Introduction
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| taken form google |
- The properties of textile fibers are strongly affected by the atmospheric moisture content.
- Many fibers, particularly the natural fibers are hygroscopic in nature and they will absorb moisture if kept in a humid atmosphere.
- Conversely, they will tend to lose moisture in a dry atmosphere (a process known as desorption.)
- Hydrophobic fibers (e.g. Polyester) are those which do not absorb moisture if kept in a humid atmosphere.
Significance of moisture absorption
- The importance of moisture relations cannot be overstated. Almost all the physical properties of fibers, yarns and fabrics are influenced by the presence of moisture.
- The presence or absence of moisture can effect dimensions, mechanical strength, elastic recovery, rigidity and so on .
Moisture and Fibre Properties
Dimensions: Swelling in diameter, fabric shrinkage occurs due to fibre swelling.
Mechanical properties: (cotton and flax) an increase in strength is noticed when moisture absorbed by the fiber.
Electrical properties: The 'before and after' effect of moisture on the electrical resistance of textile material is most striking.
Thermal effect: Absorption of moisture results generation of heat, i.e. ‘Heat of absorption.
In winter from a hot room (low RH %) to outside (cold and high RH%) heat generation balancing of heat, otherwise body would suffer.
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