Created on 04.21

How to Prevent Wrinkling During High-Speed Slitting

Wrinkling is one of the most common issues in high-speed slitting operations, especially when processing plastic films, laminates, labels, and flexible packaging materials. Wrinkles not only affect product appearance but also lead to misalignment, uneven edges, and even full roll rejection.

Preventing wrinkles is essential for maintaining stable production and consistent slitting quality.

Common Causes of Wrinkling

Unstable Tension Control

Improper tension settings can cause material slack or overstretching. Fluctuations between unwind, infeed, and rewind zones often lead to localized wrinkles.

Misaligned Rollers

If guide rollers are not parallel, uneven lateral forces develop across the web. This creates wave-shaped wrinkles during high-speed operation.

Uneven Slip Shaft Torque

When torque distribution is not uniform:

Some lanes become too tight

Others become loose

Narrow strips wrinkle easily

Slip shafts play a critical role in multi-lane slitting.

Excessive Slitting Speed

High speed increases dynamic instability. The web may not stabilize quickly enough, resulting in tension fluctuations and wrinkling.

Material Quality Issues

Non-uniform thickness, uneven winding, or internal stress in the material can cause wrinkles that become more visible at high speeds.

Practical Solutions to Prevent Wrinkling

Optimize Tension Profile

A recommended setup:

Lower unwind tension
Stable mid-zone tension
Gradually decreasing rewind tension

This helps maintain smooth web transport.

Use Differential Slip Shafts

Differential slip shafts allow each slit roll to maintain independent tension. This prevents tight and loose lanes and reduces wrinkling during high-speed slitting.

Check Roller Alignment

Ensure:

Rollers are parallel
Bearings are in good condition
Roller surfaces are clean

Even small misalignment can cause wrinkles at high speed.

Increase Speed Gradually

Avoid sudden acceleration. Gradual ramp-up allows the web to stabilize before reaching full speed.

Install Spreader Rollers

Spreader rollers help remove cross-web wrinkles and improve web flatness before slitting.