[Technical Column] Slipping Even with High Tension? Two Approaches to Solve the Slip of Expander Rolls
A severe challenge frequently occurring in converting operations is "the expander roll slips even though the tension is sufficient." The root cause lies in the confusion between the "tangential force" that rotates the web and the "starting torque" that hinders rotation. Simply calculating tension will not resolve the slip. For reliable follow-up rotation, it is essential to achieve both "reduction of starting torque to the limit" and "optimal grip force" that holds the web. In this article, we present our company's "two strongest approaches" to overcome this challenge.
1. [Ultra-low torque assembly × non-polished crepe material]: Incorporating crepe processed rubber with strong grip without grinding, achieving ultra-low torque rotation.
2. [Japan's only precision grinding in a curved state]: Grinding while maintaining the original curved shape to eliminate eccentricity. This creates optimal grip force and uniform surface pressure.
We propose specifications that perfectly match the site environment, from low tension to over 2000 kgf high tension. Companies considering fundamental solutions through replacement of existing equipment or new installations, rather than temporary measures, are encouraged to read the full article.

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Even with sufficient web tension, the cause of roll slippage lies in the confusion between "starting torque" and "tangential force." We will explain our unique solution that achieves both the reduction of internal resistance to its limits and optimal grip strength through our proprietary technology (incorporation of unpolished crepe material and precision polishing in a uniquely curved state, the only one in Japan).




