Speed independent sealing
OwnerGert Holmstrom, Karin Berg +1inventors
InventorsGert Holmstrom, Karin Berg, Anders Wiberg
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Abstract
The present invention concerns a method and a device for sealing packages (1) during continuous movement. A row of packages (1) is driven by means of a motor (8) through a sealing station comprising an inductor (4). The inductor (4) is driven in a pulse form by means of an IH (induction heating) inductor (5). A PLC system (6) is used to control the IH generator (5). The PLC system (6) receives information regarding speed and position of the packages (1) by means of a motor drive (9) and an encoder (7), respectively.
Claims11
A method of sealing packages (1) during continuous movement, in which a row of packages (1) is driven by means of a motor (8) through a sealing station comprising an inductor (4), characterized in that the inductor (4) is driven in a pulse form, that the pulses are of a fixed length and that the time between the pulses vary depending on the speed of the row of packages (1).
The method of any of the previous claims, characterized in that the applied power is adjusted depending on the speed.
The method of any of the previous claims, characterized in that each package (1) of the row of packages (1) has the same length (lp) in the feeding direction and that the packages (1) are separated by a distance (ls) from each other.
The method of claim 7, characterized in that the length (li) of the inductor (4) in the feeding direction of the packages (1) is the same as the length (lp) of one package plus the length (ls) of the space between two adjacent packages (1).
The method of any of the previous claims, characterized in that each package is given a constant sealing energy throughout the length (lp) of the package (1).
The method of any of the previous claims, characterized in that the first package (1) of the row of packages (1) triggers the sealing system at start-up.
A device for continuous sealing of packages (1) in a sealing station comprising an inductor (4), whereby a row of packages (1) is driven by means of a motor (9) through the sealing station passing the inductor (4), consisting of two plates on each side of the row of packages (1), characterized in that an IH (induction heating) generator (5) is connected to the inductor (4) and that the IH generator (5) is controlled by a PLC system (6) connected to the IH generator (5).
Dependencies are inferred from the claim text.