Ultrasonic welding device

摘要

An ultrasonic welding device for the transverse welding of a continuous chain of package blanks movable in a longitudinal direction, the continuous chain of package blanks including a continuous succession of products spaced apart in a longitudinal direction and wrapped in a tubular packaging film.

主权项

1. An ultrasonic welding device for transversally welding a continuous chain of package blanks movable in a longitudinal direction, the continuous chain of package blanks including a continuous succession of products spaced apart in a longitudinal direction and wrapped in a tubular packaging film, the ultrasonic welding device comprising:
a sonotrode unit including a sonotrode hub rotating about a first axis transverse to said longitudinal direction and at least one sonotrode projecting radially from said sonotrode hub; and an anvil unit comprising an anvil hub rotating about a second axis parallel to said first axis and at least one anvil projecting radially from the anvil hub and having at least one welding portion cooperating with said sonotrode for transversely welding said continuous chain of package blanks along welding lines spaced apart along said longitudinal direction, wherein:
said welding portion comprises at least one rib having a welding surface inclined relative to the longitudinal direction and the second axis such that welding contact with the film and the sonotrode occurs along a point that moves progressively from one end of the film to the other in a transverse direction, andsides of the rib curve along an outer surface of the anvil hub.