What Is Pultrusion

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Pultrusion is a continuous moulding process using fibre reinforcement and thermoset resin systems. Preselected reinforcement materials such as fibreglass roving, mat and woven materials are drawn through a resin bath where all materials are thoroughly impregnated.

The wetted out fibre is then formed to the desired geometric shape and pulled into the heated steel die where resin cure is initiated by controlling precise elevating temperatures. The laminate solidifies in the exact cavity shape of the die and is continuously pulled by the pultrusion machine and automatically cut to the desired length.

Process Advantages
The pultrusion process provides flexibility in the design of FRP (Fibre Reinforced Plastic) profiles. Currently profiles up to 2400x500mm are possible. Since the process is continuous, length variations are limited only by transport capabilities.

Specific strength characteristics can be designed into the composite optimising laminate performance for a particular application by strategic placement of high performance reinforcements (such as Carbon or Kevlar fibres). Colour is uniform throughout the cross section of the component.

Processing capabilities inclue the production of both simple and complex profiles, eliminating the need for many post production assembly operations. GRACOLITE profiles can be designed to incorporate several complex shapes into one pultruded component.

Raw Material Examples