Patent ID: 7228676

Claim:
Improved die cavities in a die roll assembly for use in connection with the encapsulation of performs by plastic films traveling between a pair of die rolls, wherein the improvement in said cavities comprises: a plurality of die cavities formed in said die rolls, wherein each of said die cavities includes a recess for receiving a perform therein, wherein said recess includes a floor and a side wall connected to the floor and defined by a land raised relative the surfaces of the dies defining the boundaries of recess, said land including two rounded peripheral sections connected to two straight peripheral sections, and wherein the land has a step-cut facing inwardly relative the cavity center formed in only said rounded peripheral sections extending initially downwardly from said land toward said floor of said recess a first predetermined distance and then orthogonally laterally inwardly a second predetermined distance substantially the same as said first predetermined distance to define a sealing area adjacent the land of said recess to admit film to be sealed around a preform placed in said recess.