Continuous method for producing a thermally stabilized multifilament thread, multifilament thread, and fiber
AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsJens Erdmann, Johannes Ganster
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Abstract
The invention relates to a method for thermally stabilizing melt-spun PAN precursors. For this purpose, the invention provides a continuous method for producing a thermally stabilized multifilament thread made of a meltable copolymer of polyacrylonitrile (PAN), wherein a pre-stabilized multifilament thread is thermally stabilized and in the process at least temporarily stretched. The invention additionally relates to a thermally stabilized multifilament thread which can be obtained according to a corresponding method and to a carbon fiber which is made of the correspondingly thermally stabilized multifilament thread.
Claims17
A continuous method for the production of a thermally stabilised multifilament yarn made of a meltable copolymer of polyacrylonitrile (PAN), in which
- a prestabilised multifilament yarn or a non-prestabilised multifilament yarn is fed continuously,
- in the case of a non-prestabilised multifilament yarn, a prestabilisation and subsequently a neutralisation are implemented, and subsequently
- the prestabilised multifilament yarn is thermally stabilised at a temperature greater than 0° C., wherein the thermal stabilisation is implemented by feeding the multi-filament yarn through at least two ovens which are connected subsequently,
- in at least a first oven, no stretching or stretching <10% and, in at least one further oven, stretching of at least 30% is effected,
- in the at least a first oven, temperatures of 80 to 200° C. being set, and, in the at least one further oven, temperatures of 130 to 270° C. being set, and
- stretching of the multifilament yarn is implemented, at least at times, during, before and/or after the thermal stabilisation.
Dependencies are inferred from the claim text.