Patent ID: 8572936

Claim:
A sealing jaw, for producing sealed packages of a food product from a tube of packaging material fed along a path, comprising a first work surface which interacts with a second work surface on a counter-jaw to grip said packaging material and form a sealing strip crosswise to said path; one of said jaw and counter-jaw defining an anvil, and the other of said jaw and counter-jaw defining heating means which interact with said anvil to form said strip; wherein said first surface comprises: at least two projections elongated along respective first axes, and which, when forming said strip, compress respective areas of said packaging material against said second surface; and at least one cavity which extends along one of said first axes, is interposed between two consecutive said projections along a second axis crosswise to said first axis, and is located laterally with respect to a central plane of said first work surface; at least a first of said projections being defined by two curved first walls; at least one of said first walls, when sectioned in a second plane perpendicular to the respective said first axis creates an imaginary cylindrical surface, comprising a first arc of a first radius and a first angle; said cavity having a curved profile; said profile, when sectioned in a plane perpendicular to said first axis creates another imaginary cylindrical surface, being in the form of at least a second arc of a second radius and a second angle; said first radius is in a range between 0.1 and 0.3 mm; said second arc defining a bottom part of said cavity and said second radius being in a range between 0.1 and 0.4 mm; and a distance between said projections measured along said second axis being in a range between 0.5 and 2.5 mm.