Norddeutsche Seekabelwerke Aktiengesellschaft

Norddeutsche Seekabelwerke Gmbh

Hans-Joachim Bittner

Hartwig Basse

Contact-filter block (10) for the construction of trickling filters or rotating disc filters such as those used for the biological treatment of waste waters. The tube sections (11) of which the contact-filter block (10) is made up have an outside surface (12) structured in a net-like manner, the outside surfaces of the tube sections (11) being joined by joints (13) to avoid constrictions in the clear cross section of the tube sections (11).

Contact filter block of joined tube sections

Disclosed is a net (10), especially a spacing net, surface protection net or the like, in which the strands (14, 15, 16) are arranged in three planes (11, 12, 13), and in which the strands (15, 16) of two planes (11, 13) are oriented equidirectionally. As a result, a sufficient thickness of the net (10) can be ensured with a small cross section of the individual strands (14, 15, 16), which keeps the expenditure of material down to a minimum. Because the parallel strands (outer strands 15, 16) of the different outer planes (11, 13) are offset to one another in the direction of the inner strands (14), the intermediate strands (inner strands 14) can be deformed elastically, which results in very good padding properties and thickness variation properties of the net (10).

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Brake, Germany

Hans-Joachim Bittner