Process for measurement of the degree of cure and percent resin

Details Process for measurement of the degree of cure and percent resin Process for measurement of the degree of cure and percent resin

1994-05-06

1995-10-10

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503411, G01N 2135

Patent

active

054573190

ABSTRACT:
The degree of cure and the amount of epoxy resin in a glass fiber reinforced epoxy resin prepreg is measured by exposing the prepreg to a series of light pulses created by optical filters transmitting light at predetermined bandwidths about selected wavelengths, preferably centered at wavenumbers of about 4529 cm.sup.-1 and 4055 cm.sup.-1 and measuring the amount of epoxy groups and methyl groups present relative to reference values from the electrical pulses produced by a phase sensitive photoelectric detector disposed to receive said light pulses after being exposed to said prepreg. When such measurements are made in a continuously moving sheet of prepreg, it is possible to control the variation of percent cure and resin content to no greater than .+-.3% cure and .+-.3% resin content over a distance of at least 400 yds (366 m).

REFERENCES:
patent: 3970393 (1976-07-01), Krygeris et al.
patent: 4582520 (1986-04-01), Sturm
patent: 4609628 (1986-09-01), Aschenbeck
patent: 4769544 (1988-09-01), Dahlquist
patent: 5142151 (1992-08-01), Varnell et al.

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