What is Desizing in Textile Processing

What is Desizing in Textile Processing: “Desizing” in textiles refers to the process of removing sizing material (starch). It can be done using various chemical agents

Desizing is a crucial step in textile processing that involves the removal of sizing agents applied to yarns or fabrics during the weaving manufacturing process. Sizing agents, typically starch-based, are applied to add stiffness, making them easier to handle during weaving.

In textile processing, “desizing” is a step that involves removing sizing agents applied to yarns or fabrics during the weaving manufacturing process.

Desizing is essential to ensure better chemical penetration before applying other treatments like bleaching or dying.

*What will happen if desizing is not proper?*
If desizing is not done properly, sizing agents may remain on the textile, Then there will be no penetration of chemicals and dyes.
After that uneven dyeing, reduced fabric quality, and Printing and bleaching will not be goodimpacting the overall performance and appearance of the textile.

*Which chemical can be used to check that desizing is done properly?*
iodin

Desizing process & recipe
Desizing agent 4ltr
Wetting agent 3ltr
Oxalic acid 2ltr
add chemical in 100ltr tank every 1 hour
Temperature :- 70-80°c PH:- 5 to 5.5
Speed:- 80mtr per minutes

Major Desizing Processes:

1. Enzymatic Desizing
2. Chemical Desizing
3. Mechanical Desizing

Objectives of Desizing Process:

1. Removal of Sizing Agents: Ensure complete elimination of starch or sizing materials from the fabric surface.
2. Facilitate Subsequent Treatments: Prepare the fabric for further processing such as dyeing, printing, or bleaching by allowing better penetration of chemicals.
3. Improve Fabric Quality: Enhance the fabric’s texture, hand feel, and appearance by removing stiffening agents.
4. Uniformity: Achieve consistent desizing results across the fabric to avoid uneven dyeing or printing.
5. Environmental Considerations: Minimize the environmental impact by adopting eco-friendly desizing techniques and reducing chemical usage.

Understanding Desizing:
Desizing is a fundamental process in textile manufacturing that involves the removal of sizing agents applied to yarns or fabrics during the weaving process. Sizing agents, typically starch-based, are applied to yarns or fabrics to enhance their stiffness and manageability during weaving. However, these sizing agents must be removed before further treatments like dyeing or bleaching can take place.

The Importance of Desizing:
Proper desizing is crucial for several reasons. Firstly, it ensures better penetration of chemicals during subsequent treatments such as dyeing or bleaching, leading to more uniform and vibrant colors. Without effective desizing, sizing agents may hinder the penetration of dyes and chemicals, resulting in uneven dyeing and reduced fabric quality.

Methods of Desizing:
Desizing can be achieved through various methods, including enzymatic desizing, chemical desizing, and mechanical desizing. Enzymatic desizing involves the use of enzymes to break down starch molecules, while chemical desizing utilizes chemicals to dissolve or degrade the sizing agents. Mechanical desizing relies on physical agitation to remove sizing from the fabric surface.

Checking Desizing Effectiveness:
One common method to check the effectiveness of desizing is the iodine test. Iodine solution is applied to the fabric, and if starch is still present, it will react with iodine, resulting in a color change. If desizing is successful and all starch is removed, there will be no color change in the iodine solution.

Environmental Considerations:
While desizing is essential for textile processing, it’s crucial to consider its environmental impact. Traditional desizing methods often involve the use of harsh chemicals, which can be harmful to both the environment and human health. Therefore, there is a growing emphasis on developing eco-friendly desizing techniques, such as enzymatic desizing, which utilize biodegradable enzymes and minimize chemical usage.