B - Operations – Transporting – 65 – B
Patent
B - Operations, Transporting
65
B
B65B 51/22 (2006.01) B06B 3/00 (2006.01) B29C 65/08 (2006.01)
Patent
CA 2178972
The invention relates to a method for steering resonance frequencies of interfering oscillation modes. The invention is applicable to that type of ultrasound sealing unit (1) which has a drive unit (2), centrally placed above the point of intersection between the two planes of symmetry (8) into which the sealing unit may be divided. The sealing unit (1) has reaction bodies (3) surrounding the drive unit (2), and a horn (4) with an elongate, narrow sealing surface (5). The sealing unit has a nodal plane between the reaction bodies (3) and the horn (4) in which plane the sealing unit is fixed with the aid of the anchorage edge (7). The resonance frequencies of the interfering oscillation modes which negatively influence the function of the sealing unit are steered in that symmetrically placed grooves (9) are provided in the reaction bodies (3). The grooves (9) are placed where the interfering oscillation modes have a maximum of potential, or alternatively a maximum of displacement.
Marks & Clerk
Rabe Magnus
Tetra Laval Holdings & Finance S.a.
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