group.sr.Zum Inhalt group.sr.Zum Inhaltsverzeichnis group.sr.Zur Hautpnavigation
Brückner Group SE
Menü
Home
  • Technologien
  • Nachhaltigkeit
    Zurück Nachhaltigkeit
    • Ökologie
    • Ökonomie
    • Soziales
    • Initiative "Yes, we care"
  • Über uns
    Zurück Über uns
    • Geschäftsführung
    • Mitarbeiter
    • Geschichte & Höhepunkte
  • Auf einen Blick
  • Management Holding
  • Technologieführerschaft
  • Partnerschaften
  • Digitalisierung
  • Compliance
  • News-Room
  • Downloads
  • Karriere
  • Brückner-Gruppe weltweit
Brückner Group SE
Königsberger Str. 5-7
83313 Siegsdorf
Deutschland
+49 8662 63-0
brueckner.group@brueckner.com
  • Mitglieder der Brückner-Gruppe
    Schließen
    Brückner Maschinenbau GmbH
    STRETCHING
    THE
    LIMITS
    Weitere Informationen
    Brückner Servtec GmbH
    SERVING
    YOUR
    SUCCESS
    Weitere Informationen
    KIEFEL GmbH
    DRIVING
    YOUR
    PERFORMANCE
    Weitere Informationen
    PackSys Global AG
    CREATING
    PACKAGING TECHNOLOGY
    Weitere Informationen
  • Karriere
  • DE
    English 中文
  • Schließen

    Suche

    Wonach suchen Sie?

Table Of Content
    1. Brückner Group
    2. News-Room
    3. Production of Sealable and Peelable BOPET Lidding films for Mono-Material PET Packaging
    Bitte beachten: Diese Seite ist nur auf Englisch verfügbar.
    Folge uns:

    Production of Sealable and Peelable BOPET Lidding films for Mono-Material PET Packaging

    21 Jan 2025

    Polyester (PET) bottle stream recycling is already well developed. Bottle collection, sorting, washing and mechanical recycling delivering rPET is suitable for food grade PET Trays and Biaxially oriented Polyethylene Terephthalate (BOPET) film. The chemical nature of Polyester as a “living” polymer even allows upcycling via SSP/LSP (solid/liquid state polycondensation) and chemical recycling back to the polyester building blocks.

    Trays & lids with high PCR content (up to 50%) PET are already established. rPET from bottle stream is available for direct food contact. rPET from other streams e.g. food grade PET tray has to be made available to satisfy the demand for high quality rPET. Following requirements must be fulfilled:

    • Hermetically closed packaging
    • Convenient, easy opening function
    • Plain PET thermoformed tray (mono-material)
    • Mono-material BOPET lidding film, sealing on plain PET tray
    • Seal strength > 2 N/15mm
    • Cost efficient processing

    BOPET is used for a wide range of film applications. The most common use is for packaging lidding film for which it is usually produced within a thickness range between 8 and 50 µm.

    Traditional flexible packaging film usually consists of at least two layers: a structural polymer, which is used to make the body of the packaging and a polymer layer for hermetic sealing or blends for peel sealing. BOPET, with its melting point over 260 °C, is the ideal structural polymer, while a PE blown film with a melting point below 120 °C is traditionally preferred for the sealing layer. In food applications that require an enhanced barrier against oxygen or water vapor, a third layer is often added.

    For mono-material PET packaging the PE sealing material is substituted by special co-polyesters supplied by Bostik under VITEL Tradename. Thick sealing layer required to achieve hermetically sealed stand up pouches and flow packs is not required for tray & lid packaging formats. Indeed, a thin layer of less than 3 microns is enough to ensure hermeticity and food safety. As a result, tray & lid packaging design is very well suited for sealable BOPET.

    Production of sealable BOPET

    Together with Bostik, it was possible to produce sealable BOPET layer – in the same way as it has been common practice with BOPP for many years – by co-extrusion followed by stretching. The following challenges had to be solved:

    • A unique co-polyester offering the following benefits was selected to produce the peelable lidding film: low sealing initiation temperature, adequate rheology to favor good co-extrudability and allowing smooth easy opening without shedding
    • The BOPET production process was adjusted to the new sealing material
    • The BOPET line was customized to the changed process.

    The VITEL co-polyester supplied by Bostik is selected to the requirements of the end-use application for both A-PET (amorphous) and C-PET (crystalline) trays over a very wide range (from peel to lock seal). For 2,5 µm sealing layer thickness the peel force can vary from 3 N/15 mm for 110 °C and 6 N/15 mm for 170 °C. For higher sealing layer thicknesses > 5 µm lock seal is achieved.

    Experiences from trials on Brückner’s pilot line

    For stretching co-extruded sealable BOPET film the following adjustments are necessary to a standard BOPET plant:

    • Equipment with a three-layer die for CAB structure
    • Special coating of the preheating and stretching rolls
    • Individually heated preheating and stretching rolls

    Due to the very different melt temperatures, the extrusion conditions must be designed and adjusted accordingly. With these different materials, particular attention must be paid to the choice of extruder and the melt flow to the die.The sealing co-polyester physical features made it necessary to adjust the process temperatures and the MDO settings in such a way that the surface temperature of the rolls never exceed the temperature limit at which the sealing materials becomes sticky. 

    Conclusion

    Applying unique Bostik’s VITEL co-polyesters, sealable and peelable mono-material BOPET lidding films can be produced in one pass via simple co-extrusion with a BOPET line equipped with a 3-layer die (CAB). The resulting films exhibit a wide application scope using Multivac thermoforming machines and Sealpac tray sealers giving peelable closures to APET or CPET thermoforms without using a dissimilar sealing polymer such as PE.

    A standard BOPET line must be equipped with a 3-layer die, special MDO pre-heating and stretching rollers plus an intelligent heat management for the preheating and stretching rollers in order to protect the sealable film surface from sticking.

    About Bostik

    Bostik, the adhesive division of Arkema, is a leading global player in specialty adhesives for industrial, construction, and consumer markets. For over 130 years, Bostik has been innovating by developing multifunctional bonding and sealing solutions, enabling its customers to tackle today’s and tomorrow’s ecological, energy, and technological challenges. With a presence in more than 45 countries and 7,000 employees, Bostik generated €2.7 billion in revenue in 2023. Through continuous improvement and recognized technological expertise, Bostik offers sustainable solutions tailored to meet the performance and responsibility needs of its customers. www.bostik.com

    Weitere Nachrichten

    Das könnte Sie auch interessieren

    06 Jun 2025

    Yangzhou Boheng and Brückner successfully start a new line | 扬州博恒与布鲁克纳成功投产新生产线

    An important impetus for China’s entire current collector film industry | 中国集流体薄膜产业的重要推动力
    Mehr lesen
    28 Mai 2025

    First hybrid BOPP/PE line successfully commissioned in the Southeast Asian markets

    PT. Indopoly Swakarsa and Brückner are celebrating the unlocked potential for BOPE packaging solutions in this region
    Mehr lesen
    13 Mai 2025

    Hubei Firsta and Brückner Servtec cooperate for major inline coating upgrade

    Agreement officially signed at Chinaplas 2025
    Mehr lesen
    06 Mai 2025

    Manucor transitions to state-of-the-art twin screw extrusion

    Significantly lower energy consumption and maximized film quality as key benefits 
    Mehr lesen
    10 Apr 2025

    A clear commitment to film production in Europe

    Plastchim-T/Manucor orders a new Brückner BOPP film line
    Mehr lesen
    10 Apr 2025

    Inteplast Group relies on NDC thickness gauge technology

    Brückner Servtec supplies advanced thickness measurement solutions 
    Mehr lesen
    24 Mär 2025

    Two new high-efficiency BOPP lines for GulfPack

    Setting the benchmark in the GCC area and beyond
    Mehr lesen
    19 Mär 2025

    Value added labels and packaging films? Brückner’s LISIM® is the technology of choice

    Unique simultaneous stretching line for Innovia
    Mehr lesen
    18 Mär 2025

    Kiefel-Mitarbeiter Sven Engelmann mit dem renommierten President’s Cup der SPE ausgezeichnet

    Auszeichnung für über 20 Jahre Engagement, inklusive Führungsrollen und Förderung transatlantischer Kooperation in der Thermoforming-Branche. Verleihung auf der SPE ANTEC® 2025 in Philadelphia
    Mehr lesen
    11 Mär 2025

    Changzhou Zhongheng successfully upgrades to TDO e-heating register

    Reduced CO2 emissions and less maintenance as key benefits
    Mehr lesen
    Mehr über die Mitglieder der Brückner-Gruppe
    Members of Brückner Group
    • Brückner Maschinenbau
    • Brückner Servtec
    • Kiefel
    • PackSys Global
    Weltweit
    • Brückner-Gruppe auf einen Blick
    • Brückner-Gruppe weltweit
    • Karriere
    Quick Links
    • Über uns
    • Management-Holding
    • Technologien
    • Compliance
    • Karriere Holding
    Find us here
    Brückner Group SE
    • Impressum
    • Datenschutzhinweis
    • DSGVO-Informationen
    • Haftungsausschluss
    © Copyright 2025 Brückner Group SE