Process for the production of an endless carbon fibre (20, 60) for use in composite materials (50) with improved moldability, the process includes:Integration of a wide range of discrete areas (22, 62, 84, 94, 104, 114, 222) into an infinite precursor phase, comprising a polymer material, into which the infinite precursor phases after heating for carbonisation and graphitization an infinite carbon fibre (20, 60) with a variety of discrete, weak areas, corresponds to the variety of discrete areas (22, 62, 84, 94, 104, 114, 222),characterized by the fact that the polymer material is an acrylic polymer material and the integration of the multitude of discrete, weak areas (22, 62, 84, 94, 104, 114, 222) furthermore, the formation of a stream of an acrylic polymer material and the temporary introduction of a second different polymer material (144) into the stream (160, 220) includes the formation of a heterogeneous precursor phase, in which the multitude of discrete areas (22, 62, 84, 94, 104, 114, 222) includes the multitude of discrete, weak areas (22, 62, 84, 94, 104, 114, 222) formed after heating the heterogeneous pre-stage phaser.
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