GATE (TF) Textile 2009 Question Paper Solution | GATE/2009/TF/29

Question 29 (Textile Engineering & Fibre Science)

On drawing and heat setting, the properties of synthetic fibres change such that

(A)Modulus and strength increase, extensibility decreases
(B)Modulus decrease, strength and extensibility increase
(C)Modulus and strength decrease, extensibility remains same
(D)Modulus and strength decrease, extensibility increases
[Show Answer]

Option A is correct

Frequently Asked Questions | FAQs

What is the heat setting of synthetic fibres?

Heat setting is a process used to stabilize and shape synthetic fibers by subjecting them to heat. It involves heating the fibers to a specific temperature and then cooling them under controlled conditions to lock in their shape and dimensions. The heat setting process is typically applied to thermoplastic synthetic fibers, which have the ability to soften and flow when exposed to heat.
The heat setting temperature and duration depend on the specific type of synthetic fiber and its desired final properties. Generally, the heat setting temperature is below the fiber’s melting point to avoid complete melting or degradation. It is important to follow the manufacturer’s recommendations or specific process parameters for each type of synthetic fiber.
The heat setting process provides several benefits to synthetic fibers:

Dimensional Stability: Heat setting helps stabilize the dimensions of synthetic fibers, preventing excessive shrinkage or elongation during subsequent processing or use.
Shape Retention: By setting the fibers in a particular shape, heat setting allows the fibers to retain that shape even after exposure to mechanical stress or high temperatures.
Crease Resistance: Heat setting can enhance the resistance of synthetic fibers to creasing and wrinkling, resulting in improved fabric appearance and durability.
Improved Elastic Recovery: Heat setting can improve the elastic recovery of some synthetic fibers, allowing them to bounce back to their original shape after deformation.

The heat setting process is commonly used in the textile industry for various synthetic fibers, including polyester, nylon, acrylic, and polypropylene. It is employed in the production of fabrics, yarns, carpets, and other textile products to optimize their performance and ensure their desired characteristics.

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