The invention relates to a method and a device for packaging a product in a packaging material. Second resonators C\u20142 or first and third resonators C\u20141 and Cx\u20141 connected in parallel form series-arm resonators or parallel-arm resonators C\u20141 connected in a lattice pattern. A plurality of lever arms are pivotally mounted on the bracket, with each arm having opposite front and back sides. The plastic of the second outer layer is a thermoplastic polymer or a mixture thereof.