Method for converting multidimensional sheet structures consisting of polyacrylonitrile fibres into the thermally stabilized stage
US5853429A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 1997 |
| Grant date | Dec 29, 1998 |
| Priority date | — |
| Expiry date | Jul 11, 2017 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F9/225
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Method for converting two-dimensional or three-dimensional sheet structures consisting of polyacrylonitrile fibres or substantially of polyacrylonitrile fibres, such as woven fabrics, layered materials, knitted fabrics, felts, or non-woven fabrics, into the thermally stabilized but non-carbonized state, by means of an oxygen-containing or oxygen-yielding gas flowing through the respective sheet fibre structure. This gas or gas mixture is used as a medium for the temperature control in the sheet fibre structure and as a means for supplying the oxygen carrier and also removing the gaseous reaction products. Temperature and flow velocity of the gas/gas mixture are matched to the stabilization characteristic of the respective sheet fibre structure and are controlled precisely. The device used for carrying out the method consists of a furnace (23) which consists of at least one chamber, through which furnace a web of the sheet fibre structure (18) is moved continuously. During this transportation the oxygen-containing or oxygen-emitting gas flows through the sheet fibre structure (18) in a controlled manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.