Seal for packages capable of thermoplastic sealing and means for effecting such sealing

Claim 1

In apparatus for sealing packaging materials having thermoplastic surfaces, a pair of elongated heated jaws which are hingedly connected and at least one of said jaws being mounted on compression springs to float into engagement with one another, one jaw having a longitudinally extending land thereon, the face width of which is greater than its depth, and the other jaw having a longitudinally extending groove therein for receiving said land, said groove having dimensions substantially like the dimensions of the land, said jaws including can means at their opposite ends for forcing said jaws together in substantially parallel relation to stretch, heat, and press together the packaging materials to effect the sealing thereof, such opposite end location of said means on said jaws allowing an unobstructed path of movement of the packaging materials between the jaws in a direction transversely thereof when the jaws are open.