Yarn conditioning

Yarn conditioning is fixing the amount of moisture in the yarns. It is possible by conditioning them in a humidified environment.
Moisture regain.
Different textile fibers have distinct moisture regain. For example, Cotton has a moisture regain of 7%, and silk has 11%.
Moisture content.
In yarn, it is the moisture present in the yarn as a percentage of the total weight of yarn and moisture. Moisture content is one of the important test.Textile materials pass through several manufacturing stages. For instance, during yarn manufacturing, the moisture content in yarn becomes lowered that may create several negative impacts on various yarn properties. Moisture affects the physical properties of the material; hence it is crucial to maintain the moisture percentages. Yarn conditioning after manufacturing ensures the moisture regain before commercially selling the materials, and it adds flexibility and better characteristics for further manufacturing stages such as fewer breakages of yarn, and knots.
Importance of moisture.
The presence of water plays a crucial role in the mechanical behavior of natural fibers. Hydrated, biopolymers generally have enhanced ductility and toughness. Water plays the role of a plasticizer, a small molecule easing passage of polymer chains and in doing so increasing ductility and toughness. When using natural fibers in applications outside of their native use, the original level of hydration must be taken into account. For example when hydrated, the Young’s Modulus of collagen decreases from 3.26 to 0.6 GPa and becomes both more ductile and tougher. Additionally the density of collagen decreases from 1.34 to 1.18 g/cm^3.