Multifilament Yarn Optimum Sizing Add-on

Sizing is a crucial preparatory process for yarns, especially multifilament yarns, before weaving. It involves applying a protective coating (size) to the yarn surface to improve its strength, reduce friction, and prevent breakage during the high-speed stresses of weaving.

Optimal Size Add-on Percentage

The amount of size applied, known as the add-on percentage, must be carefully controlled. For multifilament yarns, the generally accepted optimum range for size add-on is:

• 4\% to 8\%

Reasoning for the Range

This specific range ensures:

• Sufficient protection against abrasion and breakage during weaving.
• Minimal impairment of the yarn's flexibility and handle.
• Good adhesion of the size to the filament surface without excessive stiffness.

Add-on levels below this range may not provide adequate protection, while levels significantly above it can make the yarn brittle, increase hairiness, and negatively affect the final fabric properties.