Depending on the part size, the pull forces can be as low as 200 pounds to as high as 100,000 pounds.
The final step in the pultrusion process is to cut the part to length without stopping the line. The traveling cut-off saw accomplishes this by moving at the same speed as the part as it makes the cross cut. Once the cut is made, the traveling cut-off saw goes to its “home” position before the next cut is triggered.
The pultrusion processing parameters, such as die zone temperatures, line speed, part cut length and gripper forces, are typically set and changed at a control panel or touch screen. Each part will have unique processing requirements that can be readily modified by the machine operator.
One of the most familiar pultruded parts is the rails of fiberglass ladders. This relatively simple shape has been manufactured using pultrusion since 1959. Pultruded parts today can be much larger and more complex, utilizing a wide range of resin systems, reinforcements and processing methods.