PAD STEAM DYEING MACHINE

Welcome To Our Presentation

PREPARED BY

MD. Mazadul Islam Ripon ID: 2013000400016MD. Shaiful Islam Jony ID: 2013000400031Batch: 22 Section: WPT

Southeast University Department of Textile Engineering

Pad Steam Dyeing

A process of continuous dyeing in which the fabric in open width is padded with dyestuff and is then steamed.

It’s an ideal machine for reactive dyeing. Light, pale and medium shades can be dyed in this machine. Continuous roller steamer is used for diffusion of reactive, vat, sulphur and direct

dyes into cellulosic fibers in an atmosphere of heat and moisture that is created by saturated steam injected into the steamer.

Fig: Pad Steam dyeing machine

Purposes of the machine

It can be used as a pad batch for reactive dyeing in which batch is left for 12-18 hours for the completion of the reaction. For time saving the fabric passes through the steamer for 1 minute and the reaction is completed.

It can also be used for reduction clearance (RC) in which we treat PC fabric with caustic and sodium hydrosulphide to remove the disperse dye from cotton.

Stripping of the fabric can also be done on this machine that is, color can be removed completely by adding higher amount of caustic and sodium hydrosulphide.

It can be used for the development of Vat dyes.

The dyed fabric can be washed in this machine.

Process that can be done on his machine

Main Sections of the Machine

Reactive dyeing Pad-batch dyeing Reduction Dyeing Stripping Vat Development/ Vat Dyeing Hot and Cold Washing Pad Steam Wet Chemical Pad

Inlet Section Padding Section Steamer Washer Dryers Batcher

Inlet Section

Inlet section consist of following parts:Plaiter/batcherTensioner rollersFree guide rollerStationary rollers

Padding Section

Padders use for padding. The pressure of the padders are 1.5 - 2 bar. Two types of pressure used in Kuster padders, hydraulic and pneumatic. The central pressure is hydraulic and side pressure is pneumatic. We can adjust the pressure of the padders, to prevent the listing problem. Liquor is picked in the fabric; afterwards the excessive liquor is squeezed out by means

of padders at predetermined pick-up% set by applying pressure on the padders.

Fig: Padding section

Steamer

In pad steam machine after chemical padding fabric goes through steamer for fixing.

Its consists of two chamber. This chamber is steam heated & temperature is around 100- 105 ‘C. Here fabrics go over few rollers. The length of steamer is 90 meter & fabric is remain here for 1.5

min (approximate).

Fig: Steamer section

Washer

Washing is carried out in order to remove unfixed dyes. After steamer fabric flows from 7 to 8 washers. Most commonly first to four washers are used for washing of salt or

chemicals which are being applied in trough of pad steamer. In 5th, 6th washer, oxidation is done if required. If oxidation is not required then soaping is done in 5th, 6th washers. Neutralization is done in 7th washer by using acetic acid There are 8 chambers counter flow system is used.

Fig: Washing & Neutralization section

Dryers

In the last of the pad steam machine, there are three groups of drying cylinder for dry the fabric. Each group has 12 hot cylinders, but last one has 10 hot and 2 cool

cylinders. All the cylinders are Teflon coated. Their purpose is to remove water molecules from fabric.

Fig: Dryers section

Batcher

The fabric from drying cylinders passes through some tension rolls and also from anti-static rods which absorbs the charge from the fabric.

This rod has 5 KV voltages and 1800-18000A of current after passing through this fabric is winded on the batcher.

Fig: Batching Section

Conclusion

The pad steam dyeing machine can easily dye any textile material with a high speed.

Its speed can vary between 50 to 250 meters per minute. According to Industry estimates pad steam dyeing is a popular

dyeing method and 60% textile materials are dyed.

Thank You