Recyclable polypropylene stand-up pouch

Abstract

A recyclable polypropylene-based stand-up beverage pouch (1) has a front surface (2), a back surface (3), and a bottom surface (4), each of which has a transparent outer layer (5, 10) and a sealing layer (9, 11), the sealing layer (9, 11) having a thickness greater than that of the outer layers (5, 10).

Description

[Technical Field]

[0001] The present invention relates to a recyclable stand-up pouch for beverages having a front, back and bottom surface, each of which has a transparent outer coating and a sealing coating. [Background technology]

[0002] Stand-up pouches are flexible packaging that can stand upright on their base and are typically used for powders, pastes, or ready-to-drink beverages. To ensure the pouch's ability to stand upright, the bottom portion of the stand-up pouch is provided with side gussets.

[0003] In 1963, Doyen, in patent DE 1281140, disclosed a pouch having a base made of a thermoplastic material consisting of two thin film coverings connected by a W-shaped inwardly folded bottom piece and welded together at the edges along the height of the pouch by a longitudinal weld line.

[0004] Stand up pouches (SUPs) were first produced about 60 years ago. Early designs used a laminate of a layer of polyethylene terephthalate (PET) and a layer of polyethylene (PE). Optionally, an aluminum foil layer could be sandwiched between them. This type of design is still in commercial use, with a typical construction featuring a thin, approximately 12 μm layer of PET, an approximately 8 μm layer of aluminum foil, and a thicker, approximately 80 μm layer of polyethylene. One problem with this SUP design is that the different construction materials make recycling the pouch very difficult or impossible.

[0005] Stand-up pouches as known today are in fact used in mass-produced commercial products, and typical structures of such thin film packaging pouches are also known, for example, from EP 2032454 B1 and EP 2364848 B1.

[0006] In many cases, the material used for the bag wall is a laminated composite bag membrane, where the inner membrane is made from polyethylene (PE) and the outer membrane is polyethylene terephthalate (PET) or biaxially oriented polypropylene (BO-PP) based, and the printing layer for such a laminated composite is applied to the outer membrane or inner membrane on the inside of the contact surface, after which the inner membrane is adhesively bonded to the outer membrane and then becomes visible through the transparent outer membrane.

[0007] Such conventional thin film packaging bags are characterized by a particularly high-quality appearance and good functional properties. However, due to the laminate of different polymer materials, recycling of pure plastics is not possible, and for that reason, each thin film packaging bag is usually landfilled or, at best, incinerated as a disposable product after use. However, thermal recycling is at least possible.

[0008] At the same time, it will be possible to optimize the way plastic materials, and therefore packaging films, are currently produced and disposed of. As part of its "Green Deal," the European Union aims to reduce the amount of plastic waste sent to landfills. By 2030, it aims to recycle 55% of plastic packaging waste.

[0009] To meet the challenges of recycling, packaging designs must become increasingly sustainable. This can be achieved, for example, by implementing more mono-material designs. The challenge here is to achieve the very different properties of one package, previously achieved by combining different plastic layers from different material systems, in just one recyclable mono-material design.

[0010] Biaxially oriented polypropylene (BOPP) film, uniaxially oriented polyethylene (MDO-PE) film, and cast polypropylene film have been shown to exhibit good stiffness and toughness for use in stand-up pouches and can be constructed to be thinner.

[0011] WO2021 / 156898 discloses a stand-up pouch made from a biaxially oriented polypropylene (BOPP) film, which includes at least one core layer made of a polypropylene-based material and having an outer surface and an inner surface, an inner intermediate layer made of a polypropylene-based material or a polyethylene-based material and adjacent to the inner surface of the core layer, an inner skin layer made of a polypropylene-based material or a polyethylene-based material and adjacent to the inner intermediate layer, and an outer skin layer corresponding to the outer surface of the core layer.

[0012] At the same time, the same mechanical properties cannot be achieved as with multi-material designs, which presents new challenges for the design and construction of stand-up pouches, affecting their dimensional and upright stability. Because of the varying material properties, it is difficult to obtain the exact familiar characteristic pouch shape.

[0013] Furthermore, commercially available beverage stand-up pouches are filled and vacuum sealed at temperatures in excess of 85° C. Mono-material pouch designs must be able to maintain pouch shape and closure seal performance under hot-fill conditions. Summary of the Invention [Problem to be solved by the invention]

[0014] The objective of the present invention is to provide a recyclable stand-up pouch as a mono-material design that maintains the familiar, typical shape of a stand-up pouch. In addition, the stand-up pouch must meet the requirements of the Plastics Agreement 2025 and be fully recyclable. The stand-up pouch must protect the pouch contents from spoilage, ensure a long, flavorful shelf life, and provide a high barrier to oxygen and water vapor penetration. The stand-up pouch must be sealable and suitable for hot-filling beverages. The flexible pouch packaging must be safe for human health and ecologically sustainable. Furthermore, the stand-up pouch must have a pleasant feel. [Means for solving the problem]

[0015] According to the present invention, this object is met by a recyclable stand-up pouch, a method and a use according to the main independent claim. Preferred variants can be seen from the dependent claims, the description, exemplary embodiments and the drawings.

[0016] According to the invention, the sealing coating has a greater thickness than the outer coating.

[0017] The overmold forms the outer shell of the upright pouch and is configured to be transparent to reveal and protect the printed image imparted by the reverse printing.

[0018] The outer coating is advantageously formed from biaxially oriented polypropylene (BOPP), which is formed so as to be stretched by more than 2.0 times, preferably more than 3.0 times, in particular more than 4.0 times, and / or to be stretched by less than 7.0 times, preferably less than 6.5 times, in particular less than 6.0 times, so that the advantages of the outer coating in terms of good stiffness and toughness are ideally realized, making it possible to apply printed images with repeatability even to particularly thin outer coatings.

[0019] In one embodiment, it is provided that the sealing coating is formed to be 2 to 4 times or 2.5 to 3.5 times thicker than the outer coating, thereby achieving a reliable seal using as little material as possible while at the same time ensuring sufficient pouch rigidity.

[0020] The outer coating may be made of BOPP, and the BOPP may be stretched to a stretch ratio of more than 1.1 and less than 2, particularly more than 1.2 and less than 1.8, thereby reducing the amount of material used while maintaining high flexibility and ensuring rigidity.

[0021] In one embodiment, it is provided that the front and / or back and / or bottom surface has at least one functional coating disposed between the outer coating and the sealing coating, the functional coating comprising metallized BOPP, and the metallized BOPP is formed to be stretched more than 1.1 times and less than 2 times, particularly more than 1.2 times and less than 1.8 times, thereby using less material while meeting requirements regarding hermeticity and / or opacity.

[0022] It can further be provided that the sealing coating is made of cast polypropylene (CPP) and that the CPP is stretched to a stretch ratio of more than 3 times and less than 8 times, particularly more than 4 times and less than 7 times, thereby maintaining good sealing results while ensuring reduced material usage.

[0023] Ideally, the thickness of the outer coating is greater than 5 μm, preferably greater than 10 μm, in particular greater than 15 μm, and / or less than 45 μm, preferably less than 40 μm, in particular less than 35 μm, so that the outer coating is made as thin as possible while at the same time ensuring sufficient stability, thereby making it possible to obtain a typical upright pouch shape.

[0024] Ideally, the overcoat is formed to be multi-layered, with the overcoat having three or more layers, preferably four or more layers, especially five or more layers.

[0025] For example, the outer coating has a polypropylene content of more than 92.5% by weight, preferably more than 95% by weight, in particular more than 97.5% by weight. This very high polypropylene content allows the stand-up pouch to be designed as a mono-material stand-up pouch structure, making it recyclable.

[0026] The inside of the stand-up pouch is formed by a sealed covering.

[0027] In a particularly advantageous variant of the invention, the sealing coating is formed from a multi-layer cast polypropylene coating, which is particularly advantageous for the sealing process.

[0028] Ideally, the thickness of the sealing coating is more than 45 μm, preferably more than 60 μm, in particular more than 75 μm, and / or less than 125 μm, preferably less than 105 μm, in particular less than 85 μm, so that the sealing coating is made as thin as possible while at the same time ensuring the sealing ability of an absolutely hermetic sealing seam.

[0029] Ideally, the sealing coating is formed to be multi-layered, with the sealing coating having three or more layers, preferably four or more layers, especially five or more layers.

[0030] For example, the seal coating has a polypropylene content of more than 92.5 wt.%, preferably more than 95 wt.%, especially more than 97.5 wt.%. This very high polypropylene content allows the stand-up pouch to be designed as a mono-material stand-up pouch structure, making it recyclable.

[0031] Preferably, the outer covering and the sealing covering are joined by an adhesive layer and assembled into a rectangular front and rear surface. The bottom surface of the upright pouch can have the same structure in principle. In an advantageous variant, the thickness of the outer covering and the sealing covering on the bottom surface is made slightly thinner. The front, rear and bottom surfaces of the upright pouch are connected by a sealing structure. The rectangular front and rear surfaces are placed on top of each other, and the W-shaped folded bottom surface is inserted between them.

[0032] In a particularly preferred variant of the invention, the sealing coating is made to be more than 2.00 times thicker than the outer coating, preferably more than 2.25 times thicker, in particular more than 2.50 times thicker, thereby realizing advantageous sealing capabilities of the stand-up pouch, which is configured as a mono-material design.

[0033] Ideally, the seal coat is formed to be less than 6.50 times thicker than the outer coat, preferably less than 6.25 times thicker, and especially less than 6.00 times thicker. A seal coat that is too thick compared to the outer coat can adversely affect sealing properties.

[0034] Heat sealing is a common method for creating seams in flexible stand-up pouches. The purpose of sealing is to join sealable materials together in an absolutely hermetic and secure manner. "Hermetic" specifically means impervious to microbial contamination and the permeation of oxygen and water vapor, which are known to cause spoilage of the food and hygroscopic contents within the stand-up pouch. The specific thickness and configuration of the cast polypropylene seal coating and the sealing process itself achieve the required absolute hermeticity of the stand-up pouch.

[0035] Heat sealing uses two heated rods that apply pressure to the materials to be sealed while simultaneously transferring heat to the cut surface, causing the materials to melt and form a bond. The pressure ensures good contact between the materials and promotes penetration of the molten viscous material at the cut surface, which forms a permanent, sealed bond after cooling. Sealing is understood to be a time-efficient process that successfully joins the front, back, and bottom to form an upright pouch.

[0036] In a highly advantageous variant of the invention, the front and / or rear and / or bottom face has at least one functional coating arranged between the outer covering and the sealing coating. Preferably, the functional coating is adhesively bonded between the outer covering and the sealing coating. The functional coating is configured as an ideal barrier against oxygen and water vapor. At the same time, the functional coating provides additional protection for the pouch against punctures.

[0037] Ideally, the functional coating has a thickness of less than 25 μm, preferably less than 20 μm, especially less than 15 μm, and / or more than 6 μm, preferably more than 9 μm, especially more than 12 μm.

[0038] The stand-up pouch of the present invention features an advanced polypropylene-based mono-material design. Ideally, the stand-up pouch has a polypropylene content of more than 92.5% by weight, preferably more than 95% by weight, and particularly more than 97.5% by weight. This superior polypropylene-based mono-material design offers advantageous recyclability and thus complies with the EU's "Green Deal" requirements. The stand-up pouch of the present invention, thanks to its seal-to-outer-coat thickness ratio, achieves very different characteristics that could previously only be achieved through the combination of multiple materials, while at the same time being particularly sustainable, particularly due to its recyclability.

[0039] Ideally, the functional coating comprises a barrier layer and / or a metallized layer and / or a metal layer and / or at least one BOPP layer.

[0040] In an advantageous variant, the functional coating is configured as a BOPP coating. A very thin aluminum layer is vapor-deposited onto the BOPP layer. At the same time, the coating is prepared for adhesive lamination. This coating provides an exceptional barrier against oxygen, flavors, and aromas, and has an excellent water vapor barrier.

[0041] In an advantageous variant of the invention, the BOPP coating is vapor-deposited, preferably vacuum-deposited. Preferably, a metal layer, in particular an aluminum and / or aluminum oxide layer, is vapor-deposited thereon. The thickness of the metallized layer is greater than 10 nm, preferably greater than 15 nm, in particular greater than 20 nm, and / or less than 60 nm, preferably less than 50 nm, in particular less than 40 nm.

[0042] For example, the functional coating has a polypropylene content of more than 92.5 wt.%, preferably more than 95 wt.%, especially more than 97.5 wt.%. This very high polypropylene content allows the stand-up pouch to be designed as a mono-material stand-up pouch structure, making it recyclable.

[0043] Ideally, the metallized layer contributes to favorable reflection of UV light incident on the stand-up pouch from the outside.

[0044] In an alternative variant, the functional coating is configured as an alternative barrier layer. Preferably, the barrier layer is applied between the sealing coating and the outer coating by plasma-assisted chemical vapor deposition.

[0045] Preferably, the deposited barrier layer can be formed from silicon oxide. Alternatively, or in addition, the barrier layer can be formed from an amorphous carbon layer. Furthermore, the barrier layer can also be composed of a ceramic coating and / or aluminum oxide.

[0046] Preferably, the alternative barrier layer has a thickness of 2 to 8 nm.

[0047] In a further alternative variant of the invention, the barrier layer may be configured as an ethylene vinyl alcohol and / or polyvinyl alcohol layer.

[0048] In a completely different alternative embodiment of the invention, the barrier layer can be in the form of a printed primer layer. The barrier layer can be, for example, an ethylene vinyl alcohol and / or polyvinyl alcohol layer and / or a polymer containing carboxyl groups. The barrier layer can then be applied to the inside or outside of the outer coating or to the outside of the seal coating.

[0049] The front side preferably has an insertion system for inserting a drinking straw.

[0050] The stand-up beverage pouch includes an insertion system for inserting a drinking straw, the drinking straw including a tubular straw element including a straw wall, an inlet disposed inside the stand-up pouch, and an outlet disposed outside the stand-up pouch.

[0051] The straw elements can be manufactured using an injection molding process. The cross section of the straw elements can be circular, oval, triangular, or square.

[0052] Ideally, the packaging sleeve for the straw element, which ensures hygienic closure of the straw element until the beverage is consumed, is formed by a thin, transparent polypropylene coating. This polypropylene coating is attached to the stand-up pouch in a manner that makes it very difficult to remove. The packaging sleeve can be easily opened to release the straw element. A strong bond between the packaging sleeve and the stand-up pouch allows both to be effectively recycled.

[0053] The cross-sectional area of ​​the insertion system and the cross-sectional area of ​​the straw element can be similar, taking into account the wall thickness of the straw wall, and the cross-sectional area of ​​the insertion region can be 1% to 100%, in particular 30% to 70% larger than the cross-sectional area of ​​the straw element, taking into account the wall thickness of the straw wall.

[0054] The printing processes used for high quality packaging are typically serial printing processes such as gravure or flexographic serial printing.

[0055] The outer coating has printing, which is preferably applied using reverse printing. Advantageously, the printing can be applied as a semi-transparent print, i.e., from the back side of the outer coating to the inside, thereby providing extra protection for the printed image by the outer coating. The outer coating is printed to identify the brand and ingredients of the beverage, as well as to create a visual impression of the beverage pouch.

[0056] A frequently used method for printing on outer coverings is flexographic serial printing. This is a direct relief printing process, also known as a web-fed rotary printing process. Flexible printing plates made from photopolymers or rubber are used in combination with low-viscosity printing inks. The raised areas of the plate carry the image. These advantages include cost-effectiveness due to the large printing widths and fast printing speeds, as well as the availability of inexpensive printing inks. Printing tools, photopolymer printing plates, and / or laser-engraved elastomeric sleeves are readily available. Flexographic printing can be used to economically produce large print runs.

[0057] In an alternative variation of the invention, the functional coating and / or metallization layer may also be printed.

[0058] The gas permeability of membranes is determined at atmospheric pressure according to DIN EN ISO 2556. A membrane test specimen then separates two chambers, one of which contains the test gas at atmospheric pressure, while the other chamber, with a known initial volume, is evacuated until a near vacuum is obtained. The amount of gas flowing through the test specimen from one chamber to the other is determined as a function of time by measuring the pressure rise in the second chamber using a pressure gauge.

[0059] The upright pouch is 10cm when measured at 23°C and 0% RH. 3 / m 2 · Day · Less than 5 cm 3 / m 2 · Day · Less than bar, especially 0.1cm 3 / m 2 It is advantageous for the beverage to have an oxygen transmission rate of less than 1000 kJ / day and 1000 kJ / bar, which allows the beverage to be stored in an upright pouch for extended periods without artificial preservatives.

[0060] Water vapor permeability is determined using a gravimetric method according to DIN 53116. A test container filled with desiccant is sealed with a sample of the pouch membrane and exposed to a given test climate. The amount of water that passes through the sample is determined by weighing. 1 to 200 g / (m 2 The amount of water that can be detected is within the range of d). The detection limit also depends on the sample properties and thickness.

[0061] Stand-up pouches are rated to 10g / m² in 24 hours in accordance with ASTM D6701-01. 2 Less than 5 g / m 2 Less than 0.1 g / m 2 Ideally, the pouch should have a water vapor permeability of less than 1000 psi, which allows hot filled liquids to be stored in the stand-up pouch for extended periods of time with a long shelf life without the contents evaporating from the bag.

[0062] The thickness of the film is measured in accordance with DIN 53370 and is given as an average value. In an advantageous variant of the invention, the front and / or rear surface has a thickness of less than 180 μm, preferably less than 160 μm, in particular less than 140 μm, and / or more than 80 μm, preferably more than 90 μm, in particular more than 100 μm. This allows the stand-up pouch to be made particularly thin and therefore lightweight, while still offering good durability.

[0063] In an advantageous variant, the thickness of the front surface and / or the rear surface is greater than the thickness of the bottom surface by more than 1.1 times, preferably more than 1.2 times, and particularly more than 1.3 times, and / or less than 2.0 times, preferably less than 1.8 times, and particularly less than 1.6 times, the thickness of the bottom surface, thereby minimizing the amount of material used and simultaneously ensuring the lateral rigidity required for stable formation of an upright pouch.

[0064] In a particularly advantageous variant of the invention, the sealing coating is formed from a multi-layer cast polypropylene coating, which is particularly advantageous for the sealing process.

[0065] In an advantageous variant of the invention, at least one layer of the multilayer cast polypropylene coating contains TiO2 inclusions.

[0066] Filler content can be determined using known measurement methods, such as incineration. A sample with a known initial weight is heated to a temperature at which the polymer decomposes but not the filler. For example, 560°C has been found to be effective for this purpose. The sample is then reweighted. The polymer content per square meter can be calculated from the difference between the initial and final weights.

[0067] As an alternative to ashing, TGA is used, where the weight of the sample is measured continuously as it heats up. This test method also clearly distinguishes between polymer and filler, allowing the polymer content of the film to be determined.

[0068] In an advantageous variant of the invention, at least one layer of the multilayer cast polypropylene coating comprises an inorganic filler, the filler content being greater than 0.5% by weight, preferably greater than 1.0% by weight, in particular greater than 1.5% by weight.

[0069] The filler is ideally titanium dioxide, which makes it possible to obtain a white layer with advantageous opacity.

[0070] In a particularly advantageous variant, the filling layer of the sealing coating has an opacity of more than 55%, preferably more than 70%, in particular more than 85% according to DIN 53416. This advantageously absorbs light incident on the stand-up pouch from the outside and thereby contributes to the shelf life of the beverage in the stand-up pouch.

[0071] In a preferred variant, the innermost layer of the multi-layer cast polypropylene covering, which contacts the beverage, is formed to be free of pigments, in particular free of titanium dioxide, thereby substantially preventing contact between the beverage and the pigments, or even contamination of the beverage by the pigments.

[0072] A particular challenge lies in the dimensional accuracy of the front and back surfaces, which are generally made from the same material, especially from the same roll material. The future front and back surfaces are simultaneously printed onto the roll material of the outer coating and adhesively bonded to the functional and sealing coatings. Only special material selection and special manufacturing processes make it possible to produce such dimensionally accurate outer coatings that can be printed with very tight tolerances. The outer coating is characterized by particularly small deviations in thickness per unit area.

[0073] Preferably, the front and rear surfaces form a mirror-symmetric structure with different coatings. In alternative variations of the invention, the coatings can also be arranged differently.

[0074] In an alternative variant of the invention, the functional coating can also in principle be joined to the outer coating and the sealing coating by thermal lamination.

[0075] In an advantageous variant of the invention, the sealing coating contains an antistatic agent, which may be selected from the group consisting of glyceryl esters, fatty acids, tertiary amines, fatty acid amides, hydroxyl fatty acid amides, alkali metal sulfonates, polyether-modified polydiorganosiloxanes, polyalkylphenylsiloxanes, and / or mixtures thereof.

[0076] Preferably, the sealing coating comprises an antistatic agent in an amount of 0.01 to 2%, preferably 0.1 to 1.5%, most preferably 0.4 to 1.0% by weight of the coating.

[0077] Because the coatings are often stored in stacks or rolls before preparation and sealing into stand-up pouches, migration of the antistatic agent can occur, and therefore the outer coating can be provided with the antistatic agent as a preventative measure.

[0078] In an advantageous variant of the invention, the front, back and bottom of the stand-up pouch exhibit a shrinkage of less than 2.5%, preferably less than 2.0%, in particular less than 1.5%. This makes the front, back and bottom particularly dimensionally accurate, even in the case of a mono-material design, and allows for very precise printing. This dimensional stability is particularly advantageous for hot filling.

[0079] In an advantageous variant, the stand-up pouch, in particular the outer coating and / or the functional coating, presents a barrier to UV light in the wavelength range of 250 to 800 nm, with a transmission of less than 5%, preferably less than 3%, in particular less than 1%.

[0080] Overall, the sum of these specifications is not easily met by a mono-material design. This can be achieved by a special combination of selected individual coatings or several multi-layer materials configured as a mono-material, and by a special manufacturing method. Furthermore, the upright pouch can be frozen and can withstand the mechanical stresses that accompany it.

[0081] In a further variant of the invention, the outer coating has a heat-resistant coating, which can be, for example, in the form of a layer made of a mixture of amorphous and semi-crystalline polyamides. Such a coating provides an improved barrier to gases, in particular oxygen, and in a further embodiment can be provided with a thin metal or metal oxide layer, for example by a vacuum deposition process.

[0082] Advantageously, the heat resistant coating increases the seal resistance of the outer coating, and thereby the seal resistance of the entire stand-up pouch, by more than 10°C, preferably more than 20°C, especially more than 25°C, compared to a pure polypropylene outer coating.

[0083] In another embodiment, the outer layer of the outer coating comprises at least 90% by weight, preferably more than 95% by weight, of a blend of amorphous and semi-crystalline polyamides. Preferably, the outer layer of the outer coating has a thickness of 2 to 4 μm. This configuration is particularly advantageous for producing stand-up pouches, as the outer side of the outer coating is highly resistant to adhesion to the sealing jaws that transfer heat to form the seal lines on the front, back, and bottom of the stand-up pouch. It should be noted that polyamides have been found to be fully compatible with the concept of material recycling, at manageable proportions relative to the total mass of the stand-up pouch.

[0084] The front, back and bottom of the upright pouch are connected by a sealing structure: the rectangular front and back are placed one on top of the other with a W-shaped folded bottom inserted between them, preferably with a die cut in the bottom to create a vertical seal line.

[0085] The spatial term refers to the filled, stand-up pouch.

[0086] Preferably, horizontal and contoured sealing lines are first created to connect the bottom surface to the front and back surfaces. The contoured sealing lines overlap the horizontal sealing lines, which preferably have a curvature of radius R44 from the center of gravity of the front and back surfaces, then transition to an inclined sealing line and extend to the top fold of the bottom surface. Advantageously, the vertical sealing lines are created last, also enclosing the folded bottom surface within the die-cut area.

[0087] Ideally, the sealing line has a width of 4 mm. The inner radius at the transition from the vertical to the horizontal sealing line and / or the transition from the contoured sealing line to the vertical or horizontal sealing line is R1. Additionally, preferably, the outer rounded corners of the upright pouch have a radius of R4.

[0088] In a further development of the invention, the vertical sealing line has a width in the range of 4.1 to 5 mm.

[0089] To ensure increased stability, which is particularly advantageous when the upright pouch is constructed from a mono-material, i.e., layered structure of individual coatings, a transition structure is formed between the vertical seal line and the contoured rising seal line.

[0090] The sealed transition structure is characterized by a particularly enlarged sealing surface, which provides the stand-up pouch with a reliable standing ability even in the case of a mono-material design, and increases the strength of the sealing seam even under the effect of hot filling of the stand-up pouch. For this purpose, the transition structure has a special shape.

[0091] In a particularly advantageous variant of the invention, the transition structure has a vertical extension of more than 0.2%, preferably more than 0.4%, in particular more than 0.6%, and / or less than 8%, preferably less than 6%, in particular less than 4%, relative to the total length of the vertical sealing line.

[0092] The transition structure has a width relative to the vertical sealing line, which width is greater than 5%, preferably greater than 10%, especially greater than 15%, and / or which width is ideally less than 40%, preferably less than 35%, especially less than 30%.

[0093] In particularly preferred variants of the invention, the transition structure has a circular, oval, lenticular, elongated, rectangular, or square contour. The transition structure can overlap the vertical sealing line and / or the contoured sealing line, so that only a portion of the contour is still visible within the sealing structure. The transition structure ensures the typical rounded shape of an upright pouch despite the altered mechanical properties of the mono-material design.

[0094] Advantageously, the transition structure comprises a circular portion having a radius R oriented perpendicular to the circular portion, this radius being larger than R2, preferably larger than R3, in particular larger than R4, and / or this radius being smaller than R30, preferably smaller than R25, in particular smaller than R20.

[0095] The radius of the circular portion can face outward or inward when the upright pouch is viewed from above.

[0096] Preferably, the front and back of the stand-up pouch are connected by a vertical seal line.

[0097] Preferably, the horizontal seal line and the contoured seal line serve to connect the front or back surface to the bottom surface of the upright pouch.

[0098] Ideally, the bottom surface is connected to the front and back surfaces by vertical and / or horizontal and / or ascending sealing lines.

[0099] In a particularly advantageous variant of the invention, the vertical sealing line has at least one reinforcing structure for generating the body of the pouch.

[0100] Preferably, the reinforcing structure is located in the top half of the upright pouch.

[0101] In a particularly preferred variant of the invention, the reinforcing structure has a circular, oval, lenticular, elongated, rectangular or square profile, whereby the transition structure can overlap the vertical sealing line.

[0102] In an advantageous variant of the invention, the sealed upright pouches are filled with a beverage having a temperature of up to 85° C. Preferably, immediately after the filling process, the upright pouches are sealed by horizontal ultrasonic welding. Alternatively, the upright pouches can also be sealed by heat sealing.

[0103] In addition to the ultrasonic welding, a horizontal seal line is ideally formed to permanently close the upright pouch.

[0104] According to the present invention, a method for making a stand-up pouch comprises extruding an outer covering and a seal covering (or co-extrusion or adhesive bonding if multiple layers are provided within each covering), adhesively bonding the outer covering to the seal covering, and connecting the front to the back and bottom by a sealing structure to form the stand-up pouch. Ideally, the seal covering is not adhesively bonded directly to the outer covering. In an advantageous variant of the invention, a functional covering is additionally adhesively bonded between the outer covering and the seal covering. The seal covering is formed to have a greater thickness than the outer covering.

[0105] According to the present invention, stand-up pouches are used as fully recyclable polypropylene-based disposable beverage packaging for hot-filling beverages.

[0106] Further advantages and features of the invention will become apparent from the description of exemplary embodiments with reference to the drawings, and from the drawings themselves. [Brief explanation of the drawings]

[0107] [Figure 1] FIG. 1 is a perspective view of an upright pouch. [Figure 2] FIG. 1 is a diagram of a sealing structure and an insertion system. [Figure 3] Schematic diagram of the front and back structures. [Figure 4] FIG. 1 is a schematic diagram of the bottom structure. DETAILED DESCRIPTION OF THE INVENTION

[0108] Figure 1 shows a perspective view of a recyclable stand-up beverage pouch 1 having a front surface 2, a back surface and a bottom surface 4. Located on the front surface 2 is an insertion device 12 into which a drinking straw 13 is inserted.

[0109] 2 shows the sealing structure of the upright pouch 1. For this purpose, the front 2, back 3 and bottom 4 of the upright pouch are connected by a sealing structure 14. For this purpose, the W-shaped folded bottom 4 is inserted between the rectangular front 2 and rectangular back 3.

[0110] A horizontal seal line 16 and a contoured seal line 17 connect the bottom surface 4 to the front surface 2 and back surface 3. The contoured seal line 17 has an overlap with the horizontal seal line 16 at the bottom center of both the front surface 2 and back surface 3. The contoured seal line 17 starts at the center of gravity of the front surface 2 or back surface 3, has a curvature 20 with a radius of R44, then extends to an angled seal line 21 and to a fold 22 at the top of the bottom surface.

[0111] A vertical sealing line 15 connects the front surface 2 to the rear surface 3. In the region of the bottom surface 4, a die cut (not shown) is placed in the bottom surface to create the vertical sealing line 15, so that the sealing coatings 9 of the front surface 2 and rear surface 3 have a contact surface for forming the seal.

[0112] Sealing lines 15, 16, and 17 have a width of 4 mm. The inner radius 23 at the transition from vertical sealing line 15 to horizontal sealing line and / or at the transition from contoured sealing line 17 to vertical sealing line 15 or horizontal sealing line 16 is R1. Additionally, preferably, the outer rounded corners 24 of the upright pouch have a radius R4.

[0113] To ensure increased stability, which is particularly advantageous when the upright pouch 1 is constructed from a mono-material material, a transition structure 18 is formed between the vertical sealing line 15 and the contoured sealing line 17.

[0114] In the embodiment shown, the insertion system 12 is formed from a combination of an opening 25 in the shape of a semicircular punch in the front face 2 and a strip 26 sealed between the front face 2 and the rear face 3 on the vertical sealing line 15. The strip 26 further has a sealing shape 29 adapted to the punch.

[0115] 3 shows a schematic diagram of the structure of the front surface 2 and back surface 3. A transparent outer coating 5 is placed on the outside of the stand-up pouch 1, on which a print 6 is applied using a reverse printing process. The inside of the stand-up pouch 1 is formed by a sealing coating 9. The outer coating 5 and the sealing coating 9 are each bonded to a functional coating 8 by an adhesive layer 7.

[0116] In this embodiment, the outer coating 5 is made of or comprises BOPP and has a thickness of 30 μm. The sealing coating 9 is made of or comprises cast PP and has a thickness of 80 μm. The functional coating 8 is made of (or comprises) BOPP and has a vapor-deposited aluminum layer, 16 μm thick, with a 24-hour coating density of 0.1 g / m². 2 Water vapor permeability of less than 0.1 cm in 24 hours 3 / m 2 It has an oxygen permeability of less than 1000 .mu.m.

[0117] 4 shows a schematic diagram of the structure of the bottom surface 4. An outer coating 10 and a sealing coating 11 are each bonded to a functional coating 8 by an adhesive layer 7. In this embodiment, the outer coating 10 is made of or comprises BOPP and has a thickness of 20 μm. The sealing coating 11 is made of or comprises cast PP and has a thickness of 60 μm. The functional coating 8 is made of (or comprises) BOPP, has a vapor-deposited aluminum layer, and has a thickness of 16 μm.

[0118] As previously mentioned, the present invention is not limited to stand-up pouches having an outer coating, a functional coating (if optionally provided), and a sealing coating, each of which consists of only one layer of material. At least one of the outer coating, sealing coating, and functional coating (if provided) can also be provided with multiple layers of material.

[0119] For example, in one embodiment, it can be provided that the outer coating comprises one or several oriented PP, in particular BOPP, layers according to the aforementioned embodiment of Figures 1 to 4. These layers can be, but need not be, of equal thickness, for example, it can be provided that the outer coating (front and / or back and / or bottom) comprises two oriented PP layers with the same layer thickness, two oriented PP layers with unequal layer thicknesses, or three or more oriented PP layers with the same layer thickness or at least partially different, in particular different in pairs.

[0120] It is also possible to provide that one or several layers of the outer coating do not consist of or contain oriented PP, but instead comprise, for example, non-oriented PP or consist of non-oriented PP. At least several of the layers of the outer coating can, for example, be co-extruded. Preferably, all layers of the outer coating are co-extruded together.

[0121] In one embodiment, it can be provided that the total thickness of the outer coating is 15 to 45 μm, in particular 20 to 30 μm, preferably 25 to 35 μm, in particular 18 or 20 or 24 or 28 or 30 or 32 or 34 μm. This thickness of the outer coating advantageously results in an advantageous stiffness, which can affect the standing ability of the stand-up pouch.

[0122] Providing the outer coating with the properties described herein results, firstly, in a reduction in the thickness of the material layers for the front and / or back and bottom surfaces, and therefore in a reduction in material usage, which has a beneficial impact on environmental compatibility. At the same time, the use of oriented PP, in particular BOPP, for example, for the outer coating results in high tear resistance and / or pouch shrinkage stability during sealing, since BOPP has a relatively high melting point of about 168°C and therefore undergoes little or no deformation at lower sealing temperatures. Additionally or alternatively, the use of the respective material can ensure high resistance to puncture (e.g., as measured according to ISO EN14477), which can improve the durability of the pouch.

[0123] A layer can be added towards the internal volume of the upright pouch, which can optionally include a printing ink and can also be designed as an adhesive layer (also the first adhesive layer) based on, for example, a PUR-based adhesive. The printing ink can be incorporated into the adhesive or can be provided as an additional layer. This layer can, for example, have a layer thickness of less than 10 μm, preferably less than 6 μm, for example 5 μm, 4 μm, or 3 μm, and can optionally be provided to connect to an optionally provided functional coating on the front and / or back and / or bottom of the upright pouch. Alternatively, this layer (if no functional coating is provided) can also form a direct connection with the sealing coating on the front and / or back and / or bottom of the upright pouch.

[0124] In embodiments where a functional coating according to the aforementioned embodiments is provided, the functional coating can be applied to a further layer (adhesive layer) facing away from the outer coating. A first adhesive layer connects the outer coating and the functional coating to each other. The functional coating can, for example, consist of or include one or more oriented and / or non-oriented PP layers. At least one of these layers is preferably metallized, and it is particularly preferred that one of the oriented PP layers, in particular the BOPP layer, is metallized. This layer can be, but is not required to be, the outermost layer of the functional coating toward the outer coating. For example, this layer can also be arranged between two other layers (in a three-layer system of the functional coating) without metallization, each of which can consist of or include oriented PP.

[0125] Overall, the thickness of the functional coating is preferably less than the thickness of the outer coating, in particular less than 90% or less than 75% of the thickness of the outer coating, preferably less than 60% of the thickness of the outer coating. For example, if the outer coating has a thickness of 30 μm, the thickness of the functional coating can be provided to be 12, 14, 16, 18, or 20 μm. If the outer coating has a thickness of 22 μm or 20 μm, the thickness of the functional coating can be provided to be 17 μm, 15 μm, or 13 μm.

[0126] These metallized functional coatings, which are thinner than the outer coating, can provide improved barrier properties, e.g., hermeticity with respect to the diffusion of gases such as oxygen, with reduced material usage.

[0127] If a functional coating is provided, another layer (second adhesive layer) containing, for example, a PUR-based adhesive can be applied to the functional coating toward the internal volume of the upright pouch. Depending on the composition of the overlying layer, this layer can also contain one or more printing inks toward the outer surface of the upright pouch, but this is not required. The thickness of the second adhesive layer can correspond to the thickness of the first adhesive layer between the outer coating and the optionally provided functional coating, and can be, for example, equal in size, smaller, or larger. If the layer thickness of the first adhesive layer between the outer coating and the functional coating is, for example, 3 to 5 μm (e.g., 4 μm), the layer thickness of the second adhesive layer adjacent to the functional coating toward the sealing cover can be, for example, 2 to 4 μm, preferably 3 μm.

[0128] If no functional coating is provided, the second adhesive layer may be the only layer of the stand-up pouch that incorporates the printing ink.

[0129] A sealing coating adjoins this second adhesive layer in the direction of the internal volume of the upright pouch. As mentioned above, the sealing coating can consist of a single PP layer, optionally containing an additive such as titanium dioxide (TiO2). Alternatively, however, it can also be provided that the sealing coating comprises at least two, preferably at least three or more, PP layers. These layers can have the same layer thickness or different thicknesses. Furthermore, all these layers can have the same structure (for example, consisting of a PP homopolymer or PP copolymer, or BOPP or CPP, optionally containing an additive such as TiO2). Alternatively, the individual layers of the sealing coating can be constructed differently.

[0130] For example, it can be provided that the outermost layer of the sealing coating facing towards the outer coating comprises a PP homopolymer and optionally TiO2, and that the layer adjacent to it in the direction towards the internal volume of the upright pouch consists of or comprises a PP copolymer, or alternatively consists of or comprises BOPP or CPP, again adjacent to which can be further PP homopolymer (optionally comprising TiO2) and / or PP copolymer and / or BOPP and / or CPP layers.

[0131] In order to favorably influence the rigidity of the stand-up pouch and at the same time ensure a high level of hermeticity of the stand-up pouch, it can be provided that at least two PP homopolymer layers with TiO2 are arranged directly adjacent to or consecutive to one another in the direction of the outer coating of the stand-up pouch. The at least two PP homopolymer layers can be the two outermost layers of the sealing coating (towards the outer coating) and / or the two innermost layers of the sealing coating (towards the internal volume of the stand-up pouch).

[0132] The layer thicknesses of the individual layers of the seal coat need not be equal, but these layers together preferably have a layer thickness of 30 to 110 μm, particularly preferably 80 to 100 μm, and particularly preferably 85 to 95 μm. Generally, the thickness of the seal coat can be 100% to 300% of the thickness of the outer coat. In embodiments where the thickness of the outer coat is 35, 30, or 20 μm, the thickness of the seal coat can be 90 μm, 85 μm, 76 μm, 68 μm, or 55 μm accordingly. This thickness is particularly advantageous in terms of the low permeability to be achieved, for example, to oxygen or CO2, through the front, back, or bottom of the stand-up pouch, while at the same time being sufficiently small to minimize material usage.

[0133] The layers of the seal coat can have the same thickness. However, for example, when the seal coat has three layers, it is particularly provided that the middle layer has the largest thickness and is made of or contains, for example, a PP homopolymer with TiO2. The layer thickness of this middle layer can be more than 50%, for example, 75%, or even up to 65% of the total thickness of the seal coat. For example, if the seal coat is 90 μm thick, the layer thickness of the middle layer in a three-layer system can be, for example, 45-57 μm, particularly 49, 50, 51, or 52 μm. Other combinations are also possible. For example, if the seal coat is 68 μm thick, the layer thickness of the middle layer can be, for example, 30, 35, 38, or 42 μm. For example, if the seal coat is 76 μm thick, the layer thickness of the middle layer can be, for example, 40, 42, or 45 μm. For example, if the seal coat is 55 μm thick, the layer thickness of the middle layer can be, for example, 20 μm, 25 μm, 30 μm, or 32 μm.

[0134] The second layer, facing the outer coating when viewed from the intermediate layer, can have a thickness of up to 60%, preferably at most 45%, of the thickness of the intermediate layer. For example, this layer can have a thickness of 12 to 25 μm, in particular 20 to 23 μm, for example 12, 14, 16, 18, 20, or 22 μm, and consist of or contain a PP homopolymer with titanium oxide. This layer thickness can generally be combined with any of the layer thicknesses of the intermediate layer described above.

[0135] A third layer (e.g., another PP homopolymer or copolymer layer, optionally containing TiO) can be arranged on the side of the intermediate layer facing the interior volume of the upright pouch, and its thickness can be equal to or less than that of the outer layer of the sealing coating. In particular, the thickness of this inner layer can be preferably less than 50%, particularly preferably less than 40%, of the thickness of the intermediate layer. If the intermediate layer has a thickness of, for example, 50 μm, the thickness of the inner layer can be, for example, less than 25 μm, preferably between 20 μm and less than 10 μm, for example, 16, 17, or 18 μm. Other thicknesses, such as 11 μm or 14 μm, can also be provided, and all of the aforementioned thicknesses for the third layer can be combined with all embodiments of the intermediate and second layers of the functional coating.

[0136] Providing different layers, which may have different layer thicknesses, in the seal coating according to the above-described embodiments has a beneficial effect on the sealing result and tightness of the upright pouch. Providing three layers for the seal coating also makes it possible to adapt each individual layer to specific requirements, and providing the seal coating layers from the same material (PP) further ensures good recyclability and internal stability of the seal coating. Advantageously, the layer of the seal coating facing the functional coating can improve the adhesion properties of the seal coating to the functional coating. Advantageously, the intermediate layer of the seal coating can improve stability within the specified layer thickness range (see above) and / or have a higher melting point than the innermost layer of the seal coating to prevent excessive melting or liquefaction of the seal coating. On the other hand, the innermost layer of the seal coating can have a reduced melting temperature (e.g., 70°C to 110°C) and thus achieve a reliable seal, for example, with another inner layer of the seal coating on another surface of the upright pouch. The specified layer thickness ensures that the pouch surfaces are reliably connected without forming holes or leaks.

[0137] The described embodiments generally apply to the outer coating, functional coating and sealing coating on the front, back and bottom surfaces of the stand-up pouch.

[0138] Typically, however, because the front and back surfaces of an upright pouch are designed to stabilize the upright pouch and the bottom surface of the upright pouch contributes little, the total thickness of the bottom surface (including the outer coating, functional and seal coating, and any intermediate layers) can be less than the total thickness of the outer coating, functional and seal coating, and any intermediate layers for the front and back surfaces. For example, the thickness of the bottom surface can be at most 80% of the thickness of the front or back surface, or at most 75% of the thickness of the front / back surface.

[0139] If the total thickness of the outer coating, functional coating and sealing coating and any intermediate adhesive layers on the front or back surface is, for example, 129 μm, the total thickness of the bottom surface may be, for example, less than 100 μm, but preferably greater than 90 μm, in particular 93 to 97 μm, and particularly preferably 94, 95 or 96 μm.

[0140] In particular, when using the same layer structure, the outer coating can be configured to be thinner than the corresponding outer coating on the front or back side, for example, if the thickness of the outer coating on the front or back side is 30 μm, it can be only 18 μm, 19 μm, 20 μm, or 21 μm, but can otherwise include the layer structure described above.

[0141] The functional coating may also have a smaller thickness, although this is not required, and may have a thickness of only 15 μm where the front or back functional coating is, for example, 16, 17, or 18 μm thick.

[0142] The sealing coating can also optionally have a thickness less than the thickness of the front or rear surface, regardless of the thickness of the outer coating and any optional functional coatings. If the thickness of the sealing coating on the front or rear surface is, for example, about 80 μm, such as 76 μm, the thickness of the sealing coating on the bottom surface can be, for example, less than 60 μm, in particular 54, 55, or 56 μm.

[0143] A correspondingly smaller layer thickness can then be selected for the individual layers of this sealing coating. If the total layer thickness of the front and rear sealing coatings is 76 μm, with the individual layers having thicknesses of 18, 43, and 16 μm, respectively (for example, the three-layer structure described above), a total thickness of 55 μm can be provided for the bottom sealing coating, with the individual layers having the same layer structure as for the sides, but only having layer thicknesses of, for example, 14, 30, and 11 μm. Here, the layer structure can in particular be a three-layer structure with the properties specified above.

[0144] On the other hand, if the layer thickness of the front or back surface is e.g. 90 μm and is divided into a three-layer system with layer thicknesses of 22, 50 and 18 μm, and the structure is otherwise as described above, then a layer thickness of only 60-75, e.g. 65 or 67 or 68 or 70 μm, can be provided on the bottom surface, e.g. at least three of the layers on the bottom surface (see embodiment above) can have layer thicknesses of e.g. 16, 38 and 14 μm.

[0145] Although various embodiments of the outer coating, functional coating and sealing coating, and first and second adhesive layers have been described herein, all combinations of the individually designated layers of the respective outer coating, functional coating and sealing coating, and first and second adhesive layers are also expressly included.

[0146] The described layers can be used individually or in combination for stand-up pouches having an internal volume of at least 100 ml, or at least 200 ml, or at least 330 ml, or an intended fill of at least 100 ml, or 200 ml, or 330 ml of liquid. All described embodiments have advantageous stability and recyclability in this regard, while at the same time having high impermeability (including against the diffusion of gases such as oxygen). Any other volume is also possible. In particular, volumes of up to 500 ml, up to 1 liter, or up to 2 liters can be provided.

[0147] In the above-mentioned embodiments, embodiments for the materials of the bottom and sidewalls have been described. In an embodiment that can be provided in combination with all of the described embodiments, it is provided that the upright pouch is formed by joining three material surfaces, namely the front, back and bottom, which makes it possible to meet different requirements for each of the material surfaces.

[0148] It is particularly possible to provide that the total thickness of the bottom surface is smaller than the total thickness of the side surfaces (front and rear surfaces). In one embodiment, the total thickness of the side surfaces (front and / or rear surfaces) is 1.1 to 2 times greater than the total thickness of the bottom surface. This allows the pouch to be substantially stabilized by the rigidity of the side surfaces, thereby saving material while at the same time producing a stable, upright pouch.

[0149] Alternatively or additionally, it can be provided that the outer coating (on one or more of the sides and / or on the bottom) is formed from BOPP, and that the BOPP is formed so that it is stretched to more than 1.1 times and less than 2 times, in particular more than 1.2 times and less than 1.8 times. Within this range, sufficient flexibility of the outer coating is obtained, while at the same time sufficiently high stiffness and the lowest possible material usage are obtained.

[0150] In connection with these embodiments (also described above), or alternatively, it can be provided that the front and / or back and / or bottom surface has at least one functional coating disposed between the outer coating and the sealing coating, the functional coating comprising metallized BOPP, and the metallized BOPP is formed so as to be stretched more than 1.1 times and less than 2 times, particularly more than 1.2 times and less than 1.8 times. By providing such a functional coating, sufficient hermeticity and opacity can be achieved, while at the same time, sufficiently high rigidity of the functional coating and low material usage can be achieved.

[0151] It can further be provided that the sealing coating is formed from cast polypropylene (CPP) and that the CPP is formed so as to be stretched more than 3 times and less than 8 times, particularly more than 4 times and less than 7 times, thereby advantageously reducing the use of material in the sealing coating while at the same time ensuring that sufficient CPP is available for a reliable seal.

[0152] The factors stated so far for stretching the respective layers refer to the direction along the transport or machine direction. Across this direction, i.e., transverse to the transport direction, the stretch factor can be less than 1, in particular 0.2 to 0.8, preferably 0.3 to 0.8, for the outer coating and / or functional coating. For the seal coating, the factor in the transverse direction for compression can be 2 to 15, preferably 3 to 12.

Claims

1. A recyclable stand-up pouch for beverages (1), comprising: It is polypropylene-based, It has a front surface (2), a back surface (3) and a bottom surface (4), A stand-up pouch, wherein the front (2), the back (3) and the bottom (4) surfaces each have a transparent outer covering (5, 10) and a sealing covering (9, 11), A stand-up pouch, characterized in that the sealing covering (9, 11) has a greater thickness than the outer covering (5, 10).

2. 2. Stand-up pouch according to claim 1, characterized in that the sealing covering (9, 11) is made to be more than 2.00 times thicker than the outer covering (5, 10), preferably more than 2.25 times thicker, in particular more than 2.50 times thicker.

3. 3. Stand-up pouch according to claim 1 or 2, characterized in that the sealing coating (9, 11) is formed to be less than 6.50 times thicker than the outer coating (5, 10), preferably less than 6.25 times thicker, in particular less than 6.00 times thicker.

4. 4. A stand-up pouch according to any one of claims 1 to 3, wherein the sealing covering (9, 11) is formed to be 2 to 4 times or 2.5 to 3.5 times thicker than the outer covering (5, 10).

5. 5. Stand-up pouch according to any one of claims 1 to 4, characterized in that the front (2) and / or the back (3) and / or the bottom (4) face has at least one functional coating (8) arranged between the outer coating (5, 10) and the sealing coating (9, 11), the functional coating (8) having a thickness of less than 25 μm, preferably less than 20 μm, in particular less than 15 μm, and / or more than 6 μm, preferably more than 9 μm, in particular more than 12 μm.

6. 6. Stand-up pouch according to claim 5, characterized in that the functional coating (8) comprises a barrier layer and / or a metallized layer and / or a metal layer and / or at least one BOPP layer.

7. 7. Stand-up pouch according to claim 5 or 6, characterized in that the functional coating (8) comprises a vapor-deposited aluminium layer.

8. 8. Stand-up pouch according to any one of claims 1 to 7, characterized in that the outer covering (5) has a printing (6), preferably said printing (6) being applied as a reverse printing.

9. The upright pouch (1) has a width of 10 cm when measured at 23°C and 0% RH. ３ / m ２ - Less than 5 cm ３ / m ２ ・Day・Less than bar, especially 0.1 cm ３ / m ２ 9. A stand-up pouch according to any one of claims 1 to 8, characterized in that it has an oxygen transmission rate of less than 1 / 2 day / bar.

10. The upright pouch (1) is subjected to a test of 10 g / m2 for 24 hours in accordance with ASTM D6701-01. ２ less than 5 g / m ２ less than 0.1 g / m ２ 10. The stand-up pouch according to claim 1, characterized in that it has a water vapor permeability of less than 0.1%.

11. 11. Stand-up pouch according to any one of claims 1 to 10, characterized in that the front surface (2) and / or the rear surface (3) has a thickness of less than 180 μm, preferably less than 160 μm, in particular less than 140 μm, and / or more than 80 μm, preferably more than 90 μm, in particular more than 100 μm.

12. 12. Stand-up pouch according to any one of claims 1 to 11, characterized in that the thickness of the front surface (1) and / or the thickness of the back surface (3) is more than 1.1 times, preferably more than 1.2 times, in particular more than 1.3 times, greater than the thickness of the bottom surface (4) and / or is less than 2.0 times, preferably less than 1.8 times, in particular less than 1.6 times, greater than the thickness of the bottom surface (4).

13. 13. The stand-up pouch according to any one of claims 1 to 12, wherein the thickness of the front surface (2) and / or the thickness of the back surface (3) is greater than the thickness of the bottom surface by more than 1.05 times and less than 1.5 times, or by more than 1.05 times and less than 1.3 times.

14. 13. A stand-up pouch according to any one of claims 1 to 12, characterized in that the outer covering (5, 10) is made from BOPP, which is formed so as to be stretched by more than 2.0 times, preferably more than 3.0 times, in particular more than 4.0 times, and / or is formed so as to be stretched by less than 7.0 times, preferably less than 6.5 times, in particular less than 6.0 times.

15. 15. A stand-up pouch according to any one of claims 1 to 14, wherein the outer covering is formed from BOPP, the BOPP being formed so as to be stretched by more than 1.1 times and less than 2 times, in particular by more than 1.2 times and less than 1.8 times.

16. 16. The stand-up pouch according to any one of claims 1 to 15, wherein the front (2) and / or the back (3) and / or the bottom (4) face has at least one functional layer arranged between the outer covering (5, 10) and the sealing covering (9, 11), the functional layer comprising metallized BOPP, the metallized BOPP being formed so as to be stretched more than 1.1 times and less than 2 times, in particular more than 1.2 times and less than 1.8 times.

17. 17. A stand-up pouch according to any one of claims 1 to 16, wherein the sealing cover is formed from cast polypropylene (CPP), and the cast polypropylene (CPP) is formed so as to be stretched more than 3 times and less than 8 times, in particular more than 4 times and less than 7 times.

18. 18. Stand-up pouch according to any one of claims 1 to 17, characterized in that the sealing covering (9, 11) is made from a multi-layer cast polypropylene covering.

19. 19. Stand-up pouch according to any one of claims 1 to 18, characterized in that the front (2) and / or the back (3) and / or the bottom (4) face exhibits a shrinkage of less than 2.5%, preferably less than 2.0%, in particular less than 1.5%.

20. 20. Stand-up pouch according to any one of the preceding claims, characterized in that the outer covering (5, 10) has a heat-resistant coating.

21. A method for making an upright pouch (1), comprising: - extruding said outer coating (5, 10) and said sealing coating (9, 11); adhesively bonding said outer coating (5, 10) to said sealing coating (9, 11); - welding said front surface (2) to said back surface (3) and said bottom surface (4) to form an upright pouch (1); A method comprising:

10. A method according to claim 1, wherein said sealing coating (9, 11) is formed to have a greater thickness than said outer coating (5, 10).

22. 21. Use of a stand-up pouch (1) according to any one of claims 1 to 20 as a fully recyclable disposable beverage packaging for hot fill.

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