System for sizing paper and cardboard
AssigneeHercules Incorporated
InventorsAnthony C. Tansley, John D. Ballantine
Life of this patent
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Abstract
A process for increasing the resistance of the cut edges of liquid packaging board to penetration by hot hydrogen peroxide, comprising adding to an aqueous pulp slurry at a neutral to alkaline pH, either separately or in preblended form an aqueous emulsion of a cellulose-reactive size, a non-cellulose-reactive size selected from the group consisting of waxes, bis-stearamides, and fatty acid derivatives, and a thermosetting resin that is capable of covalent bonding to cellulose fibre and self-cross-linking.
Claims5
A process for making a container for consumable liquids that comprises the steps of forming an aqueous pulp slurry at neutral to alkaline pH, adding to the pulp a thermosetting resin, a cellulose-reactive size, and a non-cellulose-reactive size selected from the group consisting of bis-stearamides and glycerol triesters of natural fatty acids, wherein the cellulose reactive size is present in an amount of from about 0.01 to about 0.48 percent, the non-cellulose reactive size is present in the amount of from about 0.01 to about 2.0 percent and the thermosetting resin is present in an amount of from about 0.03 to about 0.60 percent, all based on the dry weight of the pulp, forming paperboard from an aqueous pulp slurry at neutral to alkaline pH, cutting the board to packaging size and thereby exposing cut edges of the board, coating the board with a water-proofing substance, treating it with a hot aqueous solution of hydrogen peroxide, and forming a packaging unit from the board.
Dependencies are inferred from the claim text.