Tear opening for display packages and method of making same

Claim 1

IN A PACKAGE CONSISTING OF STRETCHABLE AND SHRINKABLE PLASTIC SHEET MEMBERS SEALED TO EACH OTHER AND TO AN OUTER PAPERBOARD SHEET, THAT IMPROVEMENT IN PERFORATED, LAMINATED TEAR OPENING STRUCTURE CONSISTING OF A LINE OF PERFORATIONS IN SAID PAPERBOARD SHEET CONSTITUTING THE OUTER WALL OF SAID PACKAGE, SAID LINE OF PERFORATIONS EXTENDING FROM AN OUTSIDE EDGE OF SAID WALL ALONG A LINE INTO THE INTERIOR PORTION OF THE PACKAGE WHICH EXTENDS BEYOND THE EDGE OF THE INNER PLY OF PLASTIC SHEET MATERIAL THEREUNDER, ELONGATED BANDS ON EACH SIDE OF SAID LINE OF PERFORATIONS SEALED UNDER HEAT AND PRESSURE TO BOND THE INNER PLASTIC SHEETS ALONG SAID BANDS TO EACH OTHER AND TO THE OUTER PAPERBOARD WALLS WHILE LEAVING AN ELONGATED ZONE OF INNER PLASTIC PLIES BETWEEN SAID BANDS WHICH LIES DIRECTLY OPPOSITE SAID LINE OF PERFORATIONS IN UNSEALED CONDITION, THIS UNSEALED ELONGATED ZONE SETTING THE DIRECTION OF TEARING INTO THE INNER PLIES OF PLASTIC WHEN SAID PERFORATED LINE IS TORN INWARDLY STARTING AT THE OUTER EDGE OF THE PACKAGE.