FAQ
What information is required to quote a custom nonwoven mill roll?
Please provide the roll application and line position, strip material and width, finished outside diameter, face length, cover thickness, shaft or core drawing, line speed, roll RPM, nip pressure or line load, process liquid, pH, temperature, and the required wringing, oil-film, or traction result. An existing roll specification or dimensioned drawing is also helpful.
How do you select the nonwoven grade, density, and hardness?
The nonwoven grade, density, and hardness are selected together according to the roll function, strip surface, process liquid, operating temperature, line speed, nip pressure, and required residual liquid or traction. There is no single hardness suitable for every application. When replacing an existing roll, the verified original grade and operating data should be reviewed first.
What operating data is needed for a wringer or de-oiling roll?
Important operating data includes the liquid type, viscosity or concentration, pH, temperature, and filtration condition, together with the strip material, thickness and width, line speed, nip pressure or line load, and the required residual moisture or oil film. Existing problems such as edge wetness, liquid carryover, slippage, or uneven wringing should also be identified.
Does the roll require crowning or dynamic balancing?
Crowning and dynamic balancing requirements depend on the roll face length, shaft and core construction, bearing support, applied line load, operating speed, and allowable runout. Crowning may be required to compensate for shaft deflection and maintain uniform nip pressure across the roll face. The required balance grade should be confirmed from the machine speed and equipment specification.
Can an existing roll be reproduced from a drawing or sample?
Yes. We can manufacture a replacement nonwoven mill roll from a dimensioned drawing, existing specification, or measured sample. Before production, we confirm the finished diameter, face length, cover construction, shaft and journal dimensions, mounting interfaces, hardness or density, surface finish, and operating conditions.
Can a worn nonwoven mill roll be reground, repaired, or recovered?
Yes. We can evaluate worn nonwoven mill rolls for regrinding, local repair, or recovering. The appropriate method depends on the damage depth, remaining diameter, cover construction, shaft and core condition, required surface finish, and dimensional tolerance. The roll must be inspected before the repair method is confirmed.
What causes uneven wringing or short roll life?
Common causes include excessive or insufficient nip pressure, an unsuitable nonwoven grade, operation outside the specified temperature or pH range, contaminated or poorly filtered liquid, incorrect crowning, shaft deflection, uneven surface finish, and line speed outside the roll's design conditions. The operating data and wear pattern should be reviewed before changing the pressure or roll specification.