GATE (TF) Textile 2021 Question Paper Solution | GATE/2021/TF/08

Locknit, also known as interlock knitting, is a type of weft knitting where two separate sets of needles are used to create two interlocking layers of knit fabric. The resulting fabric has a double-layered, reversible structure, and is typically thicker and more stable than other types of weft-knitted fabrics.
In Locknit knitting, each needle set alternates in a 1×1 rib formation, with the needle on one bed knitting the front layer and the needle on the other bed knitting the back layer. The knitting machines used for Locknit knitting typically have two needle beds that are positioned opposite each other and can be controlled separately.
The interlocking structure of Locknit fabric makes it highly resistant to curling and stretching, and gives it a smooth and uniform appearance on both sides. Locknit fabrics are often used for applications where durability and stability are important, such as in outerwear, upholstery, and industrial fabrics.
One potential drawback of Locknit knitting is that it requires a larger number of needles and a more complex machine setup than other types of weft knitting, which can make it more expensive and time-consuming to produce.

Double tricot is a type of weft knitting that produces a thick, stable, and non-stretch fabric that is similar in appearance to a woven fabric. It is a variation of the tricot knitting technique, which uses a single needle bar to create fine, sheer fabrics with a distinctive diagonal stitch pattern.
In double tricot knitting, two separate needle bars are used to create a double-layered fabric that is more stable and less prone to stretching than single-layer tricot fabrics. The two layers are interlocked and knit simultaneously, creating a fabric with a smooth and uniform appearance on both sides.
Double tricot fabrics can be produced in a wide range of weights and densities, and are commonly used in applications where durability and stability are important, such as in upholstery, automotive textiles, and industrial fabrics. They are also used in the production of technical fabrics, such as geotextiles and filtration media.
One potential drawback of double tricot knitting is that it requires a more complex machine setup and a larger number of needles than other types of weft knitting, which can make it more expensive and time-consuming to produce. However, the resulting fabrics are highly versatile and can be customized to meet a wide range of performance requirements.

1×1 rib is a common type of weft knitting that produces a stretchy, reversible fabric with a distinctive vertical column pattern. It is created by alternating knit and purl stitches in a 1×1 pattern, where one stitch is knit and the next stitch is purled.
In 1×1 rib knitting, each stitch is worked twice, once on the front side and once on the back side, creating a double-layered fabric that is highly stretchy and elastic. The knit and purl stitches create raised and recessed columns that run vertically down the length of the fabric, giving it a textured appearance.
1×1 rib fabrics are commonly used for applications where stretch and recovery are important, such as in waistbands, cuffs, and collars on clothing. They can also be used for more decorative purposes, such as in scarves or other accessories.
One potential drawback of 1×1 rib knitting is that it can be somewhat time-consuming and labor-intensive to produce, especially when working with fine yarns or small needles. However, the resulting fabric is highly versatile and can be customized to meet a wide range of performance requirements.

Reverse locknit is a type of weft knitting that produces a fabric with a double-layered, reversible structure that is similar in appearance to a double knit fabric. It is created by using two sets of latch needles that are arranged in a “sandwich” formation, with one set of needles above the fabric and one set below.

In reverse locknit knitting, the two sets of needles work together to create a fabric with two separate layers that are interlocked at each needle position. The resulting fabric is reversible and has a smooth, uniform appearance on both sides, with a characteristic diagonal stitch pattern that is similar to single knit fabrics.

Reverse locknit fabrics are typically thicker and more stable than other types of weft-knitted fabrics, and are commonly used for applications where warmth, durability, and stretch recovery are important, such as in athletic wear, outerwear, and upholstery.
One potential drawback of reverse locknit knitting is that it can be more time-consuming and labor-intensive to produce than other types of weft knitting, especially when working with fine yarns or small needles. However, the resulting fabric is highly versatile and can be customized to meet a wide range of performance requirements.