Screen drum for drying permeable webs of goods
OwnerGerold Fleissnerinventor
Life of this patent
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Abstract
Each screen drum design has, in front of the rotating screen drum which transports the web, a stationary screen cover whose purpose is retention of the dry air coming from the fan, uniform throughput of the air through the screen cover, and a uniform drying process over the width of the web. The screen cover has a perforation whose permeability is adapted to the degree of drying. At the beginning of the drying process, when the web is not yet very permeably, the screen cover is to be perforated provided a smaller free air throughput surface and, as the degree of dryness increases, a larger free air throughput surface by making the holes larger in diameter or provided a larger number of holes per unit surface.
Claims9
Device for drying permeable webs of goods transported in a transport direction, comprising a housing having at least one rotatably mounted screen drum with a corresponding pumping device at the front end which suctions off the gaseous drying medium from the inside of the screen drum and adds it back to the screen drum from the outside, said screen drum being associated with, on the outside, a stationary screen cover or a fixed cylindrical, screen-like body for equalizing the flow of the oncoming drying medium, characterized in that screen cover over its length in the housing viewed in the transport direction of the goods, is provided with perforations whose open spaces per unit area increase as the degree of dryness of the goods to be dried increases.
Dependencies are inferred from the claim text.