Question 26 (Textile Technology & Fibre Science)
The cross-sectional shape of a fibre affects the following properties of yarn
P. Lustre
Q. Torsional rigidity
R. Flexural rigidity
S. Packing density
| (A) | P & Q only |
| (B) | P & R only |
| (C) | P, Q & R only |
| (D) | P, Q, R & S |
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Frequently Asked Questions | FAQs
What is the meaning of lusture?
Lusture refers to the shiny or reflective quality of a surface, especially a smooth and polished one. Luster can be described as the amount of light reflected by a surface of yarn, and it is often used to describe the appearance of metals, ceramics, and other materials that have a shiny finish.
What is torsional rigidity of a beam?
Torsional rigidity refers to the ability of a fabric to resist twisting or torque when subjected to mechanical stress. It is a measure of the stiffness of the fabric in the direction perpendicular to its plane.
Torsional rigidity is an important property for fabrics used in applications where they will be subject to mechanical stress, such as in the manufacture of technical textiles or in the construction of fabric-reinforced composites. A fabric with high torsional rigidity will be able to maintain its shape and structural integrity under mechanical stress, while a fabric with low torsional rigidity may deform or collapse under the same conditions.
Torsional rigidity is affected by several factors, including the type of fiber used in the fabric, the fabric structure, and the yarn twist. Fabrics made from high-strength fibers such as aramids or carbon fibers generally have higher torsional rigidity than fabrics made from lower-strength fibers such as cotton or polyester. The weave or knit structure of the fabric can also affect its torsional rigidity, with tighter weaves or knits generally providing higher rigidity. Finally, the twist level of the yarn used to make the fabric can affect its torsional rigidity, with higher twist levels generally providing higher rigidity.
What is flexural regidity also known as?
In textile engineering, flexural rigidity refers to a fabric’s ability to resist bending or folding when subjected to mechanical stress. It is a measure of the stiffness of the fabric in the direction perpendicular to its plane.
Flexural rigidity is an important property for fabrics used in applications where they will be subject to mechanical stress, such as in the manufacture of technical textiles or in the construction of fabric-reinforced composites. A fabric with high flexural rigidity will be able to maintain its shape and structural integrity under mechanical stress, while a fabric with low flexural rigidity may deform or fold under the same conditions.
Flexural rigidity is affected by several factors, including the type of fiber used in the fabric, the fabric structure, and the yarn twist. Fabrics made from high-strength fibers such as aramids or carbon fibers generally have higher flexural rigidity than fabrics made from lower-strength fibers such as cotton or polyester. The weave or knit structure of the fabric can also affect its flexural rigidity, with tighter weaves or knits generally providing higher rigidity. Finally, the yarn twist level can also affect a fabric’s flexural rigidity, with higher twist levels generally providing higher rigidity.
How do you calculate packing density?
In textile engineering, packing density refers to the amount of fibers that can be packed into a given area of a fabric. It is a measure of the tightness of the weave or knit of the fabric and is usually expressed as the number of fibers per unit area.
Packing density is an important property for fabrics used in various applications, such as filtration, protective clothing, and composite materials. A higher packing density generally means that the fabric will have better mechanical properties, such as higher strength, stiffness, and abrasion resistance.
Packing density is affected by several factors, including the fiber diameter, the fiber shape, the yarn count, and the weave or knit structure of the fabric. Fabrics made from fibers with a smaller diameter, such as microfibers, can achieve a higher packing density than fabrics made from larger fibers. Similarly, fabrics made from fibers with a more regular shape, such as monofilament fibers, can achieve a higher packing density than fabrics made from irregularly shaped fibers.
The yarn count also plays a role in packing density, with higher yarn counts generally leading to higher packing densities. Finally, the weave or knit structure of the fabric can also affect its packing density, with tighter weaves or knits generally providing higher packing densities.
It is calculated by-
1)Hexagonal close packing
2)Open packing