Abstract: A system for generating acoustic ultrasonic vibration, with a generator for generating an alternating voltage (U) with a frequency f and converter for converting the alternating voltage into acoustic ultrasonic vibration, with a control device, which captures the vibration amplitude (Aist) of the ultrasonic vibration and compares said vibration amplitude with a desired vibration amplitude (Asoil) and changes a manipulated variable with the goal of bringing the captured vibration amplitude (Aist) closer to the desired vibration amplitude (Asoil). The generator has a frequency control module with a frequency control input. The frequency control module defines, in accordance with a signal present at the frequency control input, the frequency (f) of the alternating voltage (U) to be generated. A system which at least mitigates the mentioned disadvantages, allows higher processing speeds and associated abrupt load changes.

Abstract: The present invention relates to a processing element for processing a material, such as, e.g. a sonotrode or an anvil, having a substantially cylindrical or cylinder-segment-shaped carrier surface which is intended to come into contact with the material during processing, the processing element being provided to be rotated about its longitudinal axis during processing, so that the carrier surface moves in a circumferential direction and rolls on the material to be processed, wherein at least one structural element is arranged on the carrier surface, which structural element protrudes in a radial direction beyond the carrier surface, wherein the structural element has a top surface which is intended to come into contact with the material to be processed.

Abstract: The present invention relates to an apparatus for producing a gathered material, wherein the material consists of two material web portions and a thread positioned between the material web portions and the two material web portions are connected to one another at two connecting surfaces, wherein the thread is disposed between the two connecting surfaces such that the thread is connected to the material web portions, wherein the apparatus comprises a sonotrode having a first sealing surface and a counter tool having a second sealing surface, wherein the counter tool is cylindrical with a lateral surface and a cylinder axis and the second sealing surface is disposed on the lateral surface, wherein the sonotrode and the counter tool are disposed with respect to one another in a processing position such that the material web portions and the thread can be guided through a gap formed by the first and the second sealing surface in a feed direction tangential to the lateral surface of the counter tool.

Abstract: An apparatus for producing a gatherable material, wherein the material consists of at least two material web sections and one thread positioned between the material web sections, wherein the apparatus has a tool with a sealing surface and a counter-tool with a counter-sealing surface, wherein the tool and the counter-tool are arranged relative to one another such that the material web sections and the thread are guided through a gap formed by the tool and counter-tool, wherein the tool and/or the counter-tool has a groove for receiving the thread, wherein the groove is orientated in a feed direction divides the sealing or counter-sealing surface into partial sealing surfaces, and has a groove base and two side walls, wherein the side walls connect the groove base to the partial sealing surfaces, and at least one of the partial sealing surfaces has a flank which slopes down towards the groove base.

Abstract: A counter-element for processing a material by means of ultrasound, the counter-element having a sealing surface, the sealing surface having a welding portion which is at least partially concavely curved. The sealing surface has a feed-in portion which is arranged adjoining the weld portion and is either not curved or is concavely curved with a radius of curvature that is larger than the radius of curvature of the welding portion.

Abstract: The cutting of fibrous material which does not melt easily is effected to avoid the unravelling of cut edges, using ultrasonic or laser beam techniques. The method includes (a) applying a thermoplastic powder material to the cutting region, and (b) applying thermal shock to the localised area, sufficient to destroy the fibres of the material, and melt the powder on either side of the cut, and (c) pressing the cut edges while the fused thermoplastic powder is still soft. Woven or non-woven fabrics have tendency to unravel, after cutting, and normally require a sewn hem. The method of the invention disposes of the sewn hem, and provides a thermo-cutting technique applicable to non-fusible or non-thermoplastic fibres.

Abstract: The present invention relates to an apparatus for producing a gathered material, wherein the material consists of two material web portions and a thread positioned between the material web portions and the two material web portions are connected to one another at two connecting surfaces, wherein the thread is disposed between the two connecting surfaces such that the thread is connected to the material web portions, wherein the apparatus comprises a sonotrode having a first sealing surface and a counter tool having a second sealing surface, wherein the counter tool is cylindrical with a lateral surface and a cylinder axis and the second sealing surface is disposed on the lateral surface, wherein the sonotrode and the counter tool are disposed with respect to one another in a processing position such that the material web portions and the thread can be guided through a gap formed by the first and the second sealing surface in a feed direction tangential to the lateral surface of the counter tool.