During the past five years, the corrugated industry has moved toward higher usage levels of recycled liner and high-performance (high ring crush) liners to meet customer requirements. These changes will require plants to alter their normal operating practices on the corrugator as well as in the press department to avoid score cracking problems.
All liner can crack or check under hot or dry atmospheric conditions. Cracking is especially evident during the drier winter months, or in heated storage environments. Today, many corrugated operations are modifying their machines to run hotter and faster, thus further increasing incidents of cracking.
Recycling and high-performance liners appear to suffer from higher levels of moisture loss during the converting process than does typical liner produced with similar moisture content.
