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US 5,928,396 AGranted
Pocket filter and method and apparatus for making the same
AssigneeAAF International
InventorKyung-Ju Choi
Life of this patent
Estimating the term…
Abstract
A filter bag assembly and method and machinery to form the same wherein spaced opposed filter bag panels are connected together by transversely extending preselectively sized binder strips fastened selectively at opposed ends to the spaced filter panels to restrain outward inflation of the filter bag.
Claims24
A fluid filter assembly for removing particulate contaminants from a contaminant laden fluid stream comprising:
- a sheath filter bag including a pair of longitudinally extending fluid pervious filter panels positioned in spaced opposed relation to form filter bag sides therebetween, said filter bag formed with said opposed spaced filter panels including an open upstream end and a spaced downstream end, said opposed longitudinally extending fluid pervious filter panels being connected together by binder means in strip form with a body portion arranged to extend transversely between said longitudinally extending spaced opposed filter panels and fastened on opposite ends of said body portion to said opposed panels, said strip form body portion being of preselective transverse breadth between opposed filter panels serving to restrain outward inflation of said opposed filter panels of said sheath filter bag so as to provide minimal interference with a fluid stream passing through said filter panels of said filter bag.
A fluid filter assembly for removing particulate contaminants from a contaminant laden gas stream comprising:
- a sheath filter bag including a pair of longitudinally extending fluid pervious filter panels positioned in spaced opposed relation to form filter bag sides therebetween, said filter bag formed with said opposed filter panels including an open upstream end and a spaced downstream end, said spaced opposed longitudinally extending fluid pervious filter panels being connected together by spaced parallel rows of continuous longitudinally extending flexible tapes, each of said tapes being of fusible filter material and including spaced body portions intermittently and sonically fused at opposite body portion ends in staggered, successively linear off set relation to spaced opposed facing panels with corresponding body portions of each strip-like member being in agreement in size and geometry and with said body portions of spaced adjacent tapes decreasing successively in breadth between said opposed filter panels from said upstream end of said filter bag toward said downstream end of said filter bag whereby said spaced opposed filter panels of said sheath filter bag form a filter bag with an overall inwardly tapering shape when inflated by a fluid stream to be treated, the side and downstream edges of said opposed filter panels of said filter bag being sealed by fusion.
A method of forming a fluid filter assembly comprising:
- continuously feeding pre-selectively sized spaced sheets of filter media from a media supply zone;
- guiding said sheets of filter media in spaced opposed filter panel filter bag forming relation to a fastening zone;
- continuously feeding at least one preselectively sized strip fastening member between said spaced opposed filter panels;
- and fastening said strip fastening member to said opposed filter panels to provide at least one transversely extendible body portion therebetween to limit inflation of said filter bag formed by said spaced filter panels;
- and sealing at least the side edges of said spaced, opposed filter panels of said filter bag.
2 more elements
A method of forming a fluid filter assembly comprising:
- continuously feeding preselectively sized sheets of fusible filter media from spaced supply zones and guiding said filter media sheets in spaced opposed filter panel filter bag forming relation to a fastening zone;
- continuously feeding a plurality of preselectively spaced tapes of fusible filter material between said spaced, opposed filter panels to said fastening zone;
- sonically fusing said tapes intermediate said filter panels in longitudinally extending relation to said opposed filter panels to provide a plurality of spaced transversely extending tape body portions, each tape being successively sonically fused to spaced opposed filter panels in successively offset and staggered relation and being preselectively of corresponding and successively decreasing transverse breadth from the upstream toward the downstream end of said spaced opposed filter bag filter panels;
- sonically sealing at least opposed side edges of said spaced opposed panels of filter bag;
- and, separating said fluid filter assembly in filter bag form from said continuously fed sheets and sonically fused fastening members.
2 more elements
A filter bag forming machine comprising:
- filter medium support and guide means positioned to feed and guide filter medium from a supply source in filter bag forming spaced opposed filter panels to a fastening means;
- a tape support means positioned to feed filter fastening tape between opposed inner faces of said filter panels to said fastening means;
- said fastening means including cooperative anvil and anvil striker means one of which anvil and striker means is positionable intermediate said opposed inner faces and the other of which is cooperatively positionable along the outer faces of said filter panels wherein said anvil and anvil striker means can cooperatively fasten said tape at preselective locations to said opposed inner faces of said spaced filter panels with a body portion extending therebetween to restrain outward inflation of a formed sheath like filter bag which includes said opposed filter panels.
Dependencies are inferred from the claim text.