What are the effects of relative humidity on the properties of textile fibers

　　1. Relationship between relative humidity and strength

　　Relative humidity has a great influence on fiber strength, which can enhance and improve the whole degree of long chain molecules and increase the strength. Take cotton fiber for example, when the relative humidity is 60-70%RH, its strength can be increased by about 50% compared with dry state.

　　2. The relationship between relative humidity and softness

　　With THE INCREASE OF RELATIVE HUMIDITY, THE DISTANCE BETWEEN MOLECULES AFTER MOISTURE absorption OF fiber increases, so the hardness and brittleness of fiber decrease, and the softness of fiber dimension is greatly improved.

　　3. Relationship between relative humidity and extension length

　　After hygroscopic fiber, due to the increase of the distance between molecules, under the action of external force is easy to produce relative displacement, so the elongation length of fiber increases with the rise of relative humidity. Among them, wool, silk, viscose fibers elongate more easily than cotton, linen and other natural fibers after moisture absorption, and synthetic fibers (such as polyester) have poor moisture absorption, so the relative humidity has little effect on elongation.

　　4. Relationship between relative humidity and electricity

　　The friction between the mechanical surface and the fiber or the friction between the fiber will inevitably cause the fiber to be charged. When the fiber and the body have different charges, it will hinder the smooth progress of the stretching, combing, interweaving and winding process of the fiber. When fibers with different charge, can make the fiber are involved as well, hairiness, causing the warp between, so that weaving decollation and lace rise, make the fabric cloth cover is coarse And discrete form, improve the relative humidity of air, can lower the specific resistance of fiber, to increase the speed of charge dissipation, to eliminate static electricity.

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