Process of producing porous web materials used for making infusi

Details Process of producing porous web materials used for making infusi Process of producing porous web materials used for making infusi

1993-07-01

1995-07-11

Bell, James J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Noninterengaged fiber-containing paper-free web or sheet...

206 05, 426 77, 426 84, 428289, 4283111, 4283117, 4283066, 4283088, 428446, 428449, 428511, B32B 2700

Patent

active

054319978

ABSTRACT:
A porous web material for making infusion packages having enhanced mechanical seam integrity is obtained by treating the entire fibrous web material with an aqueous emulsion of a hydrophobic agent selected from the group consisting of high molecular weight cross-linked acrylic polymers, silicones, fluorohydrocarbons, paraffins, alkyl ketene dimers and stearylated materials. The hydrophobic agent, which may also act as a strength imparting binder, is preferably applied as a saturating treatment. The treated web is subsequently dried to insolublize the agent on the web. The web exhibits no appreciable water climb when measured using water at a temperature of about 100.degree. C. and no substantial loss of infusion characteristics while providing less than 10 percent failure in a mechanical seam therein when exposed to boiling water.

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