Thermal Softening
The process of making textile fibers more pliable and moldable through the application of heat, moisture, or chemical agents improves their processability. In linen production, yarn plasticization is achieved by exposing the stiff flax fibers to warm water or steam during the wet-spinning process. This treatment softens the natural pectin that binds the cellulose fibers, allowing them to slide past each other more easily.
Spinning technicians record the temperature of the water bath in the spinning log to control this softening.
Spinning Efficiency
Without this treatment, the high crystallinity of flax makes the fibers too brittle to spin into fine, high-quality linen yarns. The occurrence of yarn plasticization increases the flexibility of the fibers, enabling the production of fine, uniform yarns with fewer defects. It also helps to align the fibers parallel to the yarn axis, which increases the yarn’s final tensile strength.
Operators must monitor the water temperature and dwell time in the wet-spinning trough to prevent over-softening of the pectin. The results of these process audits are filed in the spinning mill’s weekly production report, which ensures that each spun batch meets the required strength and hairiness standards.
Fabric Weavability
Plasticized yarns are easier to weave because they conform more readily to the crimped structure of the fabric on the loom. This behavior is documented in the yarn’s physical data sheet. Proper plasticization reduces warp yarn breakages during the shedding cycle.
