Application of on-line analysis and monitoring system adopting near-infrared spectroscopy in the production of prepreg

The on-line determination conducted of resin content, the volatile content and the soluble resin content of a kind of phenolic prepreg were conducted by near infrared diffused reflectance spectrum. Partial least square method was used to build calibration models and chose spectral preprocessing methods as well as number of PLS factors. The t-test results show that there is no significant difference between the near infrared method and the standard method for unknown samples. The NIR spectroscopy method can be used to predict three indexes simultaneously. Besides, the prepreg can be analyzed within than 1 min without to the destruction sample by NIR. The quality prepreg of can be controlled properly by adjusting the technical parameters. The study indicates that the NIR method can sufficiently perform accurate and effective analysis on the quality of prepreg.