Rotary heat sealer and method therefor

B - Operations – Transporting – 65 – B

Patent

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Details

B65B 51/16 (2006.01)

Patent

CA 2240053

A rotary heat sealer and method therefor useable for thermally sealing overlapping film layers wrapped about a load at a load wrapping station. The rotary heat sealer includes a plurality of heat sealing disks each having a peripherally disposed heating element, and a rotatable shaft disposed through a central opening of the plurality of heat sealing disks, wherein the heat sealing disks are resiliently coupled to the rotatable shaft by spring members so that the heat sealing disks are rotatable with the shaft and the heat sealing disks are independently movable transverselyrelative to the rotatable shaft axis. The rotary heat sealer is movable toward the load to engage the heating elements thereof with overlapping film layers wrapped about the load to thermally seal an overlapping film tail to underlying film layers, whereby the transversely movable heat sealing disks compensate for variations in the shape of the load, thereby providing improved welding of overlapping film layers.

La présente invention a pour objet une thermosoudeuse rotative ainsi qu'une méthode utilisée pour le thermosoudage des couches superposées de pellicule utilisée dans une machine à envelopper de la marchandise. La thermosoudeuse rotative en question comporte une pluralité de disques de thermosoudage, chacun possédant un élément chauffant monté à sa périphérie et tournant sur un arbre passant à travers une ouverture pratiquée dans le centre de la pluralité de disques; les disques thermosoudeurs tournent solidairement avec l'arbre central auquel ils sont accouplés par l'intermédiaire de ressorts, ceux-ci autorisant le déplacement latéral des disques thermosoudeurs dans l'axe de rotation de l'arbre. La thermosoudeuse rotative est approchée de l'objet à envelopper jusqu'à ce que les éléments chauffants des disques de thermosoudage viennent en contact avec la queue de la pellicule enroulée autour de l'objet pour thermosouder celle-ci aux couches inférieures de pellicule; le mouvement transversal des disques thermosoudeurs permet de compenser les variations dans la forme de l'objet enveloppé, ce qui entraîne un thermosoudage amélioré des couches superposées de pellicule.

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