In-line process for the production of corrugated board
AssigneeInternational Paper Company
InventorsJames A. Lock, Leroy C. Hofmann, Chester P. Kulesza
Life of this patent
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Abstract
An efficient, inexpensive, in-line process is provided for producing additive-impregnated corrugated board, such as those having excellent rigid-when-wet and rigid-when-humid strengths. The process comprises applying an additive, such as water- and moisture-resistant resin, flame retardant, fire proofing agent, fungicide, mold-inhibitor, insecticide, or the like, in the form of a collapsible foam of a dispersion or solution of the additive to the corrugated medium, and desirably the liners, at the time the corrugated board is being formed.
Claims18
An in-line method of making corrugated paperboard with excellent rigid-when-wet strength and having a corrugated medium and at least one liner attached thereto, which method comprises applying to at least one liner or said corrugated medium a rapidly collapsible foam of a dispersion of a water resistant impregnating resin, bringing said corrugated medium and said liner into adhesive contact with each other, heating the resulting composite to complete collapsing of said foam and to thereby complete the impregnation of said medium with said resin, and finally drying said composite after the completion of the collapse of said foam by further heating.
Dependencies are inferred from the claim text.