Twin wire presses

Various types of machines are used for dewatering in stock preparation Drum filters, belt filters, twin wire presses, disk filters, and screw presses, as well as static filters such as inclined and curved screens. They can differ in several aspects such as... 

Like most fabrics, paper has a right and wrong side. The bottom of the web (called the wire side) next to the screening at the wet end of the fourdrinier machine is slightly rougher than the top (or felt) side. If only one side of the p er is to be used, the smoother side is usually chosen. Paper made on a twin-wire fourdrinier machine has either two felt sides or two wire sides this is because two webs of pulp are laid down simultaneously and pressed together as the paper is dried and finished. One-sided paper is more expensive than ordinary two-sided paper. 

Discontinuities in sample application may be caused by dirty applicators in cellulose acetate or inclusion of an air bubble in AGE. In practice, caution must be used in cleaning applicators because they are easily bent. Twin-wire applicators are best cleaned merely by agitating in water followed by gently pressing the applicators against absorbent paper. It is inadvisable to clean wires by manual wiping. The pipette tip should be checked for air bubbles before application of the sample to the agarose gel template. 

---