Method for producing packaging, and packaging machine
The invention relates to a method for producing packaging ( 18 ) from paper material ( 5 ), in particular paper, cardboard or paperboard, said method comprising the following steps: forming packaging ( 18 ) from a blank ( 19 ) made of paper material ( 5 ), which paper material overlaps at at least one joining site ( 21 ); positioning the at least one joining site ( 21 ) between a sonotrode ( 2 ) and an anvil ( 3 ); applying the joining site ( 21 ) with a joining force in a joining force direction ( 6 ); and making the sonotrode ( 2 ) ultrasonically vibrate in order to ultrasonically weld the paper material ( 5 ) at the joining site ( 21 ), which method is characterised in that the paper material ( 5 ) is moistened, preferably on the inner sides of the joining sites ( 21 ), before forming the packaging ( 18 ) and/or while forming the packaging ( 18 ) and/or after forming the packaging ( 18 ) and/or during the ultrasonic welding.
1. A method for producing packaging ( 18 ) from paper material ( 5 ), said method comprising the following steps:
forming packaging ( 18 ) from a single blank ( 19 ) made of paper material ( 5 ), wherein the single blank includes a first lug ( 20 ) and a second lug ( 20 ) spaced from the first lug ( 20 );
bringing the first lug ( 20 ) and the second lug ( 20 ) into an overlapping relationship with respect to one another, thereby forming at least one joining site ( 21 );
positioning the at least one joining site ( 21 ) between a sonotrode ( 2 ) and an anvil ( 3 );
applying a joining force to the at least one joining site ( 21 ) in a joining force direction ( 6 );
making the sonotrode ( 2 ) ultrasonically vibrate, thereby ultrasonically welding the first lug ( 20 ) and the second lug ( 20 ) of the paper material ( 5 ) together at the at least one joining site ( 21 ); and
moistening the paper material ( 5 ) at one or more of the following times: before forming the packaging ( 18 ); while forming the packaging ( 18 ); after forming the packaging ( 18 ); and during the ultrasonic welding,
wherein the ultrasonic welding includes ultrasonic friction welding during which the joining force direction ( 6 ) is not parallel to a direction of vibration of the ultrasonic vibration,
characterized in that the joining force direction ( 6 ) is perpendicular to the direction of vibration ( 7 ), with a maximum deviation of ±10°.
2. The method according to claim 1 , characterized in that the ultrasonic vibration frequency of the sonotrode ( 2 ) lies between 20 and 40 kHz.
3. The method according to claim 1 , characterized in that an adhesive and a thermoplastic are not used for the ultrasonic welding process.
4. The method according to claim 1 , characterized in that a common anvil ( 3 ) and/or a common sonotrode ( 2 ) are/is used for a plurality of joining sites ( 21 ) that are spaced apart from one another.
5. The method according to claim 1 wherein the paper material ( 5 ) is moistened on inner sides of the joining site.
6. The method according to claim 1 , characterized in that the ultrasonic vibration frequency of the sonotrode ( 2 ) lies between 30 and 35 kHz.
7. The method according to claim 1 , characterized in that an adhesive, a thermoplastic and a printing dye are not used for the ultrasonic welding process.
8. The method according to claim 1 , wherein the step of applying the joining force includes moving the anvil against the sonotrode.
9. The method according to claim 8 , wherein the anvil is moved via a cylinder rod.
10. A method for producing packaging ( 18 ) from paper material ( 5 ), said method comprising the following steps:
forming packaging ( 18 ) from a single blank ( 19 ) made of paper material ( 5 ), wherein the single blank includes a first lug ( 20 ) and a second lug ( 20 ) spaced from the first lug ( 20 ), wherein the first lug ( 20 ) and the second lug ( 20 ) are folded or bended by a folding tool ( 15 ) from the single blank ( 19 ), and wherein a common sonotrode ( 2 ) and a common anvil ( 3 ) are integrated in the folding tool;
bringing the first lug ( 20 ) and the second lug ( 20 ) into an overlapping relationship with respect to one another, thereby forming at least one joining site ( 21 );
positioning the at least one joining site ( 21 ) between the common sonotrode ( 2 ) and the common anvil ( 3 );
applying a joining force to the at least one joining site ( 21 ) in a joining force direction ( 6 );
making the sonotrode ( 2 ) ultrasonically vibrate, thereby ultrasonically welding the first lug ( 20 ) and the second lug ( 20 ) of the paper material ( 5 ) together at the at least one joining site ( 21 ); and
moistening the paper material ( 5 ) at one or more of the following times: before forming the packaging ( 18 ); while forming the packaging ( 18 ); after forming the packaging ( 18 ); and during the ultrasonic welding,
wherein the paper material ( 5 ) is moistened on inner sides of the joining site;
wherein the ultrasonic welding includes ultrasonic friction welding during which the joining force direction ( 6 ) is not parallel to a direction of vibration ( 7 ) of the ultrasonic vibration,
wherein the common anvil ( 3 ) and the common sonotrode ( 2 ) are used for a plurality of joining sites ( 21 ) that are spaced apart from one another, characterized in that the joining force direction ( 6 ) is perpendicular to the direction of vibration ( 7 ), with a maximum deviation of ±10°.
11. A method for producing packaging ( 18 ) from paper material ( 5 ), said method comprising the following steps:
forming packaging ( 18 ) from a single blank ( 19 ) made of paper material ( 5 ), wherein the single blank includes a first lug ( 20 ) and a second lug ( 20 ) spaced from the first lug ( 20 );
bringing the first lug ( 20 ) and the second lug ( 20 ) into an overlapping relationship with respect to one another, thereby forming at least one joining site ( 21 );
positioning the at least one joining site ( 21 ) between a sonotrode ( 2 ) and an anvil ( 3 );
applying a joining force to the at least one joining site ( 21 ) in a joining force direction ( 6 );
making the sonotrode ( 2 ) ultrasonically vibrate, thereby ultrasonically welding the first lug ( 20 ) and the second lug ( 20 ) of the paper material ( 5 ) together at the at least one joining site ( 21 ); and
moistening the paper material ( 5 ) at one or more of the following times: before forming the packaging ( 18 ); while forming the packaging ( 18 ); after forming the packaging ( 18 ); and during the ultrasonic welding,
wherein the ultrasonic welding includes ultrasonic friction welding during which the joining force direction ( 6 ) is not parallel to a direction of vibration ( 7 ) of the ultrasonic vibration,
wherein the ultrasonic vibration frequency of the sonotrode ( 2 ) lies between 30 and 35 kHz,
wherein an amplitude of the ultrasonic vibration of the sonotrode ( 2 ) lies between 20 μm and 40 μm, characterized in that the joining force direction ( 6 ) is perpendicular to the direction of vibration ( 7 ), with a maximum deviation of ±10°.