Stock material or miscellaneous articles – Structurally defined web or sheet – Nonplanar uniform thickness material
Patent
1991-11-22
1994-05-24
Loney, Donald J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Nonplanar uniform thickness material
428179, 428212, 428184, 428186, B32B 328
Patent
active
053147383
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a composite corrugated body wherein vertically extending ridges and grooves are formed alternately in a sheet material to form corrugate lines that meander in a plane to form a corrugated body and wherein a flat liner is adhered to at least one of the opposite faces of the corrugated body.
PRIOR ART
Various sandwiched materials such as corrugated board and honeycomb board are well known, and one corrugate board that actually has been put into products includes a corrugated body having straight corrugate lines and having a flat sheet adhered to at least one of the opposite faces thereof. In recent years, however, various modifications and improvements have been made to such corrugated body, and there are available many publications of investigations of corrugated bodies which have meandering corrugate lines as hereinafter described.
The inventor has made several investigations and experiments, and it has been found that, in order to put such corrugated body into practical use, it must have at least the following structural features: sheets are applied to the opposite faces of a corrugated body having straight corrugate lines, as is represented by the structure of an ordinary corrugated board, a composite corrugated body which includes two flat sheets of a similar material and having an equal thickness, the amount of material of the corrugated body is equal to or increased by 10%, and the structural strength improved by more than 15%. meters per minute by a roll forming operation which assures a quality normally maintaining a stable shape and material strength. structural strength/cost of product, is higher by at least 10%, and preferably by 30% or more, than that of the existing composite corrugated body.
Structural strength that a composite corrugated body should have will be described subsequently. In a composite corrugated body 4 as shown in FIGS. 17(A)-17(D), wherein a corrugated body 2 having meandering corrugate lines 1 and flat sheets 3 are integrated with each other:
Profile Requirement A-1
It is essential that the flat crushing or shearing rigidity in the x direction in the z-x plane is sufficiently high, and to this end, it is required that a substantial amplitude ratio H/L of the profile of the corrugate lines 1 should be higher than 0.4 (refer to FIG. 17(A)).
The substantial amplitude ratio H/L is a ratio between an amplitude H and a wavelength L of a sectional wave defined when the corrugate lines 1 are cut along the x-z plane, i.e. a vertical plane in the x direction in FIG. 17(A).
Profile Requirement A-2
It is essential that the bending rigidity of the composite corrugated body, when supported at opposite sides along the y direction and subjected to vertical force F, be sufficiently high, and to this end, it is required that a substantial meandering overlapping ratio D/L of the profile of a corrugate line 1 should be higher than 0.5 (refer to FIG. 17(B)). Here, the substantial meandering overlapping ratio D/L is a ratio between an amplitude D of meander of a corrugate line when the corrugate line 1 is viewed in the x-y plane, and wavelength L.
Profile Requirement A-3
It is essential that the compression rigidity in the x-y plane is sufficiently high, and to this end, it is desired that a width w of joining between the corrugated body 2 and the flat sheets 3 when they are adhered to each other should be as great as possible (refer to FIG. 17(C)).
Among the three requirements described above, the requirements A-1 and A-2 should be provided at the same time, and if one of the requirements is not satisfied, the required mechanical strength will not be achieved.
The workability that a composite corrugated body should have now will be described. When a work sheet is roll formed at a high speed by a corrugator, it is first necessary for a stretch strain ratio to be restricted to lower than 5% adjacent crest and bottom portions of the corrugate lines 1. Further, it is essential that no tearing damage should take place at or around neu
REFERENCES:
patent: 2963128 (1960-12-01), Rapp
patent: 3698879 (1972-10-01), Lucien
patent: 3992162 (1976-11-01), Gewiss
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