Characteristics of flat yarn dryer fabric

Flat yarn dryer fabric, also known as flat wire dryer fabric, is a type of woven mesh used in papermaking machines to dry paper as it passes through the drying section of the paper machine. It plays a crucial role in the paper drying process, as it allows the paper to pass over heated rolls while facilitating the efficient removal of moisture.

Key features and characteristics of flat yarn dryer fabric include:

1. Construction: The fabric is constructed with flat yarns, which are wider and flatter than traditional round yarns. The flat yarns provide a smooth surface for the paper to pass over, reducing the risk of marking or impression on the paper.

2. Open Area: The fabric has a specific mesh pattern with a controlled open area. The open area allows for sufficient air permeability, enabling efficient moisture removal during the drying process.

3. Material: Flat yarn dryer fabrics are typically made from synthetic materials like polyester or polyamide (Nylon) due to their strength, durability, and resistance to moisture and chemicals.

4. Stability: The fabric is designed to have excellent dimensional stability and strength to withstand the tension and stress encountered during the high-speed paper drying process.

5. Seam Type: Like other forming fabrics, flat yarn dryer fabrics are looped around the paper machine's rolls and joined with a seam to form an endless belt. The seam type used for the fabric depends on the specific requirements of the paper machine and the fabric design.

6. Heat Resistance: The fabric is engineered to withstand the high temperatures in the drying section of the paper machine without degradation.

Flat yarn dryer fabrics are used in various paper grades and machine configurations. They are crucial in ensuring the efficient and uniform drying of the paper, which is essential for achieving the desired paper properties and quality.

Proper maintenance, cleaning, and periodic replacement of flat yarn dryer fabrics are necessary to ensure optimal performance and extend the fabric's lifespan. The choice of dryer fabric and its design depends on factors such as the paper grade, machine speed, production requirements, and other specific needs of the papermaking process.