Pultrusion – pultruded
Pultrusion or pulling profiles is a process technology where (glass) fibres together with a resin are pulled through a die. There are shaped cavities in the die that give the product its shape.
Pultrusion: fibres and resins
So-called ‘thermosetting’ resins (e.g. UP resin and EP resin; components / polyester resin) are used for the pultrusion process. The fibres used are mainly fibreglass strands.
The pultrusion technology is basically suitable for a wide range of fibre types or combinations of fibre types. Moreover, different types of resin can be used for pultrusion. The combination of resins and fibres provide the product with a desired strength. A high fibre volume will, for example, provide the product with a high specific strength and rigidity.
The resins hold the fibres together and ensure that the compressive forces and shear stresses are transmitted. The fibres ensure the transmission of the shear stresses. Pultruded products also have good mechanical and thermal properties (fire-resistant, fire-retardant)
Very accurate shapes and sizes with nicely aligned fibres and a perfect smooth surface can be achieved with the pultrusion process.
Pultrusion techniques allow for a wide range of profiles (including fibreglass reinforced plastic profiles) to be pulled. These profiles can subsequently be processed into products that include: FRP ladders, FRP landings, FRP grating and loadbearing FRP constructions.
Pultruded grating is often used with large spans and/or high loads, in the heavy industry with chemical, aggressive and corrosive conditions. Pultruded grating is highly fire-resistant. More information about pultruded FRP grating.
A material made from different components is also called a composite. A composite is usually a fibre-reinforced FRP.