Question

Tinting is done in one of the following cases

• A. Mixing of Jayadhar and Virnar Cottons to a lot size of 2000 kg
• B. Mixing of Polyester and Viscose to a lot size of 2000 kg
• C. Mixing of Sivin and Varalakshmi Cottons to a lot size of 2000 kg
• D. Mixing of LK-33 and DCH-32 Cottons to a lot size of 2000 kg

Hint:

Tinting always refers to controlled cotton-to-cotton blending of compatible varieties in bale management systems. It is used to maintain uniform yarn quality in spinning mills.

Answer 1

The Correct Option is D

Concept: Tinting in cotton processing refers to the controlled blending of different cotton varieties to achieve uniformity in fibre characteristics such as length, strength, fineness, and maturity. It is mainly applied in bale management systems where different lots of cotton are combined to maintain consistent yarn quality. The key idea is that tinting is done only between compatible cotton varieties having similar fibre properties. It is not used for blending different fibre classes like cotton with polyester or viscose.

Step 1: Understand the meaning of tinting.
Tinting means controlled mixing of cotton varieties to maintain uniform fibre quality and consistency in spinning performance. \[ \text{Tinting} \Rightarrow \text{Cotton to Cotton blending only} \]

Step 2: Eliminate incorrect fibre combinations.
Option (B): Polyester and Viscose
This is a synthetic fibre blend and not related to cotton tinting. \[ \boxed{\text{Incorrect}} \] Option (A): Jayadhar and Virnar cottons
These may be cotton varieties, but they are not typically standard compatible blending pairs used in bale tinting systems. \[ \boxed{\text{Less appropriate}} \] Option (C): Sivin and Varalakshmi cottons
These are also cotton varieties, but not commonly used as a controlled tinting pair in industrial bale mixing practice. \[ \boxed{\text{Less appropriate}} \]

Step 3: Identify correct industrial blending pair.
LK-32 and DCH-32 cottons are well-known compatible cotton varieties used in controlled blending systems to maintain consistent spinning quality in mills. They are suitable for large-scale bale mixing (around 2000 kg lot size). \[ \boxed{\text{Compatible cotton blending pair}} \]

Step 4: Write final conclusion.
Thus, tinting is correctly done in the case of: \[ \boxed{\text{Mixing of LK-33 and DCH-32 cottons}} \] Therefore, \[ \boxed{\text{Option (D) is the correct answer.}} \]