Determining Flax Staple Profile Using Manual Comb Sorting
Manual comb sorting by ISO 2370 isolates technical flax bundle length profiles to prevent drafting waves, control short fibre content, and enforce purchase contracts.
Ultimate Fibre Cell
Structural Unit
Bast fibres from the flax plant exist as complex bundles of microscopic cells held together by natural pectin compounds. The ultimate fibre cell is the individual, single-celled component that forms the basic building block of these larger composite bundles. This microscopic cell must be liberated during the spinning preparation process to achieve the finest possible yarn counts.
Physical Property
Microscopic analysis shows that these cells are elongated, thick-walled cylinders with a narrow central cavity. The dimensions of each ultimate fibre cell, especially its length-to-diameter ratio, dictate the maximum flexibility and fineness of the spin. Chemical treatment and wet spinning processes help to soften the binding pectins, allowing the bundles to slide apart into these individual cells.
This separation is key to producing smooth and supple linen fabrics.
Spinning Limit
Dry spinning methods cannot separate these individual cells and instead produce yarns composed of thick, stiff bundles. Wet spinning lines, however, use heat and water to exploit the small size of the ultimate fibre cell, producing very fine yarns suitable for high-quality clothing. The limits of yarn fineness are governed by the length of these cells, as shorter cells cannot transfer tensile load effectively without a high twist.
This anatomical structure therefore defines the boundary between coarse tow utility fabrics and fine apparel linens.