It works differently from the conventional one where the jet of water / paper is launched on a flat table with a screen and where the dewatering occurs increasingly by blades after with an increasing amount of vacuum at the bottom.
In this case, the sheet is formed with the jet entering as a sandwich between a screen and a felt, and most of the water from the jet is expelled through the screen in the short time that the sheet circulates the forming roll., following, accompanying the felt, to the steam press / dryer assembly.
The expulsion of water occurs by the tension of the screen against the paper and below it the forming cylinder, forcing the water to come out.
Compounds of an inbox specially manufactured for this use, a forming roll, roller track structures for conditioning the dryer screen, etc.
Used with a greater emphasis on the formation of sanitary papers, mainly the hygienic. But in lower volume because of lower demand, are also manufactured in crescent former kitchen towel papers, facial scarves, napkin, commercial and industrial towels, towels for medical uses, etc.
Features and Advantages
The use of crescent former for this range of products is so advantageous that machines using a flat table are currently rare.