Structural sheet design for reduced weight and increased rigidit

Details Structural sheet design for reduced weight and increased rigidit Structural sheet design for reduced weight and increased rigidit

1997-10-24

1999-10-26

Loney, Donald

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428120, 428178, 428188, 527931, B32B 328

Patent

active

059724757

ABSTRACT:
Improved extruded synthetic polymer resin sheet structures are disclosed having optimized combinations of rigidity, light transmission, thermal insulation and sheet weight per unit surface area. These improved structures have rib structures where the shear modulus equivalent value ("G") is optimized and is in the range of from about 0.5 to less than about 8. In one embodiment, an average of from one to nine rectangular cells per every ten cells contain a diagonal rib. In a preferred embodiment there are two crossing diagonals located in alternating rectangular cells. The reduction in the number of diagonal ribs reduces the weight of the sheet (per unit surface area) but surprisingly does not cause a proportional reduction in the sheet strength and rigidity.

REFERENCES:
patent: 3935357 (1976-01-01), Padovani
patent: 5294472 (1994-03-01), Arnold et al.
patent: 5348790 (1994-09-01), Ben-Zvi et al.

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