Reinforced paperboard cartons and method for making same

Details Reinforced paperboard cartons and method for making same Reinforced paperboard cartons and method for making same

1984-11-13

1986-10-14

Kittle, John E.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428131, 206161, 8192, 229 16R, 224906, 427411, 427285, 427288, 493148, 493328, B32B 2900, D06M 1334, B65D 562

Patent

active

046172238

ABSTRACT:
A selectively reinforced paperboard carton having areas of reinforcement formed by impregnating the uncoated paperboard carton blank in patterned areas with a polyisocyanate which reacts with hydroxyl groups within the paperboard to form a cured polyurethane reinforcement. The preferred polyisocyanate is polymethylene polyphenylisocyanate.

REFERENCES:
patent: 2897094 (1959-07-01), Hayes et al.
patent: 3413144 (1968-11-01), LaCombe et al.
patent: 3778302 (1973-12-01), Dahl
patent: 3953169 (1976-04-01), Igarashi et al.
patent: 3967016 (1976-06-01), Schneller et al.
patent: 4354890 (1982-10-01), Maffey

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