Question

Wet splitting is a concept of

• A. Single end sizing
• B. Perfect drying methodology
• C. Solvent sizing
• D. Split drying

Hint:

• Wet splitting Separating sized warp yarns/sheets while the size film is still wet or partially dry.
• Aim: To reduce yarn damage and hairiness compared to splitting fully dried yarns.
• Split drying A drying method where the main warp sheet is divided into multiple sub-sheets that are dried separately or in stages. Wet splitting is often a component of this.
• Improves drying efficiency and quality of sized warp.

Answer 1

The Correct Option is D

Wet splitting is a technique used in warp sizing. After warp yarns pass through the size liquor and squeeze rollers, they form a sheet where adjacent yarns can be stuck together by the wet size film. If these yarns are fully dried while stuck together, separating them later (at lease rods before beaming) can cause abrasion, fiber damage, and increased hairiness. Wet splitting involves partially separating the sheet of sized warp yarns into smaller groups or individual sheets while the size film is still wet or only partially dried. This separation is gentler on the yarns. This technique is often integrated into split drying systems. In split drying:

• The main warp sheet coming from the size box is divided (split) into two or more smaller sheets.
• These individual sheets are then passed over separate sets of drying cylinders or through different zones of a hot air dryer.
• The initial splitting of the main sheet into sub-sheets often occurs when the yarns are still wet or semi-dry, which is the essence of wet splitting.

Benefits include more uniform drying, reduced yarn sticking, and better quality sized yarn. Evaluating options:

• (a) Single end sizing: Sizing yarns individually; wet splitting is for sheet sizing.
• (b) Perfect drying methodology: Too general. Wet splitting is a specific aspect.
• (c) Solvent sizing: Uses organic solvents. While splitting is still needed, "wet splitting" typically refers to the state of the aqueous size film. The concept could apply if a solvent-based size film is also tacky.
• (d) Split drying: This drying methodology inherently involves separating the sized warp sheet, and this separation is often done while the yarns are still wet (wet splitting) to achieve the benefits mentioned.

Therefore, wet splitting is a concept most directly and integrally associated with split drying methodologies. \[ \boxed{\text{Split drying}} \]