EP4416333A1

EP4416333A1 - Packaging material made of unbleached kraft paper, sleeve produced therefrom, and method for manufacturing same

Info

Publication number: EP4416333A1
Application number: EP22801478.3A
Authority: EP
Inventors: Elisabeth SCHWAIGER; Alexander Fink; Kent GUSTAFSSON; Patrik SILVÈN
Original assignee: Mondi AG
Current assignee: Mondi AG
Priority date: 2021-10-13
Filing date: 2022-10-13
Publication date: 2024-08-21
Also published as: WO2023062134A1; CA3234736A1

Abstract

The invention relates to a packaging material (1) consisting of an unbleached kraft paper having a Kappa number according to ISO 302:2015 of between 38 and 60 as a base paper, wherein: - the kraft paper is manufactured from at least 90% primary cellulose and has a grammage according to ISO 536:2019 of between 65 g/m² and 170 g/m²; - furthermore, the kraft paper contains at least 90% primary cellulose, containing at least 80% cellulose with a length-weighted mean fiber length according to ISO 16065-2:2014 of between 2.0 mm and 2.9 mm, and less than 5% fillers as well as cationic starch and other process aids; - the primary cellulose is present in the form of beaten cellulose, more particularly cellulose beaten with high consistency, having a Schopper-Riegler degree of beating according to ISO 5267-1:1999 of between 13 °SR and 20 °SR; - the packaging material has a strain ratio MD/CD of the kraft paper at break according to ISO 1924-3:2005 of > 1.1, a tear length in the machine direction according to ISO 1924-3:2005 of >10 km, and a tear index in the cross direction of the kraft paper according to ISO 1974:2012 of > 16.0 mN·m²/g; - the kraft paper is optionally coated, at least on one side, with a coating material. The invention also relates to a method for manufacturing the packaging material, to a sleeve produced from the packaging material, and to a use of the packaging material.

Description

PACKAGING MATERIAL OF UNBLEACHED KRAFT PAPER, BANDEROL THEREOF AND PROCESS FOR THEIR MANUFACTURE

The present invention relates to a packaging material consisting of an unbleached kraft paper with a kappa value according to ISO 302:2015 between 38 and 60, preferably between 40 and 58 as the base material, the kraft paper being made from at least 90% primary cellulose and has a basis weight according to ISO 536:2019 between 65 g/m ² and 170 g/m ² , as well as a banderole made from such a packaging material, a method for producing the same, and a banderole made from such a packaging material and on the use of the packaging material.

Unbleached kraft paper is widely used as a packaging material because of its high resistance to tearing and. moreover, it also has good stability to exposure to moisture and chemicals. Kraft paper is also easily printable, regardless of whether it is bleached or unbleached, so that a consumer of the packaged goods can see the necessary information printed directly on the packaging. A typical application of kraft paper and in particular unbleached kraft paper is its use in the manufacture of sacks for packaging a wide variety of materials, such as building materials, sharp-edged materials, food, toys or the like. In the packaging sector, however, not only the shape exists the packaging, in which the goods to be packaged are completely wrapped in the packaging paper, such as bags closed on all sides, but it is often possible to simply surround goods to be packaged or goods to be sold in bundles with a kind of loop, on which information About the content, possibly the shelf life or the like., Brand names are often printed. Such loops are often also used to hold together a number of similar or different related goods to be packaged packed by surrounding it with a bow or banderole. It is essential for the packaging material from which such a loop is made that it tightly encloses the goods to be packaged or enclosed so that the loop cannot be pulled down unintentionally and one or more of the products surrounded by the loop do not fall out can or can and furthermore it is guaranteed that the goods to be surrounded by the loop can be inserted into it without damage on the one hand and on the other hand with such an insertion or also a subsequent one transport, handling or the like. the loop surrounding the goods is not torn or damaged in any other way.

In the same way, it is often necessary to provide tubular packaging materials in which compressible or resilient objects must be packaged in their most compressed form, on the one hand, in order to keep the space required for this packaging as small as possible and, on the other hand, to guarantee this that the packaged goods are not compressed and decompressed unnecessarily often during transport, which could lead to material fatigue. In this context, it seems particularly important that the packaging material is not stressed beyond its stretching capacity by the tensile stress exerted by the resilient goods packed in it and tears, or else the tubular packaging material is not damaged when the goods to be packed are inserted becomes. Plastic foils or tapes, which can be produced in different configurations and can also be produced adapted to the respective requirements, have been considered to be best suited for this to date. For environmental reasons, efforts are being made to replace plastic packaging as far as possible with packaging made from materials made from renewable raw materials and, in particular, from biodegradable raw materials. Recently, there has been increased research into producing special papers, in particular kraft papers, which meet a wide variety of requirements in terms of durability, stretchability, moisture resistance and the like in order to replace plastic packaging. Here, in particular in cases where ring-shaped closed tubes, tapes or loops have to be used as packaging materials, there is the problem that packaging made of paper, for example, is produced from a flat paper web, which web is glued to form the ring or tube or otherwise in must be sealed in some way. If this closure is closed or formed only after the goods to be packaged have been inserted into it, the time required for a formed splice to harden or dry or for a thermoplastic to harden may be too high for mass production, so that analogous to plastic packaging, it is necessary to form this tube, ring or loop before inserting the products to be surrounded by it. So that products can be inserted into such a tube, ring or loop or into such a band without destroying the same or even the same, such a packaging material or packaging paper must not only have excellent elasticity in the radial direction, ie in the circumferential direction of the ring or bow, but must also not tear at the edges, especially when inserting the objects. The present invention therefore aims to provide a packaging material made from an unbleached, optionally coated kraft paper which does not tear in either the machine direction or the cross-machine direction under great stress, in particular a stress that stretches the paper, and is sufficiently elastic or elastic over time. remains resilient so that the objects packed in it cannot fall out even after a long period of time due to a loss of tension or elasticity in the packaging material.

To solve this problem, the packaging material according to the invention is essentially characterized in that the kraft paper contains at least 90% primary cellulose, containing at least 80%, preferably at least 85%, in particular at least 88% cellulose with an average length-weighted fiber length according to ISO 16065-2:2014 between 2 0 mm and 2.9 mm and less than 5%, preferably less than 4.5%, in particular less than 4.2% fillers and cationic starch and other processing aids that the primary pulp as ground, especially high-consistency ground pulp with a freeness according to Schopper-Riegler according to ISO 5267-1: 1999 between 13 °SR and 20 °SR is included that there is an elongation at break ratio MD/CD of the kraft paper according to ISO 1924-3:2005 of >1.1, a tear length in the machine direction according to ISO 1924-3:2005 of >10 km, that a tear propagation resistance index in the transverse direction of the kraft paper according to ISO 1974:2012 of >16.0 mN.m ² /g and that the kraft paper optionally has at least one side with coated with a coating material.

Because the packaging material is at least 90% primary pulp, containing at least 80%, preferably at least 85%, in particular at least 88% pulp with an average length-weighted fiber length according to ISO 16065-2:2014 between 2.0 mm and 2.9 mm and less than 5%, preferably less than 4.5%, in particular less than 4.2% fillers and cationic starch and other processing aids, it is possible to provide an unbleached kraft paper with an extremely tear-resistant structure and in particular because of the narrow Length distribution of the fiber lengths of the primary pulp used to achieve excellent, homogeneous paper properties both in the machine direction and in the cross direction. Such an unbleached kraft paper can also be used safely and reliably for the packaging of sharp-edged objects or heavy materials such as cement or beverage bottles because of its resilience and its possibility of being (micro)creped in a Clupak line. By also containing less than 5%, preferably less than 4.5%, in particular less than 4.2% (in the context of the present invention, the percentages given are always to be understood as percentages by weight) of fillers and cationic starch and processing aids it to obtain at the same time a strong but not overly stiff unbleached kraft paper, in which high percentages of starch, in particular cationic starch, can be used due to the lignin and hemicelluloses remaining in the kraft paper and the associated high numbers of negative charges. Since an unbleached kraft paper produced in this way is not excessively stiff but is extremely stretchable, it is possible, particularly when bows, ribbons, banderoles or tubes are produced from this packaging material, to securely and reliably enclose the objects packed in it without that it must be feared that these slip out of the packaging material in an unintentional manner, whereby in the manufacture of such tubes, tapes or loops it must be ensured that the unbleached kraft paper has greater elasticity in the winding direction of the loop than in the transverse direction of the loop. By designing the packaging material in such a way that the primary cellulose is contained as ground, in particular high-consistency ground cellulose with a Schopper-Riegler freeness according to ISO 5267-1:1999 of between 13°SR and 20°SR, it is still possible existing fiber agglomerates, such as stripping and splinters, can be broken up, as a result of which a uniform sheet or particularly homogeneous kraft paper can be formed in which an optimized combination of fiber flexibility and tear propagation resistance index in the transverse direction can be achieved. Needless to say, both the breaking length and the air permeability of the paper can be adjusted by high or low consistency grinding of paper, although the latter is not important in the present case, especially if coatings are optionally applied, since neither rapid filling of closed sacks from the packaging material according to the present invention is to be achieved, nor does the air permeability in any other way bring about advantageous or negative properties for packaging made from the packaging material.

The packaging material can also consist of 100% primary cellulose. Because the packaging material, in particular the unbleached kraft paper, consists of 100% primary cellulose, it is possible to reliably avoid negative influences on the end product, which for example originate from recycled cellulose or from cellulose obtained from waste paper, and in particular a reduced strength or elongation at break of the packaging material, which is usually caused by waste paper or recycled pulp, can be avoided. In connection with the present invention, it is essential that the elongation at break or the elongation at break ratio, the breaking length in the machine direction and the tear propagation resistance index in the transverse direction can be kept high and as constant as possible over time in order to have consistent material properties with which it is possible to produce tubular packaging or bands or loops in which heavy or sharp-edged objects can also be packed and/or wrapped with them. can be wound and stored for a long period of time without the risk of tearing or tearing of the unbleached kraft paper or deterioration of the packaging produced with it.

The fact that the unbleached kraft paper of the packaging material has an elongation at break ratio MD/CD according to ISO 1974:2012 of > 1.1 ensures that its stretchability in the machine direction (MD) is greater than that in the transverse direction and the packaging material is therefore not only in the MD and CD is extensible, but can be subjected to a greater change in length in one direction than in the other without having to fear destruction, in particular tearing, of the packaging material.

Because the MD/CD elongation at break ratio of the kraft paper according to ISO 1974:2012 is > 1.1, it is further ensured that even objects that do not have a homogeneous or even and smooth surface can be packed safely and reliably in this packaging material based on unbleached, optionally coated kraft paper, since the paper, essentially after it has returned to its original shape from its expanded shape caused by the insertion of the goods, tightly encloses the packaged goods on all sides and is also able to securely hold goods with uneven surfaces and keep it reliable. At the same time, the elongation is sufficiently large so that the products can be inserted into the packaging material without damaging it, in particular into tubular sleeves formed from this optionally coated paper or packaging material Materials and stretching of the same is returned to its original shape and tightly encloses the packaged objects, so that there is no risk of packaged objects falling out of, for example, tubular or ring-shaped packaging from the packaging material according to the invention. Furthermore, it has been shown that with an elongation at break ratio MD/CD of the kraft paper according to ISO 1974:2012 of >3, no further improvement in the properties of the packaging material required for packaging heavy objects can be achieved.

The fact that the tearing length in the machine direction of the kraft paper is > 10 km according to ISO 1924-3:2005 also ensures that the machine strength in the longitudinal direction of the packaging material is so great that, for example, tubular or ring-shaped packaging was made of it , even non-flexible objects can be inserted into the interior of this packaging material shaped in this way without fear of accidental tearing of the kraft paper. By continuing to If the tear propagation resistance index in the transverse direction of the kraft paper according to ISO 1974:2012 is > 16.0 mN.m ² /g, it is guaranteed that a free edge of the packaging material will not tear, even in the event of unintentionally high loads on the edge of the packaging material and Especially when tubular or ring-shaped products are made of this packaging material, such as loops or banderoles, when inserting the goods to be packaged, there is no risk of the packaging material tearing and thus destroying the packaging.

By designing the packaging material in such a way that a tear propagation resistance index in the transverse direction (CD) of the kraft paper according to ISO 1974:2012 is > 16.0 mN.m ² /g, the packaging material consisting essentially of unbleached, optionally coated kraft paper can also be used be subjected to heavy stress at its edges without fear of the paper tearing or tearing further from the edge to the middle. Finally, this can prevent even a small tear from forming in the packaging material from unintentionally enlarging.

In connection with the present invention, the term “packaging material” is understood to mean essentially unbleached kraft paper, which can optionally be coated on one or both sides. Furthermore, it may have one or more plies of the kraft paper.

According to a development, the packaging material can also consist of 100% primary cellulose. Because the packaging material, in particular the unbleached kraft paper, consists of 100% primary cellulose, it is possible to avoid negative influences on the end product, for example from recycled cellulose or from cellulose obtained from waste paper, even more reliably and in particular In this way, reduced strength or elongation at break of the packaging material, which is usually caused by waste paper or recycled cellulose, can be avoided. In connection with the present invention, it is essential that in particular the elongation at break or the elongation at break ratio, the breaking length in the machine direction and the tear propagation resistance index in the transverse direction can be kept high and as constant as possible over time in order to provide consistent material properties with which it is possible to produce tubular or ring-shaped packaging or bands in which heavy or sharp-edged objects can also be packed and/or wrapped and stored for a long period of time without tearing or tearing of the unbleached Kraft paper and a deterioration of the packaging produced with it is to be feared. This is achieved by designing the packaging material in such a way that it has a starch content of 0.5% to 2.2% of the kraft paper, in particular 0.7% to 2.0%, as corresponds to a development of the invention the excellent mechanical properties of the unbleached kraft paper, keeping the surface smoothness of at least one side of the kraft paper high and keeping the Bendtsen roughness low, thus providing excellent printability of this at least one side of the packaging material. In the present context, an attempt is simultaneously made to make only one side, in particular the side facing away from the machine or "top side" of the paper, correspondingly smooth, in order to ensure adhesion to the inside of tubular or ring-shaped packaging, ie that of the "top side side facing away from the packaging material according to the present invention as large as possible in order to prevent the objects packed in it from slipping out as far as possible.

According to a further development of the invention, the packaging material is designed in such a way that the primary pulp consists of a mixture consisting of at least 80% softwood pulp, preferably at least 90% softwood pulp, in particular at least 95% softwood pulp with an average length-weighted fiber length according to ISO 16065-2:2014 of at least 2.0 mm, preferably at least 2.2 mm and the remainder consists of hardwood pulp with an average length-weighted fiber length according to ISO 16065-2:2014 of at least 1.0 mm. The predominant amount of softwood pulp with an average length-weighted fiber length according to ISO 16065-2:2014 of at least 2.0 mm and the remainder hardwood pulp with an average length-weighted fiber length according to ISO 16065-2:2014 of at least 1.0 mm can through The softwood pulp has a positive effect on the strength properties and the hardwood pulp has a positive effect on the smoothness of at least one side of the unbleached kraft paper, and a targeted choice of the pulp composition can produce a packaging material with both excellent mechanical properties, in particular the elongation at break ratio, and sufficient smoothness which provides good printability can be provided. Furthermore, with such a selection of the pulp mixture, in particular the high content of softwood pulp, it can be ensured that an unbleached packaging material produced in this way has a large tearing length in the machine direction, as a result of which a particularly resilient packaging material can be provided in which objects can also be stored can be packaged with a higher weight without the packaging necessarily having to have a bottom and/or top surface.

By, as corresponds to a development of the invention, the packaging material is designed in such a way that it has a tensile strength index in the machine direction according to ISO 1924:3: 2005 of >105 Nm/g, preferably at least 115 Nm/g, a non-destructive Ver - pack of heavy or sharp-edged objects in the packaging material guaranteed according to the present invention. The tensile strength index according to the invention in the machine direction also ensures that, when producing, for example, tubular packaging or loop-shaped or banderole-shaped packaging from the packaging material according to the invention, it is possible to provide the packaging material with sufficient resilience, which means that even heavy ones can be fitted Objects in such a loop or banderole made of the packaging material is certainly possible and, moreover, tearing of the material is not to be feared.

In the same way, as corresponds to a development of the invention, the packaging material has a TEA index in the machine longitudinal direction according to ISO 1924-3:2005 greater than 5.0 J/g, preferably greater than 5.5 J/g. Because the TEA index in the machine length direction is greater than 5.0 J/g, it is possible to provide a packaging material that is extremely elastic and extensible without the packaging material tearing. The TEA index is understood as meaning the tensile rupture work index (“Tensible Energy Absorption Index”) in accordance with ISO 1924-3:2005.

In order to prevent the packaging material according to the invention from tearing or bursting open from the edges to the middle, the invention is further developed in such a way that the packaging material has a bursting strength according to 1802758:2014 of greater than 750 kPa, preferably greater than 770 kPa, particularly preferably greater than 800 kPa. According to the invention, the bursting strength is adjusted or increased, inter alia, by a combination of the following measures: use of pulp from softwood, a low filler content and a high proportion of, for example, cationic starch. Furthermore, grinding, in particular low-consistency grinding, also has a positive influence on the bursting strength.

Since, as corresponds to a development of the invention, the packaging material is designed in such a way that it has a wet strength index according to ISO 3781:2011 in the machine direction of the kraft paper of at least 14.0 Nm/g, in particular 14.5 Nm/g, particularly preferably at least 15.0 Nm/g, the packaging material makes it possible in particular to provide tubular or ring-shaped packaging which is also suitable for use in a humid environment. Particularly when, for example, food packaging or loops, which surround and hold together a plurality of foodstuffs or foodstuffs, are produced from the packaging material, contact with condensation water, moisture or a damp environment cannot be avoided, so that a high - he wet strength or a high wet strength index, but without permanent wet strength agents or large quantities thereof, in the manufacture of the packaging material consisting essentially of unbleached kraft paper is desirable. The wet strength index according to ISO 3781:2011 in the machine direction can be further improved by providing the packaging material with a coating on one or both sides.

Surprisingly, such a high wet strength can also be achieved with a high dry base strength with the packaging material according to the present invention. In order to achieve high wet strength, it is usually necessary to use larger amounts of auxiliary materials, such as wet strength agents, which in turn cause problems when the packaging material to be produced, which essentially consists of unbleached kraft paper, causes problems. Since the dry strength in the packaging material according to the invention consisting essentially of unbleached kraft paper is >105 Nm/g, expressed by the tensile strength index in the machine direction, sufficient wet strength can surprisingly be achieved very resource-efficiently without or only by adding very small amounts can be achieved with wet strength agents.

In the present case, wet strength agents are understood to be water-miscible polymer solutions in the processing state, which are primarily produced from polyamines and epichlorohydrin derivatives. Products based on urea-formaldehyde or melamine-formaldehyde are also conceivable as wet strength agents, but these are preferably no longer used for reasons of avoiding health risks. When the wet strength agents react with cellulose fibers, cross-linking forms between the fibers, which leads to increased water resistance of the corresponding paper produced in this way. However, the hydrophobic linkage formed in this way prevents a simple or successful recycling of a paper treated with these wet strength agents. Returning used packaging paper to a pulp cycle is therefore not possible or only possible to a limited extent through the use of high temperatures and/or additional chemicals and additives. It is therefore desirable to keep the amount of wet strength agents used as low as possible, which is surprisingly achievable with a kraft paper or packaging material according to the invention.

According to a further development of the invention, the packaging material is designed in such a way that a coating material selected from a polyolefin is applied to at least one side in an amount which corresponds to 1/15 to 1/6 of the weight per unit area of the kraft paper. By having a coating material selected from a polyolefin or polylactic acid (PLA) on at least one side of the packaging material, in an amount corresponding to 1/15 to 1/6 of the weight per unit area of the kraft contained in or forming the packaging material. paper, it is possible on the one hand to further improve the wet strength of the packaging material without impairing the excellent mechanical properties. On the other hand, by applying such small amounts of a coating material to at least one side of the packaging material, it can be ensured that loops, rings, hoses, banderoles or the like can be formed from the packaging material by overlapping free end areas of the packaging material and a closed ring can be formed by heat sealing the at least one thermoplastic polyolefin layer or the polylactic acid layer.

Finally, by applying an amount corresponding to 1/15 to 1/6 of the basis weight of the kraft paper to a polyolefin coating material or polylactic acid coating material, it can be ensured that a packaging material produced in this way is both decomposable and, due to the small amount of polymer, is not harmful to the environment .

By selecting the polyolefin from high-density polyethylene (HDPE), low-density polyethylene (LDPE) or polypropylene (PP), as corresponds to a development of the invention, both stable and mechanical properties can form the basis of the packaging material Coatings that do not impair kraft paper are formed. Polyolefin coating materials with densities in the range from 900 to 950 kg/m ³ and softening or melting temperatures between 125 and 150° C. have proven to be particularly well suited here.

According to a development of the invention, the packaging material is developed in such a way that it forms a laminate consisting of several layers of kraft paper and several layers of the coating material. By forming a laminate from several layers of kraft paper and several layers of the coating material, it is possible to provide both resilient and extremely resilient packaging materials. Such packaging materials can be used, for example, as packaging tapes, in particular as a substitute for plastic tapes enclosing packages, packaging or the like. In addition, such laminates can not only be used on existing industrial packaging machines, but due to the particularly high tear strength of the laminate, it can also be stapled without the staples tearing out or the laminate tearing due to the material weakening must be feared, By, as corresponds to a development of the invention, the laminate having at most 5 layers of kraft paper, such as 4 plies, more advantageously 3 plies, preferably 2 plies, of kraft paper and at most 6 plies of the coating material, such as 5 plies, more advantageously 4 plies, preferably 3 Having layers of the coating material, it is possible on the one hand to produce laminates that are optimally adapted to the thickness requirements of industrial packaging machines. On the other hand, a large number of different ribbons, banderoles, loops or the like can be produced from the laminate using a single grammage of kraft paper, which in particular reduces downtimes and necessary adjustments to the paper machine. As a result, the kraft paper constituting the basis of the packaging material can be manufactured more economically.

According to a development of the invention, each layer of the coating material located between two layers of kraft paper has an amount which corresponds to 1/15 to 1/9 of the basis weight of the kraft paper, and a layer of the coating material forming an outside of the laminate has an amount which corresponds to 1/11 to 1/6 of the basis weight of the kraft paper. With such a design, the amount of coating material used can be minimized, since each layer of coating material located between two layers of kraft paper only has to ensure that the two layers of kraft paper hold together and can therefore be formed from a smaller amount of coating material. In contrast, each outer layer of the coating material must be strong enough. that it must ensure a secure and durable heat seal of, for example, two ends of the packaging material.

The invention also aims to form or provide a banderole from the packaging material according to the present invention, with which banderole it is possible to pack or enclose a plurality of heavy, non-connected products and to transport them without there is a risk of the packaging material tearing.

To solve this problem, according to the invention, a banderole made of the packaging material of the present invention is provided which is designed in such a way that it consists of a closed, in particular crimped, glued, preferably double glued, welded, stapled, sewn or riveted im Essentially made of unbleached kraft paper, optionally coated, at least one-ply web of packaging material is formed, and that a machine direction of the paper web in the packaging material forms a circumferential direction of the banderole. Due to the fact that the glued, in the transverse direction of a closed, in particular crimped, preferably doubly glued, welded, stapled, sewn or riveted, optionally coated, at least one-ply web of packaging material made essentially of unbleached kraft paper, it is possible to expand the greater elongation that the unbleached kraft paper has in the machine direction in the circumferential direction of the banderole, of the tape, the loop or the tubular packaging, so that due to the excellent stretchability of the packaging material in the machine direction, even a large number of objects when inserted into the banderole or into the packaging material glued to form a ring, the packaging material does not tear or tear .further tearing. Since this makes it possible to enclose a plurality of objects with the band, it goes without saying that a number of objects that are the same or different can be enclosed and held together without having to provide packaging that completely encloses the objects. Since the packaging material is arranged in the finished banderole in such a way that a machine direction of the packaging material forms a circumferential direction of the banderole, the expansion properties in the machine direction brought about by the manufacturing process of the packaging material can be used to ensure that products to be packed or wrapped Closing objects can be introduced into a banderole that has already been glued to form a ring, utilizing the expansion properties of the packaging material, without fear of the banderole tearing and are held firmly in this ring after insertion due to the resilience of the packaging material. Furthermore, a tape formed from this packaging material, in particular a laminate made from this packaging material, can also be used instead of plastic tapes, which are used, for example, to seal packages, to protect objects from loss and the like.

By connecting the packaging material to form a ring or a loop or banderole in such a way that it encloses a plurality of objects in the machine direction of the paper web, it is also possible to insert the plurality of objects into such a banderole without tearing of the banderole in the transverse direction as well as longitudinally, nor at the edges of the banderole is to be feared. Moreover, it goes without saying that such a banderole represents an extremely paper-saving type of packaging with which objects can be packaged and held together securely and reliably.

The fact that the banderole encloses at least two identical or different objects ensures that bundles of any size can be formed, which at the same time, due to the elongation at break ratio MD/CD of the optionally coated kraft paper according to ISO 1924-3:2005 of >1 ,1 to about 3 and the further tear resistance index in the transverse direction according to ISO 1974:2012 of > 16.0 mN.m ² /g can be reliably inserted into the banderole or the tubular product without the risk of the edges of the paper tearing or tearing out. Such a banderole can also be used to package heavy objects or objects that are long or tall compared to the width of the banderole, without there being any risk of the banderole tipping over and subsequently tearing. This is because, due to the material properties of the packaging material, the objects can be tightly enclosed and therefore tearing and subsequent tearing of the banderole is not to be feared even if one or more objects tilt over. A banderole of this type can also be used to seal a box or the like, for example.

The banderole can be designed in such a way that the plurality of objects are arranged in the banderole in several rows, in a circle or forming a dense pack. With such an arrangement of the enclosed objects, for example, conventional beverage packs comprising two, six or even twelve bottles can be surrounded by a band according to the invention, or food products such as zucchini or bananas can be arranged in a band or, for example, several mutually identical foam elements, such as foam cushions or rods made of metal or wood, can be arranged inside such a banderole.

According to a further development of the invention, the banderole is designed in such a way that it is subject to tensile stress from the enclosed objects, in particular with a tensile stress that is less than an elongation at break in the machine direction (MD) measured according to ISO 1924-3:2005 of the optionally coated paper web , is charged. The tensile load or tensile stress on the objects packaged inside such a band ensures that an object does not unintentionally fall out of the band, as a result of which the hold of the remaining products could no longer be guaranteed.

In order to provide sufficient stretchability of the packaging material or also to be able to provide sufficient resilience of the same, the packaging material is essentially designed in such a way that the elongation at break in the machine direction (MD), measured according to ISO 1924-3:2005, of the paper web is > 8 % is. Kraft papers, which have an elongation at break of the paper web of >8% in the machine direction, have proven themselves in standard packaging materials, such as heavy-duty bags and the like, which are subjected to heavy loads in MD, and surprisingly it could be shown that from a Banderoles made of such material are able to hold the products packed in them safely and reliably due to the excellent resilience of this material, without fear of the products slipping or falling out of the banderole or tearing or tearing of the banderole when the banderole is inserted products is to be feared.

According to a development of the invention, the banderole, the band or the like is designed in such a way that it consists of a laminate consisting of several layers of kraft paper and several layers of the coating material, such as a maximum of 5 layers of kraft paper, for example 4 Layers, more favorably 3 layers, preferably 2 layers of the kraft paper and at most 6 layers of the coating material, such as 5 layers, more favorably 4 layers, preferably 3 layers of the coating material. By using a laminate, the banderole, ribbon or loop can be used as a replacement for conventional plastic ribbons without the fear of the laminate tearing. Unintentional detachment of a joint between two ends of the laminate is also prevented with certainty, regardless of whether the band or banderole is heat-sealed, stapled, crimped or connected to one another in any other way.

A further object of the present invention is to provide a method for forming a band from the packaging material according to the invention, whereby due to the conventional production methods, the problem essentially lies in the fact that a paper web has, in principle, greater elongation properties in the machine direction than through appropriate treatments in transverse direction. Although isotropic papers are already known which have the same properties in the longitudinal and transverse directions, these can only be produced to a limited extent on large paper machines and, in particular, these papers usually have at least slightly poorer properties in the transverse direction.

In order to be able to optimally utilize the favorable properties of the packaging material according to the invention with a banderole, the method according to the invention is designed in such a way that from a web of packaging material essentially consisting of unbleached kraft paper unrolled in the machine longitudinal direction, a length of the packaging material is cut off, the cut length of packaging material is pivoted through 90°, those two free edges of the cut length, which run in the machine cross direction when the web of packaging material is unwound, are folded over one another and closed to form a tube and that one of the closed tube A plurality of bands are separated or prepared for separation, in particular perforated, scored or marked. Due to the non-existent possibility or economic pointlessness, on To make cuts or a large number of cuts in the paper in a paper machine in the longitudinal direction of the machine in an unwinding paper web, the process is essentially carried out in such a way that a length of packaging material is first cut off from an unrolling web of packaging material, which length in Essentially corresponds to the scope of a banderole to be produced. In this case, of course, a certain excess length can be provided, which must be present as an overlap of the material when the layer of packaging material is subsequently closed to form a tube or, if appropriate, a single banderole. After cutting off the appropriate length, a tube can either be formed directly from the cut length, with the paper then being folded in such a way that the transverse direction, ie the width of the web of packaging material, forms the circumferential length of the tube, or directly the cut piece of packaging material can be turned by 90° and then glued, crimped, riveted, sewn or the like to form a tube. In a last step, it is now necessary to separate appropriate pieces, which correspond to the width of the banderole, from the tube formed in this way. The detachment can be done by cutting, punching, tearing off and the like, for which purpose either perforations, marking lines, pre-punched areas or the like can be carried out beforehand, with this being carried out either directly or at the end customer depending on the purpose and end use of the banderole is made. It makes sense that those pieces that form a large number of bands are not separated beforehand, since, for example, printing is in principle easier if larger areas can be correspondingly printed at the same time.

According to a further development of the method according to the invention, the method can be carried out in such a way that the pivoting of the cut length of the packaging material by 90” before or after folding over one another and sealing those two free edges of the cut length which occur when the web of packaging material is unwound running in the cross-machine direction. As stated, it is irrelevant here whether the pivoting of the cut length of the packaging material by 90° is carried out before or after the two free bands of the cut length are folded over one another in order to close them.

The packaging material according to the invention can, as corresponds to a development of the invention, be used as a banderole or as a band, although it should be mentioned that conventional sacks and the like can of course also be made from this packaging material which, however, only makes sense for high-performance products due to the special material properties. The invention is explained in more detail below using exemplary embodiments and drawings. In these show:

1 shows a schematic representation of possible types of connection of a packaging material according to the invention to a banderole or loop; and

2 shows a schematic representation of the process sequence for producing a banderole from the packaging material according to the invention.

In detail, FIG. 1a) schematically shows a band or loop 1, which band 1 is designed such that two free ends 2, 3 of the packaging material forming the band 1 overlap and in the area of the overlap 4 at least one connection is formed.

With such a packaging material, which is designed in particular as a loop or banderole, it is thus possible to hold a plurality of objects designed identically or differently to one another by the banderole 1 without, for example, an additional plastic packaging extending over the entire pack of items must be used. The area of the connection 4 can have any type of connection, such as surface bonding (see Fig. 1b)), spot-type bonding (see Fig. 1c)), or any type of connection, such as sewing (see Fig Id)), crimping, large-area gluing or thermal sealing or the like can be used. A banderole designed in this way is then pulled over the objects to be held together, as a result of which these are tightly and firmly held together due to the resilience of the material.

1b) shows a perspective longitudinal view of an endless tube formed from the packaging material according to the invention, which endless tube is intended for the formation of a plurality of banderoles 1. In the embodiment shown in FIG. 1b), the free ends 2, 3 of the packaging material are again arranged so that they overlap and the connection area 4 is glued over the entire surface, as shown by a dashed area. The dashed lines 11 in FIG.

In Fig. 1c) is a representation of an endless tube made of the packaging material according to the invention in a manner analogous to that shown in Fig. 1b), wherein instead of full-surface gluing in the overlapping area 4 punctiform gluing points, which in particular are divided into two arranged in other staggered rows. Needless to say, any other type of gluing can of course be selected, be it in two individual gluing lines, one gluing line or the like. If a packaging material coated on one or two sides is used, the adhesive bond can preferably be achieved by thermal sealing or welding of the coating made of a thermoplastic.

In Fig. 1d), in which a representation as in Fig. 1b) of the packaging material according to the invention was also selected, it is shown that the free ends 2, 3 of the packaging material forming the endless tube are connected to a second layer of the packaging material - Rials 8 are sewn, as indicated schematically by the seam lines 6.

With such banderoles 1 it is now possible to pack a wide variety of objects together so that they cannot be lost and in particular to ensure that even when heavy objects such as metal rods or the like are packed, tearing of the packaging material 8 is avoided. If such a banderole 1 is pulled over objects to be packaged, in particular heavy or hard objects, the resilience of the unbleached kraft paper forming it, in particular through its elongation at break, tensile strength or also the tear propagation resistance index, makes it possible to ensure that if a small tear occurs in packaging material 8, which forms the banderole 1, should not have been formed, it does not tear further and, moreover, the banderole 1 formed in this way contracts after stretching to such an extent that the objects packed in it can also be guaranteed to slip out after the packaging has been completed. In addition, due to the special design of the packaging material 8, a certain static friction can also be exerted on the objects packed in it, which ensures that the objects are immovably received inside the banderole 1 and one or more of the objects is reliably prevented from slipping out . The static friction mentioned here can not only be exerted by the banderole 1, but also, for example, by the surface of the objects packaged therein.

In FIG. 2, in which the reference symbols from FIG. 1 have been retained, the process sequence for producing a banderole from the packaging material 8 according to the invention is shown schematically.

In FIG. 2, a roll of the packaging material 8 is denoted by 7, as it is rolled up onto a spool from the production, for example from a paper machine. The packaging material 8 is rolled from the roll 7 of the packaging material 8 in the direction of the arrow 9 unrolled, which arrow 9 also corresponds to the machine direction of the machine on which the packaging material 8 was produced, for example a paper machine. When a sufficient length of the packaging material 8 has been unrolled, it is cut off along the width of the packaging material 8, as indicated by the dashed line 10. FIG. In a second step, this cut length of packaging material 8 is turned through 90°, as indicated by arrow 11, in order to have the original machine direction 9 now arranged in the transverse direction of the cut piece of packaging material 8, as shown in turn by the arrow 9 is indicated. The cut piece of packaging material 8 has a length L in the machine direction of the roll of packaging material 8, which essentially corresponds to the circumference of a banderole 1 to be formed from this packaging material 8, depending on the subsequent method of connecting the packaging material 8 either a slight excess length is selected in order to be able to glue the ends over one another, especially when using a packaging material coated with a thermoplastic, such as PE or PLA, for thermal sealing or, in principle, the exact circumferential length of the banderole is selected if the Connection by crimping, stapling, sewing or the like. In a third step, a tube is formed from this severed length of the packaging material 8, any conventional tube forming method being able to be used here, as is indicated in the figure. In the present case, the hose is formed in such a way that the free ends 2, 3 of the packaging material 8 overlap by a distance or a length 4, in order to subsequently be able to glue the free ends 2, 3 to one another, for example, in particular even to be glued twice. The free ends of the packaging material 8 are here, as in Fig. 1, denoted by the reference numerals 2 and 3 and the overlapping piece with 4, as shown for example in Fig. 1a produced hose are either printed or any further treatment, such as perforating, marking, punching or in particular cutting are subjected to produce the banderoles 1 according to the invention from the material.

Needless to say, the second step of the process of folding the packaging material 8 by 90° can also be carried out after the tube forming. In any case, the packaging material 8 must be connected to one another along the edges 2, 3 in order to have the favorable material properties, which result from the machine direction of the manufacture of the kraft paper, available in the circumferential direction of a finished banderole 1.

With regard to the optional process steps, such as printing, perforating or the like, it should be noted that these must be carried out before or after each separation of the web of packaging materials 8 of the Tambour following step can be carried out. It can thus be advantageous to print the piece of packaging material that has been cut off immediately and only then to form a tube from the packaging material 8 .

The banderole or loop 1 can not only be designed in one color, but also printed in several colors, provided with company wordings, logos and the like, and it can also have a one-sided or two-sided coating, for example to improve the moisture resistance of the packaging material 8 . Finally, it can also have more than one ply of the unbleached kraft paper. A laminate consisting of more than one layer of the kraft paper, each with a layer of the coating material between the individual kraft paper plies and a respective outer layer of the coating material, can be formed. The basis weights of the individual layers of coating material and also the basis weights of the individual layers of kraft paper can also differ from one another. In this case, it should be noted that the essential properties of the banderole 1 must not be changed and neither the elongation at break nor the bursting strength, the tearing length, etc. are changed in comparison to an optionally coated single-layer paper banderole.

Finally, it goes without saying that a banderole 1 according to the invention can be used not only to hold heavy and hard objects or plastic cans together, but also, for example, to surround socks, or to connect food such as bananas, courgettes, cucumbers or the like or cartons can be sealed. Goods or foodstuffs, boxes and the like packed in cans, for example, can also be connected to one another to form bundles.

Furthermore, the invention is explained in more detail below with reference to exemplary embodiments.

Example 1 Production of a packaging material based on unbleached kraft paper with a grammage of 82 g/m ²

Process description:

An unbleached pulp consisting of 100% primary softwood pulp (mixture of spruce and pine) with a kappa number of 51 was first subjected to high-consistency beating with a beating capacity of 230 to 240 kWh/t, with a freeness of the pulp after high-consistency beating of 17 °SR was. This pulp was then subjected to low-consistency beating with a beating capacity of 90 to 100 kWh/t. The additives listed below were metered into the constant flow section of the paper machine. here the pH value was adjusted to a pH value of 6.8 to 7.0 with aluminum sulfate, cationic starch with a degree of cationization DS of 0.03 was metered in in an amount of 17 kg/t paper dry as Sizing agents were alkenyl succinic anhydrides in an amount of 0.8 kg/t dry kraft paper and 10 kg/t PAAE as wet strength agents. Furthermore, no fillers were added. The consistency of the pulp at the headbox was 0.19%. The dewatering was carried out on a Fourdrinier wire section and with a press section with three nips, whereby one of the presses can be a shoe press, the line pressure on the three nips being 60 kN/m, 90 kN/m and 500 kN/m ( in the shoe press) fraud. Before the still damp paper was fed into the Clupak system, it was subjected to contact drying, conventional drying with the use of hot air at 167 °C, then pre-dried in a slalom dryer section and treated in a Clupak system with a differential speed of -7.9% and finally to dried to a final residual moisture content of 7.5%.

The kraft paper can be used as such for the production of ribbons, bows or banderoles and the paper properties described in the table below were measured in this kraft paper.

The kraft paper thus produced would have the following properties:

Table 1 :

Example 2: Production of a packaging material based on unbleached kraft paper with a grammage of 130 g/m ²

Process description:

An unbleached pulp consisting of 95% primary softwood pulp with a kappa number of 41 and 5% primary hardwood pulp with a kappa number of 40 was first subjected to high-consistency beating with a beating capacity of 190 to 210 kWh/t, with a Freeness of the pulp after high-consistency beating was 19°SR and this pulp was then subjected to low-consistency beating with a beating capacity of 70 to 80 kWh/t. The auxiliary materials were added in the approach flow of the paper machine. Here, the pH was adjusted to a value of 6.8 to 7.0 with aluminum sulfate, cationic starch with a degree of cationization DS of 0.03 was metered in in an amount of 14 kg/t paper atro and the sizing agent was alkenylsuccinic anhydride used in an amount of 0.8 kg/t kraft paper atro. Glyoxalated PAM with 10 kg/t kraft paper atro was used as wet strength agent. Furthermore, no fillers were added. The consistency of the pulp at the headbox was 0.23%. Dewatering was carried out on a Foudrinier wire section and with a press section with three nips, one of which may be a shoe press, with the line pressure at the three nips being 60 kN/m, 90 kN/m and 500 kN/m (in the shoe press) fraud. The kraft paper is pre-dried and then treated in a Clupak system with a differential speed of -8.6% and finally dried to a final moisture content of 7.5%

The kraft paper can be used as such and the paper properties described in the table below were measured with this paper.

The kraft paper thus produced had the following properties:

Table 2:

Example 3: Production of a packaging material based on unbleached kraft paper with a grammage of 130 g/m ²

Process description:

An unbleached pulp consisting of 95% primary softwood pulp with a kappa number of 41 and 5% primary hardwood pulp with a kappa number of 40 was first subjected to high-consistency beating with a beating capacity of 190 to 210 kWh/t subjected to a beating degree of the pulp after high-consistency beating was 19 °SR and then this pulp was subjected to low-consistency beating with a beating capacity of 70 to 80 kWh/t. The auxiliary materials were metered in the approach flow of the paper machine. Here, the pH was adjusted to a value of 6.8 to 7.0 with aluminum sulfate, cationic starch with a degree of cationization DS of 0.03 was metered in in an amount of 14 kg/t paper atro and the sizing agent was alkenylsuccinic anhydride used in an amount of 0.8 kg/t kraft paper atro. Glyoxalated PAM with 10 kg/t kraft paper atro was used as wet strength agent. Furthermore, no fillers were added. The consistency of the pulp at the headbox was 0.23%. Dewatering was done on a Foudrinier wire section and with a three nip press section, one of which may be a shoe press, with the line pressure at the three nips being 60 kN/m, 90 kN/m and 500 kN/m (in the shoe press) fraud. The kraft paper is pre-dried and then treated in a Clupak system with a differential speed of -8.6% and finally dried to a final moisture content of 7.5%.

The kraft paper thus produced would have the following properties:

Table 3:

Example 4 Production of a packaging material based on unbleached kraft paper with a grammage of 161 g/m ²

Process description: An unbleached pulp consisting of 100% primary softwood pulp with a kappa number of 46 was first subjected to high-consistency beating with a beating capacity of 210 to 220 kWh/t, with a freeness of the pulp after high-consistency beating being 18 °SR and this pulp was then subjected to low-consistency beating with a beating capacity of 70 to 85 kWh/t. The auxiliary materials were added in the approach flow of the paper machine. Here, the pH was adjusted to a value of 6.8 to 7.0 with aluminum sulphate, cationic starch with a degree of cationization DS of 0.05 was metered in in an amount of 12 kg/t kraft paper atro and the sizing agent was used the alkenylsuccinic anhydrides in an amount of 0.8 kg / t Kraft paper atro. Furthermore, talc was added as a filler in an amount of 2 kg/t of kraft paper atro. The consistency of the pulp at the headbox was 0.25%. The dewatering took place on a Fourdrinier wire section, such as a three-nip press section, the line pressure at the three nips being 60 kN/m, 80 kN/m and 80 kN/m, respectively. The kraft paper was pre-dried, then fed into the Clupak system and subjected to a differential speed of -10.9%, then finally dried to a final residual moisture content of 8%.

The kraft paper can be used as such and the paper properties described in the table below were measured with this kraft paper.

The paper thus produced had the following properties:

Table 3:

Needless to say, the kraft papers according to the invention can also be calendered, for example in a soft nip or long nip calender, or in particular can also be subjected to a coating treatment, such as a dispersion coating treatment with a thermoplastic such as HOPE, LDPE, PLA or PP. With such further treatments, however, the essential properties of the packaging material, such as elongation at break, Bendtsen roughness, tearing length, tear propagation resistance index, tensile strength index, are not changed, in particular not worsened. If a loop or banderole is also made from the packaging material, it must be ensured that the packaging material is arranged in such a way that the original machine direction is arranged in such a way that when the banderole is subjected to a stretching stress, it causes an increase in diameter or stretching by up to 20% of the banderole or ribbon. The manner in which the free ends of the packaging material forming the loop or band are connected can be changed by an optionally applied coating on one side or two sides of the band. In particular, thermal sealing of the free ends is carried out in such a case. Without coating, the free ends can be connected by gluing, stapling, brimming or also sewing or the like. In the case of a packaging material coated on one side, a connection using a hot-melt adhesive, hot-melt or the like can also be provided. In the case of packaging materials coated on both sides, a direct connection of two coating layers is provided in particular, which can be achieved with an extremely short expenditure of time.

Multi-layer packaging materials are preferably formed as laminates consisting of at least one kraft paper layer, preferably several kraft paper layers, and at least two coating layers consisting of a polyolefin, in particular HOPE, LDPE or PP or PLA.

Example 5 shows a laminate consisting of an unbleached kraft paper layer (KP) with a basis weight of 120 g/m ² and an outer coating layer of HDPE with a basis weight of 15 g/m ² on both surfaces of the base paper. The Kraft paper was made as described in Example 3. An extrusion coating method was used as the coating method. The laminate formed thus has the following structure: 15 g/m ² HDPE/120 g/m ² KP/12 g/m ² HDPE.

The laminate produced in this way had the properties described in the table below.

Table 4

Example 6 shows a laminate consisting of 3 kraft paper layers (KP) each with a basis weight of 120 g/m ² and both an outer coating layer made of LDPE with a basis weight of 15 g/m ² and a LDPE coating between two kraft paper layers a basis weight of 12 g/m ² . The kraft paper was made as described in Example 3. An extrusion coating process was used as the coating process. The laminate formed thus has the following structure:

15 g/ ^m2 LDPE/120 g/ ^m2 CP/12 g/ ^m2 LDPE/120 g/m2 ^CP /12 g/ ^m2 LDPE/120 g/ ^m2 CP/15 g/ ^m2 LDPE

Table 5

Furthermore, it is possible to replace one or all of the polyolefin or polylactic acid layers arranged between two layers of paper with a glue and thereby produce a firm cohesion of the individual layers forming the laminate. In this case, however, it is essential that the two outer coating layers are made of a polyolefin or PLA.

A strap made from a laminate of this type could be used on conventional strapping machines and, above all, heavy and bulky objects could also be held together or packed without fear of the strap tearing. A strap made from such a laminate could thus be used as a replacement for a conventional strapping strap made entirely of plastic.

Claims

patent claims

1. Packaging material (1) consisting of an unbleached kraft paper with a kappa value according to ISO 302:2015 between 38 and 60, preferably between 40 and 58 as the base paper, the kraft paper being made from at least 90% primary cellulose and a basis weight according to ISO 536:2019 between 65 g/m ² and 170 g/m ² , characterized in that the kraft paper contains at least 90% primary pulp containing at least 80%, preferably at least 85%, in particular at least 88% pulp with an average length-weighted fiber length according to ISO 16065-2:2014 between 2.0 mm and 2.9 mm and less than 5%, preferably less than 4.5%, in particular less than 4.2% fillers and cationic starch and other processing aids that the Primary cellulose as ground, in particular high-consistency ground cellulose with a freeness according to Schopper-Riegler according to ISO 5267-1:1999 between 13 °SR and 20 °SR is contained, that there is an elongation at break ratio MD/CD of the kraft paper according to ISO 1924- 3:2005 of >1.1, a tearing length in the machine direction according to ISO 1924-3:2005 of >10 km, that a tear propagation resistance index in the transverse direction of the kraft paper according to ISO 1974:2012 of >16.0 mN .m ² /g and that the kraft paper is optionally coated on at least one side with a coating material.

2. Packaging material (1) according to claim 1, characterized in that the primary pulp consists of a mixture consisting of at least 80% softwood pulp, more preferably at least 90% softwood pulp, in particular at least 95% softwood pulp with an average length-weighted fiber length according to ISO 16065- 2:2014 of at least 2.0 mm, preferably at least 2.2 mm and the remainder consists of hardwood pulp with an average length-weighted fiber length according to ISO 16065-2:2014 of at least 1.0 mm

3. Packaging material (1) according to claim 2, characterized in that it has a starch content of 0.5% to 2.2% of the paper, in particular 0.7% to 2.0%

4. Packaging material (1) according to claim 1, 2 or 3, characterized in that it has a tensile strength index in the machine direction according to ISO 1924:3 - 2005 of >105 Nm/g, preferably at least 115 Nm/g.

5. Packaging material (1) according to any one of claims 1 to 4, characterized in that it has a TEA index in the longitudinal direction according to ISO 1924-3:2005 greater than 5.0 J/g, preferably greater than 5.5 J/g having.

6. Packaging material (1) according to one of claims 1 to 5, characterized in that it has a bursting strength according to ISO 2758:2014 of greater than 750 kPa, preferably greater than 770 kPa, particularly preferably greater than 800 kPa.

7. Packaging material (1) according to any one of claims 1 to 6, characterized in that it has a wet strength index according to ISO 3781:2011 in the machine direction of the kraft paper of at least 14.0 Nm/g, in particular 15.2 kN/m preferably at least 15.5 Nm/g.

8. Packaging material (1) according to any one of claims 1 to 7, characterized in that on at least one side a coating material selected from a polyolefin or polylactic acid (PLA) in an amount corresponding to 1/15 to 1/6 of the basis weight of the kraft paper is applied.

9. Packaging material (1) according to any one of claims 1 to 8, characterized in that the polyolefin is selected from high density polyethylene (HDPE), low density polyethylene (LDPE) or polypropylene (PP).

10. Packaging material (1) according to any one of claims 1 to 9, characterized in that it forms a laminate consisting of several layers of kraft paper and several layers of the coating material.

12. Packaging material (1) according to claim 11, characterized in that the laminate has at most 5 layers of kraft paper, such as 4 plies, more advantageously 3 plies, preferably 2 plies of kraft paper and at most 6 plies of the coating material, such as 5 Layers, cheaper 4 layers, preferably 3 layers of the coating material.

13. Packaging material (1) according to claim 12, characterized in that each layer of the coating material located between two layers of kraft paper has an amount corresponding to 1/15 to 1/9 of the basis weight of the kraft paper and an outer side of the laminate forming layer of the coating material has an amount corresponding to 1/11 to 1/6 of the basis weight of the kraft paper.

14. Banderole (1) made from a packaging material (1) according to one of claims 1 to 13, characterized in that it consists of a closed, in particular crimped, glued, preferably double glued, welded, ge- stapled, sewn or riveted, optionally coated, at least one-ply web of packaging material made essentially of unbleached kraft paper, and that a machine direction of the paper web in the packaging material forms a circumferential direction of the banderole.

15. Banderole (1) according to claim 14, characterized in that it is loaded by enclosed objects (5) to train, in particular with a tensile stress that is less than an elongation at break in the machine direction (MD) measured according to ISO 1924-3: 2005 , optionally coated paper web.

16. Banderole (1) according to claim 14 or 15, characterized in that the elongation at break in the machine direction (MD) measured according to ISO 1924-3:2005 of the packaging material is >8%.

17. Banderole (1) according to any one of claims 14, 15 or 16, characterized in that it consists of a laminate consisting of several layers of kraft paper and several layers of the coating material, such as a maximum of 5 layers of kraft paper, for example 4 layers, cheaper 3 plies, preferably 2 plies, of the kraft paper and at most 6 plies of the coating material, such as 5 plies, more advantageously 4 plies, preferably 3 plies of the coating material.

18. A method for forming a band from a packaging material according to any one of claims 1 to 13, characterized in that a length of the band that is to be formed and a length slightly exceeding the circumference of the band from a web of packaging material essentially consisting of unbleached kraft paper unwound in the machine longitudinal direction packaging material is cut off, the cut length of packaging material is pivoted by 90°, those two free edges of the cut length, which run in the transverse machine direction when the web of packaging material is unwound, are folded over one another and closed to form a tube and that from a large number of banderoles are separated from the closed tube or prepared for separation, in particular perforated, scored or marked.

19. The method according to claim 18, characterized in that the pivoting of the cut length of the packaging material by 90° before or after folding over one another and sealing those two free edges of the cut length which are present during the unrolling of the web of packaging material in run in the cross-machine direction.

20. Use of a banderole (1) produced from the packaging material according to one of claims 1 to 17 for tightly enclosing a plurality of objects which are the same or different from one another.