Blend analysis of different polymer fibers can be analyzed with NIR spectroscopy as well. Real-time analysis of the application of polyvinyl alcohol (PVA or PVOH) sizing to warp yarn has been done with NIR online process analyzers. Common fibers identified with NIRS include: cotton/linen, merchandized cotton, acrylic, modified acrylic, acetate, triacetate, Nomex
®, Kevlar
® (K-29, K49, and K129), nylon-6, nylon-6,6, silk, polyester, cationic and disperse dyeable polyester, polypropylene, PVA and PVC.
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