Method for producing duct-integrated floor-raising material
US9180619B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2012 |
| Grant date | Nov 10, 2015 |
| Priority date | — |
| Expiry date | Jul 27, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/732
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for producing a duct-integrated floor-raising material includes the steps of: forming a first enclosed space, a second enclosed space, and a third enclosed space, having a molten tubular parison pressed flat and extruded from pinch-off portions by a pair of split molds, wherein portions of the parison corresponding to the pinch-off portions are welded to each other; molding the first hollow portion, the second hollow portion, the duct portion, and the waste bag in which a blow pin is pierced to outer surfaces of the tubular parison corresponding to the spaces, a pressurized fluid is blown to expand the parison, and the tubular parison is pressed against the surfaces of the split molds for shaping the parison; and cutting the waste bag to form an air intake port or an air outlet port on the duct portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.