GATE (TF) Textile 2018 Question Paper Solution | GATE/2018/TF/24

Question 24 (Textile Technology & Fibre Science)

Bottom shaft of a shuttle loom, weaving 2 up 1 down twill weave, is rotating at 90 rpm.
The speed of cam shaft (in rpm) is __60__.

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Revolution speed of bottom shaft=90 rpm

Weave type-2 up 1 down twill weave

The speed of cam or tappet shaft=?

Calculation
Formula-
The speed of cam shaft=Speed of crank shaft/3
and

The speed of bottom shaft=Speed of crank shaft/2

90=Speed of crank shaft/2

Speed of crank shaft=90*2

Speed of crank shaft=180 rpm

Now,
Speed of cam shaft=Speed of crank shaft/3

=180/3

Speed of cam shaft=60 rpm (Answer)

What is the ratio of crank shaft and bottom shaft?

The R.P.M. of crank shaft=2 x R.P.M. of bottom shaft.

What are two types of twill weave?

The two types of twill weave are:
S-Twill: In an S-twill weave, the diagonal lines of the weave pattern run from the top left to the bottom right. This type of twill weave is often used in denim fabric and is sometimes called a left-hand twill.

Z-Twill: In a Z-twill weave, the diagonal lines of the weave pattern run from the top right to the bottom left. This type of twill weave is less common than the S-twill and is sometimes called a right-hand twill. Z-twill weaves are sometimes used in suiting fabrics and other types of clothing.

The difference between the two types of twill weave is the direction of the diagonal lines in the weave pattern, which can affect the appearance and drape of the fabric.

What is a twill weave structure?

A twill weave is a type of textile weave structure characterized by diagonal ridges or lines on the face of the fabric. The twill weave structure is created by interlacing warp and weft yarns in a specific pattern.

In a twill weave, each weft yarn passes over two or more warp yarns, then under one or more warp yarns, creating a diagonal pattern on the surface of the fabric. The pattern is repeated in a regular sequence, which creates the characteristic diagonal ridges or lines. The number of warp yarns over which the weft yarn passes before going under the next set of warp yarns is called the “twill number”.
Twill weaves can be classified according to the direction of the diagonal lines, which can run from the bottom left to the top right (S-twill) or from the bottom right to the top left (Z-twill). The angle of the diagonal lines can also vary depending on the twill number and the tightness of the weave.

Twill weaves are known for their durability and ability to resist wrinkles and stains. They are used in a variety of fabrics, including denim, chino, twill suiting, and other types of clothing and home textiles.