FILTER DEVICE
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United States of America Patent
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Issued Date -
Oct 13, 2016
app pub date -
Sep 29, 2014
filing date -
Oct 4, 2013
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Abstract
The invention relates to a filter device for polymer melts, having a filter screen (1), through which the polymer melt to be purified is guided, wherein the filter device comprises at least one scraping element (2), which glides across the upstream surface (4) of the filter screen (1) with its scraping edge (3), or rests on the surface (4) with its end area nearest the scraping edge (3), and lifts off and/or scrapes off the contaminations (6) adhering to the surface (4) and those present in front of the screen orifices (5) in the course of its movement across the surface (4). According to the invention it is provided that the scraping element (2) is embodied in the shape of a disk, in particular comprising parallel, preferably plane large surfaces, i.e. a back face (8) and a front face (9) and is disposed at an inclined pitch (A) of 5 to 60°, preferably 10 to 45°, in particular 20 to 35° toward the surface (4) of the filter screen (1).
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