Contact-free method of forming sift-proof seals

Details Contact-free method of forming sift-proof seals Contact-free method of forming sift-proof seals

1990-01-22

1991-06-18

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

15624411, 156295, 118315, 118411, 427286, 493 85, 493128, 493131, 493151, B32B 3106

Patent

active

050247093

ABSTRACT:
A method of forming a sift-proof seal for closure of a box having a plurality of folded flaps, the seal being formed by an adhesive strip pattern. The flaps are moved linearly toward a plurality of nozzles which extrude adhesive in a pattern of closely spaced adhesive strips. A flap having such an adhesive pattern is brought into contact with a second flap to compress the pattern of adhesive therebetween. The spacing between adjacent strips of adhesive is such that the folding of the flap causes merging of the adhesive to form a continuous strip of adhesive, thereby forming a box closure. The adhesive pattern is limited to a first outside edge of the first flap, with each remaining outside edges receiving a sift-proof continuous line of adhesive.

REFERENCES:
patent: 1258294 (1918-03-01), Carlson
patent: 4115178 (1978-09-01), Cone
patent: 4157149 (1979-06-01), Moen
patent: 4550681 (1985-11-01), Zimmer et al.
patent: 4679711 (1987-07-01), Trevathan
patent: 4687137 (1987-08-01), Boger et al.
patent: 4735169 (1988-04-01), Cawston et al.
patent: 4774109 (1988-09-01), Hadzimihalis et al.
patent: 4836440 (1989-06-01), French

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