wet wipe products are made from continuous wet wiping web material having thermoplastic fibers of type , concentration and dispersion capable of being heat - set to set the overall web material in a reformed shape . a succession of ridges and grooves is formed by passing the performed material through a dry creper apparatus in absence of adhesives , the action characterized by pressing the material with a stationary pressing surface to engage an advancing drive surface , the driven material bodily collapsing into a succession of adjacent ridges and grooves that increase the volume of the material . the wet wiping material is heat set in the ridge and groove configuration , enabling the ridge and groove configuration to be preserved when the wet wiping material is wetted and when squeezed and released . the self - restoring ridge and groove configuration provides stress concentrating edges and improves liquid delivery and wet wiping in a number of respects .