wpt-iv presentation final update

8/6/2019 WPT-IV Presentation Final Update

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Southeast University

Department of Textile Engineering

Welcome to our

presentation

8/10/2011 1Denim dyeing of textile


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Topic :Study on Denim Dyeing

8/10/2011 Denim dyeing of textile


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Submitted To :

Professor Dr. Zulhash Uddin

dept. of textile engineering

southeast university

Presented By:

Md. Shamsul Huda ID# 2007200400020

Akash Mahmud ID# 2007200400032

Toufiqur Rahman ID# 2007200400039



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Typical denim fabrics are woven from coarseindigo dyed cotton yarn .

They are hard weaving high density fabrics with ahigh mass per unit area.

Denim is produced more in the world than anyother type of cloth .

It is made for a variety of application and in awide range of qualities and shades.

Even today, classic denim is still dyed with indigo. It is a special process in which only the surface of

the warp yarn is dyed & the weft stays white.

This is why the garment subsequently developsthe typical and desired signs of wear.

What is Denim ?



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To produce good quality denim.

To know about the denim dyeing procedure.

To produce fashionable cloth.

To stay in the modern garments sector

Objective of Denim dyeing:



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Denim fabric required parameter(raw materials)

Minimum staple length 2.7 cm.

Yarn strength and uniformity.

Low yarn hairiness.

Micronaire value 4-4.5.

Twist factor 4.5 to5 for warp yarn & 4.2 for weft yarn.

The usual count range of denim is normally 6-16 Ne.

Proportion of short fibres



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Mostly use type of Denim Fabric in Bangladesh

Basic or regular denim.

Ring denim.

Slub denim.

Cross hatch denim.

Stretch denim. Poly denim.



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Type of Denim dyeing process :

Sleysher denim dyeing.

Indigo rope dyeing.

Indigo sheet dyeing and double sheet dyeing.

Indigo loop dyeing



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In warp preparation for rope dyeing 350-400 warpyarns are assembled on the ball warper to form a

rope 10000 to 15000 meters long. Between 12 and36 ropes are drawn through the dyeing range side byside.

After dyeing they are dried on a drum drier anddeposited in cans. The ends are spread out on a

rebeamer or long chain beamer and the yarn sheet iswound onto warp beams.

These beams then come to the sizing machinewhere they are sized dried and assembled inaccordance with the total number of ends requiresdto make up the weaving warp beam.

Indigo Rope dyeing



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Continue

This procress ensure optimal dyeing of the indigo

but with the disadvantages that broken ends aremore frequent and yarn tensions are not always

compensated .modern indigo dyeing ranges

normally operate with six dye vats.

Using state of the art method the same dyeing

quality can be achieved with just three vats with a

substantial reduction in the consumption of

chemicals.the production rate of this system is

normally 2 to 3 times higher than the sheet dyeing

system.8/10/2011 Denim dyeing of textile


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Indigo sheet dyeing and double sheet dyeing In indigo sheet dyeing warp beams are brought to the

dyeing and sizing instead of rope.

Dyeing drying sizing and after repeated drying

assembly of the warp is carried out Ina single

operation.

In the case of double sheet dyeing and sizing are done

in two separate steps. As far as indigo dyeing is concerned neither process is

always ideal but both have the advantage that the

number of broken ends is low and yarn tension can be

extremely well controlled.



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Flow chart of denim fabric procedure

m

z

m

z



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Bottoming shade(for black to indigo).

Troping shade (for indigo to black).

Black shade.

Regular shade.

Grey shade.

B.I.B (black indigo black). Brown shade.

Denim Dyeing Shade :



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V

at dye

Sulphur dye.-

Use dye in Denim dyeing



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W arping

Bleaching (Hydrogen per ox ide)

Creeling

Scouring (Sodium hydro-oxide)

W ashing (Hydrogen p er oxide, no of box 3)

Dyeing ( Indigo vat dye)

W ashing (Hydrogen p er oxide and A cetic acid, no of box 3)

Dryer (No of cylinder 12)

Sizing (Starch, modified starch, binder, wax)

Acc umu lator (Ex tra dyed yarn rolling in bea m, N o of roller 24)

Hea d Stock (final beam )

Sleysher Denim ( dyeing process):



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Ball warping

Bleaching (Hydrogen per oxide )

Creeling

Scouring(Sodium hydro-oxide)

Washing(Hydrogen per oxide, no of box 3)

Dyeing(Indigo vat dye)

Rope denim dyeing process



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Washing(Hydrogen per oxide and Acetic acid, no of box 3)

Dryer(No of cylinder 12)

LCB

Beaming

Sizing(Starch, modified starch, binder, wax)

Accumulator(Extra dyed yarn rolling in beam, No of roller 24)

Head Stock final beam

Continue



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Gradle let off

J-SCRAY Box

Brushing

Softening (cationic softener, to control PH upto 9 )

Skewing (to fixed the angle 90 degree in warp and weft)

Drying (Temp. 120-130 degree C)

Without mercharizing Finishing section



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Padder (water is used)

Sanforizing ( to control

shrinkage)

Calendaring

Loading

Continue



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With mercharizing finish

Gradle let off

J-SCRAY Box

Brushing

Mercharizing unit

Softening (cationic softener,to control PH upto 9 )

Skewing (to fixed the angle 90 degree in warp and weft)



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Drying (Temp. 120-130 degree C)

Padder (water is used)

Sanforizing ( to control shrinkage)

Calendaring

Loading

Continue



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Indigofor 1400L:

Indigo =140kg

Hydro =135kg

Setamol =7 kg

Hostapal =5 kg

Ladiquest =5kg

Sodium hydroxide =100 kg

Recipe (mother solution) :



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Continue

Sizing chemical for 700 L

Starch = 16-22 kg

Modifier = 3-5 kg

Binder = 10-15 kg

Wax = 2-3 kgWater =665



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Some Picture of Denim Dyeing process Inventory stock to Delivery

Storage Inventory8/10/2011 Denim dyeing of textile


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Warping Section8/10/2011 Denim dyeing of textile


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Beaming & dyeing8/10/2011 Denim dyeing of textile


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Beaming & dyeing8/10/2011 Denim dyeing of textile


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Weaving section8/10/2011 Denim dyeing of textile


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Finishing & Inspection8/10/2011 Denim dyeing of textile


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Delivery8/10/2011 Denim dyeing of textile


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Remark

In this experiment we learn more think about the denim dyeing process.

It is very helpful our next life to work in the denim dyeing unit

At lest thank to our respected Course teacher to give me the opportunity to

Work this type of wonderful experiment


Reference:

Understanding ofMercharizing

Sinha Denim dyeing

Ha-meam dyeing


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THANK TO

ALL8/10/2011 Denim dyeing of textile

wpt-iv presentation final update

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