US 2023/0087214 A1Published application

Method for splitting carbon fiber tow

OwnerHao-Chia WU, Yu-Jie WUinventors

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Abstract

Provided is a method for splitting a carbon fiber tow, which comprises heating a carbon fiber tow sized with a first sizing material to soften the first sizing material and form a spread carbon fiber tow; passing the spread carbon fiber tow through at least one splitter and corresponding cutter to obtain multiple carbon fiber strands spaced apart; and sizing the carbon fiber strands with a second sizing material. With the method, multiple small carbon fiber tows having better tensile strength and/or modulus than the commercially available small carbon fiber tow products can be obtained. Products made of the small carbon fiber tows obtained by the present invention are lighter but stronger, and the production cost is relatively reduced. The present invention also achieves the purpose of energy saving and carbon reduction.

Claims20

Dependent claims

A method for splitting a carbon fiber tow, comprising:

(A) providing a carbon fiber tow comprising multiple carbon filaments sized with a solution containing a first sizing material;
(B) passing the carbon fiber tow through a first heating device to heat the carbon fiber tow at a temperature of between 45° C. and 140° C., so as to soften the first sizing material and form a spread carbon fiber tow;
(C) adjusting the tension of the spread carbon fiber tow;
(D) passing the spread carbon fiber tow through at least one splitter to obtain a plurality of multiple carbon fiber strands spaced apart;
(E) passing the spread carbon fiber tow through at least one cutter to cut the carbon filaments connected between the carbon fiber strands;
(F) adjusting the tension of the carbon fiber strands;
(G) sizing the carbon fiber strands with a solution containing a second sizing material to obtain multiple sized carbon fiber strands;
and
(H) passing the multiple sized carbon fiber strands through a second heating device to heat the sized carbon fiber strands to obtain multiple split carbon fiber tows.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/482,416Filed 22 Sep 2021
Published: 23 Mar 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

D02G 3/16
Yarns or threads characterised by the material or by the materials from which they are made: yarns or threads made from mineral substances
D06M 15/233
Of hydrocarbons, or reaction products thereof, e.g. afterhalogenated or sulfochlorinated: aromatic, e.g. styrene
D06M 15/227
Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds: of hydrocarbons, or reaction products thereof,…
D06M 15/31
Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds: of unsaturated nitriles

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