to the actual product – all from a single source.
What is pultrusion ?
The extrusion process is suitable for producing fibre-reinforced plastic profiles at (relatively) low cost. Due to the high curing temperature and constant conditions, the quality of the composite material obtained in this way is well above that achievable with cold-cured hand processes. Higher qualities can be achieved by elaborate prepreg autoclaving processes.
A special problem is the control of the curing reaction of the resin in large profile cross-sections, which can lead to shrinkage cracks – the so-called “centre cracks”
In particular, the speed of production, combined with the high degree of automation and the associated lower costs, open up new fields of application for fibre-reinforced plastic profiles produced using the pultrusion process, for example as a structural replacement for steel profiles in building construction, lightweight construction or in areas with severe corrosion. These profiles are regulated in EN 13706-1…3. The same applies to the manufacture of GRP reinforcement. The application and properties of these products are regulated by an approval of the respective construction product at the DIBt.
Until recently, one restriction on the use of pultruded GRP profiles was that only straight profiles could be produced in this process.