Importance

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Abstract

An apparatus for forming and applying a sealing flap to seal the mouth of a filled sack, starting from a continuous strip (9) of heat-sealable material includes a first loop conveyor to unwind the strip from the feeder roll and transfer it, using clamp means (10, 11, 12, 13) and guide means (14), to a second loop conveyor (15), likewise provided with clamp means (21, 22, 23, 24) to hold the strip (9). Between the first and the second conveyor (1, 15) cutting means (28, 29) are provided to cut the strip (9) when the section of the latter transferred to the second conveyor (15) has reached a pre-set length corresponding to the width of the sack (31) to be sealed. The second conveyor is associated with a shaping device (26) which, during advance of the strip (9), folds the strip itself until it is substantially in the shape of an upside down U, thus forming the sealing flap (32). The second conveyor (15) moves between a first upturned position around the end adjacent to the first conveyor (1), corresponding to the formation stage of said sealing flap (32), and a horizontal position, corresponding to the positioning stage of the sealing flap (32) over the mouth of the sack (31) to be closed ready for subsequent sealing. (FIG. 1)

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First Claim