The types of sack sewing threads vary according to material composition and durability, and the most commonly used types include:

• Cotton Thread Typically used for sewing paper and fabric sacks, it is soft, easy to work with, and allows smooth needle movement. It is preferred in applications requiring flexible and lightweight stitching.
• Polyester Thread The most widely used for sewing plastic and polypropylene sacks. It features high tensile strength and excellent resistance to tearing and moisture, making it ideal for intensive industrial use.
• Silk Thread Recognized for its smooth texture and shiny appearance. It is often used in special applications, premium sacks, or decorative packaging where appearance is important. It also provides good flexibility and bonding strength.
• Blended Thread A combination of two or more materials such as cotton and polyester, offering a balance between strength, softness, and cost efficiency. It is suitable for multiple uses and can be applied to various types of sacks.