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Surface heating for a corrugated medium web

Image Number 2 for United States Patent #5897824.

In a single facer, the premoistened medium web is dried on both surfaces to a shallow depth immediately prior to passage through the corrugating nip. The dried shallow surface layers substantially decrease friction between the flutes of the corrugating rolls and the paper while the interior of the web is maintained in a moist condition necessary for formability.

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