Delivery of pitch/thermoplastic/thermoset resins in RTM systems
US7025913B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2003 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Feb 12, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Resin or pitch is melted in a melt blender apparatus (11) and then loaded, into a heated jacketed holding tank (12). A pair of feed lines (14, 16) receives resin from the holding tank (12) and feeds an upper gear pump (15) and a lower gear pump (17). A mixing enhancement such as a static mixer (18, 19) is located in each of the feed lines (14, 16) between the gear pumps (15, 17) and the resin delivery ends (25, 26) of the feed lines. The resin-melt feed lines may be equipped with pressure indicators (27, 28, 32, 34) and pressure relief valves (23, 24). The resin-melt feed lines may also be equipped with pump accumulators (31, 33). Resin melt pressure created by the gear pumps (15, 17) forces a piston inside the accumulator back to the desired position. The accumulators (31, 33) can also be used to maintain constant pressure in the feed stock. Resin can be recycled from the accumulators (31, 33) into the melt blender (11).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.