Ultrasonic welding device with preheating unit

Patent metadata

Field	Value
Publication number	US-9821511-B2
Application number	US-201515111182-A
Country	US
Kind code	B2
Filing date	Feb 3, 2015
Priority date	Feb 6, 2014
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

The present invention concerns an apparatus for ultrasonic welding of at least two material webs comprising a processing sonotrode which can be excited with an ultrasonic vibration, a processing counterpart tool and a material web guide which is so designed that the material web can be passed through between the processing sonotrode and the processing counterpart tool, in which there is provided a device for heating at least one material web prior to the welding operation. To provide an ultrasonic welding apparatus which avoids the stated disadvantages and which nonetheless provides a high processing speed it is proposed according to the invention that the device for preheating at least one material web has a preheating sonotrode which can be excited with an ultrasonic vibration.

First claim

The invention claimed is:

1. Apparatus for ultrasonic welding of at least two material webs comprising a processing sonotrode which can be excited with an ultrasonic vibration, a processing counterpart tool and a material web guide which is so designed that the material web can be passed through between the processing sonotrode and the processing counterpart tool, in which there is provided a device for heating at least one material web prior to the welding operation, wherein the device for preheating at least one material web has a preheating sonotrode which can be excited with an ultrasonic vibration, characterised in that the processing sonotrode has a welding surface with a welding surface width a and the preheating sonotrode has a welding surface with a welding surface width b, wherein b is greater than a.

2. Apparatus as set forth in claim 1 characterised in that there is provided a preheating counterpart tool which is associated with the preheating sonotrode, wherein the material web is so adapted that at least one material web, can be passed through between the preheating sonotrode and the preheating counterpart tool.

3. Apparatus as set forth in claim 2 characterised in that the processing counterpart tool is also associated with the preheating sonotrode and the material web guide means is so adapted that the material web can firstly be passed through between the preheating sonotrode and the processing counterpart tool for preheating and then between the processing sonotrode and the processing counterpart tool for welding.

4. Apparatus as set forth in claim 1 characterised in that at least the processing sonotrode is in the form of a rotational sonotrode having a welding surface which is substantially in the form of a cylindrical surface.

5. Apparatus as set forth in claim 4 characterised in that at least the processing counterpart tool is rotatable and has a welding surface which is substantially in the form of a cylindrical surface.

6. Apparatus as set forth in claim 1 characterised in that the processing counterpart tool is in the form of a further processing sonotrode which can be excited with an ultrasonic vibration.

7. Apparatus as set forth in claim 5 characterised in that there is provided a device for rotating the preheating sonotrode and for rotating the processing sonotrode, wherein the device is so adapted that the peripheral speed of the processing sonotrode is greater than the peripheral speed of the preheating sonotrode.

8. Apparatus as set forth in claim 1 wherein b is greater than a by more than 50%.

9. Apparatus as set forth in claim 1 wherein b is approximately twice as great as a.

10. Apparatus as set forth in claim 2 wherein both material webs can be passed through between the preheating sonotrode and the preheating counterpart tool.

11. Apparatus as set forth in claim 4 wherein the preheating sonotrode is in the form of a rotational sonotrode having a welding surface which is substantially in the form of a cylindrical surface.

12. Apparatus as set forth in claim 5 wherein the preheating counterpart tool is rotatable and has a welding surface which is substantially in the form of a cylindrical surface.

13. Apparatus as set forth in claim 6 wherein the processing sonotrode and the further processing sonotrode have different natural frequencies.

Assignees

• Herrmann Ultraschalltechnik Gmbh & Co Kg
• Hermann Ultraschalltechnik Gmbh & Co Kg

Inventors

• Fischer Thomas
• Schneider Arnold

Classifications

• B29C66/81465

  one placed behind the other in a single row in the feed direction · CPC title

• B29C65/088

  using several cooperating sonotrodes, i.e. interacting with each other, e.g. for realising the same joint · CPC title

• B29C66/91411

  of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account · CPC title

• B29C66/919

  characterised by specific temperature, heat or thermal flux values or ranges (specific electrical resistance values B29C66/81262) · CPC title

• B29C65/08 Primary

  using ultrasonic vibrations {(non-plastics element to plastics elements B29C65/645)} · CPC title