Padroll and padsteam for desizing

Pad roll and Pad steam are the two processes of desizing action. Both are based on the heating of the fabric and then washing. This is useful once the fabric is passed from the desizing chamber.

Semicontinuous process-pad-roll process

In this process, the fabric is soaked with a desizing enzyme solution and stored at 60 to 70°C for at least four dips in the liquor. (As shown below figure.)

Because the feed fabric is grey, the pad liquor has a sufficient wetting agent.
The pH of the liquor is adjusted to the best activity of the enzyme being used, which is usually 6 to 7.

To further activate the enzyme, sodium chloride is added to the liquor. The fabric is then cushioned under even pressure, allowing for a near-complete absorption of the treatment fluid.

The following is a common recipe for cloth enzyme desizing.
Inside a batching chamber, the paddle fabric is batched on a roll.

The desized cloth is next unwound from the roll and chemical-free washed in an open-width soaper with hot and cold water, removing all of the starch size's soluble breakdown products.

During the washing stage, the other components of the size are also eliminated.

The recipe for this process is made with Enzyme-6-10 GPL, Sodium chloride- 5-8 GPL, and Wetting agents-0.5-1.5 GPL. While the pH of pad liquor is 6-7. The temperature of the Pad liquor is 60-70°C. Liquor uptake needs to be 100% and Storage temperature as per the RT.

Process flow for this process

Padding → Batching → Rotation → Unwound → Open width soaper → Hot & cold wash.

semicontinuous process PAD-ROLL

Continuous process-pad-steam process

The sodium bromide technique has the benefit of quick action and excellent outcomes.

The concentration of the wetting agent can be increased if the fabric contains a lot of tallow, which prevents the desizing liquor from wetting the fabric easily.

Sodium bromite's quick action allows it to be used in continuous desizing. The fabric is padded with desizing liquor according to the recipe below in this technique, which is essentially a pad stream procedure.

Enzymes have usually been utilized at low temperatures of 55 to 70 degrees Celsius.
The temperature is determined by the enzyme being employed; however, particular enzymes that are stable and active even at high temperatures are available, and these enzymes can be utilized in continuous desizing operations.

The recipe for this process is made with the Sodium Bromite- 3-5 GPL, Caustic soda- 2-3 GPL and Wetting agents-1.5-2.5 GPL as the Temperature of RT.

Process flow for this process

Padding → Steam fixation → Hot water rinsing → Cold wash.

continuous process PAD-STEAM

Sodium carbonate desizing

There is no requirement for enzyme treatment when P/C mixes contain only water-soluble sizes.

In such a scenario we have to simply treat the fabric with a moderate alkali such as sodium carbonate and detergent Size chemicals like water-soluble cellulose ether and modified starches like dextrin are effectively removed by the sodium carbonate treatment; additional size chemicals like polyvinyl alcohol (PVA) are also promptly removed due to their water solubility.

The following is a common sodium carbonate desizing recipe.

The recipe for this process is made with Sodium carbonate-4-5 GPL, Detergent - 1-1.5 GPL with Desizing temperature of 70-80°C for 1 hour time.

Process flow for this process

Treatment with given Solution for 1 hour → Hot & cold wash.

Sodium Bromite desizing (semicontinuous process)

Polyester cotton blends containing starch and water-soluble size can also be desized using sodium bromite, an oxidizing agent, to rapidly oxidize starch into products that are soluble in caustic alkali pad liquid (recipe below).

Padding is done on the fabric with a conventional padding machine and a low liquor pad bowl.

The padding material is then left to oxidize for 10 to 20 minutes before being treated with 5-6 GPL caustic soda at a boil in an open soper machine, followed by a hot and cold wash.

The recipe for this process is made with Sodium Bromite of 1.5-2GPL, Sodium carbonate - 5-6GPL and Wetting agents - 1.5-2GPL at Room temperature.

Process flow for this process
Padding with the given → solution → Oxidation → Open soaper (alkali (treatment) → Hot & cold wash.

Questions -

What is the padroll system for desizing processing?
What is the padsteam system for the desizng processing?
Describe Sodium carbonate desizing.
Describe Sodium Bromite desizing.

References

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