Pultruded composite material production

The pultrusion process for manufacturing fibre-reinforced composites is similar to filament winding, as both processes use a DOPAG eldomix to keep an impregnation bath at a constant level. The fibres pass through this impregnating bath. In pultrusion, however, the fibre composite components can be produced as elongated endless profiles, for example in U, T, O or much more complex shapes. These components are mainly used in the automotive or construction industry. They are also installed inside the rotor blades for wind turbines to ensure a higher rigidity of the rotor blade.

In pultrusion, carbon or glass fibres are fed from a roll and passed through an impregnating bath filled with epoxy or polyurethane resin. The fibre composite is subsequently pulled through a heated moulding tool, which has the negative shape of the generated profile. This hardens the fibre composite in an ideal way, resulting in a lightweight but highly resilient composite component with a very high strength.

Alternatively, the current trend is also towards injecting resin into the mould using a higher pressure, similar to the RTM process.

The special features: Pultrusion is one of the few methods by which composite components can be produced as endless profiles. After curing, the pultrusions are continuously pulled and cut to size as required.

Metering systems for pultrusion

  1. compomix


    The compomix DI was developed for dispensing epoxy and PU in infusion processes in the production of rotor blades.

  2. eldomix


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

  3. gluemix


    The gluemix was specially configured for the application of two-component adhesives in rotor blade production.

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