Method for modifying the tension of a canvas
US6347466B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 2001 |
| Grant date | Feb 19, 2002 |
| Priority date | — |
| Expiry date | May 15, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB44D3/185
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A method includes steps for modifying tensile stresses in an unpainted canvas that is mounted on a frame under applied tensile stresses. The canvas is formed of material that can undergo heat-shrinking when at or above a thermoplastic shrinking temperature, and can undergo heat-softening when at or above a thermoplastic softening temperature. The method includes heating the canvas to a temperature at or above the thermoplastic shrinking temperature and the thermoplastic softening temperature. The method further includes maintaining the canvas at a temperature at or above the thermoplastic shrinking and softening temperatures. This induces heat-shrinking, and thereby increases the tensile stresses in any portions of the canvas in which the applied tensile stresses are less than the opposing stresses of the heat-shrinking. This also induces heat-softening, and thereby decreases the tensile stress in any portions of the canvas in which the applied tensile stresses are greater than the opposing stresses of the heat-shrinking. The method further includes subsequently cooling the canvas to a temperature below the thermoplastic shrinking and softening temperatures, whereby the canvas beco…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.