Process and materials for coiling z-filter media; and/or closing flutes of filter media; and, products
Approaches to providing z-filter media constructions are provided. Preferred corrugated media, filter constructions having such corrugated media, and filter systems using such filter constructions are provided. Also, preferred methods of forming filter constructions are provided.
1. A method of preparing a filter construction for use in an air cleaner; the method comprising steps of:
(a) distorting a generally circular configuration of a fluted media sheet secured to a facing sheet of media to form a resulting oval shaped media configuration having two, opposite, generally parallel sides and two, opposite, curved ends; and,
(b) positioning a housing seal on the resulting oval shaped media configuration.
2. A method according to claim 1 wherein:
(a) the generally circular configuration comprises a coiled strip of fluted filter media sheet secured to facing filter media; the coiled strip resulting from coiling the strip around itself and leaving a central open space.
3. A method according to claim 1 wherein:
(a) the step of distorting comprises distorting the generally circular configuration sufficiently to seal selected portions of the fluted media sheet to one another.
4. A method according to claim 1 wherein:
(a) the step of distorting comprises forming at least six interdigitized flutes along a resulting center strip of the resulting oval shaped media configuration.
5. A method according to claim 1 wherein:
(a) the step of distorting comprises distorting a coiled configuration formed by coiling the filter media on a hub and then removing a resulting generally circular coiled configuration from the hub to provide a coreless coil as the generally circular configuration.
6. A method according to claim 1 wherein:
(a) the step of positioning a housing seal comprises positioning a framework on the oval shaped media configuration and providing a housing seal on the framework.
7. A method according to claim 6 wherein:
(a) the step of positioning a framework includes positioning a framework having a plastic cross piece positioned as a face lattice.
8. A method according to claim 1 wherein:
(a) the housing seal comprises a seal applied directly to the media.
9. A method according to claim 1 wherein:
(a) the housing seal comprises a seal applied directly to the media without added framework.
10. A method according to claim 1 wherein:
(a) the step of distorting includes sealing an open center closed with a sealant that increases in volume during cure.
11. A method according to claim 1 wherein:
(a) the step of distorting includes sealing an open center closed with a polyurethane sealant that increases in volume during cure.
12. A method according to claim 1 wherein:
(a) the step of distorting includes sealing an open center closed with a polyurethane sealant that increases in volume by at least 40% during cure.
13. A method according to claim 1 wherein:
(a) the step of positioning a housing seal includes providing a foamed polyurethane housing seal gasket secured to the outer surface of the media construction.