Abstract: A process for producing a carbon fiber tow from an acrylic fiber tow wherein the acrylic fiber tow is treated to uniformily contain throughout the two (1) an aminosiloxane and (2) a chemical substance selected from glycerine, an alkylene glycol, and a polyalkylene glycol prior to heat-treating said acrylic fiber tow to produce the carbon fiber tow whereby problems such as fluffiness, spreading, and filament breakage are diminished.

Abstract: A method for the continuous production of carbon fibers from two or more cheese-like articles of organic polymer fibers having yarn ends at the top portion and tail portion, characterized by preliminarily heat-treating the yarn ends of each cheese-like article, connecting the tail end of a cheese-like article with the top end of another cheese-like article in such a manner that connecting loop portions and knot portions are disposed at different positions, and thereafter causing the yarn to pass through heat-treating furnaces.

Abstract: A process is provided for producing carbon fibers characterized by fixing a specified amount of a chemical substance onto thermally stabilized fibers and/or carbonized fibers to impart good collectivity and then carbonizing and/or graphitizing the fibers, said chemical substance selected from one or more of the compounds of glycerin, polyethylene glycol, polypropylene glycol and alkyl derivatives thereof.

Abstract: The present invention relates to a process for producing carbin fibers which involves thermally stabilizing and carbonizing or graphitizing acrylic fibers containing 0.1-5 weight %, based on the weight of the fibers, of a straight chain silicone substance and further containing 0.1-5 weight %, based on the weight of the fibers, of a chemical substance which is selected from glycerine, polyethylene glycol, polypropylene glycol, alkyl derivatives thereof, and mixtures or compounds of two or more of these substances, and which generates only a residue less than 5 weight % under the action of heat at 240.degree. C. for one hour. According to applicant's invention, such problems as fluffiness, spreading, filament breakage etc. can be greatly reduced and it is possible to produce fibers free from agglutination or fusion and having high strength and high modulus of elasticity by heat-treatment in a short time.