Patent ID: 8110053

Claim:
A method for cutting along a cutting line of a laminate, including a first and a second surface layer surrounding an intermediate layer of a porous elastic material, wherein the laminate is pressed together between an ultrasound emitting element and a counteracting element during ultrasound cutting of the laminate simultaneous with ultrasound welding of the first and the second surface layers to each other, wherein the laminate is pressed together in a local nip between the ultrasound emitting element and the counteracting element, and wherein the laminate is moved in the cutting line through and past the local nip simultaneous with ultrasound welding of the first and the second surface layers to each other, said method comprising the step of allowing the laminate to recover during exerting of a certain tension laterally, as seen over the cut area, whereby the still soft and now melted together region of the surface layers is subjected to a small tensile force in the area of a joint between the surface layers, and whereby an alignment and smoothening of the joint portion occurs during simultaneous cooling of the cut area to form a smooth, rounded, continuous edge joint between the surface layers at a free edge of the laminate being formed through the cutting.