Recyclable polypropylene-based stand-up pouch

Abstract

A recyclable polypropylene-based stand-up pouch (1) for drinks, having a front side (2), a rear side (3) and a base (4), wherein the front side (2), the rear side (3) and the base (4) each have a transparent outer layer (5, 10) and a sealing layer (9, 11), wherein the sealing layer (9, 11) has a greater thickness than the outer layer (5, 10).

Description

[0001] Recyclable stand-up pouch based on polypropylene

[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] Stand-up pouches known today are used in practice as mass-produced items, with the typical structure of such film packaging bags being known, for example, from EP 2 032 454 B1 and EP 2 364 848 B1. The material for the bag wall is often a laminated composite as a bag film with an inner film made of polyethylene (PE) and an outer film based on polyethylene terephthalate (PET) or biaxially oriented polypropylene (BO-PP). A print layer for such a laminated composite is applied to the inside of the contact surface either on the outer film or the inner film before the inner film is glued to the outer film and is then visible through the transparent outer film.

[0008] Such conventional film packaging bags are characterized by a particularly high-quality appearance and good functional properties. However, due to the lamination of the different polymer materials, pure plastic recycling is not possible. Therefore, such film packaging bags, as disposable items, are usually disposed of in landfills or, at best, incinerated after use, although thermal recycling is still possible.

[0009] 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.

[0010] 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 diverse properties of a package with only one recyclable monomaterial construction, which was previously achieved by combining various plastic layers with different material bases. Biaxially oriented polypropylene (BOPP) and monoaxially oriented polyethylene (MDO-PE) films, as well as cast polypropylene films, have been shown to offer good stiffness and toughness for use in stand-up pouches, while also being able to be made thin.

[0011] WO 2021 / 156898 discloses a stand-up pouch made from a biaxially oriented polypropylene (BOPP) film. The BOPP film comprises at least one core layer made of a polypropylene-based material, having an outer surface and an inner surface; an inner intermediate layer adjacent to the inner surface of the core layer and made of a polypropylene-based material or a polyethylene-based material; an inner skin layer adjacent to the inner intermediate layer and made of a polypropylene-based material or a polyethylene-based material; and an outer skin layer corresponding to the outer surface of the core layer.

[0012] 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 shape stability and stability. Due to the changed material properties, it is challenging to achieve the exact, familiar and characteristic pouch shape.

[0013] In addition, commercially available stand-up pouches for beverages are filled at temperatures above 85°C and sealed vacuum-tight. A monomaterial construction of the pouch must be able to guarantee the shape of the pouch and the execution of the closing seal even under hot-filling conditions. The object of the present invention is to provide a recyclable stand-up pouch that 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.The flexible pouch packaging should be safe for human health and environmentally sustainable. Furthermore, the stand-up pouch should have a pleasant feel.

[0014] 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.

[0015] According to the invention, the sealing layer has a greater thickness than the outer layer.

[0016] The outer layer forms the outer skin of the stand-up pouch and is transparent to reveal and protect the reverse-printed image.

[0017] Advantageously, the outer layer is formed from biaxially oriented polypropylene (BOPP), wherein the BOPP 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 rigidity and good toughness are thus ideally realized, allowing a print image with precise repeating to be applied even to a particularly thin outer layer.

[0018] In one embodiment, the sealing layer is designed to be either 2 to 4 times thicker or 2.5 to 3.5 times thicker than the outer layer. This achieves reliable sealing while using as little material as possible, while simultaneously ensuring sufficient pouch rigidity.

[0019] It can be provided that the outer layer is made of BOPP and that the BOPP is stretched by a factor of more than 1.1 and less than 2, in particular more than 1.2 and less than 1.8. This reduces the amount of material used while maintaining high flexibility and stability.

[0020] In one embodiment, it is provided that the front and / or the back and / or the base have at least one functional layer arranged between the outer layer and the sealing layer, wherein the functional layer comprises metallized BOPP and wherein the metallized BOPP is stretched by a factor of more than 1.1 and less than 2, in particular more than 1.2 and less than 1.8. This meets requirements regarding tightness and / or opacity while simultaneously using low material.

[0021] It can further be provided that the sealing layer is made of cast polypropylene (CPP) and that the CPP is stretched by a factor of more than 3 and less than 8, in particular more than 4 and less than 7. This ensures reduced material usage while simultaneously achieving a good sealing result. Ideally, the thickness of the outer layer is more than 5 μm, preferably more than 10 μm, in particular more than 15 μm and / or less than 45 μm, preferably less than 40 μm, in particular less than 35 μm. The outer layer is thus made as thin as possible while at the same time ensuring sufficient stability, whereby the typical stand-up pouch shape can 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 wt.% polypropylene, preferably more than 95 wt.%, and especially more than 97.5 wt.%. This extremely high polypropylene content enables the monomaterial construction of the stand-up pouch and ensures its recyclability.

[0024] The inside of the stand-up pouch is formed by a sealing layer.

[0025] In a particularly advantageous variant of the invention, the sealing layer is formed from a multilayer cast polypropylene layer. This sealing layer is particularly advantageous for a sealing process.

[0026] Ideally, the thickness of the sealing layer 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. The sealing layer is thus as thin as possible while simultaneously ensuring the sealability of absolutely tight seal seams. Ideally, the sealing layer is multi-layered, with the sealing layer having more than two layers, preferably more than three layers, in particular more than four layers.

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

[0028] The outer layer and the sealing layer are preferably bonded with an adhesive layer and assembled into rectangular front and back panels. The base of the stand-up pouch can, in principle, have the same structure. In a cheaper variant, 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 sealed structure. The rectangular front and back panels are placed on top of each other, with a W-shaped folded base inserted between them.

[0029] In a particularly advantageous variant of the invention, the sealing layer is thicker than the outer layer by a factor of more than 2.00, preferably by a factor of more than 2.25, in particular by a factor of more than 2.50. This achieves the advantageous sealing capability of the stand-up pouch, which is designed as a monomaterial construction.

[0030] Ideally, the sealing layer should be less than 6.50 times thicker than the outer layer, preferably less than 6.25 times thicker, and in particular less than 6.00 times thicker. A sealing layer that is too thick compared to the outer layer could adversely affect the sealing properties. Heat sealing is the usual method for creating seams in flexible stand-up pouches. The purpose of sealing is to create an absolutely tight, i.e., firm, sealable joint between sealable materials. Sealing specifically means impermeability to microbiological contamination as well as to the penetration of oxygen and water vapor, which are known to cause spoilage of food and hygroscopic contents in a stand-up pouch. The special thickness and design of the cast polypropylene sealing layer, as well as the sealing process itself, achieve the required, absolute tightness of the stand-up pouch.

[0031] Heat sealing uses 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 promotes the penetration of the molten, viscous materials at the interface, forming a permanent and tight seal 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.

[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 preferably glued 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] The stand-up pouch according to the invention reveals a sophisticated mono-material construction based on polypropylene. Ideally, the stand-up pouch has a polypropylene content of more than 92.5 wt.%, preferably more than 95 wt.%, in particular more than 97.5 wt.%. This outstanding mono-material construction based on polypropylene provides advantageous 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 and, at the same time, is particularly sustainable, particularly due to its recyclability.

[0035] Ideally, the functional layer comprises a barrier layer and / or a metallized layer and / or a metal layer and / or at least one BOPP layer.

[0036] In a cost-effective variant, the functional layer is made of BOPP. A wafer-thin aluminum layer is vapor-deposited onto the BOPP 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.

[0037] In an advantageous variant of the invention, the BOPP layer is vapor-deposited, preferably vacuum-deposited. In this case, a metal layer, in particular an aluminum and / or an 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. For example, the functional layer has a polypropylene content of more than 92.5 wt.%, preferably more than 95 wt.%, in particular more than 97.5 wt.%. This extremely high polypropylene content realizes the monomaterial construction of the stand-up pouch and establishes its recyclability.

[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 an alternative 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.

[0042] In a further alternative variant of the invention, the barrier layer can be designed as an ethylene vinyl alcohol and / or polyvinyl alcohol layer.

[0043] 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.

[0044] Preferably, the front side has an insertion system for inserting a drinking straw.

[0045] 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.

[0046] 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.

[0047] Ideally, a packaging sleeve for the straw element, which ensures its hygienic closure until consumption, is made of a thin, transparent polypropylene layer. This polypropylene layer is bonded 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 joint recycling.

[0048] The cross-sectional area of ​​the insert system and the cross-sectional area of ​​the straw element, taking into account the wall thickness of the straw wall, can be similar, whereby the cross-sectional area of ​​the insert area 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. A serial printing process, such as gravure or flexographic serial printing, is usually used as a printing process for high-quality packaging.

[0049] The outer layer has a print, preferably applied using reverse printing. The print can advantageously be applied as a translucent print or from the reverse side on the inside of the outer layer, thereby providing extra protection for the printed image on the outer layer. The outer layer is printed to identify the brand and beverage ingredients, as well as to create the visual impression of the beverage bag.

[0050] 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.

[0051] In an alternative variant of the invention, a print can also be applied to the functional layer and / or to a metallized layer.

[0052] 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.

[0053] Advantageously, the Stand Up Pouch has an 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. This means that drinks can be stored for a long time in the stand-up pouch without artificial preservatives.

[0054] 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.

[0055] 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 for a long time without the contents evaporating from the pouch.

[0056] The film thickness was measured according to DIN 53370 and reported as an average value. In an advantageous variant of the invention, the front and / or back side 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 makes the stand-up pouch particularly thin and therefore lightweight, while still offering excellent durability.

[0057] In a favorable variant, the thickness of the front 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 a factor of 1.6 greater than the thickness of the base. This means that the material used can be kept to a minimum. At the same time, the rigidity in the side surfaces required for the stable shape of the stand-up pouch can be ensured.

[0058] In a particularly advantageous variant of the invention, the sealing layer is formed from a multilayer cast polypropylene layer. This sealing layer is particularly well suited for a sealing process.

[0059] In a favorable variant of the invention, at least one layer of the multilayer cast polypropylene layer has a proportion of TiCh.

[0060] 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.

[0061] 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. In a favorable variant of the invention, at least one layer of the multilayer cast polypropylene layer comprises an inorganic filler, wherein the filler content is more than 0.5 wt. %, preferably more than 1.0 wt. %, in particular more than 1.5 wt. %.

[0062] Ideally, the filler is titanium dioxide, which allows a white layer with advantageous opacity to be achieved.

[0063] 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.

[0064] In a preferred variant, the innermost layer of the multilayer cast polypropylene 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.

[0065] A particular challenge lies in the dimensional accuracy of the front and back, which are essentially made of the same material, in particular the same roll material. The future front and back are printed simultaneously onto a roll of outer layer material and glued to the functional layer and the sealing layer. Only through the special selection of materials and the special manufacturing process is it possible to produce such a dimensionally accurate outer layer that can be printed with very small tolerances. The outer layer is characterized by a particularly small deviation in thickness per unit area. Preferably, the front and back form a mirror-symmetrical structure with regard to the different layers. In an alternative variant of the invention, the layers can also be arranged differently.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] In a favorable variant of the invention, the front, back and base of the stand-up pouch have a shrinkage of less than 2.5%, preferably less than 2.0%, in particular less than 1.5%. As a result, the front, back and base are particularly dimensionally accurate, even in the monomaterial construction, which enables very precise printing. This dimensional stability is particularly advantageous during hot filling. In a favorable variant, the stand-up pouch, in particular 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%.

[0071] Overall, meeting all of these specifications with a single-material construction is not trivial. This can only be achieved through a special combination of selected individual layers, either monomaterial or multi-layered, and a unique manufacturing process. Furthermore, the stand-up pouch can also be frozen and can withstand the associated mechanical stresses.

[0072] 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.

[0073] Advantageously, the heat-resistant coating increases the seal resistance of the outer layer and thus also of the entire stand-up pouch by more than 10 °C, preferably by more than 20 °C, in particular by more than 25 °C, compared to a pure polypropylene outer layer.

[0074] In other embodiments, the outer layer of the outer layer consists of at least 90 wt.%, preferably more than 95 wt.%, 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 is significantly less likely 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 the manageable proportions relative to the total mass of the stand-up pouch, has proven to be fully compatible with the concept of material recycling.

[0075] The front, back, and bottom of the stand-up pouch are connected by a sealed structure. The rectangular front and back 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.

[0076] The spatial terms refer to a filled and displayed stand-up pouch.

[0077] 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.

[0078] 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.

[0079] In a further development of the invention, the vertical sealing lines have a width in the range of 4.1 to 5 mm.

[0080] To ensure increased stability, which is particularly advantageous through the realization of a monomaterial construction or a layered structure of the individual layers of the stand-up pouch, a transition structure is formed between the vertical sealing lines and the rising sealing lines, which have a gradient.

[0081] 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.

[0082] 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%.

[0083] 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%.

[0084] 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 a portion 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.

[0085] 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.

[0086] The radius of the circle segment can point outwards or inwards, based on a top view of the Stand Up Pouch.

[0087] Preferably, the front and back of the stand-up pouch are connected by vertical sealing lines.

[0088] The horizontal sealing lines and the sealing lines with a gradient are preferably used to connect the front or back with the bottom of the stand-up pouch.

[0089] Ideally, the base is connected to the front and back via vertical seal lines and / or horizontal seal lines and / or rising seal lines.

[0090] In a particularly advantageous variant of the invention, the vertical sealing lines have at least one reinforcement structure for shaping the pouch. The reinforcement structure is preferably arranged in the upper half of the stand-up pouch.

[0091] 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.

[0092] In an advantageous variant of the invention, the sealed stand-up pouch is filled with a beverage at a temperature of up to 85°C. Immediately after the filling process, the stand-up pouch is preferably sealed with a horizontal ultrasonic seal. Alternatively, the stand-up pouch can also be sealed with a heat seal.

[0093] Ideally, in addition to the ultrasonic welding, a horizontal sealing line is created to permanently close the stand-up pouch.

[0094] According to the invention, the method for producing a stand-up pouch comprises extruding (or co-extruding or gluing if multiple layers are provided in the respective layer) the outer layer and the sealing layer, gluing the outer layer to the sealing layer, and connecting the front to the back and the base with a sealing structure to form a stand-up pouch. Ideally, the sealing layer is not glued directly to the outer layer. In a favorable variant of the invention, a functional layer is additionally glued between the outer layer and the sealing layer. The sealing layer is formed with a greater thickness than the outer layer.

[0095] According to the invention, a stand-up pouch is used as a fully recyclable, polypropylene-based disposable beverage packaging for hot-filling beverages. Further advantages and features of the invention will become apparent from the description of an exemplary embodiment with reference to the drawings and from the drawings themselves.

[0096] This shows

[0097] Fig. 1 a perspective view of a stand-up pouch,

[0098] Fig. 2 shows the seal structure and the insertion system,

[0099] Fig. 3 is a schematic representation of the structure of the front and back,

[0100] Fig. 4 is a schematic representation of the floor structure.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] To ensure increased stability, which is particularly advantageous through the realization of a monomaterial construction of the stand-up pouch 1, a transition structure 18 is formed between the vertical sealing lines 15 and the sealing lines with a course 17.

[0107] 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. Fig. 3 shows a schematic representation of the structure of the front side 2 and the back side 3. Arranged on the outside of the stand-up pouch 1 is a transparent outer layer 5, 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 connected to a functional layer 8 by an adhesive layer 7.

[0108] In this embodiment, the outer layer 5 consists of (or comprises) a BOPP and has a thickness of 30 μm. The sealing layer 9 is formed of (or comprises) a cast PP and has a thickness of 80 μm. The functional layer 8 is formed of (or comprises) a BOPP that has a vapor-deposited aluminum layer and has a thickness of 16 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.

[0109] Fig. 4 shows a schematic representation of the structure of the base 4. The outer layer 10 and the sealing layer 11 are each connected to a functional layer 8 by an adhesive layer 7. In this embodiment, the outer layer 10 consists of (or comprises) a BOPP and has a thickness of 20 μm. The sealing layer 11 is formed of (or comprises) a cast PP and has a thickness of 60 μm. The functional layer 8 is formed of (or comprises) a BOPP with a vapor-deposited aluminum layer and has a thickness of 16 μm.

[0110] As already described, the invention is not limited to a stand-up pouch with an outer layer, a functional layer (optionally provided), and a sealing layer, each consisting of only one material layer. Multiple material layers can also be provided in at least one of the outer layer, the sealing layer, and the functional layer (if provided). Thus, in one embodiment, the outer layer can comprise one or more layers of oriented PP, in particular BOPP, in accordance with the previously described embodiments in Figs. 1 to 4.These layers can, but do not have to, be of equal thickness and it can be provided, for example, that the outer layer (either the front and / or the back and / or the bottom) comprises two layers of oriented PP with the same layer thickness or two layers of oriented PP with unequal layer thickness or can comprise three or more layers of oriented PP with the same or at least partially different, in particular pairwise different, layer thicknesses.

[0111] It can also be provided that one or more layers of the outer layer do not consist of oriented PP or comprise oriented PP, but rather comprise or consist of unoriented PP, for example. At least some of the layers of the outer layer can be co-extruded, for example. Preferably, all layers of the outer layer are co-extruded together.

[0112] In one embodiment, the total thickness of the outer layer can be between 15 and 45 μm, in particular between 20 and 30 μm, preferably between 25 and 35 μm, in particular 18 or 20 or 24 or 28 or 30 or 32 or 34 μm. This thickness of the outer layer provides advantageous rigidity, which can advantageously influence the stability of the stand-up pouch.

[0113] The provision of an outer layer with the properties described here results, on the one hand, in a reduced thickness of the material layers for the front and / or back and the base and thus in reduced material usage, which has a positive effect on environmental compatibility. At the same time, the use of oriented PP, in particular BOPP, for the outer layer, for example, achieves high tear resistance and / or stability against shrinkage of the pouch during sealing, since BOPP has a comparatively high melting point of around 168°C and thus undergoes little to no deformation at lower sealing temperatures. Also, or alternatively, the use of appropriate materials can ensure high resistance to the formation of puncture holes (measured, for example, according to ISO EN 14477), which can improve the durability of the pouch.

[0114] In the direction of the internal volume of the stand-up pouch, a layer can be applied, which can optionally contain printing inks and can also be designed as an adhesive layer (also first adhesive layer), for example based on a PUR-based adhesive. The printing ink can be incorporated into the adhesive or provided as an additional layer. The layer can, for example, have a layer thickness of less than 10 μm, preferably less than 6 μm, for example 5 μm or 4 μm or 3 μm, and can optionally be provided for connection to an optionally provided functional layer of the front and / or the back and / or the bottom of the stand-up pouch. Alternatively, this layer (if the functional layer is not provided) can also form a direct connection to the sealing layer of the front and / or the back and / or the bottom of the stand-up pouch.

[0115] In embodiments in which a functional layer according to the preceding embodiments is provided, this can be applied to the side of the further layer (adhesive layer) facing away from the outer layer, wherein the first adhesive layer connects the outer layer and the functional layer to one another, and the functional layer can, for example, consist of or comprise one or more layers of oriented and / or non-oriented PP. Preferably, at least one of these layers is metallized, and particularly preferably one of the oriented PP layers, in particular a BOPP layer, is metallized. This layer can, but does not have to, be the outermost layer of the functional layer in the direction of the outer layer. For example, this layer can also (in a three-layer system of the functional layer) be arranged between two other layers without metallization, each of which can consist of or comprise oriented PP.

[0116] Overall, the thickness of this functional layer is preferably less than the thickness of the outer layer and in particular less than 90% or less than 75% of the thickness of the outer layer, preferably less than 60% of the thickness of the outer layer. For example, if the outer layer has a thickness of 30 μm, the thickness of the functional layer can be 12, 14, 16, 18, or 20 μm. If the thickness of the outer layer is 22 μm or 20 μm, the thickness of the functional layer can be 17 μm, 15 μm, or 13 μm.

[0117] With these metallized functional layers, which are thinner than the outer layer, improved barrier properties can be achieved with reduced material usage, for example with regard to impermeability to the diffusion of gases such as oxygen.

[0118] If the functional layer is provided, another layer (a second adhesive layer), comprising, for example, a PUR-based adhesive, can be applied to this in the direction of the internal volume of the stand-up pouch. Depending on the design of the overlying layers, this layer can also contain one or more printing inks towards the outer surface of the stand-up pouch, but this is not necessary. The thickness of the second adhesive layer can correspond to the thickness of the first adhesive layer between the outer layer and the optionally provided functional layer and can, for example, be the same, smaller, or larger. If the layer thickness of the first adhesive layer between the outer layer and functional layer is, for example, 3 to 5 μm (for example 4 μm), the layer thickness of the second adhesive layer adjoining the functional layer in the direction of the sealing layer can, for example, be 2 to 4 μm, preferably 3 μm.If no functional layer is provided, the second adhesive layer can be the only layer of the stand-up pouch in which printing inks are incorporated.

[0119] In the direction of the internal volume of the stand-up pouch, the sealing layer adjoins this second adhesive layer. This can, as described, consist of a single layer of PP, optionally comprising additives such as titanium oxide (TiO2). Alternatively, however, the sealing layer can also comprise at least two, preferably at least three or more layers of PP. These layers can have the same layer thickness or different thicknesses. Furthermore, they can all have the same structure (for example, consisting of PP homopolymer or PP copolymer, optionally with additives such as TiO2, or BOPP or CPP), or the individual layers of the sealing layer can also be designed differently.

[0120] Thus, it can be provided that an outermost layer of the sealing layer facing the outer layer comprises PP homopolymer and optionally TiO2, and a layer adjoining it toward the interior volume of the stand-up pouch consists of or comprises PP copolymer, or alternatively consists of or comprises BOPP or CPP. This can be followed by a further layer of PP homopolymer (optionally comprising TiO2) and / or PP copolymer and / or BOPP and / or CPP.

[0121] In order to advantageously influence the rigidity of the stand-up pouch and at the same time ensure that the stand-up pouch is highly leak-tight, it can be provided that at least two PP homopolymer layers with TiO2 are directly adjacent to one another or follow one another in the direction of the outer layer of the stand-up pouch. These can be the two outermost layers (in the direction of the outer layer) of the sealing layer and / or the two innermost layers (in the direction of the internal volume of the stand-up pouch) of the sealing layer. The layer thicknesses of the individual layers of the sealing layer do not have to be the same, but together they preferably have a layer thickness of between 30 and 110 μm, particularly preferably between 80 and 100, particularly preferably between 85 and 95 μm. In general, it can be provided that the thickness of the sealing layer is 100% to 300% of the thickness of the outer layer.In an embodiment in which the thickness of the outer layer is 35, 30, or 20 μm, the thickness of the sealing layer can be 90 μm, 85 μm, 76 μm, 68 μm, or 55 μm, respectively. This thickness is particularly advantageous with regard to the low permeability to be achieved, for example, for oxygen or CO2 through the front, back, or bottom of the stand-up pouch, while at the same time being sufficiently low to minimize material usage.

[0122] While the layers of the sealing layer can have the same layer thickness, it can be provided in particular that, for example, when the sealing layer is designed with three layers, the middle layer has the greatest layer thickness and consists of or comprises, for example, PP homopolymer with TiO2. The layer thickness of this middle layer can be more than 50%, for example 75% or up to 65% of the total thickness of the sealing layer. If the thickness of the sealing layer is, for example, 90 μm, the layer thickness of the middle layer in a three-layer system can be, for example, between 45 and 57 μm and in particular 49 or 50 or 51 or 52 μm. Other combinations are also conceivable here. If the thickness of the sealing layer is, for example, 68 μm, the layer thickness of the middle layer can be, for example, 30 or 35 or 38 or 42 μm.If the thickness of the sealing layer is 76 μm, the middle layer can have a thickness of 35, 40, 42, or 45 μm. If the thickness of the sealing layer is 55 μm, the layer thickness of the middle layer can be 20 μm, 25 μm, 30 μm, or 32 μm. The second layer, viewed from the middle layer towards the outer layer, can be up to 60%, preferably at most up to 45%, of the layer thickness of the middle layer. For example, this layer can have a layer thickness of between 12 and 25 μm, in particular between 20 and 23 μm, for example 12, 14, 16, 18, 20, or 22 μm, and can consist of or comprise PP homopolymer with titanium oxide. This layer thickness can in principle be combined with any of the layer thicknesses of the middle layer listed above.

[0123] On the side of the middle layer facing the internal volume of the stand-up pouch, a third layer can be arranged (for example a further PP homopolymer or PP copolymer layer, optionally with TiO2), the layer thickness of which can be the same as the outer layer of the sealing layer or less than this layer thickness. In particular, the layer thickness of this inner layer can preferably be less than 50%, particularly preferably less than 40% of the layer thickness of the middle layer. If the layer thickness of the middle layer is, for example, 50 μm, the layer thickness of the inner layer can be, for example, less than 25 μm, preferably less than 20 up to 10 μm, and for example 16 or 17 or 18 μm.Other layer thicknesses can also be provided, for example 11 pm or 14 pm, whereby all mentioned layer thicknesses for the third layer can be combined with all embodiments of the middle layer and the second layer of the functional layer.

[0124] The provision of a sealing layer with different layers, which can also have different layer thicknesses according to the above embodiments, has a beneficial effect on the sealing result and the tightness of the stand-up pouch. The provision of three layers for the sealing layer also allows the individual layers to be adapted to specific requirements, whereby the provision of the sealing layer layers from the same material (PP) can additionally ensure good recycling properties and internal stability of the sealing layer. For example, the layer of the sealing layer facing the functional layer can advantageously improve the adhesion properties of the sealing layer to the functional layer. The middle layer of the sealing layer can advantageously improve stability in the specified layer thickness ranges (see above) and / or have a higher melting point than the innermost layer of the sealing layer in order to prevent excessive melting or liquefaction of the sealing layer.The innermost layer of the sealing layer, however, can have a reduced melting temperature (e.g., between 70°C and 110°C), so that reliable sealing can be achieved, for example, with another inner layer of a sealing layer on another surface of the stand-up pouch. The specified layer thicknesses ensure reliable bonding of the pouch surfaces without the formation of holes or leaks.

[0125] The described embodiments generally apply to the outer layer, the functional layer and the sealing layer of both the front and the back as well as the bottom of the stand-up pouch.

[0126] However, since the front and back of the stand-up pouch are typically designed to stabilize the stand-up pouch, with the bottom of the stand-up pouch contributing less, the total thickness of the bottom (comprising the outer layer, the functional layer, and the sealing layer, as well as any intermediate layers) may be smaller than the total thickness of the outer layer, the functional layer, and the sealing layer, as well as any intermediate layers for the front and back. For example, the thickness of the bottom, compared to the thickness of the front or back, may be no more than 80% of the thickness of the front or back, or no more than 75% of the front-to-back.

[0127] If the total thickness of the outer layer, functional layer and sealing layer as well as any intermediate adhesive layers for the front or back is, for example, 129 μm, the total thickness of the base can be, for example, less than 100 μm, but preferably greater than 90 μm, in particular between 93 and 97 μm, particularly preferably 94 or 95 or 96 μm.

[0128] In particular, when using the same layer structure, the outer layer can be thinner than the corresponding outer layer of the front or back and, for example, with a thickness of the outer layer of the front or back of 30 pm, can be only 18 pm or 19 pm or 20 pm or 21 pm, but otherwise comprise the layer structure described above.

[0129] The functional layer can also, but does not have to, have a smaller thickness and can have a thickness of only 15 pm if the functional layer of the front or back side has a thickness of, for example, 16 or 17 or 18 pm.

[0130] The sealing layer can also optionally have a thickness less than the thickness of the front or back, independent of the thickness of the outer layer and the optionally provided functional layer. For example, if the thickness of the sealing layer of the front or back is approximately 80 μm, such as 76 μm, the thickness of the sealing layer of the base can be less than 60 μm, for example, 54, 55, or 56 μm.

[0131] In this case, a correspondingly lower layer thickness can be selected for the individual layers of this sealing layer. For a layer thickness of the sealing layer on the front or back of a total of 76 pm with individual layers each having a thickness of 18, 43 and 16 pm (three-layer structure, for example, as described above), a total thickness of 55 pm can be provided for the sealing layer of the base, whereby the individual layers can have the same layer structure as for the side surfaces, but only have a layer thickness of, for example, 14, 30 and 11 pm. The layer structure here can in particular be a three-layer structure with the properties stated above. If, on the other hand, the layer thickness of the front or back isRear side, for example, 90 pm with a division in a three-layer system with layer thicknesses of 22, 50 and 18 pm and otherwise the structure described above, a layer thickness of only 60 to 75, for example 65 or 67 or 68 or 70 pm can be provided for the floor, wherein, for example, at least three of the layers of the floor (see above embodiments) can have layer thicknesses of 16, 38 and 14 pm.

[0132] While various embodiments of the outer layer, the functional layer and the sealing layer as well as the first and second adhesive layers have been described here, any combination of the individually specified layers of the respective outer layer, functional layer and sealing layer as well as the first and second adhesive layers is expressly also included.

[0133] The described layers can be used individually or in combination for stand-up pouches with an internal volume of at least 100 ml, at least 200 ml, or at least 330 ml, or an intended filling of at least 100 ml, 200 ml, or 330 ml of liquid. All described embodiments exhibit advantageous stability and recyclability in this regard, while simultaneously exhibiting 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 l, or up to 2 l can be provided.

[0134] In the previous embodiments, implementations for the material of the base and the side walls were described. In one embodiment, which can be combined with all of the described embodiments, the stand-up pouch is formed by joining three material surfaces: a front, a back, and a base. This makes it possible to implement different requirements in each of the material surfaces.

[0135] In particular, it can be provided that the total thickness of the base is less than the total thickness of the side panels (front and back). In one embodiment, the total thickness of the side panels (front and / or back) is greater than the total thickness of the base by a factor of 1.1 to 2. This allows material to be saved while simultaneously producing a stable stand-up pouch, since the stability of the pouch is essentially achieved by the rigidity of the side panels.

[0136] Alternatively or additionally, it can be provided that the outer layer (of one or more of the side surfaces and / or the base) is made of BOPP, and wherein the BOPP is stretched by a factor of more than 1.1 and less than 2, in particular more than 1.2 and less than 1.8. In this range, sufficient flexibility of the outer layer is achieved while simultaneously achieving sufficiently high rigidity with the lowest possible material usage.

[0137] In connection with these embodiments (as already described above) or alternatively, it can also be provided that the front side and / or the back side and / or the base have at least one functional layer which is arranged between the outer layer and the sealing layer, wherein the functional layer comprises metallized BOPP and wherein the metallized BOPP is stretched by a factor of more than 1.1 and less than 2, in particular more than 1.2 and less than 1.8. By providing such a functional layer, sufficient tightness and opacity can be achieved with a sufficiently high rigidity of the functional layer and low material usage.

[0138] It can further be provided that the sealing layer is made of cast polypropylene (CPP), and wherein the CPP is stretched by a factor of more than 3 and less than 8, in particular by more than 4 and less than 7. This can advantageously reduce the material used in the sealing layer, while at the same time ensuring that enough CPP is available for reliable sealing.

[0139] The factors described so far for stretching the respective layers refer to a direction along the transport direction or the machine direction. Transverse to this direction, i.e., in a direction transverse to the transport direction, the stretch factor can be less than 1, in particular between 0.2 and 0.8, preferably between 0.3 and 0.8 for the outer layer and / or the functional layer. For the sealing layer, a factor in a direction transverse to the machine direction for compression can be between 2 and 15, preferably between 3 and 12.

Claims

Patent claims 1 . Recyclable stand-up pouch (1 ) for beverages based on polypropylene, 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 2.25, in particular by a factor of more than 2.

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 6.50, preferably by a factor of less than 6.25, in particular by a factor of less than 6.

00.

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 2 to 4 or by a factor of 2.5 to 3.

5.

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) has at least one functional layer (8) which is arranged between the outer layer (5, 10) and the sealing layer (9, 11), wherein the functional layer (8) 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.

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 BOPP 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 outer layer (5) has a print (6) which is preferably applied by reverse printing.

9. Stand Up Pouch according to one of claims 1 to 8, 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.

10. Stand Up Pouch according to one of claims 1 to 9, 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.

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

12. Stand Up Pouch according to one of claims 1 to 11, 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.

13. Stand-up pouch according to one of claims 1 to 12, wherein the thickness of the front side (2) and / or the thickness of the back side (3) is greater than the thickness of the base by a factor of more than 1.05 and less than 1.5 or by a factor of more than 1.05 and less than 1.

3.

14. Stand-up pouch according to one of claims 1 to 12, characterized in that the outer layer (5, 10) is made of BOPP, wherein the BOPP 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, wherein the outer layer is formed from BOPP and wherein the BOPP is thicker by a factor of more than 1.1 and less than 2, in particular more than 1.2 and less than 1.

8.

16. Stand-up pouch according to one of claims 1 to 15, wherein the front side (2) and / or the back side (3) and / or the bottom (4) has at least one functional layer (8) which is arranged between the outer layer (5, 10) and the sealing layer (9, 11), wherein the functional layer comprises metallized BOPP and wherein the metallized BOPP is stretched by a factor of more than 1.1 and less than 2, in particular more than 1.2 and less than 1.

8.

17. Stand-up pouch according to one of claims 1 to 16, wherein the sealing layer is formed from cast polypropylene (CPP) and wherein the CPP is stretched by a factor of more than 3 and less than 8, in particular more than 4 and less than 7.

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

19. Stand-up pouch according to one of claims 1 to 18, 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%.

20. Stand-up pouch according to one of claims 1 to 19, characterized in that the outer layer (5, 10) has a heat-resistant coating.

21. 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).

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

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