Roll & Nip ALIGNMENT, INSPECTION, REVERSE ENGINEERING
For Paper Mills, Film & Foil Converters & Web Process Maintenance Teams
Cross-machine caliper variation, nip non-uniformity, coating weight streaks, and tension problems that change shift to shift — the root cause is often in the geometry of the rolls themselves. Scanning documents exactly what that geometry is, at every point across the face, without removing the roll from the machine.
We capture roll surface profiles, crown variation, nip pair geometry, frame alignment, and bearing housing positions at 0.025mm (0.001") accuracy. A complete picture of the roll surface — not a sampled set of discrete measurements — in a single session. Carry-in equipment, battery-powered, deployed on the machine floor without shutdown. We travel throughout the Southeast and nationally for larger projects.
Service Listings
Roll Surface Profile Scan — Crown, Taper & Wear Documentation
Roll surface geometry captured at full face length — crown profile, end taper, wear flat locations, and surface runout documented at 0.025mm accuracy. Delivers a complete surface map rather than discrete diameter measurements at sampled stations. Crown variation, localized wear flats, out-of-round conditions, and taper from end to end are all visible simultaneously. Used to make grind or replace decisions on press rolls, size press rolls, calendar rolls, and coating backing rolls — with objective data rather than operator judgment about surface condition.
From $1,200
Est. per roll
Nip Geometry & Cross-Machine Parallelism Scan
Both rolls in a nip pair scanned to document the spatial relationship between roll faces across the full web width. Nip parallelism, the relative crown profile of the two rolls, and the geometry of the nip loading zone are all captured in a single session. Used when nip non-uniformity is causing cross-machine basis weight variation, caliper streaks, coat weight distribution problems, or lamination bond strength variation that can't be resolved by conventional crown measurement. Applicable to calendar nips, press nips, laminating nips, and coating stations.
From $1,400
Est. per nip station
Frame & Bearing Housing Alignment Scan
Machine frame, side frames, and bearing housing positions scanned to document actual roll centerline positions and cross-machine alignment relative to the machine centerline and cross-direction reference. Used when persistent cross-machine variation in sheet properties can't be explained by roll surface condition alone, or when a frame has been repaired, shimmed, or modified and the roll positions need to be verified. Identifies frame distortion, bearing housing wear, and cross-machine misalignment that accumulates over years of production.
From $1,600
Est. — contact for quote
Worn Roll Reverse Engineering — Replacement Geometry
Worn or damaged rolls scanned for replacement fabrication geometry when original drawings are unavailable. Journal dimensions, face length, crown specification, end geometry, and drive configuration captured from the surviving roll. The roll shop receives a specification that matches what was originally installed — not a generic replacement that requires shimming and adjustment at installation. Common on older machines where the original roll supplier is no longer in business or the drawings were never transferred to the current owner.
From $1,400
Est. — contact for quote
Dryer Can & Pressure Roll Condition Scan
Dryer can shell surface condition, face geometry, and journal runout documented for paper machine dryer section assessment. Shell distortion, wear patterns, and cross-machine profile variation captured at full face length. Used to support rebalancing decisions, shell replacement planning, and dryer section alignment verification after a rebuild. Pressure roll surface condition and crown profile captured using the same workflow.
From $1,100
Est. per unit
Winder & Unwind Station Geometry Scan
Winder and unwind roll positions, rider roll geometry, and web path alignment captured for tension uniformity analysis and roll-building quality troubleshooting. Rider roll parallelism to the winding drum, the web path geometry between unwind and first nip, and the alignment of driven roll positions relative to the machine centerline all affect roll-building quality and web tension uniformity in ways that are difficult to diagnose without a complete geometric picture of the station.
From $1,400
Est. — contact for quote
On-Site Deployment
We come to your mill or converting facility. Equipment operates from battery — no machine shutdown required for access. We work during scheduled maintenance windows, slow rolls, or production pauses. The Southeast has significant paper, tissue, film, and converting operations within practical travel range. All pricing is estimated — contact us with your machine type, roll count, and problem description.
| Within 50 miles of Nashville 37206 | Included |
| 51–150 miles | +$180 |
| 151–300 miles | +$295 |
| 300+ miles | Quoted individually |
| National travel | Contact for quote |
When Mill & Converting Teams Call Us
Scenario — Cross-machine caliper variation
A calender stack is producing a consistent caliper streak 18 inches from the tending side. Roll surface measurements don't show anything obvious.
Discrete diameter measurements at sampled stations across the roll face missed a localized wear flat between measurement points. We scan the full roll face and the deviation map shows exactly where the surface has worn — a localized flat 3 inches wide that was falling between the conventional measurement stations. The calender roll goes out for a targeted grind and the streak disappears. The full surface map found what sampled measurements couldn't.
Scenario — Coating weight distribution
A blade coater is showing cross-machine coat weight variation that shifts position when the backing roll is changed. The new backing roll matches the specified crown.
The backing roll crown specification is correct but the nip geometry isn't. The new roll was ground to the right crown but has a slight taper end-to-end that wasn't caught in conventional measurement. We scan both the backing roll and the blade opposite roll in their operating positions and the nip geometry map shows the taper-induced nip non-uniformity clearly. The backing roll goes back for a corrective grind and the coat weight distribution corrects.
Scenario — Roll replacement, no drawings
A size press roll failed and the original supplier is out of business. The machine is 1988 vintage and no drawings exist.
A failed size press roll on a 1988 machine — the original roll supplier closed in 2003 and no drawings were ever transferred to the current mill owner. The replacement roll shop needs journal dimensions, face length, crown profile, and drive end geometry to fabricate a replacement. We scan the failed roll before disposal, extract the original nominal geometry, and give the roll shop a complete specification. The replacement goes in without the shimming cycle that a generic replacement would require.
Scenario — Frame distortion after rebuild
A press section was rebuilt after a felt change failure damaged the frame. Cross-machine moisture profile has been unstable since the rebuild.
The frame repair brought the press rolls back to within conventional measurement tolerances — but the cross-machine moisture profile has shifted and drifts through the shift. We scan the bearing housing positions on both sides of the press section and find that one housing is shimmed 0.8mm higher on the tending side than it was before the rebuild — within the tolerance that was accepted, but enough to produce the nip non-uniformity that's affecting the moisture profile.
Scenario — Winder roll quality
A winder is producing rolls with sporadic telescoping on the tending side. Rider roll pressure settings have been adjusted without improvement.
Rider roll pressure adjustment addresses the symptom but the problem is in the geometry. We scan the rider roll and winding drum positions and find the rider roll is 1.2mm out of parallel with the drum across the web width — enough to create a differential nip load that drives web tension toward the tending side. The rider roll mounting is corrected and the telescoping stops. Roll geometry was the problem. Pressure settings were the wrong variable to adjust.
Scenario — Dryer section rebuild
A dryer section is being rebuilt. The engineering team wants baseline documentation of dryer can geometry before the rebuild begins.
Pre-rebuild baseline scan of the dryer section — each can's shell geometry, journal runout, and face profile captured before teardown. Post-rebuild, a second scan verifies that the rebuilt section matches the pre-rebuild baseline or the corrected target, and documents the as-built configuration for maintenance records. The mill has an objective record of the dryer section geometry going into the next production cycle, and the basis for diagnosing any moisture or speed issues that develop after the rebuild.
Questions from Mill & Converting Maintenance Teams
Can you scan rolls without removing them from the machine?
In most cases yes. The HandyScan Black Elite is handheld and captures roll surface geometry with the roll in its operating position. For full circumferential surface capture the roll needs to rotate, which typically requires a slow roll or maintenance jog mode. For face profile and crown documentation, a single-position scan of the accessible face is often sufficient. We discuss access requirements during scope review.
How does this compare to conventional roll measurement?
Conventional roll measurement with micrometers or dial indicators samples discrete points — typically 5 to 10 positions across the roll face. A localized wear flat, a high spot, or a surface defect that falls between measurement stations gets missed. Scanning captures millions of points across the full face in a single session. Crown variation, localized wear flats, out-of-round conditions, and taper from end to end are all visible simultaneously in a color-mapped deviation report. The full picture, not a sampled estimate.
What industries and web processes does this apply to?
Paper and paperboard, tissue and towel, film and foil converting, flexible packaging, nonwoven fabric, coating and laminating, label converting, and any web-based process where roll geometry affects product quality. The Southeast — Tennessee, Georgia, Alabama, the Carolinas — has significant operations in all of these industries within practical travel range from Nashville.
Can you reverse engineer a roll when the original drawings don't exist?
Yes. We scan the existing roll — operational or removed — and extract journal dimensions, face length, crown profile, end geometry, and drive configuration. The roll shop receives a complete specification for the replacement. This is particularly common on older Southeast paper machines where the original equipment manufacturer is no longer in business and drawing archives were never transferred to the current owner.
Can you work during a maintenance window without extended machine downtime?
Yes. We plan around your maintenance schedule. A single roll surface scan typically takes 30 to 60 minutes on-site depending on roll size and access. A full nip station including both rolls and frame geometry takes two to three hours. Equipment is battery-powered — no machine power required. We work during felt changes, planned maintenance windows, and scheduled slow-roll periods.
Ready to discuss your roll geometry problem?
Tell us the machine type, the product quality issue you're troubleshooting, and your maintenance window. We'll respond within one business day.