Duct and method for its manufacture
US10436355B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2016 |
| Grant date | Oct 8, 2019 |
| Priority date | — |
| Expiry date | May 21, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D23/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A duct of fiber material and binder agent, at least two fold lines are present lengthwise for providing a foldability of the duct by weakened material along the fold lines. The duct is pushable into a folded state and the material remembers the original shape and return to its original shape when released from a folded state. A method of manufacturing a duct: applying a web of origin fiber material with binder agent to a core and compressing the web by an outside form under the influence of heat against the core, wherein the core and/or the outside form is provided with a number of lengthwise ridges corresponding to the desired number of fold lines, to a third of the original thickness of the sides and at the ridges a tenth to a twentieth of the original thickness, and in that the fiber and binder agent web weighs 1.5-3 kg/m2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.