Application of zippers to film material
AssigneeSupreme Plastics Holdings Kimited
InventorMurray Leighton
Life of this patent
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Abstract
The apparatus applies a transverse zipper strip to a film (10) moving continuously in a direction (12). A continuous belt (18) is driven by sprocket wheels (16a, 16b) and carries upper seal bars (22a, 22b, 22c) which receive pre-cut lengths of zipper at station (3). The pre-cut lengths are attached to the film (10) by a lower seal bar (24) which moves towards the film (12) at position A when an upper seal bar carrying a zipper strip is located directly above the film. Sealing takes place as the upper and lower seal bars move at the same speed as the film (12) from position A to position B where the zipper is released from the upper seal bar (22c). The process then repeats for the next zipper strip length.
Claims9
Apparatus for applying a zipper strip to a film transversely to the direction of movement of the film, comprising means for causing the film to move continuously at constant speed, applicator means arranged to receive the zipper strip, to present it to the film at a first location and to advance the strip downstream at the same speed as the film, and sealing means arranged to move downstream at the same speed as the film to effect sealing of the strip to the film between said first location and a second location downstream from said first location.
Apparatus according to claim [3 or]4, in which the continuous band is externally slotted to receive therein the plurality of strip-receiving units.
A method of applying a zipper strip to a film transversely to the direction of movement of the film, which comprises moving the film continuously at constant speed, presenting the zipper strip to the film at a first location, arranging for sealing means to begin sealing of the strip to the film at said first location, and moving the sealing means with the zipper strip at the same speed as the film to a second location at which sealing has been completed.
Dependencies are inferred from the claim text.