| 摘要 |
<p>An apparatus for connecting web materials 1000 by thermo-fusion comprises a thermal energy emitting source, such as an ultrasonic sonotrode 2000; a web guide means and a helical anvil 3000. A process thereof for thermo-fusing web materials comprises the steps guiding the web(s) through a nip between the thermal energy emitting means and the helical anvil; compressing the thermal energy emitting means against the web(s) positioned and held on the anvil to achieve ultrasonic welding of the webs. Preferably, a bonding curve shaping device (5000, figure 2A) is provided for positioning the helical anvil into a pre-determined shape such as to vary the bond curves in the web. The helical anvil may be formed with a helix diameter 3020 formed by a wire wound around cylinder to produce bonding spots 4000. Laterally movable fixation points may be moved to change the shape of the bonding curve this alters the shape and pattern of the bonded seam.</p> |
