| 摘要 |
<p>A device for sealing filter bags for products for infusion, where each filter bag is made from a flat web ( 1 ) of filter paper and has applied to it a tag ( 1 b) and a tie string ( 1 a) connecting the tag ( 1 b) to the filter bag itself, comprises at least: a sealing sonotrode element ( 3 ) positioned so that it faces a first path (P) along which the flat web ( 1 ) is fed and so as to seal the string ( 1 a), which is arranged according to a defined pattern, and the tags ( 1 b) to each other and to the flat web ( 1 ) of filter paper'.; drive means ( 4 ) for imparting to the sealing sonotrode means ( 3 ) a defined motion towards and away from a sealing position; the drive means ( 4 ) in turn comprising first means ( 5 ) acted upon by the sealing sonotrode element ( 3 ) and designed to apply a predetermined force (F) to the sealing sonotrode element ( 3 ) itself; second means ( 6 ) for opposing the action of the first means ( 5 ), that is to say, for reducing its intensity, and third control means ( 7 ) for disabling the second means ( 6 ), during predetermined steps of passing the filter bag components under the sealing sonotrode element ( 3 ), so as to permit a predetermined sealing contact.</p> |
