Abstract: A filtering device for a spinning head for producing plastic threads. The spinning head has a housing in which the plastic melt flows through a filter element under pressure before exiting the spinnerets. The filter element is provided with a filtering material that is subjected to an axial contact pressure through a distributor device, according to the degree of pressure of the melt. This contact pressure acts upon the sealing edges of the filter element to close the sealing gaps. The special geometrical configuration of the filter element and/or its elasticity guarantee advantageous filtering in terms of energy. The filtering system is resistant to pressure and provides good, permanent sealing.

Abstract: A process and apparatus for degassing high-boiling liquids, especially polymer melts and solutions, to remove low-boiling liquids and gases as impurities by feeding the polymer melt or similar high-boiling liquid under expansion into the feed chamber of a gear wheel pump to flow downwardly and only partially fill this feed chamber, preferably so as to form a thin layer or pool of the melt atop the upper crown surfaces of the gear wheels. The impurities are withdrawn separately through a suction outlet and the liquid level of the melt is preset and maintained by suitable regulating apparatus adapted to control the speed of the gear wheels and/or the speed at which melt is delivered into the pump feed chamber.