DFE (Directional Field Effect) in wool fiber What is DFE ? We all know that, textile fibers have to undergo various processes before they become a part of the fabric. While undergoing these processes, the fibers are subjected to friction. This frictional force can not only be effective between the fibres & various parts of […]
Textile Physics-1
Weak-link effect
In general, the effect of sample length on breaking strength has been shown that the mean measured the strength of a specimen decreases as the sample length is increased. This fact is well known as the “weak-link” effect.
Creep and Crimp of fiber
Crimp is a term to describe the waviness of a fiber. We can also describe this in terms of the force or energy required to uncrimp a fiber. It’s expressed in percentage. A crimped fiber placed on a flat plane is l0 and the length of the same fiber when the crimp is removed by applying a tension is l, then the crimp is given by …
Instantaneous and time-dependent effect
When a load is applied on a specimen constantly for a period of time, the specimen initially extends rapidly giving the instantaneous effect and then less rapidly which yields to time dependent effect.
Electron Microscope
There are two different types of electron microscopes, scanning electron microscopes (SEM) and transmission electron microscopes (TEM). In the TEM method, an electron beam passes through an extremely thin section of the specimen.
X-ray diffraction method
It is an independent method to determine the amount of crystalline matter present in the fiber. W. L. Bragg presented a simple explanation of the diffracted beams from a crystal. When X-ray beam is incident on a crystal, it strongly reflected wherever its layers of atoms at an angle show in fig. Such that, nλ=2dsinθ
Absorption of IR radiation method
Infra-red (IR) spectroscopy is one of the most common and widely used spectroscopic techniques. When electromagnetic waves interact with matter, they are scattered and absorbed. Infrared spectroscopy, radiation with wavelengths between 1 -15 μm is absorbed at certain characteristic frequencies, which yield structural information.
Crystalline and Amorphous Structure of Fiber
Amorphous region of the fiber is defined as the region of the fiber where there is no longer the order of chain molecules. The polymer chains are randomly placed in amorphous region. As a result, there is more air space in the amorphous fiber.
Study of Twist | Twist in yarn | Introduction of twist in yarn
Study of Twist in spinning | Twist in yarn | Introduction of twist in yarn Definition of twist: The term “twist” defines the helicoidal or spiral configuration organized by the rotation of a yarn or of a bundle of fibers around their longitudinal axis. Or, Twist is the measurement of spiral turns given to […]
Effect of Twist on Yarn and Fabric Properties
The twist in yarns can be caused to affect the properties of the fabric in which the yarns are included.When yarns are incorporated in a fabric such that adjacent sets of yarn vary in the direction of twist, different effects like the shade effect, stripe effect etc. can be produced because of light reflecting from two sets of yarns.