Pultrusion is a continuous process used to manufacture continuous fiber, constant profile composites. Polyurethane offers superior processing and mechanical properties when compared with other matrix materials such as vinyl ester and epoxy.
Pultrusion with BASF Polyurethanes
In polyurethane pultrusion, continuous fibers are drawn into a closed injection box into which the mixed chemistry is introduced. Fully wet-out with polyurethane, the fibers travel into a shaped die for forming and curing. Segmented heating zones in the die allow for controlled reaction of the polyurethane such that the profile is fully cured as it exits the die. Mechanical grippers work in a hand-over-hand fashion to pull the profile through the process in a continuous fashion.
Pultruded profiles are becoming the go-to solution for a wide range applications including automotive structures (e.g. door intrusion beam, bumper beams, roof bows), industrial applications (e.g. window profiles, storage racks, solar panel frames), construction (e.g. rebar, seawalls) and many, many others.