Method of sealing an end fin of a carton
US8011169B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 2007 |
| Grant date | Sep 6, 2011 |
| Priority date | — |
| Expiry date | Feb 29, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7166
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An ultrasonic sealing device for a top fin of a gable-topped carton includes two jaws consisting of a jaw (2) with a planar active face and constituting the outer end portion of an ultrasonic horn (A1) and a jaw (6) constituting an anvil and having an active surface (10) which is planar except for upper and lower linear ribs (12) and (14) each extending the length of the surface (10). The lower rib (14) is linear and horizontal except for an upwardly bowed middle portion (16). The two jaws (2) and (6) serve to render gas-and-liquid tight a top fin of a conventional, plastics-coated paperboard, gable-top carton. The ribs (12) and (14) produce, in the outer surface of one of the outer sealing panels of the fin, corresponding furrows which extend over the whole length of the fin at levels where the inner sealing panels are sandwiched between the outer sealing panels, so as to seal the top fin in a gas- and liquid-tight manner along its whole length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.