Patent ID: 9017803
Filing Date: 2015-04-28
Classification: B29C,B32B,D21H,E04F,Y10T

Abstract:
1. A multi-ply paper substrate, comprising: at least three adjoining plies, at least two of the adjoining plies being bonded to one another by an adhesive therebetween, the adhesive being selected from the group consisting of starch, cooked starch, and adhesive starch; a basis weight of 80-200 gsm; an internal bond of 10-180 milli-ft.-lb/sq. in. as measured by TAPPI method 541; an MD tensile of 20-300 lb/inch width as measured by TAPPI method 494; and a CD tensile of 10-300 lb/inch width as measured by TAPPI method 494; wherein at least one of said plies has an internal bond higher than that of the other of said plies, the adhesive, or both the adhesive and the other of said plies.