The process developed is used to obtain, by compression molding, pieces of thermoplastic material reinforced with long glass fibers, so that the arrangement and orientation of the fibers can be optimized for a specific application. It starts with thermoplastic films reinforced with fiberglass, in which the fibers are left with a marked orientation in the matrix in the direction of flow. We can consider them, therefore, unidirectional laminates (verified by microscopy). Said unidirectional films can be stacked manually or automatically, choosing the most suitable fiber arrangement sequence according to the application and the required thickness, and then forming by compression molding to obtain the desired piece. (Machine-translation by Google Translate, not legally binding)