SYSTEM AND METHOD FOR FORMING HYDROPHOBIC STRUCTURES IN A POROUS SUBSTRATE

摘要

An apparatus for distributing a hydrophobic material in a substrate includes a first roll&-, second roller that engages the first roller to form a nip, a heater operatively connected to the first roller and configured to heat the first roller to a first temperature that is greater than a second temperature of the second roller, and a substrate transport configured to move a substrate through the nip at a credete.-rnined velocity. The first roller engages a first side of the substrate and tile second roller engages a second side of the substrate to enable the hydropnobic materia to penetrate into the substrate.