Ultrasonic joining method and ultrasonic joining device

Patent metadata

Field	Value
Publication number	US-9399330-B2
Application number	US-201414561456-A
Country	US
Kind code	B2
Filing date	Dec 5, 2014
Priority date	Dec 12, 2013
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

An ultrasonic joining method for connecting paper material ( 5 ), in particular paper, board or paperboard, comprising the following steps: introducing the paper material ( 5 ) into a gap ( 4 ) between a sonotrode ( 2 ) and an anvil ( 3 ), causing the sonotrode ( 2 ) to oscillate ultrasonically for the ultrasonic welding of the paper material ( 5 ), the paper material ( 5 ) being moistened with demineralized water ( 9 ), preferably on inner sides of joining points, before and/or during the ultrasonic welding.

First claim

What is claimed is:

1. An ultrasonic joining method for connecting paper material ( 5 ), comprising the following steps:
introducing the paper material ( 5 ) into a gap ( 4 ) between a sonotrode ( 2 ) and an anvil ( 3 ), and
causing the sonotrode ( 2 ) to oscillate ultrasonically for the ultrasonic welding of the paper material ( 5 ),
wherein the paper material ( 5 ) is moistened with demineralized water ( 9 ) during the ultrasonic welding.

2. The ultrasonic joining method according to claim 1 , characterized in that the paper material ( 5 ) is moistened with water vapor.

3. The ultrasonic joining method according to claim 2 , characterized in that the water vapor has a temperature of at least 80° C. during the moistening of the paper material ( 5 ).

4. The ultrasonic joining method according to claim 1 , characterized in that the paper material ( 5 ) is moistened with liquid water ( 9 ), the water having a temperature of 50° C. during the moistening of the paper material ( 5 ).

5. The ultrasonic joining method according to claim 1 , characterized in that water ( 9 ) with a conductivity of at most 100 μS/cm is used for the moistening.

6. The ultrasonic joining method according to claim 1 , characterized in that water ( 9 ) with a conductivity of at most 50 μS/cm is used for the moistening.

7. The ultrasonic joining method according to claim 1 , characterized in that water ( 9 ) with a conductivity of at most 20 μS/cm, is used for the moistening.

8. The ultrasonic joining method according to claim 1 , characterized in that a joining force is applied to the paper material ( 5 ) in the gap ( 4 ) in a joining force direction ( 6 ), ultrasonic friction welding being carried out in which the joining force direction ( 6 ) is not parallel to an oscillation direction ( 7 ) of the ultrasonic oscillation.

9. The ultrasonic joining method according to claim 1 , characterized in that the joining force direction ( 6 ) is perpendicular to an oscillation direction ( 7 ), with a maximum deviation of +/−10°.

10. The ultrasonic joining method according to claim 1 , characterized in that no adhesive and no thermoplastic is used for the ultrasonic joining of the paper material ( 5 ).

11. The ultrasonic joining method according to claim 1 , characterized in that no adhesive, no thermoplastic and no printing ink is used for the ultrasonic joining of the paper material ( 5 ).

12. The ultrasonic joining method according to claim 1 , wherein the paper material ( 5 ) is moistened with demineralized water ( 9 ) on inner sides of joining points.

13. A method for producing a package made of paper material ( 5 ), the method comprising an ultrasonic joining method according to claim 1 .

14. An ultrasonic joining device ( 1 ) for connecting paper material ( 5 ), comprising
a sonotrode ( 2 ) configured to oscillate ultrasonically, and
an anvil ( 3 ), with a gap between the sonotrode and the anvil,
the ultrasonic joining device being configured to weld the paper material ( 5 ) in the gap ( 4 ) by ultrasonic oscillation of the sonotrode ( 2 ),
and further comprising a moistening device ( 18 ) for moistening the paper material ( 5 ) with demineralized water ( 9 ) during ultrasonic welding of the paper material.

15. The ultrasonic joining device according to claim 14 , wherein the paper material ( 5 ) is moistened with demineralized water ( 9 ) on inner sides of joining points.

16. The ultrasonic joining method according to claim 1 , wherein the paper material ( 5 ) is also moistened with water before ultrasonic welding of the paper material.

17. The ultrasonic joining device according to claim 14 , wherein the moistening device ( 18 ) also moistens the paper material ( 5 ) with water before ultrasonic welding of the paper material.

18. The ultrasonic joining method according to claim 1 , wherein the gap ( 4 ) is formed between a flat surface of the ultrasonic horn ( 2 ) and a flat surface of the anvil ( 3 ), and wherein the flat surface of the ultrasonic horn ( 2 ) and the flat surface of the anvil ( 3 ) are parallel to the direction of vibration ( 7 ).

19. The ultrasonic joining method according to claim 8 , wherein the joining force is applied with the anvil ( 3 ).

20. The ultrasonic joining device ( 1 ) according to claim 14 , wherein the gap ( 4 ) is formed between a flat surface of the sonotrode ( 2 ) and a flat surface of the anvil ( 3 ), wherein the flat surface of the sonotrode ( 2 ) and the flat surface of the anvil ( 3 ) are parallel to an oscillation direction ( 7 ) of the ultrasonic oscillation, and wherein the anvil ( 3 ) is configured to be moved in a direction of the sonotrode ( 2 ) in order to generate a joining force ( 6 ).

Assignees

• Bosch Gmbh Robert

Inventors

• Wieduwilt Ulrich

Classifications

• B29C65/08

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

• B29C66/8322

  Joining or pressing tools reciprocating along one axis · CPC title

• B29C66/72328

  Paper · CPC title

• B29C65/081

  having a component of vibration not perpendicular to the welding surface · CPC title

• B31B2100/00

  Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs · CPC title