
Containerboard, also referred to as CCM or corrugated case material, is a type of paperboard specially manufactured for the production of corrugated board. The term encompasses both linerboard and corrugating medium (or fluting), the two types of paper that make up corrugated board. Since containerboard is made mainly out of natural unbleached woo...
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http://en.wikipedia.org/wiki/Containerboard

The component materials used in the fabrication of corrugated cardboard.
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http://www.encyclo.co.uk/local/20096

any paperboard used in making containers, as corrugated paper or cardboard.
Found on
https://www.infoplease.com/dictionary/containerboard
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