Method and device for forming a top film sheet from a film web

Abstract

The invention relates to a method and a device for forming a top film sheet from a film web wound on a roll and for setting it onto an object to be packaged. In the method, the end of the film web is gripped over the entire width of the film web to pull it over the object to be packaged. In addition, the film web is gripped before and after the pulling action at a point located at a distance from the cutting line such that, after the cutting has been performed, there remains hanging freely downwards a length of film web that can be gripped for the aforesaid pulling action. In the pulling device (14) performing the pulling of the film web (3), the motion of the pulling jaws (15, 16) between a closed position and an opened position is substantially horizontal. The pulling jaws (15, 16) have been arranged to grip the end of the film web over the entire width of the web. The gripping line of the holding jaws (10, 11) of the holding device (9) is at a distance from the cutting line of the cutting device (13) such that near the free end of the film web there remains hanging freely downwards a length (18) of film web that the pulling jaws (15, 16) can grip to pull the web.

Description

technical field [0001] The invention relates to a method defined in the preamble of claim 1 . Further, the invention relates to the device defined in the preamble of claim 8 . Background technique [0002] Referring to Figure 1 and Figures 1A-1E, a prior art device known through the specification of EP 0,336,517 B1 and through a commercially available packaging machine under the trademark "Octopus" prior art for the The film 3 forms the top film sheet 1 and sets the sheet on the object to be packaged (not shown). The prior art device for setting the sheet comprises a machine frame 4 supported on a fixed base. The machine frame 4 comprises a vertical column 5 whose outline is shown in dashed lines in FIG. 1 . [0003] The device also comprises a frame 6 comprising two parallel guide beams 7 arranged at a distance from each other and fixed at their ends to each other by transverse bars 8 to form a rectangular horizontal frame structure. The frame 6 guided by the vertical c...

AI Technical Summary

Problems solved by technology

This separate assembly work is time consuming and difficult

Due to the notch 34 in the cutting counter holder 19, problems also arise when the film is severed, since in the region of the notch the film can be withdrawn in front of the cutting blade so that in the region of the notch 34 the film cannot be cut completely

In prior art devices this is especially problematic when the membrane is very thin, for example on the order of 15 μm

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