Filter element and method for the production thereof

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 71/02 (2006.01) B01D 67/00 (2006.01)

Patent

CA 2532103

The invention relates to a method for the production of a filter element, said method comprising the following steps: Sl) a membrane layer (1) is applied to a carrier substrate (2); S2) a membrane chamber (3) is etched onto the side of the carrier substrate (2) which is opposite the membrane layer (1) such that only one residual layer (5) of the carrier substrate (2) remains; S3) pores (6) are produced in the membrane layer (1) in order to produce a perforated membrane; S4) the residual layer (5) is removed by etching in order to expose the membrane layer (1); S5) the membrane layer (1) undergoes an additional treatment in order to increase mechanical resistance, said treatment taking place during step S1 or in a later step. The membrane layer is provided with a crystalline structure having increased mechanical resistance in relation to the base material of the membrane layer (1) and/or a condensed structure and produces due to said treatment, whereby an inner initial stress therein is preferably produced.

Procédé de fabrication d'un élément de filtre, qui consiste (S1) à déposer une couche membrane (1) sur un substrat de support (2), (S2) à former par corrosion une chambre (3) de membrane sur la face du substrat de support (2) opposée à la couche membrane (1), si bien qu'il reste encore une couche résiduelle (5) du substrat de support (2), (S3) à produire des pores (6) dans la couche membrane (1) pour obtenir une membrane perforée, (S4) à éliminer la couche résiduelle (5) par corrosion pour mettre à nu la couche membrane (1), (S5) la couche membrane (1) étant soumise, pendant l'étape S1 ou une étape ultérieure, à un traitement supplémentaire destiné à augmenter sa résistance mécanique, pour lui conférer une structure cristalline possédant une résistance mécanique accrue par rapport à la matière de base de la couche membrane (1) et / ou une structure densifiée et pour produire de préférence en elle une précontrainte mécanique interne.

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