PULTRUSION

Pultrusion is an automated system for the continuous pull extrusion of profiles with a stable and complex section and with curing in closed die.

The process of pultrusion ensures the repeatability and the perfect reproducibility of the manufactured product.

The impregnation of fibers with thermosetting resins, such as polyester, vinyl ester, epoxy, phenolic occurs through an open tank or through direct injection in the most technologically advanced systems.

1. The reinforcing fibers are carefully placed into a pre-mould according to the structural requirements of the end profile.
2. These are impregnated through the open tank and then they are pulled into a precision steel die. Alternatively they are impregnated in the closed die by a direct-injection system. The impregnation system with direct injection ensures higher properties of solidification and of density compared to the open-tank method.
3. The die is heated by a computerized system which controls the curing process in every step and the optimal speed rate the profile. During the polymerization process or curing process the final geometry of the profile is defined. The profile is ready for cutting as it leaves the die..

The reinforcements are composed of composite systems with roving, filaments glass mats, carbon or Kevlar mats and they are arranged lengthways in the pull direction.
They make up about 70% of the profile and guarantee a high tensile and flexural strength very similar to steel.

The transverse resistance is ensured by the combination between tissue, mats and roving random.

The Pultrusion system is environmentally friendly. This production process is still slow, but the total energy consumption necessary for the production of a profile is 1/6 of what it is necessary for the same production of aluminium.