Delivery of pitch/thermoplastic/thermoset resins in RTM systems

Details Delivery of pitch/thermoplastic/thermoset resins in RTM systems Delivery of pitch/thermoplastic/thermoset resins in RTM systems

2006-04-11

2006-04-11

Kuhns, Allan R. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

C264S102000, C264S257000, C264S321000, C264S328400, C425S129100, C425S145000, C425S217000, C425S557000

Reexamination Certificate

active

07025913

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).

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