HEAT-TREATMENT FURNACE, MANUFACTURING METHOD FOR FLAME-RESISTANT FIBER AND MANUFACTURING METHOD FOR CARBON FIBER

摘要

PROBLEM TO BE SOLVED: To provide a heat-treatment furnace for producing flame-resistant fiber which can prevent an outflow of toxic decomposition gas generated within the heat-treatment furnace as well as the entrance of an outside air into the furnace and which can reduce energy cost and have high quality.;SOLUTION: A heat-treatment furnace is provided with a heat treatment chamber 2 having a heating gas introduction part and a heating gas discharge part, seal chambers 3 for suppressing the leakage of heating gas from the heat treatment chamber and seal buffer chambers 4 installed on the outside of the seal chambers. The seal chamber is capable of circulating heating gas in a vertical direction relative to a running direction of an object to be processed, and the seal buffer chamber has a discharge part for discharging heating gas on the side facing an introduction part for introducing heating gas. In the heat-treatment furnace, a channel is installed so that the gas discharged from the seal buffer chamber can be introduced out of the system without being circulated in the heat treatment chamber, the seal chamber and the seal buffer chamber and cannot come into contact with a line of thread again.;COPYRIGHT: (C)2012,JPO&INPIT