Tooling for use in heat-sealing of flexible materials used in packaging

An improvement in heat-seal jaws, the improvement comprising:

• in a first jaw of said set of heat-seal jaws at least three valleys each of which having a depth and shape of valley groove, and
• in a second jaw of said set of heat-seal jaws at least three peaks each of which having a height such that a peak that is a minor crown has a lesser height than a peak that is a major crown;
• wherein each of said peaks is juxtaposed to one of said at least three valleys;
• whereby each major crown is juxtaposed to a valley having a higher valley depth, each minor crown is juxtaposed to a valley having lower valley depth and a rounded shape, and each minor crown is flanked by a major crown.

A method of heat-sealing of flexible packaging materials comprising the steps of:

• positioning said flexible material between a first heat-seal jaw and a second heat-seal jaw,
• heating each of said first heat-seal jaw and said second heat-seal jaw,
• closing said first heat-seal jaw and said second heat-seal jaw on said flexible material;
• and
• opening said first heat-seal jaw and said second heat seal jaw,
• whereby said flexible material is sealed by heat transfer applied by two-sided heating of said material and by the application of force by the closing of said jaws, which first jaw having at least three valleys each of which having a depth and shape of valley groove, and which second jaw having at least three peaks each of which having a height such that a peak that is a minor crown has a lesser height than a peak that is a major crown;
• wherein each of said peaks is juxtaposed to one of said at least three valleys, each major crown is juxtaposed to a valley having a higher valley depth, each minor crown is juxtaposed to a valley having lower valley depth and a rounded shape, and each minor crown is flanked by a major crown.