Pultrusion is a continuous process for manufacture of fibre-reinforced plastics with constant cross-section. The term is a portmanteau word, combining "pull" and "extrusion". As opposed to extrusion, which pushes the material, pultrusion pulls the material.
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In the standard pultrusion process the reinforcement materials like fibers or woven or braided strands are impregnated with resin, possibly followed by a separate preforming system, and pulled through a heated stationary die where the resin undergoes polymerization.
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As the materials are pulled through a die in the standard pultrusion process the process is only suited to manufacture straight profiles.

In a recently developed modification of the process, developed and patented by Thomas GmbH + Co. Technik + Innovation KG, the die is no longer stationary but moving back and forth along the profile to be manufactured. This modified process, known as "Radius-Pultrusion" allows also to manufacture two- and three-dimensional curved profiles. It also is beneficiary for a number of tasks in the linear process especially if quite complex textile reinforcements with a low rate of distortion are needed.
https://en.wikipedia.org/wiki/Pultrusion

La pultrusion permet la production de profilés de section constante en grande série. Leur forme peut être simple (tube, lamellé plat, jonc, parallélépipède, etc.) ou plus complexe. Exemples : cannes à pêche ou de golf, manches d'outil.
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Le fonctionnement général peut se résumer ainsi : le renfort (tissu, mat, fibres) conditionné en bobine et imprégné de résine thermodurcissable ou de polymère thermoplastique est tiré à travers une longue filière chauffée qui contrôle la teneur en résine ou polymère et détermine la forme de la section. Le passage dans ce four va ainsi provoquer la polymérisation de la résine ou la fusion du polymère et donner la forme finale. Le produit est ensuite coupé à la longueur souhaitée. Ce procédé est plus lent que l'extrusion.
https://fr.wikipedia.org/wiki/Pultrusion