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The pultrusion method begins with racks or creels having fiber mat rolls or doffs. The reinforcement is fiberglass, aramid, carbon, or a mixture. This raw fiber is guided through a resin bath that is injected directly into the die.
The raw resin is a thermosetting resin that combines with pigments, fillers and catalysts. The fiber reinforcement is fully impregnated with the resin so that the fiber filaments are saturated with the resin mixture.
As the resin rich fiber leaves the resin impregnation system, the uncured composite material is properly guided through tooling that arranges and organizes the fiber into the right shape. The excess resin is pressed out that is called “debulking.” Constant strand mat and surface are added to enhance the structure and surface finishing.
When the resin impregnated fiber is removed of excess resin, the composite passes through heated steel die. Machined and chromed, this die is heated to a stable temperature as well as has numerous zones of temperature to cure the thermosetting resin. The profile is now a cured pultruded Fiber Reinforced Polymer (FRP) composite.
This FRP profile is pulled by a “gripper” system. Hydraulic clamps or caterpillar tracks are used for pulling the composite through the pultrusion die on a constant base. A cut-off saw is there at the end of machine. The pultruded profiles are cut and stacked for delivery.