Is it Necessary to Sizing of Filament Yarn or Synthetic Yarn? Dynamic Explain

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Is it necessary to sizing of filament yarn??? This is most important question. In article, I will clarify this term. The main function of size is to protect the yarn during looming process. In order for this to happen, size material must possess good adhesion properties: there must be a strong force of attraction between the fiber and the size material. These forces are typically Van Der Waals’ or Hydrogen Bonding. Since hydrogen bonding is much stronger than Van Der Waals’ force, it implies that the material that forms hydrogen bonds will have good adhesion properties. When the size material does not have good adhesion properties, we can add some plasticizer to improve these properties. Additionally, these plasticizers can reduce the cost and have good film-forming properties. Now, let come to our main question.

Why is it Necessary to Sizing of Filament Yarn?

As filament yarns or synthetic yarn have a smoother surface and are stronger than staple yarns, why are they sized? There are a variety of filament yarns, ranging from high twist filament yarns to low twist multifilament yarns. Several low twist multifilament yarns can cause problems if they are not sized, including the possibility that a single filament may break during weaving. The loom will eventually stop when it produces fuzz balls, floats or skips. To avoid these kinds of situations, we sizing of filament yarn.

Figure 01:Configuration for sizing of filament yarn ( Sucker Muller Hacoba)

In figure shown, the configuration of a sizing machine for sizing of filament yarn for industrial fabrics made of carbon, aramide, polyester, glass, polyamide, etc. The unit is equipped with air pre-drying and cylinder drying.

Size Requirements for Filament Yarn or Synthetic Yarn:

size requirements for filament yarns or synthetic yarn are as follows:

  1. The size solution should penetrate sufficiently into the filament bundle using binders and additives such as emulsifiers, wetting agents, etc. The size solution should have a low enough viscosity to penetrate the filament bundle.
  2. It is important that filament and size adhere well to one another.
  3. To prevent a tacky surface, the sizing agent must dry quickly enough.
  4. Size films should have the same elasticity and flexibility as the yarns under weaving stress.
  5. Static buildup should not occur due to the size.
  6. Weaving machine parts, such as peddles, reeds, and other parts, should not be clogged with material if the size sheds excessively.
  7. During desizing, the size film properties should not be drastically affected by extreme humidity changes.
  8. There should be no negative effects on the yarn, the processing equipment, or human health from the suit. The size must be easy to process and use.
  9. The spin finish oils used by the producer should not influence the size properties.
  10. In order to avoid foaming, anti-foaming agents can be used on sizes.

Concentration of Size:

Concentration of the size, which is responsible for the number of spot welds, is determined by a combination of factors. Following factors should be consider in case of concentration of size.

  1. yarn denier- fibers with lower deniers have a greater surface area and require a larger size. number of ends/inch also consider.
  2. Type of weave— plain weaves require more effort to weave than those with long floats, such as satin.
  3. The weaving machine type and condition—
  4. In some cases, shuttle less machines are more abrasive to warp than shuttles.
  5. Type of slasher and drying arrangement employed— conventional, pre-dryer, single end beamer all have different constraints.


  1. Adanur, S. (2001). Handbook of weaving. Boca Raton: CRC press.
  2. banerjee, N. (2000). Weaving Mechanism. West Bengal: Smt. Tandra Banerjee and Sri Apurba Banerjee.
  3. Gandhi, K. (2012). Woven Textiles. New Delhi: Wood Publication Limited.
  4. Gokarneshan, D. N. (2009). Weaving Preparation Technology. Delhi: Abhishek Publicaions.

You May Read:

  1. Definitions of sizing, objectives and impact on warp yarn.
  2. Why sizing is called heart of weaving.
  3. Primary and Secondary Size Ingredients.
  4. Characteristics of Good Size Ingredients.
  5. Types and Techniques of sizing.
  6. Working Principle of Slasher Sizing Machine.
  7. Size Cooking Equipment.

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