Pultrusion is a very important process to produce different composite parts are structures with continuous fibers and resin impregnations. Here we explain what is the pultrusion process and what are the process steps of the pultrusion process.
Also, you will find information about which materials are generally used and what types of products are produced with the pultrusion process.
In most basic expşanation, the pultrusion process is the method that continuous fibers are impregnated with the resin and shaped with consecutive die opening.
First of all, continuous fibers are unwound from the reels with the help of a bunch of pulleys.
With the help of these pulleys, the unwound continuous fibers are dipped inside the resin bath in which, the resin is uncured.
The continuous filaments are brought together and passed through a pre-formed die. In this pre-former die, several filaments that are impregnated with the uncured resin are brought together to form solid unitary rod-like shapes.
After this pre-former die, the rod-like continuous part is pulled through the main die. In this main die, the uncured impregnated resin is cured via heat application inside this die, and a solid continuous part is obtained.
In general, after this die puller rollers exist. Thes rollers are continuously taking the filaments, which is the excitation of the movement of all systems.
At the end of the pultrusion process, a special blade cuts the continuous pars into desired lengths.
As we stated above, thermosetting resins are generally used for the impregnation of the continuous fibers. These thermosetting resins are generally; epoxies, silicones, and polyesters. But epoxies generally problematic in the die sections because of the sticking.
As reinforcement material, e-glass fibers are used. These glass-fibers are very important to increase the tensile strength of the produced parts.
In general, structural parts are produced for different duties. For high-voltage works, these pultrusion parts are used as tool handles. Solid-rods are also very important structural parts. Third-rail covers of subways also important applications.
Thin sectioned sheet and film parts can be also produced with the pultrusion process.
General characteristics of the pultrusion process can be explained like this.
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