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WO2025238120A1 - Stratifié à couche barrière stérilisable, procédé de fabrication correspondant et son utilisation - Google Patents

Stratifié à couche barrière stérilisable, procédé de fabrication correspondant et son utilisation

Info

Publication number
WO2025238120A1
WO2025238120A1 PCT/EP2025/063307 EP2025063307W WO2025238120A1 WO 2025238120 A1 WO2025238120 A1 WO 2025238120A1 EP 2025063307 W EP2025063307 W EP 2025063307W WO 2025238120 A1 WO2025238120 A1 WO 2025238120A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
polypropylene
laminate
range
barrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2025/063307
Other languages
German (de)
English (en)
Inventor
Karoline Knackert
Johannes OBERMAYER
Michael Dorn
Markus Schäftner
Stefan Kreutzer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huhtamaki Flexible Packaging Germany GmbH and Co KG
Original Assignee
Huhtamaki Flexible Packaging Germany GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102024113942.0A external-priority patent/DE102024113942A1/de
Application filed by Huhtamaki Flexible Packaging Germany GmbH and Co KG filed Critical Huhtamaki Flexible Packaging Germany GmbH and Co KG
Publication of WO2025238120A1 publication Critical patent/WO2025238120A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/516—Oriented mono-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/737—Dimensions, e.g. volume or area
    • B32B2307/7375—Linear, e.g. length, distance or width
    • B32B2307/7376—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/75—Printability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging

Definitions

  • the invention relates to a sterilizable barrier layer laminate according to the preamble of claim 1, a method for producing such a laminate according to the preamble of claim 14 and its use according to the preamble of claim 15.
  • Sterilizable barrier layer laminates have been known for some time and are used, for example, for packaging food, animal feed or medicines, especially when perishable goods need to be packaged in a watertight and airtight manner.
  • the object of the invention is to avoid the aforementioned disadvantages and to provide a sterilizable barrier layer laminate that is cost-effective to produce with reduced material requirements, is easily recyclable, and is suitable for the production of packaging for, among other things, food, animal feed, and pharmaceuticals. It is also aesthetically pleasing, sealable, and, in particular, heat-sterilizable. Furthermore, the object of the invention includes a method for producing such a barrier layer laminate and its use for... Production of packaging for, among other things, food, animal feed and medicines.
  • a sterilizable barrier layer laminate with a polypropylene outer layer having barrier properties and reverse printing, as well as with a primer layer applied to the printing and with a polypropylene inner layer, wherein a polypropylene compound layer is extruded between the primer layer and the polypropylene inner layer, and wherein the polypropylene inner layer, in particular according to a preferred embodiment of the invention, has a stretch in the machine direction and exhibits a maximum shrinkage of -2.5%, preferably -2% and particularly preferably -1.8% in the machine direction and a maximum shrinkage of -1%, preferably -0.8% and particularly preferably -0.5% in the transverse direction at a temperature of 130°C over a period of 30 minutes.
  • a significant advantage of such a sterilizable barrier layer laminate according to the invention is that this new barrier layer laminate structure requires only two polypropylene layers instead of the previous three: namely, an outer polypropylene layer exhibiting barrier properties, which advantageously also serves as a printable layer, and an inner polypropylene layer, which, when the new barrier layer laminate according to the invention is used to manufacture packaging, faces the product to be packaged and serves as a sealing layer.
  • these two polypropylene layers are joined by means of a very thin polypropylene compound layer extruded between them, which is chemically identical to the two outer polypropylene layers in its polymer composition. Due to the chemically identical material, this thin, extruded polypropylene compound layer bonds strongly to the inner polypropylene layer.
  • a further aspect of the invention is that the polypropylene inner layer has a stretch in the machine direction and is simultaneously temperature-stable, sealable, and sterilizable, wherein the term "temperature-stable” in this case means that the polypropylene inner layer can be heated to a temperature of 130°C for a period of 30 minutes, for example by autoclaving, without being subject to shrinkage exceeding a degree of shrinkage of -2.5%, preferably -2%, and particularly preferably -1.8% in the machine direction and a maximum shrinkage of -1%, preferably -0.8%, and particularly preferably -0.5% in the transverse direction.
  • the term "temperature-stable” in this case means that the polypropylene inner layer can be heated to a temperature of 130°C for a period of 30 minutes, for example by autoclaving, without being subject to shrinkage exceeding a degree of shrinkage of -2.5%, preferably -2%, and particularly preferably -1.8% in the machine direction and a maximum shrinkage of -1%,
  • This highly advantageous property of the polypropylene inner layer of the sterilizable barrier layer laminate according to the invention is achieved by using a polypropylene film that, during its production, is stretched and tempered and subsequently relaxed, wherein the stretching and tempering are carried out at a temperature in the range of 130°C to 145°C and the subsequent relaxation is achieved by reducing the speed of the last of the rollers used for stretching to a factor in the range of 0.9–0.99, preferably in the range of 0.95–0.975.
  • a stretched polypropylene film could be produced according to the invention which, during a sealing process and/or sterilization, even in humid environments and at a temperature of 130°C for a period of up to half an hour, exhibits practically no significant shrinkage or elongation.
  • a further significant advantage of such a polypropylene inner layer according to the invention is that the sterilizable barrier layer laminate according to the invention achieves a significantly improved stiffness compared to previous sterilizable barrier layer laminates, which on the one hand particularly improves the machine processability of the sterilizable barrier layer laminate according to the invention, and on the other hand the The feel and stability of packaging made from this barrier layer laminate are significantly improved.
  • the sterilizable barrier layer laminate according to the invention thus exhibits significantly higher stiffness, very good, especially straight, tearability, and very reduced, almost non-existent, shrinkage compared to previously known sterilizable barrier layer laminates.
  • the sterilizable barrier layer laminate according to the invention can be easily sealed and sterilized even at high temperatures, such as those found in an autoclave, i.e., in a hot steam atmosphere at 120 °C to 130 °C under pressure, without the risk of shrinkage and/or stretching and/or becoming brittle and/or the associated risk of loss of the barrier layer.
  • one or even several adhesive layers as were necessary in previous barrier layer laminates, can therefore be dispensed with.
  • an additional central polypropylene layer arranged within the laminate structure which provides the barrier property there according to the prior art, can be dispensed with.
  • the laminate requires considerably less material, namely only two polypropylene layers: an inner polypropylene layer and an outer polypropylene layer exhibiting barrier properties.
  • the structure of the barrier layer laminate according to the invention requires no adhesive whatsoever, and in particular, no polyurethane-based adhesive. According to the invention, a migration risk of such an adhesive is excluded.
  • the barrier layer laminate according to the invention particularly due to the lack of an adhesive, is practically pure in type, with the exception of an extremely thin printing and primer layer, so that the recyclability of the sterilizable barrier layer laminate according to the invention is significantly improved compared to previously known sterilizable barrier layer laminates.
  • the polypropylene outer layer having barrier properties has a SiO x and/or AIO x layer facing the reverse printing.
  • the barrier properties of the polypropylene outer layer are improved by applying a layer of silicon dioxide and/or aluminum oxide directly onto the polypropylene outer layer.
  • the reverse printing of the polypropylene outer layer is therefore not applied directly to the polypropylene outer layer, but rather to the layer of silicon dioxide and/or aluminum oxide.
  • the primer is then applied to this printed layer, for example by extrusion.
  • the polypropylene outer layer having barrier properties has an orientation, preferably in the machine direction and/or in the transverse direction, by which the barrier layer effect of the polypropylene outer layer is further improved or increased.
  • the polypropylene outer layer having barrier properties has a layer thickness in the range of 10 pm to 40 pm, preferably in the range of 15 pm to 30 pm and particularly preferably in the range of 18 pm to 25 pm.
  • the primer layer has a layer thickness in the range of 0.1 pm to 3 pm, preferably in the range of 0.5 pm to 2 pm and particularly preferably in the range of 1 pm to 1.5 pm.
  • the primer layer is applied to the printed surface by means of a printing process or by extrusion.
  • a printing process or by extrusion Such an application is particularly advantageous because the primer layer can be made extremely thin in this way, namely with the aforementioned A layer thickness of up to a minimum of 0.1 ⁇ m can be applied to the polypropylene outer layer exhibiting barrier properties, or to the reverse printing.
  • Such a thin primer layer thickness namely in the aforementioned range of 0.1 ⁇ m to 3 ⁇ m, preferably in the range of 0.5 ⁇ m to 2 ⁇ m, and particularly preferably in the range of 1 ⁇ m to 1.5 ⁇ m, contributes significantly to the excellent recyclability of the sterilizable barrier layer laminate according to the invention, since this allows the proportion of foreign matter in the otherwise chemically almost pure polypropylene material to be extremely minimized.
  • the polypropylene inner layer has a layer thickness in the range of 35 pm to 100 pm, preferably in the range of 50 pm to 90 pm and particularly preferably in the range of 60 pm to 80 pm.
  • the polypropylene inner layer thus constitutes the key stabilizing layer of the barrier layer laminate according to the invention and also a contact layer to a filling material that is filled into or packaged in a container made from the sterilizable barrier layer laminate according to the invention.
  • this polypropylene inner layer can also be stretched, preferably in the machine direction, which, in addition to the aforementioned extremely positive properties with regard to stiffness, processability, dimensional stability, and tear resistance, also contributes to increasing the barrier effect of the barrier layer laminate according to the invention.
  • the contact transparency with respect to any filling material can be adjusted, for example, by adding titanium dioxide to the polypropylene inner layer to whiten it.
  • the polypropylene inner layer has at least a two-layer structure, wherein a layer of the two-layer structure facing a sealing side comprises a, in particular soft, randomly heterophasic copolymer, for example of the polymer components polypropylene and polyethylene, with a copolymer matrix and two components of these randomly arranged copolymers, each having two different melt flow indices. Furthermore, a layer of the two-layer structure facing a lamination side, i.e., the polypropylene compound layer (50), comprises a, in particular soft, randomly heterophasic copolymer.
  • a copolymer for example again from the monomer units of polypropylene and polypropylene, with a copolymer matrix, which further comprises a heterophasic copolymer with a homo-polypropylene matrix or a copolymer matrix, and, in the case that the laminate according to the invention is to be opaque, a white masterbatch or alternatively, namely in the case that the laminate according to the invention is to be transparent, no white masterbatch, wherein the layer facing the sealing side preferably corresponds to substantially one quarter to one third of the layer thickness of the layer facing the laminating side of the two-layer structure, and both layers are preferably joined together by means of coextrusion.
  • the layer facing the sealing side is a low-temperature sealing layer made of polypropylene, which melts at a temperature in the range of 110°C to 135°C, preferably at a temperature in the range of 120°C to 130°C, wherein the polypropylene, in particular in random arrangement, comprises a polyolefin with a lower melting point than polypropylene, preferably polyethylene, wherein the polyolefin content with the lower melting point, preferably a polyethylene content, is less than 50%, particularly preferably less than 35% and particularly preferably about 30%.
  • the at least two-layer structure can also be three-layered or, preferably, five-layered, or have more than five layers, wherein the outermost layer facing the sealing side essentially corresponds to the specifications given above and represents a low-temperature sealing layer.
  • the respective layers of this respective structure are preferably co-extruded.
  • a significant advantage of the invention arising from this two- or multi-layer structure is that such a stretched and relaxed polypropylene inner layer exhibits an extremely low sealing start temperature, at which very good sealing strength of up to 200 N/15 mm, but in any case greater than or equal to 100 N/15 mm, can already be achieved.
  • Such a very low sealing start temperature which is extremely useful according to the invention, is achieved in particular by the fact that the two- or multi-layer structure used for the polypropylene inner layer is functionally composed of at least two or more parts, namely in the form of one or more relatively thick layers.
  • the side or layer facing the lamination side of the two- or multi-layer structure serves primarily to ensure the structural integrity and stability of the polypropylene inner layer.
  • the heterophasic copolymer with homo matrix can also be replaced by a heterophasic copolymer with copolymer matrix if desired, since the shrinkage of the laminate according to the invention can be improved and its stiffness increased, among other things, in at least the two aforementioned cases, thanks to the special technology of the invention.
  • the polypropylene compound layer is designed as an extruded layer and is therefore very thin, thus saving material.
  • the polypropylene compound layer has a thickness of only 10 pm to 18 pm, preferably 12 pm to 17 pm, and particularly preferably 15 pm to 16 pm.
  • a significant advantage of the barrier layer laminate according to the invention is that this new barrier layer laminate is free of adhesives, and in particular free of polyurethane-based adhesives, thus preventing adhesives from migrating into any contents of packaging made from this new barrier layer laminate and contaminating them. Avoiding such contamination is particularly important with regard to the packaging of food, animal feed, and pharmaceuticals, and represents a significant advantage of the barrier layer laminate according to the invention.
  • a further significant advantage of the sterilizable barrier layer laminate according to the invention is its very good recyclability, which is based on the fact that the laminate according to the invention is almost pure and has a polypropylene content of greater than 91 wt.%, preferably greater than 95 wt.% and particularly preferably greater than 98 wt.%, in particular greater than 99 wt.%.
  • the laminate according to the invention can be sealed without damage and in particular essentially without shrinkage and/or stretching, and/or can also be sterilized with hot steam, especially at a temperature in the range of 120°C to 130°C, which according to the invention is based on the fact that the individual layers of the sterilizable barrier layer laminate according to the invention adhere extremely well and inseparably to one another, which according to the invention is achieved by extruding the polypropylene compound layer in a hot state between the polypropylene inner layer and the polypropylene outer layer having barrier properties, so that an intimate bond is already created between the polypropylene compound layer and the polypropylene inner layer due to the material properties.
  • the primer layer applied to the printing also creates an excellent bond between the polypropylene compound layer and the polypropylene outer layer, so that the barrier layer laminate according to the invention is also resistant to hot steam and high temperatures in the range of 120 °C to 130 °C.
  • the use of the aforementioned oriented and relaxed two-layer polypropylene structure is an important point, since this oriented and relaxed, i.e., after the actual stretching of the two-layer polypropylene structure, is particularly dimensionally stable as a component of the sterilizable barrier layer laminate according to the invention, even at elevated temperatures and, unlike previously known stretched polypropylene films, exhibits practically no significant shrinkage at temperatures up to 130°C ⁇ 10%, even under humid conditions, and is nevertheless ideally suited as a low-temperature sealing layer with very good strength values after sealing.
  • the problem according to the invention is also solved, as mentioned above, by a method for producing a sterilizable barrier layer laminate according to the foregoing descriptions, wherein a polypropylene outer layer in a reverse printing process with a print and the print is subsequently coated with a primer layer, optionally by means of a printing process, to produce a barrier layer structure, wherein the barrier layer structure is connected to a polypropylene inner layer by means of a polypropylene compound layer, wherein the polypropylene compound layer is extruded between the barrier layer structure and the polypropylene inner layer, and wherein the polypropylene inner layer is preferably a polypropylene film with a stretch in the machine direction, which at a temperature of 130°C over a period of 30 minutes has a maximum shrinkage of -2.5%, preferably -2% and particularly preferably -1.8% in the machine direction and a maximum shrinkage of -1%, preferably -0.8% and particularly preferably -0.5% in the transverse direction.
  • the polypropylene outer layer preferably stretched in the machine direction, may have an inner coating of aluminum oxide and/or silicon oxide, pointing towards the polypropylene inner layer, to further improve the barrier effect, particularly against gases, which does not noticeably affect the transparency of the polypropylene outer layer.
  • This layer of aluminum oxide and/or silicon oxide may be present on the polypropylene outer layer as standard or, if desired, applied separately as part of the process according to the invention.
  • the object of the invention is also achieved by using a sterilizable barrier layer laminate according to the above descriptions for the production of packaging, in particular food, animal feed or pharmaceutical packaging, it being particularly emphasized that, especially due to the absence of adhesive in the sterilizable barrier layer laminate according to the invention, excellent cat acceptance can be ensured for packaging produced from this barrier layer laminate, which is a clear indicator that the barrier layer laminate according to the invention is adhesive-free.
  • An important advantage of the invention is that the production of packaging using the sterilizable barrier layer laminate according to the invention is particularly preferred, since the sealing layer is in the form of a low-temperature sealing layer is present which, in the event of sealing and also in the event of any subsequent heat sterilization, essentially does not deform, i.e., in particular, does not warp, shrink, or stretch.
  • a well-known sterilizable barrier laminate on the market is a triplex OPP (oriented polypropylene) barrier/PP (polypropylene structure laminated with adhesive). Adhesives reduce the polypropylene content and thus the recyclability.
  • OPP oriented polypropylene
  • PP polypropylene structure laminated with adhesive
  • both the polypropylene (PP) content and the recyclability can be increased.
  • an OPP barrier film i.e., the polypropylene outer layer
  • an extrusion primer is printed with an extrusion primer.
  • the printed OPP barrier film is then extrusion laminated with a polypropylene sealing layer, i.e., the polypropylene inner layer.
  • the invention is a machine-oriented polypropylene film with reduced shrinkage during sterilization and sealing.
  • the stiffness of previously known mono-polypropylene duplex structures is very low, leading to problems with marking and machine performance.
  • OPP/PP mono-polypropylene duplex structures
  • the stiffness of a sterilizable barrier layer laminate can be improved with an OPP/MOPP structure.
  • this type of sterilizable barrier layer laminate structure was not possible due to the shrinkage of known machine-oriented polypropylene films.
  • standard cast polypropylene or blown polypropylene was preferably used in accordance with the prior art. According to the invention, this existing problem is solved by using specific parameters regarding temperature and speed of the stretching and tempering rollers, respectively, after the film has been drawn for tempering.
  • polypropylene inner layer according to the invention particularly for its sealing side, polypropylene granules with a polyethylene content are used to generate the aforementioned LOW SIT (Sealing Initiation Temperature) property, i.e., the low-sealing polypropylene layer with polyethylene content for the low-temperature sealing layer.
  • This treatment allows the film to harden and relax, thus avoiding the previous shrinkage problem, especially during sealing and sterilization processes, according to the invention.
  • a further advantage of the invention lies in the possibility of printing on an OPP barrier film, i.e., the polypropylene outer layer, and carrying out extrusion lamination of the printed polypropylene outer layer, particularly for sterilization applications. Furthermore, the previously known structure of a sterilizable barrier layer laminate according to the prior art is reduced from three polypropylene layers to two, thus saving material. With the extrusion primer used, sufficient to very good bond strength can be achieved for the sterilizable barrier layer laminate according to the invention.
  • Fig. 1 shows a schematic representation of a sterilizable barrier layer laminate according to the prior art
  • Fig. 2 is a schematic representation of the sterilizable barrier layer laminate according to a preferred embodiment of the invention.
  • Fig. 1 shows a barrier layer laminate 10' according to the prior art.
  • This barrier layer laminate 10' has an outer polypropylene layer 20' which is provided with a reverse print 30.
  • This polypropylene layer 20', including the reverse print 30, is bonded to a central polypropylene layer 70 by means of a first adhesive 80.
  • the central polypropylene layer 70 is in turn bonded to an inner polypropylene layer 60' by means of a further, i.e., second, adhesive layer 80.
  • the central polypropylene layer 70 which provides the barrier layer, also has a coating of aluminum oxide and/or silicon oxide facing towards the first adhesive layer 80.
  • Fig. 2 shows a schematic representation of the sterilizable barrier layer laminate 10 according to a preferred embodiment of the invention, wherein this barrier layer laminate 10 according to the invention comprises only two polypropylene layers: a barrier-property-bearing polypropylene outer layer 20 with a thickness of 20 pm, which in turn has, on its inner side, i.e., facing a print 30, a silicon dioxide and/or aluminum oxide layer, as desired.
  • the sterilizable barrier layer laminate 10 according to the invention has a second polypropylene inner layer 60 with a thickness of either 60 pm or 80 pm.
  • This polypropylene inner layer 60 can, as desired, be colored white, for example with titanium dioxide, with regard to its contact transparency.
  • the polypropylene inner layer 60 consists of a two-layer structure with a layer facing a sealing side, which has a soft, randomly heterophasic comprising a polypropylene-based copolymer forming a copolymer matrix of two random polypropylene-based polymers, wherein the two random polymers, for example polypropylene and polyethylene, have different melt flow indices, and a layer facing a lamination side, i.e. the polypropylene compound layer 50, forming a soft random heterophasic copolymer with a copolymer matrix and further comprising a heterophasic copolymer together with a homo-polypropylene matrix, i.e. a polymer matrix consisting essentially exclusively of polypropylene, and with a white masterbatch.
  • a soft, randomly heterophasic comprising a polypropylene-based copolymer forming a copolymer matrix of two random polypropylene-based polymers, wherein the two random
  • the layer of the two-layer structure facing the sealing side consists of a low-melting polypropylene, i.e., at a temperature in the range of 110°C to 135°C, preferably at a temperature in the range of 120°C to 130°C, which, particularly in random arrangement, comprises a polyolefin with a lower melting point than polypropylene, preferably polyethylene, wherein the polyolefin content with the lower melting point, preferably a polyethylene content, is less than 50%, particularly preferably less than 35% and particularly preferably about 30%.
  • the polypropylene inner layer 60 is designed with its sealing-side layer acting as a low-temperature sealing layer. At a temperature of 130°C over a period of 30 minutes, the polypropylene inner layer 60 exhibits very low shrinkage of -1.8% in the machine direction and very low shrinkage of -0.5% in the transverse direction.
  • the seal strength, or tensile strength, of a seal with the 60 ⁇ m thick polypropylene inner layer 60 is 100 N/15 mm, which is essentially twice the strength of standard polypropylene cast films with a strength of approximately 50 N/15 mm.

Landscapes

  • Laminated Bodies (AREA)

Abstract

L'invention concerne un stratifié à couche barrière (10) stérilisable comprenant une couche extérieure en polypropylène (20) présentant des propriétés barrière, qui comporte une impression inversée (30) ainsi qu'une couche primaire (40) appliquée sur l'impression (30) et une couche intérieure en polypropylène (60), une couche de liaison en polypropylène (50) étant coextrudée entre la couche primaire (40) et la couche intérieure en polypropylène (60). Cette couche intérieure en polypropylène (60) présentant de préférence un étirage dans le sens machine, et un retrait maximal à une température de 130 °C pendant une durée de 30 minutes de -2,5 % dans le sens machine, de préférence -2 % et plus préférablement -1,8 % ; -1 % dans le sens transversal, de préférence -0,8 %, et plus préférablement -0,5 %. Cette invention concerne également un procédé de fabrication d'un tel stratifié à couche barrière (10) stérilisable ainsi que son utilisation pour la fabrication d'un emballage, en particulier d'un emballage alimentaire, pour nourriture pour animaux ou pour médicaments, la couche intérieure en polypropylène (60) du stratifié à couche barrière (10) étant utilisée comme couche de scellage, en particulier comme couche de scellage à basse température.
PCT/EP2025/063307 2024-05-17 2025-05-15 Stratifié à couche barrière stérilisable, procédé de fabrication correspondant et son utilisation Pending WO2025238120A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102024113942.0 2024-05-17
DE102024113942.0A DE102024113942A1 (de) 2024-05-17 2024-05-17 Sterilisierfähiges Barriereschichtlaminat sowie Verfahren zur Herstellung des Laminats und dessen Verwendung
DE102024125618 2024-09-06
DE102024125618.4 2024-09-06

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018215043A1 (de) * 2018-09-04 2020-03-05 Huhtamaki Flexible Packaging Germany Gmbh & Co. Kg Verwendung eines extrusionskaschierten Folienverbunds zur Herstellung eines plastisch dreidimensional umgeformten Folienverbund-Formkörpers, derartiger Formkörper und Verpackung daraus
US20230182457A1 (en) * 2020-06-08 2023-06-15 Amcor Flexibles North America, Inc. Heat resistant recycle-ready retort packaging
DE102022120789A1 (de) * 2022-08-17 2024-02-22 Huhtamaki Flexible Packaging Germany Gmbh & Co. Kg Retortensterilisierbares Lagenmaterial mit Barrierelage aus Metalloxid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018215043A1 (de) * 2018-09-04 2020-03-05 Huhtamaki Flexible Packaging Germany Gmbh & Co. Kg Verwendung eines extrusionskaschierten Folienverbunds zur Herstellung eines plastisch dreidimensional umgeformten Folienverbund-Formkörpers, derartiger Formkörper und Verpackung daraus
US20230182457A1 (en) * 2020-06-08 2023-06-15 Amcor Flexibles North America, Inc. Heat resistant recycle-ready retort packaging
DE102022120789A1 (de) * 2022-08-17 2024-02-22 Huhtamaki Flexible Packaging Germany Gmbh & Co. Kg Retortensterilisierbares Lagenmaterial mit Barrierelage aus Metalloxid

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