Predicting Wet Spun Line Tensile Tenacity from Secondary Wall Alignment Data
Secondary wall microfibrillar angle directly limits wet spun line yarn tenacity by setting crystallite load distribution before trough degumming.
Ultimate Fibre Length
Physical Dimension
A physical dimension measures the length of individual single-cell cellulose units that make up the composite multi-cellular flax fibre bundle. The ultimate fibre length represents the fundamental limit to which flax can be divided during intensive chemical or mechanical processing. This measurement governs the potential fineness of the yarn, as shorter ultimate cells limit the yarn strength if the bundle is over-drafted.
It is determined in laboratories using chemical maceration and microscopic measurement.
Mechanical Extraction
The length of these single cells is a genetic and environmental trait of the flax plant, typically ranging from twenty to forty millimetres. In the context of yarn production, the ultimate fibre length is much shorter than the commercial spun bundle, which can be several hundred millimetres long. Wet spinning mills in China control chemical treatments with hot water and alkaline solutions so that the multi-cellular bundles are softened but not entirely reduced to their ultimate cells.
If the bundles are degraded down to their ultimate length, they become too short for the wet spinning frames, resulting in weak and uneven yarn. Maintaining the correct balance between bundle division and bundle cohesion is essential for high-quality yarn.
Spinning Application
Yarn exporters specify the required fibre bundle properties on their raw material datasheets to ensure processing compatibility. Results from the maceration tests are checked before buying raw flax from global agricultural suppliers. This physical dimension dictates the maximum spin limit and the softness of the final woven linen fabric.