BONDING AND SEALING

Bonding and Sealing

Complex, yet strikingly effective applications

No matter which industry we look at – be it electronics, automotive or aviation – we will notice that bonding has replaced the established joining methods such as welding or screwing. For example, up to 18 kilograms of adhesive are used in the production of a single car. The electronics industry relies on adhesives for potting or sealing of components. In any case, bonding is a complex technique and requires significant specialist knowledge. Material manufacturers are constantly working on new adhesives and increasingly often they are also tailoring them to specific applications. In many cases, bonding is the only viable technique of binding modern materials.

ADHESIVE BONDING WITH EPOXY RESIN, POLYURETHANE AND SILICONE

Adhesive material can be based on epoxy resins, silicones, polyurethanes or methacrylates and it can be a one or a multi-part substance. Multi-component adhesives are metered and mixed by dispensing systems according to a fixed mixing ratio. Polyurethane adhesives often perform a sealing function, are easy to process and have a very good chemical resistance. Most commonly used are epoxy adhesives. They can be processed very well at room temperature and are highly resistant.

METERING METHACRYLATE ADHESIVES

Methacrylate adhesives usually have a very short pot life, which can complicate their processing. On the other hand, they offer the advantage of short curing times and particularly high strength. They are an excellent alternative for the joining of metal, glass and duromeric plastics.

PRE AND POST-TREATMENT OF COMPONENTS

Adhesives do not adhere easily to all components. Depending on the component properties, a pre-treatment such as by corona flame, corona primer or brushing, may be required. The subsequent application of the adhesive can be carried out in various ways, for example in a dot or bead form. After the components are joined, curing systems such as infrared light, ultraviolet light or continuous furnace can be used to accelerate the bonding reaction and speed up the time in which the components are available for the next production step.

In summary, the bonding and sealing process is a relatively complex one with many factors at play. The selected material must be a perfect fit for the application, the application parameters must be clearly and precisely defined and lastly, a metering solution capable of processing the selected material in the defined way needs to be identified. METER MIX® offers robust and proven metering systems which are continuously adapted to the evolving demands of adhesive technology. They present an accessible solution to process-reliable and high-quality processing of adhesive materials.

Systems for Bonding and Sealing Applications

  1. coredis


    DOPAG coredis: a dosing system for honeycomb panels

    Coredis is used for the processing of especially light low density 1K epoxies filled with micro hollow spheres.

  2. Dynamic mixing head

    DOPAG dynamic mixing head

    The dynamic mixing head with its new valve technology has been designed for mixing of low to  high-viscosity polymeric reaction substances for foaming, bonding, sealing, and potting.
  3. economix

    DOPAG economix

    The economix range of systems are compact, solvent free, pneumatically driven piston pump metering and mixing systems.

  4. eldomix

    Dosing system eldomix from DOPAG

    The eldomix 100/600 range of systems are compact, solvent free, gear pump driven metering and mixing systems.

  5. gluemix

    DOPAG gluemix

    The systems of the gluemix product range are compact and solvent free gear pump driven metering and mixing systems.

  6. ladomix

    DOPAG ladomix

    The ladomix G-SF is a compact, mobile gear pump driven metering and mixing system.

  7. modis

    DOPAG modis

    Modis is a highly dynamic, speed-proportional metering system for controlling the flow rate of single component adhesive applications in several industrial sectors.

  8. variomix

    DOPAG variomix dosing system

    The variomix range of systems are solvent free, compact, pneumatic or hydraulically driven piston pump metering and mixing systems.

  9. vectodis

    1K dosing system vectodis

    Vectodis is used to handle single component materials. Just a suitable material supply and metering computer is required.

  10. vectomix

    1K dosing system vectodis

    Vectomix is used to handle multi component materials. Due to its compatibility and modularity, two vectodis single component piston metering with equal or different sizes are used.