Surface Characterization
Infrared spectroscopy offers a non-destructive pathway to examine the chemical groups on the boundary of yarn or fabric. Utilizing atr-ftir allows the laboratory to probe the outer micron of a textile sample. This localized interrogation yields direct chemical information without requiring complex sample preparation.
The resulting spectral trace captures the immediate state of the fiber surface.
Spectroscopic Mechanism
Electromagnetic radiation passing through a high refractive index crystal undergoes internal reflection to generate an evanescent wave. In employing atr-ftir the specimen is pressed firmly against the crystal surface to facilitate the interaction of this wave with the chemical bonds. The shallow depth of penetration makes the system highly sensitive to surface finishes or coatings.
It measures the intensity of absorbed light at specific wave numbers to generate a diagnostic fingerprint. Tight contact is essential because even a minute air gap attenuates the signal and distorting the relative absorbance heights.
Material Verification
Fibers of differing chemical families yield distinct infrared absorption bands that enable rapid sorting. Identifying synthetic polymers through atr-ftir provides a reliable check for composition claims on incoming fabric shipments. This method distinguishes nylon from polyester or acrylic within minutes.
It identifies polymer classes without the need for chemical dissolution.
Process Audit
Chemical finishing alters the surface properties of textiles to impart water repellency or flame retardancy. Mill quality teams apply atr-ftir to verify the presence and uniformity of these treatments across the width of the fabric. This routine check detects uneven chemical application before the goods enter the cutting room.
Consistency in chemical distribution remains essential for garment performance.
