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Monday, 17 May 2021

Process Control in Jigger Dyeing Machine

 


Parameter

Check point

Method of Checking

Standard/ Frequency of check

Necessary Action(s)

Fabric preparation

Prior to dyeing

pH of the cloth

Uniform whiteness

Absorbency

Selvedge crease/

Body creases

Near Neutral

Uniform whiteness

Good Absorbency

No creases/

Each bleach lot

Ensure good fabric preparation

Batching

During Batching

Visual

 

Random check

Knife edge batching

Ensure no slippage

Proper working of expander

Uniform tension at the time batching

Batch Size

During batching

Measurement of yardage

Maximum permissible load

Random check

Ensure that jigger is not overloaded

MLR

Prior/During Dyeing

Check for water level

Check for weight of fabric load

Once a shift

Maintain constant MLR

Prevent water leakages

Selection of end cloth

Prior to dyeing

Length and colour of end cloth

Compatible with the shade

Random check

Ensure proper selection and length of end cloth

Crease-free working of jiggers

During dyeing

Visual

During each round

Adjust alignment expanders

Adjust roller alignment

Remove crease manually, if possible

Recipe

Prior dyeing

 

 

Scrutinizing of chemical slip should compatible with shade

Once a day

Take corrective measure

Colour Preparation

During Colour preparation

Visual/Spotting on filter paper

Random check

Ensure proper dissolution of dye

Strain of the dye

Investigation method of dissolution

Ensure proper vatting of vat dye

Colour/Chemical Addition

During Dyeing

Visual

 

Vat yellow/ Congo red Paper

 

Phenolphthalein paper

Random  check

Carry out colour addition in equal parts

Effect proper stirring of colour

Predissolve all solid chemicals and add

Concentration of chemicals

During dyeing

Titration

During round

Ensure proper concentration

Temperature

During dyeing

Thermometer

Thermocouple

Thermistor

All of the above

During each round

Regulate steam supply

Carry out heating at the end of turn

Prefer thermocouple

pH

During dyeing

pH paper

Direct – 10.4

Reactive – 11.2

Vat – 11.4

As per the class of dyestuffs

Take corrective measure

Give adequate time/ number of ends

Time

During dyeing

Time record, number of ends

As per the class of dyestuffs

Take corrective measure

Give adequate time/ number of ends

Correction of shade

During process

Visual

Whenever Possible

Maintain the MLR

Add extra colour

After treatment

After dyeing

Laboratory analysis

As per class of dyes

Direct – dye fixing treatment

Azoic – thorough soaping with dispersing agent

Reactive – (NID) soaping for preventing the tinting

Disperse – reduction clearing treatment

Redyeing

During Process

Production record

Minimum redyeing

Investigate the reason of for redyeing

 

Reference: Orientation Programme in Wet Processing (Quality and Process Control) organised by BTRA, Mumbai


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