Herrmann Ultraschalltechnik Gmbh & Co. Kg

Tetra Laval Holdings & Finance S.a.

Ultraschalltechnik Gmbh & Co. Kg

Gerhard Gnad

Arnold Schneider

Nikolay Madzharov

Valentin S Nemkov

Armin Geiger

Bastian Ewald

Ulrich Vogler

Stefan Rau

The present invention concerns a method of detecting the making or breaking of contact of a sonotrode () which is caused to vibrate with a frequency f and a vibration amplitude Awith a counterpart element (). To provide a method with which contact-making or breaking of a sonotrode with a counterpart element can be particularly quickly and inexpensively detected it is proposed according to the invention that the method has the following steps: a) recording a time configuration of the vibration amplitude A() during a first measurement time interval ΔT, and b) determining from the time configuration of the vibration amplitude A() whether making or breaking of contact occurred within the measurement time interval ΔT.

Method for detecting the making or breaking of contact of a sonotrode with a counter-element

The present invention relates to a method for intermittent ultrasonic processing of a length of material, wherein a length of material is moved through between a sonotrode and a counter-tool and the length of material is processed intermittently. In order to specify a method for intermittent ultrasonic processing of a length of material by which the disadvantages of the prior art can be avoided or at least reduced, according to the invention it is suggested that in a processing interval the sonotrode is stimulated by an ultrasonic oscillation with an oscillation amplitude A and in a movement interval the sonotrode is stimulated with an oscillation amplitude B, wherein B&#x3c;A and during the processing interval and during the movement interval the length of material touches both the sonotrode and also the counter-tool.

Method for intermittent ultrasonic processing of a length of material

The present invention relates to a device for the ultrasonic processing of materials, which has an ultrasonic processing system, which comprises: an ultrasound generator, a converter (), a sonotrode (), and a counter tool (); wherein the sonotrode () and/or the counter tool () has a substantially cylindrical sealing surface having at least one elevation () and can be rotated such that, during the processing, the elevation () rotates about the axis of rotation and comes in contact with the material web () during a sealing time, wherein a control apparatus () is provided for the ultrasound generator, to which control apparatus a feedback variable from the ultrasound processing system is fed and which control apparatus determines a manipulated variable therefrom and feeds said manipulated variable to the ultrasound generator, wherein a process variable from the processing process is determined and is linked to the manipulated variable determined by the control apparatus () before the feeding to the ultrasound generator. In order to provide an improved device for the ultrasonic processing of materials having an ultrasonic processing system, a trigger apparatus () is provided, which determines the position of the elevation () and is designed to permit or prevent the linking of the process variable to the manipulated variable in accordance with the position determination.

Device for the ultrasonic processing of materials having a trigger apparatus

The invention relates to an ultrasonic welding apparatus for ultrasonic machining of a material, having at least two sonotrodes and a converter device, which converts an electrical AC voltage into an ultrasonic vibration and sets the at least two sonotrodes in ultrasonic vibration, the at least two sonotrodes being arranged in such a manner that the material to be machined is arranged between them during machining and can at the same time be machined by the at least two sonotrodes. To specify an ultrasonic welding apparatus that allows effective material machining without an undesirable interaction occurring between the two sonotrodes, the converter device according to the invention excites the first sonotrode at a frequency fand the second sonotrode at a frequency f, fbeing greater than f.

Ultrasonic welding apparatus having plurality of sonotrodes

A sealing device for producing sealed packages from a tube of packaging material fed along a path and filled with a pourable food product, comprising: a frame; a pair of jaws movable cyclically with respect to the frame and along part of the path to grip the tube; ultrasonic sealing means carried by a first jaw to seal the tube; and power means including a primary winding fixed to the frame and connectable to an electric energy source, and a secondary winding carried by the first jaw, supplying the sealing means, and receiving electric energy by electromagnetic induction from the primary winding as the first jaw travels past the primary winding; and the device having transformer means supplied by the electric energy source with a first voltage value, and supplying the primary winding with a second voltage value lower than the first voltage value.

Sealing device and method for producing sealed packages of a pourable food product

A device for processing workpieces uses ultrasound, with an resonant system comprising an ultrasound generator, an ultrasound sonotrode, and an anvil, wherein a workpiece is processed between the anvil and the ultrasound sonotrode. The ultrasound generator comprises a regulation means which has a regulation member connected upstream of the ultrasound generator to receive a feedback signal from the resonant system and to generate a regulation variable which is supplied to the ultrasound generator. A connecting point is provided between the regulation member and the ultrasound generator, at which the regulation variable of the regulation member is linked to a process variable from the processing procedure.

Device for processing workpieces

In an apparatus for machining a material web by means of a sonotrode, the pressure force of the sonotrode is determined and is used as a control signal for the advance of the sonotrode, as a result of which the nip height is set.

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Keltern, Germany

Gerhard Gnad