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Continuous desizing process (Winch and J-box)

Continuous Desizing

Desizing can be completed with two machines which are Winch and J- Box. These are the two common machines/arrangements that will also be vital for other chemical processing of fabric.

Continuous Desizing using a winch machine

In a continuous desizing procedure, the grey fabric is first passed through hot water, then through a 0.5 to 2% solution of malt extract held at 50 to 60°C and a PH of 6 to 7.5.

Using hot water to pre-impregnate the cloth stops the malt extract solution from cooling down.
Desizing can take as little as 5 minutes when harsher solutions are applied.

The cloth that has been impregnated with a higher concentration of enzyme solution is turned into rope and allowed to fall into a winch with a smooth sloping bottom. 

The fabric takes on a wavy shape and slides down the winch floor's slope.
It takes roughly 5 minutes for the cloth to travel from where it was deposited in the winch t
o where it is picked up for washing in the rope washing machine.

Recipe - Malt extract - 0.5 to 2 %, Temperature - 50 to 60°C and pH - 6 to 7.5.

Continuous desizing using a winch machine
Continuous desizing using a winch machine

Continuous Desizing using J-Box

Polyester cotton blend fabrics are suggested for this technique.
The material is padded with enzyme solution and fed through an open-width j box kept at 80 to 90°C in a continuous Desizing technique. 

The fabric is fast enough to achieve a dwell time of 25 to 40 minutes.

The cloth is next washed in an open soper with hot and cold water, as illustrated in the diagram.
The continuous j-box approach produces more, but it necessitates the purchase of expensive equipment.

Recipe - Enzyme - 1 to 2%, Temperature - 80 to 90°C, Time - 25 to 40 minutes.

continuous Desizing using J-Box
continuous Desizing using J-Box

Advantages -

1. The desizing process is really fast, i.e. it takes only a few seconds.
2. Because the process is continuous, uniform desizing is achieved, and production efficiency is good.
3. There is no chance that the cellulose will be tendered during the procedure.
4. Fabric with a tight weave or a strong weave can be efficiently desized.

Disadvantage -

The disadvantage of enzymes is that if the proper temperature and pH conditions are not maintained, the enzyme's desizing action is inhibited. 
On the other hand, the enzyme's desizing efficiency may be compromised. 

Questions  -

  1. What is continuous desizing?
  2. What is the winch desiing process?
  3. What is the J-box desizing process?
  4. Describe the advantages and disadvantages of the winch machine.
  5. Describe the advantages and disadvantages of the J-box machine.


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Further reading,

 - Rushikesh Patil (Textile Engineer)
(DKTE Society textile engineering college Ichalkaranji)

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