Disclosed is a filter arrangement comprising: a first body, into which an inlet of the first container for containing liquid is inserted and coupled together in a sealing manner, the first body including an inlet, an outlet and a lower face formed on the outlet; a second body, into which an inlet of the second container is inserted and coupled together in a sealing manner, the second body including an inlet, an outlet and an upper face formed on the inlet; a passage fluidly connecting the inlet of the first body, the outlet of the first body, the inlet of the second body and the outlet of the second body; a filter provided on the lower face of the first body and the upper face of the second body; and a plurality of raised bumps provided between the filter and the upper face of the second body.

The invention relates to an arrangement for detecting a damage of a filter fabric (8) of a disc filter (1) at a disc filter unit comprising disc filters. The arrangement comprises a measurement bar (20) comprising two or more microphones (21), a store (45) including stored sound samples, at least one alarming means and a processing arrange-ment (43) for analyzing online sound or sound samples captured by the microphones (21). The processing arrangement (43) is connected to the microphones (21), the store (45) and the at least one alarming means. The invention also relates to a method for detecting a damage of a filter fabric (8) of a disc filter (1) at a disc filter unit.

The invention provides a vacuum cleaner filter bag comprising a wall of an air-permeable material enclosing an interior and an inlet opening introduced into the wall, wherein the air-permeable material comprises at least one layer of a nonwoven fabric, which comprises powdery and/or fibrous recycled material from the production of textiles, in particular cotton textiles, wherein the at least one layer of the nonwoven fabric comprises powdery and/or fibrous recycled material having a density of 0.005 g/cm.sup.3 to 0.03 g/cm.sup.3, in particular of 0.007 g/cm.sup.3 to 0.02 g/cm.sup.3.

Disclosed are a blood filter which exhibits excellent leukocyte elimination performance as well as significantly improved blood throughput per unit time and erythrocyte recovery rate and a method of manufacturing the same. The blood filter of the present invention includes a pre-treatment filter which is a laminate of first non-woven fabrics having a mean fiber diameter of 5 to 30 ?m and a mean pore size of 10 to 30 ?m, and a main filter which is a laminate of second non-woven fabrics having a mean fiber diameter of 1 to 5 ?m, a mean pore size of 5 to 10 ?m and a mean pore size distribution rate of 30% or more. A filling density of the pre-treatment filter and a filling density of the main filter, with respect to a target blood throughput of the blood filter, are 0.1 g/100 ml to 1 g/100 ml and 1 g/100 ml to 3 g/100 ml, respectively.

The invention relates to a vacuum-cleaner filter bag comprising a wall made of an air permeable material and surrounding an inner chamber, and an inlet opening introduced into the wall. The vacuum-cleaner filter bag is characterized in that the air permeable material comprises at least one layer made from a non-woven fabric and/or a layer made from a fiber web which comprises fibers or is made from fibers which are made from a recycled plastic or a plurality of recycled plastics.

The invention provides a vacuum cleaner filter bag, comprising a wall enclosing an interior and made of an air-permeable material and an inlet opening introduced into the wall, characterized in that the air-permeable material comprises at least one layer of a nonwoven fabric which comprises powdery and/or fibrous recycled material from the production of textiles, in particular cotton textiles, and/or from wool shearing and/or seed fibers.

The invention provides a vacuum cleaner filter bag comprising a wall of an air-permeable material enclosing an interior and an inlet opening introduced into the wall, wherein the air-permeable material comprises at least one layer of a nonwoven fabric, which comprises powdery and/or fibrous recycled material from the production of textiles, in particular cotton textiles, wherein the at least one layer of the nonwoven fabric comprises powdery and/or fibrous recycled material having a density of 0.005 g/cm.sup.3 to 0.03 g/cm.sup.3, in particular of 0.007 g/cm.sup.3 to 0.02 g/cm.sup.3.

Method for preparing a catalytic fabric filter comprising the steps of a) providing a fabric filter substrate, preferably consisting of glass fibers, having a gas inlet surface and a gas outlet surface, the gas inlet surface is coated with a polymeric membrane, preferably consisting of polytetrafluoroethylene; b) providing an aqueous impregnation liquid comprising one or more catalyst metal precursor compounds; c) impregnating the fabric filter substrate with the impregnation liquid; and d) drying and thermally activating the impregnated fabric filter substrate at a temperature below 300 C. to convert the one or more metal compounds of the catalyst precursor to their catalytically active form, wherein the drying of the impregnated fabric filter substrate in step d) is performed from the gas outlet surface.

A smoke filter includes a housing formed with an upper casing and a lower casing. A filtration passage with a bending section is formed between the upper casing and the lower casing and further, a replaceable filtration cloth device is provided in the interior of the housing and the filtration cloth of the replaceable filtration device passes through the filtration passage. By so designing, the smoke filter of this invention is able to increase a filtration area, enhance filtration efficiency and diminish the size of the housing and further, the smoke filter of this invention is simple in structure and convenient in maintenance and in replacement of the filtration cloth.

A smoke filter includes a housing formed with an upper casing and a lower casing. A filtration passage with a bending section is formed between the upper casing and the lower casing and further, a replaceable filtration cloth device is provided in the interior of the housing and the filtration cloth of the replaceable filtration device passes through the filtration passage. By so designing, the smoke filter of this invention is able to increase a filtration area, enhance filtration efficiency and diminish the size of the housing and further, the smoke filter of this invention is simple in structure and convenient in maintenance and in replacement of the filtration cloth.