Determining Dry Mass Ratios in Cotton Synthetic Blends
Determining dry mass ratios requires desiccation at 105 °C, selective chemical dissolution under ISO 1833, d-factor correction, and commercial regain adjustments.
Blowroom Blending Drift
Fibre Distribution
A production inconsistency occurs when the ratio of different fibers being mixed changes over time during the initial opening and cleaning stages. In spinning mills, blowroom blending drift leads to variations in the physical properties of the yarn produced from the same batch. This phenomenon is monitored closely at the start of the yarn prep line to prevent downstream errors in dye uptake.
The analysis terminates if the raw fiber feed is completely homogeneous.
Mechanical Performance
Inaccurate dosing occurs when mechanical weighpans or continuous volumetric feeders fail to discharge fibers at a constant rate. Heavy tufts can stall the opening rollers, causing a temporary shortage of one component in the blend. The system must maintain uniform feed pressure to keep the ratio stable.
Process Variance
Varying fiber densities also disrupt the consistency of the air flow transport system. Lighter fibers move faster than heavier ones, leading to separation along the ducting line. This separation alters the composition of the fiber mix before it reaches the carding machine.
Quality Consequence
Spun yarn produced under these unstable conditions suffers from uneven dye uptake and variable tensile strength. Fabric woven from such yarn may exhibit barre defects, which are bands of different color shades across the fabric width. Monitoring the blend ratio at regular intervals prevents these costly textile rejects.