textile physics - swelling of yarn
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Welcome to My PresentationTOPIC: SWELLING OF YARN
Md. Saeid AhmedID: 142/23/3984
Swelling Property
When the fibers absorb water, they change dimensionally (length, diameter, area). Swelling occurs in transverse direction (width wise) and axial direction (length wise). It can be expressed in terms of increase in diameter, length, area and volumes. That means the dimensionally changes due to absorbing water or moisture by any fiber is termed as swelling property.
Types of swelling
1. Transverse dial swelling 2. Transverse area swelling 3. Axial swelling 4. Volume swelling
1. Transverse dial swelling: Fractional increase in diameter of a fiber after swelling is called transverse dia swelling. Mathematically,Transverse dia swelling, SD = ∆D / DWhere, D = original diameter of fiber, ∆D =increased diameter of swollen fiber.
2. Transverse area swelling: Fractional increase in area of a fiber after swelling is called transverse area swelling.Mathematically,Transverse area swelling, SA = ∆A / AWhere, A = original area of fiber, ∆A =increased area of swollen fiber.
3. Axial swelling: Fractional increase in length of a fiber after swelling is called axial swelling.Mathematically, Axial swelling, SL = ∆L / LWhere, A = original length of fiber, ∆L =increased length of swollen fiber.
4. Volume swelling: Fractional increase in volume of a fiber after swelling is called volume swelling.Mathematically,Volume swelling, SV = ∆V / VWhere, V = original Volume of fiber, ∆V =increased volume of swollen fiber.
Importance of Swelling
Improve the absorption capability of dyes and chemicals. It has technical consequences in the dimensional stability of the
fabric, the predominant transverse swelling measurement. Due to swelling the pores of interlaced structure will be blocked,
this idea is used to produced shower proof fabric. Improve fastness of dyed materials. Elastic properties changed. Static Electricity is reduced.
Rates of swelling Depends on
Size and form of the sample, such as - fiber, yarn, fabric etc. Composition of the material, such as - cotton, polyester, acrylic, nylon
etc. External condition, i.e. Temperature. Chemical content, i.e. oil, wax and other impurities.
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