FILTERS CONSISTING OF FILTER PAPER OR PAPER-TYPE NONWOVEN MATERIAL

FILTERS CONSISTING OF FILTER PAPER OR PAPER-TYPE NONWOVEN MATERIAL

The invention relates to filters consisting of filter paper or paper-type nonwoven material. Said filters consist partially or completely of fibrous material containing cellulose. The aim of the invention is to eliminate the disadvantages of the prior art by providing filters which are characterized...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: PIESCHEL, FRIEDEMANN, KNIELING, MICHAEL, LANGE, ECKEHARD
Format: Patent
Sprache:eng ; fre
Schlagworte:
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
IMPREGNATING OR COATING OF PAPER
METALLURGY
PAPER NOT OTHERWISE PROVIDED FOR
PAPER-MAKING
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D
PRODUCTION OF CELLULOSE
PULP COMPOSITIONS
SEPARATION
TEXTILES
THEIR RELEVANT APPARATUS
TRANSPORTING
TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:The invention relates to filters consisting of filter paper or paper-type nonwoven material. Said filters consist partially or completely of fibrous material containing cellulose. The aim of the invention is to eliminate the disadvantages of the prior art by providing filters which are characterized by an excellent filtering capacity and which are also able to absorb and bind unwanted impurities or accompanying substances in the filter medium. To this end, the cellulose-containing material used for the inventive filter is at least partially carbamided with urea and phosphorylated with phosphoric acid or ammonium phosphate until a nitrogen content in the form of carbamide grou ps of 1 to 4 % and a phosphorous content of 3 to 8 % is reached. The invention also relates to a suitable method for producing the inventive filters.