Back to results
US 8,011,169 B2Granted
Method of sealing an end fin of a carton
AssigneeElopak Systems AG
InventorPeter Nils Adler
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeElopak Systems AG
InventorPeter Nils Adler
Estimating the term…
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.
A jaw for use in sealing of an end fin of a packaging carton, which fin comprises first and second outer sealing panels and first and second inner sealing panels which are sandwiched between said outer sealing panels and each folded upon itself and which are so disposed between said outer sealing panels as to produce a central incipient channel bounded by said outer sealing panels and inwardly folded edges of the respective inner sealing panels, said jaw comprising a sealing rib extending longitudinally of an active face of said jaw and comprising respective opposite end portions extending longitudinally of said active face and, between said end portions adapted to seal said central incipient channel transversely, a bowed middle portion, the arrangement being such that, during the sealing, the bowing of said middle portion is away from the middle of the carton, there being substantially no sealing protrusions to that side of said rib which, during the sealing, is towards the middle of the carton.
A method of sealing an end fin of a packaging carton, which fin comprises first and second outer sealing panels and first and second inner sealing panels which are sandwiched between said outer sealing panels and each folded upon itself and which are so disposed between said outer sealing panels as to produce a central incipient channel bounded by said outer sealing panels and inwardly folded edges of the respective inner sealing panels, comprising temporarily clamping said fin between sealing jaws and thereby forming, along said fin, a line of pressure and thereby a seal among said outer sealing panels and said inner sealing panels comprising respective opposite end portions extending longitudinally of said fin and, between said end portions, a middle portion bowed away from the middle of the carton, thereby promoting closure of said central incipient channel, the degree of sealing pressure produced by said clamping being greater than any produced by said jaws at any location between said line and the middle of said carton.
A packaging carton including an end fin comprising first and second outer sealing panels and first and second inner sealing panels which are sandwiched between said outer sealing panels and each folded upon itself and which are so disposed between said outer sealing panels as to produce a central incipient channel bounded by said outer sealing panels and inwardly folded edges of the respective inner sealing panels, and a linear seal formed among said outer sealing panels and said inner sealing panels and comprising respective opposite end portions extending longitudinally of said fin and, between said end portions, a middle portion bowed away from the middle of the carton, whereby closure of said central incipient channel has been promoted, sealing tightness per unit area at said linear seal being greater than at any location between said linear seal and the middle of said carton.
Dependencies are inferred from the claim text.