Forming of pressed trays

Details Forming of pressed trays Forming of pressed trays

1990-09-04

1993-07-27

Loney, Donald J.

Stock material or miscellaneous articles

Perimeter or corner structure of sheet

Paper sheet

428 342, 428 66, 428 81, 428153, 428155, 428156, 428157, 428167, 428192, 4285375, 229 25R, 493968, 220405, 220574, 220609, 220604, 220610, 220623, 220624, B32B 302, B65D 9004

Patent

active

052309398

ABSTRACT:
A product press formed from a paperboard and a method for forming the same is provided, wherein the product includes a press formed three-dimensional curvilinear region having a desired shape and containing a formation improvement structure for facilitating the press formation and maintenance of the desired product shape and for preventing the machine directionality of the paperboard from distorting the product from its desired shape. The press formed paperboard product of the preferred embodiment comprises a planar wall having a periphery which is at least partially curvilinear and a peripheral wall angularly oriented with respect to the planar wall. The peripheral wall extends along at least a portion of the curvilinear periphery of the planar wall and the closest portion of the peripheral wall is spaced a substantial radial distance from the periphery of the planar wall. The press formed three-dimensional curvilinear region extends radially outwardly from the curvilinear periphery of the planar wall while simultaneously curving out of the plane defined by the planar wall. The formation improvement structure includes a peripherally extending crush score line having a substantial directional component extending generally parallel to the curvilinear portion of the periphery of the planar wall. The crush score lines may be circular, sinusoidal or saw tooth shaped.

REFERENCES:
patent: 3401863 (1968-09-01), Earl
patent: 3720365 (1973-03-01), Unger
patent: 3792809 (1974-02-01), Schneider et al.
patent: 4606496 (1986-08-01), Marx et al.
patent: 4609140 (1986-09-01), Handel et al.
patent: 4721499 (1988-01-01), Marx et al.
patent: 4721500 (1988-01-01), Handel et al.

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