Patent ID: 8663081

Claim:
A scoring rule for forming a reverse folding score on a sheet material supplied between the scoring rule and an anvil, comprising: a pair of score members each comprising a scoring surface portion with an individually asymmetrical flat outer surface extending at an angle, the scoring members integrally formed with a base portion joined to a die board of a die roll of a rotary press, wherein the anvil comprises a compressible rubber-type material joined to an anvil roll of the rotary press; and wherein upon compressing the sheet material, the pair of score members press against a first side of the sheet material such that the pair of scoring surface portions cause a pair of reverse fold score lines to be formed on the first side of the sheet material, the score lines comprising a complementary shape to the scoring surface portions such that the score lines each comprise an individually asymmetrical surface, and as the scoring rule engages the sheet material, a second, opposite side of the sheet material is compressed against the anvil such that 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 a reverse fold channel to be formed on the second, opposite side of the sheet material.