Nip roller

[sornchai]

When checking the nip according to instruction manual, two cases are often found:
1. The ends of the roller are smaller than the center of the roller.
2. The ends of the roller are larger than the center of the roller.
I would like to know the cause of this. Thank you.

 

[Baconcrunchwrap]

if its smaller in the middle it's most likely worn from the web running on it wearing it down over time

 

[Cornishpastythighs]

When checking the nip according to instruction manual, two cases are often found:
1. The ends of the roller are smaller than the center of the roller.
2. The ends of the roller are larger than the center of the roller.
I would like to know the cause of this. Thank you.

One might be a 'crowned roller'
Crowned nip rollers in web offset printing are specialized rollers designed with a slightly larger diameter in the center than at the edges to compensate for roller deflection (bending) under load. This engineering technique ensures that pressure across the nip is uniform, preventing defects like center-wrinkling, web breaks,

 

[sornchai]

One might be a 'crowned roller'
Crowned nip rollers in web offset printing are specialized rollers designed with a slightly larger diameter in the center than at the edges to compensate for roller deflection (bending) under load. This engineering technique ensures that pressure across the nip is uniform, preventing defects like center-wrinkling, web breaks,

Thank you

 

[sornchai]

One might be a 'crowned roller'
Crowned nip rollers in web offset printing are specialized rollers designed with a slightly larger diameter in the center than at the edges to compensate for roller deflection (bending) under load. This engineering technique ensures that pressure across the nip is uniform, preventing defects like center-wrinkling, web breaks,

Thank you