Calibrating High-Speed Spectroscopic Arrays for In-Line Polyolefin Film Contamination Detection
Calibrate high-speed InGaAs spectroscopic arrays using two-point reference standardization to detect and eject clear polyolefin film in blowroom chutes.
ISO 1833-1 Chemical Dissolution
Blend Quantification
Quantitative analysis of fiber mixtures is performed by selectively dissolving one component to determine the dry mass percentage of the remaining fiber. In testing laboratories, ISO 1833-1 chemical dissolution provides the standard method for separating binary textile blends, such as cotton and polyester. This standard establishes the general principles and calculations used to analyze fabric composition for regulatory labeling.
Dissolution Procedure
The technician dries the fabric sample to a constant weight to remove moisture before exposure to the solvent. For a cotton and polyester blend, the specimen is treated with hot sulfuric acid, which dissolves the cotton while leaving the polyester intact. The remaining residue is then collected by filtration, washed, dried, and weighed.
Moisture Correction
Calculating the percentage of each fiber requires applying a correction factor to account for the loss of the insoluble fiber during the extraction. Many fibers experience a minor loss of mass when exposed to harsh chemical reagents. The standard specifies these percentage correction factors for each fiber combination to ensure calculation accuracy.
Material Limitation
This extraction method cannot be used if both fibers in the blend are soluble in the same reagent, as is the case with certain acrylic and modacrylic mixtures. When analyzing such blends, the laboratory must use mechanical separation or alternative solvent systems specified in other parts of the standard series. Correct identification of the fiber types must precede the chemical treatment to prevent complete sample destruction.