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  • Measuring cells for oxygen and water vapour permeation: standard vs. edge effect measuring cell

    Measuring cells for oxygen and water vapour permeation: standard vs. edge effect measuring cell

    Packaging materials often need to act as a barrier against oxygen (O₂) and water vapour (moisture) to keep food fresh and ensure a long shelf life. The permeation rate (OTR for oxygen transmission rate and WVTR for water vapour transmission rate) indicates how much gas diffuses through a material. These rates can be determined precisely using special testing instruments, such as the MOCON (Ametek) permeation testers. The film or packaging to be tested is clamped into a measuring cell that separates two chambers (one side with a high gas concentration, the other one with an inert carrier gas). This allows the amount of O₂ or H₂O that penetrates the material per unit of time to be measured.

    Standard measuring cells vs. edge effect measuring cells

    In practice, different types of measuring cells are used. On the left side of the image, you can see a standard measuring cell, and on the right side, an edge effect measuring cell (here from Mocon Ametek). Both serve the purpose of tightly enclosing the sample, but differ in design and performance:

    • Standard measuring cell: Here, the sample is clamped flat between seals (e. g. an O-ring). This proven design delivers reliable results for homogeneous plastic films.
      Challenge: With certain materials – such as coated papers or fibre-based composites – leaks can occur at the edges of the samples. The reason: gas can penetrate the measuring area from the side through porous structures or uneven edges if the film does not lie completely flat everywhere. This phenomenon, known as the “edge effect”, leads to inhomogeneous sealing surfaces and falsified measurement results, as additional oxygen/water vapour can penetrate around the sides of the sample. Standard measuring cells are therefore less suitable for such materials – the measurement results would indicate an excessively high permeation rate, even though the centre of the film is actually denser than the edge.
    • Edge effect measuring cell: To prevent these edge leaks, MOCON Ametek has developed special edge effect measuring cells. Design features include a raised edge and additional seals that completely and homogeneously seal the sample perimeter. This “dam” construction (dam structure) shields the edges from the ambient air. A TruSeal® purge ring is often used: inert gas is fed between two seals, immediately purging any oxygen or moisture that may have penetrated from the edge area. In this way, the edge effect is effectively eliminated by sealing the sample edges during the test and preventing O₂ or H₂O from penetrating from the outside. The result: uniform sealing surfaces without leak paths and thus significantly more stable, more precise measurement results. Background permeation (zero value) decreases, making even the slightest permeabilities more accurately detectable. In short, such edge effect cells enable accurate and reproducible measurement of oxygen and water vapour permeability even for materials with inherent edge leakage (e. g. coated paper composites).

    Innoform Testservice – Your specialist for permeation measurement

    As an independent testing laboratory, Innoform Testservice offers accredited testing methods for OTR and WVTR – we use the appropriate measuring cells depending on the material and the issue at hand. Our laboratories are equipped with modern MOCON OX-TRAN and AQUATRAN systems, enabling us to use both standard measuring cells for common film tests and edge effect measuring cells for demanding materials. This ensures that you always receive reliable measurement results for the oxygen and water vapour permeability of your packaging. Innoform is your expert partner for all aspects of barrier testing and will be happy to advise you on selecting the appropriate test method.

    Note: All measurements are performed in accordance with international standards (e. g. ASTM D3985 for O₂ and ASTM F1249/ISO 15106 for H₂O) and under controlled conditions to ensure the comparability and quality of the results.

    Conclusion: With our expertise and the right measurement technology – whether standard or edge effect – we help to evaluate the barrier properties of packaging in a well-founded manner.

    Contact: Dr. Daniel Wachtendorf, +49 441 94986-22

    More information and online ordering

    Click here to access our free online permeation calculator. A tool for anyone who wants to calculate the permeation properties of barrier films theoretically first.

    Permeationsrechner
  • Plastics in paper packaging

    Plastics in paper packaging

    Part 1: Overview for food and consumer goods

    Reasons for plastic content in paper packaging

    Paper alone does not offer all the properties required for the protection and shelf life of packaged goods. Without a chemical or plastic-based coating, paper/cardboard cannot fulfil many packaging functions – especially in direct contact with food. For this reason, paper is often provided with a thin layer of plastic that serves as a functional barrier. Typical reasons for the use of plastic components are

    • Moisture and liquid protection: Paper is naturally permeable to water and water vapour. A plastic coating, on the other hand, makes the packaging resistant to water, moisture and liquids so that, for example, no water or water vapour can penetrate. This prevents the paper from softening or becoming soggy – for example with frozen food packaging or cups for hot drinks.
    • Fat and oil barrier: Foods with a high fat content (fast food, baked goods, snacks) require a fat-repellent inner coating. Plastic layers prevent the packaging from becoming greasy. Without this barrier, oils and fats would penetrate the paper and make it soggy or unsightly.
    • Gas and flavour protection: Many foods need to be protected from oxygen, carbon dioxide or other gases to ensure a long shelf life. Paper is permeable to gases, so a plastic with very low permeability is often used. For example, special polymers provide almost impermeable oxygen and flavour protection so that the flavour of coffee is retained in paper-based coffee packaging and no air penetrates from the outside.
    • Hygiene and product safety: A continuous plastic layer on the inside can serve as a safe contact surface with the food. It prevents fibres or particles of the paper from getting into the food and can thus ensure sensory neutrality (no foreign odour or taste). In addition, such layers can act as a functional barrier that reduces the transfer of undesirable substances (e.g. printing inks from the paper) into the food.
    • Sealability (sealing): Many types of packaging – bags, coated paper films, to-go cup lids, etc. – must be thermally sealed to ensure a tight seal. Pure paper cannot simply be welded. The plastic component, on the other hand, is weldable, i.e. it melts when heated and thus enables stable sealing seams. Without the plastic component, coffee cups, for example, could not be sealed tightly with lids and paper bags could not be sealed automatically.
    • Mechanical stability: In some cases, the plastic content also contributes to the tear resistance and stabilisation of the composite material. The plastic layer can reinforce the paper and make it less susceptible to tears, punctures or mechanical stress – important for heavy or pointed packaged goods, for example.

    To summarise, thin plastic layers make it possible to give paper-based packaging similar protective properties to pure plastic packaging without losing the outward appearance of “cardboard/paper”. Moisture, grease, gases and germs are kept out and the packaging remains stable and sealable, which is crucial for ensuring product quality and shelf life. Studies typically put the plastic content of such functionalised paper packaging at up to around 10-20% by weight of the total packaging – a seemingly small proportion, but one that has a major impact on the performance of the packaging.

    If you would like to know how the plastic content is tested and categorised, please subscribe to our newsletter – updates will follow.

    Author: Dr Daniel Wachtendorf, Innoform GmbH August 2025

  • Precise evaluation of weather resistance

    Precise evaluation of weather resistance

    Q-UV artificial weathering of films and papers helps evaluate weather resistance.

    Overall purpose

    Artificial weathering is an indispensable method for evaluating the long-term durability and weather resistance of plastics. With the help of modern testing devices, such as the Q-UV device, damage caused by UV radiation and moisture can be simulated in a targeted manner. Standardised procedures according to DIN EN ISO 4892-3 and DIN EN 14932 allow realistic ageing processes to be efficiently reproduced. This method provides important insights, particularly for applications in the construction, automotive and agricultural industries. The results are a significant aid to product development and quality assurance.

    Test methods to proof the weather resistance

    Artificial weathering of plastics is an essential part of materials testing focused on weather resistance. It is used to assess the long-term durability of materials when exposed to UV radiation, humidity and temperature. While test methods using xenon arc lamps simulate a broad light spectrum, UV fluorescent lamps enable targeted investigations in the short-wave UV range.

    With the addition of a Q-UV device, tests can now be carried out in accordance with DIN EN ISO 4892-3 and DIN EN 14932. These standards define test methods for assessing the artificial weathering of plastics with UV radiation and moisture. This greatly affects weather resistance. The procedure is particularly relevant for applications in which plastics are exposed to intense solar radiation. These applications include the building industry, the automotive industry, and especially in agriculture.

    The Q-UV tester simulates the damaging effect of UV light and moisture by cyclically exposing the samples. UV fluorescent lamps that emit in defined wavelength ranges are used. Radiation in the UV range has a high energy density and is capable of breaking molecular bonds in plastics. This process leads to embrittlement, discolouration or a loss of mechanical properties.

    In addition to UV radiation, the sample is periodically exposed to moisture in the form of condensation or spray. This cyclical combination of radiation and moisture provides a realistic ageing simulation. It is highly relevant to various classes of materials and their weather resistance.

    Advantages and areas of application 

    • More precise ageing simulation: specific damage mechanisms can be examined through targeted UV irradiation, enhancing the assessment of weather resistance. 
    • Standardised test procedures: meets the requirements of DIN EN ISO 4892-3 and DIN EN 14932. 
    • Comparability with natural weathering tests: artificial weathering enables an accelerated evaluation. The results can be correlated with field tests, which often measure weather resistance. 
    • Wide range of applications: the method is suitable for plastics, paints, coatings and other polymeric materials.

    The addition of Q-UV to the test capabilities complements existing artificial weathering methods. It allows detailed assessment of material ageing under specific conditions. This knowledge is vital for both product development and quality assurance across a range of industries.

    Find more tests on these subjects here.

    To relevant tests
  • Regulation (EU) 2024/3190 (BPA)

    Regulation (EU) 2024/3190 (BPA)

    Overview of the regulation

    The EU BPA Food-Contact Ban results in a ban on the use of bisphenol A and bisphenol derivatives

    On 19 December 2024, the European Commission issued a ban on the use of Bisphenol A (BPA) and its salts in materials that come into contact with food. Regulation (EU) 2024/3190 extends the existing restrictions on BPA, which is already banned in the European Union for use in baby bottles. The regulation also contains restrictions for other bisphenols and bisphenol derivatives.

    Repeal of Previous SML & Transitional Periods

    The Specific Migration Limit (SML) for Bisphenol A of 0.05 mg/kg that has applied to date was repealed when the regulation came into force on 20 January 2025. However, a transitional period until 20 July 2026 or 20 January 2028, as the case may be, applies to certain uses.

    Affected Food Contact Materials

    The regulation (EU BPA Food-Contact Ban) applies to food contact materials made of plastics, rubbers and silicones, but also to varnishes and coatings, adhesives, printing inks and ion-exchange resins. The requirements do not currently apply to paper, as BPA is not generally used intentionally in this area.

    Other Regulated Bisphenols & Derivatives

    In addition to bisphenol A, other bisphenols and bisphenol derivatives, are also regulated:

    GENERAL STRUCTURE:

    Bisphenol:

     Ein Bild, das Diagramm, Reihe, Origami, Design enthält. KI-generierte Inhalte können fehlerhaft sein. 
     
    including the salt form     		Bisphenolderivate: 


    Ein Bild, das Diagramm, Reihe, weiß, Design enthält. KI-generierte Inhalte können fehlerhaft sein. 
      
     with the exception of the salt form 
     X: bridge group, for the separation of both phenyl rings by a single atom, which can have any substituent(s). 
    R1 to R10: substituents, of which at least one is not hydrogen 

    Bisphenols and bisphenol derivatives are considered hazardous under the terms of the regulation if they are classified as carcinogenic, mutagenic (cat. 1A and 1B), toxic for reproduction or as an endocrine disrupting for human health (cat. 1) in accordance with the CLP Regulation (EC) 1272/2008.

    The regulation prohibits the use of BPA and its salts, as well as other hazardous bisphenols or hazardous bisphenol derivatives, in the manufacture of food contact materials and the placing on the market of products made with these materials. If other bisphenols or bisphenol derivatives are used, they must not contain BPA residues above a detection limit of 1 µg/kg.

    The following measures are recommended:

    Food contact materials made of: plastic, rubber, silicone, varnishes and coatings, adhesives, printing inks, ion-exchange resins Manufactured with 
    bisphenol A     		Manufactured with other hazardous bisphenols/ bisphenol derivatives Manufactured with other bisphenols/ bisphenol derivatives Manufactured without 
    bisphenols/ bisphenol derivatives 
    (or currently unknown) 
    Search for alternatives (until 20 July 2026) (if no exception applies) x x     
    Request Declarations of Compliance  
    (= supporting documentation)  
    from suppliers     		    x x 
    Test residual content of BPA     x   
    Test migration of BPA x 
    (with exception)     		x 
    (with exception)     		    
    Create Declaration of Compliance /  
    add to Declaration of Compliance for plastics     		x x x x  
    (if supporting documents are available) 

    Compliance Declaration: Requirements

    For plastics, a separate Declaration of Compliance in accordance with Regulation (EU) 2024/3190 is not required if the following additions are included in the declaration in according to Regulation (EU) No. 10/2011:

    • Current telephone number or email address
    • Confirmation that the food contact material complies with Regulation (EU) 2024/3190 : EU BPA Food-Contact Ban
    • Confirmation that no bisphenols or bisphenol derivatives as defined in Regulation (EU) 2024/3190 were used in the manufacture of the products or a list of all bisphenols or bisphenol derivatives used in the manufacture of the food contact material or article

    If necessary, it can be added that the confirmation is based on information from the raw material suppliers.

    For more information, please refer to our flyer, which you can request here: https://innoformtestservicede.sharepoint.com/:b:/s/InnoformGmbH/EdTh6prd_s5MhH-PJSk4lFgB03bCMjPYZ8K2zDJKDzIKQA?e=efl7Gf

    If you have any questions, please contact fcm@innoform.de. We will be happy to provide you with a quote for the inspection of your documents, the measurement of the BPA content or the BPA migration.

    Examinations on this:

    https://www.innoform-testservice.de/konformitaetsarbeit

    https://www.innoform-testservice.de/spezifische-migration

    https://www.innoform-testservice.de/gesamtmigration-sensorik

  • 19th Amendment of the Plastics Regulation (EU) No. 10/2011

    19th Amendment of the Plastics Regulation (EU) No. 10/2011

    New regulations for plastics in food contact by Regulation (EU) 2025/351 have been published.

    Important amendments to the EU regulations on plastic food contact materials are presented here. These include amendments to Regulation (EU) No. 10/2011, amendments to Regulation (EU) 2022/1616 on recycled plastics and amendments to Regulation (EC) No. 2023/2006 on good manufacturing practice.

    Important clarifications concern the definitions and requirements for plastics, the introduction of “UVCB substances”, purity requirements, regulations on reprocessing and recycling, new labelling regulations and extended declarations of conformity. In addition, rules on conformity testing and transition periods are specified.

    1. Amendments to existing regulations:
      • Amendments to Regulation (EU) No. 10/2011 on plastic materials and articles that come into contact with food.
      • Amendments to Regulation (EU) 2022/1616 on recycled plastics and repeal of Regulation (EC) No 282/2008.
      • Amendments to Regulation (EC) No 2023/2006 on good manufacturing practice.
    1. Clarifications and precisions:
      • Definitions and requirements for the composition of plastics have been specified.
      • Introduction of the term “UVCB substances” (substances with unknown or variable composition).
      • Extent and nature of evidence to demonstrate compliance and composition of starting materials at each stage of the manufacturing process
    1. Purity requirements:
      • Specification of high purity levels for substances used in the manufacture of food contact materials.
      • Specific regulations for the purity of substances of natural origin.
    2. Reprocessing and recycling:
      • Regulations for the reprocessing of plastic by-products.
      • Requirements for quality assurance systems in recycling plants.
    3. Labelling and declaration of conformity:
      • New labelling regulations for reusable food contact materials.
      • Extended requirements for the declaration of compliance, including information on not intentionally added substances (NIAS)
    4. Examinations
      • Rules on conformity testing and assessment of compliance with limit values clarified
      • Criteria for assessing the stability of reusable materials and objects
    5. Transition periods:
      • 18 months first placing on the market
      • 9 months before the end of the transition period, information of the customer if the requirements have not yet been met.

    You can find the regulation here: Regulation – EU – 2025/351 – EN – EUR-Lex

    Contact: Heike Schwertke

  • Innoform Online Consulting is out!

    Innoform Online Consulting is out!

    Discover our new online consulting service from Innoform Test Service!

    We are delighted to present our new online consulting service at Innoform Testservice! With this innovative service, we offer you the opportunity to access our expertise conveniently and flexibly from anywhere.

    What is the Innoform Testservice?

    Innoform Testservice is a recognised testing service provider for flexible packaging made of paper and plastic, with a special focus on the food industry, packaging manufacturers and their suppliers as well as the trade. Our modern equipment and our comprehensive knowledge of food regulations and flexpack requirements enable us to provide you with precise answers to your questions, such as

    • Food contact (conformity testing, migration tests, etc.)
    • Material characterisation (type, properties, permeation, etc.)
    • Recyclates (quality, suitability, contamination)

    Our test results and assessments are recognised by manufacturers and users of paper and plastic packaging alike and help to assess and avoid risks.

    Our new online consulting service

    With our new online consulting service, you can now get in touch with our experts directly and discuss your questions and concerns about packaging testing and optimisation. Whether you need support in selecting the right packaging material or you have specific questions about our test methods – we are here for you!

    And all without any risk. Because if you come to the conclusion that we were unable to help you sufficiently in the team meeting, there are no costs involved.

    How can you book a consulting appointment?

    Booking a consulting appointment is easy! Use our online booking service and book the next available slot directly with our experts. Our online tool shows you all available dates and automatically creates an invitation for MS teams. You do not need to be familiar with MS Teams, all you need is a browser, a microphone and speakers, which should be available everywhere these days. So here we go.

    Make an appointment

    We look forward to being able to assist you even better, faster and more competently with our new online consulting service and to answering your testing and packaging questions. Do not hesitate to contact us and benefit from our expertise!

  • The gelbo flex test according to ASTM F 392

    The gelbo flex test according to ASTM F 392

    Innoform Testservice frequently receives requests to test the mechanical strength of flexible (barrier) materials. These materials play a crucial role in many applications, from food packaging to technical protective films. A proven method for testing the mechanical strength of these materials is the gelbo flex test in accordance with ASTM F 392, which focuses in particular on the crease and buckling resistance of barrier materials such as film or paper laminates.

    What is the gelbo flex test?

    The gelbo flex test simulates the stresses to which flexible films are exposed during use. A film sample is stretched onto two rings in the shape of a tube and exposed to repeated pressure and squeezing movements. The intensity and frequency of these movements can be varied to simulate different application scenarios. When performing the test, a distinction is made between two main types, complete and partial twisting. These different methods make it possible to accurately simulate the specific requirements of different applications.

    After loading: testing the samples

    After the mechanical stress caused by the yellow flex test, the film samples can be further analysed in two ways:

    Optical examination for pinholes: In this case, the sample is checked for small holes or weak points that may have been caused by the mechanical stress. This can be done either with the aid of a light table or a special test liquid. These pinholes may significantly affect the barrier properties. 2. permeation test: Using this method, the barrier effect of the stressed sample is compared with that of an untreated sample. This shows the extent to which the mechanical load influences the film’s ability to retain gases or water vapour.

    Why is the gelbo flex test important?

    In practice, high demands are placed on flexible materials. The yellow flex test offers a standardised method for evaluating the mechanical strength of these materials under realistic conditions. This enables manufacturers and users to ensure the quality and reliability of their products.

    Conclusion

    Innoform Testservice is your competent partner for testing the mechanical strength of flexible materials. With the gelbo flex test in accordance with ASTM F 392, we offer you a reliable method for testing and optimising the strength and barrier properties of your materials. Trust in our expertise and experience to ensure the quality of your products. www.innoform-testservice.de

    Video Innoform Testservice
  • Initially unpopular EU directives promote innovation.

    Initially unpopular EU directives promote innovation.

    Hallo, I am the new Easy Opening cap – your hero on the beverage carton!

    The EU did not think of that when they told me to live on the packaging.

    Stay by my side, I will show you the world of beverages anew!

    Hey, it is me, the brand new cap that never comes off your beverage packaging. Why am I so cool? Because I stick around, no matter what. I am like the loyal friend you never lose – always by your side!

    Opening made easy – even for morning grouches!

    I know it is hard to open your eyes in the morning. But do not worry, you do not have to struggle with me. One little movement and the milk is there! No spilling, no swearing. And when you have had enough, you simply close me again. Life can be that simple!

    As secure as Fort Knox!

    I have another cool feature: the tamper-evident closure. It is like promising you that nobody else can get to your drink but you. When you open it, you know you are the first. That is a good feeling, isn’t it?

    Environmentally friendly – because I do not run away!

    I stick to the packaging and do not disappear into the rubbish as a single item. Less plastic for the environment, more green conscience for you! And because you can close me again and again, you help to avoid food waste. That makes us a great team for the planet!

    EU-compliant – I stick to the rules!

    And in case you did not know: I fully comply with EU Directive 2019/904, which states that me and my mates, the other plugs, are not allowed to run away from the packaging. We stay where we are to produce less waste. Isn’t that great?

    Try me out – and do good!

    So, let us do it together – open, close, drink and repeat it! I promise you, disposal will never be a chore with me. Together we will make your beverages safe, convenient and environmentally friendly. And it is also fun! Give me a try and you will see how easy and clean your life can be!

    PS: And a big thank you to all those who not only further develop resealable closures for disposable packaging in line with EU requirements and in a cost-optimised manner, but also produce genuine innovations, as this video shows.

    Karsten Schröder

    (with the support of ChatGPT)

    Video: Innoform – delivers flexpack knowledge , Jan Schröder (js@innoform.eu)

    This is my personal assessment. I was not paid or asked to do this by anyone.

  • Choosing the right packaging material for a greener future  

    Choosing the right packaging material for a greener future  

    Example: paper or plastic film   

    The question of sustainability between film and paper packaging can be quite complex, as it depends on a number of factors, including manufacturing processes, the life of the material and recycling options.  

    1. Production effort  

    Paper packaging: the production of paper is energy intensive and requires the use of large quantities of water.  

    Plastic film packaging: plastic film production requires less energy and less water than paper production.   

    1. Recyclability  

    Paper packaging: paper packaging is generally easier to recycle and compost, which gives it an advantage in terms of environmental sustainability.  

    Film packaging: plastic packaging is currently more difficult to recycle. However, there is progress in the development of recyclable and biodegradable plastic films. With paper, on the other hand, seems to be slower as far as recyclability is concerned. However, progress in the removal of printing inks and adhesives can already be seen and smaller innovations are also still to be expected.   

    1. Protective function  

    Paper packaging: paper does not always offer the best protection from moisture and gases, which can affect the shelf life of the product. Nor does it have the sealing ability to close a package tightly. However, paper can score points when opening a sealed or glued package.  

    Film packaging: film packaging can provide a better barrier function, keeping the product fresh for longer and wasting less food, which can also have a positive impact on sustainability. Easy opening and resealing are also common features of film packaging today.  

    To be able to make an informed decision, consider a life cycle assessment (LCA) that evaluates all environmental aspects from manufacturing to disposal. Typical parameters often used for simplification are the carbon footprint and the water footprint. These two values are intended to establish a comprehensible comparability. The smaller both footprints are, the more environmentally friendly the product is.  

    However, sustainability consists of the three pillars of economy, ecology and social issues. All three pillars must be considered in a balanced way.   

    An optimum must be sought between these partly competing aspects. In such complex decisions today, usually only the economic factor and the two footprints mentioned before are evaluated. However, work is being done on models that enable sustainability controlling – similar to financial controlling – at the push of a button.  

    This is often still neglected in today’s discussion. Here, too, we initially focused only on environmental impacts and resource consumption.  

    With this article, I would like to contribute again step by step to the objective discussion about the selection of packaging materials – to be continued. 

  • Barrier films become more recyclable

    Barrier films become more recyclable

    One thing is clear in Würzburg on 22 and 23 June 2023 – The mega trend in the packaging sector – recyclability – is also and especially affecting barrier films.

    Based on presentations on food waste and the guiding principle of sustainability itself, it quickly becomes clear – barrier films will continue to drive the flexpack market. The 3 pillars of sustainability: economy, ecology and social issues must be taken into account in a more balanced way, says Hilmar Heithorst. We are currently focusing on recycling and thus on ecology, but if this is not also implemented socially and economically, it is not sustainable.

    The primary task of packaging as a whole is to avoid food waste, emphasises Thomas Gröner. It is a shame that about one third of the food produced is not eaten. Some of it still spoils on its way from the field to the plate because barriers are missing and supply chains are too long. Here, too, Flexpack can help to avoid CO2 emissions.

    Peter Olbrich has solutions for this with his vacuum coating systems and a lot of know-how to produce wafer-thin barrier layers of aluminium, aluminium oxide (transparent) and silicon oxide. Here there are market-driven systems for the production of extremely inexpensive and meanwhile also robust barriers against oxygen and water vapour. And the best thing is that these layers, which are only a few nanometres thin, do not interfere with any of the previous recycling processes, so that the polymeric carrier layers can be recycled and reused. Only metallisation leads to a slight greying of the rain protection films – “grey is the new green”.

    Stefan Schiessl presents the Fraunhofer development results around nanocomposites, which can be used as barriers on paper, among other things. The systems, which can be applied with common painting and coating processes, are also recyclable and some of them are already commercially available.

    Ben Raven is aiming in the same direction with its polyethylenes for mono- and even biaxially oriented PE films. Mono-material instead of multi-material for even better recycling of film packaging. New here are PE types with higher density for the recycling process, which can be recycled mechanically and chemically without problems.

    Jiabril Gigli relies on aqueous barrier coatings and presents his high-performance systems that result in good to very good barrier values on both paper and film.

    Thomas Schmitt reports on monoaxial stretching systems for blown film that stretch at the top of the bubble before the tube is laid flat. This saves energy because the bubble is still warm and increases the degrees of freedom in the process. One advantage is the improved flatness of such films.

    Anna Helgert reports on thermoformed packaging that can also be material-reduced in construction. For example, meat can hardly be packaged more minimally in shrink packaging – but of course this is also possible with the thinnest films using barrier coextrudates.

    Achim Grefenstein shares his new developments from the modular system, which are all based on monoaxially stretched blown films, with market competitors. We need to quickly achieve significant volume shifts from multi-material to mono-material. For Flexpack, he sees only 3 polymers in the medium term: polyethylene (PE), polypropylene (PP) and polyethylene terephthalate (PET). These films are all based on either PE or PP and can also be combined. The multi-layer, stretched blown film can be supplied – depending on the application – with or without a barrier.

    Christian Lutze enlightens the plastics experts about the advantages and disadvantages of paper packaging. Mitsubishi supplies only virgin fibres for the food packaging market and relies on recyclable, water-based systems for barriers, which should not exceed the 5 % foreign matter limit for paper packaging. Oxygen, aroma, fat and water vapour barriers already exist in the medium barrier range. But even in the paper sector, recyclates are only hesitantly used for food packaging – for good reason!

    Jochen Moesslein offers a fluorescent tracer not only to mark individual materials or layers, but to make entire recipes identifiable in the recycling stream. A tracer can therefore be provided with an entire recipe – ideally printed on packaging or as a label. The first industrial prototypes have already been developed with Zeiss, and from September recyclers will be able to carry out tests at Polysecure’s technical centre.

    Andreas Peterhanwahr offers monitoring and quality assurance systems for regenerated films from a single source. Integration into the machine software and retrofitting are also possible.

    Victor Trapp relies on bio-ormocers. This is where the circle closes, he says, referring to the impressive barrier properties of ormoceres – also based on biopolymers. Intensive work is also being done on the price. The fact that ormocers are used, among other things, to refine high and ultra-high barriers proves their raison d’être.

    Lars Hancke finally describes the enormous variety of coatings with different barriers against UV light, grease, oxygen and water vapour that a coating and ink manufacturer can offer today. Deinking will also play a role here to make printed films and papers even more recyclable in the future. All together, less material, mono-material build-ups, deinking and a barrier adapted to the application will, in his opinion and the opinion of all participants and speakers, enable the way to a circular economy with barrier films.

    We cannot do without them – that is the consensus.

    More information and purchase of access data to the recordings and presentations at: innoform-coaching.de/tagung/barriere-verbundfolien-der-expertentreff-2022.

    We streamed the summary live on LinkedIn and it is available in German here: https://www.linkedin.com/posts/karstenschroeder_flexpackbranche-skz-innoform-activity-7077962399147786240-UTfI?utm_source=share&utm_medium=member_desktop

    Karsten Schröder, June 2023

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