Network structures having different cross-sections

Details Network structures having different cross-sections Network structures having different cross-sections

1975-06-26

1979-03-13

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including grain, strips, or filamentary elements in...

428212, 428224, 428255, 428284, 428364, 428397, 428401, B32B 512

Patent

active

041443683

ABSTRACT:
Methods of making network structures include forming on one side of a sheet of thermoplastic polymer a plurality of parallel continuous main ribs and forming on the other side of the sheet in a different direction a plurality of continuous parallel tie ribs, with the ratio of cross-sectional areas of the main ribs to the tie ribs preferably being 1.5:1 or greater and the ratio of the height of the main ribs to the thickness of the webs between the main ribs being 3:1 or greater. The ribbed sheet thus formed is drawn in either one direction or in two preferably perpendicular directions to open the sheet into a network structure and to orient the main ribs and preferably also to orient the tie ribs.

REFERENCES:
patent: T909008 (1973-04-01), Fruehauf
patent: 1997389 (1935-04-01), Palmer
patent: 3132099 (1964-05-01), Elhauer
patent: 3345242 (1967-10-01), Rasmussen
patent: 3437538 (1969-04-01), Ewing
patent: 3554853 (1971-01-01), Mercer et al.
patent: 3560306 (1971-02-01), Nalle
patent: 3656360 (1972-04-01), Fix
patent: 3705070 (1972-12-01), Kim
patent: 3713942 (1973-01-01), Kim
patent: 3726079 (1973-04-01), Field et al.
patent: 3730821 (1973-05-01), Jackson
patent: 3740304 (1973-06-01), Okumuro et al.
patent: 3816231 (1974-06-01), Marshall
patent: 3819451 (1974-06-01), Nalle
patent: 3874969 (1975-04-01), Hureau

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