Patent ID: 8444539
Filing Date: 2013-05-21
Classification: B31B,B31F,D21H,Y10T

Abstract:
1. A reverse folding score on a sheet material formed by a rotary press, wherein: the reverse folding score comprises: the reverse folding score is formed by the rotary press crushing the sheet material between a die roll and an anvil roll of the rotary press, the die roll comprising a pair of scoring members integrally formed with a base portion joined to a die board of a die roll of the rotary press, the scoring members comprising scoring surface portions with a flat outer surface extending at an angle, the anvil roll comprising an anvil formed of a compressible rubber-type material, and wherein as the scoring members rotationally press against the first side of the sheet material to form the laterally spaced score line, the second, opposite side of the sheet material is compressed against the anvil such that the sheet material is crushed between the die roll and the anvil roll, and the rubber-type material of the anvil bulges towards the sheet material and forces the sheet material into an area between the pair of score members causing the inwardly extending groove to be formed on the second, opposite side of the sheet material; and wherein the sheet material folds in a reverse fold along the reverse folding score in a direction away from the pair of score lines on the first side of the sheet material and towards the second side of the sheet material, and the reverse folding score sufficiently facilitates the reverse folding of the sheet material.