Integration of Reed Width Contraction and Loom Crimp Take up in Linen Weaving
Reed width contraction and warp crimp take-up in linen weaving require dynamic adjustment of loom tension and denting space to offset flax inelasticity.
Bast Fiber Elasticity
Tension Recovery
Mechanical response of natural plant fibers to pulling forces determines their behavior during spinning and cloth production processes. High bast fiber elasticity refers to the ability of flax and similar stalk-derived fibers to return to their original length after the release of tensile stress. Because flax fibers possess a highly crystalline molecular structure, they exhibit much lower elasticity than cotton or synthetic fibers.
Strain Limit
Tensile testing machines measure this property by stretching a fiber bundle until it reaches its elastic limit, beyond which permanent deformation occurs. In Chinese flax mills, the raw material is graded partly on this tension recovery profile to ensure it can withstand the high-speed winding and unwinding forces of modern ring spinning frames without snapping. Maintaining a high level of humidity in the storage and spinning rooms is necessary to preserve what little natural elasticity the flax fibers possess before they are formed into heavy fabrics.
Spin Performance
Spinning efficiency decreases when the fiber batches display low recovery under tension, as this leads to frequent yarn breakages and machine downtime. The measured values are logged on the fiber inspection sheet before the yarn is sent to the loom room. This material property ultimately dictates the tensile strength of the loomed greige fabric.