Web Tension Control Problems in Roll-to-Roll Machines

Web tension problems can appear as wrinkles, web breaks, registration error, loose rolls, telescoping rolls or unstable winding. The cause may be control method, roller layout, brake selection, sensor placement or material sensitivity.

Wrinkles

Wrinkles may come from uneven tension, poor roller alignment, unstable web path or excessive tension for the material. Tension control should be reviewed together with web width, roller wrap angle and whether the material is film, paper, foil or nonwoven.

Web break

Web breaks often occur when tension spikes during acceleration, deceleration, splice handling or roll diameter change. Closed-loop control can help when direct feedback is needed, but brake sizing and control response must also match the line speed.

Unstable winding

Finished roll problems may relate to rewind tension, taper tension, nip pressure or material properties. The controller and brake or motor control should match the winding section, roll diameter range and target roll hardness.

Registration error

In printing or laminating, unstable tension can shift the web lengthwise and affect registration. Review tension zones around unwind, infeed, printing, outfeed and rewind rather than only checking one controller.

RFQ information to prepare

• Machine type and control section
• Web width, material and thickness or GSM
• Line speed, roll diameter and roll weight
• Target tension range and current defect symptoms
• Brake, clutch or motor information
• Photos, drawings and roller layout if available

FAQ

Does every line need closed-loop tension control?

No. Some simple sections can use open-loop control, but sensitive materials and demanding winding often benefit from closed-loop feedback.

Can tension control fix roller alignment problems?

No. Mechanical alignment problems should be corrected separately.

What product should I start with?

Start from the web tension control system page, then review controller, sensor and amplifier options for the specific section.

Related product pages

• Web tension control system product overview
• TC100 automatic tension controller