Air press
US6306258A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 26, 2000 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Sep 26, 2020 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F1/48
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A pressurized box is positioned opposite a vacuum box. The pressurized box has a leading cross machine direction baffle with a ceramic shoe which engages a forming fabric, and a trailing cross machine direction baffle of similar construction. Two end deckles complete the pressurized box. The leading cross machine direction baffle presses against a resilient seal which causes a web contained between upper and lower forming fabrics to wrap about the baffle shoe a few degrees forming an effective end seal which does not allow air to bypass the baffle. The trailing cross machine direction baffle is positioned over a vacuum box which prevents air from leaking around the trailing baffle. A vacuum box draws air through the forming fabrics and the web, from the pressurized box increasing the total pressure gradient across the web to 20 to 30 psi or more. The pressure box and opposed vacuum box form an air press. The pressure box is positioned and held against the forming fabrics by opposing air tubes. An alternative embodiment utilizes a suction roll positioned beneath the pressure box and having a suction gland positioned beneath the portion of the roll which backs the pressure box.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.