Sealing apparatus for packaging containers

B - Operations – Transporting – 65 – B

Patent

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Details

B65B 51/22 (2006.01) B29C 65/00 (2006.01) B29C 65/08 (2006.01)

Patent

CA 2165542

A sealing apparatus for packaging containers includes an anvil (23) for supporting a sealing fin portion (21), a horn (35) composed of a columnar portion and a converging portion (35b), and means for pressing said sealing fin portion (21) against the anvil (23) through the tip of the horn (35) and for transmitting ultrasonic vibration to the sealing fin portion (21). Ultrasonic vibration is transmitted to the packaging material through the horn (35) so that each pair of opposing sealant layers is fused and sealed. In addition, means for absorbing ultrasonic vibration is disposed between the tip of the horn (35) and an edge portion (25) of the sealing fin portion (21) so that ultrasonic vibration is absorbed. When ultrasonic vibration is transmitted to the sealing fin portion (21), the sealing fin portion (21) is excited to transmit the vibration toward the edge portion (25). However, since the ultrasonic vibration is absorbed by the means for absorbing ultrasonic vibration, the ultrasonic vibration is not transmitted to the edge portion (25). Accordingly, it is possible to prevent the generation of dust from an end surface of the paper substrate which is exposed at the edge portion (25) of the sealing fin portion (21) .

Cet appareil possède une enclume (23) sur laquelle viennent s'appuyer des ailettes de fermeture étanche (21), un pavillon consistant en une partie cylindrique et en une partie convergeant vers l'avant (35b), et des moyens pour comprimer les ailettes de fermeture étanche (21) contre l'enclume (23) par l'intermédiaire de l'extrémité frontale du pavillon (35) et transmettre des vibrations ultrasoniques aux ailettes de fermeture étanche (21). Le pavillon (35) est adapté pour transmettre des vibrations ultrasoniques à un matériau d'emballage, fusionner les couches d'étanchéité des ailettes (21) les unes aux autres et sceller le matériau de conditionnement. Des moyens d'absorption des vibrations ultrasoniques sont prévus entre l'extrémité frontale du pavillon (35) et les bords (25) des ailettes (21) et sont adaptés pour absorber les vibrations ultrasoniques. Les ailettes (21) sont excitées lorsqu'elles reçoivent des vibrations ultrasoniques, ces vibrations ultrasoniques progressant vers les bordures (25) et étant absorbées par les moyens d'absorption de sorte qu'elles ne sont pas transmises aux bordures (25). En conséquence, la poussière n'apparaît pas dans les surfaces extrêmes des substrats en papier exposées au niveau des bordures (25) des ailettes de fermeture étanche (21).

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