EP1990278A1 - Hose shaped device and method for forming a half-hose film - Google Patents

Abstract

The device (1) has an upper shaping shoulder (7) and a lower shaping shoulder (6) exhibiting lower and upper shaping edges (8, 9, 12, 13). The upper shaping shoulder is arranged parallel to the lower shaping shoulder. The upper shaping edges (12, 13) are located under an angle of ninety degree to each other and exhibit an upper shaping shoulder point (21). The upper shaping edge (13) runs parallel to the lower shaping edge (9) and the upper shaping shoulder point is brought back to an angle opposite to a lower shaping shoulder point (20). An independent claim is also included for a method for shaping a foil half bag by a bag shaping device.

Description

The invention relates to a tube forming device for forming a longitudinally folded Folienhalbschlauches with a lower film and a top film of a moving endless film web with a substantially flat upper and lower forming shoulder with upper and lower edges for a horizontal packaging machine.

These known tube forming devices is usually fed perpendicular to the transport direction of the packaged by a supply roll a film web as a half tube and deflected by the tube forming device in the packaging direction of the machine 90 °, wherein in the region of the tube forming device usually the packaged product is placed between the top film and the bottom film. The tube-forming device has for this purpose a substantially flat upper forming shoulder and a substantially flat lower forming shoulder, which are arranged at an angle of 45 ° to the transport direction on. To improve the film guide, the forming shoulders may have protruding edges and guides from the surface. The packaged product is brought via a feed belt in the region of the tube forming device and in this area of the conveyor belt of Verpakkungsmaschine accepted. Depending on the requirements of the packaging, the packaging material and the speed of packaging, the transfer belt may protrude into or terminate in the area between the upper and lower forming shoulders. In the latter embodiment, this means that the two are arranged at 45 ° in the transport path projecting form shoulders above the conveyor belt of the machine.

By this 45 ° arrangement, it is a problem with different types of packaged goods and their orientation during transport and the different speeds between the feed belt and the conveyor belt of the machine to transport the packaged goods at the desired speed and without tilting on the lower film. This is due to the fact that, in the case of a transfer edge running at 45 ° to the transport direction, a region arises between the supply belt and the conveyor belt of the machine in which the packaged goods are only partially located on the lower film. In particular, if the transport is carried out at the feed belt by means of a multi-track finger chain and the feed belt is to be used variably for different product widths, this resulting 45 ° range is a problem for the clean product management. This is encountered in certain applications that in the 45 ° area additional transport rollers are arranged and thereby a symmetrical transfer edge is realized.

The present invention is therefore based on the object to provide a tube forming device and a method for forming a film half tube, in which a provided perpendicular to the transport direction transfer edge between the feed belt and the conveyor belt of the packaging machine is present, and thereby the packaged after leaving the feed belt over the whole Width of the packaged goods on the lower film of the film half tube passes.

This object is achieved by a hose molding apparatus and a method with the features of claim 1 and of the independent sibling Procedure claim solved. Further advantageous embodiments can be found in the respective dependent subclaims.

In accordance with the invention, the lower forming shoulder has a first lower forming edge and a second lower forming edge angled at 45 ° to the first lower forming edge, which together form a lower forming shoulder tip. Parallel to the lower forming shoulder there is an upper forming shoulder having a first upper forming edge and a subsequent second upper forming edge angled 90 ° therefrom and forming an upper forming shoulder tip. In this case, the second upper mold edge runs parallel to the second lower mold edge and the upper mold shoulder tip is set back relative to the lower mold shoulder tip by an angle α. In order that the formation of the half-tube film can take place in the desired manner, the film web must be moved against the transport direction of the packaged below the lower mold shoulder and then deflected around the lower mold edges, wherein, as desired, the lower mold edge at the lower mold shoulder perpendicular to The transport direction of the packaged goods and thus to arrange the feed belt is the deflection around the first under mold edge then takes place by 180 ° and the second lower mold edge by an angle greater than 90 ° but significantly smaller than 180 °. The angle results from the parallel displacement of the second upper forming edge to the second lower forming edge. The transition of the packaging material from the feed belt to the lower film of the film half-tube thus takes place over the entire width of the packaged goods. A lateral rotation of the packaged goods for certain sizes is thus excluded, so that any packaged widths can be passed easily even when feeding mehrspuriger fingerchains.

Another advantage of this tube forming device is that now the supply of the film web is no longer transversely to the transport direction but over the entire film width opposite to the transport direction. The supply roll for the film web can thus be arranged below the tube forming device and preferably by means of a deflection below the conveyor belt of the packaging machine opposite to the transport direction of the packaged below the lower mold shoulder are guided to the lower edges of the lower mold shoulder form. This simplifies the structure of the storage of the supply roll. Optionally, the supply roll can also be arranged at 90 °. Then the film is more accessible and it can be driven larger diameter. However, this means an additional deflection by 90 ° before reaching the Formschulter.

The lower and upper forming shoulders are conventionally secured to a support frame at the rear end remote from the forming shoulder tips, and in addition, the upper forming shoulder may have a spacer in the region of the forming shoulder tips in a foil-free region to ensure sufficient stability.

In order for the different run lengths to form the upper and lower foils for the film half-tube to be compensated, it is necessary that the upper form shoulder is set back with the upper Formschulterspitze relative to the lower Formschulterspitze. To ensure a wrinkle-free course in the region of the forming shoulders, in particular the upper forming shoulder and a straight course of the film half-tube, according to a preferred embodiment, the angle at which the upper forming shoulder tip is recessed is 67.5 °.

For optimum guidance of the films with different materials, it may additionally be expedient to provide the tip of the upper forming shoulder with a bend so as to achieve a better rounding. This is particularly advantageous for polypropylene films.

According to a preferred embodiment, the lower forming shoulder is formed as a non-isosceles trapezoid, wherein the angled trapezoidal edge is the second lower edge form and the opposite edge can basically be configured arbitrarily, since it plays no role in the formation of the half-tube.

Advantageously, the upper form shoulder is formed as a right-angled isosceles triangle, in which case, the edge forming the hypotenuse, in the formation of the half-tube is of no importance. The guide of the film takes place only over the two legs of the triangle, which form the first and second upper edge form.

For height adjustment, the upper form shoulder is expediently moved in parallel with the upper form shoulder tip at the angle α. For this purpose, a correspondingly inclined holding device may be provided, on which the upper forming shoulder can be fastened and fastened in the desired height. For adjustment at different heights, this requires that the supply roll or the film web be adjusted so that the lower form shoulder tip is aligned with the width of the lower film.

The film guide is made such that the film web as mentioned counter to the direction of movement of the finished Folienhalbschlauchs below the lower forming shoulder, to form the lower film a longitudinal half of the film web at the arranged perpendicular to the movement direction first lower edge of the lower forming shoulder by 180 °, to form the Upper foil deflects the other longitudinal half of the film web at the second lower forming edge arranged at an angle of 45 ° to the first lower forming edge and 180 ° at the second upper forming edge of the upper forming shoulder arranged parallel to the second lower forming edge and then transversely to the transport direction of the packaged product over the upper forming shoulder running part of the other longitudinal half at the arranged at an angle of 90 ° to the second upper mold edge first upper mold edge at an angle of 45 ° as a top film in the direction of movement of the film half tube umgel is reduced.

By means of this tube forming device and the indicated film guide, it is thus possible to simplify the overall film feeding and shaping of the half tube and to make cheaper, while the product feed due to the direction perpendicular to the transport direction of the packaged goods arranged transfer edge between the feed belt and the tube forming device or the conveyor belt of the machine is also simplified, while allowing a higher variability.

Further features of the invention will become apparent from the following description of an embodiment in conjunction with the claims and the drawings. The individual features may be implemented individually or in several embodiments of the invention.

Figur 1

die prinzipielle schematische Ausbildung und Anordnung der Schlauchformeinrichtung mit der oberen und unteren Formschulter mit dem Verlauf der Folien im Bereich der Formschultern;

Figur 2

die schematische Darstellung und die Draufsicht auf die Anordnung der Schlauchformeinrichtung zwischen einem Zuführband und einem Transportband der Verpackungsmaschine;

Figur 3

die schematische seitliche Darstellung der oberen und unteren Formschulter zueinander; und

Figur 4

die Draufsicht auf die Faltkanten an einer Folienfläche.

They show:

FIG. 1

the schematic schematic design and arrangement of the tube forming device with the upper and lower forming shoulder with the course of the films in the region of the forming shoulders;

FIG. 2

the schematic representation and the top view of the arrangement of the tube forming device between a feed belt and a conveyor belt of the packaging machine;

FIG. 3

the schematic side view of the upper and lower forming shoulder to each other; and

FIG. 4

the top view of the folded edges on a film surface.

FIG. 1 shows a tube forming device 1 with the expiring in the direction of arrow 2 film half-tube 3 with the top film 4 and the bottom film 5. The lower forming shoulder 6 and the upper forming shoulder 7 are parallel to each other with a minimum distance in the height of the product to be packed arranged to each other, wherein the upper forming shoulder 7 is offset by the angle α of 67.5 ° with respect to the lower forming shoulder 6 in the direction of arrow 2. The lower forming shoulder 6 has a first lower forming edge 8 and a second lower forming edge angled at 45 ° thereto, thereby forming a common lower forming shoulder tip 20. The side edge 10 of the lower forming shoulder 6 has for the film guide no meaning and projects beyond the half-tube 3, for example, so that different heights can be generated with a tube forming device. The upper forming shoulder 7, which, like the lower forming shoulder 6, is formed flat at least in the film guiding area, has a first upper forming edge 12 and a second upper forming edge 13. The first upper forming edge 12 and the second upper forming edge 13 are at an angle of 90 ° to each other and thereby form the upper forming shoulder tip 21 with a triangular surface area 23. The second upper forming edge 13 is parallel to the second lower forming edge 9. In the foil-free area between the two forming shoulders 6, 7 is located in the vicinity of the forming shoulder tips 20, 21, a spacer 14, which is indicated here schematically.
Below the lower forming shoulder 6 is a supply roll 15 with the film web 18 which is mounted on an axle 16. The film web 18 is unwound from the supply roll 15 and runs around an arranged below the lower forming shoulder 6 guide roller 17 along the bottom of the lower mold shoulder 6 to the lower mold edges 8, 9 of the lower mold shoulder 6. At the lower mold edge 8, the lower film 5 of Folienhalbschlauches 3 formed by deflection by 180 °. The other part of the film web 18, which forms the upper film 4 together with the product height corresponding portion 11 of the film half tube is on the second lower mold edge 9 and the second upper mold edge 13, as indicated by the arrow 22, on top of the upper mold shoulder 7 deflected and guided over the tip portion 19 perpendicular to the direction of movement of the lower film extending below the upper forming shoulder 7 to the first upper edge form 12 and deflected there by 45 ° in the direction of arrow 2.

FIG. 2 shows the tube-forming device 1 between a feed wall 26 and a conveyor belt 27 of the packaging machine, not shown, in which the film half-tube is further processed with the packaging material inserted. The transfer edge 28 of the feed belt 26 is perpendicular to the transport direction 29 of the packaged goods as well as the first lower mold edge 8 of the lower Form shoulder 6, so that the transfer of the packaging material, not shown, takes place in the desired manner.

FIG. 3 shows the position of the upper Formschulterspitze 21 to the lower Formschulterspitze and the movement of the upper Formschulter 7 along a holding and guiding means 24. Also, the holding and guiding means 24 is inclined by the angle α. This results in a parallel displacement of the upper form shoulder 7 in the arrow direction, the fixation of the upper form shoulder 7, for example, in a conventional manner within a slot 25 by means not shown and familiar to those skilled fixation elements, such as clamping lever done.

FIG. 4 Finally, the plan view of the folded edges of a film, wherein the individual fold edges are provided with the reference numerals of the corresponding edges on the tube forming device. The film web 18 is subdivided into the lower film 5, upper film 6 and the product height H corresponding area 11 after the forming. During the formation, the film area 30 (FIG. FIG. 1 ) via the second lower shaping edge 9 and the second upper shaping edge 13. H denotes the product height and B denotes the width of the film. The angle α indicates the measure of the offset of the upper forming shoulder 7 with respect to the lower forming shoulder 6.

The upper forming shoulder tip 21 may additionally be shaped downwardly and / or rounded for guiding the film web running over the tip for certain packaging materials.

Claims (6)

Tube forming device (1) for a horizontal packaging machine for longitudinally folding an endless film web (18) into a film half-tube (3) having an upper forming shoulder (7) and a lower forming shoulder (6), the upper and lower forming edges (8, 9, 12, 13),
characterized in that
the lower forming shoulder (6) has a first lower forming edge (8) and a second lower forming edge (9) angled towards the first lower forming edge (8) by 45 ° therefrom, which together form a lower forming shoulder tip (20), and
the upper forming shoulder (7) arranged parallel to the lower forming shoulder (6) has a first upper forming edge (12) and a second upper forming edge (13) arranged at an angle of 90 ° to each other and forming an upper forming shoulder tip (21), having,
wherein the second upper forming edge (13) is parallel to the second lower forming edge (9) and the upper forming shoulder tip (21) is recessed from the lower forming shoulder tip (20) by an angle α. Tube forming device according to claim 1, characterized in that the angle α is 67.5 °. Tubular shaping device according to one of the preceding claims, characterized in that the upper forming shoulder (7) can be moved parallel to the height at an angle with the upper forming shoulder tip (21) at the angle α. Method for forming a film half-tube (3) with a lower film (5) formed along a folding edge and a top film (4) from a moving endless film web (18) by means of a tube forming device (1) having an upper forming shoulder (7) and a lower forming shoulder ( 6) with upper and lower mold edges (7, 8, 12, 13), characterized in that
moves the film web (18) counter to the direction of movement (2) of the finished film half-tube (3) below the lower forming shoulder (6),
for forming the lower film (5), a part of the film web (18) is deflected by 180 ° at a first lower shaping edge (8) of the lower forming shoulder (6) arranged perpendicular to the movement direction,
to form the upper film (4) the other part of the film web (18) at a arranged at an angle of 45 ° to the first lower mold edge (8) second lower mold edge (9) and arranged parallel to the second lower mold edge (9) second upper forming edge (13) of the upper forming shoulder (7) deflected by e180 ° and then the over the upper forming shoulder (7) running part of the second longitudinal part at a at an angle of 90 ° to the second upper forming edge (13) arranged first upper Form edge (12) at an angle of 45 ° as the top film (4) in the direction of movement (2) of the film half tube (3) is deflected. A method according to claim 4, characterized in that the distance of the forming shoulders (6, 7) to each other depending on the height of the packaged goods is varied. A method according to claim 5 or 6, characterized in that the forming shoulders (6, 7) at an angle of 67.5 °, preferably only the upper forming shoulder (7) are moved in parallel.

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