GATE (TF) Textile 2014 Question Paper Solution | GATE/2014/TF/10

Question 10 (Textile Engineering & Fibre Science)

In drawframe with 3 over 3 drafting system, the roller most prone to slip is

(A)Middle top roller
(B)Front top roller
(C)Back top roller
(D)Front bottom roller
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What is the function of draw frame? | What is the process of draw frame?

The draw frame is a critical machine used in the textile spinning process, which is used to further process the carded sliver or roving from the carding machine before it is spun into yarn. The main function of the draw frame is to perform several important tasks that are crucial to producing high-quality yarn with consistent properties. The main functions of a draw frame include:
Drafting: The draw frame performs the process of drafting, which involves elongating and thinning the carded sliver or roving by passing it through a set of drafting rollers or aprons. The drafting process is essential for improving the alignment of fibers, reducing the sliver or roving thickness, and increasing its uniformity. This process helps to improve the strength, evenness, and quality of the yarn produced.
Doubling: The draw frame allows for doubling, which involves combining two or more carded slivers or rovings together to form a thicker sliver or roving. Doubling helps to increase the mass per unit length of the fiber strand and can be used to achieve specific yarn characteristics or to blend different fiber types.
Tension Control: The draw frame applies controlled tension to the sliver or roving during the drafting process, which helps to maintain consistent fiber alignment and prevent fiber breakage. Tension control is critical to producing yarn with consistent properties and to prevent damage to the fibers.
Monitoring and Control: The draw frame typically includes monitoring and control features, such as sensors, gauges, and settings for controlling the drafting process, such as roller settings, draft ratios, and speeds. These features allow for precise control of the drafting process, enabling the operator to adjust and optimize the draw frame settings to achieve the desired yarn characteristics.
Packaging: The draw frame may also include mechanisms for winding the processed sliver or roving onto bobbins or packages, which are ready for further processing, such as spinning into yarn or plying.
Overall, the draw frame is a critical machine in the textile spinning process that performs drafting, doubling, tension control, monitoring, and packaging functions to process the carded sliver or roving into high-quality yarn with consistent properties.

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