Arrangement for Forming a Layered Fibrous Mat of Varied Porosity
AssigneeAAF-McQuay Inc.
InventorKyung Choi
Life of this patent
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Abstract
An arrangement for producing a fibrous mat from a heated die source wherein the produced mat includes a first layered, preselected fiber portion of substantially straight fibers produced by directing such fibers directly to a collector source and a second layered preselected fiber portion of substantially curled fibers produced by diverting and exerting an external vortically creative curling force thereon before reaching the collector source.
Claims28
A mat of fibrous filter media comprising a downstream side having at least a first portion of selected fiber diameter and an upstream side having at least a second portion also of selected fiber diameter, said first portion being of substantially aligned fibers of a first selected porosity and said second portion being of substantially curled fibers of a second selected larger porosity than said first portion.
A mat of layered fibrous filter media comprising at least a first downstream layer and a second upstream layer of layered portions of fibers, said portions comprising approximately one third (⅓) and two-thirds (⅔) respectively of the final thickness of said layered fibrous mat with the fibers of both portions being approximately three point five (3.5) microns in diameter and with the fibers of said first portion having been attenuated directly in straight fibers formed from a die source to form comparatively denser, less porous layers of said final fibrous mat and the fibers of said second portion having been diverted and subjected to an external vertically creating force to form the layers of said second portion of mat in curled form with greater porosity than said layers of said first portion.
A layered web of fibrous filter media comprising:
- at least one downstream layer having relatively straight fibers;
- and
- at least one upstream layer having curled fibers wherein said upstream layer has a porosity greater than a porosity of said at least one downstream layer having relatively straight fibers.
A mat of fibrous filter media comprising at least a first portion of selected fiber diameter and at least a second portion also of selected fiber diameter, said first portion being a downstream layer of substantially aligned fibers of a first selected porosity spun from a die source directly to a collector source and said second portion being an upstream layer of substantially curled external vertically creating force treated fibers of a second selected larger porosity than said first portion due to said external vertically creating force treatment before arriving at said collector source to combine with said first portion in forming said mat.
A mat of layered fibrous filter media comprising at least first and second layered portions of fibers, said first layer being adjacent a downstream side of said mat, said second layer being adjacent an upstream side of said mat, said portions comprising approximately one third and two-thirds respectively of the final thickness of said layered fibrous mat with the fibers of both portions being approximately 3.5 microns in diameter and with the fibers of said first portion having been attenuated directly in straight fibers form from a die source to form comparatively denser, less porous layers of said final fibrous mat and the fibers of said second portion having been diverted and subjected to an external vertically creating force to form the layers of said second portion of mat in curled form with greater porosity than said layers of said first portion.
Dependencies are inferred from the claim text.