DE102017131026A1 - Improved cross-cut welder, foil wrapping machine and process - Google Patents

Abstract

The present invention relates to a cross-cut welding device (22) for a film packaging machine (10), comprising an upper punch (44) and a lower punch (46), wherein the upper punch (44) has a transverse welding surface (84) facing the lower punch (46), wherein the Upper punch (44) at least one heating device (88) for heating the transverse welding surface (84), wherein in the transverse welding surface (84) of the upper punch (44) has a groove (86) is formed, wherein the lower punch (46) two from each other through a gap (89) spaced pressure receiving means (66, 67), wherein the pressure receiving means (66, 67) forming a the upper punch (44) facing support surface (70), wherein the upper punch (44) and the lower punch (46) in a separation welding plane (57 ) are movable relative to each other, wherein the gap (89) opposite to the groove (86) of the upper punch (44) is arranged, wherein the lower punch (46) arranged in the gap (89) Tre and each of the pressure receiving means (66, 67) in the lower punch (46) parallel to the separating welding plane (57) movable, in particular resilient, is mounted. Furthermore, a film packaging machine and a method are proposed.

Description

The present invention relates to a cross-cutting device for a film packaging machine, with an upper punch and a lower punch, wherein the upper punch has a transverse welding surface facing the lower punch, wherein the upper punch has at least one heating device for heating the transverse welding surface.

Such a lower punch is for example from the document DE 10 2011 015 111 A1 known.

Packaging machines are used in many industrial applications for packaging different packaged goods. The packaged goods can be consumer goods such as data media, books or conventional products sold in supermarkets, but also special items such as spare parts or building materials such as clay. Even in magazines with supplements or in the field of mail order, packaging machines are used regularly.

The present invention is primarily concerned with film packaging machines, in which a distinction is made between form shoulder machines, series packing machines and banding machines. While form shoulder machines and series packing machines are intended to wrap a packaged goods completely in foil, only a band is placed around a packaged product to be packaged by means of a banding machine.

In the context of the present invention, "packaging machine" is therefore to be understood as meaning all of the aforementioned types of packaging machines. The term "outer packaging" means both the packaged goods completely enveloping film packaging, which can be supplied as a half tubes and on the other hand in the form of separate films, as well as bands.

Common to all packaging machines is that the outer packaging must be welded and separated on at least one side. For banding this is usually the case only on one side of the case, with form shoulder machines on two or three sides and in series packing machines on all four sides of the packaged goods. Therefore, packaging machines always have a so-called cross-cutting device, which welds the outer packaging transversely to the transport direction of the packaged product in the packaging machine and at least partially severed. Furthermore, packaging machines have longitudinal welding devices or longitudinal separation welding devices which weld the outer packaging parallel to the transport direction of the packaged goods and separate any film overhang that may be present. The film supernatant is then usually collected by means of a film return and recycled.

Packaging machines are rarely made for a specific packaged product. Usually, packaging machines should be able to handle packaged goods of different dimensions. The packaged goods differ on the one hand in their width and on the other in their height. Accordingly, it has been proposed to make the longitudinal welding device of the packaging machine adjustable in order to adapt the packaging machine to different packaged goods can.

Furthermore, film webs of different thicknesses, colors and folds are possible because the outer packaging can vary from packaged goods to packaged goods. The film material can also be different from packaged goods to packaged goods.

The cycle rate at which the packaged goods enter and are to be packaged in the film packaging machine can also vary. In this case, it is basically the case that a higher cycle rate causes a higher feed rate of the packaged goods, so that the residence time of a film section in a fixed cross-divisional welding device decreases. An upper punch and a lower punch of the cross-cutting device remain for a shorter period of time for separating welding. In addition to the residence time of the cross-cutting welding dies on the film, the pressure applied to the film by means of the cross-cutting welding device and the temperature of the heated upper die also play a role in the question of whether a high-quality separating weld seam can be produced over the entire film thickness.

In known cross-cutting devices, a thermal separation process is performed. That By means of a heated upper punch and / or a heated lower punch, the film webs are thermally separated and thereby fused or welded together. However, the temperature required to separate the film web is higher than the temperature required for the mere welding of the film web. As a result, as a rule, the film webs were subjected to a temperature which was too high for the insulated welding process.

It can not only lead to poor welding results, as the film webs, for example, vaporize in places, this can also lead to unwanted behavior of other materials involved.

For example, in the case of very thick films, films which are provided with an adhesive tape or with a relatively thick application of paint or a large number of colors provided films, a high temperature must be selected for thermal cutting. Adhesive tapes or adhesives or paints then melt under these temperatures and can lead to unclean welds. Also a contamination of the Trennschweißstempel can occur. Contamination can in turn lead to unwanted welding results over the service life.

It is an object of the present invention to overcome the foregoing problems and provide a means for high quality cross-cut welding of film webs, particularly thick, multilayer and colored film webs.

According to a first aspect, therefore, a cross-cutting device is provided for a film packaging machine with an upper punch and a lower punch, wherein the upper punch has a transverse welding surface facing the lower punch, wherein the upper punch has at least one heating device for heating the transverse welding surface, wherein a groove in the transverse welding surface of the upper punch wherein the lower punch has two pressure-receiving devices spaced apart from each other by a gap, the pressure-receiving devices forming a support surface facing the upper punch, wherein the upper punch and the lower punch are movable relative to one another in a separating welding plane, the gap being arranged opposite the groove of the upper punch wherein the lower punch has a separating knife disposed in the gap and wherein each of the pressure receiving means in the lower punch is parallel to the separating welding plane wegbar, in particular resilient, is stored.

According to a further aspect, a cross-cutting device is provided for a film packaging machine, comprising a first punch and a second punch, wherein the first punch has a transverse welding surface facing the second punch, the first punch having at least one heating device for heating the transverse welding surface, characterized in that a groove is formed in the transverse welding surface of the first punch, the second punch having two pressure receiving means spaced apart from each other by a gap, the pressure receiving means forming a support surface facing the first punch, the first punch and the second punch being movable relative to each other in a separating welding plane wherein the gap is disposed opposite the groove of the first punch, the second punch having a separating knife disposed in the gap, and wherein each of the pressure receiving means in the second Iten stamp parallel to the separation welding plane movable, in particular resilient, is mounted.

In this case, the first punch may be the upper punch or the lower punch and the second punch the other of the upper punch and the lower punch. Preferably, however, the first punch of the upper punch and the second punch of the lower punch.

In this way, a cross-cutting device is formed in which, as before, a thermal welding of the film webs takes place, but a mechanical separation of the film webs takes place. Due to the resilient mounting of the pressure-receiving devices, the pressure-receiving devices can be pressed against their spring force by means of the upper punch. The cutting knife is firmly stored in the lower die. The separating knife is not movable in the lower punch. The pressure-receiving devices thus move relative to the separating blade upon application of force against the spring force of their resilient mounting in the separation welding plane. The separating knife thus emerges from the gap and into the opposite groove of the upper punch. The foil webs held between the transverse welding surface and the support surface formed by the pressure-receiving device are pressed onto the separating knife, as it were, and severed therefrom. The severing can take place over the entire width of the film webs, or else it can stand outside on at least one side of a continuous strip, which is used for promotion by the longitudinal welding device and only separated in the longitudinal welding device.

Furthermore, increased safety for both the packaged goods and the operating person of the present packaging machine is provided by the separating knife arranged in the lower punch. The spark plug is placed in the nip in the gap between the pressure receiving means and is released only upon application of force by the punch, where it directly engages the groove of the punch opposite the gap. Access to the cutting surface of the exposed cutting blade is thus neither for the packaged goods nor for an operator in the plant in an operating condition possible.

Furthermore, according to another aspect of the invention, a Foil packaging machine may be provided with such a cross-cutting device.

According to yet another aspect of the invention, there is provided a method of cross-cutting weld film web sections comprising the steps of moving a heated crossweld surface of a top die of a cross-cut welder relative to a support surface of a lower die of the cross-cut welder such that the cross weld surface abuts the support surface and welding the cross-weld Film web sections between the transverse welding surface and the support surface takes place; and depressing the support surface by means of the upper punch, so that a separating knife emerges from a gap in the support surface and enters a groove formed in transverse welding surface, so that the film web sections are severed by the cutting knife, in particular wherein the depression is against a spring force.

According to yet another aspect of the invention, there is provided a method of cross-cutting welding film web sections, comprising the steps of moving a heated crossweld surface of a first die of a cross-cut welder relative to a support surface of a second die of the cross-cut welder so that the crossweld surface abuts the support surface and welding Film web sections between the transverse welding surface and the support surface takes place; and depressing the support surface by means of the first punch, so that a separating knife emerges from a gap in the support surface and enters a groove formed in the transverse welding surface, so that the film web sections are severed by the cutting knife, in particular wherein the depression is against a spring force.

In this case, the first punch may be the upper punch or the lower punch and the second punch the other of the upper punch and the lower punch. Preferably, however, the first punch of the upper punch and the second punch of the lower punch.

Also, by means of the proposed method is thus initially a clamping or holding the film web sections, which may be both film sections of a separate top film and a separate bottom film in a film packaging machine according to the original packaging principle, but also to two superimposed film web sections of a C-shaped wrapped foil in a form shoulder machine. While the transverse welding surface of the upper punch rests on the support surface of the lower punch, the lower punch is depressed by the upper punch and the cutting knife emerges from the support surface and into the groove of the transverse welding surface of the upper punch, whereby the film web sections are mechanically severed.

The object initially posed is therefore completely solved.

In one embodiment, the first punch may be the upper punch and the second punch the lower punch. When reference is made below to the further embodiments to the "upper punch" and the "lower punch", the embodiments may also be provided without specific assignment to upper punch and lower punch, wherein the term "upper punch" by the term "first punch" and the Term "lower punch" is replaced by the term "second punch".

In one embodiment it can be provided that the upper punch and the lower punch are movable relative to one another in the separating welding plane in such a way that the transverse welding surface of the upper punch and the supporting surface formed by the pressure receiving means abut each other.

The separation welding plane thus denotes a plane which is formed by the longitudinal extension of the upper punch and lower punch in the horizontal direction and by the vertical movement of at least one of the upper punch and the lower punch relative to each other.

In a further embodiment it can be provided that the pressure receiving devices are resiliently mounted in the lower die in the separation welding plane, that the separating knife is arranged retracted in the support surface, when the support surface and the transverse welding surface are spaced apart, and that the separating knife protrudes from the support surface and protrudes into the groove when the transverse welding surface acts on a sealing force on the support surface. Instead of "sealing power", only the term "force" can be used. This designates a force which is large enough, contrary to the spring force of the bearing of the pressure-receiving devices, to push the pressure-receiving devices downwards, so that the separating knife can protrude.

In this way it is ensured that without force application, ie when the support surface and the transverse welding surface are spaced apart, the cutting knife is arranged in the gap between the pressure receiving devices. An operator can thus, for example, not reach into the separating knife with his hand. Even a packaged item can not be damaged by the cutting knife. Only when supporting surfaces and cross welding surface abut each other and then the Querschweißfläche further applied a force on the support surface and presses the pressure receiving device down, the separating knife protrudes from the support surface and directly into the groove formed in the transverse welding surface of the upper punch. The mechanical separation process of the film web thus takes place only if and only if there is already a clamping of the film web between transverse welding surface and the support surface. In this state, neither a person nor an object can reach the separating knife from the outside.

In a further embodiment of the cross-cutting welding device, it may be provided that the upper punch has two hold-down elements which are arranged on opposite sides of the separating welding plane or the transverse welding surface and are mounted movable in the upper punch parallel to the separating welding plane relative to the transverse welding surface, the holding-down elements respectively lying opposite one another are arranged to one of the pressure receiving devices.

By means of these hold-down elements, it is possible to provide a first fixation of the film web sections between the hold-down elements and the pressure-receiving devices before the transverse welding surface then approaches the pressure-receiving devices and the support surface. In this way, it is all the more ensured that the welding process is also shielded as such, before the transverse welding surface and supporting surface come into contact with each other. Furthermore, the film web sections are tensioned and fixed on the support surface before the transverse welding surface strikes.

In a further embodiment it can be provided that the hold-down elements are mounted parallel to the separation welding plane so resiliently in the upper punch that a lower end of each hold-down element facing each lower holding element is spaced less from the support surface than the transverse welding surface, when the support surface and the transverse welding surface are spaced apart ,

The hold-down elements are thus resiliently mounted in such a way that they project downwards, as it were, beyond the transverse welding surface and thus impinge first on the pressure-receiving devices. In each case, a hold-down element is arranged on each side of the separation welding plane, so that each pressure-receiving device is thus associated with a hold-down element. A hold-down element is thus arranged in the transport direction in front of the separation welding plane and a hold-down element is arranged in the transport direction behind the separation welding plane.

In a further embodiment, it can be provided that a spring constant of a resilient mounting of the hold-down elements is less than a spring constant of each resilient mounting of one of the pressure-receiving devices.

In other words, the force required to depress the pressure-receiving devices is greater than the force required to push up or compress the hold-down elements. In this way, hold-down elements are initially compressed on impact with the pressure-receiving devices when holding down or the transverse welding surface moves relative to the resting on the pressure receiving device retaining elements down until the transverse welding surface comes to rest on the support surface. Only then a force is applied to the pressure-receiving devices by means of the upper punch, which springs down against the spring force of their resilient mounting.

In a further embodiment it can be provided that the transverse welding surface and / or the support surface has at least one recess running perpendicular to the separation welding plane.

The corresponding recess thus runs parallel to the transport direction. In this way, no complete welding is generated over the entire width, but generates a number of recesses corresponding number of holes in the weld. In this way, a venting of the welded foil bag is possible, so that their volume can be minimized. The provision of such ventilation holes in the separating weld is possible because it no longer requires a thermal separation process, but the separation process takes place mechanically, so that recesses can be provided in the weld. It then eliminates the need to punch in the course of the film packaging machine, the foil bag.

In a further embodiment, it may be provided that an elastic element is arranged in the groove of the upper punch at a base of the groove.

Since the groove faces downwardly, the bottom of the groove in the operating position of the film wrapping machine and the cross-cutting welding device is oriented upward, so that the elastic element is arranged quasi top in the groove. At the elastic element, the cutting knife then comes to a stop or something enters this. In this way, a striking of the cutting blade on the groove bottom and any damage can be avoided.

In one embodiment it can be provided that the elastic element is made of silicone.

This has proved to be particularly advantageous because the cutting blade can enter something in silicone. In particular, color residue contamination of the cutting blade can be pressed into the silicone and stripped there. To maintain the system, it is then only necessary to replace the silicone element at certain intervals if necessary. The cutting knife remains in this way relatively free of paint particles and dirt.

In a further embodiment it can be provided that a resilient mounting of each of the pressure-receiving devices is designed such that at a maximum deflection of the pressure-receiving devices, the separating blade rests against the elastic element or immersed in the elastic element.

In this way, the distances are formed such that at full depression of the pressure receiving means and maximum immersion of the separating knife in the groove of the upper punch, the cutting edge or a toothing of the cutting blade just rests against the elastic element or the silicone element or something dips into this. In this way, as described above, a particularly good cleaning effect of the knife is achieved.

In one embodiment, it may be provided that the lower punch is designed to be stationary, wherein the upper punch is designed to be movable in the separating welding plane.

In this way, a simple structure with good welding result can be provided.

In a further embodiment, it may alternatively also be provided that the upper punch and the lower punch are designed to be movable in the separation welding plane.

In this way, the point of coincidence of the upper punch and the lower punch can be varied with good welding result.

In one embodiment it can be provided that the separating knife is arranged fixed in the lower punch.

In this way, the structure can be further simplified. The separating knife is thus fixedly arranged, in particular in a fixed lower punch. Only the depression of the pressure-receiving device by means of the upper punch releases the separating knife and causes the mechanical severing of the film webs, which are pressed over the fixed separating knife.

In one embodiment of the method it can be provided that, prior to the step of relative movement, two hold-down elements movable on the upper punch relative to the transverse welding surface are brought into abutment with the pressure-receiving devices of the lower punch forming the support surface and spaced apart by the gap, so that the film web portion between the hold-down elements and the pressure receiving means are held, and subsequently, during the relative moving step, the transverse welding surface is moved onto the support surface relative to the hold down members already in contact with the pressure receiving means.

In this way, as described above, initially hold down the superimposed film webs, which fixes the film webs and tensioned. Only then does the crosswelding surface of the upper punch strike the support surface by moving relative to the hold-down elements already in abutment. After the transverse welding surface comes into abutment with the support surface, then the depression of the support surface and the pressure receiving devices against their spring force of their storage, so that the cutting blade emerges through the support surface and cuts through the superimposed film webs.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

• 1 eine schematische Ansicht einer Folienverpackungsmaschine,
• 2 eine lediglich beispielhafte Darstellung des Abschnitts II in der 1,
• 3 einen Querschnitt entlang einer Linie III-III in 2, die schematisch einen erfindungsgemäßen Unterstempel zeigt,
• 4a eine Querschnittsansicht entlang einer Linie IV-IV in 3,
• 4b bis 4d verschiedene Stadien des Quertrennschweißvorgangs;
• 5 eine schematische Ansicht eines Trennmessers; und
• 6 ein schematisches Ablaufdiagramm eines Verfahrens.

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. Show it:

• 1 a schematic view of a film packaging machine,
• 2 a merely exemplary representation of Section II in the 1 .
• 3 a cross section along a line III-III in 2 showing schematically a lower punch according to the invention,
• 4a a cross-sectional view along a line IV-IV in 3 .
• 4b to 4d various stages of cross-cutting welding process;
• 5 a schematic view of a separating knife; and
• 6 a schematic flow diagram of a method.

1 shows a film packaging machine 10 in a schematic view. The packaging machine 10 serves as a packaged good 12 to be provided with an outer packaging. For this, the packaged goods 12 in a transporting direction T through the film wrapping machine 10 emotional.

The packaged goods 12 is from the film wrapping machine 10 with a foil web 14 coming from a slide feeder 15 is wound up, shrouded. If it is a series packing machine, another film web can 16 that from another slide feeder 17 is handled, be provided. This type of wrapping then corresponds to the principle of a so-called series packing machine, so that accordingly the present invention using the example of a designed as a series packing machine film packaging machine 10 is explained.

The upper foil web 14 and the lower foil web 16 run in a film plane 18 together. The packaged goods 12 thus moves into the converging upper film web 14 and lower film web 16 a, wherein the film webs 14 . 16 initially undergo a cross-tightening.

This is a cross-straightening device 20 intended. The wrapped goods 12 with the transversely straightened foil webs 14 . 16 reaches a cross-cutting device 22 , The cross-cutting device 22 welds the foil webs 14 . 16 transverse to the transport direction T together and cuts through the film webs 14 . 16 at least partially, so that the packaged goods 12 along the weld no longer in contact with the preceding packaged goods 12 Has.

Subsequently, the packaged goods are transported 12 by a longitudinal separation welding device 24 , which is intended to the film webs 14 . 16 at the side of the packaged goods 12 weld together and separate a side film overhang. Finally, the opposite to the transport direction T facing side of the packaged goods 12 again from the cross-cutting device 22 welded and separated. The packaged goods 12 is now welded and trimmed on all four sides so that the packaged goods 12 is completely surrounded by a film wrapping.

The sequence of cross-cutting device 22 , the longitudinal part welding device 24 and the cross-straightening device 20 is merely exemplified in a frequently occurring configuration. The sequence of these devices may also be different, for example, can be provided, the cross-cutting device 22 after the longitudinal separation welding device 24 to arrange. Also, elements of the cross straightening device 20 between or in the cross-cutting device 22 or the longitudinal separation welding device 24 be provided.

It can be provided that then at least one further module connects, for example, a shrink tunnel 26 which is heated to a certain temperature and the film webs 14 . 16 on the packaged goods 12 shrinks, leaving the film webs 14 . 16 the packaged goods 12 enclose firmly and without play. Furthermore, for example, a Abschweißstation be provided, the one after passing through the longitudinal separation welding device 24 still existing film overhang closely adjoining the packaged in the longitudinal direction. This can be especially true for packaged goods 12 be provided with varying width. The packaging process is then completed.

The presence of a shrink tunnel 26 basically depends on the requirements of the packaging. A shrink tunnel 26 does not necessarily have to be present especially for series packing machines.

Furthermore, the film packaging machine 10 usually adjusting devices 28 on to the foil wrapping machine 10 be able to adjust to packaged goods of different width, length and height. The speed of the packaging process can also be adjusted by means of the adjusting devices 28 be set. Furthermore, possibilities are provided, the film packaging machine 10 on different types of film, which may differ, for example, in thickness, tear resistance and surface finish from each other to adjust.

Ultimately, a film return is usually 30 provided by the longitudinal separation welding device 24 collected excess excess film material to supply it, for example, a recycling process.

With II is a section of the foil wrapping machine 10 designated in 2 is shown in a detailed view.

The in the 2 shown detail view shows the transverse tensioning device 20 , the cross-cutting welding device 22 and the longitudinal separation welding device 24 ,

The transverse tensioning device 20 usually has an upper transverse tension wheel 32 and a lower transverse tension wheel 34 on top of the top film web 14 and the lower foil web 16 between them and in a transverse direction, ie perpendicular to the transport direction T tighten. It is usually provided that the transverse tension wheels 32 . 34 are slightly inclined with their axis of rotation to the outside.

A first transport device 36 conveys the packaged goods to be packaged at the film level 18 up to the cross-cutting device 22 , There ends the first transport device 36 in a first pulley 38 , To the first transport device 36 closes a second transport device 40 on, which the packaged goods 12 from the cross-cutting device 22 to the longitudinal separation welding device 24 promotes. The longitudinal separating welding device 24 and the transition from the second conveyor 40 to the longitudinal separation welding device 24 are shown only schematically and can be configured as desired.

The second transport device 40 starts with a second pulley 42 that are very close to the first pulley 38 moved up in a first position. This first position is in the 2 and is intended to denote that position in which one between the first guide roller 38 and the second pulley 42 existing punch gap is minimized.

The cross-cutting device 22 has a first punch, in the embodiment shown, the upper punch 44 , and a second punch, in the embodiment shown, the lower punch 46 , on. In the following, we therefore speak directly from the upper punch and the lower punch. The upper stamp 44 and the lower stamp 46 are movable toward each other to the upper foil web 14 and the lower foil web 16 at least partially cut and welded.

In the in 2 However, this is not possible because the punch gap is closed. The upper stamp 44 and the lower stamp 46 can not meet because the second pulley 42 located between them.

Therefore, the second transport device 40 in the horizontal direction, ie parallel to the film plane 18 , movable. This movement is by an arrow 48 clarified.

The lower stamp 46 in turn moves along one with an arrow 49 clarified direction. In an operating state of the film packaging machine 10 the direction runs 48 horizontal and the direction 49 vertical. The direction 48 extends in accordance with the terminology used in the present description in the direction of a "length" of the film packaging machine 10 or one of their elements. The direction 49 accordingly designates a "height". Perpendicular to the direction 48 and the direction 49 Consequently, a "width" of the film packaging machine extends 10 or the lower punch 46 ,

To effect the movements is a drive device 50 intended. The drive device 50 is in 2 only shown schematically. It may be any device, preferably a servomotor or other suitable electric motor is provided to effect the movements.

This drives the drive device 50 a two-sided lever or double lever 52 on the one hand, a first lever 54 which is at the lower stamp 46 is hinged and on the other a second lever 56 which is on the upper punch 44 is articulated. In this way, by means of a by the drive device 50 effected rotation of the double lever 52 both a movement of the lower punch in one direction 49 upwards as well as a movement of the upper punch 44 in one direction 49 be effected down.

3 shows a schematic cross-sectional view along the one separation welding plane 57 performing line III-III in 2 ,

Shown is a lower stamp 46 , The lower stamp 46 can be heated, but this is not mandatory. The upper stamp 44 is heated in the illustrated embodiment. For this purpose, the film packaging machine 10 a heating control device 58 for the upper stamp 44 on. For the lower stamp 46 may be a heating control device 60 be provided when this is also heated. That two separate heating control devices 58 . 60 are provided, is not absolutely necessary, if necessary, a single heating control device for both the upper punch 44 as well as the lower stamp 46 be provided. The heating control device 58 is over a line 62 with the upper stamp 44 connected. The heating control device 60 is over a line 63 with the lower stamp 46 connected. By means of the wires 62 . 63 can both in a respective heating device (in the 3 not shown) to be introduced power as well as a measurement signal one in the upper punch 44 or the lower stamp 46 arranged temperature sensor (in the 3 not shown). Are two separate heating control devices 58 . 60 provided, they can by means of a line 64 be connected to the data exchange to the heating of the upper punch 44 and the lower punch 46 to regulate or synchronize together.

The lower stamp 46 has a pressure receiving device 66 on, which is formed of a suitable material, such as a heat-resistant plastic material, such as silicone, or of a rubber material. The pressure receiving device 66 is from a support device 68 supported. Furthermore, the lower stamp 46 a strip member having the pressure receiving means 66 on the support device 68 supported laterally in the transport direction. However, the strip element is not necessarily provided in a fixed cross-cutting device 22 For example, it may also be omitted.

The lower stamp 46 extends along a longitudinal axis 72 , The longitudinal axis 72 of the lower punch 46 thus runs transversely to the transport direction T ,

The upper stamp 44 has a heated element 82 on, the transversely to a separation welding plane at least one of the in 3 illustrated two recesses 61 . 61 ' having. In this way, air holes can be formed in the weld.

The 4 shows a schematic cross-sectional view along a line IV-IV in 3 ,

4a shows a cross-sectional view of the cross-cutting device 22 along the line IV-IV in the 3 , Shown are the upper cancel 44 and the lower stamp 66 , The lower stamp 46 has two pressure receiving devices 66 and 67 on. These pressure receiving devices 66 and 67 For example, they may be formed of a hard plastic material that is heat resistant. The the upper stamp 44 facing surfaces of the pressure receiving devices 66 . 67 form the support surface 70 out. Each of the pressure receiving devices 66 . 67 is in a support element 72 or. 73 arranged. Between them, the pressure receiving devices 66 . 67 a gap 89 on. On the opposite side may be groin sections 74 or. 75 be arranged to prevent slippage of the pressure-receiving devices 66 . 67 to prevent. However, these are not absolutely necessary. For example, the pressure receiving devices 66 . 67 with the support elements 72 . 73 be glued. The support elements 72 . 73 are of spring receiving elements 78 or. 89 spaced and by means of one of the respective springs 80 . 81 stored in these resilient. Between the pressure receiving devices 66 . 67 , the support elements 72 . 73 and the spring shots 78 . 79 extends the separating knife 90 , In this way it becomes the pressure receiving device 66 . 67 springy in the lower punch 46 stored and is parallel to the separation welding plane 57 or in the vertical direction against the spring force of the spring elements 80 movable and guided in the vertical direction.

The upper stamp 44 has a heated element 82 on which the lower stamp 46 facing surfaces a transverse welding surface 84 form. In the transverse welding surface 84 is a groove 86 formed, extending in a vertical upward direction, ie away from the lower punch 46 extends. At a bottom of the groove, ie at the lower stamp 46 spaced end of the groove is an elastic element 87 arranged, which may be formed of silicone. In the heated element 82 is a heating element 88 , For example, a heating cartridge or a heating coil arranged, which is the heated element 82 heated to the welding temperature.

Furthermore, the upper stamp 44 Retaining elements 94 and 96 on that on both sides of the heated element 82 or the transverse welding surface 84 are arranged. In the illustrated cross-sectional view is thus the hold-down element 94 in the transport direction in front of the heated element 82 arranged and the hold-down element 96 in the transport direction behind the heated element 82 , The hold-down elements are to their the lower stamp 46 facing ends 75 or. 97 slightly bent over each other. Down member 94 . 96 are springy in the upper punch 94 by means of a spring storage 88 stored. In this way, the hold-down elements 94 . 96 parallel to the separation welding plane 97 relative to the heated element 82 and the transverse welding surface 84 move.

The sequence of the cross-separation welding process is successively in the following 4b to 4d explained.

From the in the 4a The starting position shown becomes the upper punch 44 on the fixed lower punch 46 emotional. Here are first hold down elements 94 and 96 with her the lower stamp 46 facing ends 95 and 97 to rest on the pressure receiving devices 66 . 67 , This situation is in the 4b shown.

Between the upper punch and the lower punch continuous film web sections are now between the hold-down elements 94 . 96 and the pressure receiving devices 66 . 67 held and excited.

Now the upper punch is moved to the lower punch. The already on the pressure receiving devices 66 . 67 Overlying hold-down elements are now in the resilient storage 98 inserted and move relative to the other elements of the upper punch 44 , This movement will continue until the heated element 82 with the transverse welding surface 84 to the plant on the Pressure recording devices 66 . 67 and the support surface 70 comes. The situation is with 4c shown. Now begins the sealing process and the film web sections are between the pressure receiving devices 66 . 67 and the heated element 82 welded. The situation is in the 4c shown.

The upper punch is now moved further down and presses the pressure receiving device 66 . 67 against the force of the springs 80 . 81 further down. In doing so, the separating knife enters 90 from the gap 89 out and into the groove 86 on. In the fully compressed state, which in the 4d is shown, the support elements are 72 . 73 on the spring mounts 88 . 89 on. The cutting knife 90 dives minimally into the silicone element with its tips 87 on. The film web sections are in this way mechanically by means of the separating knife 90 severed. The film webs are thus mechanically severed and at the same time thermally sealed or welded together. In the event that the recesses 61 or. 61 ' are provided, are also available in the welds openings for venting the foil bag. Nevertheless, a separation can take place over the full width due to the effect of the mechanical separation by the separating knife 90 ,

Subsequently, the stamps are opened again, ie the upper punch 44 moved up in the in the 4a illustrated state.

The 5 shows only schematically a possible cutting knife 90 , With 91 designated cutting edge is formed, for example, jagged as shown. In particular, two mutually offset teeth rows can be provided. It is thus not absolutely necessary that the cutting edge of the cutting knife runs straight, but by means of the illustrated serrated edge 91 a good mechanical separation can take place. Furthermore, the prongs can 91 in the silicone element 97 immerse with their tips and so on the flanks of the teeth arranged dirt or color in the silicone are stripped off. In this way, clogging of the stamp elements or the welding knife can be avoided and only the silicone element can be exchanged during maintenance.

The 6 shows a schematic flow diagram of a method according to the invention.

This procedure follows in the 4a to 4d shown procedure. After the start of the procedure, a, but optional, step 106 take place by first, before the step of relatively moving the upper punch relative to the lower punch relative to the cross-sectional area movable hold-down elements with the support surface forming and spaced by the gap pressure receiving means of the lower punch are brought into abutment, so that the film web sections 14 . 16 between the hold-down elements and the pressure-receiving devices 66 . 67 being held. Subsequently, during the step of relative movement 102 the transverse welding surface is moved onto the support surface relative to the hold-down elements already resting against the pressure-receiving devices. The step of relative moving 1 or 2 brings the heated crossweld surface of the upper punch in contact with the support surface 70 of the lower punch 46 the cross-cutting device 22 , The transverse welding surface 84 is close to the support surface 70 on and welded to the film web sections 14 . 16 between the transverse welding surface 84 and the support surface 70 or the pressure receiving devices 66 . 67 ,

Ultimately, a step follows 104 depressing the support surface or the pressure receiving device 66 . 67 by means of the upper punch against a spring force of, in particular the spring elements 80 . 81 , The cutting knife 90 thus comes out of the gap 89 between the pressure receiving devices 66 . 67 out and into the groove 86 in the transverse welding surface 84 one, leaving the film web sections 14 . 16 from the cutter 90 be severed. The procedure then ends.

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• DE 102011015111 A1 [0002]

Claims (17)

A cross-cut welding device (22) for a film packaging machine (10), comprising an upper punch (44) and a lower punch (46), wherein the upper punch (44) has a transverse welding surface (84) facing the lower punch (46), the upper punch (44) at least a heating device (88) for heating the transverse welding surface (84), characterized in that a groove (86) is formed in the transverse welding surface (84) of the upper punch (44), the lower punch (46) being separated from one another by a gap (89 ) spaced pressure receiving means (66, 67), wherein the pressure receiving means (66, 67) forming a the upper punch (44) facing support surface (70), wherein the upper punch (44) and the lower punch (46) in a separation welding plane (57) relative the gap (89) opposite the groove (86) of the upper punch (44) is arranged, wherein the lower punch (46) arranged in the gap (89) separating knife (90) au fweist, and wherein each of the pressure receiving means (66, 67) in the lower punch (46) parallel to the separating welding plane (57) movable, in particular resilient, is mounted. Cross separation welding device (22) according to Claim 1 characterized in that the upper punch (44) and the lower punch (46) are movable relative to each other in the separating welding plane (57) such that the transverse welding surface (84) of the upper punch (44) and that formed by the pressure receiving means (66, 67) Support surface (70) abut each other. Cross separation welding device (22) according to Claim 1 or 2 characterized in that the pressure receiving means (66, 67) are resiliently mounted in the die (46) in the separation welding plane (57) such that the cutting knife (90) is retracted into the support surface (70) when the support surface (70 ) and the transverse welding surface (84) are spaced apart from each other and that the separating knife (90) protrudes from the support surface (70) and projects into the groove (86) when the transverse welding surface (84) applies a sealing force to the support surface (70) , Cross cutting device (22) according to one of Claims 1 to 3 characterized in that the upper punch (44) has two hold-down members disposed on opposite sides of the separating welding plane (57) and movably supported in the upper punch (44) parallel to the separating welding plane (57) relative to the transverse welding surface (84); wherein the hold-down members (94, 96) are respectively disposed opposite to one of the pressure receiving means (66, 67). Cross separation welding device (22) according to Claim 4 , characterized in that the hold-down elements parallel to the separation welding plane (57) are resiliently mounted in the upper punch (44) such that an end of each hold-down element facing the lower punch (46) is spaced less from the support surface (70) than the transverse welding surface (84 ), when the support surface (70) and the transverse welding surface (84) are spaced from each other. Cross separation welding device (22) according to Claim 5 , characterized in that a spring constant of a resilient mounting of the hold-down elements is less than a spring constant of each resilient mounting of one of the pressure receiving means (66, 67). Cross cutting device (22) according to one of Claims 1 to 6 , characterized in that the transverse welding surface (84) and / or the supporting surface (70) has at least one recess running perpendicular to the separating welding plane (57). Cross cutting device (22) according to one of Claims 1 to 7 , characterized in that in the groove (86) of the upper punch (44) at an end of the groove (86) an elastic element is arranged. Cross separation welding device (22) according to Claim 8 , characterized in that the elastic element is formed of silicone. Cross separation welding device (22) according to Claim 8 or 9 , characterized in that a resilient mounting of each of the pressure receiving means (66, 67) is formed such that at a maximum deflection of the pressure receiving means (66, 67) the separating knife (90) rests against the elastic element or immersed in the elastic element. Cross cutting device (22) according to one of Claims 1 to 10 , characterized in that the lower punch (46) is stationary, wherein the upper punch (44) in the separating welding plane (57) is designed to be movable. Cross cutting device (22) according to one of Claims 1 to 11 , characterized in that the separating knife (90) is fixedly arranged in the lower punch (46). Film wrapping machine (10), with a cross-cutting device (22) according to one of Claims 1 to 12 , Method (100) for cross-cutting welding of film web sections (14, 16), comprising the following steps: Relatively moving (102) a heated transverse weld surface (84) of a top punch (44) of a cross-cut welding device (22) to a support surface (70) of a bottom punch ( 46) of the cross-cut welding device (22) so that the transverse welding surface (84) bears against the support surface (70) and the film web sections (14, 16) are welded between the transverse welding surface (84) and the support surface (70); and depressing (104) the support surface (70) by means of the upper punch (44) so that a separating knife (90) protrudes from a gap (89) in the support surface (70) and into a groove formed in the transverse welding surface (84). 86) occurs, so that the film web sections (14, 16) are severed by the separating knife (90), in particular wherein the depression takes place counter to a spring force. Method according to Claim 14 characterized in that prior to the step of relatively moving, two holddown members (94, 96) movable on the top punch (44) relative to the cross weld surface (84) form pressure receiving means (66) forming the support surface (70) and spaced apart by the gap (89) , 67) of the lower punch (46), so that the film web portions (14, 16) are held between the hold down members (94, 96) and the pressure receiving means (66, 67), subsequently during the relative moving step Transverse welding surface (84) is moved relative to the already on the pressure receiving means (66, 67) down holding elements (94, 96) on the support surface (70). A cross cut welding device (22) for a film wrapping machine (10), comprising a first punch (44) and a second punch (46), the first punch (44) having a transverse welding surface (84) facing the second punch (46), the first one Stamp (44) at least one heating device (88) for heating the transverse welding surface (84), characterized in that in the transverse welding surface (84) of the first punch (44) has a groove (86) is formed, wherein the second punch (46) two pressure receiving means (66, 67) spaced from each other by a gap (89), the pressure receiving means (66, 67) forming a support surface (70) facing the first punch (44), the first punch (44) and the second punch (46) are movable relative to one another in a separating welding plane (57), wherein the gap (89) is arranged opposite the groove (86) of the first punch (44), wherein the second punch (46) engages in the gap (89) arranged separating knife (90), and wherein each of the pressure receiving means (66, 67) in the second punch (46) parallel to the separating welding plane (57) movable, in particular resilient, is mounted. Method (100) for cross-cutting welding of film web sections (14, 16), comprising the following steps: Relatively moving (102) a heated transverse welding surface (84) of a first stamp (44) of a transverse cutting device (22) to a support surface (70) of a second stamp (46) of the transverse cutting device (22) so that the transverse welding surface (84) on the Support surface (70) is applied and a welding of the film web sections (14, 16) between the transverse welding surface (84) and the support surface (70) takes place; and Depressing (104) the support surface (70) by means of the first punch (44), so that a separating knife (90) protrudes from a gap (89) in the support surface (70) and into a groove formed in the transverse welding surface (84) 86) occurs, so that the film web sections (14, 16) are severed by the separating knife (90), in particular wherein the depression takes place counter to a spring force.

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