Plastic article or earthenware shaping or treating: apparatus – Means applying electrical or wave energy directly to work – Sonic or supersonic wave energy
Patent
1997-08-15
2000-03-07
Simmons, David A.
Plastic article or earthenware shaping or treating: apparatus
Means applying electrical or wave energy directly to work
Sonic or supersonic wave energy
B29C 3508
Patent
active
060332034
ABSTRACT:
Cure and consolidation of a viscous thermoplastic resin, especially one that softens and melts at a high temperature, is improved by assisting autoclave pressurized momentum transport for compaction of the composite using high frequency, low amplitude acoustic vibration within the resin. The vibration induces shear thinning in the resin which promotes resin flow, achieves filling or collapse of voids, and assists consolidation of the composite preform. The vibration is produced with a "shaker table" formed from metal plates sandwiching piezoelectrical transducers. The "shaker table" is coupled to the layup mandrel. The vibration might also be produced as a transducer pad that overlies the preform on the mandrel.
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Christensen Stephen
Stober Eric J.
Hammar John C.
Hopkins Robert A.
Simmons David A.
The Boeing Company
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