NL1032565C1 - Corner seal unit for continuous motion vertical packaging machine, comprises forming shoulders, forming blocks, film flattening roll, sealing unit and film guide plates - Google Patents

Abstract

The unit (1) includes a forming shoulder (5) which converts a flat web of film (3) into a curved web (7) with a reduced width, forming blocks (9) which form spaced apart rectilinear protrusions in the flat web, a roll (11) for flattening the film again so that it has overlapping sections (13) with a defined width, and a unit (17, 19) for sealing together the overlapping sections on the inner side of the film. Guide plates (15) between the forming blocks and roll are used to supply the folded film to the desired width position on the roll.

Description

Comerseal unit for vertical continous motion packaging machine DESCRIPTION: 5

FIELD OF THE INVENTION

The invention relates to a comerseal unit for vertical continuous motion packaging machine.

A comerseal unit has the function of providing additional seal seams in the feed-through direction of the film in order to realize desired bag shapes. Possible bag shapes are standing bags and comerseal bags. The seal seam dimensions and position are variable.

Prior art.

Such a comerseal unit is generally known.

Summary of the invention.

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An object of the invention is to improve the known comerseal unit. To this end, the comerseal unit according to the invention is characterized in that the comerseal unit comprises a mold shoulder which converts a flat film web into a curved film web with a reduced width, as well as mold blocks which make straight jumps in the flat film, and a roller which flatten the film again with overlapping sections with a defined width, and a sealing unit that seals the overlapping film parts on the inside of the film to each other, with control plates present between the mold blocks and the roller, which place the folded film at the desired width position on the roller. to offer.

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Brief description of the drawings.

1032565 2

The invention will be explained in more detail below with reference to an exemplary embodiment of the comerseal unit according to the invention shown in the drawings. Hereby shows:

Figure 1 shows an embodiment of the comerseal unit according to the invention; 5 and

Figure 2 is a sectional view of the detail C shown in Figure 1

Detailed description of the drawings.

Figures 1 and 2 show a comerseal unit for vertical continuous motion packaging machine. The comerseal unit 1 places the corner seams in the foil before it is pulled over the format shoulder of the format. The unit is therefore located between the film roll and the format.

A few sub-units have been brought together in one compact comerseal unit. This 15 unit can optionally be added to a continous motion machine. For the sake of accessibility, this option is positioned on the outside of the machine.

The unit 1 consists of the following sub-units: - mold shoulder 5, - mold blocks 9 with roller 11, 20 - seal station 17,19, - drive 23 (optional)

The operation of the comerseal unit is as follows. A flat foil web 3 enters the comerseal unit 1 and is converted by means of a forming shoulder 5 into a curved foil web 7 with a reduced width. This curved foil runs through the, individually adjustable, shape blocks 9 and leaves them in tilt form, see detail A (flat foil with straight jumps).

By subsequently tensioning this tilt-like film over a roller 11, a completely flat film web is created with overlapping sections 13 with a defined width, see detail B. The width of the overlap ultimately determines the width of the comerseal and finds its origin in the tilt height.

In order to accurately position the comerseals 13 in the film web, control plates 15 are provided after the mold blocks 9 which offer the folded film to the roller 11 at the desired width position, see figure 2 in which detail C is shown in section.

Under the influence of temperature and pressure, the overlapping foil parts 13 on the inside of the foil are sealed together in a sealing unit. This sealing unit consists of a heated sealing bar 17 and a pressure strip 19.

Depending on the film properties, optionally after a further roller 21 a driven roller 23 can further transport the film 3. Because the actual forming of the comerseal takes place largely without contact, the frictional forces are minimal, so that an additional foil drive is not required as standard.

Although in the foregoing the invention has been elucidated with reference to the drawings, it must be stated that the invention is by no means limited to the embodiment shown in the drawings. The invention also extends to all embodiments deviating from the embodiment shown in the drawings within the scope defined by the claims.

1032565

Claims (1)

A comerseal unit for vertical continuous motion packaging machine, characterized in that the comerseal unit comprises a form shoulder which converts a flat film web into a curved film web with a reduced width, as well as mold blocks, which makes 5 straight jumps in the flat film, and a roller, which again flattens the foil with overlapping sections of a defined width, and a sealing unit that seals the overlapping foil parts on the foil inside together, whereby control plates are present between the mold blocks and the roller, which guide the folded foil to the desired width. offer position to the roller. 1032565