Flexible corrugated sheet material and method of fabricating same

Claim 1

FLEXIBLE CORRUGATED SINGLE FACED SHEET MATERIAL HAVING A FLEXIBLE BACKING PLY AND A CORRUGATED PLY ADHESIVELY SECURED THERETO, THE RAISED UNSECURED PORTIONS OF THE FLUTES OF THE CORRUGATED PLY BEING CUT IN AT LEAST SOME AREAS OF THE SHEET ALONG A SERIES OF SUBSTANTIALLY PARALLEL LINES INTERSECTING THE CORRUGATIONS AT RIGHT ANGLES WITH NEGLIGIBLE DIMINUTION IN VOLUME OF THE CUT PORTIONS OF SAID FLUTES, THE TOP AND SIDE WALLS OF THE SAID CUT PORTIONS OF THE FLUTES TERMINATING AT INWARDLY FOLDED EDGES AND DEFINING VOIDS IN THE SAID FLUTES AND FORMING IN EACH FLUTE A PLURALITY OF TRUNCATED SECTIONS WITH STRENGTHENED END EDGES, EACH SAID TRUNCATED SECTIONS BEING SECURED TO SAID BACKING PLY ALONG TWO PARALLEL SIDES ONLY, WITH THE SECURED SIDES BEING CONTINUOUS WITH THE SECURED SIDES OF THE NEXT ADJACENT TRUNCATED SECTION.