Method for preparing filtering material

Details Method for preparing filtering material Method for preparing filtering material

2008-06-17

2008-06-17

Goff, John L (Department: 1791)

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

C156S324000, C055S485000, C055SDIG007

Reexamination Certificate

active

07387700

ABSTRACT:
A method of manufacturing a filter medium that has a PF value that exceeds 32, the PF value calculated from the pressure loss and the collection efficiency of the filter medium according to the following formula:in-line-formulae description="In-line Formulae" end="lead"?PF=[−log(permeability (%)/100)/(pressure loss (Pa)]×1000[Formula 1]in-line-formulae description="In-line Formulae" end="tail"?in which permeability (%)=100−collection efficiency (%). In this method, 380 ml or more of a liquid lubricant at 20° C. is added per 1 kg of a PTFE fine powder, this compound is processed into a tape shape and elongated to obtain a PTFE porous film, and an air permeable support member is heat laminated to at least one surface of the PTFE porous film.

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ChemicalLand21.com Publication.
O. Tanaka et al., Technical revolution by ultra-high performan PTFE air filter, Proceedings of the 15thICCCS International Symposium, published prior to Apr. 3, 2002, pp. 454-463.

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