GATE (TF) Textile 2012 Question Paper Solution | GATE/2012/TF/05

Question 05 (Textile Engineering & Fibre Science)

Drawing of synthetic filament does not lead to an increase in

(C)Tensile modulus
(D)Elongation at break
Answer / Solution
[Show Answer]

Option D

Frequently Asked Questions | FAQs

What is drawing process of filament?

Drawing is a process used in the manufacturing of filament yarns, which involves stretching and orienting the polymer molecules in the fibers to increase their strength, durability, and other desirable properties. The process of drawing typically involves the following steps:

Extrusion: The polymer is melted and extruded through a spinneret to form continuous filaments.

Cooling: The filaments are cooled to solidify them.

Pre-drawing: The filaments are then passed through a set of rollers, which pull them at a slower speed to orient the molecules slightly in the direction of the fiber.

Drawing: The filaments are then passed through a set of heated rollers, which rapidly pull them at a higher speed to align the polymer molecules in the direction of the fiber. This results in a significant increase in strength, as well as other properties like tenacity, elongation, and stiffness.

Annealing: The filaments are then cooled slowly in a process called annealing, which helps to set the molecular orientation and further increase the strength and durability of the yarn.

The degree of drawing can be controlled by adjusting the speed and temperature of the rollers, as well as the amount of pre-drawing that is done. Drawing can be done once (single drawing) or multiple times (double or triple drawing) to achieve different levels of strength and properties.

Drawing is a critical step in the production of filament yarns, as it significantly affects the performance and characteristics of the final product. The process of drawing can vary depending on the specific material and application of the yarn.

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