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Irregularity
Importance of Irregularity
Types of Irregularity
Weight per unit length
Diameter
Twist
Hairiness
Colour
Trash and seed coat content
Strength
Measures of Irregularity
Range
U%
CV%
Fraction Defective
Relation between U% and CV%
Uster Evenness Tester
Principle of Operation
Precautions in Testing
Various models
Variance Length Curve
Utility
Methods of Measurement
Spectrogram
With Random distribution
With Drafting wave
With periodic irregularity
Tracing of faults in processes with spectrogram
Irregularity added in perfect fibre end drafting
Causes of Irregularity
Random fibre arrangement
Drafting Wave
Mechanical faults
Control of Irregularity
Roller Setting
Apron Spacing
Break Draft
Top Roller Pressure
Cot Hardness
Cot diameter and Width
Nose bar design
Improvements in drafting
Mechanical defects
Eccentricity in Front roller
Torsional Vibration of back roller
Defective cradle retention spring
Defective Top arm weighting
Lateral shift of apron
Bursted cots
Lateral shift of cot
Roving guide choke up
Vibrating spindle
Imperfections
Classification
Effect on yarn appearance
Control of Imperfections
Faults
Classification as per Uster
Influence of raw material
Influence of process parameters
Contribution of Cleaning and Maintenance practices
Control of Faults
Clearing of Faults
Autolevelling
Type – Open Loop and Closed Loop
Measuring systems for sliver thickness
Control Systems
Checking of effectiveness
Drafting Force
Influence of raw material
Process Factors
Online Measurement of Irregularity and Faults
Norms for U%, Imperfections and Faults
Ring Frame Productivity
Importance of Ring Frame Productivity
Ring Frame Utilisation
Mode of Estimation
From Doff Weight
From Hank Meter
Efficiency Losses
Contraction
Idle Spindle
Ends Down
Doffing
Unaccountable Causes
Maintenance
Count Change
Traveller Change
Causes of Idle Spindles
Spindle Tape Breakages
Bottom Apron breakage
Oily cots near gear end
Ends Down and End breakage rate
Roller Lapping
Side Allocation
Norms for Spindle Speed and TM
Measures to Reduce End Breakage Rate
Classification of End breakages
Traveller
Ring
Spindle
Flange Number
Lift
Angle of Wind
Wharve Diameter
Spinning Geometry
Lappet
ANBC Ring
Different types of Drives
Drafting Parameters
Ring Rail speed
Top Arm Pressure
Spindle and Lappet centring
Vibrations of Frame
Pneumafil
Humidification
Preparatory processes
Ring Data
Modern Ring Frames
Maintenance and Cleaning
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