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In all web processes, continuous roll quality is an important part of web stability, production quality and end product quality.

Shafts and cores are similar to a building's foundation. If the foundation is poorly constructed, not level or out of square, the entire building suffers. As the building goes up the impact of the defects increase. The same is true with rolls. If the core or shaft is of poor quality the roll may be defective.

As printing and converting become more digital, the role of air shafts becomes more important. The precision tuning of processes made possible by digital controls allows printers and converters to run at higher speeds and deliver higher quality finished products. Higher speeds place greater stress on the roll and on the shaft's ability to hold securely to the core.

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