Pleated filter media having a continuous bead of adhesive betwee

Details Pleated filter media having a continuous bead of adhesive betwee Pleated filter media having a continuous bead of adhesive betwee

1991-05-17

1993-08-31

Burr, Edgar S.

Gas separation

Means within gas stream for conducting concentrate to collector

55487, 55521, 55528, 55DIG33, 12820612, 12820617, 156291, A62B 1808, A62B 1900, A62B 710, A62B 2302

Patent

active

052404790

ABSTRACT:
A pleatable filter media, suitable for a use in a respirator for humans, is disclosed comprising a filter material including a meltblown polymeric material, such as polypropylene. A laminate construction is disclosed for the filter material comprising a plurality of layers of the meltblown polypropylene laminated together with adhesive. The filter media is preferably glassless. Protective layers enclose the layers of meltblown polypropylene. Methods of manufacture of pleated material are disclosed wherein the adhesive between the layers is extruded in a particular pattern to provide increased stiffness in the machine direction of the pleated filter media. Methods of manufacture are also disclosed wherein the filter media is pleated before the adhesive has cured, and the adhesive is then permitted to cure while the filter media is maintained in the pleated state. Methods of manufacture are also disclosed wherein the filter media is heated, and possibly compressed, after pleating to help form stiffer pleats and sharper pleat tips.

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