Composite tubular article and process for producing the same
US5411779A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1991 |
| Grant date | May 2, 1995 |
| Priority date | — |
| Expiry date | Mar 21, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31721
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a composite tubular article for use as the fixing belt in an image-forming device such as a copying machine etc., particularly as a fixing belt suited for thermal fixing, and also relates to a process for producing the same. Conventionally known as an image-fixing belt is a belt consisting of a polyimide resin as the inner layer and a fluoroplastic as the outer layer. However, this fixing belt has problems that clear images cannot be obtained because the thickness of each layer is uneven, and that unglossed, so-called matt images cannot be obtained because the belt surface is smooth. This invention provides a composite tubular article comprising a tubular inner layer made of a polyimide resin and a tubular outer layer made of a fluoroplastic, the outer circumferential surface of the fluoroplastic tubular outer layer having a surface roughness of 1 to 10 .mu.m. The invention further provides, as a production process for the same, a process in which the outer layer is formed by use of a cylinder having an inner circumferential surface with a surface roughness of 1 to 10 .mu.m, and a polyimide-resin tubular inner layer is formed on the inner circumfere…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.