Process of producing porous web materials used for making infusion packages for brewing beverages and the web materials thus produced.

摘要

The integrity of mechanical seams in tea bags is enhanced by treating the material used for the tea bag over its entire extent with a latex dispersion of a hydrophobic agent. The infusion characteristics and porosity of the material are not adversely affected as the latex dispersions are absorbed into the fibers of the material. Strength imparting binders, such as alkyl acrylate hydrophobic binders, may be employed as well as silicones, fluorohydrocarbons, paraffin, alkyl ketene dimers and stearylated materials. The binder pick up on the fibrous web material is preferably at least 3-4 percent by weight and may be up to as much as 15-20 percent by weight.