Training of Supervisors and quality control personnel in a Textile mill is an activity often given least importance by mill management. Many of the technical problems like poor quality, low productivity, waste losses, under utilisation of testing and online quality monitoring facilities arise from lack of proper training. To make good this drawback, training courses have been drawn up based on years of R&D and Consultancy experience. Yarn Irregulaity and ring frame productivity are two important aspects affecting sale value, cost of production and profitability of a mill. The topics that will be covered during training course on these subjects are indicated below. The training will be done at mill premises.
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
1. From Doff Weight
2. From Hank Meter
Causes of Idle Spindles
1. Spindle Tape Breakages
2. Bottom Apron breakage
3. 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
1. Classification of End breakages
2. Traveller
3. Ring
4. Spindle
5. Flange Number
6. Lift
7. Angle of Wind
8. Wharve Diameter
9. Spinning Geometry
10. Lappet
11. ANBC Ring
12. Different types of Drives
13. Drafting Parameters
14. Ring Rail speed
15. Top Arm Pressure
16. Spindle and Lappet centring
17. Vibrations of Frame
18. Pneumafil
19. Humidification
20. Preparatory processes
