| 摘要 |
The present invention relates to a method, use of the method and a device for making a seal ( 9 ) in a portion ( 7 ) of a material web ( 1 ). The material web ( 1 ) comprises a first elongate section ( 2 ) with a first number of layers of material ( 20, 21 ), and a second elongate section ( 3 ) with a second number of layers of material ( 20 ), at least one of said layers of material ( 20 ) being included in both the first and the second section ( 2, 3 ), said portion ( 7 ) having an extent that intersects a transition ( 5 ) from the first section ( 2 ) to the second section ( 3 ) of the material web ( 1 ), the method comprising connecting, in said portion ( 7 ), opposite surfaces of the layers of material ( 20, 21 ) of the material web ( 1 ) to each other. The inventive method is characterised by forming ridges ( 15 ) and valleys ( 16 ) in said portion ( 7 ), and orienting said ridges ( 15 ) and valleys ( 16 ) in such a manner that they have an extent intersecting said transition ( 7 ).
|
