Recyclable, polyethylene-based stand-up pouch

Abstract

The invention relates to a recyclable, polyethylene-based stand-up pouch (1) for beverages, having a front side (2), a rear side (3) and a bottom (4), wherein the front side (2), the rear side (3) and the bottom (4) each have a transparent outer layer (5, 10) and a sealing layer (9, 11), characterised in that the sealing layer (9, 11) has a greater thickness than the outer layer (5, 10).

Description

[0001] Recyclable stand-up pouch based on polyethylene

[0002] Description

[0003] The invention relates to a recyclable stand-up pouch for beverages having a front, a back and a base, wherein the front, the back and the base each have a transparent outer layer and a sealing layer.

[0004] Stand-up pouches are flexible packaging that can stand on their base and are typically used for powders, pastes, or ready-to-drink beverages. The bottom part of a stand-up pouch has a side gusset to ensure the pouch's stability.

[0005] In 1963, Doyen disclosed in patent DE 1 281 140 a bag with a base made of thermoplastic material, consisting of two film layers connected by a W-shaped inwardly folded base piece and welded together at their edges along the height of the bag by longitudinal welds.

[0006] Stand-up pouches (SUPs) were first manufactured around 60 years ago. Early designs used a laminate of one layer of polyethylene terephthalate (PET) and one layer of polyethylene (PE). An aluminum foil layer could optionally be sandwiched between the two. This type of design is still in commercial use, with a typical structure comprising a thin layer of approximately 12 μm of PET, a layer of approximately 8 μm of aluminum foil, and a thicker layer, approximately 80 μm thick, of polyethylene. One problem with this SUP design is that the pouches are very difficult or impossible to recycle due to the different construction materials.

[0007] It is now known to produce a recyclable stand-up pouch that consists of at least 95% polyethylene, as many recycling plants are able to recycle co-extruded or laminated film with at least 95% polyethylene as pure polyethylene material.

[0008] EP 3 256 317 B1 discloses a laminated structure made of polymeric material, the laminated structure comprising an outer web comprising a first A-layer and a second A-layer comprising polyethylene selected from the group consisting of LLDPE, MDPE, and HDPE, and an inner web comprising a first B-layer in contact with the outer web, the first B-layer comprising polyethylene selected from the group consisting of LLDPE and MDPE, and a third B-layer comprising a sealant composition, with the proviso that the outer web is laminated to the inner web and the laminated structure is printed at the interface between the outer layer and the inner layer. The HDPE, MDPE, LLDPE, and the sealant polyethylene together constitute at least 95% by weight of the polymeric material used to produce the laminated structure, and furthermore, the first A-layer comprises an HDPE composition.

[0009] However, polyethylene has several disadvantages that make it difficult to construct a stand-up pouch made solely from polyethylene. For example, while high-density polyethylene (HDPE) offers the rigidity required for a stand-up pouch structure, HDPE's physical and optical properties, such as haze and gloss, are comparatively unfavorable. In contrast, linear low-density polyethylene (LLDPE) offers excellent physical and optical properties but poor rigidity. The physical and optical properties of medium-density polyethylene (MDPE) generally fall between those of HDPE and LLDPE. Accordingly, a simple stand-up pouch design made from PE lacks the combination of optical and rigid properties offered by the state-of-the-art design combining a layer of PET and a layer of PE.Plastic packaging films still commonly used today are film laminates made of different layers. These typically combine layers of different plastics. Packaging is often produced with visible printing on the outside. The printing is applied to a layer of the film laminate that is suitable for printing, e.g., a layer of biaxially oriented polypropylene or polyethylene terephthalate.

[0010] The printing process most commonly used for high-quality packaging is a serial printing process, such as gravure or flexographic serial printing. In a serial printing process, the individual printing units are separate from one another, and the film web to be printed passes through a dryer and several deflection rollers before the next color is applied to extend the drying time. However, with certain films, particularly PE films, this leads to problems with register accuracy or unacceptable print images. PE films and PE film laminates are therefore usually printed using the flexographic printing process in satellite design on so-called central printing cylinder machines. There, the film web to be printed is guided between the individual printing units on a central cylinder and only then is it dried.Intermediate drying after inking also takes place on the central cylinder, with the film web also being guided on the central cylinder during drying. However, this generally does not allow for complete drying between printing units due to the very short drying path. Therefore, the print quality with a satellite flexographic printing process is not as high as with a serial printing process.

[0011] For high-quality packaging laminates, packaging manufacturers usually require the film laminate to be printed using a serial printing process, such as gravure printing or (UV) flexo serial printing, due to the achievable print image. Therefore, such film laminates have traditionally used a PET or PP film web as the printed film web, which is then laminated to a low-temperature sealable material, such as PE film, to form the film laminate.

[0012] For cost reasons, film laminates for the packaging industry should be as thin as possible. This requires that the individual film layers be as thin as possible, in accordance with their function. The problem with a polyethylene monolaminate is that PE films with a technically relevant thickness of less than 40 μm are usually only partially printable to the required quality on in-line printing systems, and especially not using gravure or flexographic in-line printing processes.

[0013] At the same time, the way plastic, and thus also packaging film, is currently produced and disposed of can be optimized. As part of its "Green Deal," the European Union aims to reduce the amount of plastic waste going to landfills. By 2030, 55% of plastic packaging waste is to be recycled.

[0014] To meet the challenges of recycling, packaging design must become increasingly sustainable. This can be achieved, for example, by implementing more monomaterial constructions. The challenge here lies in achieving the very different properties of a package with just one recyclable monomaterial construction, which was previously achieved by combining different plastic layers with different material bases.

[0015] At the same time, the same mechanical properties of a multi-material construction cannot be achieved, creating new challenges for the design and construction of the stand-up pouch, affecting its dimensional stability and stability. Due to the changed material properties, it is challenging to achieve the exact, familiar and characteristic pouch shape.

[0016] In addition, commercially available stand-up pouches for beverages are filled and vacuum-sealed at temperatures exceeding 85°C. A monomaterial pouch construction must be able to maintain the pouch's shape and the seal, even under hot-fill conditions.

[0017] The object of the present invention is to provide a recyclable stand-up pouch which is designed as a monomaterial construction and ensures the familiar, typical shape of a stand-up pouch. In addition, the stand-up pouch should meet the requirements of the Plastics Pact 2025 and be fully recyclable. The stand-up pouch should protect the pouch contents from spoilage, ensure a long and tasty shelf life, and at the same time have a high barrier against the penetration of oxygen and water vapor. The stand-up pouch should be sealable and should also be suitable for hot filling of beverages. Furthermore, the sides of the stand-up pouch should be able to be printed with precise repeating. The flexible pouch packaging should be harmless to health and ecologically sustainable. Furthermore, the stand-up pouch should have a pleasant feel.

[0018] This object is achieved according to the invention by a recyclable stand-up pouch, a method, and a use according to the independent main claims. Preferred variants can be found in the dependent claims, the description, the exemplary embodiment, and the drawings.

[0019] According to the invention, the sealing layer is thicker than the outer layer. The outer layer forms the outer skin of the stand-up pouch and is transparent to reveal and protect the reverse-printed image.

[0020] Advantageously, the outer layer is made of a monoaxially oriented polyethylene (MDO PE), wherein the MDO PE is stretched by a factor of more than 2.0, preferably by a factor of more than 3.0, in particular by a factor of more than 4.0, and / or by a factor of less than 7.0, preferably by a factor of less than 6.5, in particular by a factor of less than 6.0. The advantages of the outer layer in terms of good stiffness and good toughness are thus ideally realized, whereby a print image with precise repeating can be applied even to a particularly thin outer layer.

[0021] Ideally, the thickness of the outer layer is more than 10 pm, preferably more than 14 pm, in particular more than 18 pm and / or less than 30 pm, preferably less than 26 pm, in particular less than 22 pm. The outer layer is thus designed to be as thin as possible while simultaneously ensuring sufficient stability, allowing the typical stand-up pouch shape to be achieved.

[0022] Ideally, the outer layer is multi-layered, wherein the outer layer has more than two layers, preferably more than three layers, in particular more than four layers.

[0023] For example, the outer layer contains more than 92.5% polyethylene by weight, preferably more than 95% by weight, and especially more than 97.5% by weight. This extremely high polyethylene content enables the stand-up pouch to be constructed as a monomaterial and makes it recyclable. The inside of the stand-up pouch is formed by a sealing layer.

[0024] In a particularly advantageous variant of the invention, the sealing layer is formed from a multilayer cast polyethylene layer. This sealing layer is particularly advantageous for the sealing process.

[0025] Ideally, the thickness of the sealing layer is more than 40 pm, preferably more than 55 pm, in particular more than 70 pm and / or less than 120 pm, preferably less than 100 pm, in particular less than 80 pm. The sealing layer is thus extremely thin and simultaneously ensures the sealing capability of absolutely tight seal seams.

[0026] Ideally, the sealing layer is multi-layered, wherein the sealing layer has more than two layers, preferably more than three layers, in particular more than four layers.

[0027] For example, the sealing layer has a polyethylene content of more than 92.5 wt.%, preferably more than 95 wt.%, in particular more than 97.5 wt.%. This extremely high polyethylene content enables the monomaterial construction of the stand-up pouch and ensures its recyclability.

[0028] The outer layer and the sealing layer are preferably connected with an adhesive layer and are made up to form rectangular front and back sides. The base of the stand-up pouch can in principle have the same structure. In an advantageous variant, the thicknesses of the outer layer and the sealing layer of the base are somewhat thinner. The front, back and base of the stand-up pouch are connected by a sealing structure. The rectangular front and back sides are placed on top of one another and a W-shaped folded base is inserted between them. In a particularly advantageous variant of the invention, the sealing layer is more than 2.00 times thicker than the outer layer, preferably more than 2.75 times thicker, in particular more than 3.50 times thicker. This achieves the advantageous sealability of the stand-up pouch designed as a monomaterial construction.

[0029] Ideally, the sealing layer should be less than 6.0 times thicker than the outer layer, preferably less than 5.0 times thicker, and especially less than 4.0 times thicker than the outer layer. A sealing layer that is too thick compared to the outer layer could adversely affect the sealing properties.

[0030] Heat sealing is the standard method for creating seams in flexible stand-up pouches. The purpose of sealing is to ensure that sealable materials are joined together in a completely sealed and secure manner. Sealing specifically means impermeability to microbiological contamination as well as the penetration of oxygen and water vapor, which are known to cause spoilage of food and hygroscopic products in a stand-up pouch. The special thickness and design of the cast polyethylene sealing layer, as well as the sealing process itself, achieve the required absolute tightness of the stand-up pouch.

[0031] Heat sealing involves using two heated bars that apply pressure to the materials to be sealed while simultaneously conducting heat to the interface, melting the materials and forming a bond. The pressure ensures good contact between the materials and assists the penetration of the molten, viscous materials at the interface, forming a permanent, tight bond after cooling. Sealability is defined as the successful and time-efficient process of joining the front, back, and base to form a stand-up pouch. The stand-up pouch according to the invention features a sophisticated monomaterial construction based on polyethylene. Ideally, the stand-up pouch contains more than 92.5% by weight of polyethylene, preferably more than 95% by weight, and in particular more than 97.5% by weight.This outstanding monomaterial construction based on polyethylene provides excellent recyclability and thus complies with the requirements of the EU's "Green Deal." The stand-up pouch according to the invention, with its thickness ratio of the sealing layer to the outer layer, realizes very different features that could previously only be achieved through a combination of materials. At the same time, it is particularly sustainable, particularly due to its recyclability.

[0032] In a highly advantageous variant of the invention, the front and / or back and / or bottom have at least one functional layer arranged between the outer layer and the sealing layer. The functional layer is designed as an ideal barrier against oxygen and water vapor. At the same time, it offers additional protection for the pouch against puncture.

[0033] Ideally, the functional layer has a thickness of less than 25 pm, preferably less than 20 pm, in particular less than 15 pm and / or more than 6 pm, preferably more than 9 pm, in particular more than 12 pm.

[0034] Preferably, the functional layer comprises a barrier layer and / or a metallized layer and / or a metal layer and / or a vapor-deposited aluminum layer and / or at least one MDO PE layer.

[0035] In a cost-effective variant, the functional layer is designed as an MDO PE layer. A preferably ultra-thin aluminum layer is vapor-deposited onto the MDO PE layer. At the same time, the layer is prepared for adhesive lamination. This layer provides an exceptional barrier to oxygen, flavors, and aromas, and has an excellent water vapor barrier.

[0036] For example, the functional layer contains more than 92.5 wt.% polyethylene, preferably more than 95 wt.%, and in particular more than 97.5 wt.%. This extremely high polyethylene content enables the stand-up pouch to be designed as a monomaterial and ensures its recyclability.

[0037] In an advantageous variant of the invention, the MDO PE layer is vapor-deposited, preferably vacuum-deposited. A metal layer, in particular an aluminum and / or aluminum oxide layer, is preferably vapor-deposited. The thickness of the metallized layer is more than 10 nm, preferably more than 15 nm, in particular more than 20 nm and / or less than 60 nm, preferably less than 50 nm, in particular less than 40 nm.

[0038] Ideally, the metallized layer contributes to a favorable reflection of the UV light that hits the stand-up pouch from the outside.

[0039] In an alternative variant, the functional layer is designed as a barrier layer. The barrier layer is preferably applied between the sealing layer and the outer layer by plasma-assisted chemical vapor deposition.

[0040] The deposited barrier layer can preferably be formed from a silicon oxide. Alternatively or additionally, the barrier layer can be formed from an amorphous carbon layer. Furthermore, the barrier layer could be made from a ceramic coating and / or an aluminum oxide.

[0041] Preferably, the thickness of the alternative barrier layer is 2 to 8 nm. In a further alternative variant of the invention, the barrier layer can be designed as an ethylene vinyl alcohol and / or polyvinyl alcohol layer.

[0042] In a completely different alternative of the invention, the barrier layer can be in the form of a printed primer layer. This can be made, for example, of an ethylene-vinyl alcohol and / or a polyvinyl alcohol layer and / or a carboxyl-containing polymer. The barrier layer can be applied either to the inside or outside of the outer layer or to the outside of the sealing layer.

[0043] Preferably, the front side has an insertion area for inserting a drinking straw.

[0044] The stand-up pouch for beverages includes an insertion system for inserting a drinking straw. The drinking straw comprises a tubular straw element that includes a straw wall, an inlet to be placed inside the stand-up pouch, and an outlet to be placed outside the stand-up pouch.

[0045] The stem element can be manufactured using an injection molding process. The cross-section of the stem element can be round, oval, triangular, or square.

[0046] Ideally, a packaging sleeve for the straw element, which ensures its hygienic closure until the beverage is consumed, is made of a thin, transparent polyethylene layer. This polyethylene layer is affixed to the stand-up pouch in such a way that removal is very difficult. The packaging sleeve is easy to open to remove the straw element. The strong bond between the packaging sleeve and the stand-up pouch ensures effective and shared recycling. A serial printing process, such as gravure or flexographic serial printing, is typically used for high-quality packaging.

[0047] The outer layer is printed, preferably using reverse printing. The outer layer is printed to identify the brand and beverage ingredients, as well as to create the visual impression of the beverage bag.

[0048] A frequently used method for printing the outer layer is flexographic inline printing. This is a direct letterpress printing process, also known as a web-fed rotary printing process. The flexible printing plates, made of photopolymer or rubber, are used in combination with low-viscosity printing inks. The raised areas of the printing forme carry the image. The advantages lie in the cost-effectiveness due to the utilization of a large printing width and high printing speed, as well as the availability of inexpensive printing inks. The printing tools, photopolymer printing plates, and / or laser-engraved elastomer sleeves are readily available. Large print runs can be produced cost-effectively with flexographic printing.

[0049] The gas permeability of films is determined according to DIN EN ISO 2556 under atmospheric pressure. A film test specimen separates two chambers, one of which contains the test gas at atmospheric pressure, while the other, with a known initial volume, is evacuated of air until a near vacuum is reached. 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 increase in the second chamber with a manometer. Advantageously, the stand-up pouch has an oxygen transmission rate of less than 10 cm³. 3 / m 2 ■ Day ■ bar, preferably less than 5 cm 3 / m 2 ' Day ■ bar, especially less than 0.1 cm 3 / m 2 - day ■ bar, measured at 23 °C and 0% r. H. This means that drinks can be stored for a long time in the stand-up pouch without artificial preservatives.

[0050] The determination of water vapor permeability is carried out according to DIN 53116 using a gravimetric measuring method. A test container filled with a desiccant is sealed with a pouch film sample and exposed to a defined test climate. The amount of water permeating through the sample is determined by weighing. The water quantity can be in the range of 1 - 200 g / (m 2 ■ d) be detected. The detection limit also depends on the sample properties and the sample thickness.

[0051] Ideally, the Stand Up Pouch has a water vapor permeability of less than 10 g / m 2 , preferably less than 5 g / m 2 , in particular less than 0.1 g / m 2 in 24 hours according to ASTM D6701-01. This allows hot-filled liquids to be stored in the stand-up pouch without artificial preservatives and protected from spoilage for a significant period of time.

[0052] The measurement of the thickness of the film was determined in accordance with DIN 53370 and given as an average value. In an advantageous variant of the invention, the front side and / or the back side has a thickness of less than 160 pm, preferably less than 140 pm, in particular less than 120 pm and / or more than 80 pm, preferably more than 90 pm, in particular more than 100 pm. This makes the stand-up pouch particularly thin and therefore also lightweight, while still having excellent resistance. In an advantageous variant, the thickness of the front side and / or the thickness of the back is more than a factor of 1.1, preferably more than a factor of 1.2, in particular more than a factor of 1.3 greater than the thickness of the base and / or less than a factor of 2.0, preferably less than a factor of 1.8, in particular less than 1.6 greater than the thickness of the base.This means that the use of materials can be kept to a minimum.

[0053] In a favorable variant of the invention, at least one layer of the multilayer cast polyethylene layer has a proportion of TiCh.

[0054] The filler content can be determined using well-known measurement methods such as ashing. A sample with a known initial weight is heated to a temperature at which the polymer thermally decomposes but the filler does not. A temperature of 560 °C, for example, has proven effective for this purpose. The sample weight is then measured again. The polymer content per square meter can be calculated from the difference between the initial and final weight.

[0055] As an alternative to ashing, a TGA measurement is possible, in which the weight of a sample is continuously measured during heating. This test method can also clearly differentiate between polymer and filler and allows the polymer content of the film to be determined.

[0056] In a favorable variant of the invention, at least one layer of the multilayer cast polyethylene layer comprises an inorganic filler, wherein the proportion of filler is more than 0.5 wt.%, preferably more than 1.0 wt.%, in particular more than 1.5 wt.%.

[0057] Ideally, the filler is titanium dioxide, which allows for a white layer with favorable opacity. In a particularly advantageous variant, the filled layer of the sealing layer has an opacity according to DIN 53416 of more than 55%, preferably more than 70%, especially more than 85%. This advantageously absorbs the light that hits the stand-up pouch from the outside, thus favorably supporting the shelf life of the beverage in the stand-up pouch.

[0058] In a preferred variant, the innermost layer of the multilayer cast polyethylene layer in contact with the beverage is free of pigments, in particular free of titanium dioxide. This effectively prevents contact or even contamination of the beverage with pigment.

[0059] In a favorable variant of the invention, the sealing layer comprises a portion of an antistatic agent. The antistatic agent can be selected from the group 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.

[0060] Preferably, the sealing layer contains an antistatic agent in an amount of 0.01 to 2% by weight of the layer, preferably 0.1 to 1.5% by weight and most preferably 0.4 to 1.0% by weight.

[0061] Since the layers are often stored in stacks or rolls before assembly and sealing into stand-up pouches, migration of the antistatic agent could occur. Therefore, the outer layer can be treated with an antistatic agent as a preventative measure.

[0062] A particular challenge lies in the dimensional accuracy of the front and back, which are essentially made of the same material, especially the same roll material. The future front and back are printed simultaneously onto a roll of outer layer material and bonded to the functional layer and the sealing layer. Only through the special selection of defined polyethylene materials and the special manufacturing process is it possible to produce such a dimensionally accurate outer layer that can be printed with very tight tolerances. The outer layer is characterized by a particularly small deviation in thickness per unit area.

[0063] Preferably, the front and back sides form a mirror-symmetrical structure with respect to the different layers. In an alternative variant of the invention, the layers can also be arranged differently.

[0064] In an alternative variant of the invention, the functional layer can in principle also be connected to the outer layer and the sealing layer via thermal lamination.

[0065] Shrinkage of plastics refers to a change in the dimensional stability of test specimens at temperatures T > TG (amorphous) or T > Ts (semi-crystalline), which is caused by the recovery of molecular orientations and the relaxation of residual stresses. These orientations arise as a result of the processing process (extrusion, injection molding, or deep drawing) and are therefore dependent on processing parameters. These parameters include the temperature of the mold and the melt, the injection and holding pressure, the flow path length, and the cooling gradient of the film layers.

[0066] In a favorable 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 monomaterial design, allowing for very precise printing. This dimensional stability is particularly advantageous during hot filling.

[0067] In a favorable variant, the stand-up pouch, particularly the outer layer and / or the functional layer, has a barrier against UV light in the wavelength range of 250-800 nm. The transmission is less than 5%, preferably less than 3%, in particular less than 1%.

[0068] Overall, it's not trivial to meet all of these specifications with a monomaterial construction. This can be achieved through a specific combination of selected, monomaterial individual layers and a special manufacturing process. However, this can also be achieved using individual layers comprising one or more layers of the same material (e.g., polyethylene). Furthermore, the stand-up pouch can also be frozen and can withstand the associated mechanical stresses.

[0069] In a further variant of the invention, the outer layer has a heat-resistant coating. This coating can, for example, be in the form of a layer made of a mixture of an amorphous polyamide and a semi-crystalline polyamide. Such a coating offers an improved gas, particularly oxygen, barrier and, in further embodiments, can be provided with a thin metal or metal oxide layer, e.g., by means of a vacuum deposition process.

[0070] Advantageously, the heat-resistant coating increases the seal resistance of the outer layer and thus also of the entire stand-up pouch compared to a pure polyethylene outer layer by more than 10 °C, preferably by more than 20 °C, in particular by more than 25 °C. In other embodiments, the outer layer of the outer layer consists of at least 90 wt.%, preferably more than 95 wt.%, of a mixture of an amorphous polyamide and a semi-crystalline polyamide. The outer layer of the outer layer preferably has a thickness of 2 to 4 μm. In this embodiment, the outer layer of the outer layer is particularly advantageous in the production of the stand-up pouch because it has a significantly lower tendency to adhere to the sealing jaws through which the heat is conducted to form the sealing lines on the front, back and bottom of the stand-up pouch.It should be noted that the polyamide, in its manageable proportions relative to the total mass of the stand-up pouch, has proven to be fully compatible with the concept of material recycling.

[0071] Alternatively, or in addition, a heat-resistant varnish can be applied to the outer layer. This provides extra protection during sealing, ensuring it retains its dimensional stability and attractive appearance.

[0072] The front, back, and bottom of the stand-up pouch are connected by a sealed structure. The rectangular front and back panels are placed on top of each other, with a W-shaped folded bottom inserted between them. The bottom preferably has perforations to create the vertical sealing lines.

[0073] The spatial terms refer to a filled and displayed stand-up pouch.

[0074] Preferably, the horizontal sealing lines and the gradient sealing lines are created first to connect the base to the front and back. The gradient sealing line overlaps the horizontal sealing line, preferably curves with a radius of R44 starting from the center of gravity of the front and back, and then transitions into diagonal sealing lines extending to the upper base fold. Advantageously, the vertical sealing lines are created last, also encompassing the folded base in the area of ​​the punching.

[0075] Ideally, the seal lines should be 4 mm wide. The inner radii at the transitions between the vertical and horizontal seal lines and / or at the transitions between the seal lines and the vertical or horizontal seal lines should be R1. Furthermore, the rounded corners on the outside of the stand-up pouch should preferably have a radius of R4.

[0076] In a further development of the invention, the vertical sealing lines have a width in the range of 4.1 to 5 mm.

[0077] To ensure increased stability, which is particularly advantageous through the realization of a monomaterial construction of the stand-up pouch, a transition structure is formed between the vertical sealing lines and the rising sealing lines, which have a gradient.

[0078] The sealed transition structure is characterized by an enlarged sealing surface, giving the stand-up pouch a secure standing behavior even in the monomaterial construction and increasing the strength of the sealed seams, even under the effects of hot filling into the stand-up pouch. The transition structure also features a special shape.

[0079] In a particularly advantageous variant of the invention, the transition structure has a vertical extension in relation to the total length of the vertical sealing lines 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%. Ideally, the transition structure has a width in relation to the vertical sealing line, wherein the width is more than 5%, preferably more than 10%, in particular more than 15% and / or the width is less than 40%, preferably less than 35%, in particular less than 30%.

[0080] In a particularly preferred variant of the invention, the transition structure has the contour of a circle, an ellipse, a lens, a long circle, a rectangle, or a square. The transition structure can overlap with the vertical sealing line and / or the sealing line with a gradient, whereby only part of the contour is additionally visible in the sealing structure. The transition structure ensures the typical, bulbous shape of the stand-up pouch despite the altered mechanical properties of the monomaterial construction.

[0081] Advantageously, the transition structure has a circular segment with a radius R which is oriented orthogonally to the circular segment, wherein the radius is more than R2, preferably more than R3, in particular more than R4 and / or the radius is less than R30, preferably less than R25, in particular less than R20.

[0082] The radius of the circle segment can point outwards or inwards, based on a top view of the Stand Up Pouch.

[0083] Preferably, the front and back of the stand-up pouch are connected by vertical sealing lines.

[0084] Horizontal seal lines and gradient seal lines are preferred for connecting the front or back to the base of the stand-up pouch. Ideally, the base is connected to the front and back via vertical seal lines and / or horizontal seal lines and / or ascending seal lines.

[0085] In a particularly advantageous variant of the invention, the vertical sealing lines have at least one reinforcing structure for waisting the pouch.

[0086] The reinforcement structure is preferably arranged in the upper half of the stand-up pouch.

[0087] In a particularly preferred variant of the invention, the reinforcing structure has the contour of a circle, an ellipse, a lens, a long circle, a rectangle, or a square. The transition structure can overlap with the vertical sealing line.

[0088] In an advantageous variant of the invention, the sealed stand-up pouch is filled with a beverage having a temperature of over 85°C. Immediately after the filling process, the stand-up pouch is sealed with a horizontal ultrasonic weld.

[0089] Ideally, in addition to the ultrasonic welding, a horizontal sealing line is created to permanently close the stand-up pouch.

[0090] According to the invention, the method for producing a stand-up pouch comprises extruding the outer layer and the sealing layer, bonding the outer layer to the sealing layer, and joining the front to the back and bottom with a sealing structure to form a stand-up pouch. Ideally, the sealing layer is not bonded directly to the outer layer. In a favorable variant of the invention, a functional layer is additionally bonded between the outer layer and the sealing layer. The sealing layer is formed with a greater thickness than the outer layer.

[0091] According to the invention, a stand-up pouch is used as a fully recyclable, polyethylene-based disposable beverage packaging for hot filling of beverages.

[0092] Further advantages and features of the invention will become apparent from the description of an embodiment with reference to drawings and from the drawings themselves.

[0093] This shows

[0094] Fig. 1 a perspective view of a stand-up pouch,

[0095] Fig. 2 shows the seal structure,

[0096] Fig. 3 is a schematic representation of the structure of the front and back,

[0097] Fig. 4 is a schematic representation of the floor structure.

[0098] Fig. 1 shows a perspective view of a recyclable stand-up pouch 1 for beverages with a front side 2, a back side, and a base 4. Arranged on the front side 2 is an insertion device 12 into which a drinking straw 13 is inserted.

[0099] Fig. 2 shows a representation of the sealing structure of the stand-up pouch 1. For this purpose, the front side 2, the back side 3, and the bottom 4 of the stand-up pouch are connected by a sealing structure 14. For this purpose, a W-shaped folded bottom 4 is inserted between the rectangular front side 2 and the rectangular back side 3.

[0100] The horizontal sealing lines 16 and the sealing lines with a gradient 17 connect the base 4 with the front side 2 and the back side 3. The sealing line with a gradient 17 overlaps with the horizontal sealing line 16 in the lower center of the front side 2 and the back side 3. The sealing line with a gradient 17, starting from the center of gravity of the front side 2 or back side 3, has a curve 20 with a radius of R44 and then extends into oblique sealing lines 21 that extend to the upper base fold 22.

[0101] The vertical sealing lines 15 connect the front side 2 with the back side 3. In the area of ​​the bottom 4, punchings (not shown in the figure) are arranged in the bottom to create the vertical sealing lines 15, whereby the sealing layers 9 of the front side 2 and the back side 3 find a contact surface to form the seal.

[0102] Sealing lines 15, 16, and 17 have a width of 4 mm. The inner radii 23 at the transitions between the vertical sealing line 15 and the horizontal sealing line and / or at the transitions between the sealing lines with a line 17 and the vertical sealing line 15 or the horizontal sealing line 16 are R1. Furthermore, the rounded corners 24 on the outside of the stand-up pouch have a radius of R4.

[0103] To ensure increased stability, which is particularly advantageous when the stand-up pouch 1 is constructed from a monomaterial, a transition structure 18 is formed between the vertical sealing lines 15 and the sealing lines with a profile 17. In the embodiment shown, the insertion system 12 is formed from the combination of an opening 25 in the form of a semicircular cutout in the front side 2 and the strip 26 sealed between the front side 2 and the back side 3 via the vertical sealing line 15. The strip 26 also has a sealing shape 29 adapted to the cutout.

[0104] Fig. 3 shows a schematic representation of the structure of the front side 2 and the back side 3. A transparent outer layer 5 is arranged on the outside of the stand-up pouch 1, to which a print 6 is applied using a counter-printing process. The inside of the stand-up pouch 1 is formed by a sealing layer 9. The outer layer 5 and the sealing layer 9 are each bonded to a functional layer 8 by an adhesive layer 7.

[0105] In this embodiment, the outer layer 5 consists of an MDO PE and has a thickness of 20 μm. The sealing layer 9 is made of a cast PE and has a thickness of 75 μm. The functional layer 8 is made of a metallized and oriented PE and has a thickness of 20 μm, a water vapor permeability of less than 0.1 g / m 2 in 24 h and an oxygen permeability rate of less than 0.1 cm 3 / m 2 in 24 hours.

[0106] Fig. 4 shows a schematic representation of the structure of the base 4. The outer layer 10 and the sealing layer 11 are each bonded to a functional layer 8 by an adhesive layer 7. In this embodiment, the outer layer 10 consists of an MDO PE and has a thickness of 20 μm. The sealing layer 11 is formed from a cast PE and has a thickness of 75 μm. The functional layer 8 is formed from a metallized oriented PE and has a thickness of 20 μm.

[0107] In the embodiments described so far, the outer layer, the sealing layer, and the functional layer have been described essentially as homogeneous layers (monomaterial layers) consisting of or comprising a layer of PE. However, the invention also provides for embodiments in which at least one of these layers (outer layer, sealing layer, and functional layer) can comprise more than one material layer. The following embodiments can be provided for each of the layers (outer layer, sealing layer, and functional layer) of both the side surfaces 2, 3 (front and back) and the bottom surface or bottom 4.

[0108] In one embodiment, one of the layers, such as the outer layer, comprises or includes one or more, for example, 2 or 3 or 4 layers of PE. In particular, one or more of these layers can consist of PE or comprise PE. Furthermore, one or more of these layers can comprise HDPE or LDPE. It can also be provided that one of the layers, such as the outer layer, has one or more layers comprising PE, one or more layers comprising HPDE, and / or one or more layers comprising LDPE.

[0109] The PE layers (including PE, HDPE and LDPE) can be co-extruded to produce the corresponding layer, which can improve the stability of the respective surface (such as the side surface or the bottom surface).

[0110] It can further be provided that a first layer with characteristic properties (such as color or barrier properties with respect to the diffusion of liquids and / or gases such as CO2 or oxygen) is applied to the side of the respective layer facing away from and / or towards the interior volume of the container, for example the outer layer. This layer can be vapor-deposited, rolled on, or printed on, for example. The layer can, for example, comprise or consist of aluminum and / or TiCh and / or color pigments and / or EvOH (ethylene-vinyl alcohol copolymer). Alternatively or additionally, a further layer with characteristic properties (such as color or barrier properties with respect to the diffusion of liquids and / or gases such as CO2 or oxygen) can also be provided between one or more layers of the respective layer of the back or front side or the base.Analogous to the layer with characteristic properties already described, this further layer can comprise aluminum and / or TiCh and / or color pigments and / or EvOH (ethylene-vinyl alcohol copolymer).

[0111] The first layer and the further layer with characteristic properties can, if provided, be identical or different. For example, the first layer can be arranged on the side of the outer layer facing away from or toward the interior volume and can comprise EvOH or aluminum, and a further layer can be arranged between two adjacent layers (such as an HPDE layer and a PE layer or between two PE layers) and can also comprise EvOH and / or aluminum and / or TiO2. Alternatively, the first layer can comprise color pigments.

[0112] Furthermore, it can be provided that one of the layers, for example the outer layer, comprises one or more connecting layers. For example, it can be provided that a connecting layer, for example based on PE, is arranged between one of the PE layers (PE, HDPE, LDPE) and a first layer and / or a further layer with characteristic properties in order to realize a reliable connection between the respective PE layer and the layer with characteristic properties.

[0113] Thus, in one embodiment, it can be provided that one of the layers (in particular the outer layer), viewed from the internal volume of the stand-up pouch, has at least two layers of polyethylene or even more layers of polyethylene (for example, three layers or four layers of polyethylene), wherein at least one, preferably all of the layers consist of or comprise either PE or EDPE, HDPE, or LDPE. It can also be provided that a mixture of at least one layer of PE, one layer of HDPE, and one layer of LDPE is present, or that any number of layers of PE, HDPE, and LDPE is present.

[0114] The individual layers do not all have to be the same thickness. For example, the innermost layer (as viewed from the internal volume of the container) of the outer layer can be half as thick as the immediately following layer. This layer can be the same thickness as the subsequent layer or layers. For example, the innermost layer can have a layer thickness of 1 μm to 5 μm, or 2 to 4 μm, or 3 μm, with at least one of the outermost layers having a thickness of 4 to 12 μm, preferably 5 to 10 μm, preferably 6 μm.

[0115] The outermost polyethylene layer can be followed by an adhesive layer, on which a layer with characteristic properties as described above can be arranged. This layer can comprise, for example, aluminum or EvOH and can be thicker or thinner than the underlying PE layers (for example, 1 μm or 2 μm thinner or thicker than the underlying layer).

[0116] In a further embodiment, at least one of the layers, in particular the functional layer, can also comprise several layers of material, which do not all have to be of the same design, but can be.

[0117] For example, the layer, in particular the functional layer, can comprise one or more PE layers, which can consist of either PE, HDPE, or LDPE, or can also be mixtures of PE, HDPE, or LDPE layers. The number of layers is not limited. Thus, two, three, four, or five or more layers of PE and / or LDPE and / or HDPE can be present.

[0118] Furthermore, the layers, in particular the functional layer, can comprise a metallized layer. The metallized layer can, for example, be arranged such that it is arranged on the outermost layer of the functional layer facing the outer layer and / or on the outermost layer of the functional layer facing the sealing layer and / or is arranged between intermediate layers of the functional layer.

[0119] This layer with characteristic properties can, for example, comprise or consist of EvOH and / or aluminum and / or titanium oxide. Furthermore, this layer can, for example, be a layer comprising PE with a metallization that, for example, consists of or comprises aluminum. Alternatively or additionally, color pigments can also be provided in this layer.

[0120] Furthermore, the layer, in particular the functional layer, can comprise one or more layers of polypropylene (PP). For example, a polypropylene layer can be provided as the outermost layer of the functional layer toward the outer layer and / or toward the sealing layer. Alternatively or additionally, the PP layer can also be arranged between different layers of the layer, in particular the functional layer.

[0121] The individual layers of the layer, in particular the functional layer, do not have to be the same thickness. They can vary as desired in terms of their layer thickness, whereby it can be provided that one or more of the layers have a layer thickness that is up to 100% greater than the layer thickness of the layer with the smallest layer thickness. For example, one or more layers can have a layer thickness of 1 to 5 μm, in particular 2 to 4 or 3 μm, and at least one of the layers of the layer, in particular the functional layer, can have a layer thickness of at least twice this, for example 4, 6, 8, 10, or 12 μm. This layer can serve to reinforce the layer and thus advantageously influence the stability of the stand-up pouch.

[0122] The connection between the layer, in particular the functional layer, and the previously described embodiments, in particular the outer layer, can be ensured by a layer comprising at least one adhesive and optionally further elements such as color pigments or printing inks.

[0123] In one embodiment, for example, it can be provided that, viewed from the internal volume of the stand-up pouch, the layer, in particular the functional layer, has a first layer made of PE or PP, in particular PP. One or more layers made of PE (PE, HDPE, LDPE) can follow this. This layer can be followed by one, two or three or four or five, preferably three to five, for example four layers of PE. Using four layers as an example, it can be provided that all of these layers consist of or comprise PE or all of these layers of HDPE or all of these layers of LDPE. Alternatively or additionally, it can be provided that at least one of the layers (for example the outermost layer or the innermost layer) consists of a different PE class than the other layers.For example, the outermost layer can be made of or comprised of HDPE, LDPE, or MDPE, while the remaining layers can be made of or comprised of a different composition, in particular HDPE or LDPE. Similar configurations are also applicable to more or fewer PE layers.

[0124] Alternating PE compositions along the layering is also conceivable. For example, a first layer can comprise HDPE or LDPE, the subsequent layer LDPE or HDPE, a subsequent layer HDPE or LDPE, and the subsequent layer HDPE, LDPE, or MDPE. Other combinations are also conceivable.

[0125] The outermost PE layer, as seen from the interior of the stand-up pouch, with characteristic properties can have a greater layer thickness than at least one of the underlying layers. For example, this layer can have a layer thickness of 10 to 30 μm or a layer thickness of 15 to 25 μm, in particular a layer thickness of 18 to 22 μm. This allows, for example, the barrier properties or the coloring properties of this layer to be reliably achieved.

[0126] In a further embodiment, it can be provided that one of the layers, in particular the sealing layer, consists of several layers of polyethylene and in particular a mixture of polyethylene with, for example, metallic or inorganic or organic components or comprises such layers.

[0127] In particular, it can be provided that the sealing layer comprises two or three or more layers based on PE, wherein at least one of the layers comprises MDPE and / or LLDPE and contains admixtures (for example 1% or 2% or 5% of the total mass of the layer) of, for example, metallic or inorganic components, such as, for example, titanium oxide or the like.

[0128] The layers of the sealing layer can in particular be designed identically, for example all based on MDPE and / or all based on LLDPE and / or all based on a mixture of LLDPE and MDPE. Mixtures with HDPE and / or LDPE are also conceivable. Analogous to the embodiments described so far, it can be provided that one or more layers with characteristic properties are arranged in the layer, in particular the sealing layer. For example, it can be provided that a layer with characteristic properties, for example comprising titanium oxide or aluminum, is arranged on the innermost layer as viewed in terms of the internal volume of the stand-up pouch, in particular the PE layer, and / or a corresponding layer is arranged on the outermost layer of the layer, in particular the functional layer, or a corresponding layer is arranged between at least two adjacent PE layers of the layer. However, this is not mandatory.

[0129] The layer thicknesses of the individual layers of the layer can be the same or different. In particular, it can be provided that one of the layers is up to 50% or up to 75% thicker than the thinnest of the layers in the layer. For example, the innermost layer can have a layer thickness of 10 to 30 pm, in particular 15 to 25 pm and particularly preferably 19, 20 or 21 pm. The following layer can, for example, have a layer thickness between 20 and 60 pm, in particular between 30 and 40 pm and preferably 32 or 33 or 34 or 35 or 36 pm. The adjoining layer can have a layer thickness corresponding to the first layer or be slightly thicker (for example 22 pm instead of 21 pm) or slightly thinner (for example 19 pm instead of 20 pm). The layer thicknesses can differ from each other in pairs by up to 20% or by up to 15% or by up to 10%.

[0130] The described values ​​of the respective layer thicknesses can all be combined with each other.

[0131] The embodiments described so far have been described regardless of whether the respective layer is a layer on the back or front side, or a layer on the bottom of the stand-up pouch. Although the design of the layers for the sealing layer, the functional layer, and the outer layer are particularly preferred (see above), the layer structures as described above are applicable to all layers, and the invention is not limited with regard to the combination of layers with the layer structures described above.

[0132] In principle, these embodiments are applicable to all embodiments of the front, back, and bottom of the stand-up pouch. However, in a preferred embodiment, the material thickness of one of the layers, for example, the sealing layer, if it is to be used as the front or back of the stand-up pouch, can be slightly thicker (for example, up to 5%, up to 10%, or up to 20%) than the corresponding layer of the bottom.

[0133] For example, it can be provided that the sealing layer consists of or comprises two or more PE layers, as described in previous embodiments, wherein a layer thickness of between 70 and 85 μm, in particular between 75 and 80 μm and in particular 77, 78 or 79 μm is provided for the side surface. This results in high rigidity. For the base, a smaller layer thickness can be provided for the same layer, for example from 70 to 80 μm, in particular 75 to 78 and, for example, 76 or 77 μm. The thickness of the layer can be adjusted by selecting the layer thicknesses of the individual layers of this layer.

[0134] The described embodiments of the individual layers of the stand-up pouch and the layers intended for these layers can all be combined with one another. In particular, the invention is not limited to specific layer thicknesses of individual layers in combination with specific layer thicknesses of other layers. The specified layer thicknesses of the layers contribute to the stability and tightness, as well as the recyclability of the stand-up pouch within the meaning of the invention.

[0135] While all combinations of layer thicknesses, number of layers, and material composition as described above can be provided within the meaning of the present disclosure, further preferred embodiments will be described below. These are not to be understood as limiting either the invention as a whole or possible combinations of the embodiments described above.

[0136] As already described, the stand-up pouch comprises at least one outer layer 5, 10 and one sealing layer 9, 11, wherein optionally a functional layer 8 can be provided between the outer layer and the sealing layer.

[0137] In one embodiment, it can be provided that the outer layer consists of PE or at least comprises PE in a mass fraction of at least 75%, preferably at least 95%. The outer layer can in particular comprise oriented PE (OPE), preferably biaxially oriented PE (BOPE) or monoaxially oriented PE (MOPE). Alternatively or additionally, the outer layer can also comprise hard PE (HDPE) and / or linear low-density polyethylene (LLDPE) and / or medium-density polyethylene (MDPE). As already described, the outer layer can be single-layered or multi-layered (for example comprising 2, 3, 4 or more layers of PE according to the material variants just described).

[0138] Regardless of the material choice (but in combination with any mentioned PE material embodiment), the outer layer can have a layer thickness between 10 and 30 μm, preferably between 15 and 25 μm, especially between 18 and 24 μm. The specified layer thicknesses can ensure sufficient stability and tear resistance, especially when using OPE (BOPE or MOPE), while simultaneously using minimal material.

[0139] As already described, the sealing layer has a greater layer thickness than the outer layer, which is preferably a factor of 2 to 4 greater than the layer thickness of the sealing layer. Thus, in one embodiment, the sealing layer can have a layer thickness of 20 to 160 μm, preferably between 50 and 100 μm, particularly preferably between 70 and 90 μm (for example, between 73 and 85 μm).

[0140] The sealing layer can be made entirely of PE, for example, OPE (BOPE and / or MOPE), and can be a single-layered structure. However, as already described, the sealing layer can also be multi-layered and comprise one of the combinations of layers and materials described above. Combinations of LLDPE and MDPE may be particularly preferred here. This can further improve the tear resistance of the pouch material and simultaneously ensure that the sealing layer can reliably seal the stand-up pouch when the sealing layer or, in general, the multi-layered base material of the stand-up pouch is sealed.

[0141] In a particularly preferred embodiment, it is provided that a melting temperature of the outer layer is greater than a melting temperature of the sealing layer, wherein the melting temperature of the outer layer is greater than 110°C, particularly preferably between 120 and 220°C and particularly preferably between 130 and 200°C.

[0142] In contrast, the melting temperature of the sealing layer to effect a sealing process can be between 80°C and 140°C, particularly preferably between 80°C and 110°C. If the material of the sealing layer is provided accordingly, this can, on the one hand, seal the stand-up pouch without damaging the outer layer. On the other hand, these melting temperatures are high enough to enable hot filling of a product. To ensure sterility and thus a long shelf life of the product, liquids, especially sugar-containing liquids, are usually filled hot, preferably at temperatures above 60°C and below 90°C.If the melting temperature of the sealing layer for a stand-up pouch intended for hot filling of a product at a temperature T1 (in particular between 70°C and 87°C) is selected by selecting the material of the sealing layer so that the melting temperature is higher than the temperature T1 but lower than the melting temperature T2 of the outer layer, reliable sealing and, at the same time, a long shelf life of the product is ensured.

[0143] As already described, the sealing layer can also be multi-layered. In particular, the sealing layer can consist of or comprise 1 to 12 layers, preferably 2 to 10 layers or 3 to 9 layers (e.g., coextruded PE).

[0144] The outer layer and the sealing layer can be bonded together (provided no functional layer is provided between them). The adhesive layer can preferably have a layer thickness that is less than the layer thickness of the outer layer and the sealing layer. For example, the adhesive layer can have a layer thickness between 2 and 8 μm or between 3 and 7 μm (including all values ​​in between, in particular 3, 5, or 8 μm).

[0145] If a functional layer is additionally provided between the outer layer and the sealing layer, it can be bonded to both the sealing layer and the functional layer using an adhesive layer of the previously described embodiments. The functional layer can, in particular, consist entirely of PE with one or more metallic additives (e.g., TiO2 and / or aluminum and / or aluminum oxide). The PE can also be provided as oriented PE, for example, BOPE, MOPE, or as MDPE, LLDPE, or HDPE. Additives such as EvOH can also be provided (alternatively or in addition to the metallic additives).

[0146] Instead of (metallic) additives in the PE material of the functional layer, it can also be provided that the PE material is coated with the corresponding additive(s) (either on the surface facing the sealing layer or the functional layer).

[0147] In one embodiment, it can be provided that the functional layer has a layer thickness which is equal to the layer thickness of the outer layer or the layer thickness of the functional layer can differ from the layer thickness of the outer layer and can be, for example, 0.8 to 1.2 or 0.9 to 1.1 times the layer thickness of the outer layer.

[0148] One or more (at least partially) opaque layers can also be included as part of the sealing layer and / or as part of the functional layer. The opaque layer(s) can be white, for example. This creates a light barrier that prevents any deterioration of the product.

[0149] While the previous embodiments were generally described for the outer layer, the functional layer, and the sealing layer, it is understood that these embodiments can be provided for the front, the back, and the bottom of the stand-up pouch. In this case, the total thickness of the bottom can be smaller than the total thickness of the front and / or the back. For example, the thickness of the bottom can be at least 75%, or at least 85%, or at least 90% up to 99% of the total thickness of the front or back.

[0150] The total thickness of the material comprising the outer layer, the (optional) functional layer, and the sealing layer can preferably be between 80 and 150 μm, particularly preferably between 100 and 140 μm, and particularly preferably between 110 and 135 μm (for example 110, 120, or 130 μm), with the total thickness preferably being lower in the absence of a functional layer. The embodiments described here are applicable to stand-up pouches with an internal volume of at least 100 ml, or at least 200 ml, or at least 330 ml, or to stand-up pouches that are filled with a liquid volume of 200 ml or 330 ml. Any other volume is also possible. In particular, volumes of up to 500 ml, or up to 1 l, or up to 2 l can be provided.

Claims

Claims 1 . Recyclable stand-up pouch (1 ) for beverages based on polyethylene, with a front side (2), a back side (3) and a base (4), wherein the front side (2), the back side (3) and the base (4) each have a transparent outer layer (5, 10) and a sealing layer (9, 11 ), characterized in that the sealing layer (9, 11 ) has a greater thickness than the outer layer (5, 10).

2. Stand-up pouch according to claim 1, characterized in that the sealing layer (9, 11) is thicker than the outer layer (5, 10) by a factor of more than 2.00, preferably by a factor of more than 2.75, in particular by a factor of more than 3.

50.

3. Stand-up pouch according to one of claims 1 or 2, characterized in that the sealing layer (9, 11) is thicker than the outer layer (5, 10) by a factor of less than 6.0, preferably by a factor of less than 5.0, in particular by a factor of less than 4.

0.

4. Stand-up pouch according to one of claims 1 to 3, wherein the sealing layer (9, 11) is thicker than the outer layer (5, 10) by a factor of between 2 and 5 or between 3 and 4 or between 3.5 and 4.

5. Stand-up pouch according to one of claims 1 to 4, characterized in that the front side (2) and / or the back side (3) and / or the base (4) have at least one functional layer (8) which is arranged between the outer layer (5, 10) and the sealing layer (9, 11), the functional layer (8) having a thickness of less than 25 pm, preferably less than 20 pm, in particular less than 15 pm and / or more than 6 pm, preferably more than 9 pm, in particular more than 12 pm.

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

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

8. Stand Up Pouch according to one of claims 1 to 7, characterized in that the front side (2) has an insertion area (12) for Insertion of a drinking straw (13).

9. Stand-up pouch according to one of claims 1 to 8, characterized in that the outer layer (5) has a print (6) which is preferably applied as a reverse print.

10. Stand Up Pouch according to one of claims 1 to 9, characterized in that the Stand Up Pouch (1) has a Oxygen transmission rate of less than 10 cm 3 / m 2 ■ Day ■ bar, preferably less than 5 cm 3 / m 2 ■ day ■ bar, especially less than 0.1 cm 3 / m 2 ■ day ■ bar, measured at 23 °C and 0% r. H.

11. Stand-up pouch according to one of claims 1 to 10, characterized in that the stand-up pouch (1) has a water vapor permeability of less than 10 g / m 2 , preferably less than 5 g / m 2 , in particular less than 0.1 g / m 2 in 24 h according to ASTM D6701-01.

12. Stand-up pouch according to one of claims 1 to 11, characterized in that the front side (2) and / or the back side (3) has a thickness of less than 160 pm, preferably less than 140 pm, in particular less than 120 pm and / or more than 80 pm, preferably more than 90 pm, in particular more than 100 pm.

13. Stand-up pouch according to one of claims 1 to 12, characterized in that the thickness of the front side (2) and / or the thickness of the back side (3) is designed to be greater than the thickness of the base (4) by a factor of more than 1.1, preferably by a factor of more than 1.2, in particular by a factor of more than 1.3, and / or is designed to be greater than the thickness of the base (4) by a factor of less than 2.0, preferably by a factor of less than 1.8, in particular by a factor of less than 1.

6.

14. Stand-up pouch according to one of claims 1 to 13, characterized in that the outer layer (5, 10) is made of MDO PE, wherein the MDO PE is stretched by more than a factor of 2.0, preferably by more than a factor of 3.0, in particular by more than a factor of 4.0 and / or by less than a factor of 7.0, preferably by less than a factor of 6.5, in particular by less than a factor of 6.

0.

15. Stand-up pouch according to one of claims 1 to 14, characterized in that the sealing layer (9, 11) is formed from a multi-layer cast polyethylene layer.

16. Stand-up pouch according to one of claims 1 to 15, characterized in that the front side (2) and / or the back side (3) and / or the bottom (4) have a shrinkage of less than 2.5%. preferably less than 2.0%, in particular less than 1.5%.

17. Stand-up pouch according to one of claims 1 to 16, characterized in that the outer layer (5, 10) has a heat-resistant coating.

18. Method for producing a stand-up pouch (1) comprising the following steps: Extruding the outer layer (5, 10) and the sealing layer (9, 11), bonding the outer layer (5, 10) to the sealing layer (9, 11), welding the front side (2) to the back side (3) and the base (4) to a stand-up pouch (1), characterized in that the sealing layer (9, 11) is formed with a greater thickness than the outer layer (5, 10).

19. Use of a stand-up pouch (1) according to one of claims 1 to 17 as a fully recyclable disposable beverage packaging for hot filling.

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