Crescent Former Tissue Machine For Paper Mill
In the age of heightened focus on energy efficiency, this innovative machine is at the forefront of energy-saving solutions. Through advanced features such as the shoe press, steam generator, improved headbox design, and turbines in the forming section, energy consumption has been drastically reduced.
The process begins with the swift ejection of a water jet containing the fiber stock mixture from the headbox of the Crescent Former. The resulting web is expertly formed by enveloping it between the forming fabric and felt as they encircle a solid forming roll. Initial drainage occurs around this roll, with the wire tension dictating the drainage capacity. The pressure of drainage is intricately defined by the formula P=T/R, where T represents wire tension and R symbolizes forming roll radius.
As the tissue sheet web progresses on the felt, it is eventually transferred to the Yankee in the initial press nip. Usually, a suction roll is employed as the first press roll, boasting a wide suction box for optimal water removal. Dryness of the web escalates to around 25% before entering the press nip, and typically rises to over 40% post-press. The linear load and peak pressure in the nip ensure optimal drying efficiency.
The addition of a second press roll further enhances dryness by 2-4%, albeit with a slight reduction in sheet caliper. Nevertheless, this process typically improves tensile strength. By augmenting the hood wrap for an extended drying area, variations in production output between the single and double press concepts remain marginal.
Most tissue machines are equipped with only a suction press roll, primarily for its enhanced bulk capacity and cost-efficiency. For heightened water removal and improved moisture uniformity, a steam shower over the vacuum zone of the first press roll is occasionally employed. Additionally, an innovative press concept utilizing a shoe press against the Yankee has emerged in recent years. This design allows for enhanced dryness, increased production capacity, and improved bulk formation.
In conclusion, the Crescent Former Tissue Machine stands as a pinnacle of innovation in the tissue production realm. Through its energy-efficient design and advanced functionalities, it epitomizes the perfect blend of technology and sustainability, setting new standards for the industry.
Email address: leizhanworld@gmail.com
