Measuring Cyclic Oligomer Content in Synthetic Filament Extracted Yarns
Solvent extraction coupled with liquid chromatography isolates synthetic yarn cyclic oligomers to set strict delivery specs and stop knitting deposit failures.
Gravimetric Residual Determination
Residue Analysis
A chemical assessment method calculates the weight of extractable substances on a fabric by drying and weighing the chemical residue left after solvent evaporation. Laboratory personnel use gravimetric residual determination to measure the amount of spinning oil remaining on scoured yarn. This process checks the effectiveness of the industrial washing steps before the fabric continues to printing.
By establishing the precise quantity of remaining lubricants, the mill can adjust surfactant concentrations in the wash bath.
Measurement Process
The sample is extracted with an organic solvent which dissolves the oils and waxes. Heating the solvent until it evaporates leaves the dry residue behind for weighing. This residue weight is divided by the original sample weight to calculate the finish percentage.
Mill Checkpoint
High residue levels can block dye molecules, which creates color inconsistencies on the finished apparel. Mills set maximum allowable finish levels to avoid these issues. This test confirms the fabric is clean enough for uniform dyeing.
Testing Precision
This technique requires accurate scales and complete solvent evaporation to prevent measurement errors. Samples must sit in a desiccator before weighing to prevent the absorption of moisture from the air. Controlling the testing environment ensures consistent results.