Gas separation – Flexible or collapsible bag type – With securing or supporting means
Patent
1997-01-30
1998-05-19
Smith, Duane S.
Gas separation
Flexible or collapsible bag type
With securing or supporting means
55381, 55382, 55DIG5, 156204, 156227, 1563084, 156311, B01D 4602
Patent
active
057530017
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention is concerned with a filter unit having at least one passage but preferably a plurality of passages defined by fluid permeable wall portions though which fluid, for example air, to be filtered can pass and be drawn off along the passage or passages but which prevent the passage therethrough of particulate material and/or other debris carried by the fluid. Co-pending European Patent Applications numbers EP0515045A1 and EP0549105A1 are both concerned with such filter units and their manufacture and in particular self-supporting filters units which are particularly suitable for filtering of air in dust filters but may be used for filtering other fluid materials.
BACKGROUND OF THE INVENTION
In the filter units described in EP0515045A1, the passage or passages of the filter units are opened at one end and closed at the other. Mounting means is conveniently provided adjacent the open end of the passages by an outward flange which is formed integral with the wall portions of the passages into which flange the open ends of the passages open. In a preferred filter unit an additional portion of material may be secured to the flange for reinforcing it, this reinforcing material being of the same material as the flange and secured to the flange prior to treatment for rendering the flange rigid. In the aforementioned two European patent specifications, processes are described for forming filter units of various fiber materials and similar processes as described in detail in these two co-pending applications can be used to form filter units in accordance with the present invention.
An alternative example of a prior filter unit is given in DE-2458030. A filter unit is described having reinforcing members at mounting end in order to improve location resiliance of the filter unit in its mounting. These reinforcing members are secured about the open aperture of the filter and are generally rigid elements. Thus, combination of possibly flexible filter material with these rigid elements creates problems with regard to secure location and usually bulk about the filter mounting.
One of the various objects of the present invention is to provide a filter unit having an improved mounting portion.
Another of the various objects of the present invention is to provide an improved process for manufacturing a filter unit with a mounting portion.
SUMMARY OF THE INVENTION
In one aspect, the invention may be considered to provide a filter unit having at least one passage defined by wall portions of air-permeable fiber fabric, said passage being configured to prevent passage of dust and/or debris in a fluid flow drawn therethrough, said passage being closed at one end and at the other end there being an integral filter mounting portion to enable the filter unit to be incorporated in a filter assembly, said mounting portion including a first reinforcing portion arranged and secured about said wall portions of said passage, at least some of said first reinforcing portion and said wall portions secured therewith being arranged to be outwardly flanged to form an outward flange and said mounting portion further includes a second reinforcing portion positioned adjacent said outward flange and bonded thereto, said first and second reinforcing portion having an aperture formed therein to correspond to the open end of the passage.
In another aspect the invention may be considered to provide a process for manufacture of a filter comprising: fiber fabric; former member in the passage, positioning a first reinforcing fiber fabric layer around said open portion such that at least parts of the first reinforcing fiber layer and the wall portions extend beyond the first presser means, pressing the first reinforcing fiber layer against said wall portions extending beyond the first presser means to bend said first reinforcing layer and said portions extending beyond the first presser means outwardly, positioning a second reinforcing layer in alignment and adjacent with the bent outwardly projecting parts of said p
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patent: 4802900 (1989-02-01), Ball et al.
patent: 5246474 (1993-09-01), Greatorex
patent: 5643451 (1997-07-01), Harris et al.
Smith Duane S.
Texin UK Limited
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