Abstract: A take-up apparatus for tape type non-twisted carbon fiber bundles, in which a traverse guide unit consists of an introduction guide roller disposed so that an angle .theta..sub.1 between the introduction guide roller and the axial direction of the bobbin is substantially 90.degree., a final guide roller disposed so that an angle .theta..sub.e between it and the axial direction of the bobbin is -5.degree..+-.10.degree.(i.e., -15.degree. to +5.degree.), and at least one intermediate guide roller disposed between the introduction guide roller and final guide roller so that an angle difference between an intermediate guide roller and an adjacent guide roller is not more than 45.degree.. A take-up apparatus is also disclosed for tape type non-twisted carbon fiber bundles, in which a traverse guide unit has a helically continuing curved guide surface, an initial portion, i.e.

Abstract: A take-up apparatus is disclosed for tape type non-twisted carbon fiber bundles, in which a traverse guide unit consists of an introduction guide roller disposed so that an angle .theta..sub.1 between the introduction guide roller and the axial direction of the bobbin is substantially 90.degree., a final guide roller disposed so that an angle .theta..sub.e between it and the axial direction of the bobbin is -5.degree..+-.10.degree. (i.e., -15.degree. to +5.degree.), and at least one intermediate guide roller disposed between the introduction guide roller and final guide roller so that an angle difference between an intermediate guide roller and an adjacent guide roller is not more than 45.degree.. A take-up apparatus is also disclosed for tape type non-twisted carbon fiber bundles, in which a traverse guide unit has a helically continuing curved guide surface, an initial portion, i.e.

Abstract: A package of a carbonaceous filament strand in the form of a square-end cheese, which is free from "thread dwell" on the shoulders of the package. The package is formed by distributing turning points of the traverse motions in the area near the package ends. Such distribution of the turning points is achieved by repeating two to six kinds of strokes in a cycle of successive traverse motions. The difference between the maximum and the minimum strokes is preferably within a range of 2% to 20% relative to the maximum stroke.

Abstract: Disclosed is a process for producing carbon fibers comprising providing cooling rollers in a 240.degree. to 400.degree. C. oxidative atmosphere, heating a precursor composed of continuous filaments in said oxidative atmosphere while intermittently and repeatedly bringing the precursor into contact with the cooling rollers to thereby convert the precursor to oxidized fibers and carbonizing the resulting oxidized fibers in an inert atmosphere of at least 800.degree. C.

Abstract: A bundle of continuous carbon filament fibers treated with a sizing agent containing as an active component a water-dispersible resin composition consisting of about 65% to 95% by weight of water-dispersible urethane compound having at least one epoxy group and at least one quaternary ammonium group and about 5% to 35% by weight of an epoxy resin. The bundle has an excellent fretting resistance, is extremely handleable, and produces a carbon fiber-reinforced composite material having excellent physical properties.