Apparatus for making melt-blown filter cartridges

US6662842B2 · kind B2 · utility

Assignee

• Pall Corporation · US

Inventors

• Brian Mozelack · White Hall, US
• Robert J. Schmitt · Nottingham, US
• Steven D. Barboza · Baltimore, US
• Praveen Jana · Timonium, US
• Son Nguyen · Richland, US
• Ronald R. Gschwandtner · Mount Airy, US
• Robert D. Connor · Spring Grove, US
• Timothy W. Yingling · Millers, US

Key dates

• Filing date: Aug 30, 2001
• Grant date: Dec 16, 2003
• Expiry date: Mar 7, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/139
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Filter cartridges may have a core element formed of a non-filtering, self-supporting non-woven mass of indefinite length continuous synthetic polymeric core fibers, and at least one annular filtration zone layer formed of a mass of non-woven indefinite length continuous synthetic polymeric filtration fibers. The non-woven core element is most preferably formed in situ during filter cartridge manufacturing by melt-blowing synthetic polymeric core fiber streams toward a forming mandrel. The non-woven core element is completely solidified prior to the filtration zone fibers being melt-blown thereon so that the core and filtration fibers are predominantly mechanically interlocked with one another, instead of being melt-bonded thereto. Filter cartridges of predetermined length may be cut from an upstream filter cartridge preform of indefinite length by subjecting the preform to forced cooling air to thereby minimize (if not eliminate entirely) significant filter cartridge shrinkage over time. In addition, a cutter assembly may be mounted laterally of the preform, but is capable of rate-synchronized longitudinal movement with the preform during its cutting operation.