Question

Also discuss about the roughness and smoothness of fibres.​

Answer 1

Answer:

Fibres are obtained from natural sources such as cotton, wool etc. Yarn is obtained by braiding different fibres together.

Answer 2

Answer:

Definition of Smoothness-roughness Sensation

                        Physical Factors

To better understand smoothness-roughness sensation, Ekman’s research found that smoothnessroughness sensation has a power function related to the surface’s friction coefficient [18]. Later

Li also found relationship to surface roughness, compression, fiber diameter and fiber and fabric

tensile properties [8]. In the definition of Kawabata’s fabric handle properties evaluation system,

a factor named “Numeri” (Smoothness) is related to bending, surface (friction and roughness)

and compression properties [14]. Recent research by Bishop concluded that roughness is associated with friction, shear, bending stiffness, and thickness [19]. Chen represented the strength

and form of the sensation and physical properties using the regression model through 37 different materials and four physical measurements [20]. Conclusion of these studies stated that

smoothness-roughness sensation was related to surface’s friction coefficient and roughness. Fig. 2

shows a summary of these related properties.

Explanation: