Fibre Fineness
Physical boundary evaluation establishes the highest yarn count that can be successfully produced from a given quality of raw fiber. Mills determine the spinnable limit to prevent wasting expensive high-grade flax on coarse yarns or attempting to spin low-grade flax too fine. This threshold represents the point where further thinning of the yarn strand causes excessive breaks during spinning.
It is determined by the average fibre fineness and length in the raw material batch.
Spinning Cap
Testing this limit involves producing small trial batches of yarn at increasing yarn counts until the frequency of end downs exceeds acceptable limits. The results are plotted against the fibre properties to find the maximum economical count that the material can support. If a mill tries to spin beyond this cap, the yarn becomes too thin and lacks enough fibres in its cross-section to hold together.
Technical managers use these limits to allocate raw flax shipments to appropriate spinning lines based on order requirements. The determined value is recorded on the raw material sorting sheet to guide inventory allocation.
Quality Boundary
Staying within this boundary ensures high spinning efficiency and reduces the occurrence of yarn defects in the final product. It also optimizes the raw material costs for the spinning mill. This data is reviewed weekly by the production manager.
