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Effectively sealing textile fluid bags


This efficient sealing method for multi-layer, woven, three-dimensional fluid containers enables a wide range of applications in a wide variety of industries.
The sealing process can also be integrated into existing manufacturing processes and is suitable for gases and liquids.


Wher­ever fluids have to be stored or transported in a space-saving manner, these 'fluid bags' are ideal. The range of applications is extremely broad. For example, lightweight solar thermal modules or adaptive facade elements in the building industry could be just as easily realized as alter­natives to the usual foil bags for the medical sector. Here, they could be used as a clothing-integrated element for medication over a longer period of time, which would also have a high degree of tightness and thus safety. Ready-made vests or bandages with integrated 'fluidbags' allow for more mobility for the patient or also a plus in function­ality and mobility for protective or sports clothing.

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Today, flexible containers for liquids or other fluids are made of foil. Fabrics surround these foil containers when they need to be protected from damage, for example. Complex manual production steps and production-related limitations of the container geometry are essential limita­tions of this well-established design.
For one-piece woven fabrics, highly automated manufac­turing processes for 2D and 3D formed air reservoirs are available for the manufacture of airbags in the automotive industry. However, a long-lasting seal for these airbags has been a major challenge in the past for low-cost pro­duction.


Scientists at the Institute for Lightweight Structures and Conceptual Design (ILEK) at the University of Stuttgart have succeeded in developing a method for reliably seal­ing such systems for multi-layer woven containers such as airbags. Textile bags that can be filled with fluids can thus be produced and finished in the required two- and three-dimensional design in a single manufacturing pro­cess.
The previous challenge was to seal the seam between the layers of fabric forming the container. With this invention, it is possible to close the existing micropores and at the same time create a circumferential sealing channel.


  • Flexible, light-weight and 3D shaped containers
  • Excellent seam sealing
  • Sealed containers for fluids such as gases and liquids (of low and high viscosity)
  • Integrated geometry, function and production optimization in the design process
  • Production, sealing and filling in highly automated and coordinated production steps
  • Further processing in existing manufacturing processes of the textile industry
    (sewing, gluing, finishing)

    Scope of application

    The inventive sealing method for containers made of multi-layer, woven fabrics makes it possible to use these 3D shape-optimizable and flexible components in many different fields – from the construction and clothing industry to the medical technology sector.


    TLB GmbH manages inventions until they are marketable and offers companies opportunities for license and col­laboration agreements.

    Development status

    Demonstration model

    Patent situation

    • DE 102014015376 A1 pending
    • EP 3206867 B1 granted
    • AT (EP 3206867 B1) granted
    • BE (EP 3206867 B1) granted
    • CH (EP 3206867 B1) granted
    • DE (EP 3206867 B1) granted
    • FR (EP 3206867 B1) granted
    • GB (EP 3206867 B1) granted


    Seam sealing, woven containers, fluid bag, OPW fabric, filling, textile, chamber structure, sealing method

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