EP2426065A1 - Tubular bag packaging and method for manufacturing same - Google Patents

Abstract

The invention relates to a tubular bag packaging (1) for block-shaped foods, in particular for chocolate bars, a food product (24) with such a tubular bag packaging (1), and a method for producing such a tubular bag packaging (1). The tubular bag package (1) extends in a longitudinal direction (3) and in a transverse direction (4), and comprises a film with longitudinal edges (6, 7) running in the longitudinal direction (3), the film (5) being along its first Having longitudinal edge extending sealing portion (8) and an adjacent to its second longitudinal edge tab portion (37) with a further, along the second longitudinal edge extending seal portion (9). The film is closed in a tubular manner at the sealing portions (8, 9) to form a continuous seam (10) running in the longitudinal direction (3) and designed as a transfer seam. The tab portion (37) is provided in the region of its end edge (19) with at least one line-shaped separating incision (51) as a tear-open, wherein the separating incision (51) from the end edge (19) and at least approximately parallel to the longitudinal direction (3).

Description

The invention relates to a tubular bag packaging of the type specified in the preamble of claim 1, a food product with such a tubular bag packaging and a method for producing the tubular bag packaging.

For the packaging of block-shaped foods, in particular of chocolate bars so-called tubular bag packaging are used, which are formed from a film having longitudinal edges extending in the longitudinal direction. The film has a seal portion extending along its first longitudinal edge and a tab portion adjacent to its second longitudinal edge with another seal portion extending along the second longitudinal edge, the film at the seal portions forming a longitudinal, continuous and seamed seam is closed in a tubular manner around the block-shaped food. The transfer seam, including the tab portion and the seal portions, is folded along a fold line and laid flat on the back portion of the package. In addition, the tubular bag package is sealed at its transverse longitudinal edges in the longitudinal direction by transverse seams running in the transverse direction.

The rear seam, which is designed as a transfer seam, not only serves to form the tubular shape but is also provided by the user in the case of a corresponding configuration for the purposeful opening of the packaging. In particular, the aim is the tubular bag packaging to open at the back seam in a manner without tearing the film material uncontrollably. Remaining residual amounts of the contents of the package can thereby remain in the opened, open tubular bag packaging and stored.

However, opening the package on the back seam involves some difficulties. Although it is an embodiment of the tubular bag packaging known as a so-called "kink-pack" in which the still packed chocolate bar can be broken by a bending movement and then raises the back seam. However, this presupposes that the chocolate bar is sufficiently hard for such a targeted breaking process. At higher temperatures, the chocolate becomes so soft that buckling of the back seam is difficult or impossible. In addition, this kinking opening possibility is not always recognized by the user, which is why it tries to tear the packaging on the back seam. However, such tearing leads to the torn film tearing further uncontrolled. Further use of the opened packaging for storing residual amounts is therefore not possible or only to a limited extent.

The invention has the object of developing a generic tubular bag packaging such that a targeted opening is simplified.

This object is achieved by a tubular bag packaging with the features of claim 1.

The invention is also based on the object of specifying a food product with a tubular bag packaging, which is easier to handle for the user when opening.

This object is achieved by a food product having the features of claim 10.

The invention is still based on the object of specifying a method for producing said tubular bag packaging such that the tubular bag packaging produced with controlled crack propagation is easier to tear.

This object is achieved by a method having the features of claim 11.

According to the invention it is provided that the back seam has an end edge adjacent to the transverse seam, and wherein one of the tab portions is provided in the region of the end edge with at least one line-shaped parting incision as Einreißhilfe. The separating incision starts from the front edge and runs at least approximately parallel to the longitudinal direction of the tubular bag packaging or the film web intended for its formation.

The at least one separating cut is accordingly located on only one of the two tab sections, while the opposite tab section does not have such a separating cut. If the user wants to rupture the tubular bag packaging at the back seam, the film tears only at one provided with the separation cut tab portion, while the opposite tab portion does not tear. The generated tear continues only in this one tab section, while the other tab section remains undamaged. The result is a controlled cracking, remain in the essential sections of the tubular bag packaging undamaged. The opened tubular bag packaging can be used to store residual quantities of the packaging contents.

In an advantageous embodiment of the invention, in each case at least one separating incision is provided on two opposite end edges. In particular, several and in particular five separating cuts are provided on the front edge. Preferably, the separation cuts are arranged at a distance of about 1.5 mm from each other. Advantageously, the separation incision, starting from the end edge, has a length of 1.0 mm to 3.0 mm inclusive.

The arrangement of separating incisions on opposite end edges, the tubular bag packaging can be torn open from both sides, so that failed attempts are avoided. In addition, the opening of the tubular bag packaging is equally possible for right-handed as well as left-handed with preferred directions of movement. Due to the arrangement of several cutting incisions, it is not important that the tear force must be applied at a certain point when opening. Rather, the application of a tensile force in the region of the back seam or the tab sections extends in almost any direction, as a result of which the film of the tubular bag packaging tears at one of the several incisions. It has been found that a good compromise between the mechanical integrity of the tubular bag packaging and easier tearability is found by the aforementioned distance and length dimensions.

In a preferred embodiment, the film has a pressure conversion line in the region of the sealing section with the at least one line-shaped separating incision. The pressure conversion line preferably runs along the entire back seam. To generate the pressure conversion line pressure is exerted on the film such that a linear plastic cold deformation of the film occurs. The film is not completely severed by the press-forming line, but only deformed in its cross-section to maintain its structural integrity during ordinary handling. However, as soon as the user attempts to rupture the tubular bag packaging at the back seam, the material initially tears one of the two tab sections against the dividing recess. The resulting material stresses continue from the release cut into the pressure conversion line and cause the film to continue to tear exactly at the pressure conversion line. This results in a controlled cracking, which leads to an opening of the package in the back seam. However, the opening location is limited to the area of the one tab section, so that the remaining, non-torn packaging material, including the opposite sealing section or tab section, can be reused for storing residual quantities of the contents of the package.

In a preferred embodiment of the invention, the tubular bag packaging on a back part, adjacent to which the tab portion along a folding line. The pressure conversion line advantageously runs in the tab section between the sealing section and the inflexible line, ie not within the sealed sealed section. The tearing of the tubular bag packaging along the pressure conversion line is not hindered by the adhesive force of the sealing section. However, it may also be expedient for the pressure conversion line to run within the sealing section on its side facing the fold-over line, ie close to the edge of the sealed seal section, where the influence of the adhesive force of the seal section is low. As a result, the pressure conversion line of the one seal section is supported by the adhered, opposite seal section and therefore can not rupture prematurely. Only when targeted tearing the crack formation sets along the predetermined line shape by the pressure forming line, with only the pressure-deformed seal section tears. While still a part of the pressure-deformed seal portion adheres to the opposite seal section. However, this adhesive area is so narrow that it can easily be pulled off by hand in a single movement, in particular without damaging the film material.

Advantageously, several, in particular three mutually parallel pressure forming lines are provided. The advantages of several pressure forming lines are particularly evident in connection with several cutting incisions. It should be noted that the separation cuts and the pressure forming lines are generated in an advantageous embodiment of the invention in separate steps and therefore not necessarily directly above each other. In the arrangement of a plurality of mutually parallel pressure forming lines but it is ensured that at least one of the separating incisions is either directly in overlap with one of the pressure forming lines or has only a very small distance thereto. As a result, it is ensured that the crack beginning at the separating incision migrates to the closest pressure-forming line, where it continues in a controlled manner along the pressure-forming line.

According to the inventive method for producing said tubular bag packaging is provided in an appropriate development that the sealed back seam is made by means of two sealing rolls with the interposition of the two sealing sections, and wherein at least one of the sealing rollers has a profiling, with which the at least one pressure deformation line is generated.

Sealing and pressure forming line are produced in only one cost-saving operation. It is ensured that the pressure conversion line runs exactly at the intended location within the tab section and thereby has its desired relative position to the sealed seam or back seam. Since the pressure deformation line is generated during the sealing process, it experiences a support by the opposite sealing or tab portion, so that premature tearing and thus damage to the tubular bag packaging are reliably avoided during the manufacturing process.

In an advantageous embodiment of the method, the profiling on a region with locally increased contact pressure, wherein the pressure deformation line is generated by the locally increased contact pressure. In particular, it may be advantageous that the profiling of a sealing roller has at least one circumferential sharp edge, and that the other sealing roller has a profiling with at least one concavely rounded circumferential groove, wherein the at least one circumferential sharp edge during the sealing process in the at least one concave rounded circumferential groove engages to generate the locally increased contact pressure.

The locally increased contact pressure ensures that a reliable seal is produced in the adjacent areas with relatively lower contact pressure, while the locally increased contact pressure also produces a one-sided pressure conversion line. By adapted design of the locally increased contact pressure ensures that the corresponding seal section, although provided under pressure by plastic cold deformation with a pressure deformation line, but not completely severed. In the preferred embodiment with the at least one circumferential sharp edge is generated by this sharp edge of the locally increased contact pressure and thus the pressure deformation line only on one side of the film, while the opposite side of the film or the opposite tab portion comes to rest in the concave rounded groove and there is exposed to a reduced compared to surface pressure ,

In addition, it may be appropriate that on at least one side and in particular on both sides of the circumferential sharp edge a convex circular convex circular bead is provided as part of the profiling of a sealing roller, wherein the radius of curvature of the annular bead smaller than the radius of curvature of the concave rounded circumferential Groove of the other sealing roller, and wherein the annular bead engages during the sealing process in the concavely rounded circumferential groove of the other sealing roller for generating the locally increased contact pressure. As a result, a complementary plastic material deformation is generated laterally of the sharp edge, which favors a clean crack along, but not necessarily favors exactly on the pressure deformation line.

Fig. 1

in schematischer Darstellung eine von einer Rolle abgezogene Folie mit Siegelabschnitten zur Bildung der erfindungsgemäßen Schlauchbeutelverpackung;

Fig. 2

eine schematische Querschnittsdarstellung der Folie nach Fig. 1 beim schlauchförmigen Umschließen eines blockförmigen Lebensmittelsproduktes;

Fig. 3

die Anordnung nach Fig. 2 mit versiegelter und umgelegter, eine linienförmige Querschnittsschwächung aufweisender Rückennaht;

Fig. 4

eine Draufsicht der Anordnung nach Fig. 3 mit mehreren, in einem Folienschlauch angeordneten blockförmigen Lebensmitteln und dazwischen angeordneten Quernähten;

Fig. 5

eine Draufsicht eines einzelnen, aus der Anordnung nach Fig. 4 herausgetrennten Lebensmittelsproduktes mit Einzelheiten zur Ausgestaltung der Rückennaht und der dort verlaufenden linienförmigen Querschnittsschwächung;

Fig. 6

eine Querschnittsdarstellung der Anordnung nach Fig. 5 beim Aufreißvorgang;

Fig. 7

in einer Draufsicht ein Paar von Siegelrollen zur Herstellung der gesiegelten Rückennaht nach den Fig. 2 bis 6;

Fig. 8

die vergrößerte Einzelheit VIII nach Fig. 7 mit Details der Siegelrollenprofilierung zur Erzeugung eines lokal erhöhten Anpressdruckes und damit der Druckumformungslinie.

An embodiment of the invention is described below with reference to the drawing. Show it:

Fig. 1

in a schematic representation of a withdrawn from a roll film with sealing portions to form the tubular bag packaging according to the invention;

Fig. 2

a schematic cross-sectional view of the film according to Fig. 1 in the tubular enclosure of a block-shaped food product;

Fig. 3

the arrangement after Fig. 2 with sealed and folded, a line-shaped cross-sectional weakening having back seam;

Fig. 4

a plan view of the arrangement according to Fig. 3 with several, arranged in a film tube block-shaped foods and arranged therebetween transverse seams;

Fig. 5

a plan view of an individual, according to the arrangement Fig. 4 separated food product with details of the design of the back seam and there extending line-shaped cross-sectional weakening;

Fig. 6

a cross-sectional view of the arrangement according to Fig. 5 during the tearing process;

Fig. 7

in a plan view of a pair of sealing rollers for producing the sealed back seam after the Fig. 2 to 6 ;

Fig. 8

the magnified detail VIII Fig. 7 with details of the seal roller profiling to generate a locally increased contact pressure and thus the pressure conversion line.

Fig. 1 shows a schematic view of a film 5 for the production of in the Fig. 2 to 6 The tubular film packaging 1 shown. The film 5 consists of a suitable for the packaging of food plastic material. Preferably, OPP (Oriented Polypropylene) is used, in particular in a multilayer construction with an external acrylic coating. The thickness of the film 5 is preferably in a range of from 35 μm to 45 μm inclusive. The film 5 is withdrawn as a continuous material from a roll according to arrows 25 and 26 and fed to further processing. The film 5 extends in a longitudinal direction 3, which extends in the withdrawal direction indicated by the arrow 26, and transversely to the longitudinal direction 3 in a transverse direction 4. The film is bounded laterally by extending in the longitudinal direction 3 longitudinal edges 6, 7. The film 5 is in a central front part 29, one adjacent to the longitudinal edge 6 first back part 30, one to the opposite longitudinal edge. 7 adjacent tab portion 37 and a second, lying between the front part 29 and the tab portion 37 back portion 31 divided. The tab section 37 adjoins the second back section 31 along a folding line 36 described in more detail below. Along each longitudinal edge 6, 7, the film 5 is provided with a respective sealing section 8, 9, wherein the sealing portion 9 is located within the tab portion 37, that is part of the tab portion 37. In addition, in the transverse direction 4 extending sealing portions 27, 28 are provided, which are arranged with respect to the longitudinal direction 3 at a distance from each other, and together with the along the longitudinal edges 6, 7 extending sealing portions 8, 9 form a rectangular frame. The frame and a film piece defined thereby are delimited outside the sealing sections 8, 9 by the longitudinal edges 6, 7 and outside the sealing sections 27, 28 by cutting lines 35. The initially continuous coherent film 5 is only later in the manner described in more detail below on in the transverse direction 4 extending cutting lines 35 (FIG. Fig. 4 ), in which case along the cutting lines 35 transverse edges 11, 12 as well as front edges 19 of a sealed back seam 10 (FIG. Fig. 5 ) arise.

For the sake of clarity, only a single piece of film bounded by the longitudinal edges 6, 7 and the cutting lines 35 is intended to form a single tubular bag package 1 (FIG. Fig. 2 to 6 ). In fact, however, a large number of such film pieces, which are initially still in one piece, adjoin one another directly at the cutting lines 35.

The sealing section 9 lying adjacent to the longitudinal edge 7 is divided into a center section 17 lying between the sealing sections 27, 28 extending in the transverse direction 4 and end sections 18 lying in the covering area with the two sealing sections 27, 28. The end portions 18 are bounded in the longitudinal direction 3 by the cutting lines 35.

In the region of the cutting lines 35 and within the tab portion 37, at least one line-shaped separating incision 51 is attached. The at least one separating cut 51 starts from the cutting line 35 and extends at least within the tab section 37 approximately parallel to the longitudinal direction 3. In the exemplary embodiment shown, at least one separating incision 51, preferably several and here five separating incisions 51 are provided with respect to the aforementioned single piece of film on both opposite lines 35, which extend parallel to each other and the longitudinal direction 3, and starting from the cutting line 35 into the tab portion 37, each extending over a length of 1.0 mm to 3.0 mm inclusive, here about 2.0 mm. The length is chosen so that the separating cuts 51 are completely within the sealing portions 9, 27, 28.

A part of the separating incisions 51, here the larger part in the form of three separating incisions 51 extends in the tab portion 37 with respect to the transverse direction 4 between the sealing portion 9 and the folding line 36, while the remaining part, here the smaller part in the form of two separating incisions 51 in Tab portion 37 within the sealing portion 9 relative to the transverse direction 4 on the folding line 36 facing side or half runs. But it can also be useful another division, in which the greater part of the separating cuts 51 or even all separating cuts 51 in the tab portion 37 between the sealing portion 9 and the inflection line 36 are. The separating incisions 51 are arranged with respect to the transverse direction 4 at a distance of approximately 1.5 mm from one another. The separating incisions 51 can be present in the roll-wound state of delivery of the film 5 or can be introduced subsequently after the film 5 has been removed from the roll and before the sealing process described below. At the opposite sealing portion 8 such separation cuts 51 are not provided.

Fig. 2 shows in a schematic cross-sectional representation of a block-shaped, hard food on the example of a chocolate bar 2 during the packaging process with the film 5 after Fig. 1 , But it can also be provided another block-shaped food. During the packaging process, the chocolate bar 2 is covered by the front part 29 of the film 5, so that the two back parts 30, 31 project laterally beyond the chocolate bar 2 in the transverse direction 4. The back parts 30, 31 are according to arrows 32, 33 down to the chocolate bar 2 to form a tubular bag packaging 1 laid around. Here, the two meet in the longitudinal direction 3 ( Fig. 1 ) extending sealing portions 8, 9 so flat against each other that they protrude from the tubular bag packaging 1 and each rest with their otherwise the chocolate bar 2 facing inside together. At at least one of the two sealing sections 8, 9 a schematically indicated cold seal 41 is attached, by means of which the two sealing sections 8, 9 under contact pressure in the direction of arrows 34 to form a longitudinal direction 3 (FIG. Fig. 4 ) running back seam 10 are sealed together. Instead of the cold seal 41, a heat seal glue or other form of sealing may also be appropriate.

The sealing of the back seam 10 takes place between two sealing rollers 52, 53, as described below in connection with FIGS Fig. 7, 8 described. During sealing, at least one pressure conversion line 15 is simultaneously produced in that flap section 37, which is also connected to the at least one separating cut 51 (FIG. Fig. 1 ) is provided. In the area of the further sealing section 8 or an associated tab portion, not specified, the foil 5 has neither a separating incision 51 nor a pressure deformation line 15. In Fig. 2 It can be seen that the indicated pressure deformation line 15 is indeed within the tab portion 37, but not within the sealing portion 9 sealed by the cold seal member 41 with the sealing portion 8.

After sealing the back seam 10, this is folded according to an arrow 42 flat on the tubular bag 1, as shown in the schematic cross-sectional view Fig. 3 is shown. The back seam 10 is hereby designed as a transfer seam, which lies flat on the second back part 31 with the tab section 37 and its two seal sections 8, 9. The transfer direction according to the arrow 42 is selected such that the tab portion 37 with the at least one pressure deformation line 15 and the at least one separating incision 51 (FIG. Fig. 1 ) is folded or folded down by 180 ° relative to the second back part 31 along the fold line 36, rests directly and flat on the second back part 31 and is covered to the outside, ie from the chocolate bar 2, by the further seal section 8.

Fig. 4 shows a plan view of the arrangement according to Fig. 3 according to which the film 5 as a whole is closed to form an initially endless tube along the back seam 10, which is designed as a transfer seam, and encloses a row of chocolate bars 2 in the form of a tube. It can be seen that the back seam 10 and also the at least one pressure conversion line 15 runs continuously in the longitudinal direction 3. The pressure deformation line 15 extends within the tab portion 37 and lies relative to the transverse direction 4 between the sealed seal portions 8, 9 and the inflexible line 36. Between the individual chocolate bars 2, the sealing portions 27, 28 extending in the transverse direction 4 lie behind Fig. 1 , which are sealed in this state to form transverse seams 13, 14. Between the directly adjacent transverse seams 13, 14 in each case in connection with Fig. 1 mentioned section line 35 along which the film tube is severed in the transverse direction 4. This results in isolated food products 24, in which the chocolate bar 2, each with a single tubular bag packaging 1 is hermetically sealed.

Fig. 5 shows in a schematic plan view of such a single, above-described food product 24 with the tubular bag packaging 1, which is closed along the back seam 10 and along the two transverse seams 13, 14 and sealed. In the shown folded state of the back seam 10 is indeed as described above, the sealing portion 8 without pressure forming lines 15 above or on the outside of the provided with the pressure deformation line 15 tab portion 37. However, for better clarity, the at least one pressure deformation line 15 is drawn with a solid line. In addition, however, a design may be expedient in which actually the pressure deformation line 15 is not arranged in the lower, covered tab portion 37, but in the upper, exposed tab portion with the sealing portion 8. In addition to the schematic representation of the Fig. 2 to 4 not only is a pressure conversion line 15 shown. Rather, it is optionally possible to provide several and, as illustrated here, preferably three line-shaped pressure conversion lines 15 and in this case run parallel to one another.

The two sealing sections 8, 9 extending in the longitudinal direction 3 have a width b which is defined by the width of the cold sealing ledge 41 (FIG. Fig. 2 ) or another sealant is predetermined. It can be seen that the pressure deformation lines 15 extend along the entire back seam 10 and, at the same time, the largest part, relative to the transverse direction 4, outside the width b. In addition, the pressure forming lines 15 extend in a straight line parallel to the longitudinal direction 3 over the entire length of the back seam 10. Two of the pressure deformation lines 15 extend in the tab portion 37 with respect to the transverse direction 4 between the sealing portion 9 and the inflection line 36. Optionally, a pressure deformation line 15, here the third pressure deformation line 15 within the sealing portion 9 on the folding line 36 facing side or half close to the edge of the sealing portion. 9

The tubular bag package 1 has in the transverse direction 4 extending transverse edges 11, 12, where it is sealed by means of the transverse seams 13, 14. In addition, the back seam 10 adjacent to the two transverse seams 13, 14 each have an end edge 19 with the width of the tab portion 37, which lie flat in the folded state of the back seam 10 and parallel to the transverse edges 11,12. The front edges 19 of the back seam 10, together with the transverse edges 11, 12 each have a crossing point 16, the in Fig. 6 can be seen more clearly.

The front edges 19, together with the transverse edges 11, 12, are cut by the above-described section along the cutting lines 35 (FIG. Fig. 4 ) and executed here as a jaw cut 20. Instead of the serrated cuts 20 but also straight cuts can be provided. The front edges 19 and the transverse edges 11,12 are now at the point where previously the cutting lines 35 ( Fig. 1 ) were. Accordingly, the separating incisions 51, starting from the end edges 19, extend parallel to the longitudinal direction 3 with those associated with FIG Fig. 1 specified dimensions and other features. The separation cuts 51 are either immediately adjacent to at least one pressure conversion line 15 or even in overlap therewith, and form a tear-rupture aid for rupture of the tubular pouch packaging 1. By manual pulling on the end section 18, tearing of the seal section 9 at one of the separation cuts 51 is thereby effected initiated. The resulting crack travels to the nearest pressure forming line 15 and continues along along the entire length of the back seam 10.

Fig. 6 shows a schematic front view of the food product 24 after Fig. 5 the opening process of the tubular bag packaging 1. Starting from the flat folded position of the back seam 10 after the Fig. 3 to 5 the back seam 10 is manually pulled according to an arrow 38 in the upright position, in which case the intersection point 16 between the end edge 19 and the adjacent transverse edge 11, 12 (FIG. Fig. 5 ) becomes clearly visible. For opening the tubular bag packaging 1, the user preferably grips the sealed back seam 10 at one of the end sections 18 (FIG. Fig. 5 ) and exerts sideways upward pull according to an arrow 39. For the sake of clarity, here again only one of a plurality of pressure conversion lines 15 is shown. From the synopsis of FIGS. 5 and 6 As a result, the crack initiated on a separating incision 51 continues on further pulling along the entire pressure-forming line 15, but only the tab portion 37 is severed.

Due to the absence of separating incisions 51 in the opposite tab section with the sealing section 8, this does not break. The sealing portion 8 is withdrawn according to the arrow 39 together with the adjacent first back portion 30, wherein the two transverse seams 13, 14 are pulled without further uncontrolled tearing of the film 5. If the tubular bag packaging 1 is torn open along such a pressure conversion line 15, which is located between the sealing section 9 and the fold-over line 36, the back seam 10 does not have to be pulled up against the sealed seal sections 8, 9, whereby the manual effort is low. If, however, the tubular bag packaging 1 is torn open along the pressure deformation line 15 which lies within the sealing section 9, only part of the back seam 10 has to be pulled up against the sealed sealing sections 8, 9. The outer, between the longitudinal edge 7 and the pressure forming line 15 remaining and larger part of the sealing portion 9 remains adhered to the sealing portion 8, so that for subtracting the inner, smaller and connected to the second back portion 31 of the sealing portion 9 no significant increase in the required manual effort entry. The remaining part of the tab portion 37, possibly also the sealing portion 9 remains undamaged with the second back portion 31. The film 5 is torn open only along the pressure deformation line 15 and otherwise has no further cracks or damage. Remains of the broken chocolate bar 2 or other block-shaped food product can therefore be readily stored in the open tubular bag packaging 1 further.

In addition, the tubular bag packaging 1 with its back seam 10 by the geometric design and type of Versieglung in known manner as a so-called "kink-pack" executed. By buckling or breaking the chocolate bar 2, the back seam 10 can be pulled up at the same time, which then does not open along one of the pressure deformation lines 15. This provides the user with two opening mechanisms as an alternative. In the context of the invention, however, the additional configuration as a so-called "kink pack" can also be dispensed with.

Fig. 7 shows in a plan view a pair of sealing rollers for producing the sealed back seam 10 after the Fig. 2 to 6 in an embodiment of the manufacturing method according to the invention. Both sealing rollers 52, 53 are rotatably mounted in opposite directions about axially parallel axes of rotation 60, 61 and rotationally driven. One sealing roller 53 is adjustable relative to the other sealing roller 52 according to arrows 62, 63 in its radial distance such that a gap dimension s between the peripheral surfaces of the sealing rollers 52, 53 can be adjusted.

The two sealing rollers 52, 53 are shown during the sealing of the back seam 10. For this purpose, the tubular bag packaging 1 with the chocolate bar 2 contained therein for forming the food product 24 as shown Fig. 2 brought so to the pair of sealing rollers 52, 53, that the still upstanding, not folded back seam 10 passes through the gap between the peripheral surfaces of the sealing rollers 52, 53. The gap dimension s is set such that the back seam 10 provides a sufficient surface pressure for sealing by means of the cold seal seal 41 (FIG. Fig. 2 ) learns. If instead of the cold seal standard 41 ( Fig. 2 ), a heat sealer or the like is provided is, the peripheral surfaces of the sealing roller 52, 53 may also be heated, but the heated area on the region of the sealing portions 8, 9 (FIG. Fig. 5 ) and not the area of the pressure forming lines 15 (FIG. Fig. 5 ). In any case, a sealing of the back seam 10 at the sealing portions 8, 9 ( Fig. 5 ). By opposing rotation of the sealing rollers 52, 53 while the back seam 10 is formed with respect to the longitudinal direction 3 in an endless process with any length as shown Fig. 4 ,

Fig. 8 shows the enlarged detail VIII Fig. 7 In the region of the adjoining peripheral surfaces of the two sealing rollers 52, 53. Both sealing rollers 52, 53 have on their peripheral surfaces in each case a circumferential profiling 54 and a circumferential profiling 55, which are wave-shaped in cross-section. In each case, a wave crest of a sealing roller 52, 53 engages in each case a trough of the opposite sealing roller 53, 52. In between are the two sealing sections 8, 9, which are sealed together according to the aforementioned waveform.

In addition, the illustration is after Fig. 8 can be seen that the profiling 54 of a sealing roller 52 is designed due to its geometric configuration to generate a locally increased contact pressure and thereby to generate the pressure forming lines 15. In the embodiment according to Fig. 8 For this purpose, the profiling 54 of one sealing roller 52 has at least one peripheral sharp edge 58, here two circumferential sharp edges 58 and a rounded curvature. The profiling 55 of the other sealing roller 53 has at least one, here three concave in cross-section rounded grooves 59, wherein the circumferential sharp edges 58 of a sealing roller 52 during the sealing process in the associated concave grooves 59 of the other sealing roller 53 for generating the local intervene increased contact pressure. In addition, optionally with respect to the axial direction on at least one side, here on both sides of the circumferential sharp edges 58 per a convexly rounded in cross-section annular bead 56 as part of the profiling 54 of a seal roller 52 is provided. The radius of curvature of the annular beads 56 is smaller than the radius of curvature the concave rounded circumferential grooves 59 of the other sealing roller 53. Also, the annular beads 56 engage during the sealing process in the associated concave grooves 59 of the other sealing roller 53 for generating the locally increased contact pressure. Away from the circumferential sharp edges 58 and the circumferential annular beads 56, the profiling 54 corresponds to one sealing roller 52 of the profiling 55 of the other sealing roller 53. This ensures that the otherwise constant gap dimension s (FIG. Fig. 7 ) is locally smaller in the region of the sharp edges 58 and the annular beads 56 than in the remaining sections of the profilings 54, 55. In addition to the sealing of the sealing portions 8, 9 against each other between the sealing rollers 52, 53, the tab portion 37 is provided at the aforementioned locations by locally excessive surface pressure with the pressure forming lines 15, but without the tab portion 37 is thereby completely severed. The tab portion 37 experiences at the circumferential sharp edges 59 and also at the annular beads 56 a locally increased contact pressure, whereby the pressure forming lines 15 (FIG. Fig. 5 ) are produced by plastic cold deformation of the film material. However, the opposite sealing portion 8 lies in the rounded grooves 59, whereby there the local contact pressure is lower and such a plastic pressure deformation does not occur. The pressure deformation of the film material takes place primarily on the sharp edges 58, but to a lesser extent also on the annular beads 56. It can also be seen that the outer edge of the sealing roller 52 is rounded in the region of the folding line 36. This ensures that at the inflection line 36 no pressure deformation of the film material takes place and therefore the film material can not tear uncontrollably at this point.

Claims (15)

Tubular bag package (1) for block-shaped foods, in particular for chocolate bars (2), the tubular bag package (1) extending in a longitudinal direction (3) and in a transverse direction (4), comprising a film (5) in the longitudinal direction (3). extending longitudinal edges (6, 7), wherein the film (5) along its first longitudinal edge (6) extending sealing portion (8) and a second longitudinal edge (7) adjacent tab portion (37) with another, along the second longitudinal edge ( 7) extending seal portion (9) has, wherein the film (5) at the sealing portions (8, 9) to form a longitudinally extending (3), continuous, and designed as Umlegenaht sealed back seam (10) is closed in a tubular shape, and wherein the tubular bag package (1) at its in the longitudinal direction (3) opposite transverse edges (11, 12) by means of in the transverse direction (4) extending transverse seams (13, 14) sealed i st,
characterized in that the back seam (10) adjacent to the transverse seam (13, 14) has an end edge (19), and that the tab portion (37) in the region of the end edge (19) provided with at least one line-shaped separating incision (51) as a tear is, wherein the separating incision (51) from the end edge (19) starts and extends at least approximately parallel to the longitudinal direction (3). Tubular bag packaging according to claim 1,
characterized in that in each case at least one separating incision (51) is provided on two opposite end edges (19). Tubular bag package according to claim 1 or 2,
characterized in that at the front edge (19) a plurality and in particular five separating cuts (51) are provided. Tubular bag packaging according to claim 3,
characterized in that the separating incisions (51) are arranged at a distance of about 1.5 mm from each other. Tubular bag packaging according to one of claims 1 to 4,
characterized in that the separating incision (51) starting from the end edge (19) has a length (1) of 1.0 mm inclusive including 3.0 mm. Tubular bag packaging according to one of claims 1 to 5,
characterized in that the film (5) in the region of the sealing portion (9) with the at least one line-shaped separating incision (51) has a pressure conversion line (15), wherein the pressure deformation line (15) at least approximately parallel to the longitudinal direction (3). Tubular bag packaging according to claim 6,
characterized in that the pressure conversion line (15) runs along the entire back seam (10). Tubular bag package according to claim 6 or 7,
characterized in that the tubular bag package has a back portion (31) to which the flap portion (37) adjoins along a fold line (36), and that the pressure conversion line (15) in the tab portion (37) between the seal portion (9) and the fold line ( 36) or in the sealing portion (9) on which the inflection line (36) facing side extends. Tubular bag packaging according to one of claims 6 to 8,
characterized in that a plurality, in particular two mutually parallel pressure forming lines (15) are provided. A food product (24) comprising a block-shaped food, in particular a chocolate bar (2), the food being packaged in a tubular bag package (1) according to any one of claims 1 to 9. A method for producing a tubular bag packaging (1) for block-shaped foods, in particular for chocolate bars (2), wherein a tubular bag packaging (1) extending in a longitudinal direction (3) and in a transverse direction (4), a film (5) with in the longitudinal direction (3) extending longitudinal edges (6, 7), wherein the film (5) along its first longitudinal edge (6) extending sealing portion (8) and a second longitudinal edge (7) adjacent tab portion (37) with a further , the sealing portion (9) running along the second longitudinal edge (7), the foil (5) forming at the sealing portions (8, 9) a continuous, sealed rear seam (10) running in the longitudinal direction (3) ) is closed in a tubular shape, and wherein the tubular bag package (1) at its in the longitudinal direction (3) opposite transverse edges (11,12) by means in the transverse direction (4) extending n transverse seams (13, 14) is sealed,
characterized in that the back seam (10) adjacent to the transverse seam (13, 14) has an end edge (19), and that the tab portion (37) in the region of the end edge (19) provided with at least one line-shaped separating incision (51) as a tear is, wherein the separating incision (51) from the end edge (19) starts and at least approximately parallel to the longitudinal direction (3). Method according to claim 11,
characterized in that the sealed back seam (10) by means of two sealing rollers (52, 53) with the interposition of the two sealing portions (8, 9) is made, and that at least one of the sealing rollers (52, 53) has a profiling (54), with the pressure conversion line (15) is generated. Method according to claim 12,
characterized in that the profiling (54) has a region with locally increased contact pressure, wherein the pressure deformation line (15) is generated by the locally increased contact pressure. Method according to claim 13,
characterized in that the profiling (54) of one sealing roller (52) has at least one circumferential sharp edge (58), and that the other sealing roller (53) has a profiling (55) with at least one concavely rounded circumferential groove (59), wherein the at least one circumferential sharp edge (58) of the one sealing roller (52) engages during the sealing process in the at least one concavely rounded circumferential groove (59) of the other sealing roller (53) for generating the locally increased contact pressure. Method according to claim 14,
characterized in that on at least one side and in particular on both sides of the circumferential sharp edge (58) a convexly rounded in cross-section circular annular bead (56) as part of the profiling (54) of the one Seal roller (52) is provided, wherein the radius of curvature of the annular bead (56) is smaller than the radius of curvature of the concave rounded circumferential groove (59) of the other sealing roller (53), and wherein the annular bead (56) during the sealing process in the concave rounded circumferential Groove (59) of the other sealing roller (53) engages to generate the locally increased contact pressure.

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