The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 06, 2026
Filed:
Mar. 22, 2021
Toray Industries, Inc., Tokyo, JP;
Toray Industries, Inc., Tokyo, JP;
Abstract
An object is to provide a production method for a precarbonized fiber bundle and a precarbonization furnace capable of continuously producing the precarbonized fiber bundle for a long period of time by efficiently discharging a decomposition gas containing a tar component generated when performing a precarbonization treatment at the time of carbon fiber production and retained in a heat treatment chamber throughout the heat treatment chamber. The production method for a precarbonized fiber bundle includes allowing an aligned stabilized fiber bundle vertically arranged in one or two or more tiers to travel horizontally in a heat treatment chamber and heat-treating and precarbonizing the stabilized fiber bundle at a maximum temperature of 300 to 1,000° C. using an inert gas supplied from an inlet side and an outlet side of the heat treatment chamber, in which a flow rate ratio Q2/Q1 satisfies Formula (1) below, where Q1 represents a volume flow rate of gas in a first exhaust discharged out of the heat treatment chamber from a position higher than a position of an uppermost tier of the traveling stabilized fiber bundle, and Q2 represents a volume flow rate of gas in a second exhaust discharged out of the heat treatment chamber from a position lower than the position of the uppermost tier of the traveling stabilized fiber bundle:0.01≤21≤0.5 Formula (1).