FILTER FÜR AUFGUSSGETRÄNKE, INSBESONDERE KAFFEEFILTER, UND VERFAHREN ZUR HERSTELLUNG EINES DERARTIGEN FILTERS

摘要

The filter (1) is made of fibrous material with pores (5) with an average pore width (d) of between 0.1 and 0.7, preferably 0.6, millimetres measured with a fibre density amounting to roughly 50% of the original or average fibre density of the material. The pores are produced by needles on rollers, or by water jets. The pores form a perforation (4) along which the filter can be separated to reduce its size.