Back to results
US 2001/0036890 A1Published application
Pleated fluid filter medium method
AssigneeAAF International
InventorsKyung-Ju Choi, Dennis R. Porter, Ronald E. Braswell
Life of this patent
Estimating the term…
Abstract
A self supporting pleated fluid filter medium having different fibers to provide pleats sufficiently self supporting to maintain pleated form during fluid filter treatment, the invention further including low melt fiber and an optional support frame and a method of making such pleated filter.
Claims27
A self supporting pleated fluid filter medium, comprising:
- a blend by weight of preselected different fibers at least one of which is of preselected low melt fiber material with a portion of low melt fiber material melted into said blend, said blend having at least a sufficient stiffness to provide for self supporting pleats sufficient to maintain pleat form during an anticipated fluid filtering treatment velocity.
A self supporting air filter medium comprising:
- a blend by weight of preselected fibers comprises approximately five (5) to fifty (50) percent (%) six (6) denier fibers, zero (0) to forty (40) percent (%) one (1) denier fibers, and thirty (30) to ninety five (95) percent (%) preselected low melt fibers having the downstream side of the filter medium blend with a slightly greater concentration of smaller size fibers, wherein said filter medium blend has a Gurley stiffness along any direction of medium in the approximate Gurley stiffness range of four hundred (400) to sixteen hundred (1600) milligrams.
A filter frame member comprising:
- a flat body member having an inner perimeter defining a flow-through passage to receive a passage covering pleated filter medium in sealed relation therewith, said body member including pleat support members extending therefrom to engage in supporting relation along only the side faces of said pleated filter medium in spaced relation from the crests of said pleated filter medium.
A filter frame member comprising:
- a flat substantially rectangular border body member having an inner perimeter defining a substantially rectangular flow through passage to receive a passage covering pleated filter medium in sealed relation therewith;
- said body member including at least one spaced strip of a pleated support member extending from said inner perimeter thereof, said strip having tips shaped to conform with the side flanks along one face of said pleated filter medium to be spaced from the crests thereof.
A method of forming fibrous filter medium comprising:
- selecting and disposing in a supply zone a roll of fibrous filter medium composed of a blend of preselected fibers including a preselected portion of low melt fibers with said low melt fibers being capable of softening at a preselected temperature to provide a filter medium blend of sufficient stiffness to provide for self supporting pleats capable of maintaining pleated form during an anticipated fluid filtering treatment velocity;
- feeding said filter medium at a preselected velocity from said roll in said supply zone through a scoring zone to apply rows of spaced pleat crest score lines thereon;
- feeding said filter medium at a preselected lower velocity to a pleating zone, said lower velocity being sufficiently different to allow said filter medium to fold into pleats along said score lines;
- and, heat treating said pleated filter medium at a preselected low melt temperature.
1 more element
A method of forming fibrous filter medium comprising:
- selecting and dispensing in a supply zone a roll of fibrous filter medium composed of a blend of preselected fibers having a Gurley stiffness of four hundred (400) to sixteen hundred (1600) milligrams and approximately five (5) to fifty (50) percent (%) six (6) denier fibers, zero (0) to forty (40) percent (%) one (1) denier fibers, and thirty (30) to ninety five (95) percent (%) preselected low melt fibers having the downstream side of said blended filter medium with a slightly greater concentration of smaller size fibers, feeding said preselected filter medium at a preselected velocity to a scoring zone to apply rows of transversely spaced pleat crest score lines thereon;
- feeding said filter medium at a preselected lower feed velocity to a pleating zone, said lower feed velocity being sufficiently different to allow said scored filter medium to fold into pleats along said score lines, and heat treating said pleated filter medium at a preselected temperature;
- feeding said pleated filter medium to a pleat shearing zone to sever said pleats into preselected pleated filter medium units;
- said heat treating of said pleats being of sufficient temperatures to soften low melt fibers of approximately two hundred (200) degrees Fahrenheit (F.°) within said pleating and pleat shearing zones.
1 more element
Dependencies are inferred from the claim text.