Carbon fiber precursor acrylic fiber bundle, method for thermally oxidizing part thereof, thermal oxidation oven, and process for producing carbon fiber bundle
US9738994B2 · kind B2 · utility
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4References
14Claims
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Key dates
| Filing date | Apr 12, 2013 |
| Grant date | Aug 22, 2017 |
| Priority date | — |
| Expiry date | Apr 12, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27D2007/063
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A carbon-fiber-precursor acrylic fiber bundle which can smoothly pass through a flame-resistance impartation step and a carbonization step. The carbon-fiber-precursor acrylic fiber bundle has a high-density part as a portion thereof, wherein the high-density part satisfies the following requirements (A) and (B). Requirement A: The high-density part has a maximum fiber density ρmax of 1.33 g/cm3 or higher. Requirement B: The portion extending between an intermediate-density point and a maximum-density-region arrival point has an increase in fiber density of 1.3×10−2 g/cm3 or less per 10 mm of the fiber bundle length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.