Corrugated paperboard strength enhancing process

Details Corrugated paperboard strength enhancing process Corrugated paperboard strength enhancing process

1992-04-27

1994-03-08

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156210, 1563075, 118324, 427264, B32B 3108, B31F 120

Patent

active

052923916

ABSTRACT:
A corrugated paperboard strength enhancing process includes at least one resin application station located within the confines of the corrugator at a position where it is operable to apply a preselected amount of strength enhancing resin to at least one side of the medium after it has been fluted and most preferably before adhesive has been applied to the medium for securing liner paper thereto. At least one liner is adhered to the set of opposed flute tips. Thereafter the combined board with the resin compound on selected transverse portions of the fluted medium is allowed to cure, under selected temperature and moisture conditions and without the application of pressure that would crush the fluted medium. A suitable resin for the intended purpose is an isocyanate compound. The strength-enhanced corrugated paperboard can be efficiently repulped.

REFERENCES:
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patent: 3341354 (1967-09-01), Woods et al.
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patent: 3586564 (1971-06-01), Brackett
patent: 3616163 (1971-10-01), Reisman
patent: 3953169 (1976-04-01), Igarashi et al.
PCT/US92/03641: PCT International Search Report mailed Oct. 21, 1992.
K. Asei et al., "The Use of Modified Polymeric MDI in Reinforced Corrugated Fibreboard Container System," 30th Annual Polyurethane Technical/Marketing Conference, Oct. 15-17, 1986, pp. 176-181.

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