GATE (TF) Textile 2013 Question Paper Solution | GATE/2013/TF/09

Question 9 (Textile Engineering & Fibre Science)

Softer cots on drafting rollers result in

(A)AN increase in drafting wave
(B)Less fibre slippage at roller nip
(C)Change in draft
(D)Reduced roller lapping
Answer / Solution
[Show Answer]

Option B

Frequently Asked Questions | FAQs

What are softer cots on drafting rollers results in?

Softer cots in drafting rollers used in carding machines can result in increased fiber drafting or separation, improved fiber alignment, and potentially higher production speeds. Cots are a type of covering material used on the rollers in carding machines, and their properties can affect the performance and output of the machine.
When drafting rollers have softer cots, which are typically made of materials such as rubber or synthetic compounds with lower durometer ratings, they can have the following effects:
Increased Fiber Drafting: Softer cots can provide more grip or traction on the fibers as they pass through the machine, resulting in increased fiber drafting or separation. This means that the fibers are more effectively pulled apart and separated, resulting in better opening and alignment of the fibers. This can be particularly beneficial when processing fibers that are tightly packed or have a high degree of entanglement, such as certain types of animal fleeces or cotton fibers.
Improved Fiber Alignment: Softer cots can also help to align the fibers more effectively as they pass through the carding machine. The softer surface of the cots can allow the fibers to be more easily pulled and aligned in a parallel fashion, resulting in a more consistent alignment of the fibers in the carded batt or roving. This can lead to improved yarn quality, with fewer irregularities and inconsistencies in the resulting yarn.
Higher Production Speeds: Softer cots may also allow for higher production speeds in the carding machine. The increased grip or traction provided by softer cots can help to hold and control the fibers more effectively, allowing for faster processing speeds without compromising the quality of the carded fiber. This can result in higher throughput and increased production efficiency in the carding process.

It’s worth noting that the choice of cot hardness or durometer is dependent on various factors, including the type of fibers being processed, the desired end product, and the specific design and configuration of the carding machine. Softer cots may not always be suitable for all fiber types or machine configurations, and other factors such as fiber length, fiber fineness, and carding machine settings also play a role in achieving optimal carding results. It’s important to consider the overall system and make appropriate adjustments to achieve the desired carding performance.

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