PTIR™ Prepreg Technology (patent pending)

Heating Mechanism

Carbon reinforced composites contain carbon fiber that has a very high thermal conductivity of 700~1600 W/m•K impregnated with a polymer resin matrix that has a very low thermal conductivity: Epoxy 0.19 W/m•K, Vinyl ester 0.25 W/m•K, PEEK 0.24 W/m•K, PEI 0.23 W/m•K and PPS 0.28 W/m•K.

This difference in conductivity can cause difficulty in controlling uniform process heating and bulk low conductivity requires a long heat processing time in composite manufacturing.

The majority of composite processing heating methods rely on thermal conduction to heat the composite from the outside to the inside.

Heat transfer by conduction follows Fourier's Law: Reduced thickness and increased heat transfer area will increase thermal conductivity and produce faster and more efficient heat transfer times.

The PTIR™ Prepreg and P-Wave™ heating method can generate rapid volumetric heating within and throughout the composite structure, independent of heat conduction, for very fast heating and composite consolidation.



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