EP4265537A1 - Paper tubular bag and method of making the same - Google Patents

Abstract

Tubular paper bag (1) comprising a bendable base paper sheet (2) with two longitudinal edges (6) and a first transverse edge (7a) and a second transverse edge (7b), the base paper sheet (2) being bent over into a tubular shape when viewed in a first direction (3). is and at least partially delimits a receiving volume (9), the longitudinal edge regions (8) of the base paper sheet (2) having longitudinal edges (6) overlapping and being sealed with one another in order to close the tubular shape as seen in a circumferential direction (12), whereby a the first transverse edge region (10a) having the first transverse edge (7a) is sealed and a second transverse edge region (10b) having the second transverse edge (7b) is sealed in order to close the paper tubular bag (1) in the first direction (3), the base paper sheet (2 ) is glued in a flat reinforcing section (11) with a reinforcing paper sheet (13) and at least one hole (14) forming a through opening from the receiving volume (9) to the outside is provided in the reinforcing section (11).

Description

FIELD OF THE INVENTION

The present invention relates to a paper tubular bag, a method for its production and a paper tubular bag blank for the method according to the invention for producing the paper tubular bag according to the invention.

STATE OF THE ART

Tubular bags are particularly popular for packaging food. The material used for the tubular bags is primarily plastic, which is typically provided as tape or rolls.

Typically, when producing the tubular bag filled with packaged goods, the band is arranged with a (unrolled) section over the packaged goods and bent into a tube around the packaged goods and then sealed under the packaged goods. The tube is pressed together in front of and behind the packaged goods, and is also sealed and, if necessary, cut off, resulting in the filled tubular bag.

Plastic has several advantages as a material for tubular bags. On the one hand, the plastic has to be used for this Sealing only needs to be heated sufficiently, meaning no additional adhesive is necessary. On the other hand, the plastic can be colored or printed in any way, and in particular transparent areas of the tubular bag can be easily produced so that the packaged goods are visible from the outside. Furthermore, depending on the application, holes can easily be provided in the tubular bag, for example for packaging fruit.

However, the major disadvantage of plastic material is the environmental problem, particularly with regard to disposal and consumer perception.

Alternatives known from the prior art that are based on cellulose-based plastics can alleviate problems in disposal, but are highly problematic in production due to the toxic substances produced. In addition, the consumer hardly or not at all recognizes that an alternative material has actually been used.

OBJECT OF THE INVENTION

It is therefore the object of the present invention to provide an alternative tubular bag and a manufacturing process for it, which overcome the disadvantages mentioned. In particular, the alternative tubular bag should meet current and future environmental requirements and should also be recognizable as such to consumers. Preferably, existing manufacturing systems that work with plastic material should be able to continue to be used, if possible, without or only with minor modifications.

PRESENTATION OF THE INVENTION

The core of the present invention to solve the stated problem is to use paper as a material for an alternative tubular bag, i.e. to provide a paper tubular bag. This means that the environmental requirements mentioned above can be easily met. The paper material is immediately recognizable both visually and haptically to the user or consumer, which means that the paper tubular bag is immediately and easily recognizable to the user as being environmentally friendly. By providing at least one hole in the paper tubular bag, visibility of the packaged goods can be ensured, although holes are absolutely necessary anyway, especially when packaging food such as fruit. However, it turns out that the paper, which must be sufficiently bendable in order to be formed into the necessary tube shape, as is usual in existing manufacturing systems, tears very easily in the area of the holes. Another essential point of the present invention is therefore to avoid this tearing.

For this purpose, according to the invention, a tubular paper bag is provided, comprising a bendable base paper sheet with two longitudinal edges which extend at least in sections with a directional portion parallel to a first direction and a first transverse edge and a second transverse edge, which extend at least in sections with a directional portion parallel to a second direction and the limit the base paper sheet as seen in the first direction, the base paper sheet being bent into a tubular shape as seen in the first direction and at least partially delimiting a receiving volume, the longitudinal edge regions of the base paper sheet having longitudinal edges overlapping and being sealed with one another in order to close the tubular shape as seen in a circumferential direction , where the recording volume is in the first direction, the second Direction and a third direction extends and the first direction, the second direction and the third direction are mutually normal to one another, wherein a first transverse edge region having the first transverse edge is sealed and a second transverse edge region having the second transverse edge is sealed to the tubular paper bag in the first direction to close, wherein the base paper sheet is glued to a reinforcing paper sheet in a flat reinforcement section and at least one hole forming a through opening from the receiving volume to the outside is provided in the reinforcement section.

The bendable base paper sheet allows it to be easily bent into the tube shape, which is an important prerequisite for the production of the paper tubular bag with existing machines designed for plastics. For the sake of completeness, it should be noted that cardboard does not have sufficient flexibility, although cardboard differs from paper in particular in its higher basis weight of more than 150 g/m ² , cf. e.g. https://de.wikipedia.org/wiki/Karton ( Material).

In the case of the manufactured paper tubular bag, the longitudinal edges typically run essentially parallel to the first direction over a usually large section, with at least one curvature usually being present in the area of the sealed transverse areas, i.e. in the area of the ends of the paper tubular bag, with the course of the longitudinal edges in the area of the sealed Transverse areas have at least one directional component parallel to the third direction.

Typically, viewed in the first direction, the first transverse edge is arranged in front of the second transverse edge.

The hose shape is to be understood in the broadest sense, in particular so that the hose shape is also present in the sealed transverse areas where the shape or Tube shape corresponds to that of a compressed tube without a clear cross section. In the area of the receiving volume, however, there is in any case a clear cross section of the tube shape.

The receiving volume is used to hold packaged goods, whereby the packaged goods can be arranged in the receiving volume before or during the manufacturing process of the paper tubular bag.

The sealing takes place by gluing using a known sealing adhesive, which can be, for example, a sealing wax, resulting in an adhesive seam, typically in the form of a glued strip. The sealing adhesive can be heated and/or the areas to be sealed can be put under pressure.

In particular, when sealing the first and second transverse edge regions, these or the ends of the tubular paper bag are typically pressed together during sealing, so that preferably essentially each part of the respective transverse edge region overlaps and is glued/sealed with another part of the respective transverse edge region.

If both transverse edge areas are sealed, the paper tubular bag - and thus the receiving volume - is closed when viewed parallel to the first direction. The closing in the second and third directions or in the circumferential direction results from the production of the tube shape and the sealing of the longitudinal edge areas.

In order to prevent the base paper sheet from tearing in the area of the minimum hole, the base paper sheet is to be glued to the reinforcing paper sheet - but only in the area Reinforcement section in order not to hinder or impair the problem-free bending to the hose shape.

It should be noted that not only the reinforcing paper sheet, but also its gluing contributes to the mechanical reinforcement of the base paper sheet.

As with sealing, bonding is also achieved using known means. For example, the already mentioned sealing adhesive, in particular in the form of a sealing wax, can be provided for this purpose. Another example of gluing the base paper sheet to the reinforcing paper sheet would be lamination, i.e. a flat bond, using a known laminating adhesive.

The at least one hole forms a through opening of the paper tubular bag from the outside into the receiving volume and vice versa. I.e. the respective hole is present both in the base paper sheet and in the reinforcing paper sheet or forms a through opening which extends through the base paper sheet and through the reinforcing paper sheet and any layers that may be present in between, in particular any adhesive layer that may be present.

In order to be able to optimally ensure the bending into the tubular shape, it is provided in a preferred embodiment of the paper tubular bag according to the invention that the reinforcing section, viewed in the circumferential direction, only extends over a limited area of the base paper sheet, preferably only in a half-space that is defined by a plane , which contains a longitudinal axis of the tubular paper bag that runs parallel to the first direction, and that the reinforcing section extends at least in sections, preferably completely, over the base paper sheet when viewed in the first direction. It also extends accordingly the reinforcing paper sheet in the circumferential direction only over a limited area of the base paper sheet.

The limitation of the, in particular circumferential, extent to the said half space means in practice that the reinforcing section is typically arranged only on one upper side of the paper tubular bag, the upper side being arranged opposite the overlapping longitudinal edge regions.

Since the reinforcing section or the reinforcing paper sheet extends completely over the base paper sheet when viewed in the first direction, i.e. from the first transverse edge to the second transverse edge, a tubular paper bag blank designed as a roll product can be provided for production with a correspondingly continuous reinforcing section or reinforcing paper sheet, which in turn favors the production of the paper tubular bag blank.

It is conceivable that the reinforcing paper sheet is arranged on an outside of the paper tubular bag and is visible from the outside. In order to be able to make the paper tubular bag particularly visually appealing, it is provided in a preferred embodiment of the paper tubular bag according to the invention that the reinforcing paper sheet is arranged in the paper tubular bag. I.e. the reinforcing paper sheet is arranged on an inside of the paper tubular bag, which faces into the receiving volume, and is not visible from the outside, so that the external appearance is not influenced or even disturbed by the reinforcing paper sheet. Accordingly, a free surface of the reinforcing paper sheet also points into the receiving volume.

In principle, cases are conceivable in which the same material is used for the base paper sheet and the reinforcing paper sheet. In particular it is It is conceivable that the basis weight of the reinforcing paper sheet is the same or even slightly lower than the basis weight of the base paper sheet.

However, in order to achieve a particularly high mechanical reinforcement and still achieve sufficient flexibility, a paper with a higher basis weight compared to the base paper sheet can be selected as the reinforcing paper sheet, since no strong bends are necessary in the area of the reinforcing section, but the basis weight of the reinforcing paper sheet is in can be chosen with a view to high tensile strength. In contrast, the basis weight of the base paper sheet can be selected for high flexibility. For example, a thin printing paper can be selected as the base paper sheet and a work printing paper as the reinforcing paper sheet. Accordingly, in a preferred embodiment of the paper tubular bag according to the invention, it is provided that the basis weight of the base paper sheet is in the range from 25 g/m ² to 60 g/m ² , preferably from 30 g/m ² to 50 g/m ² , and/or that the basis weight of the reinforcing paper sheet is in the range from 20 g/m ² to 120 g/m ² , preferably from 80 g/m ² to 120 g/m ² , particularly preferably from 80 g/m ² to 90 g/m ² . The choice of the basis weights, in particular the basis weight of the reinforcing paper sheet, typically depends on the respective packaging system.

As already mentioned, the reinforcing paper sheet can be connected to the base paper sheet by lamination, i.e. by surface gluing. With regard to environmental protection, it can be advantageous to apply a sealing adhesive for the said bonding only partially and not - as is usual with lamination - over the entire surface, especially in the entire reinforcement section. Accordingly, in a preferred embodiment of the paper tubular bag according to the invention, it is provided that the reinforcing paper sheet is glued together with the base paper sheet, a sealing adhesive is only partially arranged in the reinforcement section, in particular in the respective area around the at least one hole. As already explained above, suitable sealing adhesives are known per se. By arranging the sealing adhesive around the respective hole, the mechanical reinforcement against tearing caused by the sealing adhesive is largely ensured in the area of the respective hole, since the reinforcement caused by the adhesive used is particularly noticeable in these areas. At the same time, material in the form of sealing adhesive can be saved, which also has a cost-effective effect.

Of course, more than one hole can be provided per tubular paper bag. A wide variety of shapes and sizes are conceivable, so that optimal coordination with the respective packaged goods is possible without any problems. In a preferred embodiment of the paper tubular bag according to the invention it is correspondingly provided that a plurality of holes are provided, the holes preferably having different shapes and/or sizes. The latter is to be understood as meaning that at least two holes have different shapes and/or are of different sizes, although at the same time holes of the same shape or the same size can exist.

In a preferred embodiment of the paper tubular bag according to the invention, it is provided that a sealing adhesive is provided in at least one of the longitudinal edge regions in order to seal the longitudinal edge regions, the sealing adhesive being only partially arranged in the respective longitudinal edge region.

In principle, it is conceivable to seal the longitudinal edge areas only in one longitudinal edge area Sealing adhesive is to be provided, which can then in particular be arranged on the same side of the base paper sheet as the sealing adhesive in the transverse edge areas, which further simplifies production, especially with regard to the production of the paper tubular bag blank as a starting product for the paper tubular bag.

By applying the sealing adhesive not over the entire surface in the respective longitudinal edge area, but only partially, for example in the form of a straight or wavy line, sealing adhesive can be further saved. This is not only favorable in terms of costs, but also in terms of environmental protection and the requirements for waste paper recycling.

Analogously, in a preferred embodiment of the tubular paper bag according to the invention, a sealing adhesive is provided for sealing the first transverse edge region and the second transverse edge region, which is only partially arranged in the respective transverse edge region. By applying the sealing adhesive not over the entire surface in the respective transverse edge area, but only partially, for example in the form of a straight or wavy line, sealing adhesive can be further saved, which in turn is not only favorable in terms of costs, but also in terms of environmental protection and the requirements for waste paper recycling.

In order to meet requirements in particular with regard to the recyclability of the paper tubular bag, it is provided in a preferred embodiment of the paper tubular bag according to the invention that sealing adhesive is provided for the bonding of the base paper sheet to the reinforcing paper sheet and for the sealing of the longitudinal edge regions, the first transverse edge region and the second transverse edge region, where the weight fraction of the Sealing adhesive on the paper tubular bag is a maximum of 5%, preferably a maximum of 3.5%. The low weight content ensures that the paper or the paper tubular bag can be easily recycled. In particular, the low weight proportion can be ensured by partially applying the sealing adhesive.

1. A) Umbiegen des Basispapierblatts zu einer Schlauchform, wobei ein Aufnahmevolumen zumindest abschnittsweise begrenzt wird und wobei die Längskantenbereiche überlappen;
2. B) Versiegeln der Längskantenbereiche;
3. C) sequentielles oder gleichzeitiges Versiegeln der zwei Querbereiche, zwischen denen der Stückbereich angeordnet ist.

Analogous to what has been said above, a method for producing a paper tubular bag according to the invention is provided according to the invention, using a paper tubular bag blank comprising a bendable base paper sheet with two longitudinal edges, sealing adhesive being applied at least in one of two longitudinal edge regions having the longitudinal edges, in transverse regions which are transverse to run along the longitudinal edges and connect them together, sealing adhesive is applied,
wherein a flat reinforcing section is provided between the longitudinal edge regions, in which the base paper sheet is glued to a reinforcing paper sheet and at least one hole passing through the paper tubular bag blank is provided in each piece region of the reinforcing section, the respective piece region being between the longitudinal edge regions and between two transverse regions , which follow one another and are spaced apart from one another by a distance measured along the longitudinal edges, the method comprising the following steps:

1. A) bending the base paper sheet into a tubular shape, with a receiving volume being limited at least in sections and with the longitudinal edge regions overlapping;
2. B) sealing the longitudinal edge areas;
3. C) sequential or simultaneous sealing of the two transverse areas between which the piece area is arranged.

Basically, what has already been said above about the paper tubular bag applies.

The paper tubular bag is manufactured from the paper tubular bag blank, using existing manufacturing machines (designed for plastic). The paper tubular bag blank can be made available as roll goods, which is favorable in terms of costs and the manufacturing process.

The longitudinal edges run essentially parallel to one another and opposite one another.

Preferably, the reinforcing area or the reinforcing paper sheet is spaced from the longitudinal edge areas.

The same sealing adhesive (e.g. a sealing wax) is preferably provided for the different longitudinal edge and transverse areas, particularly preferably also for bonding the reinforcing paper sheet to the base paper sheet.

In the transverse areas, the sealing adhesive is typically applied to both the base paper sheet and the reinforcing paper sheet, for example as a continuous, in particular straight or serpentine or wavy, line.

The sealing of the longitudinal edge regions according to step B) is clearly carried out by means of the sealing adhesive which is arranged in at least one of the longitudinal edge regions.

The sealing of the transverse areas according to step C) is clearly carried out using the sealing adhesive which is arranged in the transverse areas.

In step C), the transverse areas may have already become transverse edge areas, especially if the paper tubular bag blank has been trimmed accordingly. However, it is also conceivable that several paper tubular bags arranged one behind the other are produced at the same time and only after the transverse areas have been sealed are the paper tubular bags produced at the same time separated by cutting or trimming them in the area of the transverse areas.

When sealing the two transverse areas sequentially, the order can basically be arbitrary, i.e. first one then the other transverse area or vice versa.

1. i) falls keine erste Querkante vorhanden ist, Erzeugen einer ersten Querkante durch Abschneiden des Basispapierblatts in einem der Querbereiche, wobei die erste Querkante in einem mit dem Querbereich zumindest abschnittsweise überlappenden ersten Querkantenbereich angeordnet ist;
2. ii) Erzeugen einer zweiten Querkante durch Abschneiden des Basispapierblatts in jenem der Querbereiche, welcher auf den ersten Querkantenbereich folgt, wobei die zweite Querkante in einem mit jenem Querbereich zumindest abschnittsweise überlappenden zweiten Querkantenbereich angeordnet ist;

• und dass das Verfahren in Schritt C) die folgenden Schritte umfasst:
  • iii) Versiegeln des zweiten Querkantenbereichs;
  • iv) Versiegeln des ersten Querkantenbereichs,
• wobei die Reihenfolge der Schritte iii) und iv) vertauschbar ist und/oder die Schritte iii) und iv) auch gleichzeitig erfolgen können. D.h. hier wird der Papierschlauchbeutel vom restlichen Papierschlauchbeutel-Rohling oder ggf. zumindest einem anderen Papierschlauchbeutel, der gleichzeitig erzeugt wird, durch Abschneiden getrennt, bevor ein vollständiges Verschließen des Papierschlauchbeutels an dessen Enden erfolgt.

In a preferred embodiment of the method according to the invention it is provided that the following steps are carried out before step A) or after step B):

1. i) if there is no first transverse edge, producing a first transverse edge by cutting off the base paper sheet in one of the transverse regions, the first transverse edge being arranged in a first transverse edge region which at least partially overlaps the transverse region;
2. ii) producing a second transverse edge by cutting off the base paper sheet in that of the transverse regions which follows the first transverse edge region, the second transverse edge being arranged in a second transverse edge region which at least partially overlaps that transverse region;

• and that the method in step C) comprises the following steps:
  • iii) sealing the second transverse edge area;
  • iv) sealing the first transverse edge area,
• wherein the order of steps iii) and iv) can be interchanged and/or steps iii) and iv) can also take place simultaneously. Ie here the paper tubular bag is separated from the remaining paper tubular bag blank or possibly at least one other paper tubular bag that is produced at the same time by cutting it off before the paper tubular bag is completely closed at its ends.

The sealing of the transverse edge areas according to steps iii) and iv) is clearly carried out using the sealing adhesive is arranged in the transverse edge regions that are generated from the transverse regions.

In particular, in the sequential production of tubular paper bags, the transverse regions become the first transverse edge region (see step i)) and the second transverse edge region (see step ii)) when the first transverse edge and the second transverse edge are produced by cutting off.

The first transverse edge region is spaced apart from the second transverse edge region of the tubular paper bag currently to be produced, which is why the transverse regions underlying these transverse edge regions are also spaced apart from one another.

Typically, if the paper tubular bag blank is provided as roll goods and is continuously unrolled or unwound from a roll during the process, in the sequential production of paper tubular bags, not only the second transverse edge (and thus the second one) is cut off according to step ii). Transverse edge area) of the paper tubular bag currently to be produced, but at the same time also the first transverse edge (and thus the first transverse edge area) of the next paper tubular bag to be produced. Before this cut, the successive transverse areas of the paper tubular bag blank, more precisely the paper tubular bag blank section, for the paper tubular bag currently to be produced and the next paper tubular bag to be produced are not necessarily spaced apart from one another and could also be viewed as a common - large or enlarged - transverse area which then creates the different transverse edge areas, namely the second transverse edge area of the paper tubular bag currently to be produced and the first transverse edge area of the next paper tubular bag to be produced.

To fill the respective paper tubular bag with packaged goods, the latter can already be arranged in the receiving volume before the actual production of the paper tubular bag begins, i.e. even before the paper tubular bag blank is bent into the tubular shape (which means that the receiving volume is only limited at least in sections), or during the Manufacturing process, as long as the paper tubular bag is not yet closed at both ends (in particular by sealing both the first and the second transverse edge area). Accordingly, in a preferred embodiment of the method according to the invention, it is provided that packaged goods are arranged in the receiving volume at the latest before step C) is completed, preferably already before or during step A). This means that there is great flexibility when it comes to the exact time at which the packaged goods are introduced, which in turn is favorable in view of different applications.

As already mentioned, the paper tubular bag blank can be designed as roll goods, which is favorable with regard to the, in particular sequential, production of a large number of paper tubular bags. Accordingly, in a preferred embodiment of the method according to the invention, it is provided that the paper tubular bag blank is present as rolled goods on a roll, with the base paper sheet being unrolled from the roll at least in sections before step A). A quasi-continuous transition between the removal from the roll and the bending into the tube shape is also conceivable, i.e. the section of the tubular paper bag blank or base paper sheet removed from the roll can theoretically be of almost any size before the bending begins.

According to what was said above, according to the invention there is also a paper tubular bag blank for an inventive A method for producing a paper tubular bag according to the invention is provided, comprising a bendable base paper sheet with two longitudinal edges, sealing adhesive being applied at least in one of two longitudinal edge regions having the longitudinal edges, sealing adhesive being applied in transverse regions which run transversely to the longitudinal edges and connect them to one another, wherein A flat reinforcing section is provided between the longitudinal edge regions, in which the base paper sheet is glued to a reinforcing paper sheet and at least one hole passing through the paper tubular bag blank is provided in each piece region of the reinforcing section, the respective piece region being between the longitudinal edge regions and between two transverse regions, which follow one another and are spaced apart from one another by a distance measured along the longitudinal edges, the paper tubular bag blank preferably being designed as a roll product.

BRIEF DESCRIPTION OF THE FIGURES

The invention will now be explained in more detail using an exemplary embodiment. The drawings are exemplary and are intended to explain the idea of the invention, but are in no way intended to restrict or even exhaustively represent it.

Fig. 1

eine schematische Aufsicht auf eine Unterseite einer Ausführungsform eines erfindungsgemäßen Papierschlauchbeutel-Rohlings zur Herstellung einer Ausführungsform eines erfindungsgemäßen Papierschlauchbeutels

Fig. 2

eine schematische Aufsicht auf eine Oberseite des Papierschlauchbeutel-Rohlings aus Fig. 1

Fig. 3

eine schematische Seitenansicht der Ausführungsform des erfindungsgemäßen Papierschlauchbeutels

This shows:

Fig. 1

a schematic top view of an underside of an embodiment of a paper tubular bag blank according to the invention for producing an embodiment of a paper tubular bag according to the invention

Fig. 2

a schematic view of a top side of the paper tubular bag blank Fig. 1

Fig. 3

a schematic side view of the embodiment of the paper tubular bag according to the invention

WAYS OF CARRYING OUT THE INVENTION

Fig. 1 shows a schematic top view of an underside 20 of an embodiment of a paper tubular bag blank 15 according to the invention for producing an embodiment of a paper tubular bag 1 according to the invention, the underside 20 being provided for at least partially forming an inside 22 of the paper tubular bag, cf. Fig. 3 .

The paper tubular bag blank 15 comprises a bendable base paper sheet 2, which in the illustrated embodiment has a basis weight in the range of 30 g/m ² to 50 g/m ² .

The base paper sheet 2 has two longitudinal edges 6, in one of two longitudinal edges 6 having longitudinal edge regions 8 (in Fig. 1 and Fig. 2 indicated by the dotted line) sealing adhesive 17 is applied. The sealing adhesive 17 is in Fig. 1 Longitudinal edge region 8 visible on the right side is not applied flatly, but only partially, in the form of a straight line, with the sealing adhesive 17 being arranged on the underside 20.

Furthermore, the base paper sheet has 2 transverse areas 19, 19 '(in Fig. 1 and Fig. 2 also indicated by the dotted line), which run transversely to the longitudinal edges 6 and connect them to one another. Even in the transverse areas 19, 19 ', sealing adhesive 17 is not flat, but only partially in shape applied in a straight line, with the sealing adhesive 17 being arranged on the underside 20.

In the exemplary embodiment shown, the sealing adhesive 17 is a known sealing wax.

A flat reinforcing section 11 is provided between the longitudinal edge regions 8, in which the base paper sheet 2 is glued to a reinforcing paper sheet 13, with the bonding being carried out flatly in the exemplary embodiment shown by known lamination.

In the exemplary embodiment shown, the reinforcing paper sheet 13 has a basis weight in the range of 80 g/m ² to 90 g/m ² .

The reinforcing section 11 or the reinforcing paper sheet 13 extends parallel to the longitudinal edges 6 over the entire paper tubular bag blank 15. Piece areas 16 or one piece area 16 of the reinforcing section 11 are/is limited by the transverse areas 19, 19 'or lie the piece area 16 between the transverse areas 19, 19 ', which follow one another and are spaced apart from one another by a distance measured along the longitudinal edges 6. In the exemplary embodiment shown, a plurality of circular holes 14 are provided in the piece area 16, the holes 14 completely penetrating the paper tubular bag blank 15 and correspondingly forming through openings in the paper tubular bag blank 15. Due to the mechanical reinforcement by the reinforcing paper sheet 13 glued to the base paper sheet 2, there is still no tearing in the area of the holes 14 when the paper tubular bag blank 15 or the base paper sheet 2 is bent into a tubular shape during the production of the paper tubular bag 1.

In the exemplary embodiment shown, the paper tubular bag blank 15 is designed as a roll product and is unrolled from a roll (not shown) during the production of the paper tubular bag 1, which will be explained in more detail below, and transversely to the longitudinal edges for the paper tubular bag 1 to be produced - or cut off. In this way, a large number of paper tubular bags 1 can be produced sequentially and without any problems.

In Fig. 1 and Fig. 2 , which shows a top side 21 of the paper tubular bag blank 15 opposite the bottom 20, the paper tubular bag blank 15 or the base paper sheet 2 for the production of a paper tubular bag 1 is completely unrolled and a subsequent section of the base paper sheet 2 which has not yet been completely unrolled , indicated by dashed lines. The top 21 is intended to form at least sections of an outside 23 of the paper tubular bag 1, cf. Fig. 3 . Accordingly, the reinforcing paper sheet 13 is not visible to a user on the outside 23, see also Fig. 2 .

The base paper sheet 2 extends in Fig. 1 and Fig. 2 with the longitudinal edges 6 parallel to a first direction 3 and with the transverse areas 19, 19 'parallel to a second direction 4. The first direction 3, the second direction 4 and a third direction 5 are mutually normal to one another.

Seen in the first direction 3, the base paper sheet 2 is delimited by a first transverse edge 7a, the first transverse edge 7a being arranged in a first transverse edge region 10a, which coincides with the transverse region 19 in the illustrated embodiment.

The above-mentioned cutting or cutting is carried out parallel to the second direction 4, resulting in a second transverse edge 7b is formed, which also delimits the base paper sheet 2 seen in the first direction 3 and is arranged in a second transverse edge region 10b, which in the illustrated embodiment coincides with the transverse region 19 '.

1. A) Umbiegen des Basispapierblatts 2 zu einer Schlauchform, wobei ein Aufnahmevolumen 9 zumindest abschnittsweise begrenzt wird und wobei die Längskantenbereiche 8 überlappen;
2. B) Versiegeln der Längskantenbereiche 8, typischerweise durch Erhitzen des im Längskantenbereich 8 angeordneten Siegelklebstoffs 17 und/oder durch Aufbringen von Druck auf die überlappenden Längskantenbereiche 8;
3. C) sequentielles oder gleichzeitiges Versiegeln der zwei Querbereiche 19, 19', zwischen denen der jeweilige Stückbereich 16 angeordnet ist.

To produce the paper tubular bag 1 using the paper tubular bag blank 15, the following steps are carried out according to the exemplary embodiment shown:

1. A) Bending the base paper sheet 2 into a tubular shape, with a receiving volume 9 being limited at least in sections and with the longitudinal edge regions 8 overlapping;
2. B) sealing the longitudinal edge regions 8, typically by heating the sealing adhesive 17 arranged in the longitudinal edge region 8 and/or by applying pressure to the overlapping longitudinal edge regions 8;
3. C) sequential or simultaneous sealing of the two transverse areas 19, 19 ', between which the respective piece area 16 is arranged.

1. i) falls keine erste Querkante 7a vorhanden ist, Erzeugen der ersten Querkante 7a durch Abschneiden des Basispapierblatts 2 im Querbereich 19, wobei die erste Querkante 7a im mit dem Querbereich 19 zumindest abschnittsweise überlappenden ersten Querkantenbereich 10a angeordnet ist;
2. ii) Erzeugen der zweiten Querkante 7b durch Abschneiden des Basispapierblatts 2 im Querbereich 19', wobei die zweite Querkante 7b im mit dem Querbereich 19' zumindest abschnittsweise überlappenden zweiten Querkantenbereich 10b angeordnet ist. Weiters umfasst Schritt C) gemäß dem dargestellten Ausführungsbeispiel folgende Schritte:
3. iii) Versiegeln des zweiten Querkantenbereichs 10b;
4. iv) Versiegeln des ersten Querkantenbereichs 10a,

wobei die Reihenfolge der Schritte iii) und iv) vertauschbar ist und/oder die Schritte iii) und iv) auch gleichzeitig erfolgen können.According to the exemplary embodiment shown, the following steps are carried out before step A) or after step B):

1. i) if there is no first transverse edge 7a, producing the first transverse edge 7a by cutting off the base paper sheet 2 in the transverse region 19, the first transverse edge 7a being arranged in the first transverse edge region 10a which at least partially overlaps the transverse region 19;
2. ii) Creating the second transverse edge 7b by cutting off the base paper sheet 2 in the transverse region 19', the second transverse edge 7b being arranged in the second transverse edge region 10b which at least partially overlaps the transverse region 19'. Furthermore, step C) according to the illustrated exemplary embodiment comprises the following steps:
3. iii) sealing the second transverse edge region 10b;
4. iv) sealing the first transverse edge region 10a,

where the order of steps iii) and iv) can be interchanged is and/or steps iii) and iv) can also take place simultaneously.

In the exemplary embodiment shown, packaged goods 18, which are in Fig. 3 is indicated by dashed lines and which can be, for example, vegetables in a cardboard tray, arranged in the receiving volume 9 before or during step A).

According to the illustrated embodiment, the paper tubular bag blank 15 or the base paper sheet 2 is unrolled from the roll (not shown) at least in sections before step A).

The resulting tubular paper bag 1 comprises the bendable base paper sheet 2 with the longitudinal edges 6, which extend at least in sections with a directional portion parallel to the first direction 3, as well as the first transverse edge 7a and the second transverse edge 7b, which extend at least in sections with a directional portion parallel to the second direction 4, see. Fig. 3 .

The base paper sheet 2 is bent into a tubular shape when viewed in the first direction 3 and at least partially delimits the receiving volume 9, the longitudinal edge regions 8 of the base paper sheet 2 having the longitudinal edges 6 overlapping and being sealed with one another in order to close the tubular shape as seen in a circumferential direction 12.

The first transverse edge region 10a having the first transverse edge 7a is sealed and the second transverse edge region 10b having the second transverse edge 7b is sealed in order to close the tubular paper bag 1 in the first direction 3.

The holes 14 in the reinforcement section 11 form through openings from the receiving volume 9 to the outside.

Seen in the circumferential direction 12, the reinforcing section 11 in the illustrated embodiment of the tubular paper bag 1 extends only over a limited area of the base paper sheet 2, namely in a half-space which is defined by a plane which has a longitudinal axis 24 (in Fig. 3 indicated by the dash-dotted line) of the paper tubular bag 1 contains. In the view of Fig. 3 This half-space extends upwards from the longitudinal axis 24 (in the third direction 5).

As already mentioned, in the illustrated embodiment of the tubular paper bag 1, the reinforcing paper sheet 13 is arranged inside, i.e. in the tubular paper bag 1, and is therefore not visible from the outside.

Not least due to the partial arrangement of the sealing adhesive 17 described above, its weight share in the paper tubular bag 1 according to the exemplary embodiment shown is a maximum of 3.5%. Accordingly, the paper tubular bag 1 can be easily recycled.

REFERENCE SYMBOL LIST

1

Paper tubular bag

2

Base paper sheet

3

First direction

4

Second direction

5

Third direction

6

Longitudinal edge

7a

First transverse edge

7b

Second transverse edge

8th

Longitudinal edge area

9

Recording volume

10a

First transverse edge area

10b

Second transverse edge area

11

Reinforcement section

12

Comprehensive direction

13

Reinforcement paper sheet

14

Hole

15

Paper tubular bag blank

16

piece area

17

sealing adhesive

18

Packaged goods

19, 19'

Transverse area

20

Underside of the paper tubular bag blank

21

Top of the paper tubular bag blank

22

Inside of the paper tubular bag

23

Outside of the paper tubular bag

24

Longitudinal axis of the paper tubular bag

Claims (14)

Tubular paper bag (1) comprising a bendable base paper sheet (2) with two longitudinal edges (6) which extend at least in sections with a directional portion parallel to a first direction (3), as well as a first transverse edge (7a) and a second transverse edge (7b), which are at least extend in sections with a directional component parallel to a second direction (4) and which delimit the base paper sheet (2) seen in the first direction (3), wherein the base paper sheet (2), viewed in the first direction (3), is bent into a tubular shape and delimits a receiving volume (9) at least in sections, the longitudinal edge regions (8) of the base paper sheet (2) having longitudinal edges (6) overlap and are sealed together, in order to close the tube shape as seen in a circumferential direction (12), the receiving volume (9) extending in the first direction (3), the second direction (4) and a third direction (5) and the first direction (3) , the second direction (4) and the third direction (5) are mutually normal to one another, wherein a first transverse edge region (10a) having the first transverse edge (7a) is sealed and a second transverse edge region (10b) having the second transverse edge (7b) is sealed in order to close the paper tubular bag (1) in the first direction (3), wherein the base paper sheet (2) is glued to a reinforcing paper sheet (13) in a flat reinforcing section (11) and at least one hole (14) forming a through opening from the receiving volume (9) to the outside is provided in the reinforcing section (11). Tubular paper bag (1) according to claim 1, characterized in that the reinforcing section (11), viewed in the circumferential direction (12), extends only over a limited area of the base paper sheet (2), preferably only in a half-space which is defined by a plane, which contains a longitudinal axis (24) of the paper tubular bag (1) which runs parallel to the first direction (3),
and that the reinforcing section (11), viewed in the first direction (3), extends at least in sections, preferably completely, over the base paper sheet (2). Tubular paper bag (1) according to one of claims 1 to 2, characterized in that the reinforcing paper sheet (13) is arranged in the tubular paper bag (1). Paper tubular bag (1) according to one of claims 1 to 3, characterized in that the basis weight of the base paper sheet (2) is in the range from 25 g/m ² to 60 g/m ² , preferably from 30 g/m ² to 50 g/m ² , and/or that the basis weight of the reinforcing paper sheet (13) is in the range from 20 g/m ² to 120 g/m ² , preferably from 80 g/m ² to 120 g/m ² , particularly preferably from 80 g/m ² to 90 g/m ² . Tubular paper bag (1) according to one of claims 1 to 4, characterized in that for bonding the reinforcing paper sheet (13) to the base paper sheet (2), a sealing adhesive is only partially arranged in the reinforcing section (11), in particular in the respective area around the at least one Hole (14). Tubular paper bag (1) according to one of claims 1 to 5, characterized in that a plurality of holes (14) are provided, the holes (14) preferably having different shapes and/or sizes. Paper tubular bag (1) according to one of claims 1 to 6, characterized in that for sealing the longitudinal edge regions (8), a sealing adhesive (17) is provided in at least one of the longitudinal edge regions (8), the sealing adhesive (17) being in the respective longitudinal edge region (8 ) is only partially arranged. Tubular paper bag (1) according to one of claims 1 to 7, characterized in that a sealing adhesive (17) is provided to seal the first transverse edge region (10a) and the second transverse edge region (10b), which is only partially in the respective transverse edge region (10a, 10b). is arranged. Tubular paper bag (1) according to one of claims 1 to 8, characterized in that for the bonding of the base paper sheet (1) to the reinforcing paper sheet (13) and for the sealing of the longitudinal edge regions (8), the first transverse edge region (10a) and the second transverse edge region (10b) sealing adhesive (17) is provided, the weight proportion of the sealing adhesive (17) on the paper tubular bag (1) being a maximum of 5%, preferably a maximum of 3.5%. Method for producing a paper tubular bag (1) according to one of claims 1 to 9, using a paper tubular bag blank (15) comprising a bendable base paper sheet (2) with two longitudinal edges (6), sealing adhesive (17) being applied at least in one of two longitudinal edge regions (8) having the longitudinal edges (6), wherein sealing adhesive is applied in transverse areas (19, 19'; 10a, 10b), which run transversely to the longitudinal edges (6) and connect them to one another, wherein a flat reinforcing section (11) is provided between the longitudinal edge regions (8), in which the Base paper sheet (2) is glued to a reinforcing paper sheet (13) and at least one hole (14) passing through the paper tubular bag blank (15) is provided in each piece area (16) of the reinforcing section (11), the respective piece area (16 ) between the longitudinal edge regions (8) and between two transverse regions (19, 19 '; 10a, 10b), which follow one another and are spaced apart from one another by a distance measured along the longitudinal edges (6), the method comprising the following steps: A) bending the base paper sheet (2) into a tubular shape, with a receiving volume (9) being limited at least in sections and with the longitudinal edge regions (8) overlapping; B) sealing the longitudinal edge areas (8); C) sequential or simultaneous sealing of the two transverse areas (19, 19'; 10a, 10b) between which the piece area (16) is arranged. Method according to claim 10, characterized in that the following steps are carried out before step A) or after step B): i) if there is no first transverse edge (7a), creating a first transverse edge (7a) by cutting off the base paper sheet (2) in one of the transverse areas (19), the first transverse edge (7a) being in one with the transverse area (19) at least the first transverse edge region (10a) is arranged to overlap in sections; ii) producing a second transverse edge (7b) by cutting off the base paper sheet (2) in that of the transverse regions (19') which follows the first transverse edge region (10a), the second transverse edge (7b) being in one with that transverse region (19' ) at least partially overlapping second transverse edge region (10b) is arranged; and that the method in step C) comprises the following steps: iii) sealing the second transverse edge region (10b); iv) sealing the first transverse edge area (10a), wherein the order of steps iii) and iv) can be interchanged and/or steps iii) and iv) can also take place simultaneously. Method according to one of claims 10 to 11, characterized in that packaged goods (18) are arranged in the receiving volume (9) at the latest before step C) is completed, preferably already before or during step A). Method according to one of claims 10 to 11, characterized in that the paper tubular bag blank (15) is present as rolled goods on a roll, the base paper sheet (2) being unrolled from the roll at least in sections before step A). Paper tubular bag blank (15) for a method according to one of claims 10 to 13 for producing a paper tubular bag (1) according to one of claims 1 to 9, comprising a bendable base paper sheet (2) with two longitudinal edges (6), at least in one of Sealing adhesive (17) is applied to two longitudinal edge regions (8) having the longitudinal edges (6), wherein sealing adhesive (17) is applied in transverse areas (19, 19'; 10a, 10b), which run transversely to the longitudinal edges (6) and connect them to one another, wherein a flat reinforcing section (11) is provided between the longitudinal edge regions (8), in which the base paper sheet (2) is glued to a reinforcing paper sheet (13) and at least one hole (14) passing through the paper tubular bag blank (15) in each a piece area (16) of the Reinforcing section (11) is provided, the respective piece area (16) between the longitudinal edge areas (8) and between two transverse areas (19, 19 '; 10a, 10b), which follow one another and from each other at a distance measured along the longitudinal edges (6). are spaced apart, is arranged, wherein the paper tubular bag blank (15) is preferably designed as a roll product.

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