Why Sizing is Called the Heart of Weaving? Easy 10 Reasons

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As a critical part of fabric production, sizing is rightfully referred to as the “heart of weaving.” Warp yarns are the foundation of any woven fabric, and sizing prepares and strengthens them just as the heart sustains life. During weaving, sizing prevents excessive breakage and tangling by adding a protective layer and reducing friction. By improving weave ability, the weaving process is more efficient, the fabric structure is consistent, and defects are minimized. As well as sizing agents, yarn properties can be controlled, such as moisture absorption control or dye receptivity, further influencing fabric properties. By sizing efficiently, the loom operates smoothly and with fewer stoppages, reducing waste and improving productivity. Weaving depends on well-sized warp yarns, so sizing is a crucial step to ensuring fabric integrity and bringing the weaver’s artistic vision to life.

I will explain why sizing is called the heart of weaving in this article. Please read the full article and understand the technical reasons behind title of “heart of weaving”.

Figure 01: Heart of weaving (sizing machine)

You May Read: Definitions of sizing, objectives and impact on warp yarn

Why Sizing is Called the Heart of Weaving?

Because sizing significantly impacts and enhances various essential properties of the yarn used in weaving, it is appropriately referred to as the “heart of weaving.” These properties all play a major role in determining the fabric’s quality and performance. Here are some reasons why sizing gets its name:

  1. Higher Strength:  A sizing adds an additional layer of strength and protection to the warp yarns, allowing them to resist breakage during weaving and resulting in a more durable fabric.
  2. Higher Elasticity: While sizing may slightly reduce the yarn’s elasticity, it maintains dimensional stability and prevents excessive yarn lengthening during weaving.
  3. Higher Smoothness: It reduces the roughness and hairiness of yarn, resulting in smoother, neater threads, which improves the fabric’s surface appearance and prevents it from pilling.
  4. Higher Yarn Diameter and Weight: Due to the presence of sizing agents, sizing can increase yarn diameter, resulting in thicker and heavier yarns. This can provide a more substantial and robust fabric for certain applications.
  5. Lower Static Electricity: During weaving, sizing agents can minimize yarn tangling and dust accumulation by reducing static electricity generation.
  6. Lower Weakness: The size strengthens the yarns, reducing the possibility of breaks during weaving as a result of weaknesses or flaws.
  7. Lower Absorbency: By forming a protective layer over the yarn, sizing can decrease the yarn’s absorbency, which is beneficial for fabrics that must resist moisture.
  8. Lower Flexibility: Sizing may slightly reduce yarn flexibility, but it ensures better control during weaving, improving fabric structure and efficiency.
  9. Lower Hairiness: The sizing process reduces yarn hairiness, resulting in fewer defects in the final fabric and cleaner shed openings during weaving.
  10. Higher Frictional Resistance: Warp yarns move more smoothly during weaving when sized, reducing friction between them.

A fabric’s strength, durability, appearance, and overall performance are directly influenced by sizing, which plays a crucial role in weaving, as it enhances yarn properties. By optimizing these essential characteristics, sizing empowers weavers to create fabrics of exceptional quality, making it rightfully deserving of its title “heart of weaving.” The above all properties of the yarn can be obtained by sizing in weaving section. This is why sizing is called the heart of weaving.


  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. Belal, P. D. (2016). Understanding Textiles for a Merchandiser. Dhaka: LB Graphics & Printing.
  4. Hossain, M. S. (2014). Introduction to Textile Engineering. Dhaka: Books Fair Publications.
  5. Rahman, M. M. (2008). Fabric Manufacturing Technology. Dhaka: Books Fair Publications.
  6. V. Gordeev, P. V. (1982). Cotton Weaving. Russia: Mir Publishers Moscow.

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