GATE (TF) Textile 2016 Question Paper Solution | GATE/2016/TF/41

Question 41 (Textile Engineering & Fibre Science)

In needle punching process, higher punch density CAN NOT cause

(A)Lower web thickness
(B)Higher change of fabric dimensions
(C)Higher damage of fibres
(D)Higher permeability of fabric
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Frequently Asked Questions | FAQs

What is needle punched fabric?

Needle punched fabric is a type of nonwoven fabric that is made by mechanically interlocking fibers together using a barbed needle. The process involves layering loose fibers, such as polyester or wool, onto a conveyor belt or other surface and then repeatedly puncturing them with a needle. This causes the fibers to entangle and interlock, creating a durable and flexible fabric with a variety of textures and thicknesses.
Needle punched fabrics are often used for applications that require strength, durability, and resistance to abrasion and tearing. They are commonly used in industries such as automotive, construction, filtration, and geotextiles, as well as for home furnishings, such as carpets and rugs, and for crafts and DIY projects. Needle punched fabrics can be made in a variety of colors and patterns, and they can be treated with additional coatings or finishes to enhance their properties or appearance.

What factors effect the properties of needlepunched nonwoven fabrics?

The properties of needle punched nonwoven fabric can be influenced by several factors, including:

Fiber type and properties: The type of fiber used in needle punching affects the properties of the resulting fabric. For example, natural fibers like wool or cotton have different properties than synthetic fibers like polyester or nylon.

Fiber blend: A blend of different fibers can be used to create a nonwoven fabric with specific properties. For example, a blend of polyester and nylon fibers can create a fabric that is both strong and lightweight.

Fiber orientation: The orientation of the fibers in the nonwoven fabric can affect its properties. For example, fibers oriented in one direction can create a fabric that is strong in that direction.

Needle density and size: The number and size of the needles used in the needle punching process can affect the thickness, strength, and density of the resulting fabric.

Punching speed and force: The speed and force at which the needles punch the fibers can affect the entanglement of the fibers and, consequently, the properties of the fabric.

Heat treatment: Heat treatment can be used to enhance the properties of the fabric, such as increasing its stiffness or making it more resistant to water.

Overall, these factors can be adjusted to create a wide range of needle punched nonwoven fabrics with different properties, such as strength, flexibility, thickness, and texture.

Which properties are dependent on fabric thickness?

The thickness of needle punched nonwoven fabric can have an impact on several of its properties. Some of the properties that are dependent on fabric thickness include:

Absorbency: Thicker fabrics tend to be more absorbent than thinner ones, as they have more surface area to capture and hold liquids.

Thermal insulation: Thicker fabrics tend to provide better insulation against heat or cold, as they can trap more air within their fibers.

Stiffness: Thicker fabrics tend to be stiffer than thinner ones, as the additional layers of fibers can provide more structural support.

Pore size: Thicker fabrics tend to have larger pore sizes, which can affect their filtration properties or ability to block light.

Strength: Thicker fabrics can be stronger than thinner ones, as they have more layers of fibers that can interlock and provide more resistance to tearing or puncturing.
In general, thicker needle punched nonwoven fabrics tend to be more durable and provide better insulation, while thinner fabrics tend to be more flexible and have better drape. The optimal thickness for a particular application will depend on the specific requirements for that application, such as the level of absorbency or insulation needed.

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