
Dry
Wet
Oily
0,52
0,44
0,36
0,36
-,-
0,01
Stainless steel strip
Dry
Wet
Oily
0,29
0,27
0,25
-,-
-,-
-,-
Aluminium strip
Dry
Wet
Oily
0,29
0,31
0,32
0,36
-,-
0,01
Copper strip
Dry
Wet
Oily
0,34
0,31
0,34
-,-
-,-
-,-
Brass strip
Dry
Wet
Oily
0,34
0,37
0,30
-,-
-,-
-,-
Note: Coefficients of friction measured with a strip guide of 180° (see schematic drawing)