CORRUGATED AND PERFORATED THIN-SHEET MATERIAL Russian patent published in 2017 - IPC A61F13/511 

FIELD: textile, paper.

SUBSTANCE: proposed thin-sheet materials contain alternating ridges and grooves, and the perforation holes are located in the grooves. In one embodiment, the thin-sheet material comprises alternating ridges and grooves, as well as alternating regions with a lower surface density and a higher surface density. Regions with a higher surface density are located in the ridges and grooves, and regions with a lower surface density are located on the side walls between the ridges and grooves. Regions with a higher surface density, located in the grooves, contain perforation holes.

EFFECT: perforation holes have a larger open area than the holes in similar thin-sheet materials that can be manufactured in the state of the art.

15 cl, 35 dwg, 2 ex, 1 tbl