What Tension Control System Is Recommended for Slitting Self-Adhesive Labels to Avoid Label Shifting?

Self-adhesive label converting is among the most demanding processes in the flexible packaging and label industry. A self-adhesive label stock is a three-layer composite — face material, adhesive, and silicone-coated release liner — which makes it inherently sensitive to tension variations. When tension is not precisely controlled during slitting, labels shift laterally or longitudinally on the liner, leading to die-cutting misalignment, telescoped rolls, and costly rejects. For production engineers and plant managers, the question of which tension control system to use is therefore a critical investment decision.

Why Label Shifting Happens

Label shifting occurs when the forces acting on the web during slitting are unbalanced or variable. The most common root causes include:

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• Inconsistent unwind tension from the jumbo roll, especially as roll diameter decreases during operation.
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• Lateral web wandering due to the absence of effective automatic deviation correction.
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• Uneven rewind tension across the web width, which deforms the label matrix.
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• Disturbances caused by the waste matrix being peeled away unevenly during the die-cutting and slitting process.
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• Speed variations that induce sudden tension spikes, particularly at machine start-up and reel changeover.
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None of these issues can be fully resolved by manual tension adjustment alone. A coordinated, automated tension control system is required.

The Recommended Tension Control System for Self-Adhesive Label Slitting