| 摘要 |
A flame resistant rendering heat treating device comprising a flame resistan t rendering furnace provided with a heat treating chamber having a plurality o f slits through which polyacrylonitrile fiber strands, parallel-running while being reversed in direction, enter or exit and supplying hot air vertically from above the fiber strands to render them flame resistant and with a hot a ir supplying means, and a plurality of reversing rollers provided on the opposi te outer sides of the furnace, for turning back fiber strands passing through t he slits to return them to the furnace, wherein a clearance between the heat treating chamber's side wall parallel to the direction of fiber strands running in the chamber and fiber strands, or a clearance between a drift prevention plate inserted in parallel to the strands' running direction to between the fiber strands and the side wall and fiber strands is formed to b e up to 150 mm, slits being possibly provided with a heated air supplying mean s.
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