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Apparatus and method for producing waterproof structural corrugated paperboard

Image Number 4 for United States Patent #7998300.

Two paper webs, saturated with a B-phase phenolic resin and dried, are conveyed through separate low melting point metal alloy baths, one web after being corrugated, to convert the resin to a fully cured phase, whereafter the webs are joined to form a structurally rigid waterproof single face corrugated web.

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