FILTEREINRICHTUNG FÜR STRANGPRESSEN UND SPRITZGIESSMASCHINEN

摘要

A filter device for extruders and injection moulding machines designed to process thermoplastics, comprising filter elements that are fitted in at least two separate ducts of a housing between at least one main admission duct and one main exit duct and are interchangeably mounted in sieve carrier bolts in sieve openings that can be moved inwards and outwards with said sieve carrier bolts in the respective bore hole of the housing. At least one locking mechanism is provided in the vicinity of the main admission duct upstream from the sieve carrier bolts. When in a flow position, the locking mechanism does not impede the flow of plastic from the main admission duct to the filter elements. However, when the locking mechanism is in a locking position, the flow of plastic in a partial admission duct is separated from the main admission duct, whereby a) the filter elements in the sieve carrier bolts are configured in an oval shape in a manner that is known per se, whereby the long axis of the oval extends in the direction of displacement of the sieve carrier bolts and the length of the oval axis of the filter elements in relation to the length of the housing bore hole is selected in such a way that only the length of the sieve carrier bolts required to seal the sieve carrier bolts in the housing bore hole is devoid of filter elements and b) the partial admission ducts for each sieve opening open out into at least two flow ducts.