Optimum Yarn Spinning conditions

Factors governing optimum spinning conditions

• Spindle speed
• Ring die
• Lift
• Traveler weight
• Relative humidity

Yarn quality assessment

• Yarn count and its variation
• Twist and its variation
• Evenness CV% or U%
• Strength and its variation(csp of yarn)
• Imperfections

Causes of end breakage/End down:

If spinning tension is greater than yarn strength in the Ring frame, then end breakage is occurred and also due to roller lapping.

A. Technical causes

• An insufficient twist in the yarn
• If traveler fly off
• Subbing thorough
• Stretched roving
• Faulty drafting roller setting
• Faulty traveler selection
• Excessive yarn tension
• Improper atmospheric condition

B. Mechanical Causes

• Faulty drafting system
• Worn out ring and traveler
• Faulty gear and wheels
• Worn out top rollers
• Faulty apron
• Spindle vibration
• Eccentric ring

Optimum spinning conditions